KR102614605B1 - Liquefied gas storage tank and vessel comprising the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. The liquefied gas storage tank of the present invention is a storage space disposed at a corner where the first and second surfaces at different angles meet to accommodate the liquefied gas. A liquefied gas storage tank including a corner block forming a , wherein the corner block includes: a lower block provided on the inside of the first and second surfaces and made of a single board; An integrated upper block made of a single board and bonded to the secondary barrier of the lower block; An upper connection block bonded to the secondary barrier exposed between the integrated upper blocks disposed adjacently; And a barrier fixing member installed on the upper surface of the integrated upper block and fixing the primary barrier, wherein the integrated upper block is provided on the inside of the first surface and the second surface and bonded to the secondary barrier. 1 outer primary plywood; One corner primary insulation material laminated on the outer primary plywood; and one inner primary plywood laminated on the corner primary insulation material, wherein the barrier fixing member includes a plurality of unit barrier fixing members installed side by side adjacent to each other on one inner primary plywood. It can be done.

Description

Liquefied gas storage tank and vessel comprising the same}

The present invention relates to a liquefied gas storage tank and a ship including the same.

With recent technological developments, liquefied gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) are widely used to replace gasoline or diesel.

In addition, within vessels such as LNG carriers, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), and LNG FSRU (Floating Storage and Regasification Unit) that transport or store liquefied gas such as LNG at sea. A storage tank (so-called "cargo hold") is installed to store LNG in a cryogenic liquid state.

In addition, liquefied gas storage tanks can generate boil-off gas (BOG) due to heat intrusion from the outside, and the natural evaporation rate (BOR), which is the vaporization rate of boil-off gas, can be increased through insulation design. Lowering is a key technology in liquefied gas storage tank design. Additionally, since liquefied gas storage tanks are exposed to various loads such as sloshing, it may be essential to secure the mechanical strength of the insulation panel.

Considering this, it not only secures the mechanical strength of the insulation panel even at right-angled or obtuse-angled corners in the liquefied gas storage tank, but also improves the insulation performance, and prevents damage caused by various loads such as sloshing, hull deformation, and temperature changes. Research is being actively conducted to reduce stress.

The present invention was created to solve the problems of the prior art as described above, and the purpose of the present invention is to improve the structure of the corner block to reduce the low temperature burden, sloshing burden, and stress burden of the corner secondary barrier. To provide a liquefied gas storage tank and a ship containing the same.

The liquefied gas storage tank according to one aspect of the present invention is a liquefied gas storage tank including a corner block disposed at a corner where the first and second surfaces at different angles meet to form a storage space for accommodating the liquefied gas. As, the corner block includes a lower block provided on the inside of the first and second surfaces and made of a single board; An integrated upper block made of a single board and bonded to the secondary barrier of the lower block; An upper connection block bonded to the secondary barrier exposed between the integrated upper blocks disposed adjacently; And a barrier fixing member installed on the upper surface of the integrated upper block and fixing the primary barrier, wherein the integrated upper block is provided on the inside of the first surface and the second surface and bonded to the secondary barrier. 1 outer primary plywood; One corner primary insulation material laminated on the outer primary plywood; and one inner primary plywood laminated on the corner primary insulation material, wherein the barrier fixing member includes a plurality of unit barrier fixing members installed side by side adjacent to each other on one inner primary plywood. It can be done.

Specifically, each of the plurality of unit barrier fixing members may be arranged at intervals taking into account the contraction and expansion stresses of one corner primary insulation wall, and may be coupled to the corner primary insulation wall by bolting.

Specifically, the integrated upper block includes a plurality of upper slits formed at a certain depth at the top, and the plurality of upper slits may be formed at a depth corresponding to a thickness of less than half of the thickness of the integrated upper block. there is.

Specifically, the plurality of upper slits may be formed through the inner primary plywood to at least a portion of the corner primary insulation to prepare for contraction or expansion stress of the corner primary insulation.

Specifically, the plurality of upper slits may be formed at corresponding positions between the plurality of unit barrier fixing members so that the plurality of unit barrier fixing members are linked to contraction or expansion of the corner primary insulation material.

Specifically, the integrated upper block includes a plurality of lower slits formed at a certain depth at the bottom, and the plurality of lower slits may be formed at a depth corresponding to a thickness of less than half of the thickness of the integrated upper block. there is.

Specifically, the plurality of lower slits may be formed through the outer primary plywood to at least a portion of the corner primary insulation to prepare for contraction or expansion stress of the corner primary insulation.

Specifically, the integrated upper block includes a plurality of upper slits formed at a certain depth at the upper portion; and a plurality of lower slits formed at a certain depth in the lower portion, wherein the plurality of upper slits and the plurality of lower slits may be formed at positions crossing each other.

Specifically, the outer primary plywood has a plurality of first grooves formed on the lower surface bonded to the secondary barrier, and the plurality of first grooves allow the outer primary plywood to be positioned on the secondary barrier. When bonded with an adhesive, it may be formed in a direction perpendicular to the corner side of the storage tank to ensure that the adhesive is squeezed out into the non-bonded area.

Specifically, a plurality of non-adhesive areas are set in the middle portion, including both edge portions of the outer primary plywood, and each of the plurality of non-adhesive areas is spaced at a certain distance perpendicular to the corner side of the storage tank. and width, and may be set to corresponding positions between the plurality of unit barrier fixing members.

Specifically, the plurality of first grooves may be formed along border portions on both sides of the plurality of non-adhesive areas and may be arranged to alternate with the plurality of upper slits.

The liquefied gas storage tank and the ship equipped with the same according to the present invention can reduce the low temperature burden, sloshing burden, and stress burden of the corner secondary barrier by improving the structure of the corner block.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention, the inner first and second fixing parts for holding the barrier fixing member to which the corner primary barrier is fixed in the corner block are not made of plywood but polyurethane. By forming it in a combination with foam insulation, insulation performance can be improved, weight can be reduced, and costs can be reduced compared to existing plywood alone.

In addition, the liquefied gas storage tank according to the present invention and the ship equipped with the same have a corner primary insulation wall of the corner block connected to the flat primary insulation wall of the flat block and corner 2 of the corner block connected to the flat secondary insulation wall of the flat block. By configuring the thickness of the insulation wall to be the same or similar, the thickness of the corner primary insulation wall becomes relatively thicker than before (however, the thickness of the corner secondary insulation wall is a thickness that can maintain mechanical strength at a certain level), so corner 2 It can reduce the low-temperature burden and sloshing burden on the secondary barrier, prevent damage to the corner secondary barrier, and prevent brittle fracture of the hull by reducing the low-temperature burden on the corner secondary barrier.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention have a relatively thick corner primary insulation wall compared to the existing one, thereby increasing the length of the portion where the corner secondary barrier is not bonded to the corner secondary insulation wall. By increasing the flexibility of the corner secondary barrier, not only can the probability of damage to the corner secondary barrier, including the corner connection barrier, be further reduced, but the corner secondary barrier also becomes easier to absorb hull deformation and maintains low temperature Stress can also be reduced further.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention are spaced at a certain distance between the first inner fixing part and the second inner fixing part provided on the inside of the first and second surfaces at different angles, respectively. By providing an inner intermediate fixing part between the first and second inner fixing parts, the bending angle of the corner primary barrier can be alleviated by the inner intermediate fixing part, thereby reducing the sloshing burden on the corner primary barrier. In addition, the mechanical strength of the corner part can be increased.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a chamfer at the corner where the outer first fixing part and the outer second fixing part, which are respectively fixed to the first and second surfaces at different angles, face each other. And by filling the chamfer with low-density polyurethane foam, the insulation performance can be further increased at the corners by the low-density polyurethane foam.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a step at the corner where the outer first fixing part and the outer second fixing part, which are respectively fixed to the first and second surfaces at different angles, face each other. And, by filling the step portion with glass wool, the flexibility of the corner secondary barrier including the corner connection barrier formed on the upper part of the glass wool is improved, thereby further preventing damage to the corner secondary barrier.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention are spaced at a certain distance between the outer first fixing part and the outer second fixing part, which are respectively fixed to the first and second surfaces at different angles, By providing an outer intermediate fixing part between the first and second outer fixing parts, the gap formed between the first outer fixing part and the outer intermediate fixing part and between the second outer fixing part and the outer intermediate fixing part, Damage to the corner secondary barrier fixed to the outer fixture can be prevented by alleviating the contraction or expansion stress caused by the temperature of the outer fixture compared to the gap.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a chamfer at the corner where the outer first fixing part and the outer second fixing part, which are respectively fixed to the first and second surfaces at different angles, face each other. In addition, by installing corner secondary barriers along the surfaces of the first and second outer fixing parts including the chamfer portion, the corner secondary barriers protrude and bend outward, increasing the length of the non-adhered portion to the corner secondary insulation wall. , due to the increased flexibility of the corner secondary barrier, not only can the probability of damage to the corner secondary barrier, including the corner connection barrier, be further reduced, but the corner secondary barrier also becomes easier to absorb hull deformation and further reduces low-temperature stress. It can be.

In addition, in the liquefied gas storage tank according to the present invention and the ship equipped with the same, a plurality of corner primary insulation walls including inner primary plywood forming a step with the corner primary insulation are arranged on the corner secondary insulation walls, but adjacent By configuring the corner primary insulation materials to be arranged adjacently, not only does it facilitate the installation and handling of the barrier fixing member through the step portion between the inner primary plywood disposed adjacently, but also the packing material only needs to be seated in the step portion. Consumption of packing materials can be reduced.

In addition, the liquefied gas storage tank according to the present invention and the ship equipped with the same have an inner first half-bended portion bonded to the inner first fixing portion of the corner primary insulation wall and bonded to the inner second fixing portion. It is composed of an inner second half bend, and the space between the inner first and second half bends is closed with a corner inner packing material with a positive tolerance, thereby blocking the heat convection path at the inner bend, preventing the heat convection phenomenon. It can be prevented.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention, the size of the inner bend (or corner connection bend) of the corner primary insulation wall is the first inside of the corner primary insulation wall (or corner connection insulation wall). , By reducing it to about half the size of the second fixing part (or the first and second corner connection fixing parts), the area reduced due to temperature changes is reduced compared to the existing inner bent part formed at the same height as the inner first and second fixing parts. Accordingly, the space where thermal convection occurs at the inner bend (or corner connection bend) (non-adhesion area between the inner bend and the secondary barrier at the corner) is reduced, thereby reducing the thermal convection phenomenon.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention, the size of the inner bend (or corner connection bend) of the corner primary insulation wall is the first inside of the corner primary insulation wall (or corner connection insulation wall). ,The space created between the remaining half of the inner first and second fixing parts (or the first and second corner connecting fixing parts) is reduced by about half compared to the size of the second fixing part (or the corner first and second connecting fixing parts). The part is finished with corner inner packing material, but the corner inner packing material is inserted into the inside of the inner bend (or corner joint bend) to a certain depth, thereby further reducing the thermal convection phenomenon at the inner bend (or corner joint bend). can do.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention constitute an integrated upper block in which a plurality of unit upper blocks are integrated into one compared to the existing upper block in which a plurality of unit upper blocks are arranged side by side adjacent to each other. By doing so, the thermal convection path occurring between the existing unit upper blocks is omitted, thereby reducing the thermal convection phenomenon.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention have a structure in which both sides of the inner bend of a reduced size and the corner connection bend of a reduced size protrude, and the upper part between adjacent integrated upper blocks When the connection block is installed, the space created by the protruding structure of the inner bend and the corner connection bend is closed with a stuffing piece, so that the thermal convection path generated between the integrated upper block and the upper connection block has a protruding structure and stuffing piece. By forming a curved path, the thermal convection phenomenon can be reduced.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention install a plurality of unit barrier fixing members on the upper surface of the portion corresponding to each of the plurality of unit upper blocks forming the existing upper block in the integrated upper block, and , an upper slit of a certain depth is formed in the upper part of the integrated upper block exposed between a plurality of unit barrier fixing members, and a lower slit of a certain depth is formed in the lower part of the integrated upper block so as to intersect with the upper slit, thereby integrating the upper and lower slits. The contraction and expansion stress of the upper block can be alleviated. In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a plurality of first grooves in a direction perpendicular to the corner side of the storage tank on the outer primary plywood of the integrated upper block connected to the corner secondary barrier. However, by forming the parts adjacent to both edges of the outer primary plywood and the border parts on both sides of the non-bonded area set in plural in the middle part, bonding defects of the integrated upper block, which has a large bonding area compared to the existing upper block, are prevented. It can be prevented.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a plurality of first grooves in the outer primary plywood of the integrated upper block, thereby bonding the outer primary plywood to the secondary barrier with adhesive. When bonding, it is possible to ensure that the adhesive is squeezed out into the non-adhesive area and prevent the adhesive from excessively penetrating into the non-adhesive area.

In addition, the liquefied gas storage tank and the ship equipped with the same according to the present invention form a second groove in the corner second connection plywood of the upper connection block connected to the corner connection barrier in a direction horizontal to the corner side of the storage tank, By forming the corner second connection in the area adjacent to the rear edge of the plywood, not only can it be visually confirmed that the adhesive in the adhesive area is squeezed out into the non-adhesive area, but also the adhesive is squeezed out beyond the second groove and becomes non-adhesive. As the section is bonded, the non-bonded section of the corner is reduced, preventing the load applied to the secondary barrier from becoming larger, thereby preventing bonding defects in the upper connection block.

Figure 1 is a partial cross-sectional view of a planar portion for explaining a liquefied gas storage tank according to a first embodiment of the present invention.
Figure 2 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the first embodiment of the present invention.
Figure 3 is a diagram showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.
Figure 4 is a view showing the results of another structural analysis of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.
Figure 5 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the second embodiment of the present invention.
Figure 6 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the second embodiment of the present invention.
Figure 7 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the third embodiment of the present invention.
Figure 8 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the third embodiment of the present invention.
Figure 9 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the fourth embodiment of the present invention.
Figure 10 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the fourth embodiment of the present invention.
Figure 11 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the fifth embodiment of the present invention.
Figure 12 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the fifth embodiment of the present invention.
Figure 13 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the sixth embodiment of the present invention.
Figure 14 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the sixth embodiment of the present invention.
Figure 15 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the seventh embodiment of the present invention.
Figure 16 is a view showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the seventh embodiment of the present invention.
Figure 17 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the eighth embodiment of the present invention.
Figure 18 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the ninth embodiment of the present invention.
FIG. 19 is a side view for explaining the unit upper block constituting the upper block of FIG. 18.
Figure 20 is an exploded view of the upper unit block of Figure 19.
Figure 21 is a diagram for explaining the process of assembling the upper unit block of Figure 20.
Figure 22 is a side view for explaining the upper connection block of Figure 18.
Figure 23 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the tenth embodiment of the present invention.
Figure 24 is a partially exploded perspective view of a corner portion for explaining the liquefied gas storage tank according to the tenth embodiment of the present invention.
Figure 25 is a front view for explaining the integrated upper block of Figure 23.
Figure 26 is a front view for explaining another embodiment of the integrated upper block of Figure 25.
Figure 27 is a side view of the integrated upper block of Figure 25.
FIG. 28 is a cross-sectional view taken along line A-A' in FIG. 25.
Figure 29 is a perspective view for explaining the upper connection block of Figure 23.
Figure 30 is a front view for explaining the upper connection block of Figure 23.
FIG. 31 is a cross-sectional view taken along line B-B' in FIG. 30.
Figure 32 is a cross-sectional view for explaining another embodiment of the integrated upper block of Figure 25.
Figure 33 is an exploded view of the integrated upper block of Figure 32.
Figures 34 to 37 show the convection path and secondary barrier that vary depending on the structure of the corner primary insulation wall and the corner connecting insulation wall in the liquefied gas storage tank according to the tenth embodiment of the present invention and the liquefied gas storage tank according to the comparative example. This is a drawing to compare and explain temperatures.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when adding reference numbers to the components of each drawing, it should be noted that the same components are given the same number as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Additionally, terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. And, among the terms used throughout the specification, the term 'outside' refers to the outside of the tank based on the liquefied gas storage tank, and the term 'inside' refers to the inside of the tank based on the liquefied gas storage tank. Let it be known.

Hereinafter, in this specification, liquefied gas may be used to encompass all gas fuels that are generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. For convenience, even if it is not in a liquid state by heating or pressurizing, it is referred to as liquefied gas. It can be expressed as This can also be applied to evaporation gas. In addition, for convenience, LNG can be used to encompass both NG (Natural Gas) in a liquid state as well as LNG in a supercritical state, and boil-off gas can be used to include not only gaseous boil-off gas but also liquefied boil-off gas. You can.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a partial cross-sectional view of a planar portion for explaining a liquefied gas storage tank according to a first embodiment of the present invention, and Figure 2 is a sectional view of a corner portion for explaining a liquefied gas storage tank according to a first embodiment of the present invention. It is a cross-sectional view, and Figure 3 is a diagram showing the results of structural analysis of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention, and Figure 4 is a view showing the corner of the liquefied gas storage tank according to the first embodiment of the present invention. This is a drawing showing the results of different structural analysis of the part.

Although not shown, the ship equipped with the liquefied gas storage tank (1) described below is a concept that encompasses not only merchant ships that transport cargo from the point of departure to the destination, but also marine structures that float at a certain point on the sea and perform specific tasks. Let me know. In addition, it should be noted that in the present invention, the liquefied gas storage tank 1 includes any type of tank that stores liquefied gas.

The liquefied gas storage tank 1 is provided on a ship and can store liquefied gas such as LNG, which is a very low temperature (approximately -160°C to -170°C) material, and may include a flat structure and a corner structure. For example, the transverse walls in the front and rear directions of the liquefied gas storage tank 1, the floor between the transverse walls, the vertical walls, and the ceiling may correspond to a planar structure. Additionally, for example, a structure where the horizontal wall, floor, vertical wall, and ceiling of the liquefied gas storage tank 1 meet may correspond to a corner structure. Here, the corner structure may include an obtuse angle corner structure or a right angle corner structure. When the thickness of the primary insulation wall 3 or the secondary insulation wall 5 is changed, a change in the obtuse angle corner structure or the right angle corner structure may be accompanied.

The planar structure of the liquefied gas storage tank 1 may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1, and the corner structure of the liquefied gas storage tank 1 may be formed as shown in FIG. 2. , It can be made up of a combination of multiple corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

As shown in Figures 1 and 2, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

This liquefied gas storage tank (1) may need to optimize the thickness of the primary insulation wall (3) and secondary insulation wall (5) in order to optimize insulation performance and storage capacity. For example, when polyurethane foam is used as the main material of the first insulation wall (3) and the second insulation wall (5), the total thickness of the first insulation wall (3) and the thickness of the second insulation wall (5) is 250 mm. It can be in the range of 500 mm, and in the case of this embodiment, the thickness of the primary insulation wall (3) and the thickness of the secondary insulation wall (5) in the flat block and the corner block can be the same or similar.

That is, compared to the existing liquefied gas storage tank in which the thickness of the primary insulation wall in the flat block and corner block is about 1/3 thinner than the thickness of the secondary insulation wall, this embodiment has a flat block and corner block. The thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 are the same or similar, the reason for which will be explained later.

Referring to Figure 1, the planar portion of the liquefied gas storage tank 1 according to the first embodiment of the present invention will first be described. The planar portion of the liquefied gas storage tank 1 is made up of a combination of a plurality of planar blocks, and the configuration of the planar block of the liquefied gas storage tank 1 described below is not only the first embodiment, but also the second embodiment described later. It should be noted in advance that the same applies to embodiments 1 to 8.

As shown in Figure 1, the flat block of the liquefied gas storage tank 1 is disposed on a flat part on the first or second side at different angles forming a storage space for accommodating the liquefied gas, and is made of metal. A flat primary insulating wall (3a) that secures the flat primary barrier (2a) and is disposed on the outside of the flat primary barrier (2a), and a flat secondary barrier (41a) provided on the outside of the flat primary insulating wall (3a). ) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

The flat primary barrier 2a is disposed on a flat portion of the first or second side at different angles to form a receiving space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. For example, the metal material may be stainless steel, but is not limited thereto. The flat primary barrier (2a), together with the flat secondary barrier (41a), can prevent liquefied gas from leaking to the outside.

The flat primary barrier (2a) is fixedly coupled to the upper part of the flat primary insulation wall (3a) by a metal strip (not shown), and is in direct contact with the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1). It can be installed as much as possible.

This flat primary barrier (2a) seals the flat primary insulation wall (3a) and the corner primary barrier (2b) shown in FIG. 2 when the flat block and the corner block shown in FIG. 2 are placed and connected. .

The flat primary insulation wall (3a) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the flat primary barrier (2a) and the flat secondary barrier It can be installed between the barriers 41a.

The flat primary insulation wall (3a) may have a structure in which flat primary plywood (31a) and flat primary insulation material (32a) are sequentially stacked on the outside of the flat primary barrier (2a), and the flat primary ply It may be formed to have a thickness of the combined thickness of the wood 31a and the thickness of the flat primary insulating material 32a, for example, 160 mm to 250 mm, but is not limited thereto.

The flat primary plywood (31a) can be installed between the flat primary barrier (2a) and the flat primary insulation (32a).

The flat primary insulating material 32a is made of a material with excellent insulation performance and excellent mechanical strength so as to block heat intrusion from the outside and withstand shock from the outside or shock due to liquefied gas sloshing from the inside. You can.

The flat primary insulation material (32a) may be formed of polyurethane foam between the flat primary plywood (31a) and the flat secondary barrier (4a), and occupies most of the thickness of the flat primary insulation wall (3a).

The flat primary insulation wall (3a) is a part of a flat block along with the flat secondary barrier (41a) and the flat secondary insulation wall (5a), and the flat primary insulation wall (3a) that forms the flat block is another composition of the flat block. It may have a width smaller than the width of the in-flat secondary insulation wall 5a. As a result, a portion of the flat secondary barrier (41a) may be exposed on both sides of the flat primary insulating wall (3a). When a plurality of flat blocks are arranged adjacently, a flat connection insulation wall (33a) is installed in the space between adjacent flat primary insulation walls (3a), that is, in the space where the flat secondary barrier (41a) is exposed. It can be.

The flat connection insulation wall (33a) is disposed between neighboring flat primary insulation walls (3a) when flat blocks are arranged adjacent to each other, and is a flat connection plywood (331a) that is the same or similar to the flat primary insulation wall (3a). and the flat connection insulation material 332a may be provided in a laminated form and have the same or similar thickness as the flat primary insulation wall 3a.

This flat connection insulation wall (33a) seals the space created between adjacent flat secondary insulation walls (5a) when a plurality of flat blocks are placed adjacent to each other, together with the flat connection barrier (42a), and protects them from the outside. It is installed to play the role of blocking heat intrusion.

The flat secondary barrier (41a) can be installed between the flat primary insulation wall (3a) and the flat secondary insulation wall (5a), and together with the flat primary barrier (2a) can prevent liquefied gas from leaking to the outside. You can.

The flat secondary barrier (41a) is a part of a flat block together with the flat primary insulating wall (3a) and the flat secondary insulating wall (5a), and when the flat blocks are placed adjacent to each other, the adjacent flat secondary barrier (41a) Can be connected by a flat connection barrier (42a).

The flat connection barrier (42a) can connect the neighboring flat secondary barrier (41) exposed to the outside when flat blocks are arranged adjacent to each other, and a flat connection insulation wall (33a) can be installed on the top.

The flat secondary insulation wall (5a), together with the flat primary insulation wall (3a) and the flat connection insulation wall (33a), blocks heat intrusion from the outside and protects against shock from the outside or shock from internal liquefied gas sloshing. It can be designed to withstand. In addition, the flat secondary insulation wall (5a) can be installed between the flat secondary barrier (4a) and the hull (7), and may be composed of a flat secondary insulation material (51a) and a flat secondary plywood (52a). You can.

The flat secondary insulation wall (5a) may have a structure in which a flat secondary insulation material (51a) and a flat secondary plywood (52a) are sequentially stacked on the outside of the flat secondary barrier (41a). The total thickness of the thickness of (51a) and the thickness of the flat secondary plywood (52a), for example, may be formed to be 150 mm to 240 mm, which is the same or similar to the thickness of the flat primary insulation wall (3a), and is limited thereto. That is not the case.

The flat secondary insulation material 51a is formed of a material with excellent insulation performance and excellent mechanical strength so as to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing. You can.

The flat secondary insulation material 51a may be formed of polyurethane foam between the flat secondary barrier 41a and the flat secondary plywood 52a, and occupies most of the thickness of the flat secondary insulation wall 5a.

The flat secondary plywood (52a) can be installed between the flat secondary insulation (51a) and the hull (7).

As described above, in the flat block of the liquefied gas storage tank (1) according to the present embodiment, the flat connection insulation wall (33a) encompassed by the flat primary insulation wall (3a) has a thickness of the flat secondary insulation wall (5a). It can be configured to have the same or similar thickness. To relate to this configuration, the flat connection insulation material 332a of the flat connection insulation wall 33a has a thickness of 90% to 110% of the flat secondary insulation material 51a, thereby forming a flat connection of the flat connection insulation wall 33a. The insulation material 332a may be configured to have the same or similar thickness as the flat secondary insulation material 51a.

That is, compared to the existing liquefied gas storage tank in which the thickness of the primary insulation wall in a flat block is about 1/3 thinner than the thickness of the secondary insulation wall, this embodiment has a flat primary insulation wall in a flat block ( The thickness of 3a) and the thickness of the flat secondary insulation wall (5a) are configured to be the same or similar, and this is to prevent damage to the flat secondary insulation wall (41a) due to low-temperature stress.

In general, the flat secondary barrier 41a and the flat secondary insulation wall 5a have differences in their shrinkage depending on the temperature to which they are exposed. In the case of the flat secondary barrier 41a and the flat secondary insulation wall 5a, As the thickness of the flat connection insulation wall 33a becomes thinner, it can be more affected by the cold and heat of cryogenic liquefied gas. Additionally, in this case, there is a problem that the temperature itself is lowered and the amount of shrinkage itself increases, which increases the stress at low temperature and increases the risk of damaging the flat secondary barrier (41a). This problem can especially occur in the flat connection barrier 42a, which interconnects the flat secondary barrier 41a by bonding or the like at the lower part of the flat connection insulation wall 33a. At the lower part of the flat connection insulation wall (33a), the flat connection barrier (42a) is connected to the flat secondary barrier (41a) of a plurality of flat blocks arranged adjacent to each other, and the flat secondary insulation wall (5a) of the flat block is contracted. This is because both ends of the flat connection barrier 42a may be deformed to move away from or become closer to each other.

In this embodiment, the thickness of the flat primary insulation wall 3a and the flat secondary insulation wall 5a covering the flat connection insulation wall 33a are formed to be the same or similar, thereby forming a flat insulation wall covering the flat connection insulation wall 33a. As the thickness of the primary insulation wall (3a) becomes relatively thicker than before, the cryogenic burden on the flat secondary barrier (41a) and especially the flat connection barrier (42a) is reduced, and also the flat secondary insulation wall (5a) As the thickness becomes relatively thinner compared to before, the amount of shrinkage itself decreases, thereby reducing stress at low temperatures. As a result, the risk of damage to the secondary barrier (4) in areas where multiple flat blocks are placed adjacent to each other is relatively lower than before.

With reference to Figure 2, the corner portion of the liquefied gas storage tank 1 according to the first embodiment of the present invention will be described. The corner portion of the liquefied gas storage tank (1) may be composed of a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below is described as an example of an obtuse corner structure forming an angle of 135 degrees, but is not limited to the numerical value.

As shown in Figure 2, the corner block of the liquefied gas storage tank 1 is disposed at a corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and is made of metal. A corner primary insulating wall (3b) that secures the corner primary barrier (2b) and is disposed on the outside of the corner primary barrier (2b), and a corner secondary barrier (3b) provided on the outside of the corner primary insulating wall (3b). 41b) and a corner secondary insulation wall (5b) disposed outside the corner secondary barrier (41b). Here, the corner primary insulation wall 3b may further include an inner bent portion 3b3.

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

Although not shown in FIG. 2, the corner primary barrier (2b) is attached to the corner primary insulation wall (3b) by a barrier fixing member installed in various ways, such as adhesive or bolting, at the upper end of the corner primary insulation wall (3b). It can be fixedly coupled and installed to directly contact the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1). Accordingly, the corner primary barrier 2b mentioned below may be used to include a barrier fixing member, etc.

This corner primary barrier (2b) seals the corner primary insulation wall (3b) and the flat primary barrier (2a) shown in FIG. 1 when connecting the corner block and the flat block shown in FIG. 1 by placing them adjacent to each other. It can be fixed to the inner primary plywood (31b) of the inner first fixing part (3b1) and the inner primary plywood (31b) of the inner second fixing part (3b2), and the insulation material (31b) of the inner bent part (3b3) The inner surface of 3b31) may be arranged to be bent at a certain angle, for example, an angle of 135 degrees.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and includes an inner primary plywood (31b), a corner primary insulation material (32b) on the outside of the corner primary barrier (2b), The outer primary plywood (33b) may include an inner first fixing part (3b1) and an inner second fixing part (3b2) configured in a sequentially stacked structure.

Here, the inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. It can be provided on the inside of the second side.

Additionally, the corner primary insulation wall 3b may include an inner bent portion 3b3 formed by filling the inner first fixing portion 3b1 and the inner second fixing portion 3b2 with an insulating material 3b31.

This corner primary insulation wall (3b) has a combined thickness of the inner primary plywood (31b), the corner primary insulation material (32b), and the outer primary plywood (33b) thickness, which is the flat primary insulation wall (33b) described above. It may be the same as the thickness of the thermal wall 3a (for example, a thickness of 160 mm to 250 mm).

The inner primary plywood (31b) may be installed between the corner primary barrier (2b) and the corner primary insulation (32b).

In this embodiment, as described above, the primary insulation wall 3 in the flat block and the corner block is formed to be relatively thicker than the thickness of the existing primary insulation wall, so the corner primary insulation wall 3b of the corner block is formed. The thickness of the inner primary plywood (31b) can be reduced, and the remaining thickness can be replaced with a corner primary insulation material (32b) formed of polyurethane foam.

The thickness of the inner primary plywood (31b) in this embodiment may be 20 mm to 80 mm.

As such, in this embodiment, the inner first and second fixing parts (3b1, 3b2) for holding the barrier fixing member to which the corner primary barrier (2b) is fixed in the corner block are made of plywood with a thickness of about 92 mm as before. By forming it in combination with the corner primary insulation material (32b) of polyurethane foam rather than only composed of polyurethane foam, insulation performance can be improved, weight can be reduced, and costs can be reduced compared to the existing plywood composed only. there is.

The corner primary insulation material (32b) may be placed between the inner primary plywood (31b) and the outer primary plywood (33b), and blocks heat intrusion from the outside while preventing shock from the outside or liquefaction from the inside. To withstand the impact caused by gas sloshing, it can be formed of high-density polyurethane foam, a material with excellent thermal insulation performance and excellent mechanical strength.

The outer primary plywood (33b) may be placed between the corner primary insulation material (32b) and the corner secondary barrier (41b) and may be fixed to the corner secondary barrier (41b).

The outer primary plywood (33b) may be formed to have a thickness of 6.5 mm to 15 mm.

As described above, the corner primary insulation wall (3b) of this embodiment is composed of a structure in which the inner primary plywood (31b), the corner primary insulation material (32b), and the outer primary plywood (33b) are sequentially stacked. Accordingly, the heat shrinkage of the corner primary insulation material (32b) is held by the high-strength inner primary plywood (31b) and the outer primary plywood (33b), thereby maintaining the space between the outer first and second fixing parts (5b1, 5b2). By preventing heat shrinkage of the corner primary insulation material (32b) from being applied directly to the secondary barriers (4, 41b, 42b) and providing the corner primary insulation material (32b) as an intermediate layer, the inner primary ply, which is sensitive to humidity, is It is possible to easily manage the tolerance of the wood (31b) and the outer primary plywood (33b).

The inner first and second fixing parts (3b1, 3b2) each consisting of the corner primary insulating wall (3b), the outer first and second fixing parts consisting of the corner secondary barrier (41b) and the corner secondary insulating wall (5b) (5b1, 5b2), and the width of each of the inner first and second fixing parts (3b1, 3b2) may be smaller than the width of the outer first and second fixing parts (5b1, 5b2). For this reason, when a plurality of corner blocks are arranged adjacently along the side of the corner where the first and second surfaces at different angles face each other, between the inner first and second fixing parts 3b1 and 3b2 that are adjacent to each other. An inner bent portion 3b3 may be formed in the space portion of , that is, the space portion where the corner secondary barrier 41b is exposed.

The inner bent portion 3b3 may be filled with an insulating material 3b31.

The insulation material 3b31 of the inner bent portion 3b3 may be low-density polyurethane foam, and a corner secondary barrier 41b and a corner connecting barrier 42b are laminated on the outer surface bent at a certain angle, for example, 135 degrees. A secondary barrier (4) may be provided.

The insulation material 3b31 of the inner bent portion 3b3 is used to form a space between the outer first and second fixing portions 5b1 and 5b2 that are adjacent to each other when a plurality of corner blocks are arranged adjacent to each other. It can serve to block heat intrusion from the outside while being sealed together with (42b).

The corner secondary barrier 41b may be provided outside the corner primary insulation wall 3b. The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and together with the corner primary barrier (2b) can prevent liquefied gas from leaking to the outside. You can.

The corner secondary barrier (41b) is a part of the corner block along with the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1) , 5b2), neighboring corner secondary barriers 41b may be connected by a corner connection barrier 42b.

The corner connection barrier (42b) can connect the neighboring corner secondary barrier (41) exposed to the outside when corner blocks are placed adjacent to each other, and the insulation material (3b31) of the inner bent portion (3b3) is installed on the upper part. , It can serve to block heat intrusion from the outside by sealing the space created between the insulation material 3b31 of the inner bent portion 3b3 and the outer first and second fixing portions 5b1 and 5b2 disposed adjacent to each other. . In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

At the point where the outer first and second fixing parts 5b1 and 5b2 meet, the secondary barrier 4 in which the corner secondary barrier 41b and the corner connecting barrier 42b are laminated may be arranged to be bent.

The corner secondary insulation wall 5b may be disposed outside the corner secondary barrier 41b. The corner secondary insulation wall 5b, together with the corner primary insulation wall 3b and the insulation material 3b31 of the inner bent portion 3b3, blocks heat intrusion from the outside and protects against shock from the outside or liquefied gas sloshing from the inside. It can be designed to withstand shock caused by In addition, the corner secondary insulation wall (5b) can be installed between the corner secondary barrier (4b) and the hull (7), and the inner secondary plywood (51b), the corner secondary insulation material (52b), and the outer secondary ply It may be configured to include wood 53b.

The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

Here, the outer first fixing part 5b1 may be fixed to the inside of the first surface, and the outer second fixing part 5b2 may be fixed to the inside of the second surface.

The side facing the outer first fixing part 5b1 fixed to the first surface and the outer second fixing part 5b2 fixed to the second surface may be inclined in the direction ED to equally divide the corner portion. there is. In this embodiment, it is explained that the corner portion is divided equally, but it is not limited to this and may not be equal depending on the corner location, so it goes without saying that the corner portion can be inclined in the direction (ED) in which the corner portion is divided unevenly.

This corner secondary insulation wall (5b) has a total thickness of the thickness of the inner secondary plywood (51b), the thickness of the corner secondary insulation material (52b), and the thickness of the outer secondary plywood (53b), which is the thickness of the above-mentioned flat 2. It may be the same as the thickness of the thermal barrier wall 5a (for example, a thickness of 150 mm to 240 mm).

The inner secondary plywood (51b) can be placed between the corner secondary barrier (2b) and the corner secondary insulation (51b), and the corner secondary barrier (2b) can be fixed. The inner secondary plywood (51b) may be formed to have a thickness of 6.5 mm to 15 mm.

The corner secondary insulation material 52b is formed of a material with excellent insulation performance and excellent mechanical strength so as to block heat intrusion from the outside and withstand shock from the outside or shock from liquefied gas sloshing from the inside. You can.

The corner secondary insulation material 52b may be formed of polyurethane foam between the inner secondary plywood 51b and the outer secondary plywood 53b, and occupies most of the thickness of the corner secondary insulation wall 5b. .

The outer secondary plywood (53b) may be installed between the corner secondary insulation (52b) and the hull (7). The outer secondary plywood 53b may be formed to have a thickness of 6.5 mm to 25 mm.

In the liquefied gas storage tank (1) according to the present embodiment described above, as the thickness of the primary insulation wall (3) becomes relatively thicker than before, the secondary barrier (4) is formed in the hull ( 7) As it moves to the side, the radius of curvature increases. In this case, the radius of curvature of the secondary barrier (4) increases at the corner portion, and the part where the secondary barrier (4) is non-adhered to the secondary insulating wall (5) The length also increases. This means that the flexibility of the secondary barrier (4) in the obtuse corner structure is increased. This makes it easier for the secondary barrier (4) to absorb peripheral deformation, for example, hull deformation, and reduces low-temperature stress in the obtuse corner structure. I do it. In the case of this embodiment, the length of the non-adhered portion may be, for example, 0 mm to 100 mm, preferably 50 mm to 100 mm.

As described above, the secondary barrier (4) in the obtuse corner structure of the present invention reduces the low temperature applied to the existing secondary barrier (4) compared to the obtuse corner structure of the primary insulation wall (3) formed with a relatively thin thickness. Stress can be reduced. Additionally, the non-bonded portion increases, making it easier to absorb hull deformation.

This was proven through the results of structural analysis of the corner portion of the liquefied gas storage tank 1 according to this embodiment in FIGS. 3 and 4.

The conditions for performing the structural analysis were heat transfer analysis was performed at 20 degrees Celsius at the hull location and -163 degrees Celsius at the primary barrier, and structural analysis was performed using the resulting temperature distribution.

In addition, in the existing liquefied gas storage tank for comparing the results obtained from the structural analysis of the liquefied gas storage tank (1) according to this embodiment, the thickness of the primary insulation wall in the flat block and corner block is approximately less than the thickness of the secondary insulation wall. It has a thickness of about 1/3, the fixing members corresponding to the first and second inner fixing parts (3b1, 3b2) are composed only of plywood, and the length of the non-adhesive part is 50 mm, and this existing liquefied gas storage In the tank, the stress value in the YY direction at the bent part of the secondary barrier was about 66.8984 MPa, and the temperature was about -135.857°C.

The stress value in the YY direction obtained as a result of structural analysis is the stress value at the corner, and the lower the stress, the lower the stress. The temperature is the temperature at the corner, and the higher the temperature, the less stress (represents the changed value after installation at room temperature 25°C).

It should be noted in advance that the above conditions apply equally to the structural analysis of the liquefied gas storage tank 1 according to the second to seventh embodiments, which will be described later, as well as this embodiment.

Figure 3 shows the YY direction of the secondary barriers (4, 41b, 42b) at the part where the outer first and second fixing parts (5b1, 5b2) face each other and are bent, when the length of the non-bonded part in this embodiment is 50 mm. As a result of structural analysis of the stress value and temperature distribution, the stress value in the YY direction was 37.155 MPa and the temperature was -57.940°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 4 shows the YY direction of the secondary barriers (4, 41b, 42b) at the part where the outer first and second fixing parts (5b1, 5b2) face each other and are bent, when the length of the non-bonded part in this embodiment is 97 mm. As a result of structural analysis of the stress value and temperature distribution, the stress value in the YY direction was 12.084 MPa and the temperature was -59.025°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Through this, in this embodiment, the inner first and second fixing parts (3b1, 3b2) for holding the barrier fixing member to which the corner primary barrier (2b) is fixed in the corner block are not made of plywood but of polyurethane foam. By forming it in a combination with the insulation material 3b31, the insulation performance can be improved, the weight can be reduced, and the cost can be reduced compared to the existing plywood structure alone.

In addition, in this embodiment, the corner primary insulation wall (3b) of the corner block connected to the flat primary insulation wall (3a) of the flat block and the corner secondary insulation wall (3b) of the corner block connected to the flat secondary insulation wall (5a) of the flat block. By configuring the thickness of the thermal wall (5b) to be the same or similar, the thickness of the corner primary insulation wall (3b) becomes relatively thick compared to the existing one (however, the thickness of the corner secondary insulation wall (5b) maintains the mechanical strength at a certain level. thickness), the low temperature burden and sloshing burden of the secondary barriers (4, 41b, 42b) between the outer first and second fixing parts (5b1, 5b2) can be reduced, and the secondary barriers (4, 41b, Not only can damage to 42b) be prevented, but the low-temperature burden on the secondary barriers (4, 41b, 42b) is reduced, thereby preventing brittle fracture of the hull (7).

In addition, in this embodiment, the thickness of the corner primary insulation wall (3b) is configured to be relatively thicker than the existing one, so that the length of the portion where the secondary barriers (4, 41b, 42b) are non-adhered to the corner secondary insulation wall (5b) can be increased, not only can the probability of damage to the secondary barriers (4, 41b, 42b) be further reduced due to the increase in flexibility of the secondary barriers (4, 41b, 42b), but also the secondary barriers (4, 41b, 42b) can be increased. , 41b, 42b) makes it easier to absorb hull deformation, and low-temperature stress can be further reduced.

Figure 5 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the second embodiment of the present invention, and Figure 6 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the second embodiment of the present invention. This is a drawing showing .

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 5 As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, a flat primary insulation wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulation wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 5.

As shown in Figures 1 and 5, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in Figure 5, the corner portion of the liquefied gas storage tank 1 according to the second embodiment of the present invention may be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below may be an obtuse corner structure forming a certain angle, for example, an angle of 135 degrees.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here. However, the bending angle of the corner primary insulating wall 2b of the present embodiment may vary as the configuration of the corner primary insulating wall 3b is different from that of the first embodiment. Hereinafter, the corner primary insulating wall 3b is described below. I will mention it when explaining.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b. The configuration of the corner primary insulation wall 3b of the present embodiment is that, compared to the above-described first embodiment, the outer primary plywood 33b of the first embodiment is omitted, and the insulation material 3b31 of the first embodiment is filled. The difference in the first embodiment is that the inner intermediate fixing portion 3b12 is provided at the portion where the inner bent portion 3b3 is disposed, and other configurations are the same or similar to those of the first embodiment. Here, the different configurations will be mainly described. do.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the corner primary barrier (2b). It may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulation material 32b of this embodiment may be the same or similar to the above-described first embodiment, and thus detailed description is omitted to avoid redundant description. .

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

In addition, the corner primary insulation wall 3b may include an inner intermediate fixing part 3b12 provided between the inner first fixing part 3b1 and the inner second fixing part 3b2.

The inner intermediate fixing portion (3b12) is disposed on the inside of the corner intermediate insulation material (32b12) and the corner intermediate insulation material (32b12), which are fixed to the corner connecting barrier (42b) connecting the neighboring corner secondary barriers (41b), and are located at the corners. The primary barrier (2b) may include an inner intermediate plywood (31b12) to which it is fixed.

The inner intermediate plywood (31b12) may be formed in the same or similar structure as the inner primary plywood (31b), and the corner primary barrier (2b) may be fixed together with the inner primary plywood (31b). .

This inner intermediate plywood 31b12 may be parallel to a direction perpendicular to the direction of equal division (ED) when the corner portion is equally divided. However, of course, the inner intermediate plywood 31b12 may not be parallel to the direction perpendicular to the direction (ED) in which the corner portion is divided when the corner portion is divided unevenly.

The corner intermediate insulation material 32b12 may be formed of the same or similar material as the corner primary insulation material 32b. The corner intermediate insulation material 32b12 may be formed of high-density polyurethane foam.

This corner intermediate insulation material (32b12), when a plurality of corner blocks are arranged adjacently, fills the space created between the adjacent first and second outer fixing parts (5b1, 5b2) together with the corner connecting barrier (42b). It can play a role in sealing and blocking heat intrusion from the outside. In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

By providing the inner intermediate plywood (31b12) between the inner first fixing part (3b1) and the inner second fixing part (3b2), the corner primary barrier (2b) is formed on the inner side of the inner first fixing part (3b1). It is fixed to the secondary plywood (31b), the inner intermediate plywood (31b12) of the inner intermediate fixing part (3b12), and the inner primary plywood (31b) of the inner second fixing part (3b2), and the inner first fixing part ( It may be arranged to be bent in an angle range of 150 to 160 degrees between 3b1) and the inner intermediate fixing part 3b12 and between the inner intermediate fixing part 3b12 and the inner second fixing part 3b2.

Through this, in this embodiment, the inner first fixing part 3b1 and the inner second fixing part 3b2 provided on the inside of the first and second surfaces at different angles are spaced at a certain distance, and the inner first fixing part 3b2 is provided on the inside of the first and second surfaces at different angles. By providing the inner intermediate fixing part (3b12) between the first and second fixing parts (3b1, 3b2), the bending angle of the corner primary barrier (2b) can be alleviated by the inner intermediate fixing part (3b12), thereby reducing the corner Not only can the sloshing burden on the primary barrier 2b be reduced, but the mechanical strength of the corner can be increased.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1, 5b2) ) The neighboring corner secondary barriers (41b) can be connected by the corner connection barrier (42b), and together with the corner primary barrier (2b), liquefied gas can be prevented from leaking to the outside. The corner secondary barrier 41b of this embodiment is the same or similar to the first embodiment described above, and detailed description is omitted to avoid redundant description.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

The corner secondary insulation wall 5b of this embodiment is the same or similar to the above-described first embodiment, and detailed description is omitted to avoid redundant description.

Figure 6 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 10.982 MPa and the temperature was -67.914°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 7 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the third embodiment of the present invention, and Figure 8 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the third embodiment of the present invention. This is a drawing showing .

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 7 As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, and a flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulating wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 7.

As shown in Figures 1 and 7, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in FIG. 7, the corner portion of the liquefied gas storage tank 1 according to the third embodiment of the present invention may be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below may be an obtuse corner structure forming a certain angle, for example, an angle of 135 degrees.

Of course, in this embodiment, unlike the drawing, the corner primary insulation wall (3b) can be positioned so that the corner secondary barrier (41b) constructed on the corner secondary insulation wall (5b) is exposed at the center of the corner. . Therefore, the exposed corner secondary barriers (41b) are finished by interconnecting them with the corner connection barriers (42b), or the corner primary insulation walls (3b) are connected to the corner secondary barriers (41b) arranged adjacent to each other. Of course, it is also possible to construct the connection barrier (42b) and then laminate it on the corner secondary barrier (41b)/corner connection barrier (42b). In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b. The configuration of the corner primary insulation wall 3b of this embodiment is the same or similar to that of the above-described first embodiment except that the outer primary plywood 33b is omitted. Here, the different configurations will be mainly described.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the corner primary barrier (2b). It may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulation material 32b of this embodiment may be the same or similar to the above-described first embodiment, and thus detailed description is omitted to avoid redundant description. .

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

Additionally, the corner primary insulating wall 3b may include an inner bent portion 3b3 formed by filling an insulating material 3b32 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The insulating material 3b32 of the inner bent portion 3b3 of this embodiment may be the same or similar to that of the first embodiment described above, and thus detailed description will be omitted to avoid redundant description.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1, 5b2) ) The neighboring corner secondary barriers (41b) can be connected by the corner connection barrier (42b), and together with the corner primary barrier (2b), liquefied gas can be prevented from leaking to the outside. The corner secondary barrier 41b of this embodiment may have the same or similar basic structure as the first embodiment described above. However, the corner secondary barrier 41b encompassing the corner connecting barrier 42b of the present embodiment may have a different arrangement relationship as the partial configuration of the corner secondary insulation wall 5b is different from the above-described first embodiment. This will be mentioned below when explaining the corner secondary insulation wall 5b.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

The sides of the outer first fixing part 5b1 and the outer second fixing part 5b2 described above may be inclined in the direction ED to equally divide the corner portion. In this embodiment, it is explained that the corner portion is divided equally, but it is not limited to this and may not be equal depending on the corner location, so it goes without saying that the corner portion can be inclined in the direction (ED) in which the corner portion is divided unevenly.

The outer first fixing part 5b1 and the outer second fixing part 5b2 may have chamfers formed at the corners facing each other.

In addition, the corner secondary insulation wall 5b includes an outer bent portion 5b3 including an insulating material 5b31 filled between the outer first fixing portion 5b1 and the chamfer portion of the outer second fixing portion 5b2. can do. The insulation material 5b31 of the outer bent portion 5b3 may be low-density polyurethane foam.

The insulation material 5b31 of the outer bent part 5b3 is provided in the chamfered portion of the outer first fixing part 5b1 and the outer second fixing part 5b2, thereby creating a corner secondary barrier (42b) encompassing the corner connecting barrier 42b. 41b) is the inner secondary plywood 51b of the outer first fixing part 5b1, the insulation material 5b31 of the outer bent part 5b3, and the inner secondary plywood 51b of the outer second fixing part 5b2. ), and may be arranged to be bent at a certain angle, for example, an angle of 135 degrees, on the inside of the insulation material 5b31 of the outer bent portion 5b3.

Through this, in this embodiment, a chamfer is formed at the corner where the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed to the first and second surfaces at different angles, face each other, and the chamfer By providing the insulation material 5b31 of the outer bent portion 5b3 made of low-density polyurethane foam, the insulation performance at the corner portion can be further increased by the low-density polyurethane foam.

Figure 8 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 12.003MPa and the temperature was -64.358°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 9 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the fourth embodiment of the present invention, and Figure 10 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the fourth embodiment of the present invention. This is a drawing showing .

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 9 As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, and a flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulating wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 9.

As shown in Figures 1 and 9, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in Figure 9, the corner portion of the liquefied gas storage tank 1 according to the fourth embodiment of the present invention may be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below may be an obtuse corner structure forming a certain angle, for example, an angle of 135 degrees.

Of course, in this embodiment, unlike the drawing, the corner primary insulation wall (3b) can be positioned so that the corner secondary barrier (41b) constructed on the corner secondary insulation wall (5b) is exposed at the center of the corner. . Therefore, the exposed corner secondary barriers (41b) are finished by interconnecting them with the corner connection barriers (42b), or the corner primary insulation walls (3b) are connected to the corner secondary barriers (41b) arranged adjacent to each other. Of course, it is also possible to construct the connection barrier (42b) and then laminate it on the corner secondary barrier (41b)/corner connection barrier (42b). In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b. The configuration of the corner primary insulation wall (3b) of the present embodiment is the same as that of the first embodiment described above, except that the outer primary plywood (33b) is omitted and the configuration of the inner bent portion (3b3) is different. Since it is similar, here we will mainly explain the different configurations.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the corner primary barrier (2b). It may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulation material 32b of this embodiment may be the same or similar to the above-described first embodiment, and thus detailed description is omitted to avoid redundant description. .

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

In addition, the corner primary insulation wall (3b) is filled between the inner first fixing part (3b1) and the inner second fixing part (3b2), and is located on the corner secondary barrier (41b) encompassing the corner connecting barrier (42b). It may include an inner bent portion (3b3) including an outer insulator (3b33) provided in and an inner insulator (3b34) provided between the outer insulator (3b33) and the corner primary barrier (2b).

The outer insulating material 3b33 of the inner bent portion 3b3 may be glass wool, and a corner secondary barrier 41b and a corner connecting barrier 42b are laminated on the outer surface bent at a certain angle, for example, 135 degrees. A secondary barrier (4) may be provided.

The inner insulation material 3b34 of the inner bent portion 3b3 may be low-density polyurethane foam, and a corner primary barrier 2b may be provided on the inner surface bent at a certain angle, for example, an angle of 135 degrees.

The thickness of each of the outer insulating material 3b33 and the inner insulating material 3b34 of the inner bent portion 3b3 can be freely adjusted.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1, 5b2) ) The neighboring corner secondary barriers (41b) can be connected by the corner connection barrier (42b), and together with the corner primary barrier (2b), liquefied gas can be prevented from leaking to the outside. The corner secondary barrier 41b of this embodiment may have the same or similar basic structure as the first embodiment described above. However, the corner secondary barrier (41b) encompassing the corner connection barrier (42b) of the present embodiment has some configurations of the corner primary insulation wall (3b) and the corner secondary insulation wall (5b) in the first embodiment described above. Depending on the difference, the arrangement relationship may vary, which will be mentioned below when explaining the corner secondary insulation wall 5b.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

The sides of the outer first fixing part 5b1 and the outer second fixing part 5b2 described above may be inclined in the direction ED to equally divide the corner portion. In this embodiment, it is explained that the corner portion is divided equally, but it is not limited to this and may not be equal depending on the corner location, so it goes without saying that the corner portion can be inclined in the direction (ED) in which the corner portion is divided unevenly.

A step may be formed at the edge of the outer first fixing part 5b1 and the outer second fixing part 5b2 facing each other.

In addition, the corner secondary insulation wall 5b includes an outer bent portion 5b3 including an insulating material 5b32 filled between the stepped portions of the outer first fixing portion 5b1 and the outer second fixing portion 5b2. can do. The insulating material 5b32 of the outer bent portion 5b3 may be glass wool, which is the same material as the outer insulating material 3b33 of the inner bent portion 3b3.

The insulation material 5b32 of the outer bent part 5b3 is provided at the step portion between the outer first fixing part 5b1 and the outer second fixing part 5b2, thereby creating a corner secondary barrier (42b) encompassing the corner connecting barrier 42b. 41b) is the inner secondary plywood 51b of the outer first fixing part 5b1, the insulation material 5b32 of the outer bent part 5b3, and the inner secondary plywood 51b of the outer second fixing part 5b2. ), and may be arranged to be bent at a certain angle, for example, an angle of 135 degrees, on the inside of the insulation material 5b32 of the outer bent portion 5b3.

Through this, in this embodiment, a step is formed at the corner where the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed to the first and second surfaces at different angles, face each other, and the step is The insulation material 5b32 of the outer bent portion 5b3 made of glass wool is provided, and the inner bent portion 5b3 made of glass wool is provided with the corner secondary barrier 41b encompassing the corner connecting barrier 42b in between. By providing the outer insulation material (3b33), the flexibility of the corner secondary barrier (41b) encompassing the corner connecting barrier (42b) formed between the glass wool is improved, thereby increasing the corner secondary barrier (41b) encompassing the corner connecting barrier (42b) Damage to 41b) can be further prevented.

Figure 10 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 12.003MPa and the temperature was -64.358°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 11 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the fifth embodiment of the present invention, and Figure 12 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the fifth embodiment of the present invention. This is a drawing showing .

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 11. As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, and a flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulating wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 11.

As shown in Figures 1 and 11, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in FIG. 11, the corner portion of the liquefied gas storage tank 1 according to the fifth embodiment of the present invention may be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below may be an obtuse corner structure forming a certain angle, for example, an angle of 135 degrees.

Of course, in this embodiment, unlike the drawing, the corner primary insulation wall (3b) can be positioned so that the corner secondary barrier (41b) constructed on the corner secondary insulation wall (5b) is exposed at the center of the corner. . Therefore, the exposed corner secondary barriers (41b) are finished by interconnecting them with the corner connection barriers (42b), or the corner primary insulation walls (3b) are connected to the corner secondary barriers (41b) arranged adjacent to each other. Of course, it is also possible to construct the connection barrier (42b) and then laminate it on the corner secondary barrier (41b)/corner connection barrier (42b). In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b. The configuration of the corner primary insulation wall 3b of this embodiment is the same or similar to that of the above-described first embodiment except that the outer primary plywood 33b is omitted. Here, the different configurations will be mainly described.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the corner primary barrier (2b). It may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulation material 32b of this embodiment may be the same or similar to the above-described first embodiment, and thus detailed description is omitted to avoid redundant description. .

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

Additionally, the corner primary insulating wall 3b may include an inner bent portion 3b3 formed by filling an insulating material 3b35 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The insulating material 3b35 of the inner bent portion 3b3 of this embodiment may be the same or similar to that of the first embodiment described above, and thus detailed description is omitted to avoid redundant description.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1, 5b2) ) The neighboring corner secondary barriers (41b) can be connected by the corner connection barrier (42b), and together with the corner primary barrier (2b), liquefied gas can be prevented from leaking to the outside. The corner secondary barrier 41b of this embodiment may have the same or similar basic structure as the first embodiment described above. However, the corner secondary barrier 41b encompassing the corner connecting barrier 42b of the present embodiment may have a different arrangement relationship as the partial configuration of the corner secondary insulation wall 5b is different from the above-described first embodiment. This will be mentioned below when explaining the corner secondary insulation wall 5b.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

In addition, the corner secondary insulation wall (5b) is provided between the outer first fixing part (5b1) and the outer second fixing part (5b2), and is the corner secondary barrier (41b) encompassing the corner connecting barrier (42b). It may include an outer intermediate fixing part 5b12 on which the bent portion is seated.

The outer intermediate fixing portion (5b12) includes an outer intermediate plywood (51b12) fixed to the first and second surfaces, respectively, an outer intermediate insulating material (52b12) provided on the inside of the outer intermediate plywood (51b12), and an outer intermediate plywood (51b12) fixed to the first and second surfaces, respectively. It is provided inside the intermediate insulation material (52b12) and may include an inner intermediate insulation material (53b12) on which the bent portion of the corner secondary barrier (41b) encompassing the corner connection barrier (42b) is seated.

The outer intermediate plywood (51b12) is located on the same line as the inner secondary plywood (51b) and may have the same configuration.

The outer intermediate insulation material 52b12 may be polyurethane foam.

The inner intermediate insulation material 53b12 may be glass wool.

An outer intermediate fixing part (5b12) in which the outer intermediate plywood (51b12), the outer intermediate insulation material (52b12), and the inner intermediate insulation material (53b12) are laminated between the outer first fixing part (5b1) and the outer second fixing part (5b2). By providing, the corner secondary barrier (41b) encompassing the corner connection barrier (42b) is located between the inner secondary plywood (51b) of the outer first fixing part (5b1) and the inner middle of the outer intermediate fixing part (5b12). The insulation material (53b12) is fixed to the inner secondary plywood (51b) of the outer second fixing part (5b2), and is formed at a certain angle, for example 135, on the inside of the inner intermediate insulation material (53b12) of the outer intermediate fixing part (5b12). It may be arranged to be bent at an angle of degrees.

Through this, in this embodiment, an outer intermediate fixing part 5b12 is provided between the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed to the first and second surfaces at different angles. However, the flexibility of the corner secondary barrier (41b), which encompasses the corner connection barrier (42b) formed on the upper part of the inner intermediate insulation (53b12) of the outer intermediate fixing part (5b12) made of glass wool, is improved, so that the corner connection barrier (42b) Damage to the corner secondary barrier (41b) encompassing can be further prevented.

In addition, in this embodiment, the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed to the first and second surfaces at different angles, are spaced at a certain distance, and the outer first, By providing an outer intermediate fixing part (5b12) between the second fixing parts (5b1, 5b2), between the first outer fixing part (5b1) and the outer intermediate fixing part (5b12) and between the outer second fixing part (5b2) and the outer middle. Contraction or expansion stress due to temperature in the outer fixing parts 5b1, 5b2, and 5b12 having two gaps of the present embodiment compared to the existing outer fixing part having one gap due to the gap formed between each of the fixing parts 5b12. Damage to the corner secondary barrier (41b), which includes the corner connection barrier (42b) fixed to the outer fixing parts (5b1, 5b2, and 5b12), can be prevented by alleviating stress.

Figure 12 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 13.101 MPa and the temperature was -74.480°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 13 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the sixth embodiment of the present invention, and Figure 14 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the sixth embodiment of the present invention. This is a drawing showing .

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 13. As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, and a flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulating wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 13.

As shown in Figures 1 and 13, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in FIG. 13, the corner portion of the liquefied gas storage tank 1 according to the sixth embodiment of the present invention may be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below may be an obtuse corner structure forming a certain angle, for example, an angle of 135 degrees.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside.

The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b. The configuration of the corner primary insulation wall (3b) of this embodiment is that, compared to the above-described first embodiment, the outer primary plywood (33b) is omitted, and the outer surface shape of the insulation material (3b31) of the inner bent portion (3b3) is Bars that are the same or similar excluding those that are different will be explained here, focusing on the different configurations.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the corner primary barrier (2b). It may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulation material 32b of this embodiment may be the same or similar to the above-described first embodiment, and thus detailed description is omitted to avoid redundant description. .

The inner first fixing part 3b1 is fixed to the outer first fixing part 5b1 and is provided on the inside of the first surface, and the inner second fixing part 3b2 is fixed to the outer second fixing part 5b2. Can be provided on the inside of two sides,

Additionally, the corner primary insulating wall 3b may include an inner bent portion 3b3 formed by filling an insulating material 3b36 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The insulation material 3b36 of the inner bent portion 3b3 of this embodiment may be the same or similar to that of the first embodiment described above. However, the shape of the outer surface of the insulation material 3b36 of the inner bent portion 3b3 in this embodiment may change as the configuration of the first and second outer fixing portions 5b1 and 5b2 changes.

That is, the insulation material 3b36 of the inner bent portion 3b3 of the present embodiment has a chamfer formed at the corner where the outer first fixing part 5b1 and the outer second fixing part 5b2 face each other, so that the outer surface is inner. It has a shape that protrudes outward compared to the first fixing part 3b1 or the inner second fixing part 3b2.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the outer first and second fixing parts (5b1, 5b2) ) The neighboring corner secondary barriers (41b) can be connected by the corner connection barrier (42b), and together with the corner primary barrier (2b), liquefied gas can be prevented from leaking to the outside. In this embodiment, the corner connection barrier 42b is formed not only between the first and second inner fixing parts 3b1 and 3b2, but also extends to a length that overlaps at least the first and second inner fixing parts 3b1 and 3b2. You can.

The corner secondary barrier 41b of this embodiment may have the same or similar basic structure as the first embodiment described above. However, the corner secondary barrier 41b encompassing the corner connecting barrier 42b of the present embodiment may have a different arrangement relationship as the partial configuration of the corner secondary insulation wall 5b is different from the above-described first embodiment. This will be mentioned below when explaining the corner secondary insulation wall 5b.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood (53b) may include an outer first fixing part (5b1) and an outer second fixing part (5b2) configured in a sequentially stacked structure.

The sides of the outer first fixing part 5b1 and the outer second fixing part 5b2 described above may be inclined in the direction ED to equally divide the corner portion. In this embodiment, it is explained that the corner portion is divided equally, but it is not limited to this and may not be equal depending on the corner location, so it goes without saying that the corner portion can be inclined in the direction (ED) in which the corner portion is divided unevenly.

The outer first fixing part 5b1 and the outer second fixing part 5b2 may have chamfers formed at the corners facing each other.

In this embodiment, the inner secondary plywood (51b) is parallel to the outer secondary plywood (53b) and has a peripheral plywood (51b1) fixed on the corner secondary insulation material (52b), and a peripheral plywood (51b1). ) and may be composed of inclined plywood (51b2) fixed on the corner secondary insulation (52b) of the chamfer portion. Accordingly, unlike the first embodiment described above, a corner primary insulation material 32b is provided on the peripheral plywood 51b1, and an insulation material 3b36 of the inner bent portion 3b3 is provided on the inclined plywood 51b2. You can.

By providing the inclined plywood (51b2) and the insulation material (3b36) of the inner bent part (3b3) in the chamfered portions of the outer first fixing part (5b1) and the outer second fixing part (5b2), the corner connecting barrier (42b) is formed. The corner secondary barrier (41b) encompassing the peripheral plywood (51b1) of the outer first fixing part (5b1), the inclined plywood (5b2) of the outer first fixing part (5b1), and the outer second fixing part (5b2) ) of the inclined plywood (5b2) and the surrounding plywood (51b1) of the outer second fixing part (5b2).

In addition, the corner secondary barrier 41b encompassing the corner connection barrier 42b is bent to protrude outward to be seated on the chamfered portion of the outer first fixing part 5b1 and the outer second fixing part 5b2. You can.

That is, the corner secondary barrier (41b) encompassing the corner connection barrier (42b) includes the peripheral plywood (51b1) of the outer first fixing part (5b1) and the inclined plywood (51b2) of the outer first fixing part (5b1). ) is bent outwardly between the inclined plywood (51b2) of the outer first fixing part (5b1) and the inclined plywood (51b2) of the outer second fixing part (5b2), and is bent inwardly between the inclined plywood (51b2) of the outer first fixing part (5b1) and the outer second fixing part (5b2) It may be arranged to be bent outward between the inclined plywood 51b2 of the top 5b2 and the peripheral plywood 51b1 of the outer second fixing part 5b2.

Through this, in this embodiment, a chamfer is formed at the corner where the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed to the first and second surfaces at different angles, face each other, and the chamfer By installing a corner secondary barrier (41b) encompassing the corner connecting barrier (42b) along the surfaces of the outer first and second fixing parts (5b1, 5b2) including the portion, a corner covering the corner connecting barrier (42b) is formed. The secondary barrier (41b) protrudes and bends outward, increasing the length of the non-adhered portion to the corner secondary insulation wall (5b), thereby increasing the flexibility of the corner secondary barrier (41b) encompassing the corner connecting barrier (42b). Due to the increase, not only can the probability of damage to the corner secondary barrier (41b) encompassing the corner connecting barrier (42b) be further reduced, but also the corner secondary barrier (41b) encompassing the corner connecting barrier (42b) can absorb hull deformation. becomes easier, and low-temperature stress can be further reduced.

Figure 14 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 7.197MPa and the temperature was -53.710°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 15 is a cross-sectional view of a corner portion for explaining the liquefied gas storage tank according to the seventh embodiment of the present invention, and Figure 16 is a structural analysis result of the corner portion of the liquefied gas storage tank according to the seventh embodiment of the present invention. This is a drawing showing .

As shown in FIG. 15, compared to the liquefied gas storage tank 1 of the first embodiment described above, the liquefied gas storage tank 1 of the present embodiment has the same configuration except for the configuration of the inner bent portion 3b3. Or, it may be similar, and accordingly, to avoid redundant explanation of the same configuration, detailed description will be omitted and explanation will focus on the different configuration.

The configuration of the corner primary insulation wall 3b of the present embodiment is the same or the same as that of the above-described first embodiment except that the configuration of the portion where the inner bent portion 3b3, which is composed of filling the insulation material 3b31, is disposed is different. Since it is similar, here we will mainly explain the different configurations.

The corner primary insulation wall (3b) of this embodiment may include a vacuum insulation panel (3b37) filled in the inner bent portion (3b3) between the inner first fixing part (3b1) and the inner second fixing part (3b2). there is.

In the case of this embodiment, the inner first fixing part 3b1 and the inner second fixing part 3b2 are non-structural members, so there is a structural member between the inner first fixing part 3b1 and the inner second fixing part 3b2. Construction of the vacuum insulation panel (3b37) is easy. The vacuum insulation panel 3b37 has excellent insulation performance among various insulation materials such as polyurethane foam, and can improve insulation performance at corners.

Figure 16 shows the results of structural analysis of the YY direction stress values and temperature distribution of the secondary barriers (4, 41b, 42b) at the portion where the outer first and second fixing parts (5b1, 5b2) face each other and are bent. The stress value was 12.084 MPa and the temperature was -59.025°C. These values are compared to the YY direction stress value of the bent portion of the secondary barrier of the existing liquefied gas storage tank of about 66.8984 MPa and the temperature of about -135.857°C, compared to the secondary barrier (4, 41b) according to this embodiment. , 42b), it can be seen that the stress is much less, which means that the influence of cold heat from cryogenic materials, such as damage due to low-temperature stress, is reduced in the secondary barriers (4, 41b, 42b) of this embodiment compared to the existing one.

Figure 17 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the eighth embodiment of the present invention.

The planar structure of the liquefied gas storage tank 1 of this embodiment may be composed of a combination of a plurality of planar blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 17. As shown, it may be composed of a combination of a plurality of corner blocks. These plurality of flat blocks may be connected to a plurality of corner blocks at the corners of the liquefied gas storage tank (1).

In the liquefied gas storage tank 1 of this embodiment, the configuration of the flat block is the same or similar to the configuration described above with reference to FIG. 1. That is, the flat block of the liquefied gas storage tank 1 of the present embodiment, as shown in FIG. 1, is located on a flat portion on the first or second side at different angles forming a storage space for accommodating the liquefied gas. It is arranged and fixes the flat primary barrier (2a) made of metal, and a flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a), and a flat provided on the outside of the flat primary insulating wall (3a). It may include a secondary barrier (41a) and a flat secondary insulation wall (5a) disposed outside the flat secondary barrier (41a).

Accordingly, detailed description of the planar block configuration of the liquefied gas storage tank 1 is omitted here to avoid redundant description. Hereinafter, the configuration of the corner block of the liquefied gas storage tank 1 of this embodiment will be described in detail with reference to FIGS. 1 and 17.

As shown in Figures 1 and 17, the liquefied gas storage tank (1) includes a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed outside the primary insulation wall (3) and a secondary insulation wall (5) disposed outside the secondary barrier (4). The liquefied gas storage tank (1) can be supported on the hull (7) by mastic (6) installed between the secondary insulation wall (5) and the hull (7).

In the above, the primary barrier (2) may be composed of a flat primary barrier (2a) of a flat block and a corner primary barrier (2b) of a corner block, and the primary insulating wall (3) may be a flat primary insulating wall of a flat block. It may be composed of (3a) and the corner primary insulation wall (3b) of the corner block, and the secondary barrier (4) may be composed of the flat secondary barrier (41a) of the flat block and the corner secondary barrier (41b) of the corner block. The secondary insulation wall 5 may be composed of a flat secondary insulation wall 5a of a flat block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 may be the same or similar in the plane block and the corner block.

In the above, the secondary barrier 4 of the flat block and the corner block is a flat secondary barrier 41a arranged adjacent to or adjacent to the flat block when a plurality of planar blocks or a plurality of corner blocks are arranged adjacent to each other. It may include a flat connection barrier (42a) or a corner connection barrier (42b) connecting the corner secondary barrier (41b).

As shown in FIG. 17, the corner portion of the liquefied gas storage tank 1 according to the eighth embodiment of the present invention may be formed by a combination of a plurality of corner blocks.

The corner block of the liquefied gas storage tank (1) is disposed at the corner where the first and second surfaces at different angles meet, forming a storage space for accommodating the liquefied gas, and has a corner primary barrier (2b) made of metal. ) and a corner primary insulation wall (3b) disposed on the outside of the corner primary insulation wall (2b), a corner secondary barrier (41b) provided on the outside of the corner primary insulation wall (3b), and a corner secondary barrier. It may include a corner secondary insulation wall (5b) disposed on the outside of (41b).

The corner primary barrier 2b is disposed at a corner where first or second surfaces at different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic substance, and may be made of a metal material. The corner primary barrier (2b), together with the corner secondary barrier (41b), can prevent liquefied gas from leaking to the outside. The corner primary barrier 2b of this embodiment is basically the same or similar to the first embodiment described above, so detailed description is omitted here.

The corner primary barrier (2b) may be fixed to the barrier fixing member (21b).

The barrier fixing member 21b is made of metal and can be installed on the upper part of the corner primary insulation wall 3b. In the case of the corner primary insulation wall (3b), a plurality of corner primary insulation walls (5b) may be arranged along the sides of the corner portion, and accordingly, the barrier fixing member (21b) is located on each of the plurality of corner primary insulation walls (3b). Can be installed independently.

The corner primary insulation wall (3b) is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the corner primary insulation wall (2b) and the corner secondary barrier It can be installed between the barriers 41b.

The corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and consists of a corner primary insulation material (32b) fixed to the corner secondary barrier (2b), and a corner primary insulation material (32b). It may include an inner primary plywood (31b) disposed on the inside, forming a step with the corner primary insulation material (32b), and to which the corner primary barrier (2b) is fixed.

The corner primary insulation wall (3b), in which the inner primary plywood (31b) and the corner primary insulation material (32b) are sequentially laminated, may be arranged in plural numbers along the sides of the corner portion on the corner secondary insulation wall (5b). .

In this embodiment, the corner primary insulation wall (3b) is described as being composed of the inner primary plywood (31b) and the corner primary insulation material (32b), but at least one of the above-described first to seventh embodiments Of course, it may be the same or similar to the corner primary insulation wall 3b according to the embodiment.

The plurality of corner primary insulation walls (3b) described above are arranged adjacent to each other on the corner secondary insulation wall (5b), so that filling of a separate insulation material such as glass wool is omitted between the plurality of corner primary insulation walls (3b). , it can be arranged by minimizing the distance between the plurality of corner primary insulation walls (3b).

When the plurality of corner primary insulation walls (3b) are arranged in this way, a step space is created between the corner primary insulation material (32b) and the inner primary plywood (31b) forming the step. The corner block of this embodiment includes an inner first packing material (3b4) that is filled in the step space of the corner primary insulating walls (3b) arranged adjacent to each other and on which the corner primary barrier (2b) is seated.

The inner first packing material 3b4 may be polyurethane foam or glass wool.

The plurality of corner primary insulation walls (3b) are a part of the corner block together with the corner secondary barrier (41b) and the corner secondary insulation wall (5b), and are the entirety of the plurality of corner primary insulation walls (3b) forming the corner block. The width may be smaller than the width of the corner secondary insulation wall 5b, which is another component of the corner block. As a result, a portion of the corner secondary barrier 41b may be exposed to the outermost side of the plurality of corner primary insulation walls 3b. When a plurality of corner blocks are arranged adjacently along the side of the corner, the space between the outermost corner primary insulation walls (3b) arranged adjacent to each other, that is, the space where the corner secondary barrier (41b) is exposed, A corner connection insulation wall (34b) may be installed.

The corner connection insulation wall (34b) is disposed between the neighboring outermost corner primary insulation walls (3b) when corner blocks are arranged adjacent to each other, and is made of a corner connection insulation ( 341b) and the corner connecting plywood 342b may be provided in a laminated form and have the same or similar thickness as the corner primary insulation wall 3b.

This corner connection insulation wall (34b) is a corner connection barrier (42b) that creates a space between the corner secondary insulation walls (5b) arranged adjacent to each other when a plurality of corner blocks are arranged adjacent to each other along the side of the corner portion. It is installed to seal and block heat intrusion from the outside.

In this way, when a plurality of corner blocks are arranged adjacent to each other along the corner, there is a space between the corner connection insulation material (42b) and the corner primary insulation material (32b) and between the corner connection plywood (342b) and the inner primary plywood (31b). This is created, and the construction of the corner primary insulation wall (3b) can be completed by filling this space with the inner second packing material (3b5) on which the corner primary barrier (2b) is seated.

The inner second packing material 3b5 may be polyurethane foam or glass wool.

The corner secondary barrier (41b) can be installed between the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and together with the corner primary barrier (2b) can prevent liquefied gas from leaking to the outside. You can.

The corner secondary barrier (41b) is a part of the corner block along with the corner primary insulation wall (3b) and the corner secondary insulation wall (5b), and when the corner blocks are placed adjacent to each other, the neighboring corner secondary barrier (41b) Can be connected by sealing through the corner connection barrier (42b).

The corner connection barrier 42b can connect the neighboring corner secondary barrier 41 exposed to the outside when corner blocks are placed adjacent to each other, and a corner connection insulation wall 34b can be installed on the top.

The corner secondary insulation wall (5b) may be composed of an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). The corner secondary insulation wall (5b) is fixed to the inside of the first and second surfaces, respectively, and includes an inner secondary plywood (51b), a corner secondary insulation material (52b) on the outside of the corner secondary barrier (2b), The outer secondary plywood 53b may be configured in a sequentially stacked structure.

When a plurality of corner blocks are arranged adjacent to each other along the side of the corner portion, the space created between the corner secondary insulation walls 5b arranged adjacent to each other can be filled with the outer packing material 5b4.

The outer packing material (5b4) may be polyurethane foam or glass wool.

The corner secondary insulation wall 5b of this embodiment may be the same or similar to the corner secondary insulation wall 5b according to at least one of the above-described first to seventh embodiments, and herein, To avoid redundant explanations, detailed explanations are omitted.

Through this, in this embodiment, a plurality of corner primary insulation walls (3b) including the corner primary insulation material (32b) and the inner primary plywood (31b) forming a step are disposed on the corner secondary insulation wall (5b), By configuring the neighboring corner primary insulation materials (32b) to be arranged adjacently, not only does it facilitate the installation and handling of the barrier fixing member (21b) through the step portion between the inner primary plywood (31b) arranged adjacently, Since the packing material 3b4 only needs to be placed on the stepped portion, the consumption of the packing material can be reduced.

Figure 18 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the ninth embodiment of the present invention, Figure 19 is a side view for explaining the unit upper block constituting the upper block of Figure 18, and Figure 20 is an exploded view of the unit upper block of FIG. 19, FIG. 21 is a view for explaining the process of assembling the unit upper block of FIG. 20, and FIG. 22 is a side view for explaining the upper connection block of FIG. 18.

As shown in FIG. 18, the corner portion of the liquefied gas storage tank 1 according to the ninth embodiment of the present invention may be formed by a combination of a plurality of corner blocks (CB). The primary structure of the corner block (CB) is a lower block (LB) fixed to the hull 7 and made of a single board, and a plurality of unit upper blocks bonded to the lower block (LB). (UB1, UB2, UB3, UB4) connects the upper block (UB), which is arranged side by side, adjacent to each other, and the lower block (LB), which is placed next to each other, and 2 exposed between the upper blocks (UB) which are placed next to each other. It may be composed of an upper connection block (UBB) that is bonded to the car barrier (4). The upper block (UB) of this embodiment is described as being made up of four first to fourth unit upper blocks (UB1, UB2, UB3, UB4) arranged side by side adjacent to each other, but is not limited to this and includes at least two or more units. Of course, it can be made of an upper block.

The corner block (CB) of this embodiment, like the above-described first to eighth embodiments, is a corner portion where the first and second surfaces at different angles form a storage space for accommodating liquefied gas. Although not shown, a corner primary barrier (2b) made of metal is formed on the upper block (UB) and upper connection block (UBB) as described above with the corner block (CB) disposed. Thus, the corner portion of the liquefied gas storage tank (1) having an accommodating space for sealing and accommodating the liquefied gas, which is a cryogenic material, is completed.

The liquefied gas storage tank 1 of this embodiment is completed by connecting the corner block (CB) formed at the corner portion and the flat block formed at the flat portion, where the flat block is as shown in the above-described first embodiment. It may be a flat block with the structure shown in 1, but is not limited thereto.

In addition, the corner block (CB) of this embodiment will be described in detail below by dividing it into a lower block (LB), an upper block (UB), and an upper connection block (UBB), but it is not limited thereto, and is not limited to the above-described first embodiment. Of course, it may be the same or similar to the structure of any one of the through eighth embodiments.

As shown in FIG. 18, the lower block (LB) may have an upper block (UB) and an upper connection block (UBB) installed on its upper surface, and is a corner secondary barrier bonded to the lower surface of the upper block (UB). (41b) and the neighboring corner secondary barrier (41b), which is exposed to the outside because the upper block (UB) is not installed when the lower block (LB) is placed adjacent to it, is bonded to the lower surface of the upper connection block (UBB) It can be composed of a corner connection barrier (42b), an inner secondary plywood (51b), a corner secondary insulation material (52b), and a corner secondary insulation wall (5b) including an outer secondary plywood (53b). there is.

The lower block LB of this embodiment may be identical or similar to the configuration according to at least one of the above-described first to eighth embodiments, and therefore, detailed description is provided here to avoid redundant description. omit.

The upper block UB includes a plurality of unit upper blocks, for example, first to fourth unit upper blocks UB1, UB2, UB3, and UB4, arranged side by side adjacent to each other, so that the lower surface is on the lower block LB. It is bonded to and the upper surface can be fixed to the barrier fixing member (21b).

Each of the first to fourth unit upper blocks UB1, UB2, UB3, and UB4 has corner 1 disposed on the outside of the barrier fixing member 21b, as shown in FIGS. 18, 19, 20, and 21. It has a basic structure consisting of a thermal barrier wall (3b).

In the above, the corner primary insulation wall (3b) is provided on the inside of the first and second surfaces, respectively, and the inner primary plywood (31b) and corner primary insulation material (32b) are provided on the outside of the barrier fixing member (21b). ), the outer primary plywood (33b) may include an inner first fixing part (3b1) and an inner second fixing part (3b2) composed of a sequentially stacked structure. The first inner fixing part 3b1 and the second inner fixing part 3b2 may be provided symmetrically with respect to the direction ED in which the corner portions are equally divided.

In addition, the corner primary insulation wall 3b is installed in the corner space between the inner first fixing part 3b1 and the inner second fixing part 3b2, and may include an inner bent part 3b3 made of an insulating material. there is.

As shown in FIGS. 19, 20, and 21, the inner bent portion 3b3 of this embodiment is different from the existing integrated inner bent portion by having an inner first half-bended portion 3b3' and an inner second half-bend. It can be divided into parts (3b3").

That is, the inner first half-bent portion 3b3' and the inner second half-bent portion 3b3" have a triangular shape obtained by symmetrically cutting the existing integrated inner bend along the direction (ED) in which the corner portion is equally divided. You can have

The triangular-shaped inner first half-bent portion 3b3' has a side perpendicular to the corner connecting barrier 42b of the secondary barrier 4 and is connected to the inner first fixing portion by the first bonding portion 3b6. It can be bonded to the side of (3b1).

In addition, the triangular-shaped inner second half-bent portion 3b3" has a side perpendicular to the corner connecting barrier 42b of the secondary barrier 4 and is connected to the inner second fixing portion by the second bonding portion 3b7. It can be bonded to the side of (3b2).

The assembly process of the upper block (UB) of this embodiment described above is as follows.

First, an inner first fixing part (3b1), an inner second fixing part (3b2), an inner first half bending part (3b3'), and an inner second half bending part (3b3") separated into four pieces are prepared. do.

The inner first fixing part 3b1 and the inner first half-bent part 3b3' are bonded together using the first bonding part 3b6.

The inner second fixing part 3b2 and the inner second half-bent part 3b3" are bonded together using the second bonding part 3b7.

The inner first fixing part 3b1 bonded to the inner first half-bent part 3b3' is bonded to the secondary barrier 4 using an adhesive 10.

The inner second fixing part (3b2) bonded to the inner second half-bent part (3b3") is bonded to the secondary barrier (4) using an adhesive (10).

By inserting and installing the corner first inner packing material (3b8) in the space created between the inner first half-bent portion (3b3') and the inner second half-bent portion (3b3") by bonding to the secondary barrier (4), Complete assembly.

As described above, in the corner primary insulation wall 3b of the present embodiment, the inner first and second half-bent parts 3b3' and 3b3" are connected to the inner first and second highs by the first and second bonding parts 3b6 and 3b7. In the state of bonding to the top (3b1, 3b2), it can be assembled and installed at the corner portion. At this time, the outer primary plywood (33b) of the inner first and second fixing parts (3b1, 3b2) is adhesive (10). It can be fixed to the corner connection barrier (42b) of the secondary barrier (4), and the bottom of the inner first and second half bends (3b3', 3b3") horizontal to the corner connection barrier (42b) is at the corner. It is placed in a non-adhesive state with the connection barrier 42b.

In the assembled and installed state as described above, a space is inevitably created between the inclined surface of the inner first half-bent portion 3b3' and the inclined surface of the inner second half-bent portion 3b3", which face each other, and this space is created. In order to prevent the thermal convection phenomenon occurring through the corner first insulation wall (3b) of the present embodiment, the corner first inner packing material that seals the space between the inner first and second half bends (3b3', 3b3") (3b8) may be further included.

The corner first inner packing material 3b8 may be formed of a vacuum insulating material using glass wool as a main raw material, but is not limited to this, and may of course be formed of other insulating materials that can be used as a packing material.

In addition, the corner first inner packing material 3b8 has a positive tolerance so as to completely seal the space when inserted into the space between the first and second inner half bends 3b3' and 3b3". can be formed.

In this embodiment, the outer primary plywood (33b) of the inner first and second fixing parts (3b1, 3b2) must be in an adhesive state with the corner connecting barrier (42b) of the secondary barrier (4), and the inner first and second fixing parts (3b1, 3b2) must be in an adhesive state. , 2The bottom of the half-bent portion (3b3', 3b3") must be in a non-adhesive state with the corner connection barrier (42b), and the adhesive 10 must be non-adhesive while ensuring sufficient adhesive force by the adhesive 10 in the adhesive area. In order to prevent spread to the area, it is necessary to provide a squeeze-out confirmation means that can confirm the squeeze-out of the adhesive 10.

In this embodiment, as a squeeze-out confirmation means, a chamfer (CF) may be formed at a right-angled corner where the side and bottom surfaces of the inner first and second half-bent portions 3b3' and 3b3" meet.

As shown in FIG. 19, this chamfer (CF) is the outer primary plywood ( 33b) A space is formed on the side to visually confirm that the adhesive 10 is squeezed out.

The barrier fixing member 21b is made of metal and can be installed on the upper part of the corner primary insulation wall 3b.

As shown in FIGS. 18 and 19, the barrier fixing member 21b has an upper block UB made of the first to fourth unit upper blocks UB1, UB2, UB3, and UB4 along the side of the corner portion. After bonding on the lower block (LB), it is fixed to the inner first plywood (31b) forming the inner first fixing part (3b1) and the inner second fixing part (3b2), and the inner first fixing part (3b2) 3b1) and the inner second fixing part 3b2 can be fixed.

The barrier fixing member 21b may be independently installed on top of each of the first to fourth unit upper blocks UB1, UB2, UB3, and UB4.

Through this, in this embodiment, the inner first half-bent part 3b3' and the inner second fixing part are bonded to the inner bending part 3b3 of the corner primary insulation wall 3b to the inner first fixing part 3b1. By consisting of the inner second half-bent portion 3b3' bonded to (3b2), even if the inner first and second half-bent portions 3b3' and 3b3" expand or contract, the inner first fixing portion 3b1 and It is possible to block the thermal convection path between the inner first half-bent portion 3b3' and between the inner second fixing portion 3b2 and the inner second half-bent portion 3b3", so that the Thermal convection phenomenon can be prevented.

In addition, in this embodiment, the space between the inner first and second half-bent portions 3b3' and 3b3" is closed with a corner first inner packing material 3b8 having a positive tolerance, thereby forming the inner first and second inner packing materials 3b8. Even if the half-bent portions 3b3' and 3b3" expand or contract, the thermal convection path between the first and second inner half-bent portions 3b3' and 3b3" can be blocked, thereby preventing the thermal flow in the inner bent portion 3b3. The flow phenomenon can be prevented.

In addition, in this embodiment, by forming a chamfer (CF) at a right-angled corner where the side and bottom surfaces of the inner first and second half-bent portions 3b3' and 3b3" meet, the inner first and second fixing portions 3b1, When bonding the outer primary plywood (33b) of 3b2) to the corner connecting barrier (42b) of the secondary barrier (4) with adhesive (10), the adhesive (10) in the adhesive area is squeezed out into the non-adhesive area. This can be confirmed directly with the naked eye, preventing bonding defects.

The upper connection block (UBB) of this embodiment is bonded to the upper surface of the lower blocks (LB) disposed adjacent to each other, and can connect the lower blocks (LB). The upper connection block (UBB) is an upper block (UB) formed by arranging the first to fourth unit upper blocks (UB1, UB2, UB3, UB4) adjacent to each other and side by side, and an upper block (UB) disposed adjacent thereto. It can be installed in the exposed space in between.

As shown in FIGS. 18 and 22, the upper connection block (UBB) may be made of a corner connection insulation wall (34b) disposed on the outside of the barrier fixing member (21b).

The corner connection insulation wall (34b) of the upper connection block (UBB), together with the corner primary insulation wall (3b), blocks heat intrusion from the outside and withstands shock from the outside or shock from liquefied gas sloshing from the inside. It is designed so that it can be installed between the barrier fixing member (21b) and the corner connection barrier (42b).

In the above, the corner connection insulation wall 34b is provided on the inside of the first and second surfaces, respectively, and the corner first connection plywood 342b and the corner connection insulation material 341b are provided on the outside of the barrier fixing member 21b. ), the corner second connection plywood (343b) may include a corner first connection fixing part (34b1) and a corner second connection fixing part (34b2) configured in a sequentially stacked structure. The first corner connection fixing part 34b1 and the second corner connection fixing part 34b2 may be provided symmetrically with respect to the direction ED in which the corner portion is equally divided.

In addition, the corner connection insulation wall 34b is installed in the corner space between the corner first connection fixing part 34b1 and the corner second connection fixing part 34b2, and has a corner connection bending part 34b3 made of an insulating material. It can be included.

As shown in FIG. 22, the corner connection bent portion 34b3 of the present embodiment has a first corner half-bent portion 34b3' and a second corner half-bent portion 34b3", unlike the existing integrated inner bent portion. It can be divided into .

The corner first half-bent portion 34b3' has a side perpendicular to the corner connection barrier 42b of the secondary barrier 4 of the corner first connection fixing portion 34b1 by the first bonding portion 34b6. It can be bonded to the side.

In addition, the corner second half-bent portion 34b3" has a side perpendicular to the corner connection barrier 42b of the secondary barrier 4 and is connected to the corner second connection fixing portion 34b2 by the second bonding portion 34b7. ) can be bonded to the side of the.

The corner connection insulation wall 34b of the present embodiment may further include a second corner inner packing material 34b8 that seals the space between the first and second corner half bends 34b3' and 34b3".

Each of the corner first half-bent portion 34b3', the corner second half-bent portion 34b3", and the corner second inner packing material 34b8 of the above-described upper connection block UBB is the upper block UB described above. Only the reference numerals and names are different from the inner first half-bent portion (3b3'), the inner second half-bent portion (3b3"), and the corner first inner packing material (3b8), and may be structurally the same or similar. Therefore, detailed description is omitted here to avoid redundant description.

Figure 23 is a partial front view of a corner portion for explaining the liquefied gas storage tank according to the tenth embodiment of the present invention, and Figure 24 is a partial front view of the corner portion for explaining the liquefied gas storage tank according to the tenth embodiment of the present invention. It is a partially exploded perspective view, Figure 25 is a front view for explaining the integrated upper block of Figure 23, Figure 26 is a front view for explaining another embodiment of the integrated upper block of Figure 25, and Figure 27 is an integrated upper block of Figure 25 It is a side view, Figure 28 is a cross-sectional view cut along line A-A' of Figure 25, Figure 29 is a perspective view for explaining the upper connection block of Figure 23, and Figure 30 is a perspective view for explaining the upper connection block of Figure 23. FIG. 31 is a cross-sectional view taken along line B-B' of FIG. 30, FIG. 32 is a cross-sectional view illustrating another embodiment of the integrated upper block of FIG. 25, and FIG. 33 is a cross-sectional view taken along line B-B' of FIG. 30. It is an exploded view of the upper block, and Figures 34 to 37 show convection that varies depending on the structure of the corner primary insulation wall and the corner connecting insulation wall in the liquefied gas storage tank according to the tenth embodiment of the present invention and the liquefied gas storage tank according to the comparative example. This is a drawing to compare and explain the temperature of the path and secondary barrier.

As shown in FIGS. 23 and 24, the corner portion of the liquefied gas storage tank 1 according to the tenth embodiment of the present invention may be formed by a combination of a plurality of corner blocks (CB). The primary structure of the corner block (CB) is a lower block (LB) fixed to the hull 7 and made of a single board, and a lower block (LB) bonded on the lower block (LB). A secondary barrier (UUB) exposed between the integrated upper block (UUB), which is made of a single board with a width narrower than the front, left, and right widths of 4) It may be composed of an upper connection block (UBB) that is bonded to the upper connection block (UBB).

The corner block (CB) of this embodiment will be described in detail below by dividing it into a lower block (LB), a unified upper block (UUB), and an upper connection block (UBB). However, this embodiment may have the same or similar configuration compared to the above-described ninth embodiment or the above-described first to eighth embodiments, and in this case, detailed description will be omitted to avoid redundant description. do.

As shown in FIG. 23, the lower block (LB) may have an integrated upper block (UUB) and an upper connecting block (UBB) installed on its upper surface, and corner 2 bonded to the lower surface of the integrated upper block (UUB) When the secondary barrier (41b) and the lower block (LB) are placed adjacent to each other, they connect the neighboring corner secondary barrier (41b), which is exposed to the outside because the integrated upper block (UUB) is not installed, and the upper connection block (UBB) A corner secondary insulation wall (5b) consisting of a corner connection barrier (42b) bonded to the lower surface, an inner secondary plywood (51b), a corner secondary insulation material (52b), and an outer secondary plywood (53b). It can be done.

The lower block LB of this embodiment may be the same or similar to the configuration according to at least one of the above-described first to ninth embodiments, and herein, detailed description is provided to avoid redundant description. omit.

The integrated upper block (UUB) is bonded to the lower block (LB) and may be made of a single board having a narrower width than the front, rear, left and right widths of the lower block (LB).

Specifically, the unified upper block (UUB) can be made of a single board by integrating a plurality of unit upper blocks into one, compared to the existing upper block in which a plurality of unit upper blocks are arranged side by side adjacent to each other. Here, the existing upper block can be formed by arranging four first to fourth unit upper blocks (UB1, UB2, UB3, UB4) adjacent to each other and side by side, like the upper block (UB) of the ninth embodiment described above. , The integrated upper block (UUB) of this embodiment has the same front, rear, left and right widths of the existing upper block (UB) in which the first to fourth unit upper blocks (UB1, UB2, UB3, UB4) are adjacent to each other and arranged side by side. It can be made of a single board with a wide width.

In this embodiment, the integrated upper block (UUB) is described as being formed in an integrated size of four first to fourth unit upper blocks (UB1, UB2, UB3, and UB4), but is not limited to this and includes at least two units. Of course, the upper block can be formed in an integrated size.

The above-mentioned integrated upper block (UUB) is a barrier fixing member made of a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4), as shown in FIGS. 23, 24, 25, 26, and 27. The inner side is composed of a single board structure in which one inner primary plywood (31b), one corner primary insulation material (32b), and one outer primary plywood (33b) are sequentially stacked on the outside of (21b). It may be composed of a corner primary insulation wall (3b) including a first fixing part (3b1) and an inner second fixing part (3b2). The first inner fixing part 3b1 and the second inner fixing part 3b2 may be provided symmetrically with respect to the direction ED in which the corner portions are equally divided.

The inner first and second fixing parts 3b1 and 3b2 composed of the single board structure described above may be fixed by a plurality of unit barrier fixing members 21b1, 21b2, 21b3 and 21b4, as will be described later.

Through this, this embodiment has a plurality of unit upper blocks (UB1, UB2, UB3, By forming a unified upper block (UUB) in which UB4) is integrated into one, the thermal convection path occurring between the existing unit upper blocks (UB1, UB2, UB3, UB4) is omitted, thereby reducing the thermal convection phenomenon.

The corner primary insulation wall 3b is installed in the corner space between the inner first fixing part 3b1 and the inner second fixing part 3b2, and may include an inner bent part 3b3 made of an insulating material. there is.

As shown in FIGS. 25, 27, and 28, the inner bent portion 3b3 of this embodiment is about half the size of the inner first and second fixing portions 3b1 and 3b2 of the corner primary insulation wall 3b. It can have a reduced size and can form a symmetrical shape based on the direction (ED) of equally dividing the corner portion.

Hereinafter, the reduced-sized inner bent portion 3b3 will be described as being applied to an integrated upper block (UUB) in which a plurality of unit upper blocks (UB1, UB2, UB3, and UB4) are integrated into one, but is not limited to this and is applied to a plurality of unit upper blocks (UB1, UB2, UB3, UB4). Of course, it can also be applied to the existing upper block (UB) in which the unit upper blocks (UB1, UB2, UB3, UB4) are arranged side by side adjacent to each other.

Specifically, the inner bent portion 3b3, which has been reduced in size, has a height on both sides perpendicular to the corner connecting barrier 42b of the secondary barrier 4 on the inner side of the first and second surfaces, the inner first, Each of the second fixing parts (3b1, 3b2) has a height reduced to about half of the total height, for example, within the range of 40% to 60% of the total height of the first and second inner fixing parts (3b1, 3b2). You can.

As described above, as the size of the inner bent portion 3b3 is reduced, the side shapes of the first and second inner fixing portions 3b1 and 3b2 may vary.

Specifically, the first and second inner fixing parts 3b1 and 3b2 of this embodiment are provided symmetrically with respect to the direction ED for equally dividing the corner portions, but the amount of the inner bent part 3b3 is reduced in size. The first side in close contact with the side is perpendicular to the corner connection barrier 42b of the secondary barrier 4, and the second side extending inward (toward the storage space) from the vertical first side is in the division direction (ED). ) and can extend in the same direction.

As described above, in the corner primary insulation wall 3b of the present embodiment, the second side of the inner first fixing part 3b1 and the second side of the inner second fixing part 3b2 face each other, The outer primary plywood (33b) of the inner first and second fixing parts (3b1, 3b2) is fixed to the corner connecting barrier (42b) of the secondary barrier (4) by the adhesive (10), and the inner first and second fixing parts (3b1, 3b2) are fixed to the corner connecting barrier (42b) of the secondary barrier (4). 2 It can be assembled by inserting and installing the reduced-sized inner bent part 3b3 in the corner space created by the fixing parts 3b1 and 3b2.

In the assembled and installed state as described above, between the first sides of the first and second inner fixing parts 3b1 and 3b2 that are in close contact with both sides of the reduced size inner bent part 3b3, and the inner first and second fixing parts facing each other, A space is inevitably created between the second sides of the first and second fixing parts (3b1, 3b2), and in order to prevent thermal convection occurring through this space, the corner first insulation wall (3b) of this embodiment is located on the inner side. It may further include a corner inner packing material 3b8 that seals the space between the second sides of the first and second fixing parts 3b1 and 3b2.

The corner inner packing material 3b8 may be formed of a vacuum insulating material whose main raw material is glass wool, but is not limited thereto, and of course may be formed of other insulating materials that can be used as a packing material.

In addition, the corner inner packing material 3b8 is formed to have a positive tolerance so as to completely seal the space when inserted into the space between the second sides of the first and second inner fixing parts 3b1 and 3b2. It can be.

The corner inner packing material 3b8 described above may be configured to be inserted to a certain depth into the inner bent portion 3b3 of reduced size, as shown in FIGS. 32 and 33.

The inner bent portion 3b3 of this embodiment has a certain depth in the same direction as the division direction ED at the point where both sides meet so that the corner inner packing material 3b8 is inserted into the inner bent portion 3b3 to a certain depth. An insertion groove (SH) may be formed.

The insertion groove SH is formed in a direction corresponding to the corner side of the storage tank, and may have a depth of less than half of the thickness of the inner bent portion 3b3, but is not limited thereto.

Through this, the present embodiment not only reduces the space where thermal convection occurs (non-adhesion area between the inner bend and the secondary barrier at the corner) by reducing the size of the inner bent portion 3b3, but also reduces the thermal convection space. The first and second sides of the first and second inner fixing parts (3b1, 3b2), which can be considered paths, are bent, and the corner inner packing is formed between the second sides of the first and second inner fixing parts (3b1, 3b2). By forming the material 3b8, the shrinkage area due to temperature change is reduced compared to the existing inner bent portion formed at the same height as the first and second inner fixing parts 3b1 and 3b2, thereby reducing the thermal convection phenomenon.

Additionally, in this embodiment, the corner inner packing material 3b8 is inserted into the inner bent portion 3b3 to a certain depth, thereby further reducing the thermal convection phenomenon in the inner bent portion 3b3.

The inner bent portion 3b3, whose size is reduced according to this embodiment, may be provided with first protrusions PT1 on both sides, as shown in FIGS. 24 and 27.

The first protrusion PT1 may extend a certain length outside the space from the inner bent part 3b3 inserted into the corner space created by the first and second inner fixing parts 3b1 and 3b2.

The first protrusion PT1 has a cross-sectional shape similar to the inner bent portion 3b3, and the curved portion in contact with the corner connecting barrier 42b of the secondary barrier 4 is the curved portion of the inner bent portion 3b3. It extends on the same line, and both sides perpendicular to the corner connection barrier 42b of the secondary barrier 4 may extend to have a first step ST1 with both sides of the inner bent portion 3b3.

That is, the first protrusion PT1 of the present embodiment is formed to be smaller than the size of the inner bent portion 3b3 and has a first step ST1 with respect to the inner bent portion 3b3, so that the first protrusion PT1 has a smaller size than the inner bent portion 3b3. As a result, the tropical convection path forms a curved path, thereby preventing the thermal convection phenomenon, which will be described later.

As shown in FIGS. 23, 24, and 25, the integrated upper block (UUB) of this embodiment has a constant upper portion to prepare for the contraction and expansion stress of the corner primary insulation wall 3b having a single board structure. It may include a plurality of upper slits (SL1) formed in depth.

The upper slit (SL1) is half the thickness of the corner primary insulation wall (3b) forming the integrated upper block (UUB) in order to relieve as much as possible the contraction or expansion stress caused by the temperature applied to the corner primary insulation wall (3b). It may have a depth of less than or equal to, for example, a depth in the range of 30% to 50%.

The upper slit (SL1) penetrates the inner primary plywood (31b), which is the upper layer of the corner primary insulation wall (3b), and is formed to at least a part of the corner primary insulation (32b), which is the middle layer, thereby forming the corner primary insulation ( It is desirable to prepare for the contraction or expansion stress of 32b).

The above-mentioned upper slit (SL1) is formed to a depth corresponding to a thickness of less than half of the thickness of the corner primary insulation wall (3b), thereby maximizing the contraction or expansion stress due to the temperature applied to the corner primary insulation wall (3b). Not only can this be alleviated, but the thermal convection space can be reduced, and between the flat primary insulation wall (3a) of the flat block shown in FIG. 1 and the corner primary insulation wall (3b) of the corner block (CB) of the present embodiment. The transfer of cold air from the corner block (CB) to the flat block can be prevented by the installed insulation material (not shown).

The upper slit (SL1) of this embodiment is a plurality of units installed on the upper surface of the integrated upper block (UUB) of the corresponding portion of each of the plurality of unit upper blocks (UB1, UB2, UB3, UB4) forming the existing upper block (UB). It may be formed at a corresponding position between the unit barrier fixing members 21b1, 21b2, 21b3, and 21b4, and of course, it is not limited to this position and can be formed at any position spaced a certain distance away.

In addition, as shown in FIG. 26, the integrated upper block (UUB) of this embodiment is formed at a certain depth at the bottom to prepare for the contraction and expansion stress of the corner primary insulation wall 3b having a single board structure. It may include a plurality of lower slits (SL2).

The lower slit (SL2) is half the thickness of the corner primary insulation wall (3b) forming the integrated upper block (UUB) in order to relieve as much as possible the contraction or expansion stress caused by the temperature applied to the corner primary insulation wall (3b). It may have a depth of less than or equal to, for example, a depth in the range of 30% to 50%.

The lower slit (SL2) penetrates the outer primary plywood (33b), which is the lower layer of the corner primary insulation wall (3b), and is formed to at least a part of the corner primary insulation (32b), which is the middle layer, thereby forming the corner primary insulation ( It is desirable to prepare for the contraction or expansion stress of 32b).

The lower slit SL2 of this embodiment may be formed at a position crossing the upper slit SL1, but is not limited to this position and may be formed at any position spaced a certain distance apart.

Through this, in this embodiment, an upper slit (SL1) of a certain depth is formed in the upper part of the integrated upper block (UUB), and a lower slit of a certain depth is formed in the lower part of the integrated upper block (UUB) so as to be staggered with the upper slit (SL1). By forming (SL2), the contraction and expansion stresses of the integrated upper block (UUB) can be alleviated by the upper and lower slits (SL1, SL2).

In addition, the integrated upper block (UUB) of this embodiment is bonded to the upper part of the corner secondary barrier 4 with adhesive 10, and the bonded area is larger than that of the existing upper block, so the adhesive 10 is attached to the adhesive area in the adhesive area. In order to prevent the adhesive 10 from spreading to non-adhesive areas while ensuring sufficient adhesion, it is necessary to provide a squeeze-out confirmation means that can confirm the squeeze-out of the adhesive 10.

In this embodiment, as shown in FIGS. 24, 25, and 26, when the outer primary plywood (33b) is bonded to the secondary barrier (4) with the adhesive (10), it is connected to the non-bonded area. A plurality of first grooves are formed on the outer primary plywood 33b of the integrated upper block (UUB) as a means of confirming that the adhesive 10 is squeezed out and preventing the adhesive 10 from excessively penetrating into the non-adhesive area. (GV1) can be formed.

In the above, a plurality of non-adhesive areas may be set in the middle portion, including both edge portions of the outer primary plywood 33b.

Each of the plurality of non-adhesive areas may be set at regular intervals and widths in a direction perpendicular to the corner side of the storage tank. For example, a plurality of non-adhesive areas are installed on the upper surface of the integrated upper block (UUB) in the corresponding portion of each of the plurality of unit upper blocks (UB1, UB2, UB3, UB4) forming the existing upper block (UB). It can be set to a position corresponding to a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4), and of course, it is not limited to this position and can be set to an arbitrary position spaced a certain distance apart.

In this embodiment, setting a plurality of non-adhesive areas on the outer primary plywood 33b bonded to the secondary barrier 4 by the adhesive 10 means that the outer primary plywood 33b is existing. This is because, since it has a relatively large area, the bonding defect rate of the adhesive 10 can be lowered by partially bonding rather than bonding all parts with the adhesive 10.

A plurality of first grooves (GV1) may be formed in the outer primary plywood (33b) in a direction perpendicular to the corner side of the storage tank.

Specifically, the plurality of first grooves GV1 may be formed along both border portions of each of the plurality of non-adhesive areas.

When the plurality of non-adhesive areas described above are set at corresponding positions between the plurality of unit barrier fixing members 21b1, 21b2, 21b3, and 21b4, the plurality of first grooves GV1 are formed with the plurality of upper slits SL1 and Since they are arranged in a staggered manner, they can be advantageous in terms of mechanical strength compared to those arranged on the same line.

On the integrated upper block (UUB) configured as above, as shown in FIGS. 23, 24, 25, and 26, a barrier fixing member consisting of a plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4) (21b) can be installed. Hereinafter, the barrier fixing member 21b will be described as consisting of four 1st, 2nd, 3rd, and 4th unit barrier fixing members 21b1, 21b2, 21b3, and 21b4, but is not limited thereto.

The 1st, 2nd, 3rd, and 4th unit barrier fixing members (21b1, 21b2, 21b3, and 21b4) are each made of metal and are located side by side adjacent to each other on the upper part of the corner primary insulation wall (3b) forming the integrated upper block (UUB). It can be installed and bent at a predetermined angle on the inside of the first and second surfaces, for example, the same angle as the angle formed by the first and second surfaces at different angles forming a storage space for accommodating liquefied gas. Can be bent at any angle.

In this embodiment, the 1st, 2nd, 3rd, and 4th unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 may be installed on one integrated upper block (UUB).

That is, the integrated upper block (UUB) of this embodiment is a single board in which one inner primary plywood (31b), one corner primary insulation material (32b), and one outer primary plywood (33b) are sequentially stacked. Since it is composed of a structure, the 1st, 2nd, 3rd, and 4th unit barrier fixing members (21b1, 21b2, 21b3, 21b4) are arranged and installed side by side on one inner primary plywood (31b), while the upper part of the plurality of units In the case of the existing upper block (UB) composed of blocks (UB1, UB2, UB3, UB4), there is a structural difference in that each unit barrier fixing member is installed independently in each unit upper block.

Each of the 1st, 2nd, 3rd, and 4th unit barrier fixing members (21b1, 21b2, 21b3, and 21b4) can be arranged at intervals considering the contraction and expansion stresses of the corner primary insulation wall (3b), and the number of arranged may vary depending on the size of the unified upper block (UUB) made of a single board.

In addition, the first, second, third, and fourth unit barrier fixing members (21b1, 21b2, 21b3, and 21b4) have the plurality of upper slits (SL1) described above as the first, second, third, and fourth unit barrier fixing members (21b1, When formed at a corresponding position between 21b2, 21b3, and 21b4), it may be linked to the contraction or expansion of the corner primary insulation material (32b).

Generally, the barrier fixing member is provided with a reinforcing member such as a stiffener along the edge of the back surface to secure the upper block (UB) by holding the upper part of the corner primary insulation wall. According to this embodiment, In the case of the 1st, 2nd, 3rd, and 4th unit barrier fixing members (21b1, 21b2, 21b3, 21b4), since they are disposed on one inner primary plywood (31b) with a flat top, the back surface must be flat.

Accordingly, each of the 1st, 2nd, 3rd, and 4th unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 is corner 1 using a plurality of coupling members 211b provided on the back, as shown in FIG. 28. It can be installed on top of the thermal barrier wall (3b). The coupling member 211b may be made of a stud bolt and a nut.

Hereinafter, the inner first fixing part (3b1) and the inner second fixing part are composed of an integrated upper block (UUB) using the 1st, 2nd, 3rd, and 4th unit barrier fixing members (21b1, 21b2, 21b3, and 21b4), respectively. Explain the assembly process for fixing (3b2). Since each of the first, second, third, and fourth unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 is configured identically, the first unit barrier fixing member 21b1 will be described below as an example.

The first assembly process involves connecting the outer primary plywood (33b) of the inner first and second fixing parts (3b1, 3b2) having a plurality of first holes (81) to an inner first plywood (33b) having a plurality of second holes (82). The inner side of the first and second fixing parts (3b1, 3b2) is bonded to the outer surface of the corner primary insulation material (32b) of the first and second fixing parts (3b1, 3b2) and has a plurality of third holes (83). The primary plywood (31b) is bonded to the inner surface of the corner primary insulation material (32b) having a plurality of second holes (82) to complete the assembly of the inner first and second fixing parts (3b1, 3b2). , insert the corner inner packing material 3b8 into the space between the first and second inner fixing parts 3b1 and 3b2. Here, in the case of the corner inner packing material 3b8, it is fixed using the coupling member 211b in a state in which it is installed by pressing between the first and second inner fixing parts 3b1 and 3b2 in the secondary assembly process to be described later, ( +) Tolerance can be maintained.

Here, the first, second, and third holes (81, 82, and 83) may be formed on an extension line at a position corresponding to each of the plurality of coupling members (211b) provided in the first unit barrier fixing member (21b1). . The first and second holes (81, 82) have the same size and have a communicating hole shape by bonding the outer primary plywood (33b) and the corner primary insulation material (32b), and foam is placed in these communicating holes. It can be sealed by inserting the plug 9, and the third hole 83 can be formed to a size into which the coupling member 211b can be inserted.

In the secondary assembly process, the outer primary plywood (33b), the corner primary insulation material (32b), and the inner primary plywood (31b) are bonded together, and a plurality of pieces formed on the inner primary plywood (31b) are bonded together. The first unit barrier fixing member (21b1) is brought into close contact with the upper surface of the inner primary plywood (31b) so that the plurality of coupling members (211b) are inserted into the third hole (83).

In the third assembly process, the first unit barrier fixing member 21b1 is connected to the inner primary ply by bolting the coupling member 211b through the communication hole formed by the plurality of first and second holes 81 and 82. Ensure that it is fixed to the upper surface of the wood (31b).

In the fourth assembly process, the first unit barrier fixing member (21b1) is fixed to the inner first plywood (31b), and the form is placed in the communication hole formed by the plurality of first and second holes (81, 82). Insert the plug (9). Here, the foam plug 9 has a size corresponding to the communication hole and may be made of the same or similar material as the corner primary insulation material 32b.

Afterwards, the inner first fixing part (3b1) and the inner second fixing part formed by a structure in which the outer primary plywood (33b), the corner primary insulation material (32b), and the inner primary plywood (31b) are bonded together. The assembly process of the integrated upper block (UUB) is completed by inserting the inner bent part (3b3) of reduced size into the corner space between (3b2).

As described above, the integrated upper block (UUB) of this embodiment includes an outer primary plywood 33b having a plurality of first holes 81, and a corner primary insulation material having a plurality of second holes 82. 32b) and the inner primary plywood (31b) having a plurality of third holes (83) are first bonded, and then the first, second, third, and fourth unit barrier fixing members (21b1, 21b2, 21b3, 21b4) are bonded together. It has a structure that allows bolting.

In this embodiment, the reduced-sized inner bent portion 3b3 is described as being installed at the end of the assembly process, but of course, it can be installed between the first assembly process and the second assembly process.

As shown in Figure 28, a corner outer packing material 5b5 can be inserted and installed in the space between the outer first fixing part 5b1 and the outer second fixing part 5b2, and a plywood filler of a certain length ( PF).

As shown in FIG. 23, the upper connection block (UBB) of this embodiment is bonded to the upper surface of the lower blocks (LB) disposed adjacent to each other, so that the lower blocks (LB) can be connected.

The upper connection block (UBB) has the same structure and is adjacent to the integrated upper block (UUB), which has a single board structure in which the existing first to fourth unit upper blocks (UB1, UB2, UB3, UB4) are integrated. It can be installed in the space exposed between the deployed integrated upper blocks (UUB).

The upper connection block (UBB) may be made of a corner connection insulation wall (34b) disposed on the outside of the barrier fixing member (21b).

The corner connection insulation wall 34b of the upper connection block (UBB), together with the corner primary insulation wall 3b of the integrated upper block (UUB), blocks heat intrusion from the outside and protects against shock from the outside or liquefied gas from the inside. It is designed to withstand the impact caused by sloshing, and can be installed between the barrier fixing member (21b) and the corner connection barrier (42b).

As shown in FIGS. 29 and 30, these corner connection insulation walls (34b) are provided on the inside of the first and second surfaces, respectively, and have a corner first connection plywood on the outside of the barrier fixing member (21b). (342b), a corner first connection fixing part (34b1) and a corner second connection fixing part (34b2) composed of a structure in which a corner connection insulation material (341b) and a corner second connection plywood (343b) are sequentially stacked. can do.

In this embodiment, the corner connection insulation wall 34b of the upper connection block (UBB) is different from the corner primary insulation wall 3b of the above-described integrated upper block (UUB) only in the reference numeral and size. , may be structurally identical or similar.

The corner connection insulation wall 34b is installed in the corner space between the corner first connection fixing part 34b1 and the corner second connection fixing part 34b2, and has a corner connection bending part 34b3 made of an insulating material. It can be included.

The corner connection bent portion 34b3 of this embodiment may have the same or similar shape as the inner bent portion 3b3 of the corner primary insulation wall 3b, as shown in FIGS. 29 and 30, and thus the corner The side shapes of the first connection fixing part 34b1 and the corner second connection fixing part 34b2 may also be the same or similar to the side shapes of the inner first and second fixing parts 3b1 and 3b2. A corner connection bend part 34b3 of reduced size may be inserted and installed in the corner space created by the first and second corner connection fixing parts 34b1 and 34b2 having the above-described side shapes.

That is, the corner connection bent portion 34b3 has a height on both sides perpendicular to the secondary barrier 4 that is reduced from the overall height of each of the first and second corner connection fixing portions 34b1 and 34b2, for example. For example, the height of both sides of the corner connection bending portion 34b3 may be within a range of 40% to 60% of the total height of the first and second corner connection fixing portions 34b1 and 34b2, respectively.

In addition, a corner inner packing material (34b4) is inserted and installed in the space between the first and second corner connection fixing parts (34b1 and 34b2), and the corner inner packing material (34b4) is connected to the inner first and second fixing parts (3b1 and 3b2). ) may be the same or similar to the corner inner packing material (3b8) inserted and installed in the space between.

That is, compared to the integrated upper block (UUB), the upper connection block (UBB) has a different size in the horizontal direction from the corner side of the storage tank, and includes a corner connection insulation wall 34b, a corner connection bending portion 34b3, Each of the corner inner packing materials (34b4) may be the same or similar to the corner primary insulation wall (3b), inner bent portion (3b3), and corner inner packing material (3b8) of the integrated upper block (UUB), so redundant description is provided here. To avoid this, detailed explanations are omitted.

Through this, this embodiment not only reduces the space where thermal convection occurs (non-adhesion area between the corner connection bend and the secondary barrier at the corner) by reducing the size of the corner connection bend 34b3, By forming the corner inner packing material (34b4) in the space between the first and second corner connection fixing parts (34b1 and 34b2), which can be said to be a thermal convection path, the same packing material as the first and second corner connection fixing parts (34b1 and 34b2) is formed. Compared to existing corner joints formed by height, the area affected by temperature changes is reduced, thereby reducing the thermal convection phenomenon.

In addition, in this embodiment, the corner inner packing material 34b4 is inserted to a certain depth into the corner connecting bent portion 34b3, thereby further reducing the thermal convection phenomenon in the corner connecting bent portion 34b3.

As shown in FIGS. 29 and 30, the corner connection bent portion 34b3 of reduced size according to this embodiment may be provided with second protrusions PT2 on both sides.

The second protrusion PT2 may extend a certain length outside the space from the corner connection bent portion 34b3 inserted into the corner space created by the first and second corner connection fixing portions 34b1 and 34b2.

The second protrusion PT2 has a cross-sectional shape similar to that of the corner connection bend 34b3, and the curved portion in contact with the corner connection barrier 42b of the secondary barrier 4 is the corner connection bend 34b3. It extends on the same line from the curved portion, and both sides perpendicular to the corner connection barrier (42b) of the secondary barrier (4) extend to have a second step (ST2) with both sides of the corner connection bend (34b3). You can.

That is, the second protrusion PT2 of the present embodiment is formed to be smaller than the size of the corner connection bent portion 34b3 and has a first step ST1 with respect to the corner connection bent portion 34b3, thereby creating a second step ST2. ), the tropical convection path forms a curved path, preventing the thermal convection phenomenon, which will be described later.

The second protrusion PT2 provided on the corner connection bent portion 34b3 may be the same or similar to the first protrusion PT1 provided on the inner bent portion 3b3 described above, and is shown in FIGS. 23 and 24 As shown, when the upper connection block (UBB) is installed between the neighboring integrated upper blocks (UUB), it is in contact with the first protrusion (PT1) and is in contact with the inner side by the first and second protrusions (PT1 and PT2). A step space may be created between the first and second fixing parts (3b1, 3b2) and the first and second corner connection fixing parts (34b1, 34b2).

In this embodiment, the step space created by the first and second protrusions PT1 and PT2 is finished with a stuffing piece SP to prevent thermal convection from occurring.

As shown in FIGS. 23 and 24, the stuffing piece (SP) includes a second protrusion (PT2) provided on the corner connection bent portion (34b3) and a first protrusion (PT1) provided on the inner bent portion (3b3). It can be inserted into the step space created by .

The stuffing piece (SP) may have a shape corresponding to the shape of the step space and may be formed of the same or similar material as the inner bent portion (3b3) or the corner connection bent portion (34b3), for example, low-density polyurethane foam. It can also be formed of a vacuum insulating material using glass wool as a main raw material, but is not limited to this, and of course can be formed of other insulating materials that can be used as pieces.

Additionally, when the step space created by the first and second protrusions PT1 and PT2 is, for example, 20 mm, the stuffing piece SP may be formed to have a thickness of 30 mm so as to completely seal the step space.

With the stuffing piece (SP) inserted, the thermal convection path generated on both sides of the stuffing piece (SP) and the thermal convection path generated at the part where the first and second protrusions (PT1 and PT2) are in contact are curved paths. is achieved.

Through this, in this embodiment, a first protrusion (PT1) is provided on the inner bent portion (3b3) of a reduced size, and a second protrusion (PT2) is provided on the corner connection bent portion (34b3) of a reduced size, By closing the step space created by the first and second protrusions (PT1, PT2) with a stuffing piece (SP), the thermal convection path generated between the integrated upper block (UUB) and the upper connection block (UBB) has a protruding structure and The stuffing piece (SP) creates a curved path, thereby reducing thermal convection.

Meanwhile, in a state where the temperature of the primary barrier 2 is -196 degrees and the temperature of the hull 7 is 10 degrees, the inner bent portion 3b3 and the corner connection bent portion 34b3 are reduced in size as in the present embodiment. ) is applied and the existing size of the inner bend (3b3) and the corner connection bend (34b3) are applied. As a result of CFD analysis, in this embodiment, the heat flux is 8.73W/㎡, the average of the secondary barrier (4) The temperature was -90.15 degrees, the average temperature of the hull (7) was 8.79 degrees, and in the existing case, the heat flux was 12.95 W/㎡, the average temperature of the secondary barrier (4) was -145.19 degrees, and the average temperature of the hull (7) was It was 8.20 degrees. Considering this condensation, it was found that this embodiment was superior to the existing one.

In addition, the upper connection block (UBB) of this embodiment has a squeeze-out confirmation means that can check the squeeze-out of the adhesive 10 when bonded to the upper part of the corner secondary barrier 4 with the adhesive 10. It needs to be prepared.

In this embodiment, as shown in FIGS. 24, 29, and 31, when the corner second connection plywood 343b is bonded to the secondary barrier 4 with the adhesive 10, the non-bonded area As a means of confirming that the adhesive 10 is squeezed out, a second groove (GV2) can be formed in the corner second connection plywood (343b) of the upper connection block (UBB).

The second groove (GV2) is formed in the corner second connection plywood 343b, which is an adhesive area, in a horizontal direction with the corner side of the storage tank, and the adhesive 10 is applied to the corner connection bend 34b3, which is a non-adhesive area. It may be formed adjacent to the rear edge of the corner second connection plywood 343b so that it can be confirmed that it is squeezed out.

Through this, in this embodiment, a second groove (GV2) is formed in the corner second connection plywood (343b) of the upper connection block (UBB) connected to the corner connection barrier (42b) in a horizontal direction with the corner side of the storage tank. However, by forming it in the area adjacent to the rear edge of the corner second connection plywood 343b, which is the adhesive area, it can be directly confirmed with the naked eye that the adhesive 10 is squeezed out to the corner connection bend 34b3, which is the non-adhesive area. In addition, as the adhesive 10 is squeezed out and bonded beyond the second groove (GV2) to the non-adhesive section, the non-adhesive section at the corner is reduced, thereby increasing the load applied to the secondary barrier 4. By preventing this, defective bonding of the upper connection block (UBB) can be prevented.

Hereinafter, with reference to FIGS. 34 to 37, the convection path that varies depending on the structure of the corner block (CB) in the liquefied gas storage tank (1) according to this embodiment and the liquefied gas storage tank (1') according to the comparative example. And the resulting temperature difference is compared and explained. Here, Figure 34 (a) shows the corner block (CB) applied to the liquefied gas storage tank (1) according to this embodiment, and Figure 34 (b) shows the liquefied gas storage tank (1) according to the comparative example. ')'s corner block (CB) is shown applied.

The liquefied gas storage tank 1' according to the comparative example may be, for example, the liquefied gas storage tank of the above-described ninth embodiment shown in FIG. 18.

In the liquefied gas storage tank 1 according to this embodiment and the liquefied gas storage tank 1' according to the comparative example, the flat primary insulation wall 3a may have the same or different structure, but hereinafter, the flat primary insulation wall Regardless of the structure in (3a), the convection path and resulting temperature difference due to the structural difference in the corner block (CB) will be compared and explained.

Figures 35 (a) and Figure 36 show the first and second convection paths (CP1, CP2) and the first and second convection blocking paths (CBP1, CBP2) in the liquefied gas storage tank (1) according to this embodiment. It was done.

The first convection path (CP1) is between the inner bent part (3b3) and the secondary barrier (4), which is formed at half the height of the total height of the first and second inner fixing parts (3b1, 3b2), and the first corner , 2 It is a path corresponding to the non-adhesive area between the corner connection bend part 34b3 and the secondary barrier 4, which is formed at half the height of the total height of each of the connection fixing parts 34b1 and 34b2.

The second convection path CP2 is a path corresponding to the upper slit SL1 formed with a depth corresponding to less than half the thickness of the corner primary insulation wall 3b.

The first convection blocking path (CBP1) is a stuffing inserted into the step space formed by the first protrusion (PT1) provided on the inner bent portion (3b3) and the second protrusion (PT2) provided on the corner connection bent portion (34b3). This is a blocking path corresponding to a piece (SP).

The second convection blocking path (CBP2) is a corner inner packing material (3b8, 34b4) inserted into the space between the inner first and second fixing parts (3b1 and 3b2) and the corner first and second connecting fixing parts (34b1 and 34b2). ) is the blocking path corresponding to.

Figure 35(b) shows the third and fourth convection paths CP3 and CP4 in the liquefied gas storage tank 1' according to the comparative example.

The third convection path (CP3) is formed between the inner bent part (3b3) and the secondary barrier (4) and the first corner, which is formed at the same height as the overall height of the first and second inner fixing parts (3b1, 3b2), respectively. It is a path corresponding to the non-adhesive area between the corner connection bend part 34b3 and the secondary barrier 4, which is formed at the same height as the overall height of each of the two connection fixing parts 34b1 and 34b2.

As shown in FIGS. 34, 35, and 36, the first and second convection paths CP1 and CP2 of the liquefied gas storage tank 1 of the present embodiment are the third convection paths CP1 and CP2 of the liquefied gas storage tank 1' of the comparative example. , It can be seen that the convection area is reduced compared to the 4 convection paths (CP3, CP4).

In addition, as shown in (b) of Figure 35, in the case of the liquefied gas storage tank (1') according to the comparative example, convection currents between the upper primary barrier (2) and the lower secondary barrier (4) However, as shown in (a) of FIG. 35, in the case of the liquefied gas storage tank 1 of this embodiment, convection is blocked by the corner inner packing material 3b8, so the liquefied gas storage tank according to the comparative example ( Compared to 1'), less temperature decrease occurs in the secondary barrier 4 of the liquefied gas storage tank 1 of this embodiment.

Due to this difference in convection path, a temperature difference also occurs in the secondary barrier 4 of the liquefied gas storage tank 1 of the present embodiment and the liquefied gas storage tank 1' of the comparative example, as shown in Figures 36 and 37 (a) ), (b), and (c).

The temperature measurement conditions were measured by varying the positions of the first, second, and third temperature sensors (TL1, TL2, and TL3) with the temperature of the primary barrier (2) being -196 degrees and the temperature of the hull (7) being 10 degrees. Although not shown, a temperature sensor was attached and measured at the same location in the liquefied gas storage tank (1') of the comparative example.

36 and 36(a), at the position where the first temperature sensor TL1 is attached, the liquefied gas storage tank 1 of this example was measured at -43.4 degrees, and the liquefied gas storage tank of the comparative example was measured at -43.4 degrees. (1') was measured at -130.1 degrees.

As shown in Figures 36 and 36(b), at the position where the second temperature sensor TL2 is attached, the liquefied gas storage tank 1 of this example was measured at -66.5 degrees, and the liquefied gas storage tank of the comparative example was measured at -66.5 degrees. (1') was measured at -154.6 degrees.

36 and 36(c), at the position where the first temperature sensor TL1 is attached, the liquefied gas storage tank 1 of this example was measured at -80.3 degrees, and the liquefied gas storage tank of the comparative example was measured at -80.3 degrees. (1') was measured at -164.7 degrees.

As mentioned above, it can be seen that these results are due to the narrower and reduced convection path of the liquefied gas storage tank (1') of the present example compared to the liquefied gas storage tank (1') of the comparative example.

The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known techniques as another embodiment.

Although the present invention has been described in detail through specific examples, this is for the purpose of explaining the present invention in detail, and the present invention is not limited thereto, and can be understood by those skilled in the art within the technical spirit of the present invention. It would be clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Liquefied gas storage tank 2: Primary barrier
2a: Flat primary barrier 2b: Corner primary barrier
21b: Barrier fixing member 21b1: First unit barrier fixing member
21b2: Second unit barrier fixing member 21b3: Third unit barrier fixing member
21b4: 4th unit barrier fixing member 211b: coupling member
3: Primary insulation wall 3a: Flat primary insulation wall
31a: Flat primary plywood 32a: Flat primary insulation material
33a: Flat connection insulation wall 331a: Flat connection plywood
332a: Flat connection insulation 3b: Corner primary insulation wall
3b1: inner first fixing part 3b2: inner second fixing part
31b: Inner primary plywood 32b: Corner primary insulation material
33b: Outer primary plywood 3b12: Inner intermediate fixing part
31b12: Inside middle plywood 32b12: Corner middle insulation material
34b: Corner connection insulation wall 34b1: Corner first connection fixing part
34b2: Corner second connection fixing part 341b: Corner connection insulation material
342b: Corner first connection plywood 343b: Corner second connection plywood
34b3: Corner connection bend 34b3': Corner first half bend
34b3": Corner second half bend 34b4: Corner inner packing material
3b3: inner bent portion 3b3': inner first half bent portion
3b3": inner second half bend 3b31: insulation material
3b32: insulation material 3b33: outer insulation material
3b34: inner insulation 3b35: insulation
3b36: Insulation material 3b37: Vacuum insulation panel
3b4: inner first packing material 3b5: inner second packing material
3b6, 34b6: first bonding part 3b7, 34b7: second bonding part
3b8, 34b8: 1st and 2nd corner inner packing material 4: Secondary barrier
41a: Flat secondary barrier 42a: Flat connection barrier
41b: Corner secondary barrier 42b: Corner connection barrier
5: Secondary insulation wall 5a: Flat secondary insulation wall
51a: Flat secondary insulation 52a: Flat secondary plywood
5b: corner second insulation wall 5b1: outer first fixing part
5b2: Outer second fixing part 51b: Inner secondary plywood
51b1: Peripheral plywood 51b2: Inclined plywood
52b: Corner secondary insulation 53b: Outer secondary plywood
5b12: Outer intermediate fixing part 51b12: Outer intermediate plywood
52b12: outer intermediate insulation 53b12: inner intermediate insulation
5b3: Outer bend 5b31: Insulation material
5b32: Insulating material 5b4: Outer packing material
5b5: Corner outer packing material 6: Mastic
7: Hull 81: Hole 1
82: 2nd hole 83: 3rd hole
9: Foam plug 10: Adhesive
CB: Corner block CBP1: First convection blocking path
CBP2: Second convection blocking path CP1: First convection path
CP2: Second convection path CP3: Third convection path
CP4: 4th convection path CF1: 1st chamfer
CF2: Second chamfer ED: Dividing direction
GV1: 1st groove GV2: 2nd groove
LB: Lower block PF: Plywood filler
PT1: first protrusion PT2: second protrusion
SH: Insertion groove SL1: Upper slit
SL2: Lower slit SP: Stuffing piece
UB: upper block UB1: first unit upper block
UB2: 2nd unit upper block UB3: 3rd unit upper block
UB4: 4th unit upper block UBB: upper connection block
UUB: Integrated upper block ST1: 1st step
ST2: Second step SS: Step space
TL1: 1st temperature sensor TL2: 2nd temperature sensor
TL3: Third temperature sensor

Claims (11)

A liquefied gas storage tank including a corner block disposed at a corner where the first and second surfaces at different angles meet to form a storage space for accommodating liquefied gas,
The corner block is,
a lower block provided inside the first and second surfaces and made of a single board;
An integrated upper block made of a single board and bonded to the secondary barrier of the lower block;
An upper connection block bonded to the secondary barrier exposed between the integrated upper blocks disposed adjacently; and
It is installed on the upper surface of the integrated upper block and includes a barrier fixing member for fixing the primary barrier,
The integrated upper block is,
One outer primary plywood provided on the inside of the first surface and the second surface and bonded to the secondary barrier;
One corner primary insulation material laminated on the outer primary plywood; and
It consists of one inner primary plywood layered on the corner primary insulation material,
The barrier fixing member is,
A plurality of unit barrier fixing members are installed side by side adjacent to each other on one of the inner primary plywood,
The outer primary plywood is,
A plurality of first grooves are formed on the lower surface bonded to the secondary barrier,
The plurality of first grooves are,
A liquefied gas storage tank formed in a direction perpendicular to the corner side of the storage tank to ensure that the adhesive is squeezed out into the non-bonded area when bonding the outer primary plywood to the secondary barrier with adhesive. The method of claim 1, wherein each of the plurality of unit barrier fixing members,
A liquefied gas storage tank arranged at intervals considering the contraction and expansion stresses of one corner primary insulation material and bolted to the corner primary insulation material. The method of claim 1, wherein the integrated upper block is:
It includes a plurality of upper slits formed at a certain depth at the top,
The plurality of upper slits are,
A liquefied gas storage tank formed with a depth corresponding to a thickness of less than half of the thickness of the integrated upper block. The method of claim 3, wherein the plurality of upper slits are:
A liquefied gas storage tank formed through the inner primary plywood to at least a portion of the corner primary insulation material to prepare for contraction or expansion stress of the corner primary insulation material. The method of claim 3, wherein the plurality of upper slits are:
A liquefied gas storage tank formed at corresponding positions between the plurality of unit barrier fixing members so that the plurality of unit barrier fixing members are linked to contraction or expansion of the corner primary insulation material. The method of claim 1, wherein the integrated upper block is:
It includes a plurality of lower slits formed at a certain depth in the lower part,
The plurality of lower slits are,
A liquefied gas storage tank formed with a depth corresponding to a thickness of less than half of the thickness of the integrated upper block. The method of claim 6, wherein the plurality of lower slits are:
A liquefied gas storage tank formed through the outer primary plywood to at least a portion of the corner primary insulation material to prepare for contraction or expansion stress of the corner primary insulation material. The method of claim 1, wherein the integrated upper block is:
A plurality of upper slits formed at a certain depth at the top; and
It includes a plurality of lower slits formed at a certain depth in the lower part,
The plurality of upper slits and the plurality of lower slits are,
Liquefied gas storage tanks formed at opposite locations. delete The method of claim 3, wherein the non-adhesive area is:
A plurality of pieces are set in the middle portion, including both edge portions of the outer primary plywood,
Each of the plurality of non-adhesive regions is,
A liquefied gas storage tank set at regular intervals and widths in a direction perpendicular to the corner side of the storage tank, and set at a corresponding position between the plurality of unit barrier fixing members. The method of claim 10, wherein the plurality of first grooves are:
Formed along both border portions of the plurality of non-adhesive areas,
A liquefied gas storage tank disposed alternately with the plurality of upper slits.

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