Liquefied gas storage tank

Abstract

A liquefied gas storage tank according to the present invention comprises: a corner block having a lower block and an upper block; the upper block includes: a barrier fixing member configured to bend and fix the angular primary barrier at a predetermined angle inside the first surface and the second surface, and configured outside the angular primary barrier; an inner primary splint disposed on the outer side of the bulkhead fixing member; a corner primary heat insulation member disposed on the outer side of the inner primary cleat; an outer primary cleat disposed on the outer side of the corner primary insulator and coupled to the lower block; an outer primary cleat having a first hole is coupled to an outer side surface of a corner primary insulation member having a second hole, and an inner primary cleat having a third hole is coupled to an inner side surface of the corner primary insulation member. A bulkhead fixing member is fixed to the upper surface of the inner primary splint, and in a state where the bulkhead fixing member is fixed to the inner primary splint, a molded plug is inserted into each of communication holes formed by the first hole and the second hole.

Description

[0001] This application is a divisional application of the patent application with application number 202180039360.0, application date July 23, 2021, and invention name “Liquefied gas storage tank and ship including a liquefied gas storage tank”. Technical Field

[0002] The present invention relates to a liquefied gas storage tank. Background Art

[0003] Recently, due to technological development and environmental regulations, liquefied gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) are increasingly used instead of gasoline or diesel.

[0004] In addition, LNG tankers, LNG RVs (Regasification Vessels), LNG FPSOs (Floating, Production, Storage and Offloading), LNG FSRUs (Floating Storage and Regasification Units) and other ships that transport or store liquefied gases such as LNG at sea are equipped with storage tanks (called "cargo tanks") that store LNG in an extremely low-temperature liquid state. According to IMO environmental regulations, ultra-large container ships and various cargo ships are also suitable for LNG fuel tanks.

[0005] Furthermore, liquefied gas storage tanks generate boil-off gas (BOG) due to external heat intrusion. The core of liquefied gas storage tank design is to reduce the natural vaporization rate (BOR) of the BOG through thermal insulation. Furthermore, liquefied gas storage tanks are exposed to various loads such as sloshing, necessitating the mechanical strength of the insulation panels.

[0006] With this in mind, active research is underway to ensure the mechanical strength of the insulation panels even at right angles or obtuse angles in liquefied gas storage tanks, and to improve insulation performance to reduce stress caused by various loads such as swaying, hull deformation, and temperature changes. Summary of the Invention

[0007] Problem to be solved

[0008] The present invention is proposed to solve the problems of the above-mentioned prior art. The purpose of the present invention is to provide a liquefied gas storage tank and a ship including a liquefied gas storage tank. By improving the structure of the corner block, the low temperature burden, shaking burden and stress burden of the corner secondary barrier can be reduced.

[0009] Technical solutions to the problem

[0010] A liquefied gas storage tank according to one embodiment of the present invention comprises: a plane block arranged in a flat portion of a first surface or a second surface having different angles from each other and forming a storage space for accommodating liquefied gas, the plane block comprising a flat primary insulation wall, a flat secondary barrier wall, and a flat secondary insulation wall, the flat primary insulation wall being fixed to the flat primary barrier wall made of a metal material and arranged on the outside of the flat primary barrier wall, the flat secondary barrier wall being arranged on the outside of the flat primary insulation wall, and the flat secondary insulation wall being arranged on the outside of the flat secondary barrier wall; and corner blocks arranged on the first surface and the second surface The corner part where they meet, the corner block includes a corner primary insulation wall, a corner secondary defense wall and a corner secondary insulation wall, the corner primary insulation wall fixes the corner primary defense wall made of metal material and is arranged on the outside of the corner primary defense wall, the corner secondary defense wall is set on the outside of the corner primary insulation wall, the corner secondary insulation wall is arranged on the outside of the corner secondary defense wall, the corner primary insulation wall includes: an outer primary plywood, fixed on the corner secondary defense wall; an inner primary plywood, fixing the corner primary defense wall; and a corner primary insulation member, arranged between the inner primary plywood and the outer primary plywood.

[0011] Specifically, the corner primary insulation wall may include: an inner first fixing part and an inner second fixing part, which are respectively arranged on the inner side of the first surface and the second surface, and are composed of the outer primary plywood, the corner primary insulation part and the inner primary plywood; and an inner bending part, which is formed by filling the insulation part between the inner first fixing part and the inner second fixing part.

[0012] Specifically, the corner primary thermal insulation member may be a high-density polyurethane foam, and the thermal insulation member of the inner bending portion may be a low-density polyurethane foam.

[0013] Specifically, the corner primary defense wall can be configured to be fixed to the inner primary clamping plate of the inner first fixing part and the inner primary clamping plate of the inner second fixing part, and bent from the inner surface of the heat insulating member of the inner bending part.

[0014] Specifically, the corner secondary insulation wall may include: an outer first fixing part and an outer second fixing part, which are respectively fixed on the inner sides of the first surface and the second surface, and are composed of an inner secondary plywood, a corner secondary insulation part and an outer secondary plywood arranged in sequence toward the outside of the corner secondary wall. The side surfaces facing the outer first fixing part fixed on the first surface and the outer second fixing part fixed on the second surface can be configured to be inclined in the direction of dividing the corner part.

[0015] Specifically, the corner primary insulation wall of the corner block connected to the flat primary insulation wall of the planar block and the corner secondary insulation wall of the corner block connected to the flat secondary insulation wall of the planar block may have the same or similar thicknesses.

[0016] Another embodiment of the present invention relates to a liquefied gas storage tank, comprising a corner block arranged at a corner portion where a first surface and a second surface having different angles meet and forming a storage space for accommodating liquefied gas, the corner block comprising a lower block, a plurality of upper blocks, and an upper connecting block, the lower block being arranged on the inner side of the first surface and the second surface and being composed of a single plate, a plurality of the upper blocks being arranged adjacent to and bonded to the lower block, the upper connecting block being bonded to the upper surfaces of the adjacent lower blocks and connecting the lower blocks, the upper block (or the The upper connecting block) includes a metal anti-wall fixing member, an inner primary splint (or a first corner connecting splint), a corner primary heat insulating member (or a corner connecting heat insulating member) and an outer primary splint (or a second corner connecting splint), the anti-wall fixing member is configured to be bent at a predetermined angle on the inner side of the first surface and the second surface to fix the metal corner primary anti-wall and be configured on the outer side of the corner primary anti-wall, the inner primary splint (or the first corner connecting splint) is configured on the outer side of the anti-wall fixing member, the corner primary heat insulating member (or the corner connecting heat insulating member) is configured The outer side of the inner primary plywood (or the first corner connecting plywood), the outer primary plywood (or the second corner connecting plywood) is arranged on the outer side of the corner primary heat insulating member (or the corner connecting heat insulating member) and is bonded to the lower block, the outer primary plywood (or the second corner connecting plywood) having a plurality of first holes is bonded to the outer side surface of the corner primary heat insulating member (or the corner connecting heat insulating member) having a plurality of second holes, and the inner primary plywood (or the first corner connecting plywood) having a plurality of third holes is bonded to the corner primary heat insulating member. (or the inner side surface of the corner connecting insulation member), when the outer primary plywood (or the second corner connecting plywood), the corner primary insulation member (or the corner connecting insulation member) and the inner primary plywood (or the first corner connecting plywood) are bonded together, the anti-wall fixing member is fixed on the upper surface of the inner primary plywood (or the first corner connecting plywood), and when the anti-wall fixing member is fixed to the inner primary plywood (or the first corner connecting plywood), the molded plugs are respectively inserted into the connecting holes formed by the multiple first holes and the second holes.

[0017] Specifically, the wall-preventing fixing member can be bolted to the inner primary clamping plate (or the corner first connecting clamping plate).

[0018] Specifically, the filling of additional thermal insulation materials may be omitted or constructed between the corner primary thermal insulation materials of the upper blocks arranged adjacent to each other.

[0019] Specifically, the filling of an additional thermal insulation member may be omitted or constructed between the corner primary thermal insulation member of the upper block and the corner connecting thermal insulation member of the upper connecting block, which are arranged adjacent to each other.

[0020] Technical Effects

[0021] According to the liquefied gas storage tank and the ship having the liquefied gas storage tank of the present invention, by improving the structure of the corner block, it is possible to reduce the low temperature burden, sloshing burden, and stress burden of the corner secondary barrier.

[0022] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the inner first fixing part and the inner second fixing part of the wall fixing member for supporting the fixed corner primary wall in the corner block are not only composed of plywood, but are formed by a structure combined with an insulation member of polyurethane foam. Therefore, compared with the previous structure composed only of plywood, the insulation performance can be improved, the weight can be reduced, and the cost can be reduced.

[0023] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, by making the thickness of the corner primary insulation wall of the corner block connected to the flat primary insulation wall of the plane block and the corner secondary insulation wall of the corner block connected to the flat secondary insulation wall of the plane block the same or similar to each other, the thickness of the corner primary insulation wall is relatively thicker than before (it should be noted that the thickness of the corner secondary insulation wall is a thickness that can maintain a certain level of mechanical strength), which can reduce the low temperature burden and shaking burden of the corner secondary insulation wall, not only preventing damage to the corner secondary insulation wall, but also preventing brittle failure of the hull due to the reduction of the low temperature burden of the corner secondary insulation wall.

[0024] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the thickness of the corner primary insulation wall is constructed to be relatively thicker than before, thereby being able to increase the length of the portion of the corner secondary barrier that is not bonded to the corner secondary insulation wall. Due to the increase in the flexibility of the corner secondary barrier, not only can the probability of damage to the corner secondary barrier including the corner connecting barrier be further reduced, but the corner secondary barrier can also easily absorb hull deformation, and low-temperature stress is also further reduced.

[0025] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the inner first fixing portion and the inner second fixing portion, which are respectively arranged on the inner sides of the first surface and the second surface having different angles from each other, are separated from each other by a predetermined interval, and an inner intermediate fixing portion is provided between the inner first fixing portion and the inner second fixing portion. Thus, the inner intermediate fixing portion can be utilized to alleviate the bending angle of the corner primary barrier, thereby not only reducing the shaking burden in the corner primary barrier, but also increasing the mechanical strength of the corner portion.

[0026] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, a chamber is formed at the corners faced by the outer first fixing part and the outer second fixing part respectively fixed to the first surface and the second surface having different angles from each other, and the chamber is filled with low-density polyurethane foam, thereby making it possible to further increase the thermal insulation performance in the corner part by the low-density polyurethane foam.

[0027] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, steps are formed at the corners facing the outer first fixing part and the outer second fixing part respectively fixed on the first surface and the second surface having different angles from each other, and the step part is filled with glass wool, thereby improving the flexibility of the corner secondary barrier including the corner connection barrier formed on the upper part of the glass wool, thereby being able to better prevent damage to the corner secondary barrier.

[0028] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the outer first fixing part and the outer second fixing part, which are respectively fixed on the first surface and the second surface having different angles, are separated from each other by a predetermined interval, and an outer intermediate fixing part is provided between the outer first fixing part and the outer second fixing part. Thus, by utilizing the gaps formed between the outer first fixing part and the outer intermediate fixing part and between the outer second fixing part and the outer intermediate fixing part, compared with the previous gap, damage to the corner secondary barrier fixed on the outer fixing part can be prevented by alleviating the contraction or expansion stress caused by the temperature of the outer fixing part.

[0029] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, a chamber is formed at the corners facing the outer first fixing part and the outer second fixing part respectively fixed on the first surface and the second surface having different angles from each other, and a corner secondary defense wall is provided along the surface of the outer first fixing part and the outer second fixing part including the chamber part. As a result, the corner secondary defense wall protrudes and bends outward to increase the length of the part not bonded to the corner secondary insulation wall. Not only can the increased flexibility of the corner secondary defense wall further reduce the probability of damage to the corner secondary defense wall including the corner connecting defense wall, but the corner secondary defense wall can also easily absorb the deformation of the hull and further reduce the low-temperature stress.

[0030] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, a plurality of corner primary insulation walls including inner primary clamps forming steps with the corner primary insulation pieces are arranged on the corner secondary insulation wall, and the adjacent corner primary insulation pieces are arranged adjacent to each other. Therefore, not only can the installation operation of the anti-wall fixing component be easily realized through the step portion between the inner primary clamps arranged adjacent to each other, but also since the filling piece only needs to be placed on the step portion, the consumption of the filling piece can be reduced.

[0031] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, there is no need to equip the back of the anti-wall fixing member with a reinforcing member such as a reinforcement member, thereby reducing the weight of the anti-wall fixing member itself, and since welding for bonding the reinforcing member is not performed, the welding time can be reduced and the accuracy can be improved during manufacturing. Moreover, by evenly distributing the stress generated in the part bent at a right angle or an obtuse angle, compared with the general anti-wall fixing member with reinforcement members in the past, the frequency of damage in the bent part can be reduced, and repair can be minimized, thereby improving the stability of the system.

[0032] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the outer primary clamping plate and the corner second connecting clamping plate of the lower layer of each of the upper block and the upper connecting block are respectively applied with a chamber or a groove as an overflow confirmation unit, thereby reducing the weight of each of the upper block and the upper connecting block, and after the adhesive is applied to the upper block and the upper connecting block, the overflowed adhesive can be directly confirmed with the naked eye, thereby improving the stability of the system.

[0033] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, by being equipped with filling pieces inserted into the first step space generated between the inner primary clamps of the adjacent upper blocks and the second step space generated between the inner primary clamps of the upper blocks and the corner first connecting clamps of the upper connecting blocks, not only the gap intervals between the adjacent upper blocks and the gap intervals between the upper blocks and the upper connecting blocks can be maintained constant, but also the inner bent portions of the upper blocks and the corner connecting bent portions of the upper connecting blocks can be fixed, thereby facilitating operation when working on the upper blocks.

[0034] In addition, according to the liquefied gas storage tank of the present invention and the ship having the liquefied gas storage tank, the anti-bonding member is arranged on the exposed surfaces of the corner connection bending portion and the corner connection thermal insulation member as the non-bonding area in the upper connection block, or on the exposed surface of the corner connection wall of the lower block in contact with the corner connection bending portion as the non-bonding area of ​​the upper connection block and the inner bending portion of the upper block adjacent to the corner connection thermal insulation member as the non-bonding area of ​​the upper connection block and the exposed surfaces of the corner primary thermal insulation member, thereby preventing the adhesive from overflowing to the exposed surfaces of the corner connection bending portion and the corner connection thermal insulation member as the non-bonding area during the bonding of the upper connection block, or even if it overflows, it can prevent the corner connection bending portion and the corner connection wall or the corner primary thermal insulation member of the upper block adjacent to the corner connection thermal insulation member from being bonded.

[0035] Furthermore, according to the liquefied gas storage tank and the ship having the same of the present invention, after corner blocks are provided at the corner portions and flat blocks are provided at the flat portions, a spraying device is used to spray the thermal insulation material into the gaps formed at the portions where the corner blocks and the flat blocks meet due to tolerances of the tank hull. This facilitates the operation of filling gaps of varying sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a partial cross-sectional view of a flat portion of a liquefied gas storage tank for explaining the first embodiment of the present invention.

[0037] Figure 2 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining the first embodiment of the present invention.

[0038] Figure 3 It is a diagram showing the results of structural analysis of a corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.

[0039] Figure 4 FIG. 1 is a diagram showing another structural analysis result of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.

[0040] Figure 5 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a second embodiment of the present invention.

[0041] Figure 6 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the second embodiment of the present invention.

[0042] Figure 7 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a third embodiment of the present invention.

[0043] Figure 8 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the third embodiment of the present invention.

[0044] Figure 9 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a fourth embodiment of the present invention.

[0045] Figure 10 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a fourth embodiment of the present invention.

[0046] Figure 11 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a fifth embodiment of the present invention.

[0047] Figure 12 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a fifth embodiment of the present invention.

[0048] Figure 13 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a sixth embodiment of the present invention.

[0049] Figure 14 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a sixth embodiment of the present invention.

[0050] Figure 15 It is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a seventh embodiment of the present invention.

[0051] Figure 16 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention.

[0052] Figure 17 It is a partial front view of a corner portion of a liquefied gas storage tank for explaining an eighth embodiment of the present invention.

[0053] Figure 18 It is a partial front view of a corner portion of a liquefied gas storage tank for explaining a ninth embodiment of the present invention.

[0054] Figure 19 Is used to illustrate Figure 18 A perspective view of the upper block.

[0055] Figure 20 Is used to illustrate Figure 18 A perspective view of the upper connecting block.

[0056] Figure 21 yes Figure 19 Exploded perspective view of the upper block.

[0057] Figure 22 yes Figure 19 Cross-sectional view of the upper block.

[0058] Figure 23 It shows Figure 19 A cross-sectional view of another embodiment of an upper block.

[0059] Figure 24 Is used to illustrate Figure 18 A three-dimensional image of the filling piece.

[0060] Figure 25 Is used to illustrate Figure 18 FIG. 4 is a diagram of an anti-sticking member suitable for use in an upper connection block of FIG.

[0061] Figure 26 Is used to illustrate Figure 18 FIG. 2 is a diagram of another embodiment of an anti-sticking member suitable for use in an upper connecting block of FIG.

[0062] Figure 27 (a) and (b) are used to illustrate Figure 18 FIG. 1 is a diagram of another embodiment of an upper block and an upper connecting block.

[0063] Figure 28 It is applicable Figure 27 A partially enlarged front view of the upper block and the corner portion of the upper connecting block.

[0064] Figure 29 (a) and (b) are used to illustrate Figure 18 FIG. 2 is a diagram of yet another embodiment of an upper block and an upper connecting block.

[0065] Figure 30 It is applicable Figure 29 A partially enlarged front view of the upper block and the corner portion of the upper connecting block.

[0066] Figure 31 (a) and (b) are diagrams showing the results of structural analysis of the wall-preventing fixing member of the present embodiment not provided with a reinforcement and the wall-preventing fixing member of the comparative example provided with a reinforcement.

[0067] Figure 32 (a) and (b) are diagrams showing the results of structural analysis of the structure (snipple) provided on the lower side of each of the wall-preventing fixing member of the present embodiment not equipped with a reinforcement and the wall-preventing fixing member of the comparative example equipped with a reinforcement.

[0068] Figure 33 It is a diagram for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention. DETAILED DESCRIPTION

[0069] The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings. It should be noted that when reference numerals are assigned to structural elements in the drawings throughout this specification, identical structural elements should be assigned the same reference numerals in other drawings whenever possible. Furthermore, in describing the present invention, if a detailed description of a related known technology is determined to be unnecessary and detrimental to the purpose of the present invention, such description will be omitted.

[0070] In addition, the attached drawings are only for easier understanding of the embodiments in this specification, and do not limit the technical concept of this specification. It should be understood that all changes, equivalents and even substitutes included in the concept and technical scope of the present invention are included.

[0071] Furthermore, terms containing ordinal numbers such as first and second may be used to describe various structural elements, but the structural elements are not limited to these terms. These terms are used only to distinguish one structural element from other structural elements. Furthermore, throughout this specification, the term "outside" refers to the exterior side of a tank relative to a liquefied gas storage tank, and the term "inside" refers to the interior side of a tank relative to a liquefied gas storage tank.

[0072] In this specification, the term "liquefied gas" is used to encompass all gaseous fuels typically stored in a liquid state, such as LNG, LPG, ethylene, and ammonia. For ease of explanation, "liquefied gas" may also be referred to as "liquefied gas" when the gas is heated or pressurized and no longer in a liquid state. The same applies to boil-off gas. Furthermore, for ease of explanation, "LNG" includes not only liquid NG (Natural Gas) but also LNG in a supercritical state, and "boil-off gas" includes not only gaseous boil-off gas but also liquefied boil-off gas.

[0073] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0074] Figure 1 FIG. 1 is a partial cross-sectional view of a flat portion of a liquefied gas storage tank for explaining a first embodiment of the present invention. Figure 2is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining the first embodiment of the present invention. Figure 3 FIG. 1 is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the first embodiment of the present invention. Figure 4 FIG. 1 is a diagram showing another structural analysis result of the corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.

[0075] Although not shown in the figure, the vessels described below, including liquefied gas storage tanks 1, may include not only merchant ships that transport cargo from a departure point to a destination, but also marine structures that float at a specific location offshore to perform specific operations. Furthermore, the liquefied gas storage tanks 1 of the present invention may include any type of tank that stores liquefied gas.

[0076] The liquefied gas storage tank 1 is provided on a ship and can store liquefied gas such as LNG, which is an extremely low-temperature substance (approximately -160°C to -170°C), and can include a plane structure and a corner structure. For example, the transverse walls in the front and rear directions of the liquefied gas storage tank 1, the floor between the transverse walls, the vertical walls, and the ceiling can be equivalent to a plane structure. In addition, for example, the structure where the transverse walls, floor, vertical walls, and ceiling of the liquefied gas storage tank 1 meet can be equivalent to a corner structure. Among them, the corner structure can include an obtuse-angle corner structure or a right-angle corner structure. In the case where the thickness of the primary insulation wall 3 or the secondary insulation wall 5 changes, it can be accompanied by a change in the obtuse-angle corner structure or the right-angle corner structure.

[0077] like Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 can be composed of a combination of multiple plane blocks, such as Figure 2 As shown, the corner structure of the liquefied gas storage tank 1 can be composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0078] like Figure 1 and Figure 2 As shown, the liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 is supported on the hull 7 by a mastic 6 disposed between the secondary insulation wall 5 and the hull 7.

[0079] Among them, the primary defense wall 2 can be composed of a flat primary defense wall 2a of a plane block and a corner primary defense wall 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary defense wall 4 can be composed of a flat secondary defense wall 41a of a plane block and a corner secondary defense wall 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block.

[0080] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0081] In such a liquefied gas storage tank 1, to optimize the thermal insulation performance and storage capacity, it may be necessary to optimize the thickness of the primary insulation wall 3 and the secondary insulation wall 5. For example, when polyurethane foam is used as the primary material of the primary insulation wall 3 and the secondary insulation wall 5, the total thickness (the sum of the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5) can be set within a range of 250 mm to 500 mm. In the present embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 of the planar block and the corner block can be the same or similar.

[0082] That is, in the case of previous liquefied gas storage tanks, the thickness of the primary insulation wall of the plane block and the corner block is about 1 / 3 thinner than the thickness of the secondary insulation wall. In contrast, in this embodiment, the thickness of the primary insulation wall 3 of the plane block and the corner block is the same as or similar to the thickness of the secondary insulation wall 5. The reason will be described later.

[0083] First refer to Figure 1 The flat portion of a liquefied gas storage tank 1 according to a first embodiment of the present invention will be described. The flat portion of the liquefied gas storage tank 1 is constructed from a combination of a plurality of planar blocks. The structure of the planar blocks of the liquefied gas storage tank 1 described below applies not only to the first embodiment but also to the second through eighth embodiments described below.

[0084] like Figure 1 As shown, the planar block of the liquefied gas storage tank 1 is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0085] The flat primary barrier 2a can be positioned on a flat portion of the first or second surface, which has a different angle, to form a storage space for liquefied gas, a cryogenic substance. The flat primary barrier 2a is constructed of metal. For example, the metal material can be, but is not limited to, stainless steel. Together with the flat secondary barrier 41a, the flat primary barrier 2a prevents leakage of the liquefied gas.

[0086] The flat primary barrier 2a is fixedly connected to the upper portion of the flat primary insulation wall 3a by a metal belt (not shown) and is in direct contact with the liquefied gas as a cryogenic substance stored in the liquefied gas storage tank 1.

[0087] Such a flat primary wall 2a is used to connect the flat block and Figure 2 The corner blocks shown are arranged adjacently and connected to seal the flat primary insulation wall 3a and Figure 2 The angle shown is primary barrier 2b.

[0088] The flat primary insulation wall 3a is designed to block heat intrusion from the outside and to withstand external impact or impact caused by internal sloshing of liquefied gas, and can be arranged between the flat primary barrier 2a and the flat secondary barrier 41a.

[0089] The flat primary insulation wall 3a can have a structure in which a flat primary plywood 31a and a flat primary insulation member 32a are stacked in sequence toward the outside of the flat primary prevention wall 2a. The thickness of the flat primary plywood 31a and the thickness of the flat primary insulation member 32a added together can be formed to a thickness of, for example, 160 mm to 250 mm, but is not limited thereto.

[0090] The flat primary clamping plate 31a may be provided between the flat primary barrier 2a and the flat primary heat insulating member 32a.

[0091] The flat primary heat insulating member 32a can be formed of a material having excellent heat insulating properties and excellent mechanical strength to block heat intrusion from the outside and be able to withstand external impact or impact caused by internal sloshing of liquefied gas.

[0092] The flat primary insulation member 32a may be formed of polyurethane foam between the flat primary plywood 31a and the flat secondary barrier wall 4a, and occupy most of the thickness of the flat primary insulation wall 3a.

[0093] The flat primary insulation wall 3a forms part of a planar block along with the flat secondary insulation wall 41a and the flat secondary insulation wall 5a. The flat primary insulation wall 3a constituting the planar block can have a width smaller than that of the flat secondary insulation wall 5a, another component of the planar block. This allows portions of the flat secondary insulation wall 41a to be exposed on both sides of the flat primary insulation wall 3a. When multiple planar blocks are arranged adjacently, a flat connecting insulation wall 33a can be provided in the spaces between adjacently arranged flat primary insulation walls 3a, i.e., in the spaces where the flat secondary insulation walls 41a are exposed.

[0094] The flat connecting insulation wall 33a is configured between adjacent flat primary insulation walls 3a when the planar blocks are configured adjacent to each other. It can be configured as a stack of flat connecting splints 331a and flat connecting insulation members 332a that are the same or similar to the flat primary insulation wall 3a, and has the same or similar thickness as the flat primary insulation wall 3a.

[0095] Such a flat connection heat insulating wall 33a is arranged together with the flat connection prevention wall 42a to seal the space portion generated between the flat secondary heat insulating walls 5a adjacently arranged when a plurality of flat blocks are adjacently arranged, thereby performing the function of blocking heat intrusion from the outside.

[0096] The flat secondary barrier 41a may be provided between the flat primary insulation wall 3a and the flat secondary insulation wall 5a, and may prevent the liquefied gas from leaking to the outside together with the flat primary barrier 2a.

[0097] The flat secondary barrier 41a is formed as part of a planar block together with the flat primary insulation wall 3a and the flat secondary insulation wall 5a. When the planar blocks are adjacently arranged, adjacent flat secondary barrier 41a can be connected by the flat connecting barrier 42a.

[0098] The flat connecting barrier 42a can connect adjacent flat secondary barrier 41 exposed to the outside when the flat blocks are adjacently arranged, and a flat connecting heat insulating wall 33a can be provided on the upper part.

[0099] The flat secondary insulation wall 5a can be designed to, together with the flat primary insulation wall 3a and the flat connecting insulation wall 33a, block external heat intrusion and withstand external impacts or impacts caused by internal sloshing of liquefied gas. Furthermore, the flat secondary insulation wall 5a can be positioned between the flat secondary barrier 4a and the hull 7 and can include a flat secondary insulation member 51a and a flat secondary clamping plate 52a.

[0100] The flat secondary insulation wall 5a can have a structure in which a flat secondary insulation piece 51a and a flat secondary plywood 52a are stacked in sequence toward the outside of the flat secondary protection wall 41a. The overall thickness of the flat secondary insulation piece 51a and the flat secondary plywood 52a added together can be formed to, for example, 150 mm to 240 mm, which is the same or similar to the thickness of the flat primary insulation wall 3a, but is not limited thereto.

[0101] The flat secondary thermal insulation member 51a can be formed of a material having excellent thermal insulation performance and excellent mechanical strength to block heat intrusion from the outside and be able to withstand impact from the outside or impact caused by liquefied gas shaking inside.

[0102] The flat secondary heat insulating member 51a may be formed of polyurethane foam between the flat secondary prevention wall 41a and the flat secondary plywood 52a, and occupy most of the thickness of the flat secondary heat insulating wall 5a.

[0103] The flat secondary clamping plate 52 a may be provided between the flat secondary thermal insulation member 51 a and the hull 7 .

[0104] As described above, the planar block of the liquefied gas storage tank 1 of this embodiment can be configured so that the flat connecting insulation wall 33a included in the flat primary insulation wall 3a has a thickness that is the same as or similar to the thickness of the flat secondary insulation wall 5a. To achieve this configuration, the flat connecting insulation member 332a of the flat connecting insulation wall 33a is configured to have a thickness that is 90% to 110% of the thickness of the flat secondary insulation member 51a. Thus, the flat connecting insulation member 332a of the flat connecting insulation wall 33a is configured to have a thickness that is the same as or similar to that of the flat secondary insulation member 51a.

[0105] That is, in the case of previous liquefied gas storage tanks, the thickness of the primary insulation wall of the planar block is about 1 / 3 thinner than the thickness of the secondary insulation wall. In comparison, the thickness of the flat primary insulation wall 3a of the planar block in this embodiment is the same as or similar to the thickness of the flat secondary insulation wall 5a. This is to prevent damage caused by low-temperature stress of the flat secondary insulation wall 41a.

[0106] Generally speaking, the flat secondary barrier 41a and the flat secondary insulation wall 5a experience differences in their own shrinkage due to the temperature they are exposed to. In the case of the flat secondary barrier 41a and the flat secondary insulation wall 5a, the thinner the thickness of the flat connecting insulation wall 33a, the more likely it is to be affected by the cold and heat of the extremely low-temperature liquefied gas. In addition, in this case, the shrinkage itself increases as the temperature decreases, and stress increases at low temperatures, thereby increasing the risk of damage to the flat secondary barrier 41a. This problem is particularly common in the flat connecting barrier 42a, which connects the flat secondary barrier 41a to each other at the bottom of the flat connecting insulation wall 33a using bonding or the like. This is because at the bottom of the flat connecting insulation wall 33a, the two ends of the flat connecting barrier 42a are connected to the flat secondary barrier 41a of multiple adjacent planar blocks. As the flat secondary insulation wall 5a of the planar blocks shrinks, the two ends of the flat connecting barrier 42a may deform to move away from or closer to each other.

[0107] In this embodiment, by making the flat primary insulation wall 3a, including the flat connecting insulation wall 33a, and the flat secondary insulation wall 5a of equal or similar thickness, the relatively thicker flat primary insulation wall 3a, including the flat connecting insulation wall 33a, reduces the extreme low-temperature stress on not only the flat secondary insulation wall 41a but also the flat connecting insulation wall 42a. Furthermore, the relatively thinner flat secondary insulation wall 5a reduces its own shrinkage, thus reducing its stress at low temperatures. As a result, the risk of damage to the secondary insulation wall 4 is reduced compared to conventional methods in areas where multiple planar blocks are adjacent.

[0108] Reference Figure 2 The following describes the corner portion of a liquefied gas storage tank 1 according to a first embodiment of the present invention. The corner portion of the liquefied gas storage tank 1 can be formed by combining multiple corner blocks. The corner structure of the liquefied gas storage tank 1 described below uses an obtuse angle of 135 degrees as an example, but is not limited to this value.

[0109] like Figure 2 As shown, the corner block of the liquefied gas storage tank 1 is located at the corner where a first surface and a second surface, each having different angles, meet, forming a storage space for liquefied gas. The corner block includes: a corner primary insulation wall 3b, to which a metal primary barrier 2b is fixed and disposed outside the primary barrier 2b; a corner secondary barrier 41b, disposed outside the primary insulation wall 3b; and a corner secondary insulation wall 5b, disposed outside the secondary barrier 41b. The primary insulation wall 3b may also include an inner bent portion 3b3.

[0110] Primary corner barrier 2b is located at a corner where the first or second surfaces, which have different angles, meet, forming a storage space for liquefied gas, a cryogenic substance. Primary corner barrier 2b, which can be made of metal, can work together with secondary corner barrier 41b to prevent leakage of liquefied gas.

[0111] Although not in Figure 2 As shown in the figure, the corner primary barrier 2b can be fixed to the corner primary insulation wall 3b by using a barrier fixing member provided at the upper end of the corner primary insulation wall 3b in various ways such as bonding or bolting, thereby directly contacting the liquefied gas, which is the cryogenic substance stored in the liquefied gas storage tank 1. Therefore, the corner primary barrier 2b described below can be used to include the barrier fixing member.

[0112] Such a corner once wall 2b can be used in the corner block and Figure 1 When the planar blocks shown are adjacently arranged and connected, the sealed corner primary insulation wall 3b and Figure 1 The flat primary defense wall 2a shown, and the inner primary clamp 31b fixed to the inner first fixing part 3b1 and the inner primary clamp 31b of the inner second fixing part 3b2, the inner surface of the heat insulation part 3b31 of the inner bending part 3b3 can be bent at a predetermined angle, for example, at an angle of 135 degrees.

[0113] The corner primary insulation wall 3b can be designed to block heat intrusion from the outside and be able to withstand impact from the outside or impact caused by liquefied gas shaking inside, and is set between the corner primary defense wall 2b and the corner secondary defense wall 41b.

[0114] The corner primary insulation wall 3b is respectively arranged on the inner side of the first surface and the second surface, and may include an inner first fixing part 3b1 and an inner second fixing part 3b2 composed of a structure in which an inner primary plywood 31b, a corner primary insulation part 32b, and an outer primary plywood 33b are stacked in sequence toward the outer side of the corner primary insulation wall 2b.

[0115] The inner first fixing portion 3b1 can be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 can be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0116] In addition, the corner primary heat insulating wall 3b may include an inner bent portion 3b3, which is formed by filling a heat insulating member 3b31 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2.

[0117] In such a corner primary insulation wall 3b, the thickness obtained by adding the thickness of the inner primary plywood 31b, the thickness of the corner primary insulation member 32b, and the thickness of the outer primary plywood 33b can be the same as the thickness of the aforementioned flat primary insulation wall 3a (for example, a thickness of 160 mm to 250 mm).

[0118] The inner primary clamping plate 31b can be set between the corner primary barrier 2b and the corner primary heat insulating member 32b.

[0119] In this embodiment, as described above, the primary insulation wall 3 in the plane block and the corner block is formed relatively thicker than the thickness of the previous primary insulation wall. Therefore, the thickness of the inner primary plywood 31b of the corner primary insulation wall 3b constituting the corner block can be reduced, and the remaining thickness can be replaced by the corner primary insulation part 32b formed by polyurethane foam.

[0120] The thickness of the inner primary clamping plate 31b of this embodiment can be 20 mm to 80 mm.

[0121] As described above, in this embodiment, the inner first fixing part and the inner second fixing part 3b1 and 3b2 of the wall fixing member for supporting the fixed corner primary wall 2b in the corner block are not composed of only a plywood with a thickness of about 92 mm as in the past, but are formed in combination with the corner primary insulation member 32b of polyurethane foam. Therefore, compared with the previous situation where it is composed only of plywood, the thermal insulation performance can be improved, the weight can be reduced, and the cost can be reduced.

[0122] The corner primary insulation member 32b can be arranged between the inner primary plywood 31b and the outer primary plywood 33b, and is formed into a high-density polyurethane foam having excellent thermal insulation performance and excellent mechanical strength to block heat intrusion from the outside and be able to withstand impacts from the outside or impacts caused by the shaking of liquefied gas inside.

[0123] The outer primary clamping plate 33b can be arranged between the corner primary heat insulating member 32b and the corner secondary barrier 41b, and fixed to the corner secondary barrier 41b.

[0124] The outer primary clamping plate 33b may be formed to have a thickness of 6.5 mm to 15 mm.

[0125] As described above, the corner primary insulation wall 3b of this embodiment is constructed as a structure in which the inner primary plywood 31b, the corner primary insulation member 32b, and the outer primary plywood 33b are stacked in sequence. Thus, the high-strength inner primary plywood 31b and the outer primary plywood 33b support the thermal contraction of the corner primary insulation member 32b, thereby avoiding the thermal contraction of the corner primary insulation member 32b being directly applied to the secondary barrier 4, 41b, 42b between the outer first fixing part and the outer second fixing part 5b1 and 5b2, and by providing the corner primary insulation member 32b as an intermediate layer, tolerance management of the inner primary plywood 31b and the outer primary plywood 33b, which are sensitive to humidity, can be easily performed.

[0126] The inner first fixing portion and the inner second fixing portion 3b1 and 3b2 constituting the corner primary heat insulating wall 3b are respectively fixed to the outer first fixing portion and the outer second fixing portion 5b1 and 5b2 constituting the corner secondary barrier 41b and the corner secondary heat insulating wall 5b. The width of each of the inner first fixing portion and the inner second fixing portion 3b1 and 3b2 can be smaller than the width of each of the outer first fixing portion and the outer second fixing portion 5b1 and 5b2. Thus, when a plurality of corner blocks are arranged adjacently along the edges of the corner portion facing the first and second faces having different angles, the inner bent portion 3b3 can be formed in the space between the adjacently arranged inner first fixing portion and the inner second fixing portion 3b1 and 3b2, that is, the space where the corner secondary barrier 41b is exposed.

[0127] The inner bent portion 3b3 may be filled with a heat insulating member 3b31.

[0128] The heat insulating member 3b31 of the inner bending portion 3b3 may be low-density polyurethane foam, and a secondary barrier 4 including a stacked corner secondary barrier 41b and a corner connecting barrier 42b may be provided on the outer surface bent at a predetermined angle, such as 135 degrees.

[0129] Such a heat insulating part 3b31 of the inner bending part 3b3 can seal the space part generated between the outer first fixing part and the outer second fixing part 5b1 and 5b2 which are adjacently arranged when multiple corner blocks are adjacently arranged together with the corner connecting wall 42b, thereby performing the function of blocking the intrusion of heat from the outside.

[0130] The corner secondary barrier 41b can be provided outside the corner primary insulation wall 3b. The corner secondary barrier 41b can be provided between the corner primary insulation wall 3b and the corner secondary insulation wall 5b, and can prevent the liquefied gas from leaking to the outside together with the corner primary barrier 2b.

[0131] The corner secondary defense wall 41b is constituted as a part of the corner block together with the corner primary insulation wall 3b and the corner secondary insulation wall 5b. When the corner blocks are adjacent to each other, the adjacent corner secondary defense walls 41b between the outer first fixing part and the outer second fixing part 5b1 and 5b2 can be connected by the corner connecting defense wall 42b.

[0132] Corner connecting wall 42b connects adjacent corner secondary walls 41b that are exposed to the outside when the corner blocks are adjacently arranged. The heat insulating member 3b31 having the inner bent portion 3b3 disposed on its upper portion seals the space between the outer first and outer second fixing portions 5b1 and 5b2 adjacent to the heat insulating member 3b31 of the inner bent portion 3b3, thereby blocking heat intrusion from the outside. In this embodiment, corner connecting wall 42b can be extended to a length that not only overlaps the inner first and inner second fixing portions 3b1 and 3b2, but also overlaps at least the inner first and inner second fixing portions 3b1 and 3b2.

[0133] At the position where the outer first fixing portion and the outer second fixing portion 5b1 and 5b2 meet, the secondary barrier 4 in which the corner secondary barrier 41b and the corner connecting barrier 42b are stacked can be configured in a bent manner.

[0134] The corner secondary insulation wall 5b can be positioned outside the corner secondary barrier 41b. Together with the corner primary insulation wall 3b and the insulation member 3b31 of the inner bent portion 3b3, the corner secondary insulation wall 5b can be designed to block external heat intrusion and withstand external impacts or impacts caused by internal sloshing of liquefied gas. Furthermore, the corner secondary insulation wall 5b can be positioned between the corner secondary barrier 4b and the hull 7 and can include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b.

[0135] The corner secondary insulation wall 5b is fixed on the inner side of the first surface and the second surface respectively, and may include: an outer first fixing part 5b1 and an outer second fixing part 5b2, which is composed of a structure in which an inner secondary plywood 51b, a corner secondary insulation part 52b, and an outer secondary plywood 53b are stacked in sequence toward the outer side of the corner secondary protection wall 2b.

[0136] The outer first fixing portion 5b1 may be fixed to the inner side of the first surface, and the outer second fixing portion 5b2 may be fixed to the inner side of the second surface.

[0137] The side surfaces facing the outer first fixing portion 5b1 fixed to the first surface and the outer second fixing portion 5b2 fixed to the second surface can be configured to be inclined in the direction ED that divides the corner portion equally. Although this embodiment describes an evenly divided corner portion, this is not limiting. The corner portion can also be divided unevenly depending on its position. Therefore, it is also acceptable to configure the corner portion to be inclined in the direction ED that divides the corner portion unevenly.

[0138] In such a corner secondary insulation wall 5b, the overall thickness obtained by adding the thickness of the inner secondary plywood 51b, the thickness of the corner secondary insulation member 52b, and the thickness of the outer secondary plywood 53b can be the same as the thickness of the aforementioned flat secondary insulation wall 5a (for example, a thickness of 150 mm to 240 mm).

[0139] The inner secondary plywood 51b may be disposed between the corner secondary barrier 2b and the corner secondary heat insulating member 51b, and the corner secondary barrier 2b may be fixed to the inner secondary plywood 51b. The inner secondary plywood 51b may be formed to a thickness of 6.5 mm to 15 mm.

[0140] The corner secondary thermal insulation member 52b can be formed of a material having excellent thermal insulation performance and excellent mechanical strength to block heat intrusion from the outside and be able to withstand impact from the outside or impact caused by liquefied gas sloshing inside.

[0141] The corner secondary insulation member 52b may be formed of polyurethane foam between the inner secondary sandwich panel 51b and the outer secondary sandwich panel 53b and occupy most of the thickness of the corner secondary insulation wall 5b.

[0142] The outer secondary clamping plate 53b may be provided between the corner secondary heat insulating member 52b and the hull 7. The outer secondary clamping plate 53b may be formed to a thickness of 6.5 mm to 25 mm.

[0143] In the liquefied gas storage tank 1 of the present embodiment described above, as the thickness of the primary insulation wall 3 is formed relatively thicker than before, the secondary barrier 4 moves not only from the plane block but also from the corner block toward the hull 7 side, and the curvature radius becomes larger. In this case, the curvature radius of the secondary barrier 4 becomes larger at the corner portion, so that the length of the portion of the secondary barrier 4 that is not bonded to the secondary insulation wall 5 will also increase. This means that the flexibility of the secondary barrier 4 in the obtuse corner structure increases, and thus, in the obtuse corner structure, the deformation absorption of the peripheral portion of the secondary barrier 4, such as the hull deformation absorption, will become easier, and the low-temperature stress will also be reduced. In the case of the present embodiment, the length of the unbonded portion is, for example, 0 mm to 100 mm, preferably 50 mm to 100 mm.

[0144] As described above, the secondary barrier 4 in the obtuse corner structure of the present invention can reduce the stress applied to the secondary barrier 4 at low temperatures compared to conventional obtuse corner structures formed of relatively thin primary insulation walls 3. Furthermore, since the unbonded portion increases, it is easier to absorb hull deformation.

[0145] This can be done by Figure 3 as well as Figure 4 This is confirmed by the structural analysis results of the corner portion of the liquefied gas storage tank 1 of this embodiment.

[0146] The structural analysis was performed under the conditions of 20°C at the hull and 163°C at the primary barrier. A heat transfer analysis was performed, and the structural analysis was performed using the temperature distribution obtained from the results.

[0147] In addition, in the previous liquefied gas storage tank used for comparison of the results of the structural analysis of the liquefied gas storage tank 1 of the present embodiment, the thickness of the primary insulation wall of the plane block and the corner block is about 1 / 3 thinner than the thickness of the secondary insulation wall, which is equivalent to the case where the fixing components of the inner first fixing part and the inner second fixing part 3b1, 3b2 are only composed of plywood, and the length of the unbonded part is 50 mm. In such a previous liquefied gas storage tank, the stress value in the YY direction of the bent part of the secondary insulation wall is about 66.8984 MPa, and the temperature is about -135.857°C.

[0148] The stress value in the YY direction obtained from the structural analysis results is used as the stress value at the corner. The lower the value, the less stress there is. The temperature is used as the temperature at the corner. The higher the temperature, the less stress there is (the value after the change after setting at room temperature 25°C is shown).

[0149] The above conditions are applicable not only to the present embodiment but also to the structural analysis of the liquefied gas storage tank 1 according to the second to seventh embodiments described below.

[0150] Figure 3The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other when the unbonded portion is 50 mm in this embodiment show a YY-direction stress value of 37.155 MPa and a temperature of -57.940°C. Compared to conventional liquefied gas storage tank secondary barrier walls, which exhibit YY-direction stress values ​​of approximately 66.8984 MPa and a temperature of approximately -135.857°C at the bent portion, these values ​​significantly reduce the stress on the secondary barrier walls 4, 41b, and 42b in this embodiment. Furthermore, this means that the secondary barrier walls 4, 41b, and 42b in this embodiment are less susceptible to damage from cryogenic stress, such as damage from extremely low-temperature materials, than conventional ones.

[0151] Figure 4 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other when the unbonded portion is 97 mm in this embodiment are shown. The YY-direction stress value is 12.084 MPa, and the temperature is -59.025°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C at the bent portion of the secondary barrier wall in conventional liquefied gas storage tanks, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b in this embodiment is significantly less. Furthermore, this indicates that the secondary barrier walls 4, 41b, and 42b in this embodiment are less susceptible to damage from cryogenic stress, such as damage from extremely low-temperature materials, than conventional ones.

[0152] Therefore, in this embodiment, the inner first fixing part and the inner second fixing part 3b1 and 3b2 of the wall fixing member for supporting the fixed corner primary wall 2b in the corner block are not composed only of plywood, but are formed by a structure combined with the polyurethane foam insulation part 3b31. Therefore, compared with the previous structure composed only of plywood, the thermal insulation performance can be improved, the weight can be reduced, and the cost can be reduced.

[0153] In addition, in this embodiment, the corner primary insulation wall 3b of the corner block connected to the flat primary insulation wall 3a of the plane block and the corner secondary insulation wall 5b of the corner block connected to the flat secondary insulation wall 5a of the plane block are constructed to be the same or similar in thickness. Therefore, compared with the past, the thickness of the corner primary insulation wall 3b is relatively thicker (it should be noted that the thickness of the corner secondary insulation wall 5b is a thickness that can maintain the mechanical strength at a specified level), which can reduce the low temperature burden and shaking burden of the secondary defense walls 4, 41b, and 42b between the outer first fixing part and the outer second fixing part 5b1 and 5b2, and can not only prevent damage to the secondary defense walls 4, 41b, and 42b, but also reduce the low temperature burden of the secondary defense walls 4, 41b, and 42b, thereby preventing brittle failure of the hull 7.

[0154] In addition, in this embodiment, the thickness of the corner primary insulation wall 3b is relatively thicker than before, so the length of the portion of the secondary barrier 4, 41b, 42b that is not bonded to the corner secondary insulation wall 5b can be increased. As a result, not only can the damage probability of the secondary barrier 4, 41b, 42b be further reduced by increasing the flexibility of the secondary barrier 4, 41b, 42b, but the absorption of hull deformation of the secondary barrier 4, 41b, 42b becomes easier, and low-temperature stress can also be further reduced.

[0155] Figure 5 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a second embodiment of the present invention. Figure 6 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the second embodiment of the present invention.

[0156] As mentioned above Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment can be composed of a combination of multiple plane blocks, such as Figure 5 As shown, the corner structure of the liquefied gas storage tank 1 can be composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0157] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is as follows: Figure 1 , which is the same or similar to the above structure. Figure 1 As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0158] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 5 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0159] like Figure 1 as well as Figure 5 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0160] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0161] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0162] like Figure 5 As shown, the corner portion of the liquefied gas storage tank 1 of the second embodiment of the present invention can be composed of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below can be an obtuse corner structure forming a predetermined angle, for example, 135 degrees.

[0163] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0164] Corner primary barrier 2b can be positioned at a corner where the first or second surfaces, which have different angles, meet to form a storage space for liquefied gas, a cryogenic substance, and can be constructed of metal. Corner primary barrier 2b, along with corner secondary barrier 41b, can prevent leakage of the liquefied gas.

[0165] The primary corner barrier 2b of this embodiment is substantially the same as or similar to the first embodiment described above, and therefore a detailed description thereof is omitted. It should be noted that, in the primary corner barrier 2b of this embodiment, the angle of the bend of the primary corner insulation wall 3b may differ due to the different structure of the primary corner insulation wall 3b from the first embodiment. This will be further described when describing the primary corner insulation wall 3b.

[0166] The corner primary insulation wall 3b is designed to block external heat intrusion and withstand external impacts or shocks caused by internal sloshing of liquefied gas. It is located between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary insulation wall 3b of this embodiment is identical or similar to that of the first embodiment, except for the omission of the outer primary plywood 33b and the inclusion of an inner bent portion 3b3 formed by a filler insulation member 3b31. The following description will focus on the differences.

[0167] The corner primary insulation wall 3b is disposed on the inner sides of the first and second surfaces, respectively, and may include an inner first fixing portion 3b1 and an inner second fixing portion 3b2, formed by stacking an inner primary clamping plate 31b and a corner primary insulation member 32b in sequence outward from the corner primary insulation wall 2b. The inner primary clamping plate 31b and the corner primary insulation member 32b of this embodiment are identical or similar to those of the first embodiment described above, and thus, a detailed description thereof will be omitted to avoid duplication.

[0168] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0169] In addition, the corner primary insulation wall 3b may include an inner intermediate fixing portion 3b12 provided between the inner first fixing portion 3b1 and the inner second fixing portion 3b2.

[0170] The inner middle fixing part 3b12 may include: a corner middle heat insulation member 32b12, fixed to the corner connecting wall 42b connecting the adjacent corner secondary walls 41b; and an inner middle splint 31b12, arranged on the inner side of the corner middle heat insulation member 32b12 and fixed to the corner primary wall 2b.

[0171] The inner intermediate clamping plate 31b12 may be formed into a structure that is the same as or similar to the inner primary clamping plate 31b, and may fix the corner primary barrier 2b together with the inner primary clamping plate 31b.

[0172] When the corner portion is equally divided, the inner intermediate plate 31b12 may be parallel to a direction perpendicular to the equally divided direction ED. It should be noted that when the corner portion is unequally divided, the inner intermediate plate 31b12 may not be parallel to a direction perpendicular to the corner portion dividing direction ED.

[0173] The corner intermediate heat insulating member 32b12 may be formed of the same or similar material as the corner primary heat insulating member 32b. The corner intermediate heat insulating member 32b12 may be formed of high-density polyurethane foam.

[0174] Such a corner intermediate thermal insulator 32b12 can, together with the corner connecting barrier 42b, seal the space created between the adjacent outer first and second fixing portions 5b1 and 5b2 when multiple corner blocks are arranged adjacently, thereby blocking heat intrusion from the outside. In this embodiment, the corner connecting barrier 42b can be extended to a length that not only overlaps the inner first and second fixing portions 3b1 and 3b2, but also overlaps at least the inner first and second fixing portions 3b1 and 3b2.

[0175] The inner middle clamping plate 31b12 is arranged between the inner first fixing part 3b1 and the inner second fixing part 3b2, so that the corner primary prevention wall 2b can be fixed to the inner primary clamping plate 31b of the inner first fixing part 3b1, the inner middle clamping plate 31b12 of the inner middle fixing part 3b12 and the inner primary clamping plate 31b of the inner second fixing part 3b2, and can be configured to bend at an angle range of 150 degrees to 160 degrees between the inner first fixing part 3b1 and the inner middle fixing part 3b12 and between the inner middle fixing part 3b12 and the inner second fixing part 3b2.

[0176] Therefore, in this embodiment, a predetermined interval is separated between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 which are respectively arranged on the inner sides of the first surface and the second surface having different angles from each other, and an inner intermediate fixing portion 3b12 is provided between the inner first fixing portion and the inner second fixing portion 3b1 and 3b2. Thus, the inner intermediate fixing portion 3b12 can be utilized to alleviate the bending angle of the corner primary defense wall 2b, thereby not only reducing the shaking burden of the corner primary defense wall 2b, but also increasing the mechanical strength of the corner part.

[0177] Corner secondary barrier 41b can be disposed between corner primary insulation wall 3b and corner secondary insulation wall 5b. When the corner blocks are arranged adjacently, adjacent corner secondary barrier 41b between the first and second outer fixing portions 5b1 and 5b2 can be connected by a corner connecting barrier 42b. Together with corner primary barrier 2b, these barriers can prevent leakage of liquefied gas. The corner secondary barrier 41b of this embodiment is identical or similar to that of the first embodiment described above, and a detailed description thereof will be omitted to avoid duplication.

[0178] The corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. The corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may include an outer first fixing portion 5b1 and an outer second fixing portion 5b2. The inner secondary plywood 51b, the corner secondary insulation member 52b, and the outer secondary plywood 53b are stacked in this order toward the outer side of the corner secondary insulation wall 2b.

[0179] The corner secondary heat-insulating wall 5b of this embodiment is the same as or similar to that of the aforementioned first embodiment, and detailed description thereof will be omitted to avoid duplication.

[0180] Figure 6 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other are shown. The YY-direction stress value is 10.982 MPa, and the temperature is -67.914°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C at the bent portion of the secondary barrier wall of a conventional liquefied gas storage tank, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress, such as the effects of heat and cold from extremely low-temperature materials, than conventional ones.

[0181] Figure 7 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a third embodiment of the present invention. Figure 8 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the third embodiment of the present invention.

[0182] As mentioned above Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment can be composed of a combination of multiple plane blocks, such as Figure 7 As shown, the corner structure of the liquefied gas storage tank 1 can be composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0183] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is similar to that of the reference Figure 1 The aforementioned structure is the same or similar. Figure 1 As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0184] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 7 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0185] like Figure 1 as well as Figure 7 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0186] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0187] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0188] like Figure 7As shown, the corner portion of the liquefied gas storage tank 1 of the third embodiment of the present invention can be composed of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below can be an obtuse corner structure forming a predetermined angle, for example, 135 degrees.

[0189] Unlike the accompanying drawings, the position of the corner primary insulation wall 3b can be located in a manner that allows the corner secondary barrier 41b constructed on the corner secondary insulation wall 5b to be exposed from the center portion of the corner. Therefore, the exposed corner secondary barrier 41b can be constructed by connecting the corner connecting barrier 42b to each other, or the corner connecting barrier 42b can be constructed in a manner that allows the corner primary insulation wall 3b to connect the adjacently arranged corner secondary barrier 41b, and then stacked above the corner secondary barrier 41b / corner connecting barrier 42b. In this embodiment, the corner connecting barrier 42b can be extended to form a length that not only overlaps between the inner first fixing portion and the inner second fixing portion 3b1 and 3b2, but also overlaps at least the inner first fixing portion and the inner second fixing portion 3b1 and 3b2.

[0190] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0191] Corner primary barrier 2b can be positioned at a corner where the first or second surfaces, which have different angles, meet to form a storage space for liquefied gas, a cryogenic substance, and can be constructed of metal. Corner primary barrier 2b, along with corner secondary barrier 41b, can prevent leakage of the liquefied gas.

[0192] The corner primary barrier 2b of this embodiment is basically the same as or similar to the aforementioned first embodiment, so its detailed description is omitted.

[0193] The corner primary insulation wall 3b is designed to block external heat intrusion and withstand external impacts or shocks caused by internal sloshing of liquefied gas. It is located between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary insulation wall 3b of this embodiment is identical or similar to that of the first embodiment, except for the omission of the outer primary clamping plate 33b. This description will focus on the differences.

[0194] The corner primary insulation wall 3b is disposed on the inner sides of the first and second surfaces, respectively, and may include an inner first fixing portion 3b1 and an inner second fixing portion 3b2, formed by stacking an inner primary clamping plate 31b and a corner primary insulation member 32b in sequence outward from the corner primary insulation wall 2b. The inner primary clamping plate 31b and the corner primary insulation member 32b of this embodiment are identical or similar to those of the first embodiment described above, and thus, a detailed description thereof will be omitted to avoid duplication.

[0195] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0196] Furthermore, the corner primary insulation wall 3b may include an inner bent portion 3b3 formed by filling a thermal insulation member 3b32 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The thermal insulation member 3b32 of the inner bent portion 3b3 of this embodiment may be the same as or similar to that of the first embodiment described above, and thus, a detailed description thereof will be omitted to avoid duplication.

[0197] The corner secondary barrier 41b can be set between the corner primary insulation wall 3b and the corner secondary insulation wall 5b. When the corner blocks are adjacent to each other, the adjacent corner secondary barriers 41b between the outer first fixing portion and the outer second fixing portion 5b1 and 5b2 can be connected by the corner connecting barrier 42b, and can prevent the liquefied gas from leaking to the outside together with the corner primary barrier 2b. The basic structure of the corner secondary barrier 41b of this embodiment can be the same as or similar to that of the aforementioned first embodiment. It should be noted that as the partial structure of the corner secondary insulation wall 5b is different from that of the aforementioned first embodiment, the configuration relationship of the corner secondary barrier 41b including the corner connecting barrier 42b of this embodiment may be different. This will be described below when explaining the corner secondary insulation wall 5b.

[0198] The corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. The corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may include an outer first fixing portion 5b1 and an outer second fixing portion 5b2. The inner secondary plywood 51b, the corner secondary insulation member 52b, and the outer secondary plywood 53b are stacked in this order toward the outer side of the corner secondary insulation wall 2b.

[0199] The facing side surfaces of the outer first fixing portion 5b1 and the outer second fixing portion 5b2 can be configured to be inclined in the direction ED that equally divides the corner portion. Although this embodiment describes an evenly divided corner portion, the present invention is not limited thereto. The corner portion can be divided unevenly depending on its position, and thus, the side surfaces can be configured to be inclined in the direction ED that unequally divides the corner portion.

[0200] The outer first fixing portion 5 b 1 and the outer second fixing portion 5 b 2 may form cavities at corners facing each other.

[0201] In addition, the corner secondary insulation wall 5b may include an outer bending portion 5b3, including an insulation member 5b31 filled between the cavity portions of the outer first fixing portion 5b1 and the outer second fixing portion 5b2. The insulation member 5b31 of the outer bending portion 5b3 may be low-density polyurethane foam.

[0202] By arranging the heat insulating member 5b31 of the outer bending portion 5b3 in the cavity portion of the outer first fixing portion 5b1 and the outer second fixing portion 5b2, the corner secondary defense wall 41b including the corner connecting defense wall 42b can be fixed to the inner secondary plywood 51b of the outer first fixing portion 5b1, the heat insulating member 5b31 of the outer bending portion 5b3 and the inner secondary plywood 51b of the outer second fixing portion 5b2, and can be configured to be bent at a predetermined angle, for example, 135 degrees, on the inner side of the heat insulating member 5b31 of the outer bending portion 5b3.

[0203] Therefore, in this embodiment, a cavity is formed at the corners facing the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are respectively fixed to the first surface and the second surface having different angles from each other, and an insulating member 5b31 having an outer bending portion 5b3 composed of low-density polyurethane foam is provided in the cavity. Thus, the thermal insulation performance of the corner portion can be further increased by utilizing low-density polyurethane foam.

[0204] Figure 8 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other are shown. The YY-direction stress value is 12.003 MPa, and the temperature is -64.358°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C at the bent portion of the secondary barrier wall of a conventional liquefied gas storage tank, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress, such as the effects of heat and cold from extremely low-temperature materials, than conventional ones.

[0205] Figure 9 1 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a fourth embodiment of the present invention. Figure 10 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a fourth embodiment of the present invention.

[0206] As mentioned above Figure 1As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment can be composed of a combination of multiple plane blocks, such as Figure 9 As shown, the corner structure of the liquefied gas storage tank 1 can be composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0207] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is similar to that of the reference Figure 1 The aforementioned structure is the same or similar. Figure 1 As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0208] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 9 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0209] like Figure 1 as well as Figure 9 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0210] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0211] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0212] like Figure 9 As shown, the corner portion of the liquefied gas storage tank 1 of the fourth embodiment of the present invention can be composed of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below can be an obtuse corner structure forming a predetermined angle, for example, 135 degrees.

[0213] Unlike the accompanying drawings, the position of the corner primary insulation wall 3b can be located in a manner such that the corner secondary barrier 41b constructed on the corner secondary insulation wall 5b is exposed from the center portion of the corner. Therefore, the exposed corner secondary barrier 41b can be constructed by connecting the corner connecting barrier 42b to each other, or the corner connecting barrier 42b can be constructed in a manner such that the corner primary insulation wall 3b connects the adjacently arranged corner secondary barrier 41b and then stacked above the secondary barrier 41b / corner connecting barrier 42b. In this embodiment, the corner connecting barrier 42b can be extended to form a length that not only overlaps between the inner first fixing portion and the inner second fixing portion 3b1 and 3b2, but also overlaps at least the inner first fixing portion and the inner second fixing portion 3b1 and 3b2.

[0214] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0215] Corner primary barrier 2b can be positioned at a corner where the first or second surfaces, which have different angles, meet to form a storage space for liquefied gas, a cryogenic substance, and can be constructed of metal. Corner primary barrier 2b, along with corner secondary barrier 41b, can prevent leakage of the liquefied gas.

[0216] The corner primary barrier 2b of this embodiment is basically the same as or similar to the aforementioned first embodiment, so its detailed description is omitted.

[0217] The corner primary insulation wall 3b is designed to block external heat intrusion and withstand external impacts or shocks caused by internal sloshing of liquefied gas. It is located between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary insulation wall 3b of this embodiment is identical or similar to that of the first embodiment, except for the omission of the outer primary clamping plate 33b and the modification of the inner bent portion 3b3. This description will focus on the modified structure.

[0218] The corner primary insulation wall 3b is disposed on the inner sides of the first and second surfaces, respectively, and includes a first inner fixing portion 3b1 and a second inner fixing portion 3b2. The structure is formed by stacking an inner primary clamping plate 31b and a corner primary insulation member 32b in this order, outward from the corner primary insulation wall 2b. The inner primary clamping plate 31b and corner primary insulation member 32b of this embodiment are identical or similar to those of the first embodiment, and thus, detailed descriptions thereof will be omitted to avoid duplication.

[0219] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0220] In addition, the corner primary insulation wall 3b may include: an inner bending portion 3b3, filled between the inner first fixing portion 3b1 and the inner second fixing portion 3b2, and including an outer insulation member 3b33 arranged on the corner secondary defense wall 41b including the corner connecting defense wall 42b and an inner insulation member 3b34 arranged between the outer insulation member 3b33 and the corner primary defense wall 2b.

[0221] The outer heat insulation member 3b33 of the inner bending portion 3b3 may be glass wool, and a secondary barrier 4 including a stacked corner secondary barrier 41b and a corner connecting barrier 42b may be provided on the outer surface bent at a predetermined angle, such as 135 degrees.

[0222] The inner heat insulating member 3b34 of the inner bent portion 3b3 may be low-density polyurethane foam, and a corner primary barrier 2b may be provided on the inner surface bent at a predetermined angle, for example, 135 degrees.

[0223] The thickness of each of the outer heat insulating material 3b33 and the inner heat insulating material 3b34 of the inner bent portion 3b3 can be freely set.

[0224] The corner secondary barrier 41b can be set between the corner primary insulation wall 3b and the corner secondary insulation wall 5b. When the corner blocks are adjacent to each other, the adjacent corner secondary barriers 41b between the outer first fixing part and the outer second fixing part 5b1 and 5b2 can be connected by the corner connecting barrier 42b, and can prevent the liquefied gas from leaking to the outside together with the corner primary barrier 2b. The basic structure of the corner secondary barrier 41b of this embodiment can be the same as or similar to that of the aforementioned first embodiment. It should be noted that as the partial structure of the above-mentioned corner primary insulation wall 3b and the corner secondary insulation wall 5b is different from that of the aforementioned first embodiment, the configuration relationship of the corner secondary barrier 41b including the corner connecting barrier 42b of this embodiment may be different. It will be described below when explaining the corner secondary insulation wall 5b.

[0225] The corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. The corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may include an outer first fixing portion 5b1 and an outer second fixing portion 5b2. The inner secondary plywood 51b, the corner secondary insulation member 52b, and the outer secondary plywood 53b are stacked in this order toward the outer side of the corner secondary insulation wall 2b.

[0226] The facing side surfaces of the outer first fixing portion 5b1 and the outer second fixing portion 5b2 can be configured to be inclined in the direction ED that equally divides the corner portion. Although this embodiment describes an evenly divided corner portion, the present invention is not limited thereto. The corner portion can be divided unevenly depending on its position, and thus, the side surfaces can be configured to be inclined in the direction ED that unequally divides the corner portion.

[0227] The outer first fixing portion 5b1 and the outer second fixing portion 5b2 may be formed with steps at corners facing each other.

[0228] Furthermore, the corner secondary insulation wall 5b may include an outer bent portion 5b3, including an insulation member 5b31 inserted between the stepped portion between the outer first fixing portion 5b1 and the outer second fixing portion 5b2. The insulation member 5b32 of the outer bent portion 5b3 may be made of the same material as the outer insulation member 3b33 of the inner bent portion 3b3, such as glass wool.

[0229] By arranging the heat insulating member 5b32 of the outer bending portion 5b3 on the step portion of the outer first fixing portion 5b1 and the outer second fixing portion 5b2, the corner secondary defense wall 41b including the corner connecting defense wall 42b can be fixed to the inner secondary plywood 51b of the outer first fixing portion 5b1, the heat insulating member 5b32 of the outer bending portion 5b3 and the inner secondary plywood 51b of the outer second fixing portion 5b2, and can be configured to be bent at a predetermined angle, for example, 135 degrees, on the inner side of the heat insulating member 5b32 of the outer bending portion 5b3.

[0230] Therefore, in this embodiment, a step is formed at the corners facing each other of the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are respectively fixed to the first surface and the second surface having different angles from each other, and a heat insulating member 5b32 with an outer bent portion 5b3 composed of glass wool is provided on the step portion, and an outer heat insulating member 3b33 with an inner bent portion 5b3 composed of glass wool is provided across the corner secondary defense wall 41b including the corner connecting defense wall 42b. As a result, the flexibility of the corner secondary defense wall 41b including the corner connecting defense wall 42b formed between the glass wool is improved, thereby further preventing damage to the corner secondary defense wall 41b including the corner connecting defense wall 42b.

[0231] Figure 10 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other are shown. The YY-direction stress value is 12.003 MPa, and the temperature is -64.358°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C in the bent portion of the secondary barrier wall of a conventional liquefied gas storage tank, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress, such as the effects of heat and cold from extremely low-temperature materials, than conventional ones.

[0232] Figure 11 1 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a fifth embodiment of the present invention. Figure 12 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a fifth embodiment of the present invention.

[0233] As mentioned above Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment can be composed of a combination of multiple plane blocks, such as Figure 11 As shown, the corner structure of the liquefied gas storage tank 1 can be composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0234] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is similar to that of the reference Figure 1 The aforementioned structure is the same or similar. Figure 1As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0235] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 11 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0236] like Figure 1 as well as Figure 11 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0237] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0238] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0239] like Figure 11 The corner portion of the liquefied gas storage tank 1 of the fifth embodiment of the present invention can be formed by a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below can be an obtuse corner structure forming a predetermined angle, for example, 135 degrees.

[0240] Unlike the accompanying drawings, the position of the corner primary insulation wall 3b can be located in a manner such that the corner secondary barrier 41b constructed on the corner secondary insulation wall 5b is exposed from the center portion of the corner. Therefore, the exposed corner secondary barrier 41b is connected to each other by the corner connecting barrier 42b to complete the construction, or the corner connecting barrier 42b is constructed in a manner such that the corner primary insulation wall 3b connects the adjacently arranged corner secondary barrier 41b, and then is stacked above the secondary barrier 41b / corner connecting barrier 42b. In this embodiment, the corner connecting barrier 42b can be extended to form a length that not only overlaps between the inner first fixing portion and the inner second fixing portion 3b1 and 3b2, but also overlaps at least the inner first fixing portion and the inner second fixing portion 3b1 and 3b2.

[0241] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0242] Corner primary barrier 2b can be positioned at a corner where the first or second surfaces, which have different angles, meet to form a storage space for liquefied gas, a cryogenic substance, and can be constructed of metal. Corner primary barrier 2b, along with corner secondary barrier 41b, can prevent leakage of the liquefied gas.

[0243] The corner primary barrier 2b of this embodiment is basically the same as or similar to the aforementioned first embodiment, so its detailed description is omitted.

[0244] The corner primary insulation wall 3b is designed to block external heat intrusion and withstand external impacts or shocks caused by internal sloshing of liquefied gas. It is located between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary insulation wall 3b of this embodiment is identical or similar to that of the first embodiment, except for the omission of the outer primary clamping plate 33b. This description will focus on the differences.

[0245] The corner primary insulation wall 3b is disposed on the inner sides of the first and second surfaces, respectively, and includes a first inner fixing portion 3b1 and a second inner fixing portion 3b2. The structure is formed by stacking an inner primary clamping plate 31b and a corner primary insulation member 32b in this order, outward from the corner primary insulation wall 2b. The inner primary clamping plate 31b and corner primary insulation member 32b of this embodiment are identical or similar to those of the first embodiment, and thus, detailed descriptions thereof will be omitted to avoid duplication.

[0246] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0247] Furthermore, the corner primary insulation wall 3b may include an inner bent portion 3b3, formed by filling a thermal insulation member 3b35 between an inner first fixing portion 3b1 and an inner second fixing portion 3b2. The thermal insulation member 3b35 of the inner bent portion 3b3 of this embodiment may be the same as or similar to that of the first embodiment described above, and thus, a detailed description thereof will be omitted to avoid duplication.

[0248] The corner secondary barrier 41b can be set between the corner primary insulation wall 3b and the corner secondary insulation wall 5b. When the corner blocks are adjacent to each other, the adjacent corner secondary barriers 41b between the outer first fixing portion and the outer second fixing portion 5b1 and 5b2 can be connected by the corner connecting barrier 42b, and can prevent the liquefied gas from leaking to the outside together with the corner primary barrier 2b. The basic structure of the corner secondary barrier 41b of this embodiment is the same as or similar to that of the aforementioned first embodiment. It should be noted that as the partial structure of the corner secondary insulation wall 5b is different from that of the aforementioned first embodiment, the configuration relationship of the corner secondary barrier 41b including the corner connecting barrier 42b of this embodiment may be different. The following description will be made when explaining the corner secondary insulation wall 5b.

[0249] The corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. The corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may include an outer first fixing portion 5b1 and an outer second fixing portion 5b2. The inner secondary plywood 51b, the corner secondary insulation member 52b, and the outer secondary plywood 53b are stacked in this order toward the outer side of the corner secondary insulation wall 2b.

[0250] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0251] In addition, the corner secondary insulation wall 5b may include: an outer intermediate fixing portion 5b12, which is arranged between the outer first fixing portion 5b1 and the outer second fixing portion 5b2, and the bent portion of the corner secondary defense wall 41b including the corner connecting defense wall 42b is placed on the outer intermediate fixing portion 5b12.

[0252] The outer middle fixing portion 5b12 may include: an outer middle splint 51b12, fixed on the first surface and the second surface respectively; an outer middle heat insulation member 52b12, arranged on the inner side of the outer middle splint 51b12; an inner middle heat insulation member 53b12, arranged on the inner side of the outer middle heat insulation member 52b12, including the bent portion of the corner secondary barrier wall 41b of the corner connecting barrier wall 42b is placed on the inner middle heat insulation member 53b12.

[0253] The outer intermediate plate 51b12 is located on the same line as the inner secondary plate 51b and may have the same structure.

[0254] The outer middle thermal insulation member 52b12 may be polyurethane foam.

[0255] The inner middle heat insulating member 53b12 may be glass wool.

[0256] By arranging an outer middle fixed part 5b12 with stacked outer middle plywood 51b12, outer middle heat insulation member 52b12 and inner middle heat insulation member 53b12 between the outer first fixed part 5b1 and the outer second fixed part 5b2, the corner secondary defense wall 41b including the corner connecting defense wall 42b can be fixed to the inner secondary plywood 51b of the outer first fixed part 5b1, the inner middle heat insulation member 53b12 of the outer middle fixed part 5b12 and the inner secondary plywood 51b of the outer second fixed part 5b2, and bent at a predetermined angle, for example, 135 degrees, on the inner side of the inner middle heat insulation member 53b12 of the outer middle fixed part 5b12.

[0257] Therefore, in this embodiment, an outer intermediate fixing portion 5b12 is arranged between the outer first fixing portion 5b1 and the outer second fixing portion 5b2 which are respectively fixed on the first surface and the second surface having different angles from each other, and the flexibility of the corner secondary defense wall 41b including the corner connecting defense wall 42b is improved, thereby further preventing damage to the corner secondary defense wall 41b including the corner connecting defense wall 42b, wherein the corner connecting defense wall 42b is formed on the upper part of the inner middle heat insulation member 53b12 of the outer intermediate fixing portion 5b12 composed of glass wool.

[0258] In addition, in this embodiment, a predetermined interval is separated between the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are respectively fixed on the first surface and the second surface having different angles from each other, and an outer intermediate fixing portion 5b12 is provided between the outer first fixing portion and the outer second fixing portion 5b1 and 5b2. Thus, by utilizing the gaps formed between the outer first fixing portion 5b1 and the outer intermediate fixing portion 5b12 and between the outer second fixing portion 5b2 and the outer intermediate fixing portion 5b12, the contraction or expansion stress (stress) caused by temperature in the outer fixing portions 5b1, 5b2, 5b12 with two gaps of this embodiment is alleviated compared to the previous outer fixing portion with one gap, thereby preventing damage to the corner secondary barrier 41b including the corner connection barrier 42b fixed on the outer fixing portions 5b1, 5b2, 5b12.

[0259] Figure 12 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion facing the first and second outer fixing portions 5b1 and 5b2 are shown. The YY-direction stress value is 13.101 MPa and the temperature is -74.480°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C in the bent portion of the secondary barrier walls of conventional liquefied gas storage tanks, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress and other effects caused by the cold and heat of extremely low-temperature materials than conventional ones.

[0260] Figure 13 1 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a sixth embodiment of the present invention. Figure 14 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to a sixth embodiment of the present invention.

[0261] As mentioned above Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment is composed of a combination of multiple plane blocks, such as Figure 13 As shown, the corner structure of the liquefied gas storage tank 1 is composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0262] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is similar to that of the reference Figure 1 The aforementioned structure is the same or similar. Figure 1As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0263] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 13 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0264] like Figure 1 as well as Figure 13 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0265] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0266] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0267] like Figure 13 As shown, the corner portion of the liquefied gas storage tank 1 of the sixth embodiment of the present invention can be formed by combining a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below can be an obtuse corner structure forming a predetermined angle, for example, 135 degrees.

[0268] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0269] Corner primary barrier 2b can be positioned at a corner where the first or second surfaces, which have different angles, meet to form a storage space for liquefied gas, a cryogenic substance, and can be constructed of metal. Corner primary barrier 2b, along with corner secondary barrier 41b, can prevent leakage of the liquefied gas.

[0270] The corner primary barrier 2b of this embodiment is basically the same as or similar to the aforementioned first embodiment, so its detailed description is omitted.

[0271] The corner primary insulation wall 3b is designed to block external heat intrusion and withstand external impacts or shocks caused by internal sloshing of liquefied gas. It is located between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary insulation wall 3b of this embodiment is identical or similar to that of the first embodiment, except for the omission of the outer primary clamping plate 33b and the different outer surface shape of the insulation member 3b31 of the inner bent portion 3b3. This description will focus on the different structures.

[0272] The corner primary insulation wall 3b is disposed on the inner sides of the first and second surfaces, respectively, and includes a first inner fixing portion 3b1 and a second inner fixing portion 3b2. The structure is formed by stacking an inner primary clamping plate 31b and a corner primary insulation member 32b in this order, outward from the corner primary insulation wall 2b. The inner primary clamping plate 31b and corner primary insulation member 32b of this embodiment are identical or similar to those of the first embodiment, and thus, detailed descriptions thereof will be omitted to avoid duplication.

[0273] The inner first fixing portion 3b1 may be fixed to the outer first fixing portion 5b1 and disposed on the inner side of the first surface, and the inner second fixing portion 3b2 may be fixed to the outer second fixing portion 5b2 and disposed on the inner side of the second surface.

[0274] Furthermore, the corner primary insulation wall 3b may include an inner bent portion 3b3, formed by filling a thermal insulation member 3b36 between the inner first fixing portion 3b1 and the inner second fixing portion 3b2. The thermal insulation member 3b36 of the inner bent portion 3b3 of this embodiment may be the same or similar to that of the first embodiment described above. It should be noted that the outer surface shape of the thermal insulation member 3b36 of the inner bent portion 3b3 of this embodiment may vary depending on the structure of the outer first fixing portion 5b1 and the outer second fixing portion 5b2.

[0275] That is, the heat insulating member 3b36 of the inner bending portion 3b3 of this embodiment forms a chamber at the corner where the outer first fixing portion 5b1 and the outer second fixing portion 5b2 face each other, thereby having a shape whose outer surface is more convex toward the outside than the inner first fixing portion 3b1 or the inner second fixing portion 3b2.

[0276] Corner secondary barrier 41b can be disposed between corner primary insulation wall 3b and corner secondary insulation wall 5b. When the corner blocks are adjacently arranged, adjacent corner secondary barrier 41b between the outer first and second fixing portions 5b1 and 5b2 can be connected by corner connecting barrier 42b, thereby preventing liquefied gas from leaking to the outside, together with corner primary barrier 2b. In this embodiment, corner connecting barrier 42b can be extended to a length that not only overlaps between the inner first and second fixing portions 3b1 and 3b2, but also overlaps at least the inner first and second fixing portions 3b1 and 3b2.

[0277] The basic structure of the corner secondary barrier 41b of this embodiment is the same as or similar to that of the aforementioned first embodiment. It should be noted that, as the structure of some corner secondary insulation walls 5b differs from that of the aforementioned first embodiment, the configuration of the corner secondary barrier 41b of this embodiment, including the corner connecting barrier 42b, may differ. This will be further described below when describing the corner secondary insulation walls 5b.

[0278] The corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. The corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may include an outer first fixing portion 5b1 and an outer second fixing portion 5b2. The inner secondary plywood 51b, the corner secondary insulation member 52b, and the outer secondary plywood 53b are stacked in this order toward the outer side of the corner secondary insulation wall 2b.

[0279] The facing side surfaces of the outer first fixing portion 5b1 and the outer second fixing portion 5b2 can be configured to be inclined in the direction ED that equally divides the corner portion. Although this embodiment describes an evenly divided corner portion, the present invention is not limited thereto. The corner portion can be divided unevenly depending on its position, and thus, the side surfaces can be configured to be inclined in the direction ED that unequally divides the corner portion.

[0280] The outer first fixing portion 5 b 1 and the outer second fixing portion 5 b 2 may form cavities at corners facing each other.

[0281] In this embodiment, the inner secondary plate 51b can include: a peripheral plate 51b1, parallel to the outer secondary plate 53b and fixed to the corner secondary insulation 52b; and an inclined plate 51b2, connected to the peripheral plate 51b1 and fixed to the corner secondary insulation 52b in the chamber portion. Thus, unlike the first embodiment, the corner primary insulation 32b can be installed on the peripheral plate 51b1, and the insulation 3b36 of the inner bent portion 3b3 can be installed on the inclined plate 51b2.

[0282] By arranging the inclined splint 51b2 in the cavity part of the outer first fixing part 5b1 and the outer second fixing part 5b2 and the heat insulation part 3b36 of the inner bending part 3b3, the corner secondary defense wall 41b including the corner connecting defense wall 42b can be fixed to the peripheral splint 51b1 of the outer first fixing part 5b1, the inclined splint 5b2 of the outer first fixing part 5b1, the inclined splint 5b2 of the outer second fixing part 5b2 and the peripheral splint 51b1 of the outer second fixing part 5b2.

[0283] In addition, the corner secondary prevention wall 41b including the corner connection prevention wall 42b may be bent in a manner of convexly extending outward, thereby being positioned in the cavity portion of the outer first fixing portion 5b1 and the outer second fixing portion 5b2.

[0284] That is, the corner secondary defense wall 41b including the corner connecting defense wall 42b can be configured to bend outward between the peripheral clamping plate 51b1 of the outer first fixing part 5b1 and the inclined clamping plate 51b2 of the outer first fixing part 5b1, bend inward between the inclined clamping plate 51b2 of the outer first fixing part 5b1 and the inclined clamping plate 51b2 of the outer second fixing part 5b2, and bend outward between the inclined clamping plate 51b2 of the outer second fixing part 5b2 and the peripheral clamping plate 51b1 of the outer second fixing part 5b2.

[0285] Therefore, in this embodiment, a cavity is formed at the corners facing the outer first fixing part 5b1 and the outer second fixing part 5b2, which are respectively fixed on the first surface and the second surface having different angles from each other, and a corner secondary barrier 41b including a corner connecting barrier 42b is arranged along the surface of the outer first fixing part, the outer second fixing part 5b1, and the outer second fixing part 5b2 including the cavity part. Thus, the corner secondary barrier 41b including the corner connecting barrier 42b is convex and bent outward, so that the length of the part not bonded to the corner secondary insulation wall 5b is increased, and not only can the damage probability of the corner secondary barrier 41b including the corner connecting barrier 42b be further reduced by increasing the flexibility of the corner secondary barrier 41b including the corner connecting barrier 42b, but also the absorption of hull deformation of the corner secondary barrier 41b including the corner connecting barrier 42b becomes easier, and low-temperature stress can also be further reduced.

[0286] Figure 14 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other are shown. The YY-direction stress value is 7.197 MPa and the temperature is -53.710°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C at the bent portion of the secondary barrier wall of a conventional liquefied gas storage tank, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress and other effects caused by the cold and heat of extremely low-temperature materials than in conventional embodiments.

[0287] Figure 15 FIG. 1 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a seventh embodiment of the present invention. Figure 16 It is a diagram showing the results of structural analysis of a corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention.

[0288] like Figure 15 Compared with the liquefied gas storage tank 1 of the aforementioned first embodiment, the liquefied gas storage tank 1 of this embodiment may have the same or similar structures except for the structure of the inner bending portion 3b3. Therefore, for the same structure, the specific description is omitted to avoid repeated description, and the description is mainly based on the different structure.

[0289] The structure of the corner primary insulation wall 3b of this embodiment is the same or similar to that of the aforementioned first embodiment, except for the structure of the inner bending portion 3b3 formed by the filling insulation member 3b31. Here, the different structure is mainly described.

[0290] The corner primary insulation wall 3b of this embodiment may include: a vacuum insulation panel 3b37, and an inner bending portion 3b3 filling the inner first fixing portion 3b1 and the inner second fixing portion 3b2.

[0291] In this embodiment, the first inner fixing portion 3b1 and the second inner fixing portion 3b2 are non-structural components. Therefore, the vacuum insulation panel 3b37, which serves as a structural component, can be easily installed between the first inner fixing portion 3b1 and the second inner fixing portion 3b2. The vacuum insulation panel 3b37 has excellent thermal insulation performance among various insulation materials such as polyurethane foam, thereby improving the thermal insulation performance in corners.

[0292] Figure 16 The results of a structural analysis of the YY-direction stress and temperature distribution of the secondary barrier walls 4, 41b, and 42b at the bent portion where the first and second outer fixing portions 5b1 and 5b2 face each other are shown. The YY-direction stress value is 12.084 MPa, and the temperature is -59.025°C. Compared to the YY-direction stress value of approximately 66.8984 MPa and the temperature of approximately -135.857°C at the bent portion of the secondary barrier wall of a conventional liquefied gas storage tank, these values ​​indicate that the stress on the secondary barrier walls 4, 41b, and 42b of this embodiment is significantly less, indicating that the secondary barrier walls 4, 41b, and 42b of this embodiment are less susceptible to damage from cryogenic stress, such as the effects of heat and cold from extremely low-temperature materials, than conventional ones.

[0293] Figure 17 It is a partial front view of a corner portion of a liquefied gas storage tank for explaining an eighth embodiment of the present invention.

[0294] As mentioned above Figure 1 As shown, the plane structure of the liquefied gas storage tank 1 of this embodiment is composed of a combination of multiple plane blocks, such as Figure 17 As shown, the corner structure of the liquefied gas storage tank 1 is composed of a plurality of corner blocks. Such a plurality of planar blocks can be connected to the plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0295] In the liquefied gas storage tank 1 of this embodiment, the structure of the plane block is similar to that of the reference Figure 1 The aforementioned structure is the same or similar. Figure 1 As shown, the planar block of the liquefied gas storage tank 1 of this embodiment is arranged in a flat portion of the first surface or the second surface having different angles from each other, which forms a storage space for accommodating liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary defense wall 2a made of a fixed metal material, and arranged on the outside of the flat primary defense wall 2a; a flat secondary defense wall 41a, which is arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, which is arranged on the outside of the flat secondary defense wall 41a.

[0296] Therefore, in order to avoid repeated description, the detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. Figure 1 as well as Figure 17 , the structure of the corner block of the liquefied gas storage tank 1 of this embodiment is mainly described in detail.

[0297] like Figure 1 as well as Figure 17 The liquefied gas storage tank 1 may include: a primary barrier 2 in contact with the liquefied gas; a primary insulation wall 3 disposed outside the primary barrier 2; a secondary barrier 4 disposed outside the primary insulation wall 3; and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 using an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0298] Among them, the primary barrier 2 can be composed of a flat primary barrier 2a of a plane block and a corner primary barrier 2b of a corner block, the primary insulation wall 3 can be composed of a flat primary insulation wall 3a of a plane block and a corner primary insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a plane block and a corner secondary barrier 41b of a corner block, and the secondary insulation wall 5 can be composed of a flat secondary insulation wall 5a of a plane block and a corner secondary insulation wall 5b of a corner block. In the case of this embodiment, as described in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 in the plane block and the corner block can be the same or similar.

[0299] Among them, the secondary defense walls 4 of the plane blocks and corner blocks can include flat connecting defense walls 42a or corner connecting defense walls 42b. When multiple plane blocks or multiple corner blocks are adjacently arranged, the flat connecting defense walls 42a connect the adjacently arranged flat secondary defense walls 41a, and the corner connecting defense walls 42b connect the adjacently arranged corner secondary defense walls 41b.

[0300] like Figure 17 As shown, the corner portion of the liquefied gas storage tank 1 according to the eighth embodiment of the present invention can be constructed by combining a plurality of corner blocks.

[0301] The corner block of the liquefied gas storage tank 1 is arranged at the corner part where the first surface and the second surface with different angles meet to form a storage space for accommodating liquefied gas, and may include: a corner primary insulation wall 3b, a corner primary defense wall 2b made of a fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, set on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b.

[0302] The primary corner barrier 2b is positioned at the corner where the first or second surfaces, which have different angles, meet, forming a storage space for liquefied gas, a cryogenic substance. It is constructed of metal. Together with the secondary corner barrier 41b, the primary corner barrier 2b prevents leakage of the liquefied gas. The primary corner barrier 2b of this embodiment is substantially the same or similar to that of the first embodiment, and therefore a detailed description thereof is omitted.

[0303] The corner primary barrier 2b can be fixed to the barrier fixing member 21b.

[0304] The wall-preventing fixing member 21b can be made of metal and can be installed on the upper part of the corner primary insulation wall 3b. In the case of the corner primary insulation wall 3b, a plurality of them can be arranged along the edge of the corner portion of the corner secondary insulation wall 5b, thereby allowing the wall-preventing fixing member 21b to be independently installed in each of the plurality of corner primary insulation walls 3b.

[0305] The corner primary insulation wall 3b is designed to block heat intrusion from the outside and to withstand external impact or impact caused by internal sloshing of liquefied gas, and is provided between the corner primary barrier 2b and the corner secondary barrier 41b.

[0306] The corner primary insulation wall 3b is respectively arranged on the inner side of the first surface and the second surface, and may include: a corner primary insulation part 32b, fixed on the corner secondary defense wall 41b; an inner primary splint 31b, arranged on the inner side of the corner primary insulation part 32b, forming a step with the corner primary insulation part 32b, and fixing the corner primary defense wall 2b.

[0307] A plurality of corner primary heat insulating walls 3b in which the inner primary clamping plates 31b and the corner primary heat insulating members 32b are stacked in this order may be arranged along the sides of the corner portions of the corner secondary heat insulating walls 5b.

[0308] In this embodiment, although the corner primary insulation wall 3b is described as being composed of the inner primary splint 31b and the corner primary insulation member 32b, it may also be the same as or similar to the corner primary insulation wall 3b of at least one of the aforementioned first to seventh embodiments.

[0309] The above-mentioned multiple corner primary insulation walls 3b are arranged adjacent to each other on the corner secondary insulation wall 5b, and the intervals between the multiple corner primary insulation walls 3b can be minimized to omit the filling of additional insulation members such as glass wool between the multiple corner primary insulation walls 3b.

[0310] As described above, when multiple corner primary insulation walls 3b are arranged, a stepped space is created between the corner primary insulation member 32b and the inner primary clamping plate 31b that forms a step therewith. The corner block of this embodiment includes an inner first filler 3b4 that fills the stepped space between adjacent corner primary insulation walls 3b, and the corner primary barrier 2b is positioned within this inner first filler 3b4.

[0311] The inner first filling member 3b4 may be polyurethane foam or glass wool.

[0312] The plurality of corner primary insulation walls 3b, together with the corner secondary insulation walls 41b and the corner secondary insulation walls 5b, constitute a portion of a corner block. The overall width of the plurality of corner primary insulation walls 3b constituting the corner block can be smaller than the width of the corner secondary insulation walls 5b constituting the other components of the corner block. Thus, a portion of the corner secondary insulation walls 41b can be exposed to the outermost sides of the plurality of corner primary insulation walls 3b. When the plurality of corner blocks are arranged adjacently along the edges of the corner portion, the space between the outermost corner primary insulation walls 3b adjacently arranged, i.e., the space where the corner secondary insulation walls 41b are exposed, can be provided with a corner connecting insulation wall 34b.

[0313] The corner connecting insulation wall 34b is arranged between the outermost corner primary insulation walls 3b adjacent to each other when the corner blocks are arranged adjacent to each other. It can be configured as a stacked form of corner connecting insulation pieces 341b and corner connecting clamps 342b that are the same or similar to the corner primary insulation wall 3b, and has the same or similar thickness as the corner primary insulation wall 3b.

[0314] Such a corner connecting insulation wall 34b is configured to seal the space portion generated between the adjacent corner secondary insulation walls 5b together with the corner connecting barrier 42b when multiple corner blocks are adjacently arranged along the edge of the corner portion, thereby performing the function of blocking heat intrusion from the outside.

[0315] As described above, when multiple corner blocks are arranged adjacent to each other along the corner portion, a space will be generated between the corner connecting insulation member 341b and the corner primary insulation member 32b and between the corner connecting plywood 342b and the inner primary plywood 31b. The space can be filled with the inner second filling member 3b5 in which the corner primary barrier 2b is installed to complete the construction of the corner primary insulation wall 3b.

[0316] The inner second filling member 3b5 may be polyurethane foam or glass wool.

[0317] The corner secondary barrier 41b may be provided between the corner primary insulation wall 3b and the corner secondary insulation wall 5b, and together with the corner primary insulation wall 2b, may prevent the liquefied gas from leaking to the outside.

[0318] The corner secondary barrier 41b is a part of a corner block together with the corner primary insulation wall 3b and the corner secondary insulation wall 5b. When the corner blocks are adjacent to each other, the adjacent corner secondary barrier 41b can be sealed and connected by the corner connecting barrier 42b.

[0319] The corner connecting barrier 42b can connect the adjacent corner secondary barrier 41b exposed to the outside when the corner blocks are adjacently arranged, and a corner connecting heat insulating wall 34b can be provided on the upper part.

[0320] Corner secondary insulation wall 5b may include an inner secondary plywood 51b, a corner secondary insulation member 52b, and an outer secondary plywood 53b. Corner secondary insulation wall 5b is fixed to the inner sides of the first and second surfaces, respectively, and may be formed by stacking inner secondary plywood 51b, corner secondary insulation member 52b, and outer secondary plywood 53b in sequence toward the outside of corner secondary barrier 2b.

[0321] When a plurality of corner blocks are arranged adjacent to each other along the side of the corner portion, the space generated between the adjacently arranged corner secondary heat-insulating walls 5b can be filled with the outer filling member 5b4.

[0322] The outer filling member 5b4 may be polyurethane foam or glass wool.

[0323] The corner secondary heat insulating wall 5b of this embodiment may be the same as or similar to the corner secondary heat insulating wall 5b of at least one of the first to seventh embodiments. Here, the detailed description is omitted to avoid repetition.

[0324] Therefore, in this embodiment, a plurality of corner primary insulation walls 3b including inner primary splints 31b forming steps with the corner primary insulation pieces 32b are arranged on the corner secondary insulation wall 5b, and adjacent corner primary insulation pieces 32b are arranged adjacent to each other. Therefore, not only can the setting operation of the anti-wall fixing member 21b be easily performed through the step portion between the adjacently arranged inner primary splints 31b, but also the filling piece 3b4 only needs to be placed on the step portion, thereby reducing the consumption of the filling piece.

[0325] Figure 18 FIG. 1 is a partial front view of a corner portion of a liquefied gas storage tank for explaining a ninth embodiment of the present invention. Figure 19 Is used to illustrate Figure 18 A perspective view of the upper block, Figure 20 Is used to illustrate Figure 18 A perspective view of the upper connecting block, Figure 21 yes Figure 19 An exploded perspective view of the upper block, Figure 22 yes Figure 19 A cross-sectional view of the upper block, Figure 23 It shows Figure 19A cross-sectional view of another embodiment of the upper block, Figure 24 Is used to illustrate Figure 18 A three-dimensional image of the filling piece, Figure 25 Is used to illustrate Figure 18 Figure 1 shows the anti-sticking member applicable to the upper connecting block of Figure 26 Is used to illustrate Figure 18 FIG. 2 is a diagram of another embodiment of an anti-sticking member suitable for use in an upper connecting block of FIG.

[0326] also, Figure 27 (a) and (b) are used to illustrate Figure 18 FIG. 1 shows another embodiment of an upper block and an upper connecting block, Figure 28 Yes Figure 27 Partially enlarged front view of the applicable upper block and the corner portion of the upper connecting block, Figure 29 (a) and (b) are used to illustrate Figure 18 FIG. 1 is a diagram of another embodiment of an upper block and an upper connecting block, Figure 30 Yes Figure 29 Partially enlarged front view of the applicable upper block and the corner portion of the upper connecting block.

[0327] also, Figure 31 (a) and (b) are diagrams showing the results of structural analysis of the wall-preventing fixing member of the present embodiment without a reinforcement and the wall-preventing fixing member of the comparative example with a reinforcement, respectively. Figure 32 (a) and (b) are diagrams showing the results of structural analysis of the structures (snipple) provided on the lower sides of the wall-preventing fixing member of the present embodiment without reinforcement and the wall-preventing fixing member of the comparative example with reinforcement.

[0328] like Figure 18 As shown, the corner portion of the liquefied gas storage tank 100 according to the ninth embodiment of the present invention can be constructed by combining a plurality of corner blocks CB. The primary structure of the corner block CB can include a lower block LB fixed to the hull 7 and constructed from a single board; a plurality of upper blocks UB bonded to the lower block LB; and an upper connecting block UBB connecting adjacent lower blocks LB.

[0329] As in the aforementioned first to eighth embodiments, the corner block CB of this embodiment can be arranged at a corner portion where a first surface and a second surface having different angles from each other meet, forming a storage space for accommodating liquefied gas. Although not shown in the figure, in a state where the corner block CB is arranged, as described above, a corner primary barrier 2b made of a metal material is formed on the upper block UB and the upper connecting block UBB, thereby completing a corner portion of the liquefied gas storage tank 100 having a storage space for hermetically accommodating liquefied gas as an extremely low-temperature substance.

[0330] The liquefied gas storage tank 100 of this embodiment can be completed by connecting the corner block CB formed on the corner portion and the plane block formed on the flat portion, wherein the plane block can be the aforementioned first embodiment. Figure 1 The plane block shown or the tenth embodiment described later Figure 33 Planar block FB is shown, but not limited to this.

[0331] In addition, the corner block CB of this embodiment is divided into a lower block LB, an upper block UB, and an upper connecting block UBB for detailed description below, but is not limited thereto and may be the same or similar to at least one structure in the aforementioned first to eighth embodiments.

[0332] like Figure 18 As shown, the lower block LB may include: a corner secondary defense wall 41b, a corner connecting defense wall 42b and a corner secondary thermal insulation wall 5b, wherein a plurality of upper blocks UB and an upper connecting block UBB may be provided on the upper surface of the corner secondary defense wall 41b, and the corner secondary defense wall 41b is bonded to the lower surface of the upper block UB, the corner connecting defense wall 42b connects the adjacent corner secondary defense walls 41b exposed to the outside due to the absence of the upper block UB when the lower block LB is adjacently configured, and the corner connecting defense wall 42b is bonded to the lower surface of the upper connecting block UBB, and the corner secondary thermal insulation wall 5b includes an inner secondary plywood 51b, a corner secondary thermal insulation component 52b and an outer secondary plywood 53b.

[0333] The lower block LB of this embodiment may have the same or similar structure as at least one of the first to eighth embodiments described above, and the detailed description is omitted here to avoid repeated description.

[0334] A plurality of upper blocks UB may be bonded to the lower block LB.

[0335] like Figure 18 、 Figure 19 、 Figure 21As shown, the plurality of upper blocks UB each have a basic structure consisting of a corner primary barrier 2b made of a metal material, a barrier fixing member 21b disposed on the outside of the corner primary barrier 2b, and a corner primary heat insulating wall 3b disposed on the outside of the barrier fixing member 21b. The corner primary heat insulating wall 3b may further include an inner bent portion 3b3.

[0336] As described above, the upper blocks UB having the basic structure can be arranged side by side with a predetermined gap between them and bonded to the lower block LB. In this embodiment, as shown in FIG. Figure 18 As shown, there may be five upper blocks UB arranged side by side with a predetermined gap therebetween, but the present invention is not limited thereto.

[0337] The wall-preventing fixing member 21b, made of metal, can be installed on the upper portion of the corner primary insulation wall 3b and bent at a predetermined angle inside the first and second surfaces. For example, the angle is the same as the angle formed by the first and second surfaces, which have different angles and form the storage space for liquefied gas. In the case of the corner primary insulation wall 3b, a plurality of wall-preventing fixing members 21b can be arranged along the sides of the corner portions forming a right angle or an obtuse angle on the corner secondary insulation wall 5b constituting the lower block LB. Thus, the wall-preventing fixing member 21b is bent at a right angle or an obtuse angle and independently installed on the upper portion of each of the plurality of corner primary insulation walls 3b.

[0338] The wall-preventing fixing member 21b can be installed on the upper portion of the corner primary insulation wall 3b using a plurality of coupling members 21b1 provided on the back surface. The coupling members 21b1 can be composed of stud bolts and nuts.

[0339] like Figure 21 As shown, the wall-preventing fixing member 21b of this embodiment is not provided with a reinforcing member on the back side for supporting the upper portion of the corner primary heat-insulating wall 3b.

[0340] Generally speaking, the reinforcing member supporting the upper portion of the corner primary insulation wall 3b can be as follows: Figure 31 The reinforcement member 122b shown in (b) is a general wall-preventing fixing member 121b. The reinforcement member 122b is provided along the edge of the back side as a reinforcing member. Such a reinforcement member 122b has the concept of firmly fixing the upper block UB.

[0341] However, the general wall-protecting fixing member 121b equipped with the reinforcement 122b has a problem in that the portion bent at a right angle or an obtuse angle is fragile when external forces such as movement due to hull movement or thermal load are applied.

[0342] In this regard, in order to solve such a problem, the anti-wall fixing component 21b of this embodiment is not equipped with a reinforcing component such as a reinforcement 122b on the back, but is combined to the upper surface of the corner primary insulation wall 3b in a plane-to-plane manner, and such a structure has also been confirmed by the structural analysis results.

[0343] Figure 31 (a) is a diagram showing the structural analysis results of the wall-fixing member 21b of the liquefied gas storage tank 100 of this embodiment, which is not equipped with the reinforcement member 122b, when external forces such as motion caused by hull motion or thermal load are applied. Figure 31 (b) is a diagram showing the structural analysis results of a general wall-fixing member 121b equipped with a reinforcement 122b in a comparative example liquefied gas storage tank (100a) when external forces such as movement or thermal load caused by hull movement are applied. By comparing the structural analysis results, it can be confirmed that when the reinforcement 122b is not equipped (this embodiment), it can cope with external forces flexibly, thereby evenly distributing the burden on the portion bent at a right angle or an obtuse angle, compared with the case where the reinforcement 122b is equipped (comparative example).

[0344] Figure 32 (a) is a diagram showing the structural analysis results of the structure (clamping plate) provided below the wall-protecting fixing member 21b not equipped with the reinforcement 122b in the liquefied gas storage tank 100 of this embodiment when external forces such as motion due to hull motion or thermal load are applied. Figure 32 (b) is a diagram showing the structural analysis results of the structure (splint) provided on the lower side of the general wall-fixing member 121b equipped with the reinforcement 122b in the comparative example liquefied gas storage tank (100a) when external forces such as movement or thermal load caused by the movement of the hull are applied. By comparing the structural analysis results, it can be confirmed that since the load is evenly distributed on the part bent at a right angle or an obtuse angle, the degree of bending of the bent part will also be reduced, and therefore, the pressure acting on the structure connected to the lower side will also be evenly distributed at a low value.

[0345] Therefore, in this embodiment, no reinforcing member such as the reinforcement 122b is provided on the back of the anti-wall fixing member 21b, so the weight of the anti-wall fixing member 21b itself can be reduced, and welding for fitting the reinforcing member is not performed, so the welding time can be reduced and the accuracy can be improved during manufacturing. Moreover, as the burden generated at the part bent at a right angle or an obtuse angle is evenly distributed, compared with the general anti-wall fixing member 121b equipped with the reinforcement 122b in the past, the frequency of damage in the bent part is reduced, and the repair is minimized, which can improve the stability of the system.

[0346] The corner primary insulation wall 3b is designed to block heat intrusion from the outside and to withstand external impact or impact caused by internal sloshing of liquefied gas, and is arranged between the wall fixing member 21b and the corner secondary insulation wall 41b of the lower block LB.

[0347] The corner primary insulation wall 3b is respectively arranged on the inner side of the first surface and the second surface, and may include an inner first fixing part 3b1 and an inner second fixing part 3b2 composed of a structure in which an inner primary plywood 31b, a corner primary insulation part 32b, and an outer primary plywood 33b are stacked in sequence toward the outside of the anti-wall fixing member 21b.

[0348] In addition, the corner primary heat insulating wall 3b may include an inner bending portion 3b3, and a space between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 is formed by a heat insulating member.

[0349] The corner primary heat-insulating wall 3 b of this embodiment may be the same as or similar to the corner primary heat-insulating wall 3 b of the aforementioned first embodiment, and detailed description thereof will be omitted to avoid repetition.

[0350] In the upper block UB described above, the inner primary clamping plate 31b is disposed on the inner upper surface of the corner primary insulation member 32b, forming a step with the corner primary insulation member 32b. Thus, when the upper blocks UB having the basic structure are arranged side by side with a predetermined gap therebetween, adjacent corner primary insulation members 32b are positioned adjacent to each other, creating a step space between adjacent inner primary clamping plates 31b. Additional insulation can be omitted between adjacent corner primary insulation members 32b. While this embodiment describes omitting insulation between the corner primary insulation members 32b, insulation can also be installed between the corner primary insulation members 32b.

[0351] like Figure 24 As shown, a stuffing piece (10) is inserted into the stepped space formed between the adjacent inner primary clamping plates 31b. The details of the stuffing piece 10 will be described later.

[0352] The upper connecting blocks UBB may be bonded to upper surfaces of adjacent lower blocks LB, thereby connecting the lower blocks LB.

[0353] like Figure 18 、 Figure 20 As shown, the upper connecting block UBB may include: a wall fixing member 21b, which fixes the metal corner primary wall 2b and is arranged outside the corner primary wall 2b; and a corner connecting heat insulating wall 34b, which is arranged outside the wall fixing member 21b. The corner connecting heat insulating wall 34b may also include a corner connecting bent portion 34b3.

[0354] The wall-preventing fixing member 21 b of the upper connecting block UBB may be the same as or similar to the wall-preventing fixing member 21 b of the aforementioned upper block UB, and a detailed description thereof will be omitted here to avoid duplication.

[0355] The corner connection insulation wall 34b of the upper connection block UBB can be designed to block heat intrusion from the outside together with the corner primary insulation wall 3b and be able to withstand impact from the outside or impact caused by liquefied gas shaking inside, and is arranged between the wall fixing member 21b and the corner connection wall 42b of the lower block LB.

[0356] Such a corner connecting heat-insulating wall 34b is respectively arranged on the inner side of the first surface and the second surface, and may include: a first corner connecting fixing part 34b1 and a second corner connecting fixing part 34b2, which is composed of a structure in which a first corner connecting clamp 342b, a corner connecting heat-insulating part 341b, and a second corner connecting clamp 343b are stacked in sequence toward the outside of the anti-wall fixing component 21b.

[0357] In addition, the corner connecting heat insulating wall 34b may include a corner connecting bent portion 34b3, and the space between the first corner connecting and fixing portion 34b1 and the second corner connecting and fixing portion 34b2 may be formed of a heat insulating member. The corner connecting bent portion 34b3 may be formed of the same or similar material as the inner bent portion 3b3, such as low-density polyurethane foam or glass wool.

[0358] In this embodiment, the corner connecting insulation wall 34b is different from the aforementioned corner primary insulation wall 3b only in the figure mark, but can be the same or similar in structure. Here, in order to avoid repeated description, the detailed description is omitted.

[0359] In the upper connecting block UBB constructed as described above, the corner first connecting plates 342b are located on the inner upper surface of the corner connecting thermal insulators 34b, forming a step with the corner connecting thermal insulators 34b. Consequently, when the upper connecting block UBB is positioned at the connection point of the lower block LB to connect the adjacent lower block LB, the corner connecting thermal insulators 341b of the upper connecting block UBB and the corner primary thermal insulators 32b of the upper block UB are positioned adjacent to each other, creating a step between the corner first connecting plates 342b of the upper connecting block UBB and the inner primary thermal insulators 31b of the upper block UB. This eliminates the need for additional thermal insulation between the adjacent corner primary thermal insulators 32b and corner connecting thermal insulators 341b of the upper connecting block UBB. Although this embodiment describes the case where the filling insulation is omitted between the corner primary insulation 32b of the upper block UB and the corner connecting insulation 341b of the upper connecting block UBB, insulation can also be constructed between the corner primary insulation 32b of the upper block UB and the corner connecting insulation 341b of the upper connecting block UBB.

[0360] like Figure 24 As shown, a stuffing piece (10) is inserted into the step space generated between the corner first connecting clamping plate 342b and the inner primary clamping plate 31b.

[0361] like Figure 18 as well as Figure 24 As shown, the filling piece 10 is not only inserted into the first step space generated between the inner primary clamping plates 31b of adjacent upper blocks UB, but also inserted into the second step space generated between the inner primary clamping plate 31b of the upper block UB and the corner first connecting clamping plate 342b of the upper connecting block UBB. As a result, not only the gap interval between adjacent upper blocks UB and the gap interval between the upper block UB and the upper connecting block UBB can be maintained constant, but also the inner bent portion 3b3 of the upper block UB and the corner connecting bent portion 34b3 of the upper connecting block UBB can be fixed, and it can also be easily operated when the upper block UB is operated.

[0362] If the inner bent portion 3b3 or the corner connecting bent portion 34b3 is not fixed, a predetermined gap cannot be maintained between adjacent upper blocks UB or between an upper block UB and an upper connecting block UBB, and deviation may occur.

[0363] Thus, like the general anti-wall fixing member 121b mentioned above, when a reinforcement 122b is provided along the edge of the back side, the reinforcement 122b can fix the inner bending portion 3b3 or the corner connecting bending portion 34b3. However, in the case of the anti-wall fixing member 21b of this embodiment, since the reinforcement 122b is not provided, an additional fixing unit is required to fix the inner bending portion 3b3 or the corner connecting bending portion 34b3, and the filling piece 10 will serve as the fixing unit.

[0364] Such a filling piece 10 can be formed of the same or similar material as the inner bending portion 3b3 or the corner connecting bending portion 34b3, such as low-density polyurethane foam. The filling piece 10 may include: a main body 11, having a shape corresponding to the first and second step spaces; an end portion 12, after the main body 11 is inserted into the first and second step spaces, the end portion 12 is embedded in the inner bending portion 3b3 or the corner connecting bending portion 34b3.

[0365] The end portion 12 may be formed into a wedge shape so as to be easily embedded in the inner bending portion 3b3 or the corner connecting bending portion 34b3.

[0366] Furthermore, an adhesive (not shown) may be applied to the end portion 12 to stably fix the inner bent portion 3b3 or the corner connecting bent portion 34b3.

[0367] Reference Figure 21 as well as Figure 22 , illustrating the assembly process of the upper block UB as described above.

[0368] During an assembly process, the outer primary plywood 33b having a plurality of first holes 81 is bonded to the outer side surface of the corner primary thermal insulation member 32b having a plurality of second holes 82, and the inner primary plywood 31b having a plurality of third holes 83 is bonded to the inner side surface of the corner primary thermal insulation member 32b having a plurality of second holes 82.

[0369] The first, second, and third holes 81, 82, and 83 can be formed on extensions of positions corresponding to the plurality of coupling members 21b1 provided on the wall-protection fixing member 21b. The first and second holes 81 and 82 have the same size and are interconnected by the bonding of the outer primary clamping plate 33b and the corner primary thermal insulation member 32b. These interconnected holes can be sealed by inserting a form plug 9. The third hole 83 can be sized to accommodate the insertion of the coupling member 21b1.

[0370] During the secondary assembly process, when the outer primary splint 33b, the corner primary insulation member 32b, and the inner primary splint 31b are bonded together, the anti-wall fixing member 21b is tightly attached to the upper surface of the inner primary splint 31b by inserting a plurality of coupling members 21b1 into a plurality of third holes 83 formed on the inner primary splint 31b.

[0371] During the three-stage assembly process, the coupling member 21 b 1 is fastened with bolts through the communicating hole formed by the plurality of first and second holes 81 and 82 , so that the wall-preventing fixing member 21 b is fixed to the upper surface of the inner primary clamping plate 31 b .

[0372] During the fourth assembly process, while the wall-preventing fixing member 21b is fixed to the inner primary clamping plate 31b, the molded plug 9 is inserted into the connecting hole formed by the plurality of first and second holes 81 and 82. The molded plug 9 has a size corresponding to the connecting hole and can be made of the same or similar material as the corner primary thermal insulation member 32b.

[0373] Then, the inner bending portion 3b3 is inserted into the space between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 formed by the structure in which the outer primary splint 33b, the corner primary insulation member 32b, and the inner primary splint 31b are bonded together, thereby completing the assembly process of the upper block UB.

[0374] As described above, the upper block UB of this embodiment has a structure that can realize the following assembly process: first, the outer primary clamping plate 33b having a plurality of first holes 81, the corner primary thermal insulation member 32b having a plurality of second holes 82, and the inner primary clamping plate 31b having a plurality of third holes 83 are bonded together, and then the anti-wall fixing member 21b is bolted.

[0375] Although the assembly process of the upper block UB is described, the upper connecting block UBB having the same or similar structure as the upper block UB can also be assembled using the same or similar assembly process. Therefore, in this embodiment, the structure of the upper block UB can be used to include the structure of the upper connecting block UBB.

[0376] The upper block UB of the present embodiment has a structure in which a plurality of first holes 81 are formed in the outer primary clamping plate 33b and a plurality of second holes 82 are formed in the corner primary heat insulating member 32b. However, the first and second holes 81 and 82 formed in the outer primary clamping plate 33b and the corner primary heat insulating member 32b may be removed. Figure 23 Provide explanation.

[0377] like Figure 23As shown, the upper block UB of another embodiment may have a structure in which the first and second holes 81 and 82 are omitted in the outer primary clamping plate 33b and the corner primary thermal insulation member 32b, respectively.

[0378] In this case, the assembly process of the upper block UB according to another embodiment may be different, which will be described below.

[0379] During an assembly process, the anti-wall fixing member 21b is tightly attached to the upper surface of the inner primary clamping plate 31b by inserting a plurality of connecting members 21b1 into a plurality of third holes 83 formed on the inner primary clamping plate 31b, and the connecting members 21b1 are bolted to tighten the anti-wall fixing member 21b, so that the anti-wall fixing member 21b is fixed to the upper surface of the inner primary clamping plate 31b.

[0380] During the secondary assembly process, the corner primary heat insulating member 32b is bonded to the outer side surface of the inner primary clamping plate 31b, and the outer primary clamping plate 33b is bonded to the outer side surface of the corner primary heat insulating member 32b.

[0381] Then, the inner bending portion 3b3 is inserted into the space between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 formed by the structure bonded together by the outer primary splint 33b, the corner primary insulation member 32b, and the inner primary splint 31b to complete the assembly process of the upper block UB.

[0382] In the upper block UB of another embodiment assembled as described above, the additional steps of constructing the first and second holes 81 and 82 in the outer primary splint 33b and the corner primary thermal insulation member 32b and inserting the molded plug 9 can be omitted, and the first and second holes 81 and 82 can be removed, which is not only beneficial to the maintenance of thermal insulation but also increases the strength. Furthermore, when the upper block UB of another embodiment is bonded to the lower block LB, the glue lost due to the first and second holes 81 and 82 can be filled in the gluing process at the lower part of the upper block UB of another embodiment, which is also beneficial to the bonding strength.

[0383] When a plurality of upper blocks UB are bonded to the upper surfaces of the lower blocks LB and arranged adjacent to each other, upper connecting blocks UBB are bonded to overlap and bond the upper surfaces of the adjacent lower blocks LB, thereby connecting the lower blocks LB.

[0384] The upper connecting block UBB can be combined with the lower block LB as the second corner connecting clamp 343b is bonded to the lower block LB, so that Figure 28 or Figure 30 As shown, the adhesive 20 is applied to the upper surface of the corner connection prevention wall 42b corresponding to the corner second connection clamping plate 343b and pressure is applied to bond the corner connection prevention wall 42b together.

[0385] At this time, in order to improve the bonding force between the upper connecting block UBB and the lower block LB, pressure is applied to squeeze the adhesive 20 outward to a predetermined extent, so that the entire contact surface of the corner second connecting clamp 343b serving as the bonding area is bonded to the corner connecting barrier 42b.

[0386] However, if the amount of adhesive 20 is too much, the adhesive 20 that overflows outward will overflow into the exposed surfaces of the corner connection bending portion 34b3 and the corner connection heat insulation member 341b, which are non-bonded areas that should not be bonded, resulting in the corner connection bending portion 34b3 and the corner connection barrier 42b or the corner connection heat insulation member 341b and the corner primary heat insulation member 32b of the adjacent upper block UB being bonded. Therefore, additional work of scraping off the adhesive 20 that overflows into the non-bonded area is required at the scene of the occurrence.

[0387] In the case of this embodiment, Figure 18 As shown, the gap between the corner connecting insulation 341b of the upper connecting block UBB and the corner primary insulation 32b of the upper block UB is narrow enough to prevent the adhesive 20 from overflowing from being visually confirmed, and thus it is difficult to scrape off the adhesive 20 overflowing through the gap.

[0388] Therefore, in this embodiment, Figure 25 as well as Figure 26 As shown, the structure further includes an anti-adhesion member 30 to prevent the adhesive 20 from overflowing onto the exposed surfaces of the corner connection bend portion 34b3 and the corner connection heat insulator 341b, which are non-adhesive areas, during bonding of the upper connection block UBB. Even if the adhesive 20 overflows, the structure prevents adhesion between the corner connection bend portion 34b3 and the corner connection barrier 42b, or between the corner connection heat insulator 341b and the adjacent corner primary heat insulator 32b of the upper block UB. The anti-adhesion member 30 can be formed of a sponge film.

[0389] like Figure 25 As shown, the anti-sticking member 30 can be provided on the exposed surfaces of the corner connection bent portion 34b3 and the corner connection heat insulating member 341b as the non-sticking area in the upper connection block UBB.

[0390] In addition, if Figure 26 As shown, the anti-bonding member 30 is arranged on the exposed surface of the corner connection anti-wall 42b of the lower block LB in contact with the corner connection bending portion 34b3 of the upper connection block UBB as a non-bonding area, and the inner bending portion 3b3 of the upper block UB adjacent to the corner connection insulation member 341b of the upper connection block UBB as a non-bonding area, and the exposed surfaces of the corner primary insulation member 32b.

[0391] like Figure 18 、 Figure 28 as well as Figure 30 As shown, the upper blocks UB of this embodiment are arranged side by side with a predetermined gap therebetween and are bonded to the upper surface of the lower block LB. The upper blocks UB are bonded to the lower block LB as the outer primary clamping plates 33b are bonded to the lower block LB. Therefore, adhesive 20 is applied to the upper surface of the corner secondary barrier 41b corresponding to the outer primary clamping plates 33b, and pressure is applied to achieve bonding.

[0392] At this time, in order to improve the bonding force between the upper block UB and the lower block LB, pressure is applied to squeeze the adhesive 20 outward to a predetermined extent so that the entire contact surface of the outer primary clamping plate 33b as the bonding area is bonded to the corner secondary barrier 41b.

[0393] In addition, if Figure 18 、 Figure 28 as well as Figure 30 As shown, when a plurality of upper blocks UB are bonded to the upper surfaces of lower blocks LB and arranged adjacent to each other, the upper connecting blocks UBB of this embodiment are bonded to the upper surfaces of adjacent lower blocks LB, thereby connecting the lower blocks LB. Such upper connecting blocks UBB are bonded to the lower blocks LB as the second corner connecting clamps 343b are bonded to the lower blocks LB. Therefore, adhesive 20 is applied to the upper surfaces of the corner connecting barrier 42b corresponding to the second corner connecting clamps 343b, and pressure is applied to achieve bonding.

[0394] At this time, in order to improve the bonding force between the upper connecting block UBB and the lower block LB, pressure is applied to squeeze the adhesive 20 outward to a predetermined extent, so that the entire contact surface of the corner second connecting clamp 343b serving as the bonding area is bonded to the corner connecting barrier 42b as much as possible.

[0395] However, in this embodiment, the gaps between the corner primary heat insulating member 32b of the upper block UB and the adjacent corner primary heat insulating member 32b of the upper block UB, as well as the gaps between the corner connecting heat insulating member 341b of the upper connecting block UBB and the corner primary heat insulating member 32b of the upper block UB, are narrow enough to prevent the adhesive 20 from overflowing from being visually detected. Therefore, squeeze-out cannot be detected. In other words, sufficient application of the adhesive 20 cannot be confirmed when bonding the upper block UB and the upper connecting block UBB to the lower block LB. This can lead to a decrease in the bonding strength between the upper block UB and the lower block LB, or between the upper connecting block UBB and the lower block LB, due to insufficient bonding area, or poor bonding, such as the adjacent blocks UB and UBB being bonded together.

[0396] Therefore, in this embodiment, Figures 27 to 30As shown, an overflow confirmation unit is provided for confirming overflow of the adhesive 20 when the upper block UB and the upper connecting block UBB are adhesively bonded to the lower block LB, thereby preventing adhesive bonding failure.

[0397] Among them, the overflow confirmation unit can be Figure 27 (a) shows the chamber CF provided on both sides of the outer primary clamping plate 33b of the upper block UB and Figure 27 As shown in (b), the chambers CF are provided at both sides of the second connecting clamping plate 343b at the corners of the upper connecting block UBB. Figure 28 As shown, when the upper block UB and the upper connecting block UBB are arranged on the lower block LB, such a cavity CF forms a space between the upper block UB and the adjacent upper block UB and between the upper block UB and the adjacent upper connecting block UBB, so that overflow of the adhesive 20 can be confirmed from the front, etc.

[0398] Additionally, the overflow confirmation unit can be Figure 29 The groove GV shown in (a) is provided adjacent to both side edges of the outer primary clamping plate 33b of the upper block UB and Figure 29 As shown in (b) of FIG. 1 , the groove GV is provided adjacent to both side edges of the second connecting clamping plate 343b of the upper connecting block UBB. Figure 30 As shown, such a groove GV allows for confirmation from the front or the like that the adhesive 20 overflows from the upper blocks UB and the upper connecting blocks UBB when the plurality of upper blocks UB and the upper connecting blocks UBB are arranged on the lower block LB.

[0399] Therefore, in this embodiment, the outer primary clamping plate 33b and the corner second connecting clamping plate 343b, which serve as overflow confirmation means, respectively, are designed as a cavity CF or a groove GV. This reduces the weight of the upper block UB and the upper connecting block UBB, and allows visual confirmation of adhesive 20 spillage after adhesive 20 is applied to the upper block UB and the upper connecting block UBB, thereby improving system stability. Comparing the cavity CF and the groove GV as overflow confirmation means, the cavity CF allows for a greater amount of applied adhesive 20 than the groove GV, thereby enhancing adhesive strength.

[0400] Figure 33 It is a diagram for explaining a liquefied gas storage tank according to a tenth embodiment of the present invention.

[0401] like Figure 33As shown, in the liquefied gas storage tank 200 according to the tenth embodiment of the present invention, after installing corner blocks CB in the corner portion and installing flat blocks FB in the flat portion, an operation is performed to fill the gap between the corner blocks CB and the flat blocks FB, which is generated due to the tank hull and the block installation tolerance, with insulation material.

[0402] Generally speaking, it is well known that the work of filling the gap formed between the corner block CB and the flat block FB with insulation material (block connection system installation work) is complicated and time-consuming because the size of the gap is not constant.

[0403] In this regard, in this embodiment, the operation of filling the gap formed by the junction of the corner block CB and the plane block FB with the thermal insulation member can be simplified, as described in detail below.

[0404] The liquefied gas storage tank 100 includes: a flat block FB provided at a corner portion; a flat block FB provided at a flat portion; a block connection system 40; and a gap provided at a portion where the corner block CB and the flat block FB meet due to a tank hull and block installation tolerances.

[0405] The plane block FB includes: a flat primary insulation wall 3a, a flat primary barrier 2a made of fixed metal material, and arranged on the outside of the flat primary barrier 2a; a flat secondary barrier 41a, arranged on the outside of the flat primary insulation wall 3a; and a flat secondary insulation wall 5a, arranged on the outside of the flat secondary barrier 41a, and arranged on the hull 7. The plane block FB is arranged in the flat part of the first surface or the second surface having different angles from each other, and can form a storage space for accommodating liquefied gas together with the corner block CB.

[0406] In this embodiment, the plane block FB may have a structure that is the same as or similar to the plane block in the first embodiment, but is not limited thereto and may also have other known plane block structures.

[0407] The corner block CB includes: a corner primary insulation wall 3b, a corner primary defense wall 2b made of fixed metal material, and arranged on the outside of the corner primary defense wall 2b; a corner secondary defense wall 41b, arranged on the outside of the corner primary insulation wall 3b; and a corner secondary insulation wall 5b, arranged on the outside of the corner secondary defense wall 41b, and arranged on the hull 7. The corner block CB is arranged at the corner part where the first surface and the second surface meet, and can form a storage space for accommodating liquefied gas together with the plane block FB.

[0408] In this embodiment, the corner block CB may have the same or similar structure as the corner blocks in the first to ninth embodiments, but is not limited thereto and may also have other known corner block structures.

[0409] The block connection system 40 may be provided in the gap between the flat secondary insulation wall 5 a of the flat block FB and the corner secondary insulation wall 5 b of the corner block CB to connect the flat block FB and the corner block CB, and may include: a flow path member 41 , a block buffer member 42 and a block connection member 43 .

[0410] The flow path member 41 can be set at the bottom of the gap in a manner that the first space between the plane block FB and the hull 7 and the second space between the corner block CB and the hull 7 communicate with each other, and can provide a liquid flow channel such as condensed water or a nitrogen circulation (N2Gas Circulation) channel.

[0411] That is, although it will be described later, the block connecting member 43 of the present embodiment is formed in a manner of automatically spraying using the spray device 50. Therefore, when the flow path member 41 is not equipped, the block connecting member 43 will block the first space at the bottom of the plane block FB and the second space at the bottom of the corner block CB. As a result, there is a problem that the flow path of liquid such as condensed water or nitrogen gas flowing in the lower parts of each of the plane block FB and the corner block CB is blocked.

[0412] The flow path member 41 of this embodiment may be formed as a mesh-shaped melamine foam, but is not limited thereto and may also be formed as other members through which gas or liquid can pass.

[0413] The block buffer member 42 may be provided in a forward manner on the side surface of the plane block FB constituting one side surface of the gap.

[0414] The block buffer member 42 can be made of a relatively thin, soft thermal insulation material to mitigate the load between the flat block FB and the corner block CB caused by external forces due to hull movement, as well as the load caused by thermal relaxation / contraction. The soft thermal insulation material forming the block buffer member 42 can be, for example, low-density polyurethane foam or glass wool. While the block buffer member 42 formed of a soft thermal insulation material cannot function as a strength member as described later, it can be manufactured to a minimal thickness to mitigate external loads.

[0415] The block connection member 43 can be installed in a post-installed manner by spraying a hard heat insulating material into the gap between the flow path member 41 and the block buffer member 42 in a pre-installed state using the spraying device 50 .

[0416] The block connecting member 43 can be formed from a material having the same or similar thermal insulation properties as the flat block FB and the corner block CB. Specifically, the block connecting member 43 can be formed from a variety of rigid thermal insulating materials having a strength sufficient to withstand the load of the liquefied gas filled within the liquefied gas storage tank 200. The rigid thermal insulating material forming the block connecting member 43 can be, for example, high-density polyurethane foam, but is not limited thereto.

[0417] The upper surface level of the block connection member 43 described above may be formed similarly or identically to the upper surface levels of the plane block FB and the corner block CB.

[0418] Therefore, when the gaps in different intervals vary greatly due to the tolerance of the tank body, the gap values ​​between the plane block FB and the corner block CB are measured at specific intervals, and then the information is input into the injection device 50 to adjust the amount of insulation injected.

[0419] At this time, the injection device 50 can be manufactured to be able to be set on a track similar to or the same as the track used to set the corner connection barrier 42b, and adjust the amount of injected insulation so that the amount of injected insulation is minimized from splashing onto the upper surface of the plane block FB and the corner block CB.

[0420] In addition, in order to set up the corner connection barrier 42b as a subsequent process, if it is necessary to accurately match the upper surface level of the above-mentioned block connection member 43 with the upper surface level of each of the plane block FB and the corner block CB, the amount of the thermal insulation member can be slightly increased compared to the upper surface level of each of the plane block FB and the corner block CB. After that, the protruding parts can be ground with a grinding machine to make them consistent in level.

[0421] The present invention is not limited to the embodiments described above, and may include a combination of the embodiments or a combination of at least one of the embodiments and a known technique as another embodiment.

[0422] Although the present invention has been described in detail above through specific embodiments, this is for the purpose of illustrating the present invention in detail. The present invention is not limited thereto, and those skilled in the art may make modifications or improvements within the technical concept of the present invention.

[0423] Simple variations and even modifications of the present invention all fall within the scope of the present invention, and the specific protection scope of the present invention will be more clearly understood from the appended claims.

[0424] Description of Reference Signs

[0425] 1, 100, 100a, 200: Liquefied gas storage tank 2: Primary wall

[0426] 2a: Level and defend once. 2b: Corner and defend once.

[0427] 21b, 121b: Anti-wall fixing member 21b1: Combining member

[0428] 122b: Reinforcement 3: Primary insulation wall

[0429] 3a: Flat primary insulation wall 31a: Flat primary plywood

[0430] 32a: Flat primary insulation 33a: Flat connecting insulation wall

[0431] 331a: Flat connection splint 332a: Flat connection thermal insulation

[0432] 3b: Corner primary insulation wall 3b1: Inner first fixing part

[0433] 3b2: Inner second fixing portion 31b: Inner primary splint

[0434] 32b: Corner primary insulation 33b: Outer primary plywood

[0435] 3b12: inner middle fixing portion 31b12: inner middle splint

[0436] 32b12: Corner middle insulation 34b: Corner connecting insulation wall

[0437] 34b1: Corner first connecting and fixing portion 34b2: Corner first connecting and fixing portion

[0438] 341b: Corner connection insulation 342b, 343b: Corner connection splint

[0439] 34b3: Corner connection bend 3b3: Inner bend

[0440] 3b31: Thermal insulation 3b32: Thermal insulation

[0441] 3b33: Outer insulation 3b34: Inner insulation

[0442] 3b35: Thermal insulation 3b36: Thermal insulation

[0443] 3b37: Vacuum insulation panel 3b4: Inner first filling piece

[0444] 3b5: Inner second filling piece 4: Secondary wall

[0445] 41a: Flat secondary defense wall 42a: Flat connection defense wall

[0446] 41b: Corner secondary wall 42b: Corner connection wall

[0447] 5: Secondary insulation wall 5a: Flat secondary insulation wall

[0448] 51a: Flat secondary insulation 52a: Flat secondary plywood

[0449] 5b: Corner secondary insulation wall 5b1: Outer first fixing part

[0450] 5b2: Outer second fixing portion 51b: Inner secondary splint

[0451] 51b1: Peripheral splint 51b2: Inclined splint

[0452] 52b: Corner secondary insulation 53b: Outer secondary plywood

[0453] 5b12: Outer middle fixing portion 51b12: Outer middle splint

[0454] 52b12: outer middle insulation 53b12: inner middle insulation

[0455] 5b3: Outer bending portion 5b31: Heat insulation

[0456] 5b32: Thermal insulation 5b4: External filling

[0457] 6: Adhesive 7: Hull

[0458] 81: First hole 82: Second hole

[0459] 83: Third hole 9: Molded plug

[0460] 10: Filler 11: Main body

[0461] 12: End 20: Adhesive

[0462] 30: Anti-adhesion components 40: Block connection system

[0463] 41: Flow path member 42: Block buffer member

[0464] 43: Block connecting member 50: Injection device

[0465] ED: Separation direction FB: Plane block

[0466] CB: Corner Block LB: Lower Block

[0467] UB: Upper block UBB: Upper connecting block

[0468] CF: Chamber GV: Groove

Claims

1. A liquefied gas storage tank comprising a corner block disposed at a corner portion where a first surface and a second surface having different angles meet and forming a storage space for accommodating liquefied gas, wherein: The corner block includes a lower block, a plurality of upper blocks, and an upper connecting block. The lower block is arranged on the inner side of the first surface and the second surface and is composed of a single plate. The plurality of upper blocks are adjacently arranged on the lower block and bonded together. The upper connecting block is bonded to the upper surfaces of the adjacent lower blocks and connects the lower blocks. The upper block includes a metal anti-wall fixing member, an inner primary splint, a corner primary heat insulation member and an outer primary splint. The wall-prevention fixing member is configured to be bent at a predetermined angle on the inner sides of the first surface and the second surface, fix the metal corner primary wall, and be arranged on the outer side of the corner primary wall, the inner primary clamping plate is arranged on the outer side of the wall-prevention fixing member, the corner primary heat insulating member is arranged on the outer side of the inner primary clamping plate, and the outer primary clamping plate is arranged on the outer side of the corner primary heat insulating member and is bonded to the lower block; The outer primary plywood having a plurality of first holes is bonded to the outer side surface of the corner primary thermal insulation member having a plurality of second holes. The inner primary plywood having a plurality of third holes is bonded to the inner side of the corner primary thermal insulation member. When the outer primary splint, the corner primary insulation part and the inner primary splint are bonded together, the anti-wall fixing member is fixed to the upper surface of the inner primary splint. When the anti-wall fixing member is fixed to the inner primary splint, molded plugs are respectively inserted into the connecting holes formed by the multiple first holes and the second holes.

2. The liquefied gas storage tank according to claim 1, wherein: The anti-wall fixing member is combined with the inner primary clamping plate bolt.

3. The liquefied gas storage tank according to claim 1, wherein: The filling of the additional thermal insulation material is omitted or constructed between the corner primary thermal insulation materials of the upper blocks arranged adjacent to each other.

4. The liquefied gas storage tank according to claim 1, wherein: The filling of an additional thermal insulation material is omitted or constructed between the corner primary thermal insulation material of the upper block and the corner connecting thermal insulation material of the upper connecting block which are arranged adjacent to each other.

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