Liquefied gas storage tank and vessel comprising a liquefied gas storage tank

Abstract

The liquefied gas storage tank of the present application includes: a flat block configured in a flat portion of a first face or a second face having different angles from each other forming a storage space containing liquefied gas, the flat block including a flat first thermal insulation wall, a flat second barrier wall, and a flat second thermal insulation wall, the flat first thermal insulation wall fixing a flat first barrier wall of a metal material and being configured outside the flat first barrier wall, the flat second barrier wall being disposed outside the flat first thermal insulation wall, and the flat second thermal insulation wall being configured outside the flat second barrier wall; and a corner block configured in a corner portion where the first face and the second face meet, the corner block including a corner first thermal insulation wall, a corner second barrier wall, and a corner second thermal insulation wall, the corner first thermal insulation wall fixing a corner first barrier wall of a metal material and being configured outside the corner first barrier wall, the corner second barrier wall being disposed outside the corner first thermal insulation wall, and the corner second thermal insulation wall being configured outside the corner second barrier wall, the corner first thermal insulation wall including an outside first clamping plate fixed to the corner second barrier wall, an inside first clamping plate fixing the corner first barrier wall, and a corner first thermal insulation member configured between the inside first clamping plate and the outside first clamping plate.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquefied gas storage tank and a ship including the same. BACKGROUND

[0002] Recently, liquefied natural gas (LNG), liquefied petroleum gas (LPG), etc. are used more and more instead of gasoline or diesel, according to technical development and environmental regulation.

[0003] In addition, in a LNG carrier, a LNG RV (Regasification Vessel), a LNG FPSO (Floating, Production, Storage and Offloading), a LNG FSRU (Floating Storage and Regasification Unit), etc. that transport or store liquefied gas such as LNG at sea, a storage tank (referred to as a "cargo hold") that stores LNG in a liquid state at an extremely low temperature is provided, and according to IMO environmental regulation, a very large crude carrier (VLCC) and various cargo ships also use a LNG fuel tank.

[0004] In addition, a liquefied gas storage tank generates boil off gas (BOG) due to heat intrusion from the outside, and the core of the design of the liquefied gas storage tank is to reduce the boil off rate (BOR) of the gasification ratio of the boil off gas by insulation design. In addition, the liquefied gas storage tank is exposed to various loads such as sloshing, and thus it is necessary to secure the mechanical strength of the insulation panel.

[0005] In consideration of this, research is actively being conducted to secure the mechanical strength of the insulation panel even in a corner portion constituting a right angle or an obtuse angle in the liquefied gas storage tank, and to improve the insulation performance so that stress caused by various loads such as sloshing, deformation of the hull, and temperature change is reduced. SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] The present application has been made to solve the above-described problems of the related art, and an object of the present application is to provide a liquefied gas storage tank and a ship including the same, which can reduce the low-temperature burden, the sloshing burden, and the stress burden of the corner secondary barrier by improving the structure of the corner block.

[0008] TECHNICAL SOLUTION TO THE PROBLEMS

[0009] A liquefied gas storage tank according to an aspect of the present invention includes: a flat block disposed in a flat portion of a first face or a second face having different angles from each other forming a storage space in which a liquefied gas is stored, the flat block including a flat first thermal insulation wall, a flat second barrier wall, and a flat second thermal insulation wall, the flat first thermal insulation wall fixing a flat first barrier wall of a metal material and being disposed outside the flat first barrier wall, the flat second barrier wall being disposed outside the flat first thermal insulation wall, and the flat second thermal insulation wall being disposed outside the flat second barrier wall; and a corner block disposed in a corner portion where the first face and the second face meet, the corner block including a corner first thermal insulation wall, a corner second barrier wall, and a corner second thermal insulation wall, the corner first thermal insulation wall fixing a corner first barrier wall of a metal material and being disposed outside the corner first barrier wall, the corner second barrier wall being disposed outside the corner first thermal insulation wall, and the corner second thermal insulation wall being disposed outside the corner second barrier wall, the corner first thermal insulation wall including an outside first clamping plate fixed to the corner second barrier wall, an inside first clamping plate fixing the corner first barrier wall, and a corner first thermal insulation member disposed between the inside first clamping plate and the outside first clamping plate.

[0010] Specifically, the corner first thermal insulation wall can include an inside first fixing portion and an inside second fixing portion disposed at an inside of the first face and the second face, respectively, and constituted by the outside first clamping plate, the corner first thermal insulation member, and the inside first clamping plate, and an inside bent portion constituted by filling a thermal insulation member between the inside first fixing portion and the inside second fixing portion.

[0011] Specifically, the corner first thermal insulation member can be a high-density polyurethane foam, and the thermal insulation member of the inside bent portion can be a low-density polyurethane foam.

[0012] Specifically, the corner first barrier wall can be configured to be fixed to the inside first clamping plate of the inside first fixing portion and the inside first clamping plate of the inside second fixing portion, and bent from an inner surface of the thermal insulation member of the inside bent portion.

[0013] Specifically, the corner second thermal insulation wall can include an outside first fixing portion and an outside second fixing portion fixed to an inside of the first face and the second face, respectively, and constituted by an inside second clamping plate, a corner second thermal insulation member, and an outside second clamping plate disposed in order outside the corner second barrier wall, and a side surface facing the outside first fixing portion fixed to the first face and the outside second fixing portion fixed to the second face can be configured to be inclined in a direction in which the corner portion is divided.

[0014] Specifically, the thickness of the corner primary insulation wall of the corner block connected with the flat primary insulation wall of the flat block and the thickness of the corner secondary insulation wall of the corner block connected with the flat secondary insulation wall of the flat block can be the same or similar.

[0015] Another aspect of the liquefied gas storage tank according to the present application includes a corner block disposed at a corner portion where a first face and a second face having different angles from each other meet and forming a storage space in which a liquefied gas is stored, the corner block including a lower block disposed at an inner side of the first face and the second face and composed of a single plate, a plurality of upper blocks adjacently disposed on the lower block and adhesively coupled, and an upper coupling block adhesively coupled to upper surfaces of the lower blocks adjacently disposed and connecting between the lower blocks, the upper block (or the upper coupling block) including a barrier fixing member of a metal material, an inner side primary clamping plate (or a corner first coupling clamping plate), a corner primary insulation member (or a corner coupling insulation member), and an outer side primary clamping plate (or a corner second coupling clamping plate), the barrier fixing member being bent at a predetermined angle at the inner side of the first face and the second face, fixing a corner primary barrier of a metal material, and disposed at an outer side of the corner primary barrier, the inner side primary clamping plate (or the corner first coupling clamping plate) being disposed at an outer side of the barrier fixing member, the corner primary insulation member (or the corner coupling insulation member) being disposed at an outer side of the inner side primary clamping plate (or the corner first coupling clamping plate), the outer side primary clamping plate (or the corner second coupling clamping plate) being disposed at an outer side of the corner primary insulation member (or the corner coupling insulation member) and adhesively coupled to the lower block, the outer side primary clamping plate (or the corner second coupling clamping plate) having a plurality of first holes being adhesively coupled to an outer side surface of the corner primary insulation member (or the corner coupling insulation member) having a plurality of second holes, the inner side primary clamping plate (or the corner first coupling clamping plate) having a plurality of third holes being adhesively coupled to an inner side surface of the corner primary insulation member (or the corner coupling insulation member), the barrier fixing member being fixed to an upper surface of the inner side primary clamping plate (or the corner first coupling clamping plate) in a state where the outer side primary clamping plate (or the corner second coupling clamping plate), the corner primary insulation member (or the corner coupling insulation member), and the inner side primary clamping plate (or the corner first coupling clamping plate) are adhesively coupled, and a plug being respectively inserted into communication holes formed by the plurality of first holes and the second holes in a state where the barrier fixing member is fixed to the inner side primary clamping plate (or the corner first coupling clamping plate).

[0016] Specifically, the barrier fixing member can be bolt-coupled to the inner side primary clamping plate (or the corner first coupling clamping plate).

[0017] Specifically, the filling of additional thermal insulators or the filling of additional thermal insulators can be omitted between the corner primary thermal insulators of the upper blocks arranged adjacent to each other.

[0018] Specifically, the filling of additional thermal insulators or the filling of additional thermal insulators can be omitted between the corner primary thermal insulators of the upper blocks arranged adjacent to each other and the corner connection thermal insulators of the upper connection blocks.

[0019] Technical effects

[0020] The liquefied gas storage tank according to the present application and the ship having the same can reduce the low-temperature burden, the sloshing burden, and the stress burden of the corner secondary barrier by improving the structure of the corner block.

[0021] Further, the liquefied gas storage tank according to the present application and the ship having the same can improve the thermal insulation performance, reduce the weight, and reduce the cost by forming the inner side first fixing portion and the inner side second fixing portion of the barrier fixing member for fixing the corner primary barrier in the corner block not only from a clamping plate but also from a structure combined with the thermal insulator of polyurethane foam, compared to the conventional structure formed only from the clamping plate.

[0022] Further, the liquefied gas storage tank according to the present application and the ship having the same can reduce the low-temperature burden and the sloshing burden of the corner secondary barrier by configuring the thickness of the corner primary thermal wall of the corner block connected to the flat primary thermal wall of the flat block and the thickness of the corner secondary thermal wall of the corner block connected to the flat secondary thermal wall of the flat block to be the same as or similar to each other, compared to the conventional structure, the thickness of the corner primary thermal wall is relatively thicker (it is noted that the thickness of the corner secondary thermal wall is the thickness that can maintain a certain level of mechanical strength), not only can prevent damage to the corner secondary barrier, but also the low-temperature burden of the corner secondary barrier is reduced and the brittle failure of the ship body can be prevented.

[0023] Further, the liquefied gas storage tank according to the present application and the ship having the same can increase the length of the portion of the corner secondary barrier that is not bonded to the corner secondary thermal wall, not only can more reduce the probability of damage to the corner secondary barrier including the corner connection barrier due to the increase in the flexibility of the corner secondary barrier, but also the corner secondary barrier can easily absorb the deformation of the ship body and the low-temperature stress is further reduced, by configuring the thickness of the corner primary thermal wall to be relatively thicker than the conventional structure.

[0024] Further, the liquefied gas storage tank and the ship having the same according to the present application make the inner side first fixing part and the inner side second fixing part, which are respectively provided at the inner side of the first face and the second face having different angles from each other, spaced apart from each other by a predetermined interval, and make the inner side intermediate fixing part between the inner side first fixing part and the inner side second fixing part, whereby the bending angle of the corner primary barrier can be relieved by the inner side intermediate fixing part, so that not only the sway burden in the corner primary barrier can be reduced, but also the mechanical strength of the corner portion can be increased.

[0025] Further, the liquefied gas storage tank and the ship having the same according to the present application make the outer side first fixing part and the outer side second fixing part, which are respectively fixed at the outer side of the first face and the second face having different angles from each other, face the edge corner, and make the chamber at the edge corner, and fill the chamber with the low-density polyurethane foam, whereby the thermal insulation performance in the corner portion can be more increased by the low-density polyurethane foam.

[0026] Further, the liquefied gas storage tank and the ship having the same according to the present application make the outer side first fixing part and the outer side second fixing part, which are respectively fixed at the outer side of the first face and the second face having different angles from each other, face the edge corner, and make the chamber at the edge corner, and fill the chamber with the low-density polyurethane foam, whereby the thermal insulation performance in the corner portion can be more increased by the low-density polyurethane foam.

[0027] Further, the liquefied gas storage tank and the ship having the same according to the present application make the outer side first fixing part and the outer side second fixing part, which are respectively fixed at the outer side of the first face and the second face having different angles from each other, face the edge corner, and make the chamber at the edge corner, and fill the chamber with the low-density polyurethane foam, whereby the thermal insulation performance in the corner portion can be more increased by the low-density polyurethane foam.

[0028] Furthermore, the liquefied gas storage tank and the ship having the same according to the present application, in which a cavity is formed at a corner facing the outer side first fixing part and the outer side second fixing part fixed to the first face and the second face having different angles from each other, respectively, and an angle secondary barrier is provided along a surface of the outer side first fixing part and the outer side second fixing part including a cavity part, whereby the angle secondary barrier is bent outwardly to increase a length of a portion not adhered to the angle secondary barrier, and not only the damage probability of the angle secondary barrier including the angle secondary barrier can be more reduced due to an increase in flexibility of the angle secondary barrier, but also the ship body deformation absorption can be easily achieved by the angle secondary barrier, and the low temperature stress is more reduced.

[0029] Furthermore, the liquefied gas storage tank and the ship having the same according to the present application, in which the angle primary barrier including the inner side primary clamping plate constituting a step with the angle primary thermal insulation member is disposed in plural on the angle secondary thermal insulation wall, and the angle primary thermal insulation members adjacent to each other are disposed in abutment with each other, whereby not only the installation operation of the barrier fixing member can be easily achieved by the step portion between the inner side primary clamping plates disposed in abutment with each other, but also the consumption of the filler can be reduced since the filler is required to be disposed only in the step portion.

[0030] Furthermore, the liquefied gas storage tank and the ship having the same according to the present application, in which the back surface of the barrier fixing member is not equipped with a reinforcing member such as a reinforcing member, whereby the weight of the barrier fixing member itself can be reduced, and since the welding for the attachment of the reinforcing member is not performed, the welding man-hour and the precision at the time of manufacturing can be reduced, and by uniformly distributing the stress generated at the portion bent at a right angle or an obtuse angle, the generation frequency of damage in the bent portion can be reduced, the repair can be minimized, and the stability of the system can be improved compared to the conventional general barrier fixing member having the reinforcing member.

[0031] Furthermore, the liquefied gas storage tank and the ship having the same according to the present application, in which the outer side primary clamping plate and the angle second connecting clamping plate as the lower layer of each of the upper block and the upper connecting block are respectively applied with a cavity or a groove as an overflow confirmation unit, whereby the weight of each of the upper block and the upper connecting block itself can be reduced, and after the adhesive is applied to each of the upper block and the upper connecting block, the overflow of the adhesive can be directly confirmed with the naked eye, and thus the stability of the system can be improved.

[0032] Further, the liquefied gas storage tank and the ship having the same according to the present application can not only constantly maintain the gap interval between the upper blocks adjacent to each other and the gap interval between the upper blocks and the upper connecting block, but also fix the inner side bent portion of the upper block and the corner connecting bent portion of the upper connecting block, by inserting the filler sheet into the first step space generated between the inner side primary clamps of the upper blocks adjacent to each other and the second step space generated between the inner side primary clamps of the upper blocks and the corner first connecting clamps of the upper connecting block, thereby easily performing the operation when the upper blocks are worked.

[0033] Further, the liquefied gas storage tank and the ship having the same according to the present application can not only constantly maintain the gap interval between the upper blocks adjacent to each other and the gap interval between the upper blocks and the upper connecting block, but also fix the inner side bent portion of the upper block and the corner connecting bent portion of the upper connecting block, by inserting the filler sheet into the first step space generated between the inner side primary clamps of the upper blocks adjacent to each other and the second step space generated between the inner side primary clamps of the upper blocks and the corner first connecting clamps of the upper connecting block, thereby easily performing the operation when the upper blocks are worked.

[0034] Further, the liquefied gas storage tank and the ship having the same according to the present application can not only constantly maintain the gap interval between the upper blocks adjacent to each other and the gap interval between the upper blocks and the upper connecting block, but also fix the inner side bent portion of the upper block and the corner connecting bent portion of the upper connecting block, by inserting the filler sheet into the first step space generated between the inner side primary clamps of the upper blocks adjacent to each other and the second step space generated between the inner side primary clamps of the upper blocks and the corner first connecting clamps of the upper connecting block, thereby easily performing the operation when the upper blocks are worked. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a partial cross-sectional view for explaining a flat portion of the liquefied gas storage tank of the first embodiment of the present application.

[0036] Figure 2 is a cross-sectional view for explaining a corner portion of the liquefied gas storage tank of the first embodiment of the present application.

[0037] Figure 3 is a graph showing a result of structural analysis of the corner portion of the liquefied gas storage tank of the first embodiment of the present application.

[0038] Figure 4 is a graph showing another result of structural analysis of the corner portion of the liquefied gas storage tank of the first embodiment of the present application.

[0039] Figure 5 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a second embodiment of the present application.

[0040] Figure 6 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the second embodiment of the present application.

[0041] Figure 7 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a third embodiment of the present application.

[0042] Figure 8 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the third embodiment of the present application.

[0043] Figure 9 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a fourth embodiment of the present application.

[0044] Figure 10 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the fourth embodiment of the present application.

[0045] Figure 11 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a fifth embodiment of the present application.

[0046] Figure 12 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the fifth embodiment of the present application.

[0047] Figure 13 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a sixth embodiment of the present application.

[0048] Figure 14 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the sixth embodiment of the present application.

[0049] Figure 15 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a seventh embodiment of the present application.

[0050] Figure 16 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the seventh embodiment of the present application.

[0051] Figure 17 is a partial front view for explaining a corner portion of a liquefied gas storage tank of an eighth embodiment of the present application.

[0052] Figure 18 is a partial front view for explaining a corner portion of a liquefied gas storage tank of a ninth embodiment of the present application.

[0053] Figure 19 is a perspective view for illustrating the upper block of Figure 18

[0054] Figure 20 is a perspective view for illustrating the upper connecting block of Figure 18

[0055] Figure 21 is an exploded perspective view of the upper block of Figure 19

[0056] Figure 22 is a sectional view of the upper block of Figure 19

[0057] Figure 23 is a sectional view showing another embodiment of the upper block of Figure 19

[0058] Figure 24 is a perspective view for illustrating the filling sheet of Figure 18

[0059] Figure 25 is a diagram for illustrating the anti-sticking structure member applicable in the upper connecting block of Figure 18

[0060] Figure 26 is a diagram for illustrating another embodiment of the anti-sticking structure member applicable in the upper connecting block of Figure 18

[0061] Figure 27 (a) and (b) of are diagrams for illustrating another embodiment of the upper block and the upper connecting block of Figure 18

[0062] Figure 28 is a partially enlarged front view of the corner portion of the upper block and the upper connecting block to which Figure 27

[0063] Figure 29 (a) and (b) of are diagrams for illustrating still another embodiment of the upper block and the upper connecting block of Figure 18

[0064] Figure 30 is a partially enlarged front view of the corner portion of the upper block and the upper connecting block to which Figure 29

[0065] Figure 31 (a) and (b) of are diagrams showing the results of structural analysis of each of the barrier fixing member of the present embodiment not equipped with a reinforcing member and the barrier fixing member of the comparative example equipped with a reinforcing member.

[0066] ​​​​​​​​​​​​Figure 32 Figures (a) and (b) are diagrams showing the structural analysis results of the structures (clamps) provided on the lower side of the wall-mounting member of this embodiment without reinforcement and the wall-mounting member of a comparative example equipped with reinforcement.

[0067] Figure 33 This is a diagram illustrating a liquefied gas storage tank according to the tenth embodiment of the present invention. Detailed Implementation

[0068] The objectives, specific advantages, and novel features of this invention will become clearer from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that when assigning reference numerals to structural elements in the various figures in this specification, the same reference numerals are used for the same structural elements in other figures whenever possible. Furthermore, in the description of this invention, if a specific description of related prior art is deemed unnecessary to affect the spirit of the invention, such description is omitted.

[0069] Furthermore, the accompanying drawings are merely for the purpose of facilitating a clearer understanding of the embodiments described herein, and are not intended to limit the technical concept of this specification. They should be understood to include all modifications, equivalents, and substitutions contained within the scope of the invention.

[0070] Furthermore, terms containing ordinal numbers such as "first" and "second" can be used to describe various structural elements; however, the structural elements are not limited to these terms. These terms are used only to distinguish one structural element from others. Additionally, throughout the specification, the term "outer side" refers to the outer side of the tank relative to the liquefied gas storage tank, and the term "inner side" refers to the inner side of the tank relative to the liquefied gas storage tank.

[0071] In the following specification, liquefied gas may be used to mean all gaseous fuels that are normally stored in a liquid state, such as LNG, LPG, ethylene, and ammonia. For ease of explanation, it may also be referred to as liquefied gas when it is heated or pressurized instead of being liquid. The same applies to evaporating gas. Furthermore, for ease of explanation, LNG may be used to mean not only liquid NG (Natural Gas) but also LNG in a supercritical state, and evaporating gas may be used to mean not only gaseous evaporating gas but also liquefied evaporating gas.

[0072] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0073] Figure 1 This is a partial cross-sectional view illustrating the flat portion of the liquefied gas storage tank according to the first embodiment of the present invention. Figure 2is a cross-sectional view for illustrating a corner portion of a liquefied gas storage tank of a first embodiment of the present application, Figure 3 is a graph showing a result of structural analysis of a corner portion of a liquefied gas storage tank of the first embodiment of the present application, Figure 4 is a graph showing another result of structural analysis of a corner portion of a liquefied gas storage tank of the first embodiment of the present application.

[0074] In a ship having a liquefied gas storage tank 1 described below, although not shown, it can be a concept that, in addition to a merchant ship including a cargo transported from a departure place to a destination, a marine structure floating at a certain position on the sea to perform a specific work is included. Further, the liquefied gas storage tank 1 in the present application can include a tank of any form storing a liquefied gas.

[0075] The liquefied gas storage tank 1 is provided in a ship, can store a liquefied gas such as LNG which is an extremely low temperature (about -160 to -170°C) substance, and can include a flat structure and a corner structure. For example, a transverse wall in a front-rear direction of the liquefied gas storage tank 1, a floor between the transverse walls, a vertical wall, and a ceiling can correspond to the flat structure. Further, for example, a structure in which the transverse wall, the floor, the vertical wall, and the ceiling of the liquefied gas storage tank 1 meet can correspond to the corner structure. Among them, the corner structure can include an obtuse angle corner structure or a right angle corner structure. In a case where the thickness of the primary insulation wall 3 or the secondary insulation wall 5 varies, the variation of the obtuse angle corner structure or the right angle corner structure can be accompanied.

[0076] As shown in Figure 1 , the flat structure of the liquefied gas storage tank 1 can be constituted by a combination of a plurality of flat blocks, as shown in Figure 2 , the corner structure of the liquefied gas storage tank 1 can be constituted by a combination of a plurality of corner blocks. Such a plurality of flat blocks can be connected to a plurality of corner blocks at a corner portion of the liquefied gas storage tank 1.

[0077] As shown in Figure 1 and Figure 2 , the liquefied gas storage tank 1 can include a primary barrier 2 which contacts with a liquefied gas, a primary insulation wall 3 which is provided outside the primary barrier 2, a secondary barrier 4 which is provided outside the primary insulation wall 3, and a secondary insulation wall 5 which is disposed outside the secondary barrier 4. The liquefied gas storage tank 1 is supported on a ship body 7 by a mastic 6 provided between the secondary insulation wall 5 and the ship body 7.

[0078] The primary barrier 2 can be composed of a flat primary barrier 2a of a flat block and a corner primary barrier 2b of a corner block, the primary thermal insulation wall 3 can be composed of a flat primary thermal insulation wall 3a of a flat block and a corner primary thermal insulation wall 3b of a corner block, the secondary barrier 4 can be composed of a flat secondary barrier 41a of a flat block and a corner secondary barrier 41b of a corner block, and the secondary thermal insulation wall 5 can be composed of a flat secondary thermal insulation wall 5a of a flat block and a corner secondary thermal insulation wall 5b of a corner block.

[0079] The secondary barrier 4 of the flat block and the corner block can include a flat connection barrier 42a or a corner connection barrier 42b, the flat connection barrier 42a connecting the flat secondary barrier 41a adjacently arranged, and the corner connection barrier 42b connecting the corner secondary barrier 41b adjacently arranged.

[0080] In such a liquefied gas storage tank 1, in order to optimize the thermal insulation performance and the storage capacity, it can be necessary to optimize the thickness of the primary thermal insulation wall 3 and the secondary thermal insulation wall 5. For example, in the case where polyurethane foam is used as the main material of the primary thermal insulation wall 3 and the secondary thermal insulation wall 5, the total thickness of the thickness of the primary thermal insulation wall 3 and the thickness of the secondary thermal insulation wall 5 can be in the range of 250 mm to 500 mm, and in the case of the present embodiment, the thickness of the primary thermal insulation wall 3 and the thickness of the secondary thermal insulation wall 5 of the flat block and the corner block can be the same or similar.

[0081] That is, in the case of the conventional liquefied gas storage tank, the thickness of the primary thermal insulation wall of the flat block and the corner block is about 1 / 3 thinner than the thickness of the secondary thermal insulation wall, and in contrast, in the present embodiment, the thickness of the primary thermal insulation wall 3 and the thickness of the secondary thermal insulation wall 5 of the flat block and the corner block are the same or similar, and the reason for this will be described later.

[0082] First, referring to Figure 1 The flat portion of the liquefied gas storage tank 1 of the first embodiment of the present application will be described. The flat portion of the liquefied gas storage tank 1 is composed of a combination of a plurality of flat blocks, and the structure of the flat block of the liquefied gas storage tank 1 described below is applicable not only to the first embodiment but also to the second to eighth embodiments described later.

[0083] As Figure 1 shown, the flat block of the liquefied gas storage tank 1 is arranged in the flat portion of the first or second surface having different angles from each other forming a storage space in which a liquefied gas is accommodated, and can include a flat primary thermal insulation wall 3a, a flat primary barrier 2a of a metal material is fixed, and is arranged outside the flat primary barrier 2a, a flat secondary barrier 41a is provided outside the flat primary thermal insulation wall 3a, and a flat secondary thermal insulation wall 5a is arranged outside the flat secondary barrier 41a.

[0084] The flat primary barrier 2a can be disposed in a flat portion of the first or second surface having different angles from each other and form a receiving space that receives a liquefied gas as a cryogenic substance, and is composed of a metal material. For example, the metal material can be stainless steel, but is not limited thereto. The flat primary barrier 2a can prevent the liquefied gas from leaking to the outside together with the flat secondary barrier 41a.

[0085] The flat primary barrier 2a is fixedly combined at the upper portion of the flat primary insulation wall 3a using a metal band (not shown) and directly contacts the liquefied gas as a cryogenic substance stored in the liquefied gas storage tank 1.

[0086] Such a flat primary barrier 2a is connected when the flat blocks and Figure 2 corner blocks shown are adjacently disposed. Figure 2 The flat primary barrier 2a is connected to the flat secondary barrier 41a.

[0087] The flat primary insulation wall 3a is designed to block heat intrusion from the outside and to be able to withstand an impact from the outside or an impact caused by the liquefied gas shaking inside, and can be disposed between the flat primary barrier 2a and the flat secondary barrier 41a.

[0088] The flat primary insulation wall 3a can have a structure in which a flat primary clamp 31a and a flat primary insulation member 32a are sequentially stacked to the outside of the flat primary barrier 2a, and a thickness in which the thickness of the flat primary clamp 31a and the thickness of the flat primary insulation member 32a are added can be formed, for example, to a thickness of 160 mm to 250 mm, but is not limited thereto.

[0089] The flat primary clamp 31a can be disposed between the flat primary barrier 2a and the flat primary insulation member 32a.

[0090] The flat primary insulation member 32a can be formed of a material having excellent thermal insulation performance and excellent mechanical strength to block heat intrusion from the outside and to be able to withstand an impact from the outside or an impact caused by the liquefied gas shaking inside.

[0091] The flat primary insulation member 32a can be formed of polyurethane foam between the flat primary clamp 31a and the flat secondary barrier 4a and occupy a large portion of the thickness of the flat primary insulation wall 3a.

[0092] The flat primary thermal insulation wall 3a is configured as a part of the flat block together with the flat secondary prevention wall 41a and the flat secondary thermal insulation wall 5a, and the flat primary thermal insulation wall 3a constituting the flat block can have a smaller width than the width of the flat secondary thermal insulation wall 5a constituting the other part of the flat block. Thus, a part of the flat secondary prevention wall 41a can be exposed to both sides of the flat primary thermal insulation wall 3a. When a plurality of flat blocks are adjacently arranged, a flat connection thermal insulation wall 33a can be provided in a space portion between the flat primary thermal insulation walls 3a adjacently arranged adjacent to each other, i.e., in a space portion in which the flat secondary prevention wall 41a is exposed.

[0093] The flat connection thermal insulation wall 33a is configured to be arranged between the flat primary thermal insulation walls 3a adjacent to each other when a plurality of flat blocks are adjacently arranged, and can be configured in a stacked form of the flat connection panel 331a and the flat connection thermal insulation member 332a, which are the same as or similar to the flat primary thermal insulation wall 3a, and have the same or similar thickness as the flat primary thermal insulation wall 3a.

[0094] The flat connection thermal insulation wall 33a is configured to seal a space portion between the flat secondary thermal insulation walls 5a adjacently arranged adjacent to each other when a plurality of flat blocks are adjacently arranged, together with the flat connection prevention wall 42a, thereby performing a function of blocking heat intrusion from the outside.

[0095] The flat secondary prevention wall 41a can be provided between the flat primary thermal insulation wall 3a and the flat secondary thermal insulation wall 5a, and can prevent leakage of the liquefied gas to the outside together with the flat primary prevention wall 2a.

[0096] The flat secondary prevention wall 41a is configured as a part of the flat block together with the flat primary thermal insulation wall 3a and the flat secondary thermal insulation wall 5a, and the adjacent flat secondary prevention walls 41a can be connected by the flat connection prevention wall 42a when the flat blocks are adjacently arranged.

[0097] The flat connection prevention wall 42a can connect the adjacent flat secondary prevention walls 41 exposed to the outside when the flat blocks are adjacently arranged, and the flat connection thermal insulation wall 33a can be provided at an upper portion thereof.

[0098] The flat secondary thermal insulation wall 5a can be designed to block heat intrusion from the outside together with the flat primary thermal insulation wall 3a and the flat connection thermal insulation wall 33a and to withstand an impact from the outside or an impact caused by shaking of the liquefied gas inside. In addition, the flat secondary thermal insulation wall 5a can be provided between the flat secondary prevention wall 4a and the ship body 7, and can include a flat secondary thermal insulation member 51a and a flat secondary panel 52a.

[0099] The flat secondary thermal insulation wall 5a can have a structure in which the flat secondary thermal insulation member 51a and the flat secondary clamping plate 52a are sequentially stacked toward the outside of the flat secondary barrier 41a, and the overall thickness of the flat secondary thermal insulation member 51a and the flat secondary clamping plate 52a can be formed to be, for example, 150 mm to 240 mm, which is the same as or similar to the thickness of the flat primary thermal insulation wall 3a, but is not limited thereto.

[0100] The flat secondary thermal insulation member 51a can be formed of a material having excellent thermal insulation performance and excellent mechanical strength to block the intrusion of heat from the outside and to be able to withstand an impact from the outside or an impact caused by the shaking of the liquefied gas inside.

[0101] The flat secondary thermal insulation member 51a can be formed of polyurethane foam between the flat secondary barrier 41a and the flat secondary clamping plate 52a and occupy a large portion of the thickness of the flat secondary thermal insulation wall 5a.

[0102] The flat secondary clamping plate 52a can be disposed between the flat secondary thermal insulation member 51a and the ship body 7.

[0103] As described above, the flat block of the liquefied gas storage tank 1 of the present embodiment can be configured to include that the flat connection thermal insulation wall 33a of the flat primary thermal insulation wall 3a has the same or similar thickness as the thickness of the flat secondary thermal insulation wall 5a. In association with such a structure, the flat connection thermal insulation member 332a of the flat connection thermal insulation wall 33a is made to have a thickness of 90% to 110% of the flat secondary thermal insulation member 51a, so that the flat connection thermal insulation member 332a of the flat connection thermal insulation wall 33a is configured to have the same or similar thickness as the flat secondary thermal insulation member 51a.

[0104] That is, in the case of the conventional liquefied gas storage tank, the thickness of the primary thermal insulation wall of the flat block has a thickness of about 1 / 3 thinner than the thickness of the secondary thermal insulation wall, and in contrast thereto, the thickness of the flat primary thermal insulation wall 3a of the flat block and the thickness of the flat secondary thermal insulation wall 5a in the present embodiment are configured to be the same or similar, which is to prevent damage caused by the low-temperature stress of the flat secondary thermal insulation wall 41a.

[0105] Generally, the flat secondary barrier 41a and the flat secondary insulation wall 5a differ in the amount of self-shrinkage due to exposure to temperature, and 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 amount of shrinkage itself increases as the temperature decreases, and the stress increases at low temperatures, so there is a problem that the risk of damage to the flat secondary barrier 41a increases. Such a problem occurs more often in the flat connecting barrier 42a in which the flat secondary barriers 41a are connected to each other using bonding or the like at the lower part of the flat connecting insulation wall 33a. This is because, at the lower part of the flat connecting insulation wall 33a, the two ends of the flat connecting barrier 42a are connected to the flat secondary barriers 41a of the plurality of flat blocks arranged adjacent to each other, and as the flat secondary insulation walls 5a of the flat blocks shrink, the two ends of the flat connecting barrier 42a can deform away from each other or close to each other.

[0106] In the present embodiment, by forming the flat primary insulation wall 3a including the flat connecting insulation wall 33a and the flat secondary insulation wall 5a to have the same or similar thickness, as the thickness of the flat primary insulation wall 3a including the flat connecting insulation wall 33a is relatively thicker than in the past, the extremely low-temperature burden on not only the flat secondary barrier 41a but also especially the flat connecting barrier 42a is reduced, and in addition, as the thickness of the flat secondary insulation wall 5a is relatively thinner than in the past, the amount of shrinkage itself is reduced, so the burden at low temperatures is reduced. As a result, in the portion in which the plurality of flat blocks are arranged adjacent to each other, the risk of damage to the secondary barrier 4 is relatively reduced compared to the past.

[0107] Referring to Figure 2 , a corner portion of the liquefied gas storage tank 1 of the first embodiment of the present application is described. The corner portion of the liquefied gas storage tank 1 can be composed of a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 described below is described taking the case of an obtuse corner structure that forms an angle of 135 degrees as an example, but is not limited to this value.

[0108] As shown in Figure 2 , the corner block of the liquefied gas storage tank 1 is arranged at a corner portion where a first face and a second face having different angles from each other meet, which forms a storage space that accommodates liquefied gas, and includes a corner primary insulation wall 3b that fixes a corner primary barrier 2b of a metal material and is arranged outside the corner primary barrier 2b, a corner secondary barrier 41b that is provided outside the corner primary insulation wall 3b, and a corner secondary insulation wall 5b that is arranged outside the corner secondary barrier 41b. The corner primary insulation wall 3b can further include an inner side bent portion 3b3.

[0109] The primary corner shield 2b is positioned at the corner where the first or second face, which have different angles from each other, meet, forming a containment space for liquefied gas, which is a cryogenic substance, and can be made of metal. The primary corner shield 2b, together with the secondary corner shield 41b, can prevent liquefied gas from leaking to the outside.

[0110] Although not in Figure 2 As shown, the primary corner insulation wall 2b can be fixedly attached to the primary corner insulation wall 3b by means of various methods such as adhesive bonding or bolting, and can directly contact the liquefied gas, which is a cryogenic substance, stored in the liquefied gas storage tank 1. Therefore, the primary corner insulation wall 2b described below can be interpreted as including the insulation wall fixing component, etc.

[0111] Such a corner defense 2b can be used in corner blocks and Figure 1 When the planar blocks shown are connected in an adjacent configuration, the sealing angle is the primary insulation wall 3b and Figure 1 The flat primary wall 2a shown is fixed to the inner primary clamping plate 31b of the inner first fixing part 3b1 and the inner primary clamping plate 31b of the inner second fixing part 3b2. The inner surface of the heat insulation member 3b31 of the inner bending part 3b3 can be bent at a predetermined angle, for example, at an angle of 135 degrees.

[0112] The primary corner insulation wall 3b can be designed to block heat intrusion from the outside and withstand impacts from the outside or impacts caused by the internal sloshing of liquefied gas, and is located between the primary corner insulation wall 2b and the secondary corner insulation wall 41b.

[0113] The corner primary insulation wall 3b is respectively disposed 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, which are formed by stacking an inner primary clamping plate 31b, a corner primary insulation member 32b and an outer primary clamping plate 33b in sequence on the outer side of the corner primary insulation wall 2b.

[0114] The inner first fixing part 3b1 can be fixed to the outer first fixing part 5b1 and disposed on the inner side of the first surface, and the inner second fixing part 3b2 can be fixed to the outer second fixing part 5b2 and disposed on the inner side of the second surface.

[0115] In addition, the corner primary heat insulation wall 3b may include: an inner bending portion 3b3, which is formed by filling the space between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 with a heat insulation member 3b31.

[0116] In the corner primary thermal insulation wall 3b, the thickness of the inner side primary panel 31b, the thickness of the corner primary thermal insulation member 32b, and the thickness of the outer side primary panel 33b can be added together to be the same thickness as the thickness of the flat primary thermal insulation wall 3a (for example, a thickness of 160 mm to 250 mm).

[0117] The inner side primary panel 31b can be provided between the corner primary barrier 2b and the corner primary thermal insulation member 32b.

[0118] In the present embodiment, as described above, the primary thermal insulation wall 3 in the flat block and the corner block is formed to be relatively thicker than the thickness of the conventional primary thermal insulation wall, and thus the thickness of the inner side primary panel 31b of the corner primary thermal insulation wall 3b constituting the corner block can be reduced, and the remaining thickness can be replaced by the corner primary thermal insulation member 32b formed of polyurethane foam.

[0119] The thickness of the inner side primary panel 31b of the present embodiment can be 20 mm to 80 mm.

[0120] As described above, in the present embodiment, the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2 of the barrier fixing member for supporting the corner primary barrier 2b in the corner block are not formed only of a panel having a thickness of about 92 mm as in the conventional case, but are formed in combination with the corner primary thermal insulation member 32b of polyurethane foam, and thus the thermal insulation performance can be improved, the weight can be reduced, and the cost can be reduced compared to the case where only a panel is used.

[0121] The corner primary thermal insulation member 32b can be disposed between the inner side primary panel 31b and the outer side primary panel 33b, and can be formed of high-density polyurethane foam having excellent thermal insulation performance and excellent mechanical strength to block the intrusion of heat from the outside and to be able to withstand the impact from the outside or the impact caused by the shaking of the liquefied gas inside.

[0122] The outer side primary panel 33b can be disposed between the corner primary thermal insulation member 32b and the corner secondary barrier 41b, and can be fixed to the corner secondary barrier 41b.

[0123] The outer side primary panel 33b can be formed to have a thickness of 6.5 mm to 15 mm.

[0124] As described above, the corner primary thermal insulation wall 3b of the present embodiment is configured in a structure in which the inner side primary splint 31b, the corner primary thermal insulation member 32b, and the outer side primary splint 33b are stacked in this order, whereby the inner side primary splint 31b and the outer side primary splint 33b, which are high in strength, support thermal contraction of the corner primary thermal insulation member 32b, thus avoiding direct application of thermal contraction of the corner primary thermal insulation member 32b to the secondary prevention wall 4, 41b, 42b between the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2, and by providing the corner primary thermal insulation member 32b as an intermediate layer, it is possible to easily manage the tolerance of the inner side primary splint 31b and the outer side primary splint 33b, which are sensitive to humidity.

[0125] The inner side first fixing portion and the inner side second fixing portion 3b1, 3b2, which constitute the corner primary thermal insulation wall 3b, are respectively fixed to the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2, which constitute the corner secondary prevention wall 41b and the corner secondary thermal insulation wall 5b, and the width of each of the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2 can be smaller than the width of each of the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2. Thus, when a plurality of corner blocks are adjacently arranged along the edges of the corner portion facing the first face and the second face having different angles from each other, a space portion between the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2 adjacently arranged adjacent to each other, i.e., a space portion in which the corner secondary prevention wall 41b is exposed, can be formed with the inner side bending portion 3b3.

[0126] The inner side bending portion 3b3 can be configured by filling the thermal insulation member 3b31.

[0127] The thermal insulation member 3b31 of the inner side bending portion 3b3 can be a low-density polyurethane foam, and an outer surface bent at a predetermined angle, for example, an angle of 135 degrees, can be provided with the secondary prevention wall 4 in which the corner secondary prevention wall 41b and the corner connection prevention wall 42b are stacked.

[0128] The thermal insulation member 3b31 of the inner side bending portion 3b3 can seal, together with the corner connection prevention wall 42b, a space portion generated between the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2 adjacently arranged adjacent to each other when a plurality of corner blocks are adjacently arranged, thus performing a function of blocking intrusion of heat from the outside.

[0129] The corner secondary prevention wall 41b can be provided on the outer side of the corner primary thermal insulation wall 3b. The corner secondary prevention wall 41b can be provided between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and can prevent leakage of liquefied gas to the outside, together with the corner primary prevention wall 2b.

[0130] The corner secondary barrier 41b is configured as a part of the corner block together with the corner primary insulation wall 3b and the corner secondary insulation wall 5b, and when the corner blocks are adjacently arranged, the corner secondary barrier 41b adjacent between the outer first fixing part and the outer second fixing part 5b1, 5b2 can be connected by the corner connecting barrier 42b.

[0131] 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 the corner connecting barrier 42b can be provided with the inner side bending part 3b3 of the insulation part 3b31 at the upper part, and can seal the space part generated between the outer first fixing part and the outer second fixing part 5b1, 5b2 adjacently arranged with the inner side bending part 3b3 of the insulation part 3b31, thereby performing the role of blocking the heat from the outside. In the present embodiment, the corner connecting barrier 42b can be extended to be formed to overlap not only between the inner first fixing part and the inner second fixing part 3b1, 3b2, but also at least the length overlapping the inner first fixing part and the inner second fixing part 3b1, 3b2.

[0132] The secondary barrier 4 in which the corner secondary barrier 41b and the corner connecting barrier 42b are stacked can be arranged in a bent manner at the position where the outer first fixing part and the outer second fixing part 5b1, 5b2 meet.

[0133] The corner secondary insulation wall 5b can be arranged outside the corner secondary barrier 41b. The corner secondary insulation wall 5b can be designed to block the heat from the outside together with the corner primary insulation wall 3b and the insulation part 3b31 of the inner side bending part 3b3 and to be able to withstand the impact from the outside or the impact caused by the liquefied gas shaking inside. In addition, the corner secondary insulation wall 5b can be provided between the corner secondary barrier 4b and the ship body 7, and can include an inner side secondary clamp 51b, a corner secondary insulation part 52b, and an outer side secondary clamp 53b.

[0134] The corner secondary insulation wall 5b is fixed to the inner side of the first face and the second face, respectively, and can include an outer first fixing part 5b1 and an outer second fixing part 5b2, and is configured by sequentially stacking the inner side secondary clamp 51b, the corner secondary insulation part 52b, and the outer side secondary clamp 53b to the outside of the corner secondary barrier 2b.

[0135] Among them, the outer first fixing part 5b1 can be fixed to the inner side of the first face, and the outer second fixing part 5b2 can be fixed to the inner side of the second face.

[0136] The side surface facing the first fixing portion 5b1 fixed to the outer side of the first surface and the second fixing portion 5b2 fixed to the outer side of the second surface can be configured to be inclined in the direction ED in which the corner portion is equally divided. Although the case where the corner portion is equally divided is described in the present embodiment, the corner portion can be divided unequally depending on the corner position, and thus the side surface can be configured to be inclined in the direction ED in which the corner portion is unequally divided.

[0137] In the corner secondary thermal insulation wall 5b, the total thickness obtained by adding the thickness of the inner secondary batten 51b, the thickness of the corner secondary thermal insulation member 52b, and the thickness of the outer secondary batten 53b can be the same as the thickness (for example, 150 mm to 240 mm) of the aforementioned flat secondary thermal insulation wall 5a.

[0138] The inner secondary batten 51b can be disposed between the corner secondary barrier 2b and the corner secondary thermal insulation member 51b, and the corner secondary barrier 2b can be fixed to the inner secondary batten 51b. The inner secondary batten 51b can be formed to have a thickness of 6.5 mm to 15 mm.

[0139] The corner secondary thermal insulation member 52b can be formed of a material having excellent thermal insulation performance and excellent mechanical strength to block the intrusion of heat from the outside and to be able to withstand an impact from the outside or an impact caused by the shaking of liquefied gas inside.

[0140] The corner secondary thermal insulation member 52b can be formed of polyurethane foam between the inner secondary batten 51b and the outer secondary batten 53b and occupy a large portion of the thickness of the corner secondary thermal insulation wall 5b.

[0141] The outer secondary batten 53b can be disposed between the corner secondary thermal insulation member 52b and the ship body 7. The outer secondary batten 53b can be formed to have a thickness of 6.5 mm to 25 mm.

[0142] In the liquefied gas storage tank 1 of the present embodiment described above, as the thickness of the primary thermal insulation wall 3 is relatively thicker than in the past, the secondary barrier 4 not only moves from the flat block but also moves toward the ship body 7 side from the corner block to increase the radius of curvature, in which case the radius of curvature of the secondary barrier 4 increases at the corner portion, and thus the length of the portion of the secondary barrier 4 to which the secondary thermal insulation wall 5 is not bonded also increases. This means an increase in the flexibility of the secondary barrier 4 in the obtuse corner structure, and thus the deformation absorption of the peripheral portion of the secondary barrier 4, for example, the ship body deformation absorption, becomes easy, and the low-temperature stress also decreases. In the case of the present embodiment, the length of the unbonded portion is, for example, 0 mm to 100 mm, and is preferably 50 mm to 100 mm.

[0143] As described above, in the obtuse corner structure of the secondary barrier 4 in the present application, compared to the prior art obtuse corner structure formed by the relatively thin thickness of the primary thermal insulation wall 3, the stress applied to the secondary barrier 4 at low temperatures can be reduced. In addition, the unbonded portion increases, so that the ship body deformation absorption also becomes easy.

[0144] This can be confirmed by the results of the structural analysis of the corner portion of the liquefied gas storage tank 1 of the present embodiment. Figure 3 Figure 4 The results of the structural analysis of the corner portion of the liquefied gas storage tank 1 of the present embodiment.

[0145] The structural analysis execution conditions are that the heat transfer analysis was performed at 20°C on the ship body position and 163°C on the primary barrier, and the temperature distribution obtained from the results thereof was used to perform the structural analysis.

[0146] In addition, in the prior art liquefied gas storage tank used to compare the results of the structural analysis of the liquefied gas storage tank 1 of the present embodiment, the thickness of the primary thermal insulation wall of the planar block and the corner block is about 1 / 3 thinner than the thickness of the secondary thermal insulation wall, the fixing member corresponding to the inner first fixing portion, the inner second fixing portion 3b1, 3b2 is only composed of a clamping plate, and the length of the unbonded portion is 50 mm. In such a prior art liquefied gas storage tank, the YY direction stress value of the bent portion in the secondary barrier is about 66.8984 MPa, and the temperature is about -135.857°C.

[0147] The stress value in the YY direction obtained from the results of the structural analysis is the stress value on the corner, the lower the value, the less the burden (stress), and the temperature is the temperature on the corner, the higher the temperature, the less the burden (stress) (the changed value after setting at room temperature 25°C is shown).

[0148] The above conditions can be equally applied to the structural analysis of the liquefied gas storage tank 1 of the second to seventh embodiments described later, not only in the present embodiment.

[0149] Figure 3 ​When the unbonded portion in this embodiment has a length of 50 mm, the results of the structural analysis of the YY-direction stress value and the temperature distribution of the secondary barrier 4, 41b, 42b at the portion where the outer first fixing portion and the outer second fixing portion 5b1, 5b2 face each other and are bent are shown. The YY-direction stress value is 37.155 MPa, and the temperature is -57.940°C. Such values are compared with the case where the YY-direction stress value of the portion where the secondary barrier of the conventional liquefied gas storage tank is bent is about 66.8984 MPa, and the temperature is about -135.857°C. The burden on the secondary barrier 4, 41b, 42b in this embodiment is very small, and this means that the influence of the cold and heat from the extremely low-temperature substance due to the damage and the like caused by the low-temperature stress in the secondary barrier 4, 41b, 42b in this embodiment is reduced compared with the conventional one.

[0150] Figure 4 When the unbonded portion in this embodiment has a length of 97 mm, the results of the structural analysis of the YY-direction stress value and the temperature distribution of the secondary barrier 4, 41b, 42b at the portion where the outer first fixing portion and the outer second fixing portion 5b1, 5b2 face each other and are bent are shown. The YY-direction stress value is 12.084 MPa, and the temperature is -59.025°C. Such values are compared with the case where the YY-direction stress value of the portion where the secondary barrier of the conventional liquefied gas storage tank is bent is about 66.8984 MPa, and the temperature is about -135.857°C. The burden on the secondary barrier 4, 41b, 42b in this embodiment is very small, and this means that the influence of the cold and heat from the extremely low-temperature substance due to the damage and the like caused by the low-temperature stress in the secondary barrier 4, 41b, 42b in this embodiment is reduced compared with the conventional one.

[0151] Thus, in this embodiment, the inner first fixing portion and the inner second fixing portion 3b1, 3b2 of the barrier fixing member for supporting the primary barrier 2b fixed in the corner block are not formed only by the clamping plate but are formed by a structure combined with the thermal insulation member 3b31 of the polyurethane foam, and thus, compared with the conventional structure formed only by the clamping plate, the thermal insulation performance can be improved, the weight can be reduced, and the cost can be reduced.

[0152] Further, in the present embodiment, the corner primary thermal insulation wall 3b of the corner block connected to the planar primary thermal insulation wall 3a of the planar block and the corner secondary thermal insulation wall 5b of the corner block connected to the planar secondary thermal insulation wall 5a of the planar block are configured to have the same or similar thicknesses, and thus, compared to the past, the thickness of the corner primary thermal insulation wall 3b is relatively thicker (it is noted that the thickness of the corner secondary thermal insulation wall 5b is a thickness that can maintain the mechanical strength at a prescribed level), the low-temperature burden and the sway burden of the secondary barrier 4, 41b, 42b between the outer first fixing portion and the outer second fixing portion 5b1, 5b2 can be reduced, not only the damage to the secondary barrier 4, 41b, 42b can be prevented, but also the low-temperature burden of the secondary barrier 4, 41b, 42b can be reduced, and thus, the brittle failure of the hull 7 can be prevented.

[0153] Further, in the present embodiment, the corner primary thermal insulation wall 3b is configured to have a relatively thicker thickness than in the past, and thus, the length of the portion of the secondary barrier 4, 41b, 42b that is not bonded to the corner secondary thermal insulation wall 5b can be increased, and thus, not only the damage probability of the secondary barrier 4, 41b, 42b can be further reduced by the increase in the flexibility of the secondary barrier 4, 41b, 42b, but also the hull deformation absorption of the secondary barrier 4, 41b, 42b can become easy, and the low-temperature stress can be further reduced.

[0154] Figure 5 is a cross-sectional view of a corner portion of a liquefied gas storage tank of a second embodiment of the present application for illustrating the second embodiment of the present application, Figure 6 is a graph showing a structure analysis result of a corner portion of a liquefied gas storage tank of the second embodiment of the present application.

[0155] As described above Figure 1 , the planar structure of the liquefied gas storage tank 1 of the present embodiment can be configured by a combination of a plurality of planar blocks, as shown in Figure 5 , the corner structure of the liquefied gas storage tank 1 can be configured by a combination of a plurality of corner blocks. Such a plurality of planar blocks can be connected to a plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0156] In the liquefied gas storage tank 1 of the present embodiment, the structure of the planar block is the same as or similar to that described above with reference to Figure 1 . That is, as shown in Figure 1 , the planar block of the liquefied gas storage tank 1 of the present embodiment is disposed at a flat portion of a first face or a second face having different angles from each other that forms a storage space in which a liquefied gas is accommodated, and can include: a planar primary thermal insulation wall 3a that fixes a planar primary barrier 2a of a metal material and is disposed at an outer side of the planar primary barrier 2a; a planar secondary barrier 41a that is provided at an outer side of the planar primary thermal insulation wall 3a; and a planar secondary thermal insulation wall 5a that is disposed at an outer side of the planar secondary barrier 41a.

[0157] Thus, in order to avoid repetitive explanation, specific explanation of the planar block structure of the liquefied gas storage tank 1 will be omitted. Hereinafter, specific explanation will be made mainly on the structure of the corner block of the liquefied gas storage tank 1 of the present embodiment. Figure 1 and Figure 5

[0158] As Figure 1 and Figure 5 , the liquefied gas storage tank 1 can include a primary barrier 2 which contacts with the liquefied gas, a primary insulation wall 3 which is provided outside the primary barrier 2, a secondary barrier 4 which is provided outside the primary insulation wall 3, and a secondary insulation wall 5 which is provided outside the secondary barrier 4. The liquefied gas storage tank 1 can be supported on the ship body 7 by means of the adhesive 6 which is provided between the secondary insulation wall 5 and the ship body 7.

[0159] In this case, the primary barrier 2 can be composed of a planar primary barrier 2a of the planar block and a corner primary barrier 2b of the corner block, the primary insulation wall 3 can be composed of a planar primary insulation wall 3a of the planar block and a corner primary insulation wall 3b of the corner block, the secondary barrier 4 can be composed of a planar secondary barrier 41a of the planar block and a corner secondary barrier 41b of the corner block, and the secondary insulation wall 5 can be composed of a planar secondary insulation wall 5a of the planar block and a corner secondary insulation wall 5b of the corner block. In the case of the present embodiment, as explained in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 can be the same or similar in the planar block and the corner block.

[0160] In this case, the secondary barrier 4 of the planar block and the corner block can include a planar connecting barrier 42a which connects the planar secondary barriers 41a which are adjacently arranged or a corner connecting barrier 42b which connects the corner secondary barriers 41b which are adjacently arranged.

[0161] As Figure 5 indicated, the corner portion of the liquefied gas storage tank 1 of the second embodiment of the present application can be composed of a combination of a plurality of corner blocks. The corner structure of the liquefied gas storage tank 1 which will be explained hereinafter can be an obtuse angle corner structure which forms an angle of a predetermined angle, for example, 135 degrees.

[0162] The corner block of the liquefied gas storage tank 1 is arranged at a corner portion where a first face and a second face which have different angles from each other meet to form a storage space which accommodates the liquefied gas, and can include a corner primary insulation wall 3b which fixes a corner primary barrier 2b of a metal material and is arranged outside the corner primary barrier 2b, a corner secondary barrier 41b which is arranged outside the corner primary insulation wall 3b, and a corner secondary insulation wall 5b which is arranged outside the corner secondary barrier 41b.

[0163] ​The corner primary barrier 2b can be disposed at a corner portion where the first surface or the second surface having different angles from each other meet and form a storage space for storing a liquefied gas as a cryogenic substance, and can be made of a metal material. The corner primary barrier 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary barrier 41b.

[0164] The corner primary barrier 2b of the present embodiment is basically the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted. Note that, in the corner primary barrier 2b of the present embodiment, the angle at which the corner primary thermal insulation wall 3b is bent can be different from that of the first embodiment, since the structure of the corner primary thermal insulation wall 3b is different from that of the first embodiment. In this regard, the description will be made when the corner primary thermal insulation wall 3b is described.

[0165] The corner primary thermal insulation wall 3b is designed to block heat intrusion from the outside and to be able to withstand an impact from the outside or an impact caused by shaking of the liquefied gas inside, and is disposed between the corner primary barrier 2b and the corner secondary barrier 41b. The structure of the corner primary thermal insulation wall 3b of the present embodiment is the same as or similar to that of the first embodiment described above, except that the structure of the portion in which the inner bent portion 3b3 is constituted by the filled thermal insulation member 3b31 is different from that of the first embodiment, and the outer side primary clamping plate 33b is omitted. Here, the structure that is different will be mainly described.

[0166] The corner primary thermal insulation wall 3b is disposed at the inner side of the first surface and the second surface, respectively, and can include an inner side first fixing portion 3b1 and an inner side second fixing portion 3b2, which are constituted by the structure in which the inner side primary clamping plate 31b and the corner primary thermal insulation member 32b are sequentially stacked toward the outer side of the corner primary barrier 2b. Here, the inner side primary clamping plate 31b and the corner primary thermal insulation member 32b of the present embodiment are the same as or similar to those of the first embodiment described above, and thus a detailed description thereof will be omitted in order to avoid redundant description.

[0167] The inner side first fixing portion 3b1 can be fixed to the outer side first fixing portion 5b1 and disposed at the inner side of the first surface, and the inner side second fixing portion 3b2 can be fixed to the outer side second fixing portion 5b2 and disposed at the inner side of the second surface.

[0168] In addition, the corner primary thermal insulation wall 3b can include an inner side intermediate fixing portion 3b12 disposed between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2.

[0169] The inner side intermediate fixing portion 3b12 can include a corner intermediate thermal insulation member 32b12 fixed to the corner connection barrier 42b connecting adjacent corner secondary barriers 41b, and an inner side intermediate clamping plate 31b12 disposed at the inner side of the corner intermediate thermal insulation member 32b12 and fixing the corner primary barrier 2b.

[0170] The inner middle gusset 31b12 can be formed in the same or similar structure as the inner primary gusset 31b, and can be fixed to the inner primary gusset 31b.

[0171] In the case of equally dividing the corner portion, such an inner middle gusset 31b12 can be parallel to a direction perpendicular to the equally dividing direction ED. Note that in the case of unequally dividing the corner portion, the inner middle gusset 31b12 can not be parallel to a direction perpendicular to the dividing direction ED of the corner portion.

[0172] The corner middle thermal insulation member 32b12 can be formed of the same or similar material as the corner primary thermal insulation member 32b. The corner middle thermal insulation member 32b12 can be formed of high-density polyurethane foam.

[0173] Such a corner middle thermal insulation member 32b12 can seal a space portion between the outer first fixing portion, the outer second fixing portion 5b1, 5b2, which are adjacently arranged when the plurality of corner blocks are adjacently arranged together with the corner connecting barrier 42b, thereby performing a role of blocking the intrusion of heat from the outside. In the present embodiment, the corner connecting barrier 42b can be extended to overlap not only the inner first fixing portion, the inner second fixing portion 3b1, 3b2, but also at least the length of the inner first fixing portion, the inner second fixing portion 3b1, 3b2.

[0174] The inner middle gusset 31b12 is disposed between the inner first fixing portion 3b1 and the inner second fixing portion 3b2, whereby the corner primary barrier 2b can be fixed to the inner primary gusset 31b of the inner first fixing portion 3b1, the inner middle gusset 31b12 of the inner middle fixing portion 3b12, and the inner primary gusset 31b of the inner second fixing portion 3b2, and can be arranged to be bent at an angle ranging from 150 degrees to 160 degrees between the inner first fixing portion 3b1 and the inner middle fixing portion 3b12 and between the inner middle fixing portion 3b12 and the inner second fixing portion 3b2.

[0175] Thus, in the present embodiment, the inner first fixing portion 3b1 and the inner second fixing portion 3b2, which are disposed at the inner side of the first face and the second face having different angles from each other, are spaced apart by a predetermined interval, and the inner middle fixing portion 3b12 is disposed between the inner first fixing portion 3b1 and the inner second fixing portion 3b2, whereby the angle of bending of the corner primary barrier 2b can be alleviated by the inner middle fixing portion 3b12, thereby not only reducing the burden of the corner primary barrier 2b, but also increasing the mechanical strength of the corner portion.

[0176] The corner secondary prevention wall 41b can be provided between the corner primary insulation wall 3b and the corner secondary insulation wall 5b, and when the corner blocks are adjacently arranged, the corner secondary prevention wall 41b adjacent between the outer side first fixing part, the outer side second fixing part 5b1, 5b2 can be connected by the corner connection prevention wall 42b, and can prevent the liquefied gas from leaking to the outside together with the corner primary prevention wall 2b. The corner secondary prevention wall 41b of the present embodiment is the same as or similar to the first embodiment described above, and the specific description is omitted to avoid repetition.

[0177] The corner secondary insulation wall 5b can include an inner side secondary clamping plate 51b, a corner secondary insulation 52b, and an outer side secondary clamping plate 53b. The corner secondary insulation wall 5b is fixed to the inner side of the first face and the second face, respectively, and can include an outer side first fixing part 5b1 and an outer side second fixing part 5b2, which are sequentially stacked with the inner side secondary clamping plate 51b, the corner secondary insulation 52b, and the outer side secondary clamping plate 53b to the outer side of the corner secondary prevention wall 2b.

[0178] The corner secondary insulation wall 5b of the present embodiment is the same as or similar to the first embodiment described above, and the specific description is omitted to avoid repetition.

[0179] Figure 6 The results of the structural analysis of the YY direction stress value and the temperature distribution of the secondary prevention wall 4, 41b, 42b of the portion bent at the outer side first fixing part, the outer side second fixing part 5b1, 5b2 are shown, and the YY direction stress value is 10.982 MPa and the temperature is -67.914℃. Compared with the case where the YY direction stress value of the portion bent in the secondary prevention wall of the conventional liquefied gas storage tank is about 66.8984 MPa and the temperature is about -135.857℃, the burden in the secondary prevention wall 4, 41b, 42b of the present embodiment is very small, which means that the influence of the cold and heat caused by the extremely low temperature substance such as the damage caused by the low temperature stress in the secondary prevention wall 4, 41b, 42b of the present embodiment is reduced compared with the conventional one.

[0180] Figure 7 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a third embodiment of the present application, Figure 8 is a graph showing the results of the structural analysis of the corner portion of the liquefied gas storage tank of the third embodiment of the present application.

[0181] As described above Figure 1 As shown in Figure 7 As shown in, 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 a plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0182] In the liquefied gas storage tank 1 of this embodiment, the structure of the planar block is consistent with the reference. Figure 1 The aforementioned structures are the same or similar. That is, as... Figure 1 As shown, the planar block of the liquefied gas storage tank 1 in this embodiment is arranged on a flat portion of a first or second surface having different angles from each other in forming a storage space for liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary insulation wall 2a made of fixed metal material and disposed outside the flat primary insulation wall 2a; a flat secondary insulation wall 41a disposed outside the flat primary insulation wall 3a; and a flat secondary insulation wall 5a disposed outside the flat secondary insulation wall 41a.

[0183] Therefore, to avoid repetition, a detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. See below for reference. Figure 1 as well as Figure 7 The specific description will focus on the structure of the corner block of the liquefied gas storage tank 1 in this embodiment.

[0184] like Figure 1 as well as Figure 7 The liquefied gas storage tank 1 may include: a primary shield 2, which is in contact with the liquefied gas; a primary insulation wall 3, which is disposed outside the primary shield 2; a secondary shield 4, which is disposed outside the primary insulation wall 3; and a secondary insulation wall 5, which is disposed outside the secondary shield 4. The liquefied gas storage tank 1 may be supported on the hull 7 by means of an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0185] In this embodiment, the primary heat-insulating wall 2 can be composed of a flat primary heat-insulating wall 2a of a planar block and a corner primary heat-insulating wall 2b of a corner block; the primary heat-insulating wall 3 can be composed of a flat primary heat-insulating wall 3a of a planar block and a corner primary heat-insulating wall 3b of a corner block; the secondary heat-insulating wall 4 can be composed of a flat secondary heat-insulating wall 41a of a planar block and a corner secondary heat-insulating wall 41b of a corner block; and the secondary heat-insulating wall 5 can be composed of a flat secondary heat-insulating wall 5a of a planar block and a corner secondary heat-insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the primary heat-insulating wall 3 and the thickness of the secondary heat-insulating wall 5 in the planar block and corner block can be the same or similar.

[0186] The secondary defense wall 4 of the planar block and the corner block may include a flat connecting defense wall 42a or a corner connecting defense wall 42b. When a plurality of planar blocks or a plurality of corner blocks are arranged adjacently, the flat connecting defense wall 42a is connected to the adjacent flat secondary defense wall 41a, and the corner connecting defense wall 42b is connected to the adjacent corner secondary defense wall 41b.

[0187] like Figure 7As shown, the corner portion of the liquefied gas storage tank 1 of the third embodiment of the present application can be constructed 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 angle corner structure that constitutes an angle of a predetermined angle, for example, 135 degrees.

[0188] In this embodiment, the position of the corner primary insulation wall 3b can be positioned in a manner that the corner secondary prevention wall 41b constructed on the corner secondary insulation wall 5b is exposed from the corner center portion. Accordingly, the exposed corner secondary prevention wall 41b can be connected to each other to complete the construction by the corner connection prevention wall 42b, or the corner connection prevention wall 42b is constructed in a manner that the corner primary insulation wall 3b connects the corner secondary prevention wall 41b adjacently arranged, and is stacked above the corner secondary prevention wall 41b / corner connection prevention wall 42b. In this embodiment, the corner connection prevention wall 42b can be extended to overlap not only between the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2, but also at least the length of the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2.

[0189] The corner block of the liquefied gas storage tank 1 is arranged at a corner portion where a first face and a second face having different angles from each other meet to form a storage space that accommodates a liquefied gas, and can include a corner primary insulation wall 3b that fixes a corner primary prevention wall 2b of a metal material and is arranged outside the corner primary prevention wall 2b, a corner secondary prevention wall 41b that is arranged outside the corner primary insulation wall 3b, and a corner secondary insulation wall 5b that is arranged outside the corner secondary prevention wall 41b.

[0190] The corner primary prevention wall 2b can be arranged at a corner portion where a first face or a second face having different angles from each other meet to form an accommodation space that accommodates a liquefied gas as a cryogenic material, and is composed of a metal material. The corner primary prevention wall 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary prevention wall 41b.

[0191] The corner primary prevention wall 2b of this embodiment is basically the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted.

[0192] The corner primary insulation wall 3b is designed to block heat intrusion from the outside and to be able to withstand an impact from the outside or an impact caused by the liquefied gas shaking inside, and is arranged between the corner primary prevention wall 2b and the corner secondary prevention wall 41b. The structure of the corner primary insulation wall 3b of this embodiment is the same as or similar to the first embodiment described above, except that the outer side first clamping plate 33b is omitted, and thus a description will be mainly given to the structure that becomes different.

[0193] The corner primary heat insulation wall 3b is arranged on the inner side of the first face and the second face, and can include an inner side first fixing part 3b1 and an inner side second fixing part 3b2, which are sequentially stacked with an inner side primary clamping plate 31b and a corner primary heat insulation piece 32b towards the outer side of the corner primary prevention wall 2b. The inner side primary clamping plate 31b and the corner primary heat insulation piece 32b of the present embodiment are the same as or similar to those of the first embodiment, and thus the specific description is omitted to avoid repetition.

[0194] The inner side first fixing part 3b1 can be fixed to the outer side first fixing part 5b1 and arranged on the inner side of the first face, and the inner side second fixing part 3b2 can be fixed to the outer side second fixing part 5b2 and arranged on the inner side of the second face.

[0195] In addition, the corner primary heat insulation wall 3b can include an inner side bending part 3b3, which is formed by filling the heat insulation piece 3b32 between the inner side first fixing part 3b1 and the inner side second fixing part 3b2. The heat insulation piece 3b32 of the inner side bending part 3b3 of the present embodiment can be the same as or similar to that of the first embodiment, and thus the specific description is omitted to avoid repetition.

[0196] The corner secondary prevention wall 41b can be arranged between the corner primary heat insulation wall 3b and the corner secondary heat insulation wall 5b, and when the corner blocks are adjacently arranged, the corner secondary prevention wall 41b adjacent to the outer side first fixing part 5b1 and the outer side second fixing part 5b2 can be connected by a corner connecting prevention wall 42b, and can prevent the liquefied gas from leaking to the outside together with the corner primary prevention wall 2b. The basic structure of the corner secondary prevention wall 41b of the present embodiment can be the same as or similar to that of the first embodiment. It should be noted that since the partial structure of the corner secondary heat insulation wall 5b is different from that of the first embodiment, the arrangement relationship of the corner secondary prevention wall 41b including the corner connecting prevention wall 42b of the present embodiment can be different, and the following description will be made when the corner secondary heat insulation wall 5b is described.

[0197] The corner secondary heat insulation wall 5b can include an inner side secondary clamping plate 51b, a corner secondary heat insulation piece 52b, and an outer side secondary clamping plate 53b. The corner secondary heat insulation wall 5b is arranged on the inner side of the first face and the second face, and can include an outer side first fixing part 5b1 and an outer side second fixing part 5b2, which are sequentially stacked with the inner side secondary clamping plate 51b, the corner secondary heat insulation piece 52b, and the outer side secondary clamping plate 53b towards the outer side of the corner secondary prevention wall 2b.

[0198] The side surfaces of the outer side first fixing part 5b1 and the outer side second fixing part 5b2 facing each other can be arranged to be inclined in the direction ED of equally dividing the corner part. Although the case of equally dividing the corner part is described in the present embodiment, it is not limited thereto, and the corner part can be unequally divided according to the position of the corner, and thus it is also possible to be arranged to be inclined in the direction ED of unequally dividing the corner part.

[0199] The outer first fixing part 5b1 and the outer second fixing part 5b2 can be formed with a cavity at the corner facing each other.

[0200] Further, the corner secondary insulation wall 5b can include an outer bending part 5b3 including an insulation 5b31 filled between the cavity portions of the outer first fixing part 5b1 and the outer second fixing part 5b2. The insulation 5b31 of the outer bending part 5b3 can be a low-density polyurethane foam.

[0201] By providing the insulation 5b31 of the outer bending part 5b3 at the cavity portions of the outer first fixing part 5b1 and the outer second fixing part 5b2, the corner secondary barrier 41b including the corner connection barrier 42b can be fixed to the inner secondary clamping plate 51b of the outer first fixing part 5b1, the insulation 5b31 of the outer bending part 5b3, and the inner secondary clamping plate 51b of the outer second fixing part 5b2, and can be configured to be bent at a predetermined angle, for example, an angle of 135 degrees, inside the insulation 5b31 of the outer bending part 5b3.

[0202] Thus, in the present embodiment, a cavity is formed at the corner facing each other of the outer first fixing part 5b1 and the outer second fixing part 5b2 having first and second faces having different angles from each other, and the insulation 5b31 of the outer bending part 5b3 composed of a low-density polyurethane foam is provided at the cavity, whereby the thermal insulation performance of the corner portion can be further increased using the low-density polyurethane foam.

[0203] Figure 8 The results of the structural analysis of the YY direction stress value and the temperature distribution of the secondary barrier 4, 41b, 42b at the portion bent at the outer first fixing part, the outer second fixing part 5b1, 5b2 facing each other are shown, and the YY direction stress value is 12.003 MPa and the temperature is -64.358℃. Such values are compared with the case where the YY direction stress value of the portion bent in the secondary barrier of the conventional liquefied gas storage tank is about 66.8984 MPa and the temperature is about -135.857℃, and the burden in the secondary barrier 4, 41b, 42b of the present embodiment is very small, which means that the influence of the cold and heat caused by the extremely low temperature substance such as damage due to low temperature stress in the secondary barrier 4, 41b, 42b of the present embodiment is reduced compared to the conventional.

[0204] Figure 9 is a cross-sectional view for explaining a corner portion of a liquefied gas storage tank of a fourth embodiment of the present application, Figure 10 is a graph showing the results of the structural analysis of the corner portion of the liquefied gas storage tank of the fourth embodiment of the present application.

[0205] As described above Figure 1As shown, the planar structure of the liquefied gas storage tank 1 in this embodiment can be constructed by a combination of multiple planar blocks, such as... Figure 9 As shown, the corner structure of the liquefied gas storage tank 1 can be constructed by combining a plurality of corner blocks. Such a plurality of planar blocks can be connected to the corner portions of the liquefied gas storage tank 1.

[0206] In the liquefied gas storage tank 1 of this embodiment, the structure of the planar block is consistent with the reference. Figure 1 The aforementioned structures are the same or similar. That is, as... Figure 1 As shown, the planar block of the liquefied gas storage tank 1 in this embodiment is arranged on a flat portion of a first or second surface having different angles from each other in forming a storage space for liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary insulation wall 2a made of fixed metal material and disposed outside the flat primary insulation wall 2a; a flat secondary insulation wall 41a disposed outside the flat primary insulation wall 3a; and a flat secondary insulation wall 5a disposed outside the flat secondary insulation wall 41a.

[0207] Therefore, to avoid repetition, a detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. See below for reference. Figure 1 as well as Figure 9 The specific description will focus on the structure of the corner block of the liquefied gas storage tank 1 in this embodiment.

[0208] like Figure 1 as well as Figure 9 The liquefied gas storage tank 1 may include: a primary shield 2, which is in contact with the liquefied gas; a primary insulation wall 3, which is disposed outside the primary shield 2; a secondary shield 4, which is disposed outside the primary insulation wall 3; and a secondary insulation wall 5, which is disposed outside the secondary shield 4. The liquefied gas storage tank 1 may be supported on the hull 7 by means of an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0209] In this embodiment, the primary heat-insulating wall 2 can be composed of a flat primary heat-insulating wall 2a of a planar block and a corner primary heat-insulating wall 2b of a corner block; the primary heat-insulating wall 3 can be composed of a flat primary heat-insulating wall 3a of a planar block and a corner primary heat-insulating wall 3b of a corner block; the secondary heat-insulating wall 4 can be composed of a flat secondary heat-insulating wall 41a of a planar block and a corner secondary heat-insulating wall 41b of a corner block; and the secondary heat-insulating wall 5 can be composed of a flat secondary heat-insulating wall 5a of a planar block and a corner secondary heat-insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the primary heat-insulating wall 3 and the thickness of the secondary heat-insulating wall 5 in the planar block and corner block can be the same or similar.

[0210] The secondary barrier 4 of the flat block and the corner block can include a flat connection barrier 42a connecting flat secondary barriers 41a adjacently arranged or a corner connection barrier 42b connecting corner secondary barriers 41b adjacently arranged.

[0211] As shown in FIG. 1, the corner portion of the liquefied gas storage tank 1 according to the fourth embodiment of the present application can be constructed 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 angle corner structure constituting an angle of a predetermined angle, for example, 135 degrees. Figure 9

[0212] In the present embodiment, the corner connection barrier 42b can be extended to overlap not only between the inner first fixing portion and the inner second fixing portion 3b1, 3b2 but also at least the length of the inner first fixing portion and the inner second fixing portion 3b1, 3b2.

[0213] The corner block of the liquefied gas storage tank 1 is arranged at a corner portion where a first face and a second face having different angles from each other meet, forming a storage space in which a liquefied gas is stored, and can include a corner primary insulation wall 3b fixed to a corner primary barrier 2b of a metal material and arranged outside the corner primary barrier 2b, a corner secondary barrier 41b provided outside the corner primary insulation wall 3b, and a corner secondary insulation wall 5b arranged outside the corner secondary barrier 41b.

[0214] The corner primary barrier 2b can be arranged at a corner portion where a first face or a second face having different angles from each other meet, forming a storage space in which a liquefied gas as a cryogenic material is stored, and can be composed of a metal material. The corner primary barrier 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary barrier 41b.

[0215] The corner primary barrier 2b of the present embodiment is basically the same as or similar to the first embodiment described above, and thus a detailed description thereof is omitted.

[0216] ​The corner primary thermal insulation wall 3b is designed to block the invasion of heat from the outside and to withstand the impact from the outside or the impact caused by the shaking of the liquefied gas inside, and is provided between the corner primary protection wall 2b and the corner secondary protection wall 41b. The structure of the corner primary thermal insulation wall 3b of the present embodiment is the same as or similar to that of the aforementioned first embodiment, except that the outer side primary clamping plate 33b is omitted and the structure of the inner side bent portion 3b3 is different, and the different structure will be mainly described here.

[0217] The corner primary thermal insulation wall 3b is provided on the inner side of the first and second surfaces, and can include an inner side first fixing portion 3b1 and an inner side second fixing portion 3b2, which are configured by sequentially stacking the inner side primary clamping plate 31b and the corner primary thermal insulation member 32b toward the outer side of the corner primary protection wall 2b. The inner side primary clamping plate 31b and the corner primary thermal insulation member 32b of the present embodiment are the same as or similar to those of the aforementioned first embodiment, and thus the detailed description is omitted to avoid repetition.

[0218] The inner side first fixing portion 3b1 can be fixed to the outer side first fixing portion 5b1 and provided on the inner side of the first surface, and the inner side second fixing portion 3b2 can be fixed to the outer side second fixing portion 5b2 and provided on the inner side of the second surface.

[0219] In addition, the corner primary thermal insulation wall 3b can include an inner side bent portion 3b3, which is filled between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2 and includes an outer side thermal insulation member 3b33 provided on the corner secondary protection wall 41b including the corner connecting protection wall 42b and an inner side thermal insulation member 3b34 provided between the outer side thermal insulation member 3b33 and the corner primary protection wall 2b.

[0220] The outer side thermal insulation member 3b33 of the inner side bent portion 3b3 can be glass wool, and the outer surface bent at a predetermined angle, for example, an angle of 135 degrees, can be provided with the secondary protection wall 4 in which the corner secondary protection wall 41b and the corner connecting protection wall 42b are stacked.

[0221] The inner side thermal insulation member 3b34 of the inner side bent portion 3b3 can be low-density polyurethane foam, and the inner surface bent at a predetermined angle, for example, an angle of 135 degrees, can be provided with the corner primary protection wall 2b.

[0222] The thickness of each of the outer side thermal insulation member 3b33 and the inner side thermal insulation member 3b34 of the inner side bent portion 3b3 can be freely set.

[0223] The corner secondary prevention wall 41b can be provided between the corner primary insulation wall 3b and the corner secondary insulation wall 5b, and when the corner blocks are adjacently arranged, the corner secondary prevention wall 41b adjacent between the outer side first fixing portion 5b1 and the outer side second fixing portion 5b2 can be connected by the corner connection prevention wall 42b, and can prevent the leakage of the liquefied gas to the outside together with the corner primary prevention wall 2b. The basic structure of the corner secondary prevention wall 41b of the present embodiment can be the same as or similar to that of the first embodiment described above. Note that, as the partial structure of the corner primary insulation wall 3b and the corner secondary insulation wall 5b described above is different from that of the first embodiment described above, the arrangement relationship of the corner secondary prevention wall 41b including the corner connection prevention wall 42b of the present embodiment can be different, and the following will be described when the corner secondary insulation wall 5b is described.

[0224] The corner secondary insulation wall 5b can include an inner side secondary clamping plate 51b, a corner secondary insulation member 52b, and an outer side secondary clamping plate 53b. The corner secondary insulation wall 5b is fixed to the inner side of the first face and the second face, respectively, and can include an outer side first fixing portion 5b1 and an outer side second fixing portion 5b2, and be configured by sequentially stacking the inner side secondary clamping plate 51b, the corner secondary insulation member 52b, and the outer side secondary clamping plate 53b toward the outer side of the corner secondary prevention wall 2b.

[0225] The side surfaces of the outer side first fixing portion 5b1 and the outer side second fixing portion 5b2 facing each other can be configured to be inclined in the direction ED in which the corner portion is equally divided. Although the case where the corner portion is equally divided is described in the present embodiment, it is not limited thereto, and the corner portion can be divided unequally according to the position of the corner, and thus it is also possible to be configured to be inclined in the direction ED in which the corner portion is unequally divided.

[0226] The outer side first fixing portion 5b1 and the outer side second fixing portion 5b2 can be formed with steps at the edges facing each other.

[0227] In addition, the corner secondary insulation wall 5b can include an outer side bending portion 5b3 including an insulation member 5b31 filled between the stepped portions of the outer side first fixing portion 5b1 and the outer side second fixing portion 5b2. The insulation member 5b32 of the outer side bending portion 5b3 can be glass wool of the same material as the outer side insulation member 3b33 of the inner side bending portion 3b3.

[0228] By providing the insulation member 5b32 of the outer side bending portion 5b3 at the stepped portions of the outer side first fixing portion 5b1 and the outer side second fixing portion 5b2, the corner secondary prevention wall 41b including the corner connection prevention wall 42b can be fixed to the inner side secondary clamping plate 51b of the outer side first fixing portion 5b1, the insulation member 5b32 of the outer side bending portion 5b3, and the inner side secondary clamping plate 51b of the outer side second fixing portion 5b2, and can be configured to be bent at a predetermined angle, for example, an angle of 135 degrees, at the inner side of the insulation member 5b32 of the outer side bending portion 5b3.

[0229] Thus, in the present embodiment, a step is formed at the corner where the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are fixed to the first face and the second face having different angles from each other, respectively, face each other, and the heat insulating member 5b32 of the outer bent portion 5b3 composed of glass wool is provided at the step portion, and the outer heat insulating member 3b33 of the inner bent portion 5b3 composed of glass wool is provided across the corner secondary barrier 41b including the corner connecting barrier 42b, whereby the flexibility of the corner secondary barrier 41b including the corner connecting barrier 42b is improved, so that damage to the corner secondary barrier 41b including the corner connecting barrier 42b can be further prevented.

[0230] Figure 10 The results of structural analysis of the YY direction stress value and the temperature distribution of the corner secondary barrier 4, 41b, 42b at the portion bent to face the outer first fixing portion, the outer second fixing portion 5b1, 5b2 are shown, and the YY direction stress value is 12.003 MPa and the temperature is -64.358°C. Such values are compared with the case where the YY direction stress value of the portion bent in the secondary barrier of the conventional liquefied gas storage tank is about 66.8984 MPa and the temperature is about -135.857°C, and the burden on the secondary barrier 4, 41b, 42b of the present embodiment is very small, which means that the influence of the cold and heat caused by the extremely low temperature substance on the damage and the like to the secondary barrier 4, 41b, 42b of the present embodiment due to the low temperature stress is reduced compared to the conventional one.

[0231] Figure 11 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a fifth embodiment of the present application, Figure 12 is a graph showing the results of structural analysis of the corner portion of the liquefied gas storage tank of the fifth embodiment of the present application.

[0232] As shown in the foregoing Figure 1 , the planar structure of the liquefied gas storage tank 1 of the present embodiment can be composed of a combination of a plurality of planar blocks, as shown in Figure 11 , the corner structure of the liquefied gas storage tank 1 can be composed of a combination of a plurality of corner blocks. Such a plurality of planar blocks can be connected to a plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0233] In the liquefied gas storage tank 1 of the present embodiment, the structure of the planar block is the same as or similar to the foregoing structure with reference to Figure 1 . That is, as shown in Figure 1As shown, the planar block of the liquefied gas storage tank 1 in this embodiment is arranged on a flat portion of a first or second surface having different angles from each other in forming a storage space for liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary insulation wall 2a made of fixed metal material and disposed outside the flat primary insulation wall 2a; a flat secondary insulation wall 41a disposed outside the flat primary insulation wall 3a; and a flat secondary insulation wall 5a disposed outside the flat secondary insulation wall 41a.

[0234] Therefore, to avoid repetition, a detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. See below for reference. Figure 1 as well as Figure 11 The specific description will focus on the structure of the corner block of the liquefied gas storage tank 1 in this embodiment.

[0235] like Figure 1 as well as Figure 11 The liquefied gas storage tank 1 may include: a primary shield 2, which is in contact with the liquefied gas; a primary insulation wall 3, which is disposed outside the primary shield 2; a secondary shield 4, which is disposed outside the primary insulation wall 3; and a secondary insulation wall 5, which is disposed outside the secondary shield 4. The liquefied gas storage tank 1 may be supported on the hull 7 by means of an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0236] In this embodiment, the primary heat-insulating wall 2 can be composed of a flat primary heat-insulating wall 2a of a planar block and a corner primary heat-insulating wall 2b of a corner block; the primary heat-insulating wall 3 can be composed of a flat primary heat-insulating wall 3a of a planar block and a corner primary heat-insulating wall 3b of a corner block; the secondary heat-insulating wall 4 can be composed of a flat secondary heat-insulating wall 41a of a planar block and a corner secondary heat-insulating wall 41b of a corner block; and the secondary heat-insulating wall 5 can be composed of a flat secondary heat-insulating wall 5a of a planar block and a corner secondary heat-insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the primary heat-insulating wall 3 and the thickness of the secondary heat-insulating wall 5 in the planar block and corner block can be the same or similar.

[0237] The secondary defense wall 4 of the planar block and the corner block may include a flat connecting defense wall 42a or a corner connecting defense wall 42b. When a plurality of planar blocks or a plurality of corner blocks are arranged adjacently, the flat connecting defense wall 42a is connected to the adjacent flat secondary defense wall 41a, and the corner connecting defense wall 42b is connected to the adjacent corner secondary defense wall 41b.

[0238] like Figure 11 In the fifth embodiment of the present invention, the corner portion of the liquefied gas storage tank 1 can be constructed 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, such as 135 degrees.

[0239] In this embodiment, the position of the corner primary thermal insulation wall 3b can be located in a position in which the corner secondary prevention wall 41b constructed on the corner secondary thermal insulation wall 5b is exposed from the corner center portion in a manner. Thus, the exposed corner secondary prevention wall 41b is connected to each other by the corner connection prevention wall 42b to complete the construction, or the corner connection prevention wall 42b is constructed in a manner in which the corner primary thermal insulation wall 3b connects the corner secondary prevention walls 41b adjacently arranged above the secondary prevention wall 41b / corner connection prevention wall 42b is stacked. In this embodiment, the corner connection prevention wall 42b can be extended to overlap not only between the inner first fixing portion and the inner second fixing portion 3b1, 3b2, but also at least the length of the inner first fixing portion and the inner second fixing portion 3b1, 3b2.

[0240] The corner block of the liquefied gas storage tank 1 is arranged at a corner portion where the first surface and the second surface having different angles from each other meet to form a storage space in which the liquefied gas is accommodated, and can include: a corner primary thermal insulation wall 3b fixed to a corner primary prevention wall 2b of a metal material and arranged outside the corner primary prevention wall 2b; a corner secondary prevention wall 41b arranged outside the corner primary thermal insulation wall 3b; and a corner secondary thermal insulation wall 5b arranged outside the corner secondary prevention wall 41b.

[0241] The corner primary prevention wall 2b can be arranged at a corner portion where the first surface or the second surface having different angles from each other meet to form an accommodation space in which the liquefied gas as a cryogenic material is accommodated, and can be composed of a metal material. The corner primary prevention wall 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary prevention wall 41b.

[0242] The corner primary prevention wall 2b of this embodiment is basically the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted.

[0243] The corner primary thermal insulation wall 3b is designed to block heat intrusion from the outside and to be able to withstand impact from the outside or impact caused by the liquefied gas shaking inside, and is arranged between the corner primary prevention wall 2b and the corner secondary prevention wall 41b. The structure of the corner primary thermal insulation wall 3b of this embodiment is the same as or similar to the first embodiment described above, except that the outer primary clamping plate 33b is omitted, and thus a description will be mainly given to the structure that is different.

[0244] The corner primary thermal insulation wall 3b is arranged at the inner side of the first surface and the second surface, respectively, and can include: an inner first fixing portion 3b1 and an inner second fixing portion 3b2, which are composed of an inner primary clamping plate 31b and a corner primary thermal insulation member 32b stacked in order outside the corner primary prevention wall 2b. In this embodiment, the inner primary clamping plate 31b and the corner primary thermal insulation member 32b are the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted in order to avoid repetition.

[0245] The inner first fixing part 3b1 can be fixed to the outer first fixing part 5b1 and disposed on the inner side of the first face, and the inner second fixing part 3b2 can be fixed to the outer second fixing part 5b2 and disposed on the inner side of the second face.

[0246] In addition, the corner primary thermal insulation wall 3b can include an inner corner bending part 3b3, which is configured by filling the thermal insulation member 3b35 between the inner first fixing part 3b1 and the inner second fixing part 3b2. The thermal insulation member 3b35 of the inner corner bending part 3b3 of the present embodiment can be the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted to avoid repetition.

[0247] The corner secondary prevention wall 41b can be disposed between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and when the corner blocks are adjacently arranged, the corner secondary prevention wall 41b adjacent between the outer first fixing part and the outer second fixing part 5b1, 5b2 can be connected by the corner connection prevention wall 42b and can prevent the leakage of the liquefied gas to the outside together with the corner primary prevention wall 2b. The basic structure of the corner secondary prevention wall 41b of the present embodiment is the same as or similar to the first embodiment described above. It should be noted that, as the partial structure of the corner secondary thermal insulation wall 5b is different from the first embodiment described above, the arrangement relationship of the corner secondary prevention wall 41b including the corner connection prevention wall 42b of the present embodiment can be different, and the following will be described when the corner secondary thermal insulation wall 5b is described.

[0248] The corner secondary thermal insulation wall 5b can include an inner secondary clamping plate 51b, a corner secondary thermal insulation member 52b, and an outer secondary clamping plate 53b. The corner secondary thermal insulation wall 5b is fixed to the inner side of the first face and the second face, and can include an outer first fixing part 5b1 and an outer second fixing part 5b2, which are configured by sequentially stacking the inner secondary clamping plate 51b, the corner secondary thermal insulation member 52b, and the outer secondary clamping plate 53b from the outer side of the corner secondary prevention wall 2b.

[0249] The inner first fixing part 3b1 can be fixed to the outer first fixing part 5b1 and disposed on the inner side of the first face, and the inner second fixing part 3b2 can be fixed to the outer second fixing part 5b2 and disposed on the inner side of the second face.

[0250] In addition, the corner secondary thermal insulation wall 5b can include an outer intermediate fixing part 5b12 disposed between the outer first fixing part 5b1 and the outer second fixing part 5b2, and a bending part of the corner secondary prevention wall 41b including the corner connection prevention wall 42b is disposed in the outer intermediate fixing part 5b12.

[0251] The outer middle fixing part 5b12 can include an outer middle clamping plate 51b12 fixed to the first surface and the second surface, respectively, an outer middle thermal insulation member 52b12 disposed inside the outer middle clamping plate 51b12, and an inner middle thermal insulation member 53b12 disposed inside the outer middle thermal insulation member 52b12, in which a bent portion of the corner secondary barrier 41b of the corner connecting barrier 42b is disposed inside the inner middle thermal insulation member 53b12.

[0252] The outer middle clamping plate 51b12 is located on the same line as the inner secondary clamping plate 51b and can have the same configuration.

[0253] The outer middle thermal insulation member 52b12 can be polyurethane foam.

[0254] The inner middle thermal insulation member 53b12 can be glass wool.

[0255] By providing the outer middle fixing part 5b12 having the outer middle clamping plate 51b12, the outer middle thermal insulation member 52b12, and the inner middle thermal insulation member 53b12 stacked between the outer first fixing part 5b1 and the outer second fixing part 5b2, the corner secondary barrier 41b including the corner connecting barrier 42b can be fixed to the inner secondary clamping plate 51b of the outer first fixing part 5b1, the inner middle thermal insulation member 53b12 of the outer middle fixing part 5b12, and the inner secondary clamping plate 51b of the outer second fixing part 5b2, and can be bent at a predetermined angle, for example, an angle of 135 degrees, inside the inner middle thermal insulation member 53b12 of the outer middle fixing part 5b12.

[0256] Thus, in the present embodiment, the outer middle fixing part 5b12 is provided between the outer first fixing part 5b1 and the outer second fixing part 5b2 fixed to the first surface and the second surface having different angles from each other, and the flexibility of the corner secondary barrier 41b including the corner connecting barrier 42b formed on the upper portion of the inner middle thermal insulation member 53b12 of the outer middle fixing part 5b12 composed of glass wool is improved, thereby further preventing damage to the corner secondary barrier 41b including the corner connecting barrier 42b.

[0257] Further, in the present embodiment, the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are fixed to the first face and the second face having different angles from each other, are spaced apart by a predetermined interval, and an outer intermediate fixing portion 5b12 is provided between the outer first fixing portion 5b1, the outer second fixing portion 5b2, and the outer intermediate fixing portion 5b12. Thus, in the outer fixing portions 5b1, 5b2, 5b12 of the present embodiment having two 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, respectively, the stress due to shrinkage or expansion caused by temperature is alleviated, compared to the outer fixing portion of the related art having one gap. Therefore, damage to the corner secondary barrier 41b including the corner connection barrier 42b fixed to the outer fixing portions 5b1, 5b2, 5b12 can be prevented.

[0258] Figure 12 The results of structural analysis of the YY direction stress value and the temperature distribution of the secondary barrier 4, 41b, 42b at the bent portion of the outer first fixing portion, the outer second fixing portion 5b1, 5b2 facing each other are shown. The YY direction stress value is 13.101 MPa, and the temperature is -74.480°C. Such values are compared with the case where the YY direction stress value of the bent portion of the secondary barrier of the related art liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857°C. In the secondary barrier 4, 41b, 42b of the present embodiment, the burden is very small, which means that the influence of the cold and heat caused by the extremely low temperature substance, such as damage to the secondary barrier 4, 41b, 42b of the present embodiment due to low temperature stress, is reduced compared to the related art.

[0259] Figure 13 is a cross-sectional view for illustrating a corner portion of a liquefied gas storage tank of a sixth embodiment of the present application, Figure 14 is a graph showing the results of structural analysis of the corner portion of the liquefied gas storage tank of the sixth embodiment of the present application.

[0260] As described above Figure 1 , the planar structure of the liquefied gas storage tank 1 of the present embodiment is composed of a combination of a plurality of planar blocks, as shown in Figure 13 , the corner structure of the liquefied gas storage tank 1 is composed of a combination of a plurality of corner blocks. Such a plurality of planar blocks can be connected to a plurality of corner blocks at the corner portion of the liquefied gas storage tank 1.

[0261] In the liquefied gas storage tank 1 of the present embodiment, the structure of the planar blocks is the same as or similar to the structure described with reference to Figure 1 . That is, as shown in Figure 1As shown, the planar block of the liquefied gas storage tank 1 in this embodiment is arranged on a flat portion of a first or second surface having different angles from each other in forming a storage space for liquefied gas, and may include: a flat primary insulation wall 3a, a flat primary insulation wall 2a made of fixed metal material and disposed outside the flat primary insulation wall 2a; a flat secondary insulation wall 41a disposed outside the flat primary insulation wall 3a; and a flat secondary insulation wall 5a disposed outside the flat secondary insulation wall 41a.

[0262] Therefore, to avoid repetition, a detailed description of the planar block structure of the liquefied gas storage tank 1 will be omitted. See below for reference. Figure 1 as well as Figure 13 The specific description will focus on the structure of the corner block of the liquefied gas storage tank 1 in this embodiment.

[0263] like Figure 1 as well as Figure 13 The liquefied gas storage tank 1 may include: a primary shield 2, which is in contact with the liquefied gas; a primary insulation wall 3, which is disposed outside the primary shield 2; a secondary shield 4, which is disposed outside the primary insulation wall 3; and a secondary insulation wall 5, which is disposed outside the secondary shield 4. The liquefied gas storage tank 1 may be supported on the hull 7 by means of an adhesive 6 disposed between the secondary insulation wall 5 and the hull 7.

[0264] In this embodiment, the primary heat-insulating wall 2 can be composed of a flat primary heat-insulating wall 2a of a planar block and a corner primary heat-insulating wall 2b of a corner block; the primary heat-insulating wall 3 can be composed of a flat primary heat-insulating wall 3a of a planar block and a corner primary heat-insulating wall 3b of a corner block; the secondary heat-insulating wall 4 can be composed of a flat secondary heat-insulating wall 41a of a planar block and a corner secondary heat-insulating wall 41b of a corner block; and the secondary heat-insulating wall 5 can be composed of a flat secondary heat-insulating wall 5a of a planar block and a corner secondary heat-insulating wall 5b of a corner block. In this embodiment, as described in the first embodiment, the thickness of the primary heat-insulating wall 3 and the thickness of the secondary heat-insulating wall 5 in the planar block and corner block can be the same or similar.

[0265] The secondary defense wall 4 of the planar block and the corner block may include a flat connecting defense wall 42a or a corner connecting defense wall 42b. When a plurality of planar blocks or a plurality of corner blocks are arranged adjacently, the flat connecting defense wall 42a is connected to the adjacent flat secondary defense wall 41a, and the corner connecting defense wall 42b is connected to the adjacent corner secondary defense wall 41b.

[0266] like Figure 13 As shown, the corner portion of the liquefied gas storage tank 1 according to the sixth embodiment of the present invention can be constructed 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, such as 135 degrees.

[0267] The corner block of the liquefied gas storage tank 1 is disposed at a corner portion where the first face and the second face having different angles from each other meet, forms a storage space in which the liquefied gas is stored, and can include: a corner primary thermal insulation wall 3b, a corner primary prevention wall 2b of a metal material is fixed, and is disposed outside the corner primary prevention wall 2b; a corner secondary prevention wall 41b disposed outside the corner primary thermal insulation wall 3b; and a corner secondary thermal insulation wall 5b disposed outside the corner secondary prevention wall 41b.

[0268] The corner primary prevention wall 2b can be disposed at a corner portion where the first face or the second face having different angles from each other meet, form a storage space in which the liquefied gas as a cryogenic material is stored, and be composed of a metal material. The corner primary prevention wall 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary prevention wall 41b.

[0269] The corner primary prevention wall 2b of the present embodiment is basically the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted.

[0270] The corner primary thermal insulation wall 3b is designed to block the invasion of heat from the outside and to be able to withstand the impact from the outside or the impact caused by the shaking of the liquefied gas inside, and is disposed between the corner primary prevention wall 2b and the corner secondary prevention wall 41b. The structure of the corner primary thermal insulation wall 3b of the present embodiment is the same as or similar to the first embodiment described above, except that the outer side first clamping plate 33b is omitted and the outer surface shape of the thermal insulation member 3b31 of the inner side bent portion 3b3 is different, and thus a description will be mainly given to the structure that is different.

[0271] The corner primary thermal insulation wall 3b is disposed at the inner side of the first face and the second face, respectively, and can include: an inner side first fixing portion 3b1 and an inner side second fixing portion 3b2, which are composed of the structure in which the inner side primary clamping plate 31b and the corner primary thermal insulation member 32b are sequentially stacked toward the outside of the corner primary prevention wall 2b. The inner side primary clamping plate 31b and the corner primary thermal insulation member 32b of the present embodiment are the same as or similar to the first embodiment described above, and thus a detailed description thereof will be omitted in order to avoid repetitive description.

[0272] The inner side first fixing portion 3b1 can be fixed to the outer side first fixing portion 5b1 and disposed at the inner side of the first face, and the inner side second fixing portion 3b2 can be fixed to the outer side second fixing portion 5b2 and disposed at the inner side of the second face.

[0273] Further, the corner primary thermal insulation wall 3b can include an inner side bent portion 3b3 configured by filling the thermal insulation member 3b36 between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2. The thermal insulation member 3b36 of the inner side bent portion 3b3 of the present embodiment can be the same as or similar to the first embodiment described above. Note that, as the structures of the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2 are different, the shape of the outer surface of the thermal insulation member 3b36 of the inner side bent portion 3b3 of the present embodiment can vary.

[0274] That is, the thermal insulation member 3b36 of the inner side bent portion 3b3 of the present embodiment is formed with a cavity at the corner where the outer side first fixing portion 5b1 and the outer side second fixing portion 5b2 face each other, and thus has a shape in which the outer surface thereof protrudes more outward than the inner side first fixing portion 3b1 or the inner side second fixing portion 3b2.

[0275] The corner secondary prevention wall 41b can be provided between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and the corner secondary prevention wall 41b adjacent between the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2 can be connected by the corner connection prevention wall 42b when the corner blocks are adjacently arranged, and can prevent the leakage of the liquefied gas to the outside together with the corner primary prevention wall 2b. In the present embodiment, the corner connection prevention wall 42b can be extended to overlap not only between the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2 but also at least the length of the inner side first fixing portion and the inner side second fixing portion 3b1, 3b2.

[0276] The basic structure of the corner secondary prevention wall 41b of the present embodiment is the same as or similar to the first embodiment described above. Note that, as the partial structure of the corner secondary thermal insulation wall 5b is different from the first embodiment described above, the arrangement relationship of the corner secondary prevention wall 41b including the corner connection prevention wall 42b of the present embodiment can be different, and the following description will be made when the corner secondary thermal insulation wall 5b is described.

[0277] The corner secondary thermal insulation wall 5b can include an inner side secondary clamping plate 51b, a corner secondary thermal insulation member 52b, and an outer side secondary clamping plate 53b. The corner secondary thermal insulation wall 5b is fixed to the inner side of the first face and the second face, and can include an outer side first fixing portion 5b1 and an outer side second fixing portion 5b2, and is configured by sequentially stacking the inner side secondary clamping plate 51b, the corner secondary thermal insulation member 52b, and the outer side secondary clamping plate 53b toward the outer side of the corner secondary prevention wall 2b.

[0278] The side surfaces of the outer first fixing part 5b1 and the outer second fixing part 5b2 facing each other can be configured to be inclined in a direction ED in which the corner portion is equally divided. Although the case in which the corner portion is equally divided is described in the present embodiment, the corner portion can be divided unequally according to the corner position, and thus it is also possible to be configured to be inclined in a direction ED in which the corner portion is unequally divided.

[0279] The outer first fixing part 5b1 and the outer second fixing part 5b2 can be formed with a chamber at the side corner facing each other.

[0280] In the present embodiment, the inner secondary clamping plate 51b can include a peripheral clamping plate 51b1 fixed to the corner secondary thermal insulator 52b in parallel with the outer secondary clamping plate 53b, and an inclined clamping plate 51b2 connected to the peripheral clamping plate 51b1 and fixed to the corner secondary thermal insulator 52b of the chamber portion. Thus, unlike the first embodiment described above, the corner primary thermal insulator 32b can be provided on the peripheral clamping plate 51b1, and the thermal insulator 3b36 of the inner bent portion 3b3 can be provided on the inclined clamping plate 51b2.

[0281] By providing the inclined clamping plate 51b2 and the thermal insulator 3b36 of the inner bent portion 3b3 at the chamber portion of the outer first fixing part 5b1 and the outer second fixing part 5b2, the corner secondary barrier 41b including the corner connection barrier 42b can be fixed to the peripheral clamping plate 51b1 of the outer first fixing part 5b1, the inclined clamping plate 5b2 of the outer first fixing part 5b1, the inclined clamping plate 5b2 of the outer second fixing part 5b2, and the peripheral clamping plate 51b1 of the outer second fixing part 5b2.

[0282] Further, the corner secondary barrier 41b including the corner connection barrier 42b can be bent in a manner protruding outwardly of the outer side, so as to be disposed at the chamber portion of the outer first fixing part 5b1 and the outer second fixing part 5b2.

[0283] That is, the corner secondary barrier 41b including the corner connection barrier 42b can be configured to be bent outwardly of the outer side 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, to be bent inwardly of the outer side 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 to be bent outwardly of the outer side 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.

[0284] Thus, in the present embodiment, a cavity is formed at the corner where the outer first fixing portion 5b1 and the outer second fixing portion 5b2, which are fixed to the first face and the second face having different angles from each other, respectively, face each other, and the corner secondary barrier 41b including the corner connecting barrier 42b is provided on the surface of the outer first fixing portion, the outer second fixing portion 5b1, 5b2 including the cavity portion, whereby the corner secondary barrier 41b including the corner connecting barrier 42b is bent outwardly, so that the length of the portion not bonded to the corner secondary barrier 5b is increased, not only the damage probability of the corner secondary barrier 41b including the corner connecting barrier 42b can be further reduced by the increase in the flexibility of the corner secondary barrier 41b including the corner connecting barrier 42b, but also the hull deformation absorption of the corner secondary barrier 41b including the corner connecting barrier 42b becomes easy, and the low-temperature stress can be further reduced.

[0285] Figure 14 The results of the structural analysis of the YY direction stress value and the temperature distribution of the secondary barrier 4, 41b, 42b at the portion bent at the outer first fixing portion, the outer second fixing portion 5b1, 5b2 facing each other are shown, the YY direction stress value is 7.197 MPa, and the temperature is -53.710°C. Such values are compared with the case where the YY direction stress value of the portion bent in the secondary barrier of the conventional liquefied gas storage tank is about 66.8984 MPa, and the temperature is about -135.857°C, the burden in the secondary barrier 4, 41b, 42b of the present embodiment is very small, which means that the influence of the cold and heat caused by the extremely low-temperature substance on the damage and the like of the secondary barrier 4, 41b, 42b of the present embodiment due to the low-temperature stress is reduced compared to the conventional one.

[0286] Figure 15 is a cross-sectional view of a corner portion of a liquefied gas storage tank for explaining a seventh embodiment of the present application, Figure 16 is a graph showing the results of the structural analysis of the corner portion of the liquefied gas storage tank of the seventh embodiment of the present application.

[0287] As Figure 15 , the liquefied gas storage tank 1 of the present embodiment can be the same or similar to the liquefied gas storage tank 1 of the first embodiment described above except for the structure of the inner bent portion 3b3, whereby, for the same structure, the specific description is omitted in order to avoid the repeated explanation, and the description is mainly made on the structure which becomes different.

[0288] The structure of the corner primary barrier 3b of the present embodiment is the same or similar to that of the first embodiment described above except for the structure of the portion where the inner bent portion 3b3 composed of the filled barrier 3b31 is arranged, and here, the description is mainly made on the structure which becomes different.

[0289] The corner primary thermal insulation wall 3b of the present embodiment can include a vacuum thermal insulation panel 3b37 filled in the inner side bent portion 3b3 between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2.

[0290] In the present embodiment, the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2 are non-structural members, and thus the construction of the vacuum thermal insulation panel 3b37 as a structural member is easily performed between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2. The vacuum thermal insulation panel 3b37 has excellent thermal insulation performance among various thermal insulation members such as polyurethane foam, and thus the thermal insulation performance in the corner portion can be improved.

[0291] Figure 16 The results of the structural analysis of the YY direction stress value and the temperature distribution of the secondary prevention wall 4, 41b, 42b in the portion in which the outer side first fixing portion and the outer side second fixing portion 5b1, 5b2 face and are bent are shown, and the YY direction stress value is 12.084 MPa and the temperature is -59.025°C. Such values are compared with the case in which the YY direction stress value of the portion in which the secondary prevention wall of the conventional liquefied gas storage tank is bent is about 66.8984 MPa and the temperature is about -135.857°C, and the burden in the secondary prevention wall 4, 41b, 42b of the present embodiment is very small, which means that the influence of the cold and heat caused by the extremely low temperature substance such as damage due to the low temperature stress in the secondary prevention wall 4, 41b, 42b of the present embodiment is reduced compared to the conventional one.

[0292] Figure 17 is a partial front view for illustrating a corner portion of a liquefied gas storage tank of an eighth embodiment of the present application.

[0293] As described above Figure 1 , the planar structure of the liquefied gas storage tank 1 of the present embodiment is configured by the combination of a plurality of planar blocks, as shown in Figure 17 , the corner structure of the liquefied gas storage tank 1 is configured by the combination of a plurality of corner blocks. Such a plurality of planar blocks can be connected with a plurality of corner blocks in the corner portion of the liquefied gas storage tank 1.

[0294] In the liquefied gas storage tank 1 of the present embodiment, the structure of the planar block is the same as or similar to the structure described with reference to Figure 1 . That is, as shown in Figure 1 , the planar block of the liquefied gas storage tank 1 of the present embodiment is disposed in a flat portion of the first face or the second face having different angles from each other, which forms a storage space in which a liquefied gas is accommodated, and can include a planar primary thermal insulation wall 3a, a planar primary prevention wall 2a of a metal material is fixed, and is disposed outside the planar primary prevention wall 2a, a planar secondary prevention wall 41a provided outside the planar primary thermal insulation wall 3a, and a planar secondary thermal insulation wall 5a disposed outside the planar secondary prevention wall 41a.

[0295] Thus, in order to avoid repetitive explanation, specific explanation of the planar block structure of the liquefied gas storage tank 1 will be omitted. Hereinafter, specific explanation will be made mainly on the structure of the corner block of the liquefied gas storage tank 1 of the present embodiment. Figure 1 Figure 17

[0296] As shown in Figs. 1 and 2, the liquefied gas storage tank 1 can include a primary barrier 2 which contacts with the liquefied gas, a primary insulation wall 3 which is provided outside the primary barrier 2, a secondary barrier 4 which is provided outside the primary insulation wall 3, and a secondary insulation wall 5 which is provided outside the secondary barrier 4. The liquefied gas storage tank 1 can be supported on the ship body 7 by means of the adhesive 6 which is provided between the secondary insulation wall 5 and the ship body 7. Figure 1 Figure 17 The primary barrier 2 can be composed of a planar primary barrier 2a of the planar block and a corner primary barrier 2b of the corner block, the primary insulation wall 3 can be composed of a planar primary insulation wall 3a of the planar block and a corner primary insulation wall 3b of the corner block, the secondary barrier 4 can be composed of a planar secondary barrier 41a of the planar block and a corner secondary barrier 41b of the corner block, and the secondary insulation wall 5 can be composed of a planar secondary insulation wall 5a of the planar block and a corner secondary insulation wall 5b of the corner block. In the case of the present embodiment, as explained in the first embodiment, the thickness of the primary insulation wall 3 and the thickness of the secondary insulation wall 5 can be the same or similar in the planar block and the corner block.

[0297] The secondary barrier 4 of the planar block and the corner block can include a planar connecting barrier 42a which connects the planar secondary barriers 41a which are adjacently arranged or a corner connecting barrier 42b which connects the corner secondary barriers 41b which are adjacently arranged.

[0298] The secondary barrier 4 of the planar block and the corner block can include a planar connecting barrier 42a which connects the planar secondary barriers 41a which are adjacently arranged or a corner connecting barrier 42b which connects the corner secondary barriers 41b which are adjacently arranged.

[0299] As shown in Figs. 1 and 2, the liquefied gas storage tank 1 can include a primary barrier 2 which contacts with the liquefied gas, a primary insulation wall 3 which is provided outside the primary barrier 2, a secondary barrier 4 which is provided outside the primary insulation wall 3, and a secondary insulation wall 5 which is provided outside the secondary barrier 4. The liquefied gas storage tank 1 can be supported on the ship body 7 by means of the adhesive 6 which is provided between the secondary insulation wall 5 and the ship body 7. Figure 17 The corner portion of the liquefied gas storage tank 1 of the eighth embodiment of the present application can be composed of a combination of a plurality of corner blocks.

[0300] The corner block of the liquefied gas storage tank 1 is arranged at a corner portion where a first face and a second face having different angles from each other meet to form a storage space which accommodates the liquefied gas, and can include a corner primary insulation wall 3b which fixes a corner primary barrier 2b of a metal material and is arranged outside the corner primary barrier 2b, a corner secondary barrier 41b which is arranged outside the corner primary insulation wall 3b, and a corner secondary insulation wall 5b which is arranged outside the corner secondary barrier 41b.

[0301] ​​​The corner primary barrier 2b can be disposed at a corner portion where the first surface or the second surface having different angles from each other meet and form a storage space to store a liquefied gas as a cryogenic material, and can be composed of a metal material. The corner primary barrier 2b can prevent the liquefied gas from leaking to the outside together with the corner secondary barrier 41b. The corner primary barrier 2b of the present embodiment is basically the same as or similar to the aforementioned first embodiment, and thus a detailed description thereof will be omitted.

[0302] The corner primary barrier 2b can be fixed to the barrier fixing member 21b.

[0303] The barrier fixing member 21b can be disposed at an upper portion of the corner primary insulation wall 3b as a metal material. In the case of the corner primary insulation wall 3b, a plurality of the barrier fixing members 21b can be disposed along the edges of the corner portion on the corner secondary insulation wall 5b, and thus the barrier fixing member 21b can be independently disposed at each of the plurality of corner primary insulation walls 3b.

[0304] The corner primary insulation wall 3b is designed to block heat intrusion from the outside and to be able to withstand an impact from the outside or an impact caused by the liquefied gas shaking inside, and is disposed between the corner primary barrier 2b and the corner secondary barrier 41b.

[0305] The corner primary insulation wall 3b is disposed at the inner side of the first surface and the second surface, respectively, and can include a corner primary insulation 32b fixed to the corner secondary barrier 41b, and an inner side primary clamping plate 31b disposed at the inner side of the corner primary insulation 32b, constituting a step with the corner primary insulation 32b, and fixing the corner primary barrier 2b.

[0306] The corner primary insulation wall 3b in which the inner side primary clamping plate 31b and the corner primary insulation 32b are sequentially stacked can be disposed along the edges of the corner portion on the corner secondary insulation wall 5b.

[0307] In the present embodiment, although a case in which the corner primary insulation wall 3b is composed of the inner side primary clamping plate 31b and the corner primary insulation 32b is described, the corner primary insulation wall 3b can be the same as or similar to the corner primary insulation wall 3b of at least one of the aforementioned first embodiment to the seventh embodiment.

[0308] The plurality of corner primary insulation walls 3b described above are disposed adjacent to each other on the corner secondary insulation wall 5b, and the interval between the plurality of corner primary insulation walls 3b can be minimized to omit an additional insulation such as glass wool filled between the plurality of corner primary insulation walls 3b.

[0309] As described above, when a plurality of corner primary thermal insulation walls 3b are configured, a stepped space will be generated between the corner primary thermal insulation 32b and the inner side primary panel 31b constituting a step therefrom. The corner block of the present embodiment includes an inner side first filler 3b4 filling the stepped space of the corner primary thermal insulation walls 3b configured adjacent to each other, and the corner primary barrier 2b is disposed at the inner side first filler 3b4.

[0310] The inner side first filler 3b4 can be polyurethane foam or glass wool.

[0311] The plurality of corner primary thermal insulation walls 3b are configured as a part of the corner block together with the corner secondary barrier 41b and the corner secondary thermal insulation wall 5b, and the overall width of the plurality of corner primary thermal insulation walls 3b constituting the corner block can have a smaller width than the width of the corner secondary thermal insulation wall 5b constituting the other corner block. Thereby, a part of the corner secondary barrier 41b can be exposed to the outermost side of the plurality of corner primary thermal insulation walls 3b. When the plurality of corner blocks are configured adjacent to each other along the edge of the corner portion, the space portion between the outermost corner primary thermal insulation walls 3b configured adjacent to each other, i.e., the space portion in which the corner secondary barrier 41b is exposed, can be provided with a corner connection thermal insulation wall 34b.

[0312] The corner connection thermal insulation wall 34b is configured between the outermost corner primary thermal insulation walls 3b adjacent to each other when the corner blocks are configured adjacent to each other, and can be configured in a stacked form of the corner connection thermal insulation 341b and the corner connection panel 342b which are the same as or similar to the corner primary thermal insulation wall 3b, and have the same or similar thickness as the corner primary thermal insulation wall 3b.

[0313] Such a corner connection thermal insulation wall 34b is configured to seal the space portion generated between the corner secondary thermal insulation walls 5b configured adjacent to each other together with the corner connection barrier 42b when the plurality of corner blocks are configured adjacent to each other along the edge of the corner portion, thereby performing the role of blocking the intrusion of heat from the outside.

[0314] As described above, when the plurality of corner blocks are configured adjacent to each other along the corner portion, a space will be generated between the corner connection thermal insulation 341b and the corner primary thermal insulation 32b and between the corner connection panel 342b and the inner side primary panel 31b, and the inner side second filler 3b5 in which the corner primary barrier 2b is disposed can be filled in the space to complete the construction of the corner primary thermal insulation wall 3b.

[0315] The inner side second filler 3b5 can be polyurethane foam or glass wool.

[0316] The corner secondary barrier 41b can be provided between the corner primary thermal insulation wall 3b and the corner secondary thermal insulation wall 5b, and can prevent the leakage of liquefied gas to the outside together with the corner primary barrier 2b.

[0317] The corner second prevention wall 41b is configured as a part of the corner block together with the corner first insulation wall 3b and the corner second insulation wall 5b, and when the corner blocks are adjacently arranged, the adjacent corner second prevention walls 41b can be sealingly connected by the corner connecting prevention wall 42b.

[0318] The corner connecting prevention wall 42b can connect the adjacent corner second prevention walls 41b exposed to the outside when the corner blocks are adjacently arranged, and can be provided with the corner connecting insulation wall 34b at the upper portion.

[0319] The corner second insulation wall 5b can include an inner second clamping plate 51b, a corner second insulation member 52b, and an outer second clamping plate 53b. The corner second insulation wall 5b is fixed to the inner side of the first surface and the second surface, respectively, and can be configured by a structure in which the inner second clamping plate 51b, the corner second insulation member 52b, and the outer second clamping plate 53b are sequentially stacked toward the outside of the corner second prevention wall 2b.

[0320] When a plurality of corner blocks are adjacently arranged along the edges of the corner portion, the space generated between the adjacently arranged corner second insulation walls 5b can be filled by the outer side filler 5b4.

[0321] The outer side filler 5b4 can be polyurethane foam or glass wool.

[0322] Such a corner second insulation wall 5b of the present embodiment can be the same as or similar to the corner second insulation wall 5b of at least one of the first embodiment to the seventh embodiment described above, and here, specific description is omitted to avoid repetition.

[0323] Accordingly, in the present embodiment, the corner first insulation wall 3b including the inner first clamping plate 31b constituting a step with the corner first insulation member 32b is arranged in a plurality on the corner second insulation wall 5b, and the adjacent corner first insulation members 32b are adjacently arranged, whereby not only the setting operation of the prevention wall fixing member 21b can be easily performed through the step portion between the adjacently arranged inner first clamping plates 31b, but also the filler 3b4 needs to be disposed only in the step portion, and thus the consumption of the filler can be reduced.

[0324] Figure 18 is a partial front view for explaining a corner portion of a liquefied gas storage tank of a ninth embodiment of the present application, Figure 19 is a partial front view for explaining Figure 18 is a perspective view of an upper block of Figure 20 is a perspective view of an upper connecting block of Figure 18 is a perspective view of an upper block of Figure 21 is an exploded perspective view of the upper block of Figure 19 is a sectional view of the upper block of Figure 22 is a sectional view of the upper block of Figure 19 is a sectional view of the upper block of Figure 23 is a sectional view of the upper block of Figure 19A cross-sectional view of another embodiment of the upper block. Figure 24 It is used for explanation Figure 18 A three-dimensional image of the filling sheet. Figure 25 It is used for explanation Figure 18 A diagram of the anti-adhesion component applicable to the upper connecting block. Figure 26 It is used for explanation Figure 18 A figure shows another embodiment of the anti-adhesion member applicable in the upper connecting block.

[0325] also, Figure 27 (a) and (b) are used to illustrate Figure 18 A diagram of another embodiment of the upper block and the upper connecting block. Figure 28 Yes Figure 27 A magnified main view of the corner portion of the applicable upper block and the upper connecting block. Figure 29 (a) and (b) are used to illustrate Figure 18 A diagram of another embodiment of the upper block and the upper connecting block, Figure 30 Yes Figure 29 A magnified front view of the applicable upper block and the corner portion of the upper connecting block.

[0326] also, Figure 31 Figures (a) and (b) are diagrams showing the results of structural analysis of the wall-mounting member of this embodiment without reinforcement and the wall-mounting member of a comparative example equipped with reinforcement. Figure 32 Figures (a) and (b) are diagrams showing the results of structural analysis of the structures (clamps) provided on the underside of the wall-mounting member of this embodiment without reinforcement and the wall-mounting member of a comparative example with reinforcement.

[0327] like Figure 18 As shown, the corner portion of the liquefied gas storage tank 100 of the ninth embodiment of the present invention can be constructed by a combination of a plurality of corner blocks CB. The basic structure of the corner block CB may include a lower block LB, a plurality of upper blocks UB, and an upper connecting block UBB, wherein the lower block LB is fixed to the hull 7 and is composed of a single board, the plurality of upper blocks UB are bonded to the lower block LB, and the upper connecting block UBB connects the adjacent lower blocks LB.

[0328] As in the first to eighth embodiments described above, the corner block CB of the present embodiment can be arranged at a corner portion where the first face and the second face having different angles from each other meet to form a storage space in which a liquefied gas is stored, and although not shown, in a state where the corner block CB is arranged, a corner primary barrier 2b of a metal material is formed on the upper block UB and the upper connecting block UBB as described above, thereby completing a corner portion of the liquefied gas storage tank 100 having a storage space for storing a liquefied gas as a cryogenic substance in a sealed manner.

[0329] The liquefied gas storage tank 100 of the present embodiment can be completed by connecting the corner block CB formed on the corner portion described above and a flat block formed on a flat portion, and the flat block can be the flat block FB of the first embodiment described above or the flat block FB of the tenth embodiment described below, but is not limited thereto. Figure 1 Figure 33 The flat block FB of the tenth embodiment described below will be described in detail below.

[0330] Further, the corner block CB of the present embodiment will be described below by being divided into a lower block LB, an upper block UB, and an upper connecting block UBB, but is not limited thereto and can be the same as or similar to at least one structure of the first to eighth embodiments described above.

[0331] As shown in FIG. 1, the lower block LB can include a corner secondary barrier 41b, a corner connecting barrier 42b, and a corner secondary thermal insulation wall 5b, and a plurality of upper blocks UB and upper connecting blocks UBB can be bonded and coupled to an upper surface of the corner secondary barrier 41b. Figure 18 The corner secondary barrier 41b, the corner connecting barrier 42b, and the corner secondary thermal insulation wall 5b will be described in detail below.

[0332] The lower block LB of the present embodiment can be the same as or similar to the structure of at least one of the first to eighth embodiments described above, and detailed descriptions thereof will be omitted here to avoid repetition.

[0333] The plurality of upper blocks UB can be bonded and coupled to the lower block LB.

[0334] As shown in FIG. 1, the upper block UB can include a corner primary barrier 2b, a corner secondary barrier 41b, a corner connecting barrier 42b, and a corner secondary thermal insulation wall 5b. Figure 18 Figure 19 Figure 21 ​​​As shown, the plurality of upper blocks UB each have a basic structure constituted by the corner primary barrier 2b of a fixed metal material and the barrier fixing member 21b disposed outside the corner primary barrier 2b and the corner primary thermal insulation wall 3b disposed outside the barrier fixing member 21b. Among them, the corner primary thermal insulation wall 3b can further include the inner side bent portion 3b3.

[0335] As described above, the upper blocks UB having the basic structure can be arranged side by side at a predetermined gap from each other and bonded to the lower block LB. In the present embodiment, as shown, there can be five upper blocks UB arranged side by side at a predetermined gap from each other, but not limited thereto. Figure 18

[0336] The barrier fixing member 21b can be provided at the upper portion of the corner primary thermal insulation wall 3b as a metal material and bent at a predetermined angle at the inner side of the first and second faces, for example, at the same angle as the angle constituted by the first and second faces having different angles from each other forming the storage space in which the liquefied gas is accommodated. In the case of the corner primary thermal insulation wall 3b, there can be a plurality of the barrier fixing member 21b disposed along the edge of the corner portion constituting a right angle or an obtuse angle on the corner secondary thermal insulation wall 5b constituting the lower block LB, and thus the barrier fixing member 21b is bent at a right angle or an obtuse angle and independently provided at the upper portion of each of the plurality of corner primary thermal insulation walls 3b.

[0337] The barrier fixing member 21b can be provided at the upper portion of the corner primary thermal insulation wall 3b using a plurality of coupling members 21b1 provided at the back face. The coupling member 21b1 can be constituted by a stud bolt and a nut.

[0338] As shown, the barrier fixing member 21b of the present embodiment is not equipped with a reinforcing member for supporting the upper portion of the corner primary thermal insulation wall 3b at the back face. Figure 21 In general, as a reinforcing member for supporting the upper portion of the corner primary thermal insulation wall 3b, there can be a reinforcing member 122b as shown in (b) of FIG. 12. That is, the general barrier fixing member 121b is provided with the reinforcing member 122b along the edge of the back face as a reinforcing member. Such a reinforcing member 122b has the concept of tightly fixing the upper block UB.

[0339] Figure 31 However, the general barrier fixing member 121b equipped with the reinforcing member 122b has a problem of being weak in burden when an external force such as a motion or a thermal load due to a ship motion is applied to the portion bent at a right angle or an obtuse angle.

[0340] However, the general barrier fixing member 121b equipped with the reinforcing member 122b has a problem of being weak in burden when an external force such as a motion or a thermal load due to a ship motion is applied to the portion bent at a right angle or an obtuse angle.

[0341] ​​To this end, the bulkhead fixing member 21b of the present embodiment is not equipped with a reinforcing member such as the stiffener 122b on the back surface, but is joined to the upper surface of the corner primary insulation bulkhead 3b in a plane-to-plane manner, and such a structure is also confirmed by the results of the structural analysis.

[0342] Figure 31 (a) of FIG. 10 is a graph showing the results of the structural analysis of the bulkhead fixing member 21b of the present embodiment, which is not equipped with the stiffener 122b, when an external force such as a motion or a thermal load due to a ship motion is applied, Figure 31 (b) of FIG. 10 is a graph showing the results of the structural analysis of the general bulkhead fixing member 121b equipped with the stiffener 122b in the liquefied gas storage tank (100a) of the comparative example when an external force such as a motion or a thermal load due to a ship motion is applied, and it is confirmed by comparing the results of the structural analysis that, in the case where the stiffener 122b is not equipped (the present embodiment), the external force can be flexibly dealt with, and thus the load is uniformly distributed at the portion bent at a right angle or an obtuse angle, as compared to the case where the stiffener 122b is equipped (the comparative example).

[0343] Figure 32 (a) of FIG. 10 is a graph showing the results of the structural analysis of the bulkhead fixing member 21b of the present embodiment, which is not equipped with the stiffener 122b, when an external force such as a motion or a thermal load due to a ship motion is applied, Figure 32 (b) of FIG. 10 is a graph showing the results of the structural analysis of the general bulkhead fixing member 121b equipped with the stiffener 122b in the liquefied gas storage tank (100a) of the comparative example when an external force such as a motion or a thermal load due to a ship motion is applied, and it is confirmed by comparing the results of the structural analysis that, in the case where the stiffener 122b is not equipped (the present embodiment), the external force can be flexibly dealt with, and thus the load is uniformly distributed at the portion bent at a right angle or an obtuse angle, as compared to the case where the stiffener 122b is equipped (the comparative example).

[0344] Therefore, in this embodiment, no reinforcing member such as the reinforcing member 122b is provided on the back side of the wall-mounting member 21b, thus reducing the weight of the wall-mounting member 21b itself. Furthermore, no welding is performed to attach the reinforcing member, which reduces welding time and improves accuracy during manufacturing. Moreover, as the load generated in the portion bent at a right angle or obtuse angle is evenly distributed, compared to a conventional wall-mounting member 121b equipped with the reinforcing member 122b, the frequency of damage in the bent portion is reduced, and repair is minimized, thereby improving the stability of the system.

[0345] The primary corner insulation wall 3b is designed to block heat intrusion from the outside and to withstand impacts from the outside or impacts caused by the internal sloshing of liquefied gas, and is located between the secondary corner insulation wall 41b of the wall fixing member 21b and the lower block LB.

[0346] The corner primary insulation wall 3b is respectively disposed 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, which are formed by stacking the inner primary clamping plate 31b, the corner primary insulation member 32b and the outer primary clamping plate 33b in sequence on the outer side of the wall fixing member 21b.

[0347] In addition, the corner primary heat insulation wall 3b may include: an inner bending portion 3b3, and the space between the inner first fixing portion 3b1 and the inner second fixing portion 3b2 is composed of a heat insulation member.

[0348] The corner primary insulation wall 3b of this embodiment may be the same as or similar to the corner primary insulation wall 3b of the first embodiment described above. Here, in order to avoid repetition, the specific description is omitted.

[0349] In the upper block UB as described above, the inner primary clamping plate 31b is provided on the inner upper surface of the corner primary insulation member 32b, and forms a step with the corner primary insulation member 32b. Therefore, when the upper blocks UB having the basic structure are arranged side-by-side with a predetermined gap between them, adjacent corner primary insulation members 32b are arranged adjacently, creating a step space between adjacent inner primary clamping plates 31b. It is possible to omit filling the space between the adjacent corner primary insulation members 32b. Although this embodiment describes the case where filling the space between the corner primary insulation members 32b is omitted, it is also possible to install insulation between the corner primary insulation members 32b.

[0350] like Figure 24 As shown, a stuffing piece (10) is inserted into the stepped space created between adjacent inner primary clamping plates 31b. A detailed description of the stuffing piece 10 will be given later.

[0351] The upper connection block UBB can be adhesively bonded to the upper surfaces of the adjacent lower blocks LB, thereby connecting the lower blocks LB.

[0352] As shown in FIGS. 1 and 2, the upper connection block UBB can include a corner connection heat insulating wall 34b disposed outside the corner heat insulating wall 3b. Figure 18 Figure 20 The corner connection heat insulating wall 34b can be designed to block heat from the outside together with the corner primary heat insulating wall 3b and to withstand an impact from the outside or an impact caused by a liquefied gas inside, and can be disposed between the corner connection heat insulating wall 34b and the corner connection heat insulating wall 42b of the lower block LB.

[0353] The corner connection heat insulating wall 34b of the upper connection block UBB can be designed to block heat from the outside together with the corner primary heat insulating wall 3b and to withstand an impact from the outside or an impact caused by a liquefied gas inside, and can be disposed between the corner connection heat insulating wall 34b and the corner connection heat insulating wall 42b of the lower block LB.

[0354] The corner connection heat insulating wall 34b of the upper connection block UBB can be designed to block heat from the outside together with the corner primary heat insulating wall 3b and to withstand an impact from the outside or an impact caused by a liquefied gas inside, and can be disposed between the corner connection heat insulating wall 34b and the corner connection heat insulating wall 42b of the lower block LB.

[0355] The corner connection heat insulating wall 34b can be disposed inside the first and second surfaces, and can include a corner first connection fixing part 34b1 and a corner second connection fixing part 34b2, which are sequentially stacked with a corner first connection clamp plate 342b, a corner connection heat insulating member 341b, and a corner second connection clamp plate 343b outside the corner connection heat insulating wall 34b.

[0356] In addition, the corner connection heat insulating wall 34b can include a corner connection bending part 34b3, and a space part between the corner first connection fixing part 34b1 and the corner second connection fixing part 34b2 can be formed of a heat insulating member. The corner connection bending part 34b3 can be formed of the same or similar material as the inner side bending part 3b3, such as low-density polyurethane foam or glass wool.

[0357] In the present embodiment, the corner connection heat insulating wall 34b is different from the corner primary heat insulating wall 3b only in reference numerals, and can be the same or similar in structure. Thus, detailed descriptions thereof will be omitted.

[0358] ​In the upper connecting block UBB configured as described above, the corner first connecting clamping plate 342b is provided on the inner side upper surface of the corner connecting thermal insulator 34b and forms a step with the corner connecting thermal insulator 34b. Thus, when the upper connecting block UBB is arranged at the connecting portion of the lower block LB in order to connect the adjacent lower blocks LB, the corner connecting thermal insulator 341b of the upper connecting block UBB and the corner primary thermal insulator 32b of the upper block UB are arranged in abutment, and a step space is formed between the corner first connecting clamping plate 342b of the upper connecting block UBB and the inner side primary clamping plate 31b of the upper block UB. The filling of an additional thermal insulator can be omitted between the corner primary thermal insulator 32b of the upper block UB and the corner connecting thermal insulator 341b of the upper connecting block UBB arranged in abutment with each other. In the present embodiment, although the case where the filling of the thermal insulator is omitted between the corner primary thermal insulator 32b of the upper block UB and the corner connecting thermal insulator 341b of the upper connecting block UBB is described, the thermal insulator can be installed between the corner primary thermal insulator 32b of the upper block UB and the corner connecting thermal insulator 341b of the upper connecting block UBB.

[0359] As shown in Figs. 10 and 11, a step space is formed between the corner first connecting clamping plate 342b and the inner side primary clamping plate 31b. Figure 24

[0360] As shown in Figs. 10 and 11, a step space is formed between the corner first connecting clamping plate 342b and the inner side primary clamping plate 31b. Figure 18 Figure 24 As shown in Figs. 10 and 11, the stuffing piece 10 is inserted not only into the first step space formed between the inner side primary clamping plates 31b of the adjacent upper blocks UB but also into the second step space formed between the inner side primary clamping plate 31b of the upper block UB and the corner first connecting clamping plate 342b of the upper connecting block UBB. Thus, not only the gap interval between the adjacent upper blocks UB and the gap interval between the upper block UB and the upper connecting block UBB can be constantly maintained, but also the inner side 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 the work on the upper block UB can be easily performed.

[0361] In the case where the inner side bent portion 3b3 or the corner connecting bent portion 34b3 is not fixed, the predetermined gap between the adjacent upper blocks UB or between the upper block UB and the upper connecting block UBB cannot be maintained, and a deviation phenomenon can occur.

[0362] ​​Thus, as with the general parapet fixing member 121b described above, in the case where the reinforcing member 122b is provided along the edge of the back surface, the reinforcing member 122b can fix the inner side bent portion 3b3 or the corner connecting bent portion 34b3, but in the case of the parapet fixing member 21b of the present embodiment, since the reinforcing member 122b is not provided, an additional fixing unit is required to fix the inner side bent portion 3b3 or the corner connecting bent portion 34b3, and the filler sheet 10 will function as the fixing unit.

[0363] Such a filler sheet 10 can be formed of the same or similar material as the inner side bent portion 3b3 or the corner connecting bent portion 34b3, for example, low-density polyurethane foam, and can include a main body 11 having a shape corresponding to the first and second stepped spaces, and an end portion 12 which is inserted into the inner side bent portion 3b3 or the corner connecting bent portion 34b3 after the main body 11 is inserted into the first and second stepped spaces.

[0364] The end portion 12 can be formed in a wedge shape to easily be inserted into the inner side bent portion 3b3 or the corner connecting bent portion 34b3.

[0365] In addition, the end portion 12 can be coated with an adhesive (not shown) to stably fix the inner side bent portion 3b3 or the corner connecting bent portion 34b3.

[0366] Referring to Figure 21 and Figure 22 , the assembly process of the upper block UB described above will be described.

[0367] In the primary assembly process, the outer side primary clamping plate 33b having a plurality of first holes 81 is adhesively coupled to the outer side surface of the corner primary thermal insulator 32b having a plurality of second holes 82, and the inner side primary clamping plate 31b having a plurality of third holes 83 is adhesively coupled to the inner side surface of the corner primary thermal insulator 32b having a plurality of second holes 82.

[0368] The first, second, and third holes 81, 82, 83 can be formed on extension lines of positions corresponding to the plurality of coupling members 21b1 provided in the parapet fixing member 21b, respectively. The first and second holes 81, 82 have the same size and have a hole shape that is communicated as the outer side primary clamping plate 33b and the corner primary thermal insulator 32b are adhesively coupled, and can be sealed by inserting a form plug 9 into such a communicated hole, and the third hole 83 can be formed to have a size in which the coupling member 21b1 can be inserted.

[0369] In the second assembly process, the barrier fixing member 21b is attached to the upper surface of the inner side primary clamping plate 31b in a manner that the plurality of coupling members 21b1 are inserted into the plurality of third holes 83 formed on the inner side primary clamping plate 31b, in a state that the outer side primary clamping plate 33b, the corner primary thermal insulation 32b, and the inner side primary clamping plate 31b are adhesively coupled.

[0370] In the third assembly process, the barrier fixing member 21b is fixed to the upper surface of the inner side primary clamping plate 31b by bolt fastening of the coupling members 21b1 through the communication hole formed by the plurality of first and second holes 81, 82.

[0371] In the fourth assembly process, the molded plug 9 is inserted into the communication hole formed by the plurality of first and second holes 81, 82, in a state that the barrier fixing member 21b is fixed to the inner side primary clamping plate 31b. The molded plug 9 has a size corresponding to the communication hole, and can be made of the same or similar material as the corner primary thermal insulation 32b.

[0372] Then, the inner side first fixing part 3b1 and the inner side second fixing part 3b2 formed by the structure that the outer side primary clamping plate 33b, the corner primary thermal insulation 32b, and the inner side primary clamping plate 31b are adhesively coupled, and the inner side bending part 3b3 are inserted into the space part between the inner side first fixing part 3b1 and the inner side second fixing part 3b2, thereby completing the assembly process of the upper block UB.

[0373] As described above, the upper block UB of the present embodiment has a structure that enables the following assembly process: the outer side primary clamping plate 33b having the plurality of first holes 81, the corner primary thermal insulation 32b having the plurality of second holes 82, and the inner side primary clamping plate 31b having the plurality of third holes 83 are adhesively coupled first, and then the barrier fixing member 21b is bolt fastened.

[0374] Here, although the assembly process of the upper block UB is described, the upper connection block UBB which is the same or similar in structure to the upper block UB can also be assembled in the same or similar assembly process. Thus, in the present embodiment, the structure of the upper block UB can be used as a meaning of a structure including the upper connection block UBB.

[0375] The above-described upper block UB of the present embodiment has a structure that the plurality of first holes 81 are formed on the outer side primary clamping plate 33b, and the plurality of second holes 82 are formed on the corner primary thermal insulation 32b, but the first and second holes 81, 82 formed on the outer side primary clamping plate 33b and the corner primary thermal insulation 32b, respectively, can be removed. For this, refer to Figure 23 for description.

[0376] As Figure 23As shown, the upper block UB of another embodiment can have a structure in which the aforementioned first and second holes 81 and 82 are omitted in the outer side one-sided board 33b and the corner one-sided thermal insulator 32b, respectively.

[0377] In this case, the assembly process of the upper block UB of another embodiment can be different, which is described below.

[0378] In the first assembly process, the barrier fixing member 21b is attached to the upper surface of the inner side one-sided board 31b in a manner that the plurality of third holes 83 formed in the inner side one-sided board 31b are inserted into the plurality of coupling members 21b1, and the coupling members 21b1 are bolted, so that the barrier fixing member 21b is fixed to the upper surface of the inner side one-sided board 31b.

[0379] In the second assembly process, the corner one-sided thermal insulator 32b is adhesively coupled to the outer side surface of the inner side one-sided board 31b, and the outer side one-sided board 33b is adhesively coupled to the outer side surface of the corner one-sided thermal insulator 32b.

[0380] Then, the inner side bent portion 3b3 is inserted into the space portion between the inner side first fixing portion 3b1 and the inner side second fixing portion 3b2 formed by the structure in which the outer side one-sided board 33b, the corner one-sided thermal insulator 32b, and the inner side one-sided board 31b are adhesively coupled, to complete the assembly process of the upper block UB.

[0381] In the upper block UB of another embodiment assembled as described above, the additional insertion process of forming the additional first and second holes 81 and 82 and the plug 9 in the outer side one-sided board 33b and the corner one-sided thermal insulator 32b, respectively, can be omitted, and the first and second holes 81 and 82 can be removed, so that not only the maintenance of thermal insulation is facilitated, but also the strength can be increased, and further, in the case of adhesively coupling the upper block UB of another embodiment to the lower block LB, the adhesion lost due to the first and second holes 81 and 82 can be filled in the process of gluing the lower portion of the upper block UB of another embodiment, so that the adhesion strength is also facilitated.

[0382] In this case, the plurality of upper blocks UB are adhesively coupled to the upper surface of the lower block LB arranged adjacent to each other, and the upper connection block UBB is adhesively coupled to the upper surfaces of the respective lower blocks LB arranged adjacent to each other, so that the lower blocks LB can be connected.

[0383] The upper connection block UBB can be coupled to the lower block LB by being adhesively coupled to the corner second connection board 343b, and thus, as shown in Figure 28 or Figure 30 the corner connection barrier 42b is adhesively coupled by being pressed in a state in which the adhesive 20 is applied to the upper surface of the corner connection barrier 42b corresponding to the corner second connection board 343b.

[0384] At this time, in order to improve the bonding force between the upper connecting block UBB and the lower block LB, pressure is applied in such a way that the adhesive 20 overflows (squeeze out) to a predetermined degree, so that the entire contact surface of the corner second connecting clamp 343b, which is the bonding area, is bonded to the corner connecting barrier 42b.

[0385] However, if there is too much adhesive 20, the overflowing adhesive 20 will spill onto the exposed surfaces of the corner joint bend 34b3 and the corner joint insulation 341b, which are non-adhesive areas that should not be bonded. This may cause the corner joint bend 34b3 and the corner joint wall 42b, or the corner joint insulation 341b and the adjacent upper block UB corner insulation 32b, to bond together. Therefore, additional work is required at the site to scrape off the adhesive 20 that has overflowed into the non-adhesive areas.

[0386] In the case of this embodiment, such as Figure 18 As shown, the gap between the corner heat insulation member 341b of the upper connecting block UBB and the corner primary heat insulation member 32b of the upper block UB is narrow enough that the extent of adhesive 20 overflow cannot be visually confirmed, so it is not easy to scrape off the adhesive 20 that overflows through the gap.

[0387] Therefore, in this embodiment, as Figure 25 as well as Figure 26 As shown, it also includes: an anti-adhesion member 30, which prevents the adhesive 20 from overflowing onto the exposed surfaces of the corner connection bend 34b3 and the corner connection heat insulation member 341b, which are non-adhesive areas, during the bonding of the upper connecting block UBB, or prevents the corner connection bend 34b3 and the corner connection heat insulation member 42b, or the corner connection heat insulation member 341b and the adjacent upper block UB's primary corner heat insulation member 32b, even if the adhesive 20 overflows. The anti-adhesion member 30 can be formed of a sponge-like membrane.

[0388] like Figure 25 As shown, the anti-adhesion member 30 can be provided on the exposed surfaces of the corner connection bend 34b3 and the corner connection heat insulation member 341b in the upper connection block UBB as non-adhesion areas.

[0389] In addition, such as Figure 26 As shown, the anti-adhesion member 30 is provided on the exposed surface of the corner connection wall 42b of the lower block LB, which is in contact with the corner connection bend 34b3 of the upper connecting block UBB, which is a non-adhesion area, and on the exposed surfaces of the inner bend 3b3 of the upper block UB and the corner primary insulation member 32b, which are adjacent to the corner connection insulation member 341b of the upper connecting block UBB, which is a non-adhesion area.

[0390] like Figure 18 ,Figure 28 as well as Figure 30 As shown, in this embodiment, the upper blocks UB are arranged side by side with a predetermined gap between them and are bonded to the upper surface of the lower block LB. The upper blocks UB are bonded to the lower block LB along with the outer primary clamping plate 33b. Therefore, the bonding is achieved by applying pressure while the adhesive 20 is applied to the upper surface of the corner secondary guardrail 41b corresponding to the outer primary clamping plate 33b.

[0391] At this time, in order to improve the bonding force between the upper block UB and the lower block LB, the adhesive 20 is pressed outward to a predetermined degree so that the entire contact surface of the outer primary clamp 33b, which is the bonding area, is bonded to the corner secondary barrier 41b.

[0392] In addition, such as Figure 18 , Figure 28 as well as Figure 30 As shown, in a state where multiple upper blocks UB are bonded to the upper surfaces of lower blocks LB arranged adjacently, in this embodiment, the upper connecting block UBB is bonded to the upper surfaces of adjacent lower blocks LB, thereby connecting the lower blocks LB. Since the upper connecting block UBB is bonded to the lower blocks LB along with the corner second connecting clamp 343b, pressure is applied to bond the blocks together while adhesive 20 is applied to the upper surface of the corner connecting barrier 42b corresponding to the corner second connecting clamp 343b.

[0393] At this time, in order to improve the bonding force between the upper connecting block UBB and the lower block LB, pressure is applied in a manner that causes the adhesive 20 to overflow (squeeze out) to a predetermined extent, so as to bond the entire contact surface of the corner second connecting clamp 343b, which is the bonding area, to the corner connecting barrier 42b as much as possible.

[0394] However, in this embodiment, the gaps between the corner primary insulation member 32b of the upper block UB and the adjacent corner primary insulation member 32b, as well as the gaps between the corner connecting insulation member 341b of the upper connecting block UBB and the corner primary insulation member 32b of the upper block UB, are narrow enough that the extent of adhesive 20 overflow cannot be visually confirmed. Therefore, overflow (squeeze out) cannot be confirmed. That is, when bonding the upper block UB and the upper connecting block UBB to the lower block LB, it cannot be confirmed that the adhesive 20 is adequately applied. This will result in insufficient bonding area, leading to a decrease in the bonding force between the upper block UB and the lower block LB, or between the upper connecting block UBB and the lower block LB, or poor bonding such as adjacent blocks UB and UBB being bonded together.

[0395] Therefore, in this embodiment, as Figures 27 to 30As shown, the overflow confirmation unit is provided to confirm the overflow of the adhesive 20 when the upper blocks UB and the upper connecting blocks UBB are adhesively joined to the lower block LB, thereby preventing poor adhesively joining.

[0396] The overflow confirmation unit can be Figure 27 (a) a cavity CF provided at both side ends of the outer side primary clamping plate 33b of the upper block UB, and Figure 27 (b) a cavity CF provided at both side ends of the corner second connecting clamping plate 343b of the upper connecting block UBB. As shown in Figure 28 the cavities CF form spaces between the upper blocks UB and the upper blocks UB adjacent thereto and between the upper blocks UB and the upper connecting blocks UBB adjacent thereto when the upper blocks UB and the upper connecting blocks UBB are arranged on the lower block LB, thereby enabling confirmation of the overflow of the adhesive 20 from the front and the like.

[0397] Further, the overflow confirmation unit can be Figure 29 (a) a groove GV provided adjacent to both side edges of the outer side primary clamping plate 33b of the upper block UB, and Figure 29 (b) a groove GV provided adjacent to both side edges of the corner second connecting clamping plate 343b of the upper connecting block UBB. As shown in Figure 30 the grooves GV enable confirmation of the overflow of the adhesive 20 from the upper blocks UB and the upper connecting blocks UBB from the front and the like in a state in which a plurality of the upper blocks UB and the upper connecting blocks UBB are arranged on the lower block LB.

[0398] Thus, in the present embodiment, the outer side primary clamping plate 33b and the corner second connecting clamping plate 343b as the lower layer of each of the upper blocks UB and the upper connecting blocks UBB are shaped as the cavity CF or the groove GV as the overflow confirmation unit, thereby enabling reduction of the weight of each of the upper blocks UB and the upper connecting blocks UBB and direct confirmation of the overflow of the adhesive 20 with the naked eye after application of the adhesive 20 to each of the upper blocks UB and the upper connecting blocks UBB, and thus enabling improvement of the stability of the system. When the cavity CF and the groove GV as the overflow confirmation unit are compared, in the case of the cavity CF, the amount of the applied adhesive 20 can be increased compared to the case of the groove GV, and thus the adhesive force can be increased.

[0399] Figure 33 is a diagram for explaining a liquefied gas storage tank of a tenth embodiment of the present application.

[0400] As shown in Figure 33As shown, in the liquefied gas storage tank 200 of the tenth embodiment of the present application, after the corner block CB is installed at the corner portion and the flat block FB is installed at the flat portion, the work of filling the thermal insulation member into the gap generated at the portion where the corner block CB and the flat block FB meet due to the tank hull and the block installation tolerance is performed.

[0401] Generally, it is known that, in the work of filling the thermal insulation member into the gap generated at the portion where the corner block CB and the flat block FB meet (block connection system installation work), since the size of the gap is not constant, the procedure is complicated and a large amount of time needs to be invested.

[0402] In this regard, in the present embodiment, the work of filling the thermal insulation member into the gap generated at the portion where the corner block CB and the flat block FB meet can be simplified, and a specific description is as follows.

[0403] 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 generated at a portion where the corner block CB and the flat block FB meet due to the tank hull and the block installation tolerance.

[0404] The flat block FB includes: a flat primary thermal insulation wall 3a that fixes a flat primary barrier 2a of a metal material and is disposed outside the flat primary barrier 2a; a flat secondary barrier 41a that is disposed outside the flat primary thermal insulation wall 3a; and a flat secondary thermal insulation wall 5a that is disposed outside the flat secondary barrier 41a and is disposed in the hull 7, the flat block FB is disposed at the flat portion of the first face or the second face having different angles from each other, and can form a storage space that accommodates a liquefied gas together with the corner block CB.

[0405] In the present embodiment, the flat block FB can be the same or similar structure as the flat block of the first embodiment described above, but is not limited thereto and can be the structure of other known flat blocks.

[0406] The corner block CB includes: a corner primary thermal insulation wall 3b that fixes a corner primary barrier 2b of a metal material and is disposed outside the corner primary barrier 2b; a corner secondary barrier 41b that is disposed outside the corner primary thermal insulation wall 3b; and a corner secondary thermal insulation wall 5b that is disposed outside the corner secondary barrier 41b and is disposed in the hull 7, the corner block CB is disposed at the corner portion where the first face and the second face meet, and can form a storage space that accommodates a liquefied gas together with the flat block FB.

[0407] In the present embodiment, the corner block CB can be the same or similar structure as the corner block of the first embodiment to the ninth embodiment described above, but is not limited thereto and can be the structure of other known corner blocks.

[0408] The block connection system 40 can be provided in the gap between the flat secondary thermal insulation wall 5a of the flat block FB and the corner secondary thermal insulation wall 5b of the corner block CB to connect the flat block FB and the corner block CB, and can include a flow path member 41, a block buffer member 42, and a block connection member 43.

[0409] The flow path member 41 can be provided at the bottom of the gap in a manner that the first space between the flat 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 passage such as condensed water or a nitrogen gas circulation (N2 Gas Circulation) passage.

[0410] That is, although described later, the block connection member 43 of the present embodiment is formed in a manner that is automatically sprayed by the spraying device 50, and thus, in a case where the flow path member 41 is not provided, the block connection member 43 will block the first space of the lower portion of the flat block FB and the second space of the lower portion of the corner block CB from each other, and thus, there is a problem that the flow path of the liquid such as condensed water or nitrogen gas flowing in the lower portions of the flat block FB and the corner block CB is blocked.

[0411] The flow path member 41 of the present embodiment can be formed of a mesh-shaped melamine foam, but is not limited thereto, and can be formed of other members through which gas or liquid can pass.

[0412] The block buffer member 42 can be provided in a manner that is pre-constructed at the side surface of the flat block FB constituting one side surface of the gap.

[0413] The block buffer member 42 can be made of a soft thermal insulation material in a thin thickness so as to be able to relieve the burden generated between the flat block FB and the corner block CB due to external force caused by hull movement or the burden caused by thermal relaxation / contraction. As the soft thermal insulation material forming the block buffer member 42, for example, low-density polyurethane foam or glass wool can be used. That is, the block buffer member 42 formed of the soft thermal insulation material cannot function as the strength member described later, but can be processed in a thin thickness to a minimum extent to relieve external burden.

[0414] The block connection member 43 can be provided in a manner that is post-constructed by spraying a hard thermal insulation material to the inside of the gap in a state that the flow path member 41 and the block buffer member 42 are pre-constructed, by using the spraying device 50.

[0415] The block connecting member 43 can be formed of a material having the same or similar thermal insulation property as the flat blocks FB and the corner blocks CB. That is, the block connecting member 43 can be formed of a variety of hard thermal insulation members having a strength capable of bearing a load of the liquefied gas filled inside the liquefied gas storage tank 200 to a certain extent. As the hard thermal insulation member forming the block connecting member 43, for example, high-density polyurethane foam can be used, but is not limited thereto.

[0416] The upper surface level of the block connecting member 43 described above can be formed to be similar to or the same as the upper surface level of the flat blocks FB and the corner blocks CB.

[0417] Accordingly, in the case where the difference in the gap by interval is large due to the tolerance of the tank body, the gap value between the flat blocks FB and the corner blocks CB is measured at a certain interval, and then the information is input to the injection device 50 to adjust the amount of the injected thermal insulation member.

[0418] At this time, the injection device 50 can be manufactured to be capable of being disposed on a rail similar to or the same as the rail for disposing the corner connecting barrier 42b, and the amount of the injected thermal insulation member is adjusted so that the amount of the injected thermal insulation member is maximally prevented from spilling onto the upper surfaces of the flat blocks FB and the corner blocks CB.

[0419] Further, in the case where the upper surface level of the block connecting member 43 described above needs to be accurately identical to the upper surface level of each of the flat blocks FB and the corner blocks CB for the disposition of the corner connecting barrier 42b as a subsequent process, the level can be made identical by grinding the protruding portion using a grinding machine after one-time construction in a manner that the amount of the thermal insulation member is slightly increased compared to the upper surface level of each of the flat blocks FB and the corner blocks CB.

[0420] The present application is not limited to the embodiments described above, and can include a combination of the embodiments or a combination of at least one of the embodiments and a known technique as another embodiment.

[0421] Although the present application has been described in detail by specific embodiments above, it is for the purpose of specifically explaining the present application, and the present application is not limited thereto, and a person skilled in the art can modify or improve within the technical idea of the present application.

[0422] Simple modifications or changes of the present application all belong to the scope of the present application, and the specific scope of protection of the present application will be more clearly defined by the attached claims.

[0423] Explanation of reference numerals

[0424] 1, 100, 100a, 200: liquefied gas storage tank 2: primary barrier

[0425] 2a: flat primary barrier 2b: corner primary barrier

[0426] 21b, 121b: barrier fixing member 21b1: coupling member

[0427] 122b: reinforcing member 3: primary insulation wall

[0428] 3a: flat primary insulation wall 31a: flat primary batten

[0429] 32a: flat primary insulation member 33a: flat connecting insulation wall

[0430] 331a: flat connecting batten 332a: flat connecting insulation member

[0431] 3b: corner primary insulation wall 3b1: inner first fixing portion

[0432] 3b2: inner second fixing portion 31b: inner primary batten

[0433] 32b: corner primary insulation member 33b: outer primary batten

[0434] 3b12: inner intermediate fixing portion 31b12: inner intermediate batten

[0435] 32b12: corner intermediate insulation member 34b: corner connecting insulation wall

[0436] 34b1: corner first connecting fixing portion 34b2: corner first connecting fixing portion

[0437] 341b: corner connecting insulation member 342b, 343b: corner connecting batten

[0438] 34b3: corner connecting bent portion 3b3: inner bent portion

[0439] 3b31: insulation member 3b32: insulation member

[0440] 3b33: outer insulation member 3b34: inner insulation member

[0441] 3b35: insulation member 3b36: insulation member

[0442] 3b37: vacuum insulation panel 3b4: inner first filling member

[0443] 3b5: inner second filling member 4: secondary barrier

[0444] 41a: flat secondary barrier 42a: flat connecting barrier

[0445] 41b: corner secondary barrier 42b: corner connecting barrier

[0446] 5: secondary thermal insulation wall 5a: flat secondary thermal insulation wall

[0447] 51a: flat secondary thermal insulation 52a: flat secondary thermal insulation

[0448] 5b: corner secondary thermal insulation wall 5b1: outer first fixed portion

[0449] 5b2: outer second fixed portion 51b: inner secondary thermal insulation

[0450] 51b1: peripheral thermal insulation 51b2: inclined thermal insulation

[0451] 52b: corner secondary thermal insulation 53b: outer secondary thermal insulation

[0452] 5b12: outer intermediate fixed portion 51b12: outer intermediate thermal insulation

[0453] 52b12: outer intermediate thermal insulation 53b12: inner intermediate thermal insulation

[0454] 5b3: outer bent portion 5b31: thermal insulation

[0455] 5b32: thermal insulation 5b4: outer filling

[0456] 6: adhesive 7: hull

[0457] 81: first hole 82: second hole

[0458] 83: third hole 9: molded plug

[0459] 10: filling sheet 11: main body

[0460] 12: end portion 20: adhesive

[0461] 30: anti-sticking structure 40: block connection system

[0462] 41: flow path member 42: block buffer member

[0463] 43: block connection member 50: injection device

[0464] ED: division direction FB: flat block

[0465] CB: corner block LB: lower block

[0466] UB: upper block UBB: upper connection block

[0467] CF: chamber GV: groove

Claims

1.A liquefied gas storage tank, characterized by comprising: a flat block configured in a flat portion of a first face or a second face having different angles from each other forming a storage space in which a liquefied gas is accommodated, the flat block including a flat first thermal insulation wall, a flat second barrier wall, and a flat second thermal insulation wall, the flat first thermal insulation wall fixing a flat first barrier wall of a metal material and being configured outside the flat first barrier wall, the flat second barrier wall being provided outside the flat first thermal insulation wall, the flat second thermal insulation wall being configured outside the flat second barrier wall; and a corner block configured in a corner portion where the first face and the second face meet, the corner block including a corner first thermal insulation wall, a corner second barrier wall, and a corner second thermal insulation wall, the corner first thermal insulation wall fixing a corner first barrier wall of a metal material and being configured outside the corner first barrier wall, the corner second barrier wall being provided outside the corner first thermal insulation wall, the corner second thermal insulation wall being configured outside the corner second barrier wall, the corner first thermal insulation wall being formed of a structure in which a batten and a thermal insulation member of polyurethane foam are combined, a lower layer of the corner first thermal insulation wall being provided with an overflow confirmation unit capable of confirming overflow of an adhesive when the corner first thermal insulation wall is adhesively coupled to the corner second barrier wall; the overflow confirmation unit adopting a cavity CF or a groove GV shape. 2.The liquefied gas storage tank according to claim 1, characterized in that the corner first thermal insulation wall includes: an outer first batten fixed to the corner second barrier wall; an inner first batten fixing the corner first barrier wall; and a corner first thermal insulation member configured between the outer first batten and the inner first batten; an inner first fixing portion and an inner second fixing portion provided at inner sides of the first face and the second face, respectively, being constituted by the outer first batten, the corner first thermal insulation member, and the inner first batten; and an inner bending portion constituted by filling a thermal insulation member between the inner first fixing portion and the inner second fixing portion. 3.The liquefied gas storage tank according to claim 2, characterized in that the corner first thermal insulation member is a high-density polyurethane foam, the thermal insulation member of the inner bending portion is a low-density polyurethane foam. 4.The liquefied gas storage tank according to claim 2, characterized in that the corner first barrier wall is configured to be fixed to the inner first batten of the inner first fixing portion and the inner first batten of the inner second fixing portion, and to be bent from an inner surface of the thermal insulation member of the inner bending portion. 5.The liquefied gas storage tank according to claim 1, characterized in that the corner second thermal insulation wall includes: an outer first fixing portion and an outer second fixing portion fixed to inner sides of the first face and the second face, respectively, being constituted by an inner second batten, a corner second thermal insulation member, and an outer second batten configured in order to an outer side of the corner second barrier wall, a side surface facing the outer first fixing portion fixed to the first face and the outer second fixing portion fixed to the second face being configured to be inclined in a direction in which the corner portion is divided. ​ 6. The liquefied gas storage tank according to claim 1, wherein the thickness of the corner primary insulation wall of the corner block connected with the flat primary insulation wall of the flat block and the thickness of the corner secondary insulation wall of the corner block connected with the flat secondary insulation wall of the flat block are the same or similar.

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