KR20220139779A - 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 includes a corner block disposed at a corner in which first and second surfaces having different angles meet each other to form a storage space for accommodating liquefied gas. The corner block includes: lower blocks provided on inner sides of the first and second surfaces and formed as a single board; upper blocks bonded to the secondary barriers of the lower blocks; and upper connecting blocks provided on the upper surfaces of the lower blocks disposed to be adjacent to each other, and bonded to the secondary barriers to connect the lower blocks. The upper block includes: an inner first fixing part and an inner second fixing part provided on the inner sides of the first and second surfaces, respectively, bonded to the secondary barrier, and having a structure in which an inner primary plywood, a corner primary insulator, and an outer primary plywood are stacked; and an inner bent part installed in a corner space between the inner first fixing part and the inner second fixing part. The inner bent part includes: an inner first half-bent part coupled to a side surface of the inner first fixing part; an inner second half-bent part coupled to a side surface of the inner second fixing part; and a corner first inner packing inserted into the space between the inner first half-bent part and the inner second half-bent part. Therefore, the structure of the corner block can be improved so that the low-temperature burden, sloshing burden, and stress burden of the secondary barrier can be reduced.

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.

According to recent technology development, liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) is widely used to replace gasoline or diesel.

In addition, in ships that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), etc. Storage tanks (so-called "cargo holds") are installed for storing LNG in a cryogenic liquid state.

In addition, the liquefied gas storage tank may generate boil-off gas (BOG) due to intrusion of heat from the outside, and the natural vaporization rate (BOR), which is the vaporization rate of the boil-off gas through a thermal insulation design. It is a key technology in the design of the liquefied gas storage tank. In addition, since the liquefied gas storage tank is 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 at the corners forming a right angle or an obtuse angle in the liquefied gas storage tank, but also improves the insulation performance. Research is being actively conducted to reduce the stress.

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

A liquefied gas storage tank according to an 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 of different angles meet to form a storage space for accommodating the liquefied gas As such, the corner block includes a lower block provided inside the first and second surfaces and made of a single board, an upper block bonded to the secondary barrier of the lower block, and an upper surface of the lower block disposed adjacent to each other. is bonded to the secondary barrier and consists of an upper connection block connecting the lower blocks, wherein the upper block is provided on the inner side of the first surface and the second surface, respectively, and is bonded to the secondary barrier, An inner first fixing part and an inner second fixing part having a structure in which the inner primary plywood, the corner primary insulation material, and the outer primary plywood are stacked; and an inner bent portion installed in a corner space portion between the inner first fixing portion and the inner second fixing portion, wherein the inner bending portion includes an inner first half-bending portion coupled to a side surface of the inner first fixing portion ; an inner second half-bend portion coupled to a side surface of the inner second fixing portion; and a corner first inner packing material inserted and installed in a space between the inner first half-bend portion and the inner second half-bend portion.

Specifically, the inner first half-bend portion and the inner second half-bend portion may have a triangular shape in which the inner bent portion is symmetrically cut along a direction in which corner portions are equally divided.

Specifically, the inner first half-bend portion, the side perpendicular to the secondary barrier is bonded to the side surface of the inner first fixing portion by a first bonding portion, the inner second half-bend portion, the second A side surface perpendicular to the barrier wall may be bonded to a side surface of the inner second fixing unit by a second bonding unit.

Specifically, the corner first inner packing material may be formed to have a (+) tolerance so as to completely seal the space while being inserted into the space between the inner first half-bend part and the inner second half-bend part. can

Specifically, in the inner first and second half-bent portions, a chamfer is formed at a right angle corner where a bottom surface that is not bonded to the secondary barrier and a side surface of the inner first and second fixing portions meet, the chamfer is the inner When bonding the first and second fixing parts with an adhesive on the secondary barrier, it may be confirmed that the adhesive is squeezed out toward the inner first and second half-bend parts, which are non-adhesive regions.

Specifically, the upper block provides each of the inner first fixing part, the inner second fixing part, the inner first half-bending part, and the inner second half-bending part separated into four pieces, and the inner side The first fixing part and the inner first half-bend part are bonded by using a first bonding part, the inner second fixing part and the inner second half-bend part are bonded by bonding using a second bonding part, and the inner first half-bent part is bonded to each other. The inner first fixing portion bonded to the half-bend portion is bonded to the secondary barrier using an adhesive, and the inner second fixing portion bonded to the inner second half-folded portion is bonded using an adhesive. By bonding to the secondary barrier and bonding to the secondary barrier, the corner first inner packing material is inserted and installed in the space created between the inner first half-bend and the inner second half-bend to assemble can be done

Specifically, the upper connection block is provided on the inner side of the first surface and the second surface, respectively, and is bonded to the secondary barrier, and a corner first connection plywood, a corner connection insulation material, and a corner second connection plywood are laminated. A corner first connecting portion and a corner second connecting portion having a fixed structure; and a corner connection bent part installed in a corner space portion between the corner first connection fixing part and the corner second connection fixing part, wherein the corner connection bending part is a corner coupled to a side surface of the corner first connection fixing part a first half-bend; a corner second half-bend portion coupled to a side surface of the corner second connection fixing portion; and a corner second inner packing material inserted and installed in a space between the corner first half-bend part and the corner second half-bend part.

A liquefied gas storage tank and a ship having the same according to the present invention, by improving the structure of the corner block, it is possible to reduce the low-temperature burden, the sloshing burden and the stress burden of the corner secondary barrier.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, 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 composed of only plywood, but polyurethane By forming in a configuration in combination with the insulation of the foam, it is possible to improve the insulation performance compared to that consisting of only the conventional plywood, it is possible to reduce the weight, it is possible to reduce the cost.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, the corner block of the corner block connected to the first flat insulation wall of the flat block and the corner block connected to the flat second insulation wall of the flat block 2 By configuring the thickness of the insulating wall to be the same or similar, the thickness of the corner primary insulating wall is relatively thick compared to the existing one (however, the thickness of the corner secondary insulating wall is the thickness that can maintain the mechanical strength at a certain level), Corner 2 It is possible to reduce the low-temperature burden and sloshing burden on the vehicle barrier, prevent damage to the corner secondary barrier, and reduce the low-temperature load on the corner secondary barrier to prevent brittle fracture of the hull.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, the corner primary insulating wall is configured to be relatively thick compared to the existing one, thereby increasing the length of the part where the corner secondary barrier is non-adhesive to the corner secondary insulating wall In addition, the probability of damage to the corner secondary barrier including the corner connecting barrier can be further reduced due to the increase in the flexibility of the corner secondary barrier, and the corner secondary barrier can easily absorb hull deformation and reduce low temperature. The stress can also be further reduced.

In addition, the liquefied gas storage tank and the ship having the same according to the present invention are spaced apart by a predetermined interval between the inner first fixing part and the inner second fixing part respectively provided on the inside of the first surface and the second surface at different angles. and, by providing an inner intermediate fixing part between the inner first and second fixing parts, it is possible to alleviate the bending angle of the corner primary barrier by the inner intermediate fixing part, thereby reducing the sloshing burden in the corner primary barrier In addition, it is possible to increase the mechanical strength of the corner part.

In addition, the liquefied gas storage tank and the ship having 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 are respectively fixed to the first and second surfaces at different angles. And, by filling the chamfer with low-density polyurethane foam, it is possible to further increase the thermal insulation performance in the corner part by the low-density polyurethane foam.

In addition, the liquefied gas storage tank and the ship having the same according to the present invention form a step in the corners facing the first and second outer fixing parts fixed to the first and second surfaces at different angles, respectively. And, by filling the step portion with glass wool, the flexibility of the corner secondary barrier including the corner connecting barrier formed on the glass wool is improved, thereby further preventing damage to the corner secondary barrier.

In addition, the liquefied gas storage tank and the ship having the same according to the present invention are spaced apart from each other by a predetermined interval between the first and second outer fixing parts fixed to the first and second surfaces at different angles, By providing an outer intermediate fixing part between the outer first and second fixing parts, the existing 1 by the gap formed between the outer first fixing part and the outer intermediate fixing part and between the outer second fixing part and the outer intermediate fixing part. It is possible to prevent damage to the corner secondary barrier fixed to the outer fixing part by relieving contraction or expansion stress due to the temperature of the outer fixing part compared to the gap of the dog.

In addition, the liquefied gas storage tank and the ship having 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 are respectively fixed to the first and second surfaces at different angles. And, by installing the corner secondary barrier along the surface of the outer first and second fixing parts including the chamfer part, the corner secondary barrier is protruded and bent outward, and the length of the non-adhesive part to the corner secondary insulating wall increases. , due to the increase in the flexibility of the corner secondary barrier, the damage probability of the corner secondary barrier including the corner connecting barrier can be further reduced, and the corner secondary barrier can easily absorb hull deformation and further reduce low temperature stress can be

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, a corner primary insulating wall including an inner primary plywood forming a step with the corner primary insulating material is arranged in plurality on the corner secondary insulating wall, By configuring so that the corner primary insulation material is arranged adjacent to each other, it not only facilitates the installation and handling of the barrier fixing member through the stepped portion between the inner primary plywoods arranged adjacently, but also the packing material needs to be seated only on the stepped portion, Consumption of packing material can be reduced.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, are bonded to the inner first half-bend portion and the inner second fixed portion that are bonded to the inner bent portion of the corner primary insulating wall by bonding to the inner first fixing portion. It consists of the inner second half-bend and closes the space between the inner first and second half-bends with a corner inner packing material with a (+) tolerance, so that the thermal convection path at the inner bend is blocked and the thermal convection phenomenon is prevented. can be prevented

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, measure the size of the inner bent portion (or corner connection bent portion) of the corner first insulation wall, the inner first of the corner first insulation wall (or the corner connection insulation wall) , By reducing the size of the second fixing part (or the first and second connecting fixing parts of the corner) to half the size, the reduction area due to temperature change is reduced compared to the existing inner bending part formed at the same height as the inner first and second fixing parts Accordingly, the space (non-adhesive region between the inner bent portion and the secondary barrier in the corner portion) in which thermal convection occurs in the inner bent portion (or the corner connecting bent portion) is reduced, thereby reducing the thermal convection phenomenon.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, measure the size of the inner bent portion (or corner connection bent portion) of the corner first insulation wall, the inner first of the corner first insulation wall (or the corner connection insulation wall) , The space generated between the other half of the inner first and second fixing parts (or the first and second connecting parts of the corners) is reduced by about half compared to the size of the second fixing part (or the first and second connecting parts of the corner) Finish the part with the corner inner packing material, but by allowing the corner inner packing material to be inserted to a certain depth into the inside of the inner bent part (or the corner connecting bent part), the thermal convection phenomenon in the inner bent part (or the corner connecting bent part) is further reduced can do.

In addition, the liquefied gas storage tank according to the present invention and a ship having the same 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 adjacent to each other and side by side. By doing so, the thermal convection path generated between the existing unit upper blocks is omitted, thereby reducing the thermal convection phenomenon.

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

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, in the integrated upper block, 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 constituting the existing upper block, , by forming an upper slit of a certain depth in the upper part of the integrated upper block exposed between the plurality of unit barrier fixing members, and forming a lower slit of a certain depth in the lower part of the integrated upper block to cross the upper slit, thereby integrating by the upper and lower slits It is possible to relieve the contraction and expansion stress of the upper block. In addition, the liquefied gas storage tank according to the present invention and a ship having the same, form a plurality of first grooves in the vertical direction to the corner side of the storage tank in the outer primary plywood of the integrated upper block connected to the corner secondary barrier However, by forming on the borders on both sides of the non-adhesive area set in plural in the middle and adjacent to both edges of the outer primary plywood, the bonding area of the wide integrated upper block compared to the existing upper block is reduced. can be prevented

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

In addition, the liquefied gas storage tank according to the present invention and a ship having the same, form a second groove in the corner second connection plywood of the upper connection block connected to the corner connection barrier in the horizontal direction with the corner side of the storage tank, By forming in the portion adjacent to the rear edge of the corner second connecting plywood, it is possible to directly confirm that the adhesive in the adhesive area is squeezed out to the non-adhesive area, as well as the adhesive is squeezed out beyond the second groove to be non-adhesive. It can be bonded up to the section, thereby reducing the non-adhesive section of the corner portion, thereby increasing the load applied to the secondary barrier, thereby preventing the bonding failure of the upper connection block.

1 is a partial cross-sectional view of a plane portion for explaining a liquefied gas storage tank according to a first embodiment of the present invention.
2 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to the first embodiment of the present invention.
3 is a view showing a structural analysis result for a corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.
4 is a view showing another structural analysis result of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.
5 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a second embodiment of the present invention.
6 is a view showing the structural analysis results for the corner portion of the liquefied gas storage tank according to the second embodiment of the present invention.
7 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a third embodiment of the present invention.
8 is a view showing the structural analysis results of the corner portion of the liquefied gas storage tank according to the third embodiment of the present invention.
9 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a fourth embodiment of the present invention.
10 is a view showing the structural analysis results of the corner portion of the liquefied gas storage tank according to the fourth embodiment of the present invention.
11 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a fifth embodiment of the present invention.
12 is a view showing a structural analysis result of a corner portion of a liquefied gas storage tank according to a fifth embodiment of the present invention.
13 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a sixth embodiment of the present invention.
14 is a view showing a structural analysis result of a corner portion of a liquefied gas storage tank according to a sixth embodiment of the present invention.
15 is a cross-sectional view of a corner for explaining a liquefied gas storage tank according to a seventh embodiment of the present invention.
16 is a view showing a structural analysis result of a corner portion of a liquefied gas storage tank according to a seventh embodiment of the present invention.
17 is a partial front view of a corner portion for explaining a liquefied gas storage tank according to an eighth embodiment of the present invention.
18 is a partial front view of a corner portion for explaining a liquefied gas storage tank according to a ninth embodiment of the present invention.
19 is a side view for explaining a unit upper block constituting the upper block of FIG. 18 .
20 is an exploded view of the unit upper block of FIG. 19 .
FIG. 21 is a view for explaining a process of assembling the upper unit block of FIG. 20 .
22 is a side view for explaining the upper connection block of FIG. 18 .
23 is a partial front view of a corner portion for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention.
24 is an exploded perspective view of a part of a corner for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention.
25 is a front view for explaining the integrated upper block of FIG.
26 is a front view for explaining another embodiment of the integrated upper block of FIG.
Fig. 27 is a side view of the integrated upper block of Fig. 25;
28 is a cross-sectional view taken along line A-A' of FIG. 25 .
29 is a perspective view for explaining the upper connection block of FIG.
30 is a front view for explaining the upper connection block of FIG.
31 is a cross-sectional view taken along line B-B' of FIG. 30 .
32 is a cross-sectional view for explaining another embodiment of the integrated upper block of FIG.
33 is an exploded view of the integrated upper block of FIG.
34 to 37 are convection paths and secondary barriers that vary depending on the structure of the corner primary insulating wall and the corner connecting insulating 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. It is a diagram for comparing and explaining the temperature.

The objects, 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 the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

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

Also, terms including an ordinal number such as 1st, 2nd, 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 terms used throughout the specification, the term 'outside' means the outside of the tank with respect to the liquefied gas storage tank, and the term 'inside' means the inside of the tank with respect to the liquefied gas storage tank. reveal the

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. can be expressed as This can be applied to boil-off gas as well. In addition, for convenience, LNG may be used to encompass both NG (Natural Gas) in a liquid state as well as LNG in a supercritical state, etc. can

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

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

Although not shown, the ship provided with the liquefied gas storage tank (1) described below is a concept that encompasses offshore structures that float at a certain point on the sea and perform specific tasks in addition to merchant ships that transport cargo from the origin to the destination. let me know In addition, in the present invention, the liquefied gas storage tank (1) puts out that any type of tank for storing liquefied gas is included.

The liquefied gas storage tank 1 is provided on a ship and can store liquefied gas such as LNG, which is a cryogenic (about -160°C to -170°C) material, and may include a planar structure and a corner structure. For example, the transverse wall in the front-rear direction of the liquefied gas storage tank 1, the floor between the transverse walls, the vertical wall, and the ceiling may correspond to a planar structure. In addition, for example, a structure in which the lateral wall, the floor, the vertical wall, and the ceiling of the liquefied gas storage tank 1 meet may correspond to a corner structure. Here, the corner structure may include an obtuse corner structure or a right angle corner structure. When the thickness of the primary insulating wall 3 or the secondary insulating wall 5 is changed, a change in the obtuse-angled corner structure or the right-angled corner structure may be accompanied.

The planar structure of the liquefied gas storage tank 1, as shown in FIG. 1, may be made of a combination of a plurality of flat blocks, and the corner structure of the liquefied gas storage tank 1 is, as shown in FIG. , may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion of the liquefied gas storage tank (1).

As shown in Figures 1 and 2, the liquefied gas storage tank (1), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

That is, in the case of the conventional liquefied gas storage tank, the thickness of the first insulating wall in the flat block and the corner block is about 1/3 thinner than the thickness of the second insulating wall, in this embodiment, the flat block and the corner block The thickness of the primary insulating wall 3 and the thickness of the secondary insulating wall 5 are made to be the same or similar to each other, and the reason will be explained later.

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

As shown in Fig. 1, the flat block of the liquefied gas storage tank 1 is disposed on a flat portion on the first or second surface at different angles forming a storage space for accommodating the liquefied gas, and is made of a metal material. A flat primary insulating wall (3a) arranged on the outside of the flat primary barrier (2a) and fixing the flat primary barrier (2a) of ) and may include a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

The flat primary barrier (2a) is disposed on a flat portion on the first surface or the second surface at different angles to form an accommodating 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 a stainless steel material, but is not limited thereto. The flat primary barrier (2a) can prevent leakage of liquefied gas to the outside together with the flat secondary barrier (41a).

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

This flat primary barrier 2a seals the flat primary heat insulating 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 adjacently connected. .

The flat primary insulation wall (3a) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the flat primary barrier (2a) and the flat secondary It may be installed between the barriers 41a.

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

The flat primary plywood (31a) may be installed between the flat primary barrier (2a) and the flat primary insulating material (32a).

The flat primary insulating material 32a is to be formed of a material with excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. can

The flat primary insulating 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 insulating wall 3a.

The flat primary thermal insulation wall 3a is a part of a flat block together with the flat secondary barrier 41a and the flat secondary thermal insulation wall 5a. It may have a width smaller than the width of the in-flat secondary heat insulating wall 5a. Due to this, 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 portion between the adjacent flat primary insulation walls 3a, that is, in the space portion where the flat secondary barrier 41a is exposed. can be

The flat connection insulating wall 33a is disposed between the adjacent flat primary insulating walls 3a when the flat blocks are disposed adjacent to each other, and the flat connection plywood 331a identical to or similar to the flat primary insulating wall 3a. and the flat connection insulating material 332a may be provided in a stacked form, and have the same or similar thickness as the flat primary insulating wall 3a.

This flat connection insulating wall (33a), when arranging a plurality of flat blocks adjacent to each other, sealing the space portion generated between the adjacent flat secondary insulating walls (5a) adjacently arranged together with the flat connection barrier (42a) from the outside It is installed to play a role in blocking the intrusion of heat.

The flat secondary barrier 41a may be installed between the flat primary thermal insulation wall 3a and the flat secondary thermal insulation wall 5a, and prevents leakage of liquefied gas to the outside together with the flat primary barrier 2a. can

The flat secondary barrier 41a is a part of a flat block together with the flat primary thermal insulation wall 3a and the flat secondary thermal insulation wall 5a. may be connected by a flat connecting barrier (42a).

The flat connection barrier 42a may connect the neighboring flat secondary barriers 41 exposed to the outside when the flat blocks are disposed adjacently, and a flat connection insulation wall 33a may be installed thereon.

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

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

The flat secondary insulating material 51a is to be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. can

The flat secondary insulating 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 insulating wall 5a.

The flat secondary plywood (52a) may be installed between the flat secondary insulating material (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 insulating wall 33a encompassed by the flat primary insulating wall 3a is the thickness of the flat secondary insulating wall 5a and It can be configured to have the same or similar thickness. To be associated with this configuration, the flat connection insulating material 332a of the flat connection insulation wall 33a has a thickness of 90% to 110% of the flat secondary insulation material 51a, so that the flat connection of the flat connection insulation wall 33a The insulating material 332a may be configured to have the same or similar thickness as the flat secondary insulating material 51a.

That is, in the case of a conventional liquefied gas storage tank, the thickness of the first insulating wall in the flat block is about 1/3 thinner than the thickness of the second insulating wall, in this embodiment, the flat primary insulating wall ( The thickness of 3a) and the thickness of the flat secondary insulating wall 5a were configured to be the same or similar, and this is to prevent damage to the flat secondary insulating wall 41a due to low-temperature stress.

In general, the flat secondary barrier 41a and the flat secondary insulating wall 5a have a difference in the amount of self-contraction depending on the temperature to which they are exposed. In the case of the flat secondary barrier 41a and the flat secondary insulating wall 5a As the thickness of the flat connection insulating wall 33a decreases, it may be greatly affected by the cooling and heat of cryogenic liquefied gas. In addition, in this case, there is a problem in that the self temperature is lowered, the amount of shrinkage itself increases, and the stress at a low temperature increases, thereby increasing the risk of damage to the flat secondary barrier (41a). Such a problem may occur particularly in the flat connection barrier 42a that interconnects the flat secondary barrier 41a under the flat connection insulation wall 33a by bonding or the like. In the lower part of the flat connection insulating wall 33a, the flat connection barrier 42a is connected to the flat secondary barrier 41a of a plurality of flat blocks disposed adjacent to both ends, and the flat secondary insulating 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 close to each other.

In this embodiment, by forming the same or similar thickness of the flat primary thermal insulation wall 3a and the flat secondary thermal insulation wall 5a covering the flat connection insulation wall 33a, the flat insulation wall 33a covering the flat connection insulation wall 33a is formed. As the thickness of the primary insulating wall (3a) is relatively thick compared to the existing one, the cryogenic burden of the flat secondary barrier (41a) as well as the flat connection barrier (42a) in particular is reduced, and the flat secondary insulating wall (5a) As the thickness becomes relatively thin compared to the conventional one, 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 the portion where a plurality of flat blocks are arranged adjacent to each other is relatively lower than in the past.

With reference to FIG. 2, the corner part 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 made 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 numerical values.

As shown in FIG. 2, the corner block of the liquefied gas storage tank 1 is disposed at a corner where the first surface and the second surface of different angles form a storage space for accommodating the liquefied gas, and the metal A corner primary insulating wall (3b) arranged on the outside of the corner primary barrier (2b) and fixing the corner primary barrier (2b) of material, and a corner secondary barrier (3b) provided on the outside of the corner primary insulating wall (3b) 41b) and a corner secondary heat insulating wall 5b disposed on the outside of the corner secondary barrier 41b. Here, the corner primary insulating wall (3b) may further include an inner bent portion (3b3).

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

Corner primary barrier (2b), although not shown in Figure 2, the corner primary insulating wall (3b) by a barrier fixing member installed in various ways such as bonding or bolting to the upper end of the corner primary insulating wall (3b) on It is fixedly coupled, and may be installed so as to be in direct contact with 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 in the meaning including the barrier fixing member and the like.

This corner primary barrier 2b is to seal the corner primary heat insulating wall 3b and the flat primary barrier 2a shown in FIG. 1 when the corner block and the flat block shown in FIG. 1 are adjacently connected. It is 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 of the inner bending part (3b3) ( 3b31) may be provided to be bent at a predetermined angle, for example, at an angle of 135 degrees.

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b.

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

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

In addition, the corner primary heat insulating wall 3b may include an inner bent portion 3b3 configured by filling a heat insulating material 3b31 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2.

This corner primary insulating wall (3b), the thickness of the inner primary plywood (31b), the thickness of the corner primary insulating material (32b), the thickness of the outer primary plywood (33b) is the sum of the thickness of the above-mentioned flat primary block The thickness of the thermal wall 3a (eg, a thickness of 160 mm to 250 mm) may be the same.

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

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

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

As such, in this embodiment, the inner first and second fixing parts 3b1 and 3b2 for holding the barrier fixing member to which the corner primary barrier 2b is fixed in the corner block are plywood having a thickness of about 92mm as before. By forming in combination with the corner primary insulating material (32b) of the polyurethane foam instead of only consisting of, it is possible to improve the thermal insulation performance compared to that composed only of the existing plywood, reduce the weight, and reduce the cost have.

Corner primary insulating material (32b) may be disposed between the inner primary plywood (31b) and the outer primary plywood (33b), while blocking heat intrusion from the outside, impact from the outside or liquefaction from the inside In order to withstand the impact caused by gas sloshing, it may be formed of high-density polyurethane foam, which is a material having excellent thermal insulation performance and excellent mechanical strength.

The outer primary plywood (33b) may be disposed between the corner primary insulating 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 a thickness of 6.5mm to 15mm.

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

Each of the inner first and second fixing parts 3b1 and 3b2 composed of the corner primary heat insulating wall 3b is, respectively, the outer first and second fixing parts composed of the corner secondary barrier 41b and the corner secondary insulating wall 5b. Each of the inner first and second fixing parts 3b1 and 3b2 may have a width smaller than the width of each of the outer first and second fixing parts 5b1 and 5b2. Due to this, when a plurality of corner blocks are disposed adjacent to each other 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 disposed adjacent to each other. The inner bent portion 3b3 may be formed in the space portion of the , that is, the space portion where the corner secondary barrier 41b is exposed.

The inner bent portion 3b3 may be configured by filling the heat insulating material 3b31.

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

The insulating material 3b31 of the inner bent portion 3b3 forms a space between the first and second outer fixing portions 5b1 and 5b2 adjacent to each other when a plurality of corner blocks are arranged adjacent to each other as a corner connecting barrier. While sealing together with (42b), it can serve to block the intrusion of heat from the outside.

The corner secondary barrier (41b) may be provided on the outside of the corner primary thermal insulation wall (3b). The corner secondary barrier (41b) may be installed between the corner primary insulating wall (3b) and the corner secondary insulating wall (5b), and together with the corner primary barrier (2b), to prevent leakage of liquefied gas to the outside can

The corner secondary barrier 41b is a part of a corner block together with the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b. , 5b2) adjacent corner secondary barriers 41b may be connected by corner connecting barriers 42b.

The corner connecting barrier 42b can connect the neighboring corner secondary barriers 41 exposed to the outside when the corner blocks are arranged adjacently, and the insulating material 3b31 of the inner bending part 3b3 is installed on the upper part. , It can serve to block the intrusion of heat from the outside by sealing the space portion generated between the insulating 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 to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. 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 stacked may be provided to be bent.

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

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

Here, the outer first fixing part (5b1) may be fixed to the inner side of the first surface, and the outer second fixing part (5b2) may be fixed to the inner side 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 for equally dividing the corner part. have. In the present embodiment, it is described that the corner portions are equally divided, but it is not limited thereto and may not be uniform depending on the corner positions.

This corner secondary thermal insulation wall (5b), the thickness of the inner secondary plywood (51b), the thickness of the corner secondary thermal insulation material (52b), the total thickness of the outer secondary plywood (53b) combined with the above-mentioned flat 2 It may be the same as the thickness of the thermal barrier wall 5a (eg, 150 mm to 240 mm thick).

The inner secondary plywood 51b may be disposed between the corner secondary barrier 2b and the corner secondary insulating material 51b, and the corner secondary barrier 2b may be fixed. The inner secondary plywood (51b) may be formed to a thickness of 6.5mm to 15mm.

The corner secondary insulating material 52b is to be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. can

Corner secondary insulating material (52b), may be formed of polyurethane foam between the inner secondary plywood (51b) and the outer secondary plywood (53b), occupying most of the thickness of the corner secondary insulating wall (5b) .

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

In the liquefied gas storage tank 1 according to the present embodiment, as the thickness of the primary insulating wall 3 is relatively thick compared to the existing one, the secondary barrier 4 in the corner block as well as the flat block is formed in the hull ( 7) is moved to the side and the radius of curvature is increased. In this case, as the radius of curvature of the secondary barrier 4 increases at the corner part, the secondary barrier 4 is non-adhesive to the secondary heat insulating wall 5. length will also increase. This means an increase in the flexibility of the secondary barrier 4 in the obtuse-angled corner structure, whereby the secondary barrier 4 in the obtuse-angled corner structure absorbs peripheral deformations, for example, hull deformation is facilitated, and low-temperature stress is also reduced. will do In the case of this embodiment, the length of the non-adhesive portion may be, for example, 0mm to 100mm, preferably 50mm to 100mm.

As described above, the secondary barrier 4 in the obtuse-angled corner structure of the present invention has a low temperature applied to the existing secondary barrier 4 compared to the obtuse-angled corner structure of the primary insulating wall 3 formed with a relatively thin thickness. stress can be reduced. In addition, since the non-adhesive portion increases, it is also easy to absorb the hull deformation.

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

As for the conditions for performing structural analysis, heat transfer analysis was performed at 20°C at the hull position and 163°C 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 by the structural analysis of the liquefied gas storage tank 1 according to this embodiment, the thickness of the first insulation wall in the flat block and the corner block is about less than the thickness of the second insulation wall It has a thickness as thin as 1/3, and the fixing member corresponding to the inner first and second fixing parts 3b1 and 3b2 is composed of only plywood, and the length of the non-adhesive part is 50mm, and this existing liquefied gas storage In the tank, the stress value in the YY direction of the bent portion 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 the structural analysis is the stress value at the corner, and the lower the stress, the lower the stress, and the temperature is the temperature at the corner.

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

3 is a YY direction of the secondary barriers (4, 41b, 42b) in the portion where the outer first and second fixing parts (5b1, 5b2) are bent to face each other when the length of the non-adhesive part in this embodiment is 50 mm As a result of structural analysis of the stress value and temperature distribution, the YY direction stress value was 37.155 MPa, and the temperature was -57.940 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

4 is a YY direction of the secondary barriers (4, 41b, 42b) in the portion where the outer first and second fixing parts (5b1, 5b2) are bent to face each other when the length of the non-adhesive part in this embodiment is 97 mm As a result of structural analysis of the stress value and temperature distribution, the YY direction stress value was 12.084 MPa and the temperature was -59.025 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

Through this, the present embodiment does not constitute the inner first and second fixing parts 3b1 and 3b2 only with plywood for holding the barrier fixing member to which the corner primary barrier 2b is fixed in the corner block, but rather of polyurethane foam. By forming in a configuration combined with the insulating material (3b31), it is possible to improve the thermal insulation performance compared to that composed only of the conventional plywood, it is possible to reduce the weight, it is possible to reduce the cost.

In addition, in this embodiment, the corner primary insulating wall (3b) of the corner block connected to the flat primary insulating wall (3a) of the flat block and the corner block connected to the flat secondary insulating wall (5a) of the flat block Second blocking By configuring the thickness of the thermal wall 5b to be the same or similar, the thickness of the corner primary thermal insulation wall 3b becomes relatively thick compared to the existing one (however, the thickness of the corner secondary thermal insulation wall 5b maintains the mechanical strength at a certain level) thickness), the low temperature burden and the 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, It is possible to prevent damage to 42b) as well as to prevent brittle fracture of the hull 7 by reducing the low-temperature burden of the secondary barriers 4, 41b, and 42b.

In addition, in this embodiment, the thickness of the corner primary insulating wall (3b) is configured to be relatively thick compared to the existing one, so that the secondary barriers (4, 41b, 42b) are non-adhesive to the corner secondary insulating wall (5b) The length of the portion can be increased, as well as to further lower the probability of damage to the secondary barriers 4, 41b, and 42b due to the increase in flexibility of the secondary barriers 4, 41b, 42b, as well as the secondary barriers 4 , 41b, 42b) facilitates hull deformation absorption, and low-temperature stress can be further reduced.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 5 As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first or second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the metal flat primary barrier 2a, and the flat primary insulating wall 3a provided outside the flat It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

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

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

The corner primary barrier 2b of this embodiment is basically the same as or similar to the first embodiment described above, and detailed description thereof will be omitted here. However, the corner primary barrier 2b of this embodiment may have a different bending angle as the configuration of the corner primary thermal insulation wall 3b is different from the first embodiment. Hereinafter, the corner primary thermal insulation wall 3b is It will be mentioned when explaining.

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b. In the configuration of the corner primary heat insulating wall 3b of this embodiment, the outer primary plywood 33b is omitted, and the inner bent portion 3b3 is formed by filling the insulating material 3b31 as compared with the first embodiment described above. The same or similar bar except that the configuration of the portion to be arranged is different, here, the different configuration will be mainly described.

Corner primary insulating wall (3b) is provided on the inside of the first side and the second side, respectively, the inner primary plywood (31b), corner primary insulating material (32b) to the outside of the corner primary barrier (2b) It may include an inner first fixing part 3b1 and an inner second fixing part 3b2 configured in a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulating material 32b of this embodiment may be the same as or similar to the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions. .

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

In addition, the corner primary heat insulating 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 part (3b12) is a corner intermediate insulating material (32b12) fixed to the corner connecting barrier (42b) connecting the neighboring corner secondary barriers (41b), and the corner intermediate insulating material (32b12) It is disposed on the inside of the corner It may include an inner middle plywood (31b12) to which the primary barrier (2b) is fixed.

The inner middle 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. .

The inner intermediate plywood 31b12 may be parallel to the direction perpendicular to the equally dividing direction ED when the corner portion is equally divided. However, of course, the inner middle plywood (31b12) may not be parallel to the direction perpendicular to the direction (ED) for dividing the corner portion when unevenly dividing the corner portion.

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

This corner intermediate insulating material (32b12), when a plurality of corner blocks are arranged adjacent to each other, the space portion generated between the first and second outer fixing parts (5b1, 5b2) that are adjacently arranged adjacent to each other together with the corner connecting barrier (42b) While sealing, it can serve to block the intrusion of heat from the outside. In this embodiment, the corner connection barrier 42b is formed to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. can

The inner intermediate plywood (31b12) is provided between the inner first fixing portion (3b1) and the inner second fixing portion (3b2), so that the corner primary barrier (2b) is, the inner 1 of the inner first fixing portion (3b1) It is fixed to the inner primary plywood (31b) of the primary plywood (31b), the inner intermediate plywood (31b12) and the inner second fixing part (3b2) of the inner intermediate fixing part (3b12), the inner first fixing part ( 3b1) and the inner intermediate fixing portion 3b12 and between the inner intermediate fixing portion 3b12 and the inner second fixing portion 3b2 may be provided to be bent in an angular range of 150 degrees to 160 degrees.

Through this, in this embodiment, the inner first fixing part 3b1 and the inner second fixing part 3b2 respectively provided on the inside of the first surface and the second surface at different angles are spaced apart by a predetermined interval, and the inner second surface is spaced apart. By providing the inner intermediate fixing portion 3b12 between the first and second fixing portions 3b1 and 3b2, the bending angle of the corner primary barrier 2b by the inner intermediate fixing portion 3b12 can be alleviated, and the corner It is possible to reduce the sloshing burden on the primary barrier 2b, as well as increase the mechanical strength of the corner portion.

The corner secondary barrier 41b may be installed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are arranged adjacently, the outer first and second fixing parts 5b1 and 5b2 ) adjacent corner secondary barriers (41b) may be connected by corner connection barriers (42b), and it is possible to prevent leakage of liquefied gas to the outside together with the corner primary barriers (2b). The corner secondary barrier 41b of this embodiment is the same as or similar to the first embodiment described above, and detailed description is omitted to avoid overlapping description.

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

The corner secondary heat insulating wall 5b of this embodiment is the same as or similar to the first embodiment described above, and detailed description is omitted in order to avoid overlapping description.

6 is a result of structural analysis of the stress values and temperature distributions in the YY direction of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other, and in the YY direction. The stress value was 10.982 MPa, and the temperature was -67.914 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 7 As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first surface or the second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the flat primary barrier 2a made of a metal material, and the flat primary insulating wall 3a being provided on the outside of the flat primary insulating wall 3a. It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

In this embodiment, unlike the drawings, the position of the corner primary insulating wall 3b may be positioned to expose the corner secondary barrier 41b constructed on the corner secondary insulating wall 5b at the center of the corner. . Therefore, the exposed corner secondary barriers 41b are interconnected with the corner connecting barriers 42b to finish, or the corner primary insulating walls 3b are adjacent to each other to connect the corner secondary barriers 41b. Of course, it is also possible to laminate on the corner secondary barrier (41b) / corner connecting barrier (42b) after the construction of the connecting barrier (42b). In this embodiment, the corner connection barrier 42b is formed to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. can

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

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

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

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b. The configuration of the corner primary insulating wall 3b of this embodiment is the same or similar except that the outer primary plywood 33b is omitted as compared with the first embodiment described above, and here, the different configuration will be mainly described.

Corner primary insulating wall (3b) is provided on the inside of the first side and the second side, respectively, the inner primary plywood (31b), corner primary insulating material (32b) to the outside of the corner primary barrier (2b) It may include an inner first fixing part 3b1 and an inner second fixing part 3b2 configured in a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulating material 32b of this embodiment may be the same as or similar to the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions. .

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

In addition, the corner primary heat insulating wall 3b may include an inner bent portion 3b3 formed by filling the heat insulating material 3b32 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The heat insulating material 3b32 of the inner bent portion 3b3 of the present embodiment may be the same as or similar to that of the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions.

The corner secondary barrier 41b may be installed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are arranged adjacently, the outer first and second fixing parts 5b1 and 5b2 ) adjacent corner secondary barriers (41b) may be connected by corner connection barriers (42b), and it is possible to prevent leakage of liquefied gas to the outside together with the corner primary barriers (2b). The corner secondary barrier 41b of this embodiment may have the same or similar basic configuration to the first embodiment described above. However, in the corner secondary barrier 41b encompassing the corner connection barrier 42b of this embodiment, as some configurations of the corner secondary heat insulating wall 5b are different from the first embodiment described above, the arrangement relationship may vary. Hereinafter, it will be referred to when explaining the corner secondary heat insulating wall (5b).

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

The outer first fixing part 5b1 and the outer second fixing part 5b2 may be provided so that side surfaces facing each other are inclined in the direction ED for equally dividing the corner portions. In the present embodiment, it is described that the corner portions are equally divided, but it is not limited thereto and may not be uniform depending on the corner positions.

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 heat insulating wall 5b includes an outer bent portion 5b3 including a heat insulating material 5b31 filled between the chamfered portions of the outer first fixing portion 5b1 and the outer second fixing portion 5b2. can do. The heat insulating material 5b31 of the outer bent portion 5b3 may be a low-density polyurethane foam.

By providing the insulating material 5b31 of the outer bent portion 5b3 in the chamfer portion of the outer first fixing portion 5b1 and the outer second fixing portion 5b2, the corner secondary barrier covering the corner connecting barrier 42b ( 41b) is, the inner secondary plywood (51b) of the outer first fixing part (5b1), the heat insulating material (5b31) of the outer bending part (5b3), the inner secondary plywood (51b) of the outer second fixing part (5b2) ), and may be provided to be bent at a predetermined angle, for example, at an angle of 135 degrees from the inside of the heat insulating 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 respectively fixed to the first and second surfaces at different angles face each other, and the chamfer is formed. By providing the insulating material (5b31) of the outer bent portion (5b3) made of low-density polyurethane foam to the low-density polyurethane foam, it is possible to further increase the thermal insulation performance at the corner portion by the low-density polyurethane foam.

8 is a structural analysis result of the stress value and temperature distribution in the YY direction of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other and are bent in the YY direction. The stress value was 12.003 MPa, and the temperature was -64.358 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 described above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first surface or the second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the flat primary barrier 2a made of a metal material, and the flat primary insulating wall 3a being provided on the outside of the flat primary insulating wall 3a. It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

In this embodiment, unlike the drawings, the position of the corner primary insulating wall 3b may be positioned to expose the corner secondary barrier 41b constructed on the corner secondary insulating wall 5b at the center of the corner. . Therefore, the exposed corner secondary barriers 41b are interconnected with the corner connecting barriers 42b to finish, or the corner primary insulating walls 3b are adjacent to each other to connect the corner secondary barriers 41b. Of course, it is also possible to laminate on the corner secondary barrier (41b) / corner connecting barrier (42b) after the construction of the connecting barrier (42b). In this embodiment, the corner connection barrier 42b is formed to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. can

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

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

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

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b. The configuration of the corner primary heat insulating wall 3b of this embodiment is the same except that the outer primary plywood 33b is omitted and the configuration of the inner bent portion 3b3 is different as compared to the first embodiment described above. Although similar, here, a different configuration will be mainly described.

Corner primary insulating wall (3b) is provided on the inside of the first side and the second side, respectively, the inner primary plywood (31b), corner primary insulating material (32b) to the outside of the corner primary barrier (2b) It may include an inner first fixing part 3b1 and an inner second fixing part 3b2 configured in a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulating material 32b of this embodiment may be the same as or similar to the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions. .

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

In addition, the corner primary insulating wall (3b) is filled between the inner first fixing portion (3b1) and the inner second fixing portion (3b2), the corner secondary barrier (41b) covering the corner connecting barrier (42b) on It may include an outer insulator (3b33) provided in the, and an inner bent portion (3b3) including 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 connection barrier 42b are laminated on the outer surface bent at a certain angle, for example, an angle of 135 degrees. A secondary barrier 4 may be provided.

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

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

The corner secondary barrier 41b may be installed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are arranged adjacently, the outer first and second fixing parts 5b1 and 5b2 ) adjacent corner secondary barriers (41b) may be connected by corner connection barriers (42b), and it is possible to prevent leakage of liquefied gas to the outside together with the corner primary barriers (2b). The corner secondary barrier 41b of this embodiment may have the same or similar basic configuration to the first embodiment described above. However, in the corner secondary barrier 41b encompassing the corner connection barrier 42b of this embodiment, some configurations of the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b are the first embodiment described above. According to the change, the arrangement relationship may vary, which will be referred to when describing the corner secondary insulating wall 5b hereinafter.

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

The outer first fixing part 5b1 and the outer second fixing part 5b2 may be provided so that side surfaces facing each other are inclined in the direction ED for equally dividing the corner portions. In the present embodiment, it is described that the corner portions are equally divided, but it is not limited thereto and may not be uniform depending on the corner positions.

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

In addition, the corner secondary heat insulating wall 5b may include an outer bent portion 5b3 including a heat insulating material 5b312 filled between the step portions of the outer first fixing portion 5b1 and the outer second fixing portion 5b2. The heat insulating material 5b32 of the outer bent portion 5b3 may be glass wool, which is the same material as the outer heat insulating material 3b33 of the inner bent portion 3b3.

A corner secondary barrier ( 41b) is, the inner secondary plywood (51b) of the outer first fixing part (5b1), the insulating material (5b32) of the outer bending part (5b3), the inner secondary plywood (51b) of the outer second fixing part (5b2) ), and may be provided to be bent at a predetermined angle, for example, an angle of 135 degrees from the inside of the heat insulating material 5b32 of the outer bent portion 5b3.

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

10 is a structural analysis result of the YY direction stress value and temperature distribution of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other, and the YY direction The stress value was 12.003 MPa, and the temperature was -64.358 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first surface or the second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the flat primary barrier 2a made of a metal material, and the flat primary insulating wall 3a being provided on the outside of the flat primary insulating wall 3a. It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

In this embodiment, unlike the drawings, the position of the corner primary insulating wall 3b may be positioned to expose the corner secondary barrier 41b constructed on the corner secondary insulating wall 5b at the center of the corner. . Therefore, the exposed corner secondary barriers 41b are interconnected with the corner connecting barriers 42b to finish, or the corner primary insulating walls 3b are adjacent to each other to connect the corner secondary barriers 41b. Of course, it is also possible to laminate on the corner secondary barrier (41b) / corner connecting barrier (42b) after the construction of the connecting barrier (42b). In this embodiment, the corner connection barrier 42b is formed to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. can

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

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

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

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b. The configuration of the corner primary insulating wall 3b of this embodiment is the same or similar except that the outer primary plywood 33b is omitted as compared with the first embodiment described above, and here, the different configuration will be mainly described.

Corner primary insulating wall (3b) is provided on the inside of the first side and the second side, respectively, the inner primary plywood (31b), corner primary insulating material (32b) to the outside of the corner primary barrier (2b) It may include an inner first fixing part 3b1 and an inner second fixing part 3b2 configured in a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulating material 32b of this embodiment may be the same as or similar to the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions. .

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

In addition, the corner primary heat insulating wall 3b may include an inner bent portion 3b3 configured by filling a heat insulating material 3b35 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The heat insulating material 3b35 of the inner bent portion 3b3 of the present embodiment may be the same as or similar to that of the first embodiment described above, and accordingly, detailed description thereof will be omitted to avoid overlapping description.

The corner secondary barrier 41b may be installed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are arranged adjacently, the outer first and second fixing parts 5b1 and 5b2 ) adjacent corner secondary barriers (41b) may be connected by corner connection barriers (42b), and it is possible to prevent leakage of liquefied gas to the outside together with the corner primary barriers (2b). The corner secondary barrier 41b of this embodiment may have the same or similar basic configuration to the first embodiment described above. However, in the corner secondary barrier 41b encompassing the corner connection barrier 42b of this embodiment, as some configurations of the corner secondary heat insulating wall 5b are different from the first embodiment described above, the arrangement relationship may vary. Hereinafter, it will be referred to when explaining the corner secondary heat insulating wall (5b).

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

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

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

The outer intermediate fixing portion (5b12), the outer intermediate plywood (51b12) fixed to the first and second surfaces, respectively, and the outer intermediate insulating material (52b12) provided on the inside of the outer intermediate plywood (51b12), the outer It is provided on the inside of 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 middle plywood (51b12) is located on the same line as the inner secondary plywood (51b), and may have the same configuration.

The outer intermediate insulating material 52b12 may be a polyurethane foam.

The inner middle insulating material 53b12 may be glass wool.

An outer intermediate fixing portion (5b12) in which the outer intermediate plywood (51b12), the outer intermediate insulation material (52b12), the inner intermediate insulation material (53b12) are stacked between the first outer fixing portion (5b1) and the outer second fixing portion (5b2) By being provided, the corner secondary barrier (41b) encompassing the corner connection barrier (42b) is, the inner secondary plywood (51b) of the outer first fixing part (5b1), the inner middle of the outer intermediate fixing part (5b12) Insulation material (53b12), is fixed to the inner secondary plywood (51b) of the outer second fixing part (5b2), a certain angle from the inside of the inner middle insulating material (53b12) of the outer intermediate fixing part (5b12), for example, 135 It may be provided 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 fixed to the first and second surfaces of different angles, respectively. However, the flexibility of the corner secondary barrier (41b) covering the corner connecting barrier (42b) formed on the inner intermediate insulating material (53b12) of the outer intermediate fixing part (5b12) made of glass wool is improved, so that the corner connecting barrier (42b) It is possible to further prevent damage to the corner secondary barrier (41b) encompassing the.

In addition, in this embodiment, a predetermined interval is spaced between the outer first fixing portion 5b1 and the outer second fixing portion 5b2 fixed to the first surface and the second surface at different angles, respectively, and the outer first, By providing the outer intermediate fixing portion 5b12 between the second fixing portions 5b1 and 5b2, between the outer first fixing portion 5b1 and the outer intermediate fixing portion 5b12 and between the outer second fixing portion 5b2 and the outer middle Contraction or expansion stress due to temperature in the outer fixing parts 5b1, 5b2, 5b12 having two gaps of the present embodiment compared to the existing one-gap outer fixing part by the gap formed between the fixing parts 5b12, respectively. It is possible to prevent damage to the secondary corner barrier 41b encompassing the corner connecting barrier 42b fixed to the outer fixing portions 5b1, 5b2, 5b12 by (stress) relief.

12 is a structural analysis result of the stress value and temperature distribution in the YY direction of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other and are bent in the YY direction. The stress value was 13.101 MPa, and the temperature was -74.480°C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 13 As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first surface or the second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the flat primary barrier 2a made of a metal material, and the flat primary insulating wall 3a being provided on the outside of the flat primary insulating wall 3a. It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

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

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

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

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

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b. In the configuration of the corner primary heat insulating wall 3b of this embodiment, the outer primary plywood 33b is omitted, and the outer surface shape of the insulating material 3b31 of the inner bent portion 3b3 is similar to that of the first embodiment described above. The same or similar bar except for the difference, here, the description will be mainly focused on the different configuration.

Corner primary insulating wall (3b) is provided on the inside of the first side and the second side, respectively, the inner primary plywood (31b), corner primary insulating material (32b) to the outside of the corner primary barrier (2b) It may include an inner first fixing part 3b1 and an inner second fixing part 3b2 configured in a sequentially stacked structure. Here, the inner primary plywood 31b and the corner primary insulating material 32b of this embodiment may be the same as or similar to the first embodiment described above, and thus detailed descriptions are omitted to avoid overlapping descriptions. .

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

In addition, the corner primary heat insulating wall 3b may include an inner bent portion 3b3 formed by filling a heat insulating material 3b36 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The heat insulating material 3b36 of the inner bent portion 3b3 of this embodiment may be the same as or similar to that of the first embodiment. However, the shape of the outer surface of the insulator 3b36 of the inner bent portion 3b3 of the present embodiment may be changed as the configuration of the outer first and second fixing portions 5b1 and 5b2 is changed.

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

The corner secondary barrier 41b may be installed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are arranged adjacently, the outer first and second fixing parts 5b1 and 5b2 ) adjacent corner secondary barriers (41b) may be connected by corner connection barriers (42b), and it is possible to prevent leakage of liquefied gas to the outside together with the corner primary barriers (2b). In this embodiment, the corner connection barrier 42b is formed to extend to a length overlapping with at least the inner first and second fixing parts 3b1 and 3b2 as well as between the inner first and second fixing parts 3b1 and 3b2. can

The corner secondary barrier 41b of this embodiment may have the same or similar basic configuration to the first embodiment described above. However, in the corner secondary barrier 41b encompassing the corner connection barrier 42b of this embodiment, as some configurations of the corner secondary heat insulating wall 5b are different from the first embodiment described above, the arrangement relationship may vary. Hereinafter, it will be referred to when explaining the corner secondary heat insulating wall (5b).

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

The outer first fixing part 5b1 and the outer second fixing part 5b2 may be provided so that side surfaces facing each other are inclined in the direction ED for equally dividing the corner portions. In the present embodiment, it is described that the corner portions are equally divided, but it is not limited thereto and may not be uniform depending on the corner positions.

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 the peripheral plywood (51b1) fixed on the corner secondary insulating material (52b), the peripheral plywood (51b1) ) and may be composed of an inclined plywood (51b2) fixed on the corner secondary insulating material (52b) of the chamfer portion. Accordingly, unlike the first embodiment described above, the corner primary insulating material 32b is provided on the peripheral plywood 51b1, and the insulating material 3b36 of the inner bent portion 3b3 is provided on the inclined plywood 51b2. can

The insulator 3b36 of the inclined plywood 51b2 and the inner bent portion 3b3 is provided in the chamfered portion of the outer first fixing portion 5b1 and the outer second fixing portion 5b2, thereby forming the corner connecting barrier 42b. Containing corner secondary barrier (41b), the outer first fixing portion (5b1) of the peripheral plywood (51b1), the outer first fixing portion (5b1) of the inclined plywood (5b2), the outer second fixing portion (5b2) ) of the inclined plywood (5b2), may be fixed to the peripheral plywood (51b1) of the outer second fixing portion (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 portion 5b1 and the outer second fixing portion 5b2. can

That is, the corner secondary barrier 41b encompassing the corner connection barrier 42b is an inclined plywood 51b2 of the peripheral plywood 51b1 and the outer first fixing part 5b1 of the outer first fixing part 5b1. ) is bent outward between, and is bent inward 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 the outer second high It may be provided to be bent outwardly 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 respectively fixed to the first and second surfaces at different angles face each other, and the chamfer is formed. By installing a corner secondary barrier (41b) encompassing the corner connecting barrier (42b) along the surface of the outer first and second fixing parts (5b1, 5b2) including the part, the corner encompassing the corner connecting barrier (42b) The secondary barrier 41b protrudes and bends to the outside to increase the length of the non-adhesive part to the corner secondary insulating wall 5b, and the corner secondary barrier 41b encompassing the corner connection barrier 42b Flexibility (flexibility) Due to the increase, not only can the damage probability of the corner secondary barrier 41b encompassing the corner connecting barrier 42b be lowered further, but also the corner secondary barrier 41b encompassing the corner connecting barrier 42b absorbs hull deformation. is facilitated, and the low temperature stress can be further reduced.

14 is a result of structural analysis of the stress values and temperature distributions in the YY direction of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other and bend in the YY direction. The stress value was 7.197 MPa, and the temperature was -53.710°C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

As shown in FIG. 15, the liquefied gas storage tank 1 of this embodiment is the same as compared to the liquefied gas storage tank 1 of the first embodiment, except for the configuration of the inner bending part 3b3. Alternatively, they may be similar, and accordingly, detailed descriptions of the same components will be omitted to avoid overlapping descriptions, and different configurations will be mainly described.

The configuration of the corner primary heat insulating wall 3b of this embodiment is the same as that of the first embodiment, except that the configuration of the portion in which the inner bent portion 3b3 composed of filling the heat insulating material 3b31 is different is different, compared with the first embodiment described above. Although similar, here, a different configuration will be mainly described.

The corner primary heat insulating wall 3b of this embodiment may include a vacuum insulation panel 3b37 filled in the inner bent part 3b3 between the inner first fixing part 3b1 and the inner second fixing part 3b2. have.

In the case of this embodiment, since the inner first fixing part 3b1 and the inner second fixing part 3b2 are non-structural members, the structural member between the inner first fixing part 3b1 and the inner second fixing part 3b2 is 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 thus can improve insulation performance in a corner portion.

16 is a structural analysis result of the stress value and temperature distribution in the YY direction of the secondary barriers 4, 41b, 42b in the portion where the outer first and second fixing parts 5b1 and 5b2 face each other and are bent in the YY direction. The stress value was 12.003 MPa, and the temperature was -64.358 °C. These figures are compared with the YY direction stress value of the bent part of the secondary barrier of the existing liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857 ° C., the secondary barriers 4 and 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 in the secondary barriers 4, 41b, 42b of this embodiment is reduced compared to the existing ones.

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

The planar structure of the liquefied gas storage tank 1 of this embodiment may be made of a combination of a plurality of flat blocks, as shown in FIG. 1 above, and the corner structure of the liquefied gas storage tank 1 is shown in FIG. 17 As shown in, it may be made of a combination of a plurality of corner blocks. Such a plurality of flat blocks may be connected to a plurality of corner blocks at a corner portion 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 as 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 this embodiment is, as shown in FIG. 1, a flat portion on the first surface or the second surface at different angles forming a storage space for accommodating the liquefied gas. The flat primary insulating wall 3a arranged on the outside of the flat primary barrier 2a and fixing the flat primary barrier 2a made of a metal material, and the flat primary insulating wall 3a being provided on the outside of the flat primary insulating wall 3a. It may include a secondary barrier (41a) and a flat secondary heat insulating wall (5a) disposed on the outside of the flat secondary barrier (41a).

Accordingly, a detailed description of the flat block configuration of the liquefied gas storage tank 1 is omitted here to avoid overlapping 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), the primary barrier (2) in contact with the liquefied gas, the primary insulating wall (3) installed on the outside of the primary barrier (2), It may be configured to include a secondary barrier (4) installed on the outside of the primary insulating wall (3), a secondary insulating wall (5) disposed on the outside of the secondary barrier (4). The liquefied gas storage tank (1) may be supported on the hull (7) by the mastic (6) installed between the secondary insulating 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 is a flat primary insulating wall of a flat block. (3a) and the corner primary insulating wall 3b of the corner block, and the secondary barrier 4 may be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block. In addition, the secondary insulating wall 5 may be composed of a flat secondary insulating wall 5a of a flat block and a corner secondary insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the first insulating wall 3 and the thickness of the secondary insulating wall 5 in the flat block and the corner block may be the same or similar.

In the above, the secondary barrier 4 of the flat block and the corner block, when arranging a plurality of flat blocks or a plurality of corner blocks adjacent to each other, the flat secondary barriers 41a disposed adjacent to each other or adjacently disposed adjacent to each other It may include a flat connecting barrier (42a) or a corner connecting barrier (42b) for connecting the corner secondary barrier (41b).

17, the corner portion of the liquefied gas storage tank 1 according to the eighth embodiment of the present invention may be made of a combination of a plurality of corner blocks.

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

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

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

The barrier fixing member 21b is a metal material and may be installed on the upper portion of the corner primary heat insulating wall 3b. In the case of the corner primary thermal insulation wall 3b, a plurality of corners may be arranged along the side of the corner portion on the corner secondary thermal insulation wall 5b, and accordingly, the barrier fixing member 21b is provided in each of the plurality of corner primary thermal insulation walls 3b. Can be installed independently.

The corner primary insulating wall (3b) is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the corner primary barrier (2b) and the corner secondary It may be installed between the barriers 41b.

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

The corner primary insulating wall 3b in which the inner primary plywood 31b and the corner primary insulating material 32b are sequentially stacked may be arranged in plurality along the side of the corner part on the corner secondary insulating wall 5b. .

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

The plurality of corner primary insulating walls 3b are disposed adjacent to each other on the corner secondary insulating walls 5b, so that filling of a separate insulating material such as glass wool between the plurality of corner primary insulating walls 3b is omitted. , it can be arranged to minimize the gap between the plurality of corner primary insulating walls (3b).

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

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

The plurality of corner primary thermal insulation walls 3b are a part of a corner block together with the corner secondary barriers 41b and the corner secondary thermal insulation walls 5b. The width may be smaller than the width of the corner secondary heat insulating wall 5b, which is another configuration of the corner block. Due to this, a portion of the corner secondary barrier 41b may be exposed to the outermost side of the plurality of corner primary heat insulating walls 3b. When a plurality of corner blocks are arranged adjacently along the side of the corner portion, the space portion between the outermost corner primary insulating walls 3b disposed adjacently, that is, the space portion where the corner secondary barriers 41b are exposed. A corner connection insulating wall 34b may be installed.

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

Such a corner connection insulating wall 34b, when arranging a plurality of corner blocks adjacent to each other along the side of the corner portion, forms a space between the corner secondary thermal insulation walls 5b disposed adjacent to each other as a corner connection barrier 42b. It is installed to block heat intrusion from the outside while sealing it together.

When arranging a plurality of corner blocks adjacent to each other along the corner portion in this way, the space between the corner connecting insulating material 42b and the corner primary insulating material 32b and between the corner connecting plywood 342b and the inner primary plywood 31b. is generated, and the inner second packing material 3b5 on which the corner primary barrier 2b is seated is filled in this space to finish the construction of the corner primary insulating wall 3b.

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

The corner secondary barrier (41b) may be installed between the corner primary insulating wall (3b) and the corner secondary insulating wall (5b), and together with the corner primary barrier (2b), to prevent leakage of liquefied gas to the outside can

The corner secondary barrier 41b is a part of a corner block together with the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b. When the corner blocks are arranged adjacently, the neighboring corner secondary barrier 41b may be sealingly connected through the corner connection barrier 42b.

The corner connecting barrier 42b may connect the neighboring corner secondary barriers 41 exposed to the outside when the corner blocks are arranged adjacently, and the corner connecting insulating wall 34b may be installed thereon.

Corner secondary insulating wall (5b), the inner secondary plywood (51b), the corner secondary insulating material (52b), may be configured to include an outer secondary plywood (53b). Corner secondary insulating wall (5b) is fixed to the inside of the first side and the second side, respectively, the inner secondary plywood (51b), the corner secondary insulating material (52b) to 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 adjacently along the side of the corner, a space generated between the adjacent corner secondary heat insulating walls 5b may be filled with the outer packing material 5b4.

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

The corner secondary thermal insulation wall 5b of this embodiment may be the same as or similar to the corner secondary thermal insulation wall 5b according to at least any one of the first to seventh embodiments described above, and here Specific descriptions are omitted to avoid duplicate descriptions.

Through this, in this embodiment, the corner primary insulating wall 3b including the inner primary plywood 31b forming a step with the corner primary insulating material 32b is arranged in plurality on the corner secondary insulating wall 5b, By configuring the adjacent corner primary insulating material (32b) to be arranged adjacently, not only to facilitate the installation and handling of the barrier fixing member (21b) through the step portion between the adjacently arranged inner primary plywood (31b), Since the packing material 3b4 only needs to be seated on the step portion, consumption of the packing material can be reduced.

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

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

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

The liquefied gas storage tank 1 of this embodiment is completed by connecting the corner block CB formed in the corner portion and the flat block formed in the flat portion, where the flat block is the figure of the first embodiment described above. It may be a flat block having 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 the present invention is not limited thereto. Of course, it may be the same as or similar to the structure of any one of the eighth to eighth embodiments.

The lower block LB, as shown in FIG. 18, may have an upper block UB and an upper connection block UBB installed on the upper surface, and a corner secondary barrier that is bonded to the lower surface of the upper block UB. When the lower block LB and the lower block LB are disposed adjacent to each other, the upper block UB is not installed and the adjacent corner secondary barrier 41b exposed to the outside is connected and bonded to the lower surface of the upper connection block UBB. The corner connecting barrier 42b to be coupled, the inner secondary plywood (51b), the corner secondary insulating material (52b), the corner secondary insulating wall (5b) comprising the outer secondary plywood (53b) can be made of have.

The sub-block LB of this embodiment may be the same as or similar to the configuration according to at least any one of the first to eighth embodiments described above, and detailed description is provided here to avoid overlapping description. omit

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

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

In the above, the corner primary insulating wall (3b) is provided on the inner side of the first and second surfaces, respectively, and the inner primary plywood (31b), the corner primary insulating material (32b) to the outside of the barrier fixing member (21b) ), the outer primary plywood (33b) may include an inner first fixing portion (3b1) and an inner second fixing portion (3b2) configured in a sequentially stacked structure. The inner first fixing part 3b1 and the inner second 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 insulating wall (3b) is installed in the corner space portion between the inner first fixing part (3b1) and the inner second fixing part (3b2), and may include an inner bent part (3b3) made of a heat insulating material have.

The inner bent part 3b3 of this embodiment, as shown in FIGS. 19, 20, and 21, is different from the conventional integrated inner bent part, the inner first half-bend part 3b3' and the inner second half-bend part It may be divided into parts 3b3".

That is, the inner first half-bend portion 3b3 ′ and the inner second half-bend portion 3b3″ have a triangular shape in which the existing integrated inner bent portion is symmetrically cut along the direction ED for equally dividing the corner portions. can have

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

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

The assembly process of the upper block UB of this embodiment is as follows.

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

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

The inner second fixing portion 3b2 and the inner second half-bending portion 3b3″ are bonded to each other by bonding using the second bonding portion 3b7.

The inner first half-bend portion 3b3 ′ and the inner first fixing portion 3b1 bonded by bonding are bonded to the secondary barrier 4 using the adhesive 10 .

The inner second half-bend portion 3b3″ and the inner second fixing portion 3b2 bonded by bonding are bonded to the secondary barrier 4 using an adhesive 10 .

A corner first inner packing material (3b8) is inserted and installed in the space created between the inner first half-bend part (3b3') and the inner second half-bend part (3b3") by bonding to the secondary barrier 4 Complete the assembly.

As described above, in the corner primary heat insulating wall 3b of this embodiment, the inner first and second half-bent portions 3b3', 3b3" are the inner first and second heights by the first and second bonding portions 3b6 and 3b7. In the state of bonding to the top portions 3b1 and 3b2, it may be assembled and installed in the corner portion. At this time, the outer primary plywood 53b of the inner first and second fixing portions 3b1 and 3b2 is an adhesive (10). can be fixed to the corner connection barrier 42b of the secondary barrier 4 by the It is placed in a non-adhesive state with the connection barrier (42b).

In the assembled and installed state as described above, there is inevitably a space between the inclined surface of the inner first half-bend part 3b3' and the inclined surface of the inner second half-bend part 3b3" facing each other. In order to prevent the thermal convection phenomenon occurring through (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.

In addition, the corner first inner packing material 3b8 is inserted into the space between the inner first and second half-bend portions 3b3' and 3b3" to have a (+) tolerance so as to completely seal the space. can be formed.

In this embodiment, the outer primary plywood 53b of the inner first and second fixing parts 3b1 and 3b2 should be in an adhesive state with the corner connecting barrier 42b of the secondary barrier 4, and the inner first , The bottom surface of the two-half bent portions 3b3 ', 3b3" should be in a non-adhesive state with the corner connection barrier 42b. In order to prevent diffusion into the area, it is necessary to provide a squeeze-out confirmation means capable of confirming the squeeze-out of the adhesive 10 .

In the present embodiment, the chamfer CF may be formed at a right-angled corner portion where the side surfaces and the bottom surfaces of the inner first and second half-bends 3b3 ′ and 3b3″ meet as a squeeze-out checking means.

This chamfer CF is, as shown in FIG. 19, in the state where the corner primary heat insulating wall 3b is installed at the corner, the outer primary plywood ( 53b) By forming a space on the side, it is possible to visually confirm that the adhesive 10 is squeezed out.

The barrier fixing member 21b is a metal material and may be installed on the upper portion of the corner primary heat insulating wall 3b.

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

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

Through this, in this embodiment, the inner first half-bend portion 3b3 ′ and the inner second fixing portion are bonded to the inner bent portion 3b3 of the corner primary insulating wall 3b to the inner first fixing portion 3b1. By configuring the inner second half-bend portion 3b3' bonded to 3b2, even if the inner first and second half-bend portions 3b3', 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 part 3b3' and between the inner second fixing part 3b2 and the inner second half-bend part 3b3", so that in the inner bent part 3b3 Tropical convection can be prevented.

In addition, in this embodiment, by closing the space between the inner first and second half-bend portions 3b3', 3b3" with the corner first inner packing material 3b8 having a (+) tolerance, the inner first and second Even if the half-bends 3b3' and 3b3" expand or contract, it is possible to block the thermal convection path between the inner first and second half-bends 3b3' and 3b3", flow can be prevented.

In addition, in this embodiment, the inner first and second fixing parts 3b1, 3b1, When the outer primary plywood 53b of 3b2) is adhered to the corner connection barrier 42b of the secondary barrier 4 with the adhesive 10, the adhesive 10 in the adhesive area is squeezed out to the non-adhesive area It can be directly confirmed with the naked eye, and bonding defects can be prevented.

The upper connection block UBB of this embodiment may be bonded to the upper surface of the adjacent lower blocks LB to connect the lower blocks LB. The upper connection block (UBB) is an 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 and an upper block (UB) arranged adjacent thereto It can be installed in the space exposed between them.

The upper connection block UBB, as shown in FIGS. 18 and 22 , may be formed of a corner connection insulating wall 34b disposed on the outside of the barrier fixing member 21b.

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

In the above, the corner connection insulating wall (34b) is provided on the inside of the first side and the second side, respectively, the corner first connection plywood (342b), the corner connection insulating material (341b) to 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 corner first connection fixing part 34b1 and the corner second connection fixing part 34b2 may be provided symmetrically with respect to the direction ED in which the corner parts are equally divided.

In addition, the corner connection insulating wall 34b is installed in the corner space portion between the corner first connection fixing part 34b1 and the corner second connection fixing part 34b2, and the corner connection bending part 34b3 made of a heat insulating material is formed. may include

The corner connection bent part 34b3 of this embodiment, as shown in FIG. 22, is different from the conventional integrated inner bent part, the corner first half-bend part 34b3' and the corner second half-bend part 34b3") It can be divided into

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

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

The corner connection insulating wall 34b of this embodiment may further include a corner second inner packing material 34b8 for sealing the space between the corner first and second half-bend portions 34b3' and 34b3".

Each of the corner first half-bend part 34b3', the corner second half-bend part 34b3", and the corner second inner packing material 34b8 of the upper connection block UBB is the above-described upper block UB. The inner first half-bend part 3b3', the inner second half-bend part 3b3", and the corner first inner packing material 3b8 of the In this regard, detailed descriptions are omitted here to avoid overlapping descriptions.

23 is a partial front view of a corner part for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention, and FIG. 24 is a corner part for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention. It is a partially exploded perspective view, FIG. 25 is a front view for explaining the integrated upper block of FIG. 23, FIG. 26 is a front view for explaining another embodiment of the integrated upper block of FIG. 25, and FIG. 27 is the integrated upper block of FIG. is a side view, FIG. 28 is a cross-sectional view taken along line A-A' of FIG. 25, FIG. 29 is a perspective view for explaining the upper connection block of FIG. 23, and FIG. 30 is a diagram for explaining the upper connection block of FIG. is a front view for, FIG. 31 is a cross-sectional view taken along line B-B' of FIG. 30, FIG. 32 is a cross-sectional view for explaining another embodiment of the integrated upper block of FIG. 25, and FIG. It is an exploded view of the upper block, and FIGS. 34 to 37 are convection changes depending on the structure of the corner primary insulating wall and the corner connecting insulating 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. It is a diagram for explaining and comparing the temperature of the path and the secondary barrier.

23 and 24, the corner portion of the liquefied gas storage tank 1 according to the tenth embodiment of the present invention may be made of a combination of a plurality of corner blocks (CB). The primary structure of the corner block CB is fixed to the hull 7 and includes a lower block LB made of a single board, and a lower block LB bonded on the lower block LB. A secondary barrier exposed between an integrated upper block (UUB) made of a single board having a width that is narrower than the front, rear, left, and right widths of a single board and an adjacently arranged lower block (LB) and exposed between the adjacent integrated upper blocks (UUB) ( 4) and may be formed of an upper connection block (UBB) that is bonded to each other.

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

The lower block LB, as shown in FIG. 23, may have an integrated upper block UUB and an upper connection block UBB installed on the upper surface, and a corner 2 that is bonded to the lower surface of the integrated upper block UUB. When the vehicle barrier 41b and the lower block LB are disposed adjacent to each other, the integrated upper block UUB is not installed and connects the adjacent corner secondary barrier 41b exposed to the outside, and A corner connecting barrier 42b bonded to the lower surface, an inner secondary plywood 51b, a corner secondary insulating material 52b, and an outer secondary plywood 53b. Corner secondary insulating wall 5b can be made with

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

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

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

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

The integrated upper block (UUB) is, as shown in FIGS. 23, 24, 25, 26, and 27, a barrier fixing member comprising a plurality of unit barrier fixing members 21b1, 21b2, 21b3, 21b4. One inner primary plywood (31b), one corner primary insulating material (32b), and one outer primary plywood (33b) are sequentially stacked on the outside of (21b). It may be formed of a corner primary heat insulating wall 3b including a first fixing part 3b1 and an inner second fixing part 3b2. The inner first fixing part 3b1 and the inner second 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 configured in the single board structure may be fixed by a plurality of unit barrier fixing members 21b1, 21b2, 21b3, and 21b4, as will be described later.

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

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

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 heat insulating wall 3b, as shown in FIGS. 25, 27 and 28 . It may have a reduced size to the size of , and may form a symmetrical shape based on the direction ED in which the corner portion is equally divided.

Hereinafter, the reduced size of the inner bent portion 3b3 is described as being applied to the 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 thereto. It goes without saying that the unit upper blocks UB1, UB2, UB3, and UB4 may also be applied to the existing upper block UB in which the unit upper blocks UB1, UB2, UB3, and UB4 are arranged adjacent to each other.

Specifically, the reduced size of the inner bent portion (3b3), the height of both sides perpendicular to the corner connecting barrier (42b) of the secondary barrier (4) on the inside of the first surface and the second surface is the inner first, 2 The fixing parts (3b1, 3b2) each have a height reduced to a size within the range of 40% to 60% with respect to about half of the total height, for example, with respect to the total height of the inner first and second fixing parts (3b1, 3b2). can

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

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

As described above, the corner primary heat insulating wall 3b of this embodiment is in a state in which the second side of the inner first fixing part 3b1 and the second side of the inner second fixing part 3b2 are opposite to each other to face each other, The outer primary plywood (53b) 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), the inner first, 2 It can be assembled by inserting the reduced size of the inner bent portion (3b3) into the corner space created by the fixing portions (3b1, 3b2).

In the assembled and installed state as described above, between the first sides of the inner first and second fixing parts 3b1 and 3b2 in close contact with both sides of the reduced size of the inner bent portion 3b3, and the inner second facing each other A space inevitably exists between the second side surfaces of the first and second fixing parts 3b1 and 3b2, and in order to prevent a thermal convection phenomenon occurring through such a space, the corner primary heat insulating wall 3b of this embodiment has an inner It may further include a corner inner packing material (3b8) for sealing the space between the second side of the first and second fixing parts (3b1, 3b2).

The corner inner packing material 3b8 may be formed of a vacuum insulating material using glass wool as a main raw material.

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

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

The corner inner packing material (3b8) is inserted to a predetermined depth into the inner bent portion (3b3), the inner bent portion (3b3) of this embodiment has a predetermined depth in the same direction as the dividing direction (ED) at the point where both sides meet of the 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 the depth may be less than half of the thickness of the inner bent portion 3b3, but is not limited thereto.

Through this, in the present embodiment, as the size of the inner bent portion 3b3 is reduced, the space in which thermal convection occurs (non-adhesive region between the inner bent portion and the secondary barrier in the corner portion) can be reduced as well as thermal convection. Corner inner packing between the first and second sides of the inner first and second fixing parts 3b1 and 3b2 that can be called a path and the second side of the inner first and second fixing parts 3b1 and 3b2 in a bent state By forming the ashes 3b8, the reduced area according to temperature change is reduced compared to the existing inner bent portions formed at the same height as the inner first and second fixing portions 3b1 and 3b2, thereby reducing the thermal convection phenomenon.

In addition, in the present embodiment, by allowing the corner inner packing material 3b8 to be inserted to a predetermined depth into the inner bent portion 3b3, the thermal convection phenomenon in the inner bent portion 3b3 can be further reduced.

As shown in FIGS. 24 and 27 , the inner bent portion 3b3 of which the size is reduced according to the present exemplary embodiment may be provided with first protrusions PT1 on both sides thereof.

The first protrusion PT1 may extend outside the space by a predetermined length from the inner bent portion 3b3 inserted into the corner space generated by the inner first and second fixing portions 3b1 and 3b2.

The first protrusion PT1 has a cross-sectional shape similar to that of 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 may extend in the same line from, and both sides perpendicular to the corner connecting 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 have a first step ST1 with respect to the inner bent portion 3b3 by making it smaller than the size of the inner bent portion 3b3, so that the first step ST1 is As a result, the thermal convection path forms a curved path, thereby preventing the tropical convection phenomenon, which will be described later.

The integrated upper block (UUB) of this embodiment, as shown in Figs. 23, 24, 25, to be prepared for the contraction and expansion stress of the corner primary heat insulating wall 3b having a single board structure, a certain upper portion It may include a plurality of upper slits SL1 formed to a depth.

The upper slit SL1 is half of the thickness of the corner primary insulating wall 3b constituting the integrated upper block UUB so that the contraction or expansion stress caused by the temperature applied to the corner primary insulating wall 3b can be relieved as much as possible. It may have a depth of less than or equal to, for example, a depth within the range of 30% to 50%.

The upper slit SL1 penetrates through the inner primary plywood 31b, which is the upper layer of the corner primary insulating wall 3b, to form at least a part of the corner primary insulating material 32b, which is the middle layer, so that the corner primary insulating material ( It is desirable to prepare for the shrinkage or expansion stress of 32b).

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

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

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

The lower slit SL2 is half of the thickness of the corner primary insulating wall 3b constituting the integrated upper block UUB so that the contraction or expansion stress caused by the temperature applied to the corner primary insulating wall 3b can be relieved as much as possible. It may have a depth of less than or equal to, for example, a depth within the range of 30% to 50%.

The lower slit SL2 penetrates through the outer primary plywood 53b, which is the lower layer of the corner primary insulating wall 3b, to form at least a part of the corner primary insulating material 32b, which is the middle layer, so that the corner primary insulating material ( It is desirable to prepare for the shrinkage or expansion stress of 32b).

The lower slit SL2 of the present embodiment may be formed at a position crossing the upper slit SL1, and it is of course not limited to this position and may be formed at an arbitrary position spaced apart by a predetermined distance.

Through this, in this embodiment, an upper slit SL1 of a predetermined depth is formed on the upper portion of the integrated upper block UUB, and a lower slit of a predetermined depth is formed in the lower portion of the integrated upper block UUB to cross the upper slit SL1. By forming the SL2, it is possible to relieve the contraction and expansion stress of the integrated upper block UUB by the upper and lower slits SL1 and SL2.

In addition, the integrated upper block (UUB) of this embodiment is bonded to the upper portion of the corner secondary barrier 4 by bonding with an adhesive 10, compared to the existing upper block, the adhesion area is wide compared to the conventional upper block, so the adhesive 10 in the bonding area. In order to prevent the adhesive 10 from spreading to the non-adhesive area while securing sufficient adhesive force by the adhesive, it is necessary to provide a squeeze-out confirmation means capable of confirming the squeeze-out of the adhesive 10 .

In this embodiment, as shown in FIGS. 24, 25, and 26, when bonding the outer primary plywood 53b with the adhesive 10 on the secondary barrier 4, the non-adhesive area A plurality of first grooves in the outer primary plywood 53b of the integrated upper block (UUB) as a means to confirm that the adhesive 10 is squeezed out and prevent the adhesive 10 from excessively penetrating into the non-adhesive area (GV1) can be formed.

In the above, the non-adhesive region may be set in plurality in the middle portion, including both edge portions of the outer primary plywood (53b).

Each of the plurality of non-adhesive regions may be set at a predetermined interval and width in a vertical direction to a corner side of the storage tank. For example, the plurality of non-adhesive areas are 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) constituting the existing upper block (UB). The plurality of unit barrier fixing members (21b1, 21b2, 21b3, 21b4) may be set to a corresponding position between, of course, may be set to any position spaced apart by a predetermined distance without being limited to this position.

In this embodiment, setting a plurality of non-adhesive regions on the outer primary plywood 53b that is bonded to the secondary barrier 4 by the adhesive 10 is that the outer primary plywood 53b is the existing This is because, since it has a large area compared to that, partial bonding rather than bonding all parts with the adhesive 10 can lower the bonding defect rate of the adhesive 10 .

The plurality of first grooves GV1 may be formed in the outer primary plywood 53b in a direction perpendicular to the corner side of the storage tank.

Specifically, the plurality of first grooves GV1 may be formed along boundary portions of both sides of each of the plurality of non-adhesive regions.

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

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

Each of the first, second, third, and fourth unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 is made of a metal material and is adjacent to the upper part of the corner primary heat insulating wall 3b forming the integrated upper block UUB and is adjacent to each other. It can be installed, and is bent at a predetermined angle on the inside of the first surface and the second surface, for example, the same as the angle formed by the first surface and the second surface at different angles forming a storage space for accommodating liquefied gas It can be bent at an angle.

In this embodiment, the first, second, third, and fourth 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 insulating material (32b), and one outer primary plywood (33b) are sequentially stacked. Since it is composed of a structure, the first, second, and third 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 a plurality of units In the case of the existing upper block (UB) composed of the blocks (UB1, UB2, UB3, UB4), there is a structural difference in that each unit barrier fixing member is independently installed for each unit upper block.

Each of the first, second, third, and fourth unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 may be arranged at intervals in consideration of the contraction and expansion stress of the corner primary thermal insulation wall 3b, and the number of arrangement may vary depending on the size of the integrated upper block (UUB) made of a single board.

In addition, the first, second, and third units of the barrier fixing member (21b1, 21b2, 21b3, 21b4), the above-described plurality of upper slits (SL1) are the first, second, and third units of the barrier fixing member (21b1, 21b2, 21b3, 21b4), when formed at a corresponding position, it may be linked to the contraction or expansion of the corner primary insulating material (32b).

In general, the barrier fixing member is provided with a reinforcing member such as a stiffener along the edge of the rear surface so as to hold the upper portion of the corner primary heat insulating wall and firmly fix the upper block (UB). In the case of the first, second, third, and fourth unit barrier fixing members (21b1, 21b2, 21b3, 21b4), since they are disposed on one inner primary plywood (31b) having a flat top, the rear surface is inevitably flat.

Accordingly, each of the first, second, and third units of the barrier fixing members 21b1, 21b2, 21b3, and 21b4 is a corner 1 using a plurality of coupling members 211b provided on the rear surface, as shown in FIG. It may be installed on the upper part of the heat-blocking wall 3b. The coupling member 211b may be formed of a stud bolt and a nut.

Hereinafter, an inner first fixing part 3b1 and an inner second fixing part composed of an integrated upper block (UUB) using the first, second, third and fourth unit barrier fixing members 21b1, 21b2, 21b3, 21b4, respectively. The assembly process for fixing (3b2) will be described. Since each of the first, second, and third unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 is configured the same, the first unit barrier fixing member 21b1 will be described below as an example.

In the primary assembly process, the outer primary plywood (33b) of the inner first and second fixing parts (3b1, 3b2) having a plurality of first holes (81) is replaced with an inner second hole (82) having a plurality of second holes (82). The first and second fixing parts 3b1 and 3b2 of the first and second fixing parts 3b1 and 3b2 are bonded to the outer surface of the first insulating material 32b and the inner side of the first and second fixing parts 3b1 and 3b2 having a plurality of third holes 83. By bonding the primary plywood (31b) to the inner surface of the corner primary insulating material (32b) having a plurality of second holes (82), the assembly of the inner first and second fixing parts (3b1, 3b2) is completed, and , Insert the inner corner packing material (3b8) into the space portion between the inner first and second fixing parts (3b1, 3b2). Here, in the case of the corner inner packing material 3b8, after inserting the coupling member 211b in the secondary assembly process to be described later and making it close, inserting the corner inner packing material 3b8 and pressing the corresponding part, (+) 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 hole shape in which the outer primary plywood (33b) and the corner primary insulation material (32b) are connected by bonding, and the form in these communication holes The plug 9 may be sealed by being inserted, and the third hole 83 may be formed to a size into which the coupling member 211b can be inserted.

In the secondary assembly process, in the state in which the outer primary plywood (33b), the corner primary insulation material (32b), and the inner primary plywood (31b) are bonded, a plurality of formed in the inner primary plywood (31b) 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 tertiary assembly process, by bolting the coupling member 211b through the communication hole formed by the plurality of first and second holes 81 and 82, the first unit barrier fixing member 21b1 is the inner primary ply To be fixed to the upper surface of the wood (31b).

In the fourth assembly process, in a state in which the first unit barrier fixing member (21b1) is fixed to the inner primary plywood (31b), the foam is formed 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 insulating material 32b.

Then, the outer primary plywood (33b), the corner primary insulating material (32b), the inner primary plywood (31b) is formed by the bonding structure of the inner first fixing portion (3b1) and the inner second fixing portion The assembly process of the integrated upper block (UUB) is completed by inserting the reduced size inner bent portion (3b3) into the corner space portion between (3b2).

As described above, the integrated upper block (UUB) of this embodiment is an outer primary plywood 33b having a plurality of first holes 81, a corner primary insulating 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 by bonding, and then the first, second, third, and fourth unit barrier fixing members 21b1, 21b2, 21b3, and 21b4 are attached It has a structure that can be bolted together.

In this embodiment, although the reduced size of the inner bent portion 3b3 has been described as being installed at the end of the assembly process, it goes without saying that it may be installed between the primary assembly process and the secondary assembly process.

28, a corner outer packing material (5b5) can be inserted into 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 the present embodiment may be bonded to the upper surface of the adjacent lower blocks LB to connect the lower blocks LB.

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

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

The corner connection insulating wall 34b of the upper connection block (UBB), together with the corner primary insulating wall 3b of the integrated upper block (UUB), block heat intrusion from the outside while blocking an impact from the outside or liquefied gas from the inside It is designed to withstand the impact caused by sloshing, and may be installed between the barrier fixing member 21b and the corner connecting barrier 42b.

These corner connection insulating walls 34b, as shown in FIGS. 29 and 30, are provided on the inside of the first side and the second side, respectively, and the corner first connecting plywood to the outside of the barrier fixing member 21b (342b), the corner connection insulating material (341b), the corner second connection plywood (343b) comprising a corner first connection fixing part (34b1) and a corner second connection fixing part (34b2) that are sequentially stacked can do.

In this embodiment, the corner connection insulating wall 34b of the upper connection block UBB differs only in reference numerals and sizes when compared with the corner primary insulating walls 3b of the above-described integrated upper block UUB. , may be constitutively identical or similar.

The above-described corner connection insulating wall 34b is installed in a corner space portion between the corner first connection fixing part 34b1 and the corner second connection fixing part 34b2, and the corner connection bending part 34b3 made of a heat insulating material is formed. may include

The corner connecting bent portion 34b3 of this embodiment may have the same or similar shape as the inner bent portion 3b3 of the corner primary heat insulating 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 as or similar to the side shapes of the inner first and second fixing parts 3b1 and 3b2. A reduced-size corner connecting bent portion 34b3 may be inserted and installed in a corner space created by the first and second connecting and fixing corner portions 34b1 and 34b2 having the above-described side shape.

That is, the corner connection bent portion 34b3 has a height reduced from the overall height of each of the corner first and second connection fixing portions 34b1 and 34b2 in which both side heights perpendicular to the secondary barrier 4 are reduced, e.g. For example, the height of both sides of the corner connecting bent portion 34b3 may have a height within a range of 40% to 60% of the total height of each of the first and second connecting and fixing corners 34b1 and 34b2.

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

That is, the upper connection block (UBB) has a different size in the horizontal direction from the corner side of the storage tank, in comparison with the integrated upper block (UUB), the corner connection insulating wall 34b, the corner connection bending part 34b3, Each of the corner inner packing materials 34b4 may be the same as or similar to the corner primary insulating wall 3b, the inner bent portion 3b3, and the corner inner packing material 3b8 of the integrated upper block (UUB). In order to avoid it, a detailed description is abbreviate|omitted.

Through this, in this embodiment, as the size of the corner connecting bent portion 34b3 is reduced, the space in which thermal convection occurs (non-adhesive area between the corner connecting bent portion and the secondary barrier in the corner portion) can be reduced. By forming a corner inner packing material (34b4) in the space between the first and second connection fixing parts (34b1, 34b2) of the corner, which can be called a thermal convection path, the same as the first and second connection fixing parts (34b1, 34b2) of the corner Compared to the existing corner joint bend formed in height, the area affected by the temperature change is reduced, thereby reducing the thermal convection phenomenon.

In addition, in the present embodiment, by allowing the corner inner packing material 34b4 to be inserted to a predetermined depth into the corner connecting bent portion 34b3, the thermal convection phenomenon in the corner connecting bent portion 34b3 can be further reduced.

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

The second protrusion PT2 may extend out of the space by a predetermined length from the corner connection bent portion 34b3 inserted into the corner space portion generated 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 connecting bent portion 34b3, and the curved portion in contact with the corner connecting barrier 42b of the secondary barrier 4 is the corner connecting bent portion 34b3. Extends on the same line from the curved portion, and both sides perpendicular to the corner connecting barrier 42b of the secondary barrier 4 are extended to have a second step ST2 with both sides of the corner connecting bent portion 34b3. can

That is, the second protrusion PT2 of the present embodiment is formed to have a first step ST1 with respect to the corner connecting bent portion 34b3 by making it smaller than the size of the corner connecting bent portion 34b3, so that the second step ST2 ), the thermal convection path forms a curved path, thereby preventing the tropical convection phenomenon, which will be described later.

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

In this embodiment, in order to prevent thermal convection from occurring through the step space generated by the first and second protrusions PT1 and PT2, a stuffing piece SP is used.

The stuffing piece SP is, as shown in FIGS. 23 and 24 , a second protrusion PT2 provided in the corner connection bent portion 34b3 and a first protrusion PT1 provided in the inner bent portion 3b3. It can be inserted into the stepped space generated by

The stuffing piece SP may have a shape corresponding to the shape of the stepped space, and may be formed of the same or similar material as the inner bent part 3b3 or the corner connection bent part 34b3, for example, low-density polyurethane foam. Also, it may be formed of a vacuum insulation material using glass wool as the main raw material.

In addition, the stuffing piece SP, when the step space generated by the first and second protrusions PT1 and PT2 is, for example, 20 mm, may be formed to a thickness of 30 mm to completely seal the step space.

In a state in which the stuffing piece SP is inserted, the thermal convection path generated on both sides of the stuffing piece SP and the thermal convection path generated at the portion where the first and second protrusions PT1 and PT2 are in contact are curved paths. will achieve

Through this, in this embodiment, the first protrusion PT1 is provided on the reduced inner bent portion 3b3, and the second protrusion PT2 is provided on the reduced size corner connection bent portion 34b3, By closing the step space created by the first and second protrusions PT1 and PT2 with the stuffing piece SP, the thermal convection path generated between the integrated upper block UUB and the upper connection block UBB is protruded and A curved path is formed by the stuffing piece SP, so that the thermal convection phenomenon can be reduced.

On the other hand, 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 size of the inner bent part 3b3 and the corner connection bent part 34b3 reduced as in this embodiment ) was applied and the CFD analysis results for the case of applying the inner bent part 3b3 and the corner connection bent part 34b3 of the existing size, in the case of this embodiment, the heat flux was 8.73 W/m2, the average of the secondary barrier (4). The temperature was -90.15 degrees, the average temperature of the hull 7 was 8.79 degrees. In the existing case, the heat flux was 12.95 W/m2, 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. In view of this dew, it was found that the present embodiment was superior to the conventional one.

In addition, the upper connection block (UBB) of this embodiment has a squeeze-out confirmation means that can confirm the squeeze-out of the adhesive 10 when bonding the adhesive 10 to the upper portion of the corner secondary barrier 4 . need to be prepared.

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

The second groove (GV2) is formed in the corner side of the storage tank in the horizontal direction to the corner side of the storage tank in the corner second connection plywood 343b, which is an adhesive region, and the adhesive 10 is a corner connection bent part 34b3 that is a non-adhesive region. It may be formed in a portion adjacent to the rear edge of the corner second connecting plywood (343b) to confirm that the squeeze out.

Through this, the present embodiment forms a second groove (GV2) in the horizontal direction with the corner side of the storage tank in the corner second connection plywood (343b) of the upper connection block (UBB) connected to the corner connection barrier (42b). However, by forming in a portion adjacent to the rear edge of the corner second connecting plywood 343b, which is an adhesive area, the adhesive 10 is squeezed out to the corner connecting bent portion 34b3, which is a non-adhesive area. It can be directly confirmed with the naked eye. In addition, the adhesive 10 is squeezed out and can be bonded to the non-adhesive section beyond the second groove GV2, which reduces the non-adhesive section of the corner, thereby increasing the load applied to the secondary barrier 4 becomes large, it is possible to prevent a bonding bonding defect of the upper connection block (UBB).

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

The liquefied gas storage tank 1 ′ according to the comparative example may be, for example, a liquefied gas storage tank and the 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 same or different structure of the flat primary insulating wall 3a may be applied, but hereinafter, the flat primary insulating wall Regardless of the structure of (3a), the convection path due to the structural difference of the corner block (CB) and the resulting temperature difference will be described in comparison.

35 (a) and 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 the present embodiment. did it

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

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

The first convection blocking path CBP1 is stuffing inserted into the stepped space formed by the first protrusion PT1 provided in the inner bent portion 3b3 and the second protrusion PT2 provided in the corner connection bent portion 34b3. It is a blocking path corresponding to the 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, 3b2) and the corner first and second connecting fixing parts (34b1, 34b2) ) is a blocking path corresponding to

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

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

34, 35 and 36, the first and second convection paths CP1 and CP2 of the liquefied gas storage tank 1 of this embodiment are the third of the liquefied gas storage tank 1' of the comparative example. , it can be seen that the convection region is reduced compared to the four 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, the convection between the upper primary barrier (2) and the lower secondary barrier (4) However, as shown in Fig. 35 (a), in the case of the liquefied gas storage tank 1 of this embodiment, because the convection is blocked by the corner inner packing material 3b8, the liquefied gas storage tank according to the comparative example ( 1'), the temperature drop occurs less in the secondary barrier 4 of the liquefied gas storage tank 1 of this embodiment.

Due to this convection path difference, a temperature difference occurs in the secondary barriers 4 of the liquefied gas storage tank 1 of this embodiment and the liquefied gas storage tank 1' of the comparative example, respectively, in FIGS. 36 and 37 (a) ), (b), and (c) will be described.

The temperature measurement condition is measured while changing the positions of the first, second, and third temperature sensors (TL1, TL2, TL3) in a state where the temperature of the primary barrier 2 is -196 degrees and the temperature of the hull 7 is 10 degrees. Although not shown, measurements were made by attaching a temperature sensor to the same position in the liquefied gas storage tank 1' of the comparative example.

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

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

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

As described above, it can be seen that the convection path of the liquefied gas storage tank 1 of the present embodiment is narrowed and decreased compared to the liquefied gas storage tank 1 ′ of the comparative example as described above.

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

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto. It will be clear that the transformation or improvement is 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: 2nd unit barrier fixing member 21b3: 3rd unit barrier fixing member
21b4: fourth unit barrier fixing member 211b: coupling member
3: Primary thermal insulation wall 3a: Flat primary thermal insulation wall
31a: flat primary plywood 32a: flat primary insulation material
33a: flat connection insulation wall 331a: flat connection plywood
332a: flat connection insulation material 3b: corner primary insulation wall
3b1: inner first fixing portion 3b2: inner second fixing portion
31b: inner primary plywood 32b: corner primary insulation material
33b: outer primary plywood 3b12: inner intermediate fixing part
31b12: inner middle plywood 32b12: corner intermediate insulation
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 connecting plywood 343b: corner second connecting plywood
34b3: corner connection bent part 34b3': corner first half bent part
34b3": Corner second half bent part 34b4: Corner inner packing material
3b3: inner bent part 3b3': inner first half bent part
3b3": inner second half-bend 3b31: insulation material
3b32: insulation material 3b33: outer insulation material
3b34: inner insulation material 3b35: insulation material
3b36: insulation material 3b37: vacuum insulation panel
3b4: inner first packing material 3b5: inner second packing material
3b6, 34b6: first bonding unit 3b7, 34b7: second bonding unit
3b8, 34b8: inner packing material of the first and second corners 4: secondary barrier
41a: flat secondary barrier 42a: flat connection barrier
41b: corner secondary barrier 42b: corner connecting barrier
5: 2nd insulating wall 5a: Flat 2nd insulating 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: Beveled plywood
52b: corner secondary insulation 53b: outer secondary plywood
5b12: outer intermediate fixing part 51b12: outer intermediate plywood
52b12: outer intermediate insulation material 53b12: inner intermediate insulation material
5b3: outer bent portion 5b31: insulation material
5b32: insulation material 5b4: outer packing material
5b5: corner outer packing material 6: mastic
7: Hull 81: Hall 1
82: 2nd hole 83: 3rd hole
9: Foam plug 10: Glue
CB: Corner Block CBP1: First Convection Blocking Path
CBP2: 2nd convection blocking path CP1: 1st convection path
CP2: 2nd convection path CP3: 3rd convection path
CP4: 4th convection path CF1: 1st chamfer
CF2: second chamfer ED: division 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: First step
ST2: Second step SS: Step space
TL1: first temperature sensor TL2: second temperature sensor
TL3: third temperature sensor

Claims (7)

A liquefied gas storage tank comprising a corner block disposed at a corner portion where the first surface and the second surface at different angles meet to form a storage space for accommodating the liquefied gas,
The corner block is
A lower block provided inside the first and second surfaces and made of a single board, an upper block bonded to the secondary barrier of the lower block, and bonding to the secondary barrier on the upper surface of the lower block disposed adjacent to each other Composed of an upper connection block that is coupled to connect the lower blocks,
The upper block is
An inner first fixing part provided on the inside of the first surface and the second surface and bonded to the secondary barrier, and having a structure in which an inner primary plywood, a corner primary insulation material, and an outer primary plywood are laminated; an inner second fixing part; and
and an inner bent part installed in a corner space portion between the inner first fixing part and the inner second fixing part,
The inner bent portion,
an inner first half-bend portion coupled to a side surface of the inner first fixing portion;
an inner second half-bend portion coupled to a side surface of the inner second fixing portion; and
A liquefied gas storage tank made of a corner first inner packing material inserted and installed in a space between the inner first half-bend portion and the inner second half-bend portion. According to claim 1, wherein the inner first half-bend portion and the inner second half-bend portion,
A liquefied gas storage tank having a triangular shape in which the inner bent portion is symmetrically cut along a direction in which the corner portion is equally divided. According to claim 1, wherein the inner first half-bend portion,
A side perpendicular to the secondary barrier is bonded to the side of the inner first fixing part by a first bonding part,
The inner second half-bend portion,
A liquefied gas storage tank in which a side perpendicular to the secondary barrier is bonded to a side surface of the inner second fixing unit by a second bonding unit. According to claim 1, The corner first inner packing material,
A liquefied gas storage tank formed to have a (+) tolerance to completely seal the space while being inserted into the space between the inner first half-bend and the inner second half-bend. The method according to claim 1, wherein the inner first and second half-bends,
A chamfer is formed at a right angle corner where the bottom surface, which is not attached to the secondary barrier, and the side surfaces of the inner first and second fixing parts meet,
The chamfer is
A liquefied gas storage tank for confirming that the adhesive is squeezed out toward the inner first and second half-bend portions, which are non-adhesive areas, when bonding the inner first and second fixing parts with an adhesive on the secondary barrier. . According to claim 1, wherein the upper block,
Providing each of the inner first fixing part, the inner second fixing part, the inner first half-bending part, and the inner second half-bending part separated into four pieces,
Bonding the inner first fixing portion and the inner first half-bending portion using a first bonding portion,
Bonding the inner second fixing portion and the inner second half-bending portion using a second bonding portion,
Bonding the inner first fixing portion bonded to the inner first half-bend portion to the secondary barrier using an adhesive,
Bonding the inner second fixing portion bonded to the inner second half-bend portion to the secondary barrier using an adhesive,
A liquefied gas storage tank that is assembled by inserting the corner first inner packing material into a space created between the inner first half-bend portion and the inner second half-bend portion by bonding to the secondary barrier. According to claim 1, wherein the upper connection block,
A corner first connector having a structure in which a corner first connecting plywood, a corner connecting plywood, and a corner second connecting plywood are laminated, respectively provided on the inside of the first surface and the second surface and bonded to the secondary barrier government and corner second connection fixed part; and
and a corner connection bent part installed in a corner space portion between the corner first connection fixing part and the corner second connection fixing part,
The corner connection bent portion,
a corner first half-bend part coupled to a side surface of the corner first connection fixing part;
a corner second half-bend portion coupled to a side surface of the corner second connection fixing portion; and
A liquefied gas storage tank made of a corner second inner packing material inserted and installed in the space between the corner first half-bend portion and the corner second half-bend portion.

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