KR102513638B1 - liquefied gas tank and ship having the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same, a primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulation wall disposed outside the primary barrier, and the above It includes a secondary barrier provided outside the primary thermal insulation wall and a secondary thermal insulation wall disposed outside the secondary barrier, and thermal insulation between the primary barrier and the secondary barrier and on the outside of the secondary barrier. walls forming spaces; and a dome provided on the wall constituting an upper surface of the storage space to close the heat insulation space, wherein the dome includes: an outer wall having a predetermined height upward of the storage space; an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end; a support extending downward from the upper wall inside the outer wall; And a connection barrier for sealing between the secondary barrier and the support, wherein the support includes a vertical portion positioned outside the secondary barrier and parallel to the outer wall, and a lower portion of the vertical portion bent toward the inside. A bent portion and a second step relieving means provided at an inner end of the bent portion and to which the connection barrier is fixed, wherein the lower end of the connection barrier is fixed to the second barrier and an upper portion surrounds the second step relieving means. while being bent outward and fixed to the upper surface of the second step eliminating means.

Description

Liquefied gas storage tank and ship containing the same {liquefied gas tank and ship having the same}

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

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

LNG carriers 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. A liquefied gas storage tank (so-called "cargo hold") is installed to store in a cryogenic liquid state.

In the liquefied gas storage tank, Boil Off Gas (BOG) can be generated by heat intrusion from the outside, and through an adiabatic design, the Boil Off Rate (BOR), which is the vaporization rate of the boil-off gas, can be lowered. This is the core technology of liquefied gas storage tank design.

Therefore, such a liquefied gas storage tank may have at least two layers of insulation space, and an Interbarrier Space (IBS) and an Insulation Space (IS) are provided in an outward direction based on the space in which LNG is stored.

In addition, a dome is formed on the upper surface of the liquefied gas storage tank for loading/unloading of LNG. However, the dome can be applied with a structure to secure insulation performance by supplying nitrogen gas to the inside of the IBS while sealing the IBS and IS. In the efficient structure of the dome for sealing and insulation, continuous research and development have been made are losing

The present invention has been created to solve the problems of the prior art as described above, and an object of the present invention is to provide a liquefied gas storage tank capable of stably implementing sealing of barriers and a ship including the same.

A liquefied gas storage tank according to an aspect of the present invention includes a primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulation wall disposed outside the primary barrier, and the primary insulation. It includes a secondary barrier provided outside the wall and a secondary insulation wall disposed outside the secondary barrier, and a thermal insulation space is formed between the primary barrier and the secondary barrier and outside the secondary barrier. wall to do; and a dome provided on the wall constituting an upper surface of the storage space to close the heat insulation space, wherein the dome includes: an outer wall having a predetermined height upward of the storage space; an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end; a support extending downward from the upper wall inside the outer wall; And a connection barrier for sealing between the secondary barrier and the support, wherein the support includes a vertical portion positioned outside the secondary barrier and parallel to the outer wall, and a lower portion of the vertical portion bent toward the inside. A bent portion and a second step relieving means provided at an inner end of the bent portion and to which the connection barrier is fixed, wherein the lower end of the connection barrier is fixed to the second barrier and an upper portion surrounds the second step relieving means. while being bent outward and fixed to the upper surface of the second step eliminating means.

Specifically, the bent part is provided with a fixing end for fixing the second step solving means, and the second step solving means has a U-shape, the upper surface is overlapped with the bent part and fixed, and the lower surface is fixed to the fixed end can be fixed

Specifically, the second step difference eliminating means may have an inner surface parallel to the second barrier.

Specifically, the connection barrier may be provided so as to come into contact with the inner surface of the secondary step difference eliminator but not to be bonded.

Specifically, the connection barrier may be provided so that a lower surface fixed to the secondary barrier and an upper surface fixed to an upper surface of the secondary step difference eliminator form a right angle.

A ship according to one aspect of the present invention has the liquefied gas storage tank.

The liquefied gas storage tank according to the present invention and a ship including the same can ensure sealing of the insulation space by securing a structure that implements efficient and stable fixation to the secondary barrier and the like.

In addition, the liquefied gas storage tank and the ship including the same according to the present invention can maintain the confidentiality of the liquefied gas because the connection barrier is connected to and fixed to one side of the secondary barrier, the insulation material, and the support.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.
2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.
4 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.
5 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.
6 is a partial cross-sectional view of a liquefied gas storage tank according to a fifth embodiment of the present invention.
7 is a partial cross-sectional view of a liquefied gas storage tank according to a sixth embodiment of the present invention.
8 is a partial cross-sectional view of a liquefied gas storage tank according to a seventh embodiment of the present invention.
9 is a partial cross-sectional view of a liquefied gas storage tank according to an eighth embodiment of the present invention.
10 is a partially exploded perspective view of a liquefied gas storage tank according to an eighth embodiment of the present invention.
11 is a partial perspective view of a liquefied gas storage tank according to an eighth embodiment of the present invention.
12 is an exploded perspective view of a corner barrier of a liquefied gas storage tank according to an eighth embodiment of the present invention.
13 is a perspective view of a corner step eliminating means of a liquefied gas storage tank according to a ninth embodiment of the present invention.
14 is an exploded perspective view of a corner barrier of a liquefied gas storage tank according to a ninth embodiment of the present invention.
15 is a partial cross-sectional view of a liquefied gas storage tank according to a tenth embodiment of the present invention.

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 adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

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

For reference, the present invention includes a ship equipped with a liquefied gas storage tank described below. At this time, the ship can be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and is a concept that includes all gas carriers, merchant ships that carry non-gas cargo or people, FSRU, FPSO, Bunkering vessel, and offshore plants. .

Hereinafter, each embodiment will be described with reference to each drawing, but with reference to FIG. 1 first, items commonly included in the embodiments will be described first.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.

The liquefied gas storage tank 1 of the present invention is mounted on a hull (not shown). At this time, the liquefied gas storage tank 1 may be a membrane type in which the bulkhead structure of the hull forms the outer wall 21 of the tank, or may be an independent type in which the liquefied gas storage tank 1 is drawn in and installed in the inner space of the hull.

The type of the liquefied gas storage tank 1 is not particularly limited, and the location where the liquefied gas storage tank 1 is mounted on the hull (inside a ship or outboard such as an upper deck) is also not limited. However, the liquefied gas storage tank 1 of the present invention may have a structure in which a heat insulating layer is disposed in an inward direction.

For reference, in this specification, the liquefied gas storage tank 1 will be described assuming that it is a membrane type in which an insulation layer is directly installed on the hull bulkhead. However, since the liquefied gas storage tank 1 may be provided as an independent type, it is noted that the expression hull below can be interpreted as replacing the external body of the liquefied gas storage tank 1.

The liquefied gas storage tank 1 has a storage space. Liquefied gas may be stored in the storage space, and the liquefied gas may be LNG. Hereinafter, it will be assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to be liquefied for storage because its boiling point is lower than room temperature, in addition to LNG, and covers all substances (LPG, ethane, hydrogen, ammonia, etc.) with calorific value. can do.

The storage space of the liquefied gas storage tank 1 may form a closed space surrounded by the wall 10. However, an opening (not shown) is provided on the upper surface of the wall 10 for the inflow and outflow of liquefied gas, and a dome 20 is installed in the opening. That is, the liquefied gas storage tank 1 may include a wall 10 and a dome 20.

The wall 10 forms a storage space for accommodating liquefied gas and also forms an adiabatic space. Specifically, the wall 10 has a primary barrier 11, a primary insulation wall 12, a secondary barrier 13, and a secondary insulation wall 14 from the inside to the outside. For reference, in this specification, the inside means a direction toward the inside of the space where the liquefied gas is stored, and the outside means the opposite direction.

The primary barrier 11 forms a storage space for accommodating liquefied gas. The primary barrier 11 may be made of a metal material to suppress brittle fracture due to low-temperature liquefied gas, and is composed of, for example, SUS, INVAR, or the like.

In addition, a wrinkled or concave-convex structure may be formed on the primary barrier 11 to prepare for sloshing. As these primary barriers 11 are overlapped with each other and sealed by welding, the entire storage space (except for the dome 20) is made into a closed space.

The primary barrier 11 has a function as a barrier to prevent leakage of liquefied gas. In addition, since the secondary barrier 13 to be described later also serves as a barrier to prevent leakage of liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that implements leakage prevention in at least two layers.

The primary insulation wall 12 is disposed outside the primary barrier 11 and implements a primary insulation function. The primary insulating wall 12 may have a laminated form of plywood 121 and insulating block 122 . The plywood 121 is provided on the inside of the primary insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood 121. The anchoring unit is a configuration provided for overlap welding of the primary barrier 11 and may be made of the same/similar metal material as the primary barrier 11.

The insulating block 122 is provided on the outer side of the primary insulating wall 12 and has insulating properties. The insulating block 122 may be made of a polyurethane foam block or a box block containing an insulating material. The insulation block 122 may be bonded and fixed to the secondary barrier 13 to be described later through bonding or the like, or may be fixed to the hull or the like by bolting.

The primary thermal insulation wall 12 is disposed in the closed space between the primary barrier 11 and the secondary barrier 13, the space in which the primary thermal insulation wall 12 is disposed can form a thermal insulation space, the primary The heat insulating space in which the heat insulating wall 12 is disposed may be referred to as an Interbarrier Space (IBS).

The primary heat insulating wall 12 provided at the highest position may be located below the upper wall 22 of the dome coaming 20a to be described later. This is because the connection barrier 24 must be constructed for sealing between the upper wall 22 of the dome coaming 20a and the secondary barrier 13.

That is, according to the construction sequence, the secondary barrier 13 is provided on the secondary insulation wall 14 and the primary insulation wall 12 is provided on the secondary barrier 13, the uppermost primary insulation wall ( 12) is located below the upper wall 22 and exposes a part of the secondary barrier 13. At this time, as the connection barrier 24 is installed between the exposed secondary barrier 13 and the upper wall 22, the dome coaming 20a and the secondary barrier 13 are sealed and connected to each other.

Thereafter, the gap between the uppermost primary insulating wall 12 and the upper wall 22 of the dome coaming 20a may be filled with the finished insulating wall 12a to cover the connection barrier 24 . The finish insulating wall 12a may have a structure including a plywood (not shown) and a heat insulating block (not shown) identically / similarly to the primary insulating wall 12 .

The inner surface of the primary insulating wall 12 and the finished insulating wall 12a may be provided side by side with each other, and the primary barrier 11 on the inner surface of the primary insulating wall 12 and the inner surface of the finished insulating wall 12a. ) can be installed.

The secondary barrier 13 is provided outside the primary thermal insulation wall 12 . The secondary barrier 13 has a sealing function to prevent leakage of liquefied gas together with the primary barrier 11, and the secondary barrier 13 prevents leakage of liquefied gas when the primary barrier 11 is damaged. will prevent

The secondary barrier 13 may be made of the same/similar metal material as the primary barrier 11, or may be made of a material different from that of the primary barrier 11. For example, the secondary barrier 13 may be formed of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet, or a composite sheet in which metal sheets are laminated on both sides of a glass fiber sheet. Alternatively, the secondary barrier 13 may be made of a metal material such as SUS or INVAR.

The secondary barrier 13 may be laminated on the secondary insulation wall 14 . However, in order to seal the gap between the secondary insulation walls 14, a separate secondary barrier 13 is laminated. The secondary barrier 13 on the secondary insulation wall 14 is made of a relatively rigid material, , The secondary barrier 13 between the secondary insulation walls 14 may be provided with a relatively flexible material in preparation for contraction and expansion.

The secondary insulation wall 14 is disposed outside the secondary barrier 13 . The secondary insulation wall 14 has a thermal insulation function similar to the primary insulation wall 12, and has a structure in which plywood 141 and insulation block 142 are laminated in the same / similar to the primary insulation wall 12. It is done.

However, the stacking order of the plywood 141 and the insulating block 142 of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12 . The primary insulation wall 12 is provided with a plywood 121 provided with an anchoring unit for welding fixation of the primary barrier 11, while the secondary insulation wall 14 is fixed to the hull side. A plywood 141 may be provided on the outer surface.

The secondary insulation wall 14 may be fixed to the inner surface of the hull using bolts (not shown), and may also be fixed using mastic 143. Mastic 143 is an adhesive and fixes the plywood 141 of the secondary insulation wall 14 to the hull.

The secondary insulation wall 14 is disposed in a closed space between the secondary barrier 13 and the hull, and the space in which the secondary insulation wall 14 is disposed may be referred to as IS (Insulation Space) as a secondary insulation space. there is.

That is, the wall 10 goes from the inside to the outside in the order of the primary barrier 11 - IBS (primary insulation wall 12) - secondary barrier 13 - IS (second insulation wall 14) - hull It is provided to be laminated, and the insulation space, which is the IBS and the IS, is closed by a dome 20 to be described later.

In this way, the storage space of the liquefied gas storage tank 1 may be formed by the wall 10 having the double barrier and the double insulation wall (insulation space). The wall 10 includes a flat or curved surface or an inclined surface to form a storage space of various shapes.

The dome 20 is provided on the wall 10 forming the upper surface of the storage space. The wall 10 forming the storage space has an open top surface for the inflow and outflow of liquefied gas or boil-off gas, and the dome 20 is installed and finished at the open portion.

At this time, the wall 10 constituting the upper surface of the storage space may be provided to protrude upward at a certain height from the open portion to form a protrusion (not shown), and a dome 20 may be installed on the upper end of the protrusion.

The dome 20 closes the insulation space formed in the wall 10. As described above, the insulation space is provided on the inside and outside of the secondary barrier 13 in the wall 10, and the dome 20 may close each insulation space to be separated from each other.

The dome 20 includes a dome coaming 20a fixed to the wall 10 extending upward from the upper surface of the storage space. The dome coaming 20a is provided in the form of a hollow column and may have, for example, a square column shape.

The dome coaming 20a can make the IBS and IS separate from each other and form a closed space through a specific structure to be described later, and a nitrogen line (not shown) is provided to pass through the dome coaming 20a so as to penetrate the nitrogen in the insulation space. The inflow and outflow of can be implemented.

A dome cover (not shown) may be provided on the upper side of the dome coaming 20a. A line through which liquefied gas or boil-off gas can flow in and out may be disposed in the dome cover, and an upper end of a pump tower (not shown) is fixedly installed in the dome cover.

Hereinafter, the structure of the dome 20 of each embodiment will be described in detail with reference to FIG. 2 and the like. However, it should be noted that the structure of the dome 20 described below is the structure of the dome coaming 20a.

For reference, in the description of the second embodiment below, the explanation will be focused on the differences of the corresponding embodiment compared to the previous contents, and the omitted description will be replaced with the previous contents.

2 to 8 are partial cross-sectional views of a liquefied gas storage tank according to the present invention, and FIGS. 2 to 8 show first to seventh embodiments, respectively.

2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.

Referring to FIG. 2, the dome 20 of the liquefied gas storage tank 1 according to the first embodiment of the present invention includes an outer wall 21, an upper wall 22, a support 23, and a connection barrier 24. include

The outer wall 21 has a certain height upward of the storage space. The outer wall 21 may be provided parallel to the outer surface of the protrusion and may be integrally fixed with the hull. It is also possible that a part of the hull is provided to replace the outer wall 21.

The outer wall 21 may be provided in a polygonal column shape, and lines may be provided to pass through each side. However, lines for supplying nitrogen to the insulation space/discharging nitrogen from the insulation space may be provided on opposite sides of the dome coaming 20a.

A horizontal reinforcing member 211 may be provided on the outside of the outer wall 21 . Depending on the height at which the outer wall 21 extends upward, the structural strength of the dome coaming 20a is secured by adding a reinforcing material 211 to the outer circumference of the outer wall 21 .

At this time, the reinforcing material 211 may be disposed between the trunk deck and the upper wall 22 of the hull. Of course, when the height of the outer wall 21 extending between the trunk deck and the upper wall 22 is not high, the reinforcing member 211 can be omitted, and the trunk deck can serve as the reinforcing member 211 .

The upper wall 22 is supported by the outer wall 21 and a dome cover is seated on at least a portion thereof. The upper wall 22 may be configured to be vertically fixed to the top of the outer wall 21, and may be provided horizontally and provided in parallel with the wall 10 forming the upper surface of the storage space.

The upper wall 22 may be provided in a form protruding outward from the outer wall 21, and a dome cover may be inserted into the inside. In addition, since the upper wall 22 has a width equal to or greater than the thickness of the wall 10, it is possible to cover the insulating spaces of the wall 10.

The outer end of the upper wall 22 is provided to protrude outward compared to the outer wall 21, and a vertical web member (not shown) is provided between the upper wall 22 and the reinforcing member 211 to increase structural strength. .

A primary barrier 11 may be connected to the inside of the upper wall 22 . To this end, a first step difference eliminating means 221 is provided at the inner end of the upper wall 22 . The first level difference eliminating means 221 may be a structure having a U-shape consisting of upper and lower surfaces and a vertical surface therebetween, and the upper surface may overlap and be fixed to the inner end of the upper wall 22 .

However, since the height of the first level difference eliminating means 221 may be greater than the thickness of the upper wall 22, the fixing end 222 is provided to firmly fix the first level difference eliminating means 221 to the inner end of the upper wall 22. can be used The fixing end 222 may extend downward from the inner end of the upper wall 22 so that both the upper and lower surfaces of the primary step difference eliminator 221 are fixed to the upper wall 22 .

The support 23 extends downward from the upper wall 22 outside and inside the outer wall 21 . When the support 23 covers the insulation spaces through the upper wall 22, it will be used to separate the inner insulation space IBS of the secondary barrier 13 and the outer insulation space IS of the secondary barrier 13. can

The support 23 is connected to the secondary barrier 13 through a connection barrier 24 to be described later, so that the outer insulation space of the secondary barrier 13 communicates with the outside of the support 23 and the secondary barrier 13 The inner heat insulation space of the is in communication with the inside of the support (23). However, since the upper end of the support 23 is fixed to the upper wall 22, the support 23 divides the insulation space in the inner and outer directions.

The support 23 has a vertical portion 231 and an inclined portion 232 . The vertical portion 231 is provided to extend downward from the lower surface of the upper wall 22 . At this time, the vertical portion 231 is provided parallel to the secondary barrier 13 on the outside compared to the secondary barrier 13 and is provided parallel to the outer wall 21 on the inside compared to the outer wall 21.

In order to secure a stable structure when the dome cover through which various lines pass is seated on the dome coaming 20a, the support 23 may extend downward from the upper wall 22 at a point outside the secondary barrier 13. At this time, in order to interconnect the support 23 and the secondary barrier 13 to seal the insulation space outside the secondary barrier 13, in this embodiment, the support 23 may be provided with an inclined portion 232.

The inclined portion 232 is provided below the support 23 and is inclined at an acute angle. Specifically, the inclined portion 232 is inclined inwardly from the lower end of the vertical portion 231 toward the lower side, and the inclined angle forms an acute angle compared to the case where the vertical portion 231 is further extended.

The inclined portion 232 extends to a point adjacent to the secondary barrier 13, but the lower end of the inclined portion 232 and the secondary insulating wall 14 are arranged to be spaced apart in the vertical direction, preventing mutual interference during installation. It can be prevented. The extent to which the inclined portion 232 extends downward may be determined according to the material (particularly, the degree of bendability) of the connection barrier 24 to be described later.

The connection barrier 24 may be fixed to the inner surface of the inclined portion 232 and the inner heat insulating material 26 may be fixed. Conversely, an outer heat insulating material 25 is provided on the outer surface of the inclined portion 232, which will be described later.

The connection barrier 24 seals between the secondary barrier 13 and the support 23 to divide the insulation space inside and outside the secondary barrier 13 . The connection barrier 24 may be made of the same/similar material as the secondary barrier 13, but may be made of a material that is flexible compared to the secondary barrier 13 provided on the secondary insulation wall 14.

The connection barrier 24 may be made of a material capable of bending during installation. For example, the connection barrier 24 may be formed of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet.

The connection barrier 24 may have a lower end fixed to the secondary barrier 13 and an upper end bent outward relative to the lower end and fixed to the inclined portion 232 . For example, the operator may fix the lower end of the connection barrier 24 to the secondary barrier 13 first, and then fold the upper end outward and attach it to the inclined portion 232 by bonding or the like.

The lower end of the connection barrier 24 is located above the height of the primary insulation wall 12, so that the primary insulation wall 12 can be fixed to the secondary barrier 13 before construction of the connection barrier 24. . Of course, as described above, the connection barrier 24 constructed above the primary insulation wall 12 may be finished by constructing the finishing insulation wall 12a.

For reference, it should be noted that the expression "curved" in this specification includes not only forming a curved surface without forming a vertex, but also encompassing bending to form a vertex.

The connection barrier 24 is made of a relatively flexible material and may be prepared to allow bending. However, if the degree of bending of the connection barrier 24 reaches a right angle, stress may be concentrated at the bent corner of the connection barrier 24 . In addition, there is also a concern that the connection barrier 24 itself may be torn. Furthermore, when the dome coaming 20a forms a polygonal column, it becomes very difficult to join the connecting barrier 24 at the corner portion.

Therefore, in the present invention, the support 23 is provided with the inclined portion 232 so that the degree of bending of the connection barrier 24 does not reach a right angle but forms an acute angle, so that stress is concentrated in a specific part of the connection barrier 24 can prevent it from happening.

In this embodiment, it has been described that the lower end of the inclined portion 232 of the support 23 and the secondary insulating wall 14 can be spaced apart, but the connection barrier 24 is formed between the secondary barrier 13 and the inclined portion 232. ) It may be provided to be bent at an acute angle toward the outside in the spaced space between.

At this time, an outer heat insulating material 25 may be provided on the outside of the bent portion of the connection barrier 24 . The inner surface of the outer insulator 25 facing the connection barrier 24 may be provided in a curved shape so that the connection barrier 24 can be gently bent without bending to support the curved portion of the connection barrier 24 .

The space where the outer heat insulating material 25 is provided is an outer heat insulating space of the secondary barrier 13 and may be filled with a non-explosive gas such as nitrogen. For reference, the internal pressure may be set in the order of IS > storage space > IBS, but is not limited thereto.

The outer heat insulating material 25 is filled between the outer wall 21 and the support 23 . At least a part of the outer heat insulating material 25 may be provided parallel to the secondary heat insulating wall 14, and may implement a secondary heat insulating function together with the secondary heat insulating wall 14. However, the outer heat insulating material 25 may be made of the same/similar material or a different material from the secondary heat insulating wall 14, and for example, the outer heat insulating material 25 may be made of glass wool, reinforced polyurethane foam, or the like.

The outer heat insulating material 25 is filled in the space between the support 23 and the outer wall 21 and may have a height extending from the upper wall 22 to the lower end of the support 23 . That is, the lower end of the outer heat insulating material 25 may be located below the inclined portion 232 and come into contact with the secondary heat insulating wall 14 .

The outer heat insulator 25 may be divided into at least two parts in consideration of construction efficiency and the like, may be integrated after construction, and may be partially made of different materials. For example, the outer portion of the support 24 of the outer insulator 25 may be made of glass wool or the like, and the lower portion of the support 24 of the outer insulator 25 may be made of polyurethane foam or the like.

The inner surface of the outer portion of the support 24 of the outer heat insulator 25 has a vertical surface and an inclined surface corresponding to the support 23 . That is, in the outer insulator 25, a part of the inner surface facing the vertical portion 231 of the support 23 is provided in the form of a vertical plane, and a part of the inner surface facing the inclined portion 232 of the support 23 is in the form of an inclined plane. may be provided.

In addition, in the outer heat insulating material 25, the portion located between the lower end of the inclined portion 232 and the secondary insulating wall 14 has an outer portion having a rectangular shape and an inner portion having a curved surface so as to support the curved portion of the connection barrier 24. It can be made in the form of a combination of parts. That is, the outer heat insulator 25 has a shape protruding inward compared to the inclined portion 232 so as to support the curved portion of the connection barrier 24 at the part where the support 23 and the secondary insulation wall 14 are spaced apart. It may have, and may be provided in a form divided into two or more for the efficiency of construction.

The inner heat insulating material 26 is fixed to the inside of the vertical portion 231 and has an inner surface parallel to the inner surface of the secondary barrier 13 or the connection barrier 24 . The inner heat insulating material 26 compensates for the fact that the vertical portion 231 of the support 23 is biased outward compared to the secondary barrier 13, and may be provided to secure a flat surface for installation of the finished heat insulating wall 12a. .

The inner heat insulating material 26 may be made of a material in which wood is overlapped in multiple layers, and may be fixed to the vertical portion 231 with mastic 261 as described for the secondary heat insulating wall 14 . The mastic 261 may be applied to the vertical portion 231 and the inclined portion 232 .

In addition, in order to firmly fix the position of the inner insulator 26, a stud 2311 may be provided in the vertical portion 231 in an inward direction, and the inner insulator 26 penetrates the stud 2311 and attaches to the stud 2311. A fixed fixture 262 (such as a nut) may be used.

The inner insulator 26 has an outer surface corresponding to the support 23 and has a vertical surface and an inclined surface. That is, the inner heat insulator 26 fills the space provided between the extended outer surface and the support 23 when the outer surface of the primary heat insulating wall 12, which is laminated on the inner surface of the secondary barrier 13, is extended upward. can have

In addition, the inner heat insulator 26 may also be applied between the primary level gap eliminator 221 and the vertical portion 231 of the support 23 . The inner heat insulating material 26 may be provided in various ways to make the lower part of the upper wall 22 and the inner part of the support 23 into a square shape in order to install the finished insulating wall 12a, and may be partially made of different materials. can For example, the inner insulator 26 fixed to the vertical portion 231 and the inclined portion 232 of the support 23 is made of a wood material to secure a fixing force, and the inner insulator 26 fixed to the lower surface of the upper wall 22 ) may be provided with a polyurethane material for an insulation effect.

In this way, in this embodiment, the support 23 is placed at the lower end of the upper wall 22 in the dome coaming 20a, and the secondary barrier 24 is used as the connection barrier 24 to separate the insulation space inside and outside the secondary barrier 13 ( 13) and the support 23, but by applying a structure in which the connection barrier 24 is bent at an acute angle and fixed to the support 23, the durability, gas-tightness and sealing function of the connection barrier 24 can guarantee

In addition, when the connection barrier 24 is bent only at an acute angle that is less than a right angle, it is possible to secure more bonding sections when compared to a case where the connection barrier 24 is bent at a right angle, thereby increasing sealing stability.

3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.

Referring to FIG. 3, the liquefied gas storage tank 1 according to the second embodiment of the present invention applies the same inclination as described in FIG. There is a difference in that a is provided.

The support 23 of this embodiment is provided to include the vertical portion 231, and the inclined portion 232 may not be provided. At this time, the secondary insulation wall 14 is provided with a chamfer portion 146 at an upper end facing the support 23 .

The chamfer portion 146 is provided so as to be inclined toward the vertical portion 231 at the upper end of the secondary insulation wall 14, and the corner of the insulation block 142 of the secondary insulation wall 14 is cut out. can

At this time, the upper end of the chamfer portion 146 may be provided to be placed in a position relatively parallel to the vertical portion 231 of the support 23 in the vertical direction, and the secondary barrier 13 provided on the secondary insulation wall 14 is provided to cover at least a portion of the chamfer portion 146.

Of course, unlike this, the secondary barrier 13 is not provided on the chamfer portion 146, but is provided only on the inner surface perpendicular to the secondary insulation wall 14, and the upper end of the connection barrier 24 is fixed to the support 23 The lower end extends to the vertical inner surface of the secondary insulation wall 14, is bent inward between the support 23 and the secondary insulation wall 14, and the chamfer portion 146 covers all of the chamfer portion 146 It is also possible to be bent outward from the lower end of the sealing to the secondary barrier (13). In this case, the connection barrier 24 may be divided into two or more and may be configured to be mutually sealed and connected.

In this embodiment, the connection barrier 24 has a lower end fixed to the secondary barrier 13 located in the chamfer portion 146 and an upper end bent inward relative to the lower end to be fixed to the vertical portion 231 . In other words, the upper end of the connection barrier 24 is fixed to the inner surface of the vertical portion 231, and the lower end is bent inward and seated on the chamfer portion 146, so that it is connected to the secondary barrier 13 to implement sealing.

At this time, since the chamfer portion 146 of the secondary insulation wall 14 has a chamfer shape with diagonally cut edges, the connection barrier 24 is formed between the chamfer portion 146 and the vertical portion 231 on the inside can be bent at an acute angle towards

Of course, the chamfer portion 146 may also be cut so that at least a portion thereof forms a curved line instead of an oblique line. However, in this embodiment, by limiting the bending of the connection barrier 24 to an acute angle, it is possible to secure durability of the connection barrier 24 and guarantee a sealing function.

The lower end of the vertical part 231 of the support 23 may be spaced upwards compared to the secondary insulating wall 14, but the inclined part between the vertical part 231 and the secondary insulating wall 14 is previously shown in FIG. It may be provided as an empty space similarly between the and the secondary insulation wall 14. Of course, it is also possible that the outer heat insulating material 25 is filled.

The outer insulator 25 is provided to be filled between the vertical portion 231 and the outer wall 21, and considering the shape of the support 23 of this embodiment, the outer insulator 25 may be provided in a simple rectangular parallelepiped shape. .

The inner heat insulating material 26 is provided inside the vertical portion 231 of the support 23 . The outer surface of the inner insulator 26 may be fixed through studs 2311 provided on the vertical portion 231 of the support 23, and may also be bonded to the vertical portion 231 using a mastic 261.

The inner insulator 26 may have a vertical surface corresponding to the vertical portion 231 of the support 23 . Furthermore, the inner heat insulating material 26 may be provided to have a vertical surface corresponding to the vertical portion 231 of the support 23 and an inclined surface corresponding to the chamfer portion 146 of the secondary insulation wall 14 .

The inner heat insulating material 26 may be provided similarly to that shown in FIG. 2 , and a finished heat insulating wall 12a may be laminated on the inner side of the inner heat insulating material 26 . However, the connection barrier 24 of this embodiment is already covered by the inner heat insulating material 26, and the finished heat insulating wall 12a may be provided to cover the inner heat insulating material 26.

As such, in this embodiment, the chamfer portion 146 is placed on the secondary insulation wall 14 so that the connection barrier 24 is bent only at an acute angle to implement sealing, simplifying the structure of the support 23 while improving workability. High and stable sealing function can be guaranteed. In addition, the connection barrier 24 connects the upper end of the secondary barrier 13 and the support 23 to maintain gas tightness.

4 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.

In the dome coaming 20a of this embodiment, the support 23 has a vertical portion 231 and a bent portion 233. As in the previous embodiment, the vertical portion 231 is located outside the secondary barrier 13 and is provided in parallel with the outer wall 21.

However, this embodiment includes a bent portion 233 instead of the inclined portion 232 of FIG. 2 , and the bent portion 233 is provided to be bent inward from the lower portion of the support 23 . The bent portion 233 is bent inward from the lower end of the vertical portion 231, and the support 23 including the vertical portion 231 and the bent portion 233 may form a shape such as a letter L.

The bent portion 233 may be bent at least at a right angle from the vertical portion 231 when compared to the case where the vertical portion 231 is further extended. For example, the bent portion 233 is provided to be bent at 90 degrees from the vertical portion 231 and extends inward. At this time, the length of the bent portion 233 in an inward and outward direction may be provided to such an extent that the inner end is located inside the secondary barrier 13 .

The lower end of the bent portion 233 horizontal to the upper wall 22 and the secondary insulating wall 14 may be spaced apart in the vertical direction, and the spaced gap may be filled with the outer heat insulating material 25 . In addition, at a position where the support 23 and the secondary insulation wall 14 are spaced apart, the connection barrier 24 may be bent toward the inside.

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end bent inward relative to the lower end to be fixed to the bent portion 233 . At this time, the upper end of the connection barrier 24 may be fixed to the lower surface of the bent portion 233 .

That is, the support 23 is provided in an L-shape, and the connection barrier 24 is provided in an L-shape. Therefore, after bonding the lower end of the connection barrier 24 to the secondary barrier 13, the operator bends the connection barrier 24 so that the upper end of the connection barrier 24 overlaps the lower surface of the bent portion 233. , The top of the connection barrier 24 and the bottom of the bent portion 233 may be bonded.

The lower end of the connection barrier 24 is located above the primary insulation wall 12, and the connection barrier 24 can be constructed on the secondary barrier 13 not covered by the primary insulation wall 12, A finishing insulation wall 12a may be provided between the secondary insulation wall 14 and the lower surface of the bent portion 233 to cover the connection barrier 24 .

The outer heat insulating material 25 may have a shape in which a portion is filled between the outer wall 21 and the support 23 and protrudes inward between the support 23 and the secondary heat insulating wall 14 . As described above, since the lower end of the bent portion 233 of the support 23 is spaced upward from the secondary insulation wall 14, the outer insulation material is located in the gap between the support 23 and the secondary insulation wall 14. (25) can be filled.

However, the inner surface of the outer insulator 25 filling the gap between the support 23 and the secondary insulation wall 14 may be parallel to the secondary barrier 13 or the secondary insulation wall 14, and It may not protrude inward compared to the car barrier 13 .

Alternatively, a portion of the outer insulator 25 filled in the gap protrudes inward from the secondary barrier 13 and may be provided to have a shape for guiding the curved portion of the secondary barrier 13 .

The inner insulator 26 may be fixed to the vertical portion 231 of the support 23 and may fill a space between the vertical portion 231 and the bent portion 233 . However, in this embodiment, since the inner end of the bent part 233 extends inwardly than the secondary barrier 13, the finish insulation wall 12a may be installed below the bent part 233, and at least two The inner insulator 26 divided as described above may be provided to fill the space between the bent portion 233 and the upper wall 22 and the space between the inner end of the bent portion 233 and the first barrier, respectively.

As such, in this embodiment, the secondary barrier 13 and the support 23 are connected to divide the insulation space inside and outside the secondary barrier 13, but the connection barrier 24 is bent inward and attached to the lower surface of the support 23. Sealing stability (airtightness) of the connection barrier 24 can be ensured by applying a structure that is.

5 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.

Referring to FIG. 5 , in the liquefied gas storage tank 1 according to the fourth embodiment of the present invention, a support 23 may be provided to have a vertical portion 231 and a protruding portion 234 .

The vertical portion 231 is located outside the secondary barrier 13 and is provided parallel to the outer wall 21 . The vertical portion 231 of this embodiment is provided in a form in which the lower end protrudes when compared to the case where the inclined portion 232 or the bent portion 233 is provided. This is because the protrusion 234 is provided not at the bottom of the vertical portion 231 but at a point (a certain height upward from the bottom), and a block material 2341 is provided on the inside of the lower end of the vertical portion 231 and below the protrusion 234. ) may be provided.

The protruding portion 234 is provided to protrude inward from one point of the vertical portion 231 . The protruding portion 234 and the vertical portion 231 may have a ? or T shape, but the protruding angle of the protruding portion 234 may be a right angle or an acute angle with respect to the vertical portion 231 .

The inner end of the protrusion 234 may be disposed outside the secondary barrier 13, and the upper end of the connection barrier 24 may be fixed to the upper surface of the protrusion 234 by bonding or the like. At this time, the connection barrier 24 is provided to cover the block material 2341 between the lower end fixed to the secondary barrier 13 and the upper end fixed to the protrusion 234 .

A block material 2341 is seated in the space between the inner side of the vertical portion 231 and the lower side of the vertical portion 231 . The block material 2341 may be made of the same material as the inner heat insulating material 26 and may be connected to the vertical portion 231 or the like through bonding.

The block material 2341 may have a structure that engages with the secondary insulating wall 14 . To this end, the secondary insulation wall 14 may have a stepped portion 144 provided at an upper end adjacent to the support 23, and the block material 2341 has a size extending downward from the vertical portion 231 so that the lower end is It may be seated on the stepped portion 144 .

An inner surface of the block material 2341 in contact with the connection barrier 24 may be provided parallel to the secondary barrier 13 . Therefore, when the connection barrier 24 is in contact with the inner surface of the block material 2341 and seals between the secondary barrier 13 and the support 23, the connection barrier between the secondary barrier 13 and the block material 2341 ( 24) may not be bent or bent unnecessarily.

The connection barrier 24 has a lower end fixed to the secondary barrier 13, a central portion in contact with the inner surface of the block material 2341, and an upper end bent outward relative to the lower end and fixed to the protrusion 234. As described above, the inner surface of the block material 2341 and the secondary barrier 13 are parallel, but since the inner end of the protrusion 234 is biased toward the outside, the connection barrier 24 is It is provided flat between the secondary barrier 13 and the block material 2341, and is bent between the block material 2341 and the protrusion 234.

At this time, the block material 2341 may form a curved surface or an inclined surface at a portion where the connection barrier 24 comes into contact with in order to relieve stress concentration on the bent portion of the connection barrier 24 . For example, the block material 2341 may have an inclined surface or a curved surface in the form of eliminating internal and external deviation between the secondary barrier 13 and the inner end of the protruding portion 234 .

The outside of the curved portion of the connection barrier 24 between the block material 2341 and the protrusion 234 may be an empty space, but to support the connection barrier 24, a heat insulating material such as glass wool or polyurethane foam It is also possible to fill

The connection barrier 24 may be bent at a right angle toward the outside between the block material 2341 and the protrusion 234, and the upper end may be fixed by bonding or welding while overlapping the upper surface of the protrusion 234.

An inner heat insulating material 26 of an appropriate shape/material may be installed between the upper end of the connection barrier 24 and the upper wall 22, and the inner surface of the connection barrier 24 is covered with a finishing insulation wall 12a, A primary barrier 11 may be installed on the inner surface of the finished insulation wall 12a.

In this way, the present embodiment has a horizontal protrusion 234 on the support 23 and seals between the protrusion 234 and the secondary barrier 13 with the connection barrier 24, but a block material 2341 is placed The car barrier 13 can be supported. Also, since the connection barrier 24 overlaps the upper surfaces of the support 23, the block material 2341, and the secondary barrier 13, gas tightness can be maintained.

In addition, in this embodiment, instead of the connection barrier 24 directly sealing between the secondary insulation wall 14 and the support 23, a block material 2341 having a lower coefficient of thermal expansion than the secondary insulation wall 14 is added. By doing so, the thermal stress applied to the connection barrier 24 can be reduced and damage caused by the thermal stress can be effectively prevented.

6 is a partial cross-sectional view of a liquefied gas storage tank according to a fifth embodiment of the present invention.

Referring to FIG. 6, in the liquefied gas storage tank 1 according to the fifth embodiment of the present invention, the upper end of the connection barrier 24 is fixed to the upper wall 22 rather than the support 23, so that the secondary barrier ( 13) and the dome 20 can be sealed.

Specifically, in this embodiment, the connection barrier 24 may have a lower end fixed to the secondary barrier 13 and an upper end bent inwardly compared to the lower end to be fixed to the inner end of the upper wall 22 .

A first level difference eliminator 221 may be provided at the inner end of the upper wall 22, and a primary barrier 11 may be fixed to the inner surface of the primary level difference eliminator 221. The upper end may be fixed to the lower surface of the first level difference eliminating unit 221 provided on the upper wall 22 .

In this embodiment, the support 23 may have an L-shape by including a vertical portion 231 and a bent portion 233, and the inner end of the bent portion 233 is the secondary barrier 13, unlike in FIG. It can be placed more outside. In this case, the insulation space inside and outside the secondary barrier 13 is not partitioned by the support 23, and the support 23 may be disposed in the insulation space outside the secondary barrier 13.

At this time, in this embodiment, the bent portion 233 and the secondary insulation wall 14 are vertically spaced apart, and the outer insulation 25, at least a part of which is fixed between the support 23 and the outer wall 21, supports ( 23) and the secondary insulation wall 14 may have a form protruding inward. However, the inner surface of the outer insulating material 25 filled between the support 23 and the secondary insulating wall 14 may be parallel to the secondary barrier 13.

In this embodiment, an inner heat insulating material 26 may be used to support the connection barrier 24 between the secondary barrier 13 and the primary step difference eliminator 221 . The inner heat insulator 26 is disposed inside the vertical portion 231 and fixed through the vertical portion 231/bent portion 233, and the inner surface may be located inside the bent portion 233.

The inner heat insulator 26 may be formed in an L-shape having an inner surface parallel to the secondary barrier 13 and a lower surface parallel to the lower surface of the primary step eliminator 221 . Of course, the part having the inner surface parallel to the second barrier 13 and the part having the lower surface parallel to the lower surface of the first step eliminating means 221 are made of the same/different materials and provided separately, and then the upper wall of the dome coaming 20a. It can be installed in (22) to achieve unity.

The L-shaped inner insulator 26 supports the vertical portion of the connection barrier 24 extending upward from the secondary barrier 13, and is fixed to the primary level difference relieving means 221. Connection barrier 24 ) can touch the horizontal part of At this time, the connection barrier 24 is provided to be bent at the stepped portion of the inner insulator 26, and the stepped portion of the inner insulator 26 has a shape such as a right angle or a curved surface.

A finishing insulating wall 12a may be provided on the inner surface of the connecting barrier 24 for the construction of the primary barrier 11, and the finishing insulating wall 12a is connected to the portion facing the bent portion in the connecting barrier 24. It may be processed in the form of a curved surface or an inclined surface to correspond to the shape of the barrier 24.

In this way, the present embodiment utilizes the inner end structure of the upper wall 22 rather than the support 23 to close the inner and outer insulation space of the secondary barrier 13, thereby changing the shape of the support 23 from the viewpoint of structural strength. You can design more freely. In addition, in this embodiment, the connection barrier 24 is connected at one side of the first step difference eliminating means 221, the inner insulation 26, the outer insulation 25, and the secondary barrier 13, so gas tightness can be maintained. .

7 is a partial cross-sectional view of a liquefied gas storage tank according to a sixth embodiment of the present invention.

Referring to FIG. 7 , in the liquefied gas storage tank 1 according to the sixth embodiment of the present invention, the support 23 may extend horizontally from the outer wall 21 toward the inside.

However, the support 23 of this embodiment may not have the vertical portion 231, and the upper end of the connection barrier 24 may be fixed to the upper surface of the horizontal portion 235 of the support 23 while being bent outward compared to the lower end. there is.

Specifically, the support 23 has a horizontal portion 235 extending inwardly from the outer wall 21 , and the horizontal portion 235 may be spaced apart from the secondary insulation wall 14 in an upward direction. At this time, a block material 2341 is provided between the horizontal portion 235 and the secondary insulation wall 14 .

At least a portion of the block material 2341 may be provided between the horizontal portion 235 and the secondary insulation wall 14 to surround the inner end of the horizontal portion 235 . In particular, the inner surface of the portion surrounding the inner end of the horizontal portion 235 in the block material 2341 is provided in a curved shape, so that the bending of the connection barrier 24 can be guided.

That is, in this embodiment, when the connection barrier 24 is deformed to be bent between the secondary barrier 13 and the support 23, the block material 2341 guides the deformed portion of the connection barrier 24 to connect The structural strength of the barrier 24 can be supplemented.

In addition, the block material 2341 may close the inner end of the horizontal portion 235 with a curved surface or an inclined surface to prevent the connection barrier 24 from being damaged by the inner end of the horizontal portion 235 . At least a portion of the block material 2341 may be disposed between the horizontal portion 235 and the secondary insulation wall 14 and may have a L-shape having a stepped portion corresponding to the thickness of the horizontal portion 235 . In addition, the upper end of the block material 2341 is provided at a height lower than the upper surface of the horizontal part 235, so that the connection barrier 24 bent by the curved surface of the block material 2341 is smoothly fixed to the horizontal part 235. Meanwhile, although the block material 2341 is shown as a curved surface in FIG. 7 , the inner end of the horizontal portion 235 may not be made of the block material 2341 but may be made of an empty space.

Between the horizontal portion 235 of the support 23 and the upper wall 22, an external heat insulating material 25 may be installed. In addition, an inner heat insulator 26 is installed between the outer heat insulator 25 and the primary level difference eliminating means 221 . Thereafter, the finish insulation wall 12a is laminated to cover the outer insulation 25, the connection barrier 24, etc., and the primary barrier 11 is formed on the inner surface of the finish insulation wall 12a and the primary insulation wall 12. can be installed

As such, in this embodiment, the support 23 is provided as the horizontal portion 235, and the inner end of the horizontal portion 235 is wrapped around the curved surface using the block material 2341, so that the support 23 and the secondary It is possible to support a curved portion of the connection barrier 24 that is bent in an L-shape between the barriers 13.

In addition, in this embodiment, the connection barrier 24 connects the support 23, the block material 2341, and the upper end of the secondary barrier 13 in such a way that it is connected, so that gas tightness can be maintained. In addition, the present embodiment not only shortens the working period by simply improving the complex barrier finishing structure, but also maximizes the sealing effect by sufficiently securing the bonding area of the connection barrier 24.

8 is a partial cross-sectional view of a liquefied gas storage tank according to a seventh embodiment of the present invention.

Referring to FIG. 8 , in the liquefied gas storage tank 1 according to the seventh embodiment of the present invention, the connection barrier 24 may be fixed to the upper wall 22. In particular, in this embodiment, the support 23 previously described in other embodiments can be omitted.

Specifically, in the connection barrier 24 of this embodiment, in order to seal between the secondary barrier 13 and the dome 20, the lower end is fixed to the secondary barrier 13 and the upper end is bent inward relative to the lower end so that the upper wall 22 ) can be fixed to the lower surface of

The upper wall 22 may be provided with a first step eliminating means 221 at an inner end, and the connection barrier 24 has an upper end fixed to the lower surface of the upper wall 22 from the outside of the first step eliminating means 221. . That is, compared to FIG. 6 where the upper end of the connection barrier 24 is fixed to the lower surface of the primary step difference eliminator 221, in this embodiment, the connection barrier 24 is connected to the upper wall 22 regardless of the primary step difference eliminator 221. ) can be fixed.

At this time, an outer insulation material 25 may be provided between the upper wall 22 and the secondary insulation wall 14, and the outer insulation material 25 is provided with an inner surface parallel to the secondary barrier 13 to form a connection barrier 24. can support The connection barrier 24 may be bent inwardly at an upper position of the outer insulating material 25 while being supported by the inner surface of the outer insulating material 25 and fixed to the lower surface of the upper wall 22 .

In this embodiment, as the connection barrier 24 is directly connected to the lower surface of the upper wall 22, the connection barrier 24 may be provided such that the upper end is placed above the lower surface of the primary step difference eliminator 221.

At this time, an inner insulator 26 having an appropriate shape and material may be installed between the connection barrier 24 and the primary step difference eliminator 221 in the inward and outward direction, and the lower side of the inner insulator 26 and the connection barrier 24 A finishing insulating wall 12a may be constructed on the inner surface of the connection barrier 24 to be covered.

As such, in this embodiment, the upper end of the connection barrier 24 fixed to the secondary barrier 13 is directly fixed to the lower surface of the upper wall 22, so that there is a gap between the connection barrier 24 and the outer wall 21 in the inward and outward direction. The structure can be greatly simplified by omitting a separate support 23 on the lower surface of the upper wall 22.

In addition, in this embodiment, since the connection barrier 24 is installed by connecting the upper wall 22, the outer insulation 25, and the secondary barrier 13, it is easy to maintain gas tightness, shorten the working period through structural simplification, It is possible to obtain effects such as increased insulation efficiency through sufficient installation of insulation materials.

9 is a partial cross-sectional view of a liquefied gas storage tank according to an eighth embodiment of the present invention, and FIG. 10 is a partially exploded perspective view of a liquefied gas storage tank according to an eighth embodiment of the present invention. 8 It is a partial perspective view of the liquefied gas storage tank according to the embodiment. 12 is an exploded perspective view of a corner barrier of a liquefied gas storage tank according to an eighth embodiment of the present invention.

First, referring to FIGS. 9 and 10, in the liquefied gas storage tank 1 according to the eighth embodiment of the present invention, the support 23 may include a vertical portion 231 and a bent portion 233, A secondary step difference eliminating unit 236 may be provided in the bent portion 233 .

The lower end of the support 23 is spaced upward from the secondary insulation wall 14, and a gap may be formed between the bent portion 233 and the secondary insulation wall 14. At this time, at least a part of the secondary step difference eliminating unit 236 may be positioned in the gap.

The second step solving means 236 may have a U-shape similar to the first step solving means, and a fixing end 237 is provided at the bent part 233 to fix the second step solving means 236 It can be, and the lower surface of the secondary step difference eliminating means 236 can be fixed to the bent part 233 by the fixing end 237.

In addition, the upper surface of the second step eliminating means 236 may be overlapped and fixed to the upper surface of the bent portion 233, and the inner surface of the second step eliminating means 236 may be provided in parallel with the second barrier 13 . That is, the secondary step difference eliminating unit 236 compensates for the discrepancy between the inner end of the bent portion 233 and the secondary barrier 13 in the inward and outward direction, thereby ensuring sealing performance by the connection barrier 24 . However, as will be described below, the inner surface of the secondary step difference eliminating unit 236 may be out of alignment with the secondary barrier 13.

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the secondary step difference eliminator 236 to seal between the secondary barrier 13 and the support 23 . In particular, the upper portion of the connection barrier 24 is bent outwardly while surrounding the second level difference eliminating means 236 and is fixed to the upper surface of the second level difference eliminating means 236 .

In this case, the connection barrier 24 may be provided so as to come into contact with the inner surface of the secondary step difference solving means 236 but not be bonded to the inner surface of the second step difference eliminating means 236 . That is, the lower end of the connection barrier 24 is stacked and connected by abutting in a direction perpendicular to the secondary barrier 13, and the upper part is not bonded while abutting in a direction perpendicular to the inner surface of the secondary step difference eliminator 236. And, the upper side may be bonded and fixed while abutting in a horizontal direction to the upper surface of the secondary step difference eliminating means 236.

That is, the connection barrier 24 is bent or bent to correspond to the shape of the second step difference solving means 236 between the inner surface of the second step difference solving means 236 and the upper surface of the second step difference solving means 236. It can be done.

Therefore, the fixing direction of the lower end and the upper end of the connection barrier 24 may be different from each other, and in this case, the connection barrier 24 has a lower surface fixed to the secondary barrier 13 and a An upper surface fixed to the upper surface may be provided to form a right angle.

Like the secondary barrier 13, the connection barrier 24 is made of a composite sheet in which a non-metallic material such as a glass fiber sheet is mixed.

Of course, the connection barrier 24 can also be made of a metal material having a higher strength than the secondary barrier 13, and in this case, the connection barrier 24 has the shape of the secondary step elimination means 236 (particularly, the secondary step elimination means). (236) can be manufactured to have a shape corresponding to the curvature between the inner surface and the upper surface).

The inner surface of the secondary step difference eliminating means 236 is provided to support the connection barrier 24 while coming into contact with the connection barrier 24 . At this time, since the connection barrier 24 is made so as not to be bonded to the inner surface of the second step canceling means 236, the connection barrier 24 on the inner surface of the second step canceling means 236 and Can be contracted/expanded independently.

In addition, since the connection barrier 24 of this embodiment is fixed to the upper surface of the second step eliminating means 236, not the inner surface, the inner surface of the second step eliminating means 236 necessarily needs to be parallel to the second barrier 13. There is no

That is, the secondary step eliminating means 236 is for securing sealing performance by more smoothly fixing the connection barrier 24 compared to the bent portion 233, the inner surface of the second step eliminating means 236 is It may be provided relatively parallel to the primary barrier 13 or deflected inward or outward relative to the secondary barrier 13 to the extent that it does not significantly affect sealing.

At this time, the degree of significant influence on the sealing means that as the connection barrier 24 is bent or bent due to the step difference between the secondary barrier 13 and the inner surface of the secondary step difference eliminator 236, it has a significant effect on the structural strength. may mean a case of

The connection barrier 24 is made of a material capable of bending, even if the inner surface of the secondary step eliminating means 236 is slightly biased in the inward and outward direction compared to the secondary barrier 13, so that the secondary barrier 13 and the second step After being finely deflected inward or outward between the solving means 236, it may come into contact with the inner surface of the second step canceling means 236 and be fixed to the upper surface of the second step canceling means 236.

Hereinafter, the corner step difference eliminating means 28 and the connection barrier 24 at the corner of the dome 20 will be described based on FIGS. 11 and 12 .

11 and 12, the support 23 may have an inner surface facing the storage space and an upper surface that is bent from the inner surface and extends outward. The connection barrier 24 provided at the corner of the dome 20 is , The corner barrier 27 may include a main corner barrier 271, a corner auxiliary barrier 272, and a corner finishing barrier 273.

Specifically, at the corner of the dome 20, a corner step difference eliminator 28 is provided on the support 23. It extends to and may have upper and lower surfaces having a relatively b-shape. That is, at least three barrier sheets are provided in the corner step difference eliminating means 28 of the support 23 disposed at the corner, and at least two barrier sheets may be overlapped with each other.

At this time, the corner barrier 27 may be finished by stacking the corner main barrier 271 and the corner auxiliary barrier 272 on the corner step eliminating means 28 so as not to overlap each other, and then stacking the corner finishing barrier 273. .

Specifically, the corner main barrier 271 covers the inner surface of the support 23 (in the description of the corner barrier 27 in this specification, the support 23 can be interpreted as a corner step eliminating means 28). A catalog is prepared. In addition, the corner main barrier 271 may be bent or bent to have an L-shaped cross section, similar to the connection barrier 24 described above, to cover a portion of the upper surface of the support 23 . In particular, the corner main barrier 271 is provided to cover the peripheral portion other than the corner of the upper surface of the support 23.

The corner auxiliary barrier 272 may be provided to cover the upper surface of the support 23 . While the corner main barrier 271 covers the inner surface of the support 23 and a portion of the upper surface of the support 23 (peripheral portion other than the corner) in the corner region of the dome 20, the corner auxiliary barrier 272 covers the dome 20 ), it is possible to cover the rest of the upper surface (edge portion) of the support 23 in the corner region. That is, the corner main barrier 271 and the corner auxiliary barrier 272 are arranged to face each other on the surface of the support 23 (they may not overlap each other) so as to cover the inner surface and the upper surface of the support 23 at the corner of the dome 20. can cover

In this embodiment, in addition to the corner main barrier 271, the corner auxiliary barrier 272 is provided as a separate configuration, which is to prevent the formation of a three-dimensional curved shape in the corner main barrier 271.

That is, as shown in the drawing, the corner main barrier wall 271 does not extend upward from the corner of the dome 20 to the inner surface of the support 23, and supports at the peripheral portions of both sides other than the corner of the dome 20. Only the portion in contact with the inner surface of (23) extends upward and has a shape bent outward, so that a two-dimensional curved surface shape can be formed. That is, the corner main barrier 271 may be provided to cover a peripheral portion other than a corner of a bent portion between the inner surface and the upper surface of the support 23 . For reference, the corner portion of the bent portion between the inner surface and the upper surface of the support 23 means a bent portion between the convex portion outward from the inner surface of the support 23 and the upper surface of the support 23 .

Therefore, the corner main barrier 271 is formed in a form having only a flat and two-dimensional curved surface, so that primary sealing can be stably implemented between the support 23 and the secondary barrier 13, and the convenience of manufacturing and construction is greatly improved. can make it As described above in the connection barrier 24, the corner main barrier 271 has a lower end fixed to the secondary barrier 13 and an upper portion wrapped around the inner surface of the support 23 and bent outward to the upper surface of the support 23. can be fixed on

In particular, as the corner main barrier 271 has a shape that does not cover the corner of the upper surface of the support 23, the upper portion of the corner main barrier 271 may be configured as a pair as shown in the drawing, and the upper portion of the pair May be bent outward away from each other based on the corner portion and fixed to the upper surface of the support 23, respectively.

On the other hand, the corner auxiliary barrier 272 is provided to cover the corner portion of the upper surface of the support 23 and also to cover the corner portion of the bent portion between the inner surface and the upper surface of the support 23. That is, the corner auxiliary barrier 272 may be formed in a three-dimensional curved shape to cover a corner portion at a bent portion of the support 23 . However, since primary sealing is implemented by the corner main barrier 271 without a three-dimensional curved surface, efficient sealing can be implemented even if a three-dimensional curved surface is applied to the corner secondary barrier 272.

The corner finishing barrier 273 may overlap the corner main barrier 271 and the corner auxiliary barrier 272 to form a seal. The corner finishing barrier 273 may be provided to cover both the corner portion and the peripheral portion of the bent portion between the inner surface and the upper surface of the support 23 .

The corner closing barrier 273 may have a composite form of a two-dimensional curved surface and a three-dimensional curved surface, and may cover and seal between the corner main barrier 271 and the corner auxiliary barrier 272 disposed to face each other.

Since the corner of the dome 20 will be mainly sealed between the support 23 and the secondary barrier 13 by the corner main barrier 271, the corner finishing barrier 273 includes a three-dimensional curved surface that is somewhat difficult to manufacture, Even if there is, sealing of liquefied gas can be sufficiently implemented.

That is, the corner main barrier 271 made of only flat and two-dimensional curved surfaces seals between the support 23 and the secondary barrier 13, and the corner auxiliary barrier 272 made of flat and three-dimensional curved surfaces is the corner main barrier 271 ) and adhered to the support 23. Afterwards, the corner finishing barrier 273 in which the flat surface, the two-dimensional curved surface, and the three-dimensional curved surface are combined covers the corner main barrier wall 271 and the corner auxiliary barrier wall 272, thereby providing support 23 and 2 at the corners of the dome 20. The space between the car barriers 13 can be completely sealed.

In this way, the present embodiment provides a secondary step difference eliminating means 236 to more smoothly seal the connection barrier 24, but the connection barrier 24 is formed in an L-shape to provide It is in contact with the inner surface without adhesion and fixed to the upper surface of the secondary step eliminating means 236, so that the alignment between the second step eliminating means 236 and the second barrier 13 is not strictly required to increase manufacturing efficiency. can

In addition, in the present embodiment, the corner main barrier 271, the corner auxiliary barrier 272, and the corner finishing barrier 273 are stacked on the corner step eliminating means 28 to ensure sealing performance at the corner. there is.

13 is a perspective view of a corner step eliminator of a liquefied gas storage tank according to a ninth embodiment of the present invention, and FIG. 14 is an exploded perspective view of a corner barrier of a liquefied gas storage tank according to a ninth embodiment of the present invention.

13 and 14, in the liquefied gas storage tank 1 according to the ninth embodiment of the present invention, as the shape of the support 23 changes at the corner of the dome 20, the corner barrier 27 This may be different from the previous eighth embodiment.

The support 23 is provided so that the corner portion of the bent portion between the inner surface and the upper surface protrudes inward to form the protruding portion 281 . At this time, the corner portion of the bent portion may refer to a bent portion between the upper surface of the support 23 and the convex portion outward from the inner surface of the support 23 as mentioned in the previous embodiment.

That is, in this embodiment, the three-dimensional curved portion included in the corner auxiliary barrier 272 in the previous embodiment may be replaced by the support 23. At this time, the protruding portion 281 protruding from the support 23 may have a thickness considering the height at which the auxiliary corner barrier 272 is stacked (including the height of the adhesive layer for fixing the auxiliary corner barrier 272).

At this time, the corner main barrier wall 271, as in the previous embodiment, is provided to cover the peripheral portion other than the corner of the bent portion between the inner surface and the upper surface of the support 23, and has a shape consisting of a flat and two-dimensional curved surface.

On the other hand, the corner auxiliary barrier 272, unlike the previous embodiment, is provided so as not to cover the bent portion between the inner surface and the upper surface of the support 23, and may have a flat shape covering only the upper surface of the support 23.

Through this, the present embodiment prevents the formation of three-dimensional curved surfaces for the corner main barrier 271 and the corner auxiliary barrier 272 that are directly attached to the support 23, except for the corner finishing barrier 273, thereby improving the sealing performance It is possible to further increase and improve the ease of manufacture / construction, durability, etc. of the corner barrier 27.

In this way, in this embodiment, by applying the protrusion 281 to the bent portion in the corner step difference eliminating means 28, the corner auxiliary barrier 272 is composed of only a plane, thereby manufacturing the corner auxiliary barrier 272 and the like Construction can be made very convenient, and sealing reliability can be maximized during lamination.

15 is a partial cross-sectional view of a liquefied gas storage tank according to a tenth embodiment of the present invention.

Referring to FIG. 15, in the liquefied gas storage tank 1 according to the tenth embodiment of the present invention, wrinkles 24b may be formed on the connection barrier 24 compared to the eighth embodiment described above with reference to FIG. 6 .

The connection barrier 24 of this embodiment is made of a mixed material of metal and non-metal, etc., and the connection barrier 24 made of such a composite material may include a flat portion 24a and a wrinkle portion 24b.

The flat part 24a is a part such as the lower end laminated on the secondary barrier 13 and the upper end laminated on the support 23 (particularly the secondary step difference eliminator 236), and the secondary barrier 13 is formed by adhesion or the like. In order to be fixed to the support 23 or to cover the secondary step eliminator 236, the secondary barrier 13 and the inner surface of the secondary step eliminator 236 may be provided in parallel with each other.

The wrinkled portion 24b is provided in at least a part between the flat portions 24a. The wrinkled portion 24b may have a shape that protrudes or sinks in an inward and outward direction between the secondary barrier 13 and the support 23 . That is, the wrinkle portion 24b may be a portion formed by bending or bending the connection barrier 24 made of a composite material, and the thickness of the wrinkle portion 24b may be the same as that of the flat portion 24a.

That is, the wrinkles 24b may be curved similarly to the wrinkle structure in the primary barrier 11, and when the wrinkles 24b are processed flat, the distance between the flat portions 24a (secondary barrier 13) and the gap between the second step difference eliminating means 236).

Of course, the corrugated portion 24b may have a concave-convex structure in which the thickness is partially thinned or thickened, and the above-described bent or bent shape and the concave-convex structure in which the thickness is changed may be combined.

These wrinkles 24b are for absorbing when the mutual distance between the support 23 provided on the dome 20 and the wall 10 in contact with the liquefied gas changes due to the storage of the cryogenic liquefied gas. That is, the wrinkles 24b are provided to prepare for the occurrence of contraction in which the secondary barrier 13 is shifted downward or expansion in the direction of shifting upward with respect to the support 23, and the wrinkles 24b are provided Accordingly, the connection barrier 24 of this embodiment can prepare for contraction and expansion more flexibly.

That is, the wrinkled portion 24b is configured to be finely folded or unfolded between the flat portions 24a when the flat portions 24a are fixed to the secondary barrier 13 and the support 23, respectively, and support (23) Even if the height of the upper part of the secondary barrier 13 changes, the connection barrier 24 is smoothly maintained in a sealed state.

To this end, the connection barrier 24 is provided with wrinkles 24b in a state before the liquefied gas is stored in the accommodation space or in a state before contraction due to the cryogenic liquefied gas. That is, the connection barrier 24 may have a wrinkled portion 24b even before contraction, and the wrinkled portion 24b may be relatively more wrinkled when storing liquefied gas.

Of course, the wrinkle portion 24b is provided in a structure that can be wrinkled and can form a relatively flat surface before storing the liquefied gas, and can also be deformed to form wrinkles during storage of the liquefied gas.

The entire corrugated portion 24b may have a shape protruding outward toward the hull compared to the flat portion 24a. In this case, the finish insulating wall 12a laminated inside the connection barrier 24 may have a flat outer surface facing the connection barrier 24 .

On the other hand, in the case of the outer insulator 25 filled between the secondary insulation wall 14 and the support 23, etc., its shape may be different from that of the eighth embodiment due to the application of the wrinkles 24b.

The outer insulator 25 may have a shape protruding inward between the support 23 and the secondary insulation wall 14. It is disposed outwardly from the inner surface of (236).

The inner surface of the secondary step difference eliminating means 236 and the secondary barrier 13 may be disposed on the same plane to seal the connection barrier 24. In the case of the eighth embodiment, the innermost inner surface of the outer heat insulating material 25 While it is also disposed on the same plane as the inner surface of the secondary level difference eliminating means 236, in this embodiment, the innermost inner surface of the outer heat insulating material 25 is deflected outward. Therefore, in the present embodiment, a recessed portion 25a accommodating the wrinkled portion 24b may be formed between the secondary step difference eliminating means 236 and the secondary insulating wall 14 .

In addition, in this embodiment, since the corrugated portion 24b is applied to the connection barrier 24, the lower flat portion 24a fixed to the secondary barrier 13 and the secondary step eliminating means 236 of the support 23 It is also possible that the top flat portion 24a that abuts on the inner surface of is deflected in the inward and outward direction. In this case, the inner surface of the secondary step difference eliminating means 236 and the secondary barrier 13 may not be disposed on the same plane but may be disposed in parallel, but as the connection barrier 24 has the wrinkle portion 24b, Sealing between the car barrier 13 and the support 23 can be sufficiently ensured.

In addition, the recessed portion 25a formed by disposing the inner surface of the outer heat insulating material 25 biased toward the outside may be applied to the finished insulation wall 12a according to the shape of the wrinkled portion 24b. That is, when at least a part of the wrinkled portion 24b protrudes inward toward the accommodation space compared to the flat portion 24a, the outer surface of the finished insulation wall 12a protrudes inward from the flat portion 24a among the wrinkled portions 24b. A depression (not shown) may be provided to accommodate the married couple.

In this way, in this embodiment, by applying the corrugation portion 24b to the connection barrier 24 including a non-metallic material, the height of the secondary barrier 13 relative to the support 23 can be varied during storage of liquefied gas. In this case, it is possible to stably maintain sealing force while the connection barrier 24 contracts/expands.

In addition, in this embodiment, the outer heat insulating material 25 forms the recessed portion 25a so that the wrinkled portion 24b is accommodated between the secondary step eliminating means 236 and the secondary insulating wall 14, The pleat shape of (24b) can be secured more freely.

Of course, the present invention may include a combination of at least one or more embodiments and known technologies known to those skilled in the art, or a combination of at least two or more embodiments as additional embodiments, in addition to the above-described embodiments.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It will be clear that the modification or improvement is possible.

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

1: liquefied gas storage tank 10: wall
11: primary barrier 12: primary insulation barrier
121: plywood 122: insulation block
12a: finishing insulation wall 13: secondary barrier
14: secondary insulation wall 141: plywood
142: insulation block 143: mastic
144: stepped portion 146: chamfer portion
20: dome 20a: dome coaming
21: outer wall 211: stiffener
22: upper wall 221: 1st step relieving means
222: fixed end 23: support
231: vertical part 2311: stud
232: inclined portion 233: bent portion
234: protrusion 2341: block material
235: horizontal part 236: 2nd step eliminating means
237: fixed end 24: connection barrier
24a: flat part 24b: wrinkled part
25: outer insulator 25a: depression
26: inner insulation 261: mastic
262: fixture 27: corner barrier
271: corner main barrier 272: corner auxiliary barrier
273: corner finishing barrier 28: corner step eliminating means
281 protrusion

Claims (6)

A primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary thermal insulation wall disposed outside the primary barrier, a secondary barrier provided outside the primary thermal insulation wall, and the second barrier a wall including a secondary thermal insulation wall disposed outside the primary barrier and forming a thermal insulation space between the primary barrier and the secondary barrier and outside the secondary barrier; and
A dome provided on the wall forming an upper surface of the storage space to close the heat insulation space,
the dome,
an outer wall having a certain height toward the upper side of the storage space;
an upper wall supported by the outer wall and to which the primary barrier is connected to an inner end;
a support extending downward from the upper wall inside the outer wall; and
A connection barrier sealing between the secondary barrier and the support,
The support is
A vertical portion located outside the secondary barrier and parallel to the outer wall, a bent portion bent inward from the bottom of the vertical portion, and a secondary step provided at the inner end of the bent portion and fixed to the connection barrier. have the means,
The second step eliminating means is formed in a U-shape having a vertical inner surface and horizontal upper and lower surfaces,
The connection barrier is
The lower end is fixed to the secondary barrier and the upper part is bent outward while wrapping the secondary step canceling means between the vertical inner surface and the horizontal upper surface of the second step canceling means, and is fixed to the upper surface of the second step canceling means. , The bent part is guided by abutting by the second step elimination means,
The second step eliminating means,
The vertical inner surface and the horizontal upper surface have a certain curvature and are connected to each other by an inwardly convex curved surface, and a curved portion of the connection barrier has a curvature corresponding to the curved surface of the secondary step difference eliminator. Guide the curved part in the connection barrier through the curved surface of,
The connection barrier is
The vertical bottom surface is directly fixed to the secondary barrier, and the horizontal top surface forming a right angle to the bottom surface is directly fixed to the upper surface of the secondary step eliminating means,
The vertical inner surface of the secondary step eliminating means is provided in parallel with the secondary barrier in the inward and outward direction,
The vertical portion of the connection barrier is in direct contact with the vertical inner surface of the second step relieving means without separate stacking or bonding, and is supported inward and outward by the vertical inner surface of the second step relieving means. liquefied gas storage tank. According to claim 1,
The bent part is provided with a fixing end for fixing the second step eliminating means,
The liquefied gas storage tank of claim 1, wherein the upper surface of the secondary step eliminating means is fixed to the bent portion and the lower surface is fixed to the fixed end. delete delete delete A vessel having the liquefied gas storage tank according to claim 1 or 2.

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