Corner structure and liquefied gas storage tank with the same

Abstract

Disclosed is a liquefied gas storage tank corner structure (100) for supporting a seal wall (51, 52) for preventing leakage of liquefied gas provided at a corner of a liquefied gas storage tank. The corner structure (100) can include two thermal insulation members (110) arranged in a direction different from each other on an inner surface of a hull structure wall, and a running member (130) provided on each thermal insulation member (110) for engagement of the seal wall (51, 52). The running member (130) is coupled so as to be slidable with respect to the thermal insulation member (110), and a plurality of running members (130) can be arranged in a straight line at a spaced interval from each other with respect to one thermal insulation member.

Description

TECHNICAL FIELD

[0001] The present application relates to a corner structure of a liquefied gas storage tank, and more particularly, to a corner structure arranged in such a manner that a sealing wall can be provided at a corner portion inside a liquefied gas storage tank for storing a liquid in a super-low temperature state, i.e., liquefied gas. BACKGROUND

[0002] Generally, liquefied gas includes liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquefied ethane gas, liquefied ethylene gas, liquefied nitrogen, liquefied carbon dioxide, liquefied ammonia, etc.

[0003] For example, liquefied natural gas is liquefied from natural gas, which is one of fossil fuels, and liquefied natural gas storage tanks are classified into land storage tanks installed on the ground or buried in the ground, or mobile storage tanks installed on a vehicle, a ship, or the like, according to installation locations.

[0004] The liquefied gas such as liquefied natural gas or liquefied petroleum gas has a risk of explosion when an impact is applied thereto, and is stored in a super-low temperature state. The storage tank for storing the liquefied gas has a structure for firmly maintaining impact resistance and liquid tightness.

[0005] Also, compared to a land storage tank in which flow is almost not generated, a liquefied gas storage tank installed on a vehicle or a ship in which flow is generated should take measures against mechanical stress caused by the flow. However, a liquefied gas storage tank installed on a ship having measures against mechanical stress can also be used in a land storage tank, and thus, the structure of a liquefied gas storage tank installed on a ship will be described as an example in the present specification.

[0006] A ship in which a liquefied gas such as liquefied natural gas is installed generally has a double structure of a hull including an outer wall constituting an outer shape and an inner wall formed inside the outer wall. The outer wall and the inner wall of the ship are connected to be integrated by a connecting wall, and a single structure of a hull in which the inner wall is not present can also be included according to circumstances.

[0007] In addition, the inside of the hull, i.e., the inside of the inner wall, can be divided by one or more partition walls. The partition wall can also be formed by a known cofferdam installed on a conventional LNG carrier or the like.

[0008] Each internal space divided by the partition wall can be used as a storage tank for storing a super-low temperature liquid such as liquefied natural gas.

[0009] The inner circumferential wall of the storage tank is sealed by a sealing wall in a liquid-tight state. That is, the sealing wall is integrally connected to each other by welding a plurality of metal plates, thereby forming a storage space, so that the storage tank can store and transport liquefied natural gas without leakage.

[0010] The sealing wall is connected to the inner wall or the partition wall of the ship by a plurality of anchoring structures. Therefore, the sealing wall cannot be relatively moved with respect to the ship body.

[0011] A heat insulating wall is arranged between the sealing wall and the inner wall or the partition wall to form a heat insulating layer. The heat insulating wall can include: a corner structure disposed at a corner portion of the storage tank; an anchoring structure disposed around an anchoring member; and a flat structure disposed at a flat portion of the storage tank. That is, the overall heat insulating layer can be formed in the storage tank by the corner structure, the anchoring structure, and the flat structure.

[0012] The anchoring structure includes an anchoring member directly connected between the ship body and the sealing wall to be fixed, and a heat insulating material provided around the anchoring member.

[0013] In addition, the sealing wall is mainly supported by the anchoring structure, and the flat structure only supports the load of LNG applied to the sealing wall, and there is no direct coupling relationship between the flat structure and the anchoring structure.

[0014] Figure 1 is a sectional view showing a corner portion of a conventional liquefied natural gas storage tank.

[0015] As shown in Figure 1 A conventional liquefied natural gas storage tank (10) sequentially provides a secondary heat insulating wall (22, 32, 42) and a primary heat insulating wall (24, 34, 44) on an inner wall (12) or a partition wall (14) as a ship body structure, thereby insulating between the inside and the outside of the storage tank. In addition, a secondary sealing wall (23, 33, 43) is provided between the secondary heat insulating wall (22, 32, 42) and the primary heat insulating wall (24, 34, 44), and a primary sealing wall (50) is provided on the surface of the primary heat insulating wall (24, 34, 44), thereby achieving secondary sealing between the inside and the outside of the storage tank.

[0016] The LNG storage tank (10) constructed in this way includes a corner structure (20) provided at an inner corner portion, an anchoring structure (30) provided at a bottom surface at a fixed interval, and a flat structure (40) configured to be slidably moved between the corner structure (20) and the anchoring structure (30) or between the anchoring structures (30). At this time, the corner structure (20), the anchoring structure (30), and the flat structure (40) can be respectively pre-manufactured as unit modules and assembled to the storage tank (10), and a primary sealing wall (50) is provided to be liquid-tight, thereby providing a space in which LNG can be stored in an inner space.

[0017] As shown in Figure 1 the corner structure (20), the anchoring structure (30), and the flat structure (40) can respectively include a primary insulation wall (24, 34, 44), a secondary insulation wall (22, 32, 42), and a secondary sealing wall (23, 33, 43).

[0018] On the other hand, in each structure (20, 30, 40), the secondary sealing wall of each unit module and the contact surface of each insulation wall can be bonded to be integrated using an adhesive. In general, the secondary insulation wall (22, 32, 42) includes polyurethane foam (PUF) as an insulation material and a plate material attached to a lower portion thereof. Also, the primary insulation wall (24, 34, 44) includes polyurethane foam and a plate material attached to an upper portion thereof using an adhesive. In addition, the primary sealing wall is provided at an upper portion of the primary insulation wall (24, 34, 44) and is fixed to the anchoring structure (30) by welding.

[0019] In addition, a flange (42a) larger than the secondary insulation wall (42) is formed at a lower end portion of the secondary insulation wall (42) of the flat structure (40). The flange (42a) is inserted into a groove portion formed at a lower end portion of the anchoring structure (30) and is provided to be slightly slidably moved.

[0020] In the illustrated example, each anchoring structure (30) has an anchoring support bar (36), a fixing member (37) at a lower portion, an anchoring secondary insulation wall (32), and an anchoring primary insulation wall (34), and the secondary sealing wall 33 is connected between the anchoring secondary insulation wall (32) and the anchoring primary insulation wall (34). One end of the anchoring support bar (36) is connected to the primary sealing wall (50), and the other end is connected to the inner hull wall (12) through the fixing member (37).

[0021] On the other hand, the primary sealing wall (50) is welded and combined at an upper end of the anchoring support bar (36) of the anchoring structure (30).

[0022] Further, the anchoring structure (30) is positioned at the connection points of the adjacent flat structures (40) to connect them to each other, and the flat structures (40) are fixed to the inner wall (12) or the partition wall (14) of the hull constituting the storage tank (10). Further, the fixing members (37) of the anchoring structure (30) are provided around the anchoring support rods (36).

[0023] However, in the conventional LNG storage tank, the structure of the heat insulating wall includes a primary and a secondary heat insulating wall, and a secondary seal wall interposed therebetween, and the structure is complicated. Furthermore, the structure for connecting the secondary seal walls of the unit modules to each other is complicated, and the connection work is not easy. Further, since the structure and the setting work of the anchoring portion or the connection portion of the secondary seal wall are difficult, there is a concern that the sealing reliability of LNG on the secondary seal wall is reduced, and LNG leaks.

[0024] Further, the conventional corner structure (20) which supports only the load of LNG applied to the seal wall (50) and does not join the seal wall (50) has room for improvement in absorbing the stress generated when the heat deformation of the storage tank or the deformation of the hull due to the loading and unloading of LNG in a super-low temperature state.

[0025] Further, in recent years, as the engine performance is improved, the consumption of boil-off gas (BOG) is reduced, and thus the demand for a lower boil-off rate (BOR) is gradually increasing. If the thickness of the heat insulating structure is increased to improve the heat insulating performance, the weight increases, the shrinkage amount of the heat insulating structure to a sloshing impact increases, and thus there is a problem that the relative displacement between the seal wall and the anchoring structure further increases. Therefore, there is a concern that the sealing reliability of LNG on the seal wall is reduced, and LNG leaks.

[0026] Therefore, in the manufacture of the storage tank, it is necessary to continuously strive to improve the work efficiency and reduce the construction time and cost by reducing the weight of each unit module while maintaining the heat insulating performance of the heat insulating structure. SUMMARY

[0027] PROBLEMS TO BE SOLVED BY THE INVENTION

[0028] To solve the problems, the object of the present application is to provide a corner structure of a liquefied gas storage tank, the structure of which is improved so that the structure of the heat insulating wall and the seal wall in the liquefied gas storage tank and the combined structure thereof are simplified and the work is facilitated, the reliability of the seal is improved, the assembly structure and the manufacturing process are simplified to shorten the drying time of the tank, and mechanical stress generated in the corner portion in the storage tank is more effectively eliminated.

[0029] MEANS FOR SOLVING THE PROBLEMS

[0030] According to an aspect of the present application, a corner structure of a liquefied gas storage tank, which is provided at a corner of a storage tank storing liquefied gas to support a sealing wall for preventing leakage of liquefied gas, includes two heat insulation members disposed in an orientation direction different from each other on an inner surface of a hull structure wall, and a running member provided on each of the heat insulation members for the sealing wall to be engaged, the running member being coupled to the heat insulation member in a manner that is slidable with respect to the heat insulation member, and a plurality of the running members are arranged in a straight line at intervals from each other with respect to one of the heat insulation members.

[0031] According to an embodiment, the sealing wall includes a primary membrane and a secondary membrane, and the running member includes a primary engagement portion for the primary membrane to be engaged, a secondary engagement portion formed in a manner that is stepped from the primary engagement portion for the secondary membrane to be engaged, and a flange portion extending from the secondary engagement portion for coupling to the heat insulation member, and the flange portion is slidably interposed between upper plates of the heat insulation member including two plywood boards, whereby the heat insulation member and the running member are coupled in a manner that is slidable with respect to each other.

[0032] According to an embodiment, the secondary engagement portion and the flange portion are formed by bending one metal plate, and the primary engagement portion is formed by attaching a metal bar having a rectangular cross section or a profiled section steel formed by bending one metal plate to the secondary engagement portion. According to an embodiment, the secondary engagement portion and the flange portion are formed by bending one metal plate, and the primary engagement portion is formed by attaching a metal bar having a rectangular cross section or a profiled section steel formed by bending one metal plate to the secondary engagement portion.

[0033] According to an embodiment, the heat insulation material can include a lower plate and an upper plate in a flat plate shape, a lower heat insulation material laminated on the lower plate, and an upper heat insulation material interposed between the lower heat insulation material and the upper plate, and the upper heat insulation material and the lower heat insulation material are made of the same heat insulation material.

[0034] According to an embodiment, the density of the lower heat insulation material can be lower than or equal to the density of the upper heat insulation material.

[0035] According to an embodiment, an intermediate heat insulation material can be further included, which is disposed in a space surrounded by the two heat insulation members oriented in different directions and the hull structure wall.

[0036] The density of the intermediate heat insulation material can be lower than or equal to the density of the upper heat insulation material and the lower heat insulation material.

[0037] According to an embodiment, the corner structure can further include a curved member disposed between the upper plates of the two heat insulation members to support the sealing wall, a surface facing the inside of the storage tank being formed in a curved shape.

[0038] According to an embodiment, the heat insulating member includes two upper plates, the operation member includes an engaging portion for the sealing wall to engage and a flange portion extending from the engaging portion, a first upper plate of the two upper plates located lower includes a recess portion in which the flange portion is mountable, and a second upper plate located above the first upper plate includes an opening portion through which the engaging portion is penetrable, and the flange portion is interposed between the first upper plate and the second upper plate in the recess portion.

[0039] According to an embodiment, the length and width of the recess portion are greater than or equal to the length and width of the flange portion, and the length and width of the opening portion are greater than the length and width of the engaging portion.

[0040] According to another aspect of the present application, a liquefied gas storage tank can be provided, which includes a corner structure provided at a corner for supporting a sealing wall for preventing leakage of liquefied gas, the corner structure including two heat insulating members disposed on an inner surface of a hull structure wall in a manner of being oriented in different directions, and operation members provided on each of the heat insulating members for the sealing wall to engage, the operation members being combined in a manner of being slidable with respect to the heat insulating members, and a plurality of the operation members being arranged in a straight line at intervals from each other with respect to one of the heat insulating members.

[0041] According to an embodiment, a flat structure can be disposed around the corner structure, the flat structure including a secondary heat insulating panel provided on the hull structure wall, and a primary heat insulating panel attached to the secondary heat insulating panel to be adjacent to the sealing wall, a primary heat insulating material included in the primary heat insulating panel and a secondary heat insulating material included in the secondary heat insulating panel being made of the same raw material heat insulating material, and the secondary heat insulating material having a density lower than or equal to a density of the primary heat insulating material.

[0042] According to an embodiment, the sealing wall can include a primary membrane directly contacted with liquefied gas, and a secondary membrane provided at a fixed interval from the primary membrane, and a support plate interposed between the primary membrane and the secondary membrane for fixedly maintaining the interval.

[0043] Effects of Invention

[0044] As described above, according to the present application, a corner structure of a liquefied gas storage tank, the structure of which is improved in a manner of simplifying the structure of a heat insulating wall and a sealing wall in a liquefied gas storage tank and a combined structure thereof and making work easy while improving the reliability of sealing, simplifying an assembly structure and a manufacturing process to shorten a drying time of a tank, and more effectively eliminating mechanical stress generated in a corner portion in a storage tank, can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1is a cross-sectional view showing a portion of a liquefied natural gas tank of the related art;

[0046] Figure 2 is a perspective view showing a corner structure of an embodiment of the present application, and is a view showing a portion of a primary and secondary membrane and a flat structure together;

[0047] Figure 3 is a cross-sectional view of a corner structure of an embodiment of the present application;

[0048] Figures 4 to 8 is a cross-sectional view showing an assembly process of a corner structure of an embodiment of the present application;

[0049] Figure 9 is a perspective view showing an operating member which is disposed in a manner that it can be displaced with respect to an insulating member of a corner structure of an embodiment of the present application;

[0050] Figure 10 is Figure 9 is an enlarged perspective view of the operating member shown in

[0051] Figure 11 is a main portion cross-sectional view showing a state in which a corner structure of an embodiment of the present application is joined with a primary and secondary membrane.

[0052] Figure 12 is a cross-sectional view showing various embodiments of an operating member;

[0053] Figure 13 is a perspective view showing various embodiments of an operating member;

[0054] Figure 14 is a cross-sectional view of a corner structure of another embodiment of the present application;

[0055] Figure 15 is a cross-sectional view of a corner structure of still another embodiment of the present application. DETAILED DESCRIPTION

[0056] Hereinafter, a configuration and an action of an embodiment of the present application will be explained in detail with reference to the accompanying drawings. In addition, the following embodiment can be modified into a plurality of different modes, and a range of the present application is not limited to the following embodiment.

[0057] In this specification, the terms "upper part" and "lower part" are used based on the corner structures or planar structures attached to the hull structural walls before forming the tank, not on the entire tank. These corner structures or planar structures can be attached not only to the bottom of the tank but also to the ceiling and side walls. For example, when the corner structures or planar structures are attached to the bottom of the tank, the "upper part" and "lower part" of each corner structure or planar structure have the same orientation as the "upper part" and "lower part" of the entire tank. However, when the corner structures or planar structures are attached to the ceiling or side walls of the tank, the "upper part" and "lower part" of each corner structure or planar structure have different orientations than the "upper part" and "lower part" of the entire tank.

[0058] and Figure 1 Similar to the storage tank shown, an embodiment of the present invention provides a liquefied gas storage tank formed by a corner structure (100) and a planar structure (300), which has an insulating wall and a sealing wall stacked on the hull (12, 14). However, unlike... Figure 1 Compared to conventional storage tanks where secondary insulation walls, secondary sealing walls, primary insulation walls, and primary sealing walls are sequentially and alternately layered, a storage tank with a corner structure and a planar structure according to an embodiment of the present invention has a sealing wall provided on the insulation wall, and no sealing wall is placed between the insulation walls. The insulation wall can be formed by arranging multiple modular insulation structures (e.g., corner structure (100), planar structure (300), etc.) on the structural walls (12, 14) of the hull.

[0059] Figure 2 This is a perspective view showing a corner structure according to an embodiment of the present invention. Figure 3 It means along Figure 2 A cross-sectional view taken from plane AA. Figure 2 The diagram shows a primary and secondary diaphragms (51, 52) and a portion of a planar structure (300) together with the corner structure (100) of one embodiment of the present invention. The shapes of the primary and secondary diaphragms (51, 52) and the planar structure (300) are not limited to the shapes shown in the diagram.

[0060] like Figure 2 and Figure 3 As shown, a corner structure (100) according to one embodiment of the present invention includes: a heat insulation member (110) disposed at a location capable of housing a storage tank (10) (see reference). Figure 1 The walls that divide the internal space of the ship's hull in a manner similar to (12) (see reference). Figure 1 ) or partition wall (14) (reference) Figure 1 The surface of the hull structure wall; and the operating parts (130), supported on the heat insulation parts (110), for engagement with the diaphragms (51, 52) for sealing.

[0061] The operation member (130) is arranged so as to be slightly displaced (as described below) with respect to the thermal insulation member (110) in the event of thermal deformation due to temperature changes caused by loading and unloading LNG in a super-low temperature state or ship body deformation caused by waves and the like. That is, the operation member (130) and the thermal insulation member (110) are configured so as to be relatively displaceable.

[0062] According to an embodiment of the present application, the thermal insulation member (110) can be configured so as to have a coupling structure with the operation member (130) but not have a coupling structure with the ship body structure walls (12, 14). As described below, the thermal insulation member (110) is simply rested on the ship body structure walls (12, 14) with the aid of the putty (18) and can not be coupled by an extra mechanical coupling structure.

[0063] Each thermal insulation member (110) can be made of a thermal insulation material such as a polyurethane foam raw material and plywood. The present application is not limited to the raw material and the structure of the thermal insulation member (110) included in the corner structure (100).

[0064] The thermal insulation member (110) can include a lower plate (112), a lower thermal insulation material (114), an upper thermal insulation material (118), and upper plates (122, 124). The lower plate (112) can include one piece of plywood, and the upper plates (122, 124) can include two pieces of plywood. The thermal insulation member (110) can also be configured to further include an intermediate plate (116) interposed between the lower thermal insulation material (114) and the upper thermal insulation material (118). In this case, the intermediate plate (116) can include one piece of plywood. Figures 3 to 8 The thermal insulation member (110) having the intermediate plate (116) is illustrated in the middle, Figure 14 and Figure 15 The thermal insulation members (110A, 110B) not having the intermediate plate are illustrated in the left and right. Of course, the present application is not limited to the presence or absence of the intermediate plate, the structure and shape of the thermal insulation member, and the like.

[0065] The upper thermal insulation material (118) and the lower thermal insulation material (114) can be made of the same raw material, such as polyurethane foam (PUF) or reinforced-polyurethane foam (R-PUF), and the lower thermal insulation material (114) can be foamed so as to have a density value lower than or equal to that of the upper thermal insulation material (118). For example, the upper thermal insulation material (118) can have a density of 80 to 240 kg / m 3The upper insulation material (118) that is relatively close to the liquefied gas at the extremely low temperature is made to have a relatively high density, thereby improving the insulation performance, and the lower insulation material (114) that is relatively distant from the liquefied gas at the extremely low temperature (closer to the hull structure wall side) is made to have a relatively low density, thereby being able to reduce the weight of the insulation member (110). Thus, it is possible to simultaneously achieve both the increase in the BOR of the storage tank and the weight reduction.

[0066] A protective layer (not shown) of glass wool raw material that protects the upper insulation material (118) and the lower insulation material (114) can be provided on the side surface of the insulation member (110).

[0067] Although not shown, in the case where the lower insulation material (114) is made to have a relatively low density to such an extent that strength reinforcement is required, the insulation member (110) can include one or more reinforcement plates 113 (not shown) that connect the lower plate (112) and the intermediate plate (116) in order to reinforce the lower insulation material (114). The reinforcement plate can be made of plywood. In the case where a plurality of reinforcement plates are provided in the lower insulation material (114), the plurality of reinforcement plates can be arranged in parallel with each other. The number of reinforcement plates provided can be different depending on the size of the insulation member (110) or the density of the lower insulation material (114).

[0068] The above illustrates the use of reinforcement plates arranged in parallel to reinforce the lower insulation material (114) of the insulation member (110), but a modification such as the use of an insulation tank made of plywood raw material or the arrangement of reinforcement plates in a lattice shape can also be implemented. In addition, the insulation member (110) can be formed of a single layer of insulation material (i.e., the intermediate plate (116) is omitted) in the same manner as the intermediate insulation material (140) described below, in addition to having a two-layer structure of an upper insulation material and a lower insulation material.

[0069] Mastic (18) can be interposed between the insulation member (110) and the hull structure wall (12, 14). According to the corner structure (100) of the present embodiment, only the mastic (18) is interposed between the insulation member (110) and the hull structure wall (12, 14), and it is possible to not have a fixing structure for fixing the insulation member (110) of the corner structure (100) to the hull structure wall (12, 14), such as a mechanical fixing member like a stud and a nut.

[0070] The operating component (130) includes: a primary engagement portion (132) for engaging a primary diaphragm (51); a secondary engagement portion (134) formed with respect to the primary engagement portion (132) for engaging a secondary diaphragm (52); and a flange portion (136) extending from the secondary engagement portion (134) for engaging with the heat insulation component (110). The flange portion (136) of the operating component (130) is slidably disposed between the upper plates (122, 124) of the heat insulation component (110), which comprises two plywood sheets, thereby connecting the heat insulation component (110) and the operating component (130).

[0071] For example, the secondary joint (134) and the flange (136) can be formed by bending a metal plate (e.g., SUS with a thickness of 3t), and the primary joint (132) can be formed by attaching a metal rod with a rectangular cross section (e.g., SUS with a thickness of 13t) to the secondary joint (134).

[0072] As described above, the diaphragm for sealing includes: a primary diaphragm (51) that is in direct contact with the liquefied gas and forms a primary sealing wall; and a secondary diaphragm (52) that forms a secondary sealing wall. A primary joint (132) and a secondary joint (134) may be formed in the operating component (130) so that the primary diaphragm (51) and the secondary diaphragm (52) are joined by, for example, welding, with a fixed interval. The height difference between the primary joint (132) and the secondary joint (134) may be set to be the same as the interval formed between the primary diaphragm (51) and the secondary diaphragm (52).

[0073] A support plate (53) for maintaining the spacing and supporting the load of the goods may be placed between the primary diaphragm (51) and the secondary diaphragm (52). The support plate (53) may be made of plywood, for example.

[0074] Figure 2 and Figure 3 The corner structure (100) shown is configured, for example, such that two of the multiple walls forming the tank are positioned at a corner where they are connected at a 90-degree angle, and two insulation members (110) are oriented at a 90-degree angle. When two of the multiple walls forming the tank are connected at an angle other than 90 degrees (e.g., 30 degrees, 45 degrees, 60 degrees, 108 degrees, 116 degrees, 135 degrees, 270 degrees, etc.), the insulation members (110) can be oriented according to that angle. In the following description and drawings, a 90-degree corner structure (100) is used as an example, but this is merely an example, and the present invention is not limited to the angle formed by the corner structure (100).

[0075] The space partitioned by the two thermal insulation members (110) oriented in different directions and the hull structure walls (12, 14) can be filled with an intermediate thermal insulation material (140) in a shape corresponding to the respective space. In Figure 2 and Figure 3 In the intermediate thermal insulation material (140), the cross-sectional shape is substantially square, but the shape of the intermediate thermal insulation material (140) can be different depending on the angle of the two thermal insulation members (110). The intermediate thermal insulation material (140) can be made of PUF or R-PUF having a density of 40 to 240 kg / m 3 , for example.

[0076] The gap between the thermal insulation members (110) and the intermediate thermal insulation material (140) can be filled with a thermal insulation material such as glass wool. The glass wool can have a density of less than 90 kg / m 3 , for example. The glass wool can have a density of 20 to 50 kg / m 3 , for example.

[0077] The corner portion of the intermediate thermal insulation material (140), i.e., the corner portion of the portion adjacent to the two thermal insulation members (110) Figure 4 In this case, the corner portion of the upper right portion of the intermediate thermal insulation material (140) can be chamfered to prevent breakage.

[0078] The thermal insulation member can have a structure deformed in such a manner as to be fixed to the hull structure wall in a mechanical manner like a stud bolt and a nut, for example. In addition, the thermal insulation member can also have a structure deformed in such a manner as to be fixed by an adjacent planar structure.

[0079] The corner structure (100) of an embodiment of the present application can further include a curved member (150) having a surface toward the inside of the tank formed as a curved surface. The curved member (150) can include a phospholipid-water preparation (PLW) or a high-density polyurethane foam (e.g., PUF having a density of 80 to 240 kg / m 3 , for example. Alternatively, the curved member (150) can include an organic thermal insulation material having a cellular structure, for example. The curved member (150) is disposed between the upper plates (122, 124) of the two thermal insulation members (110) to support the diaphragms (51, 52).

[0080] Figures 4 to 8 is a cross-sectional view illustrating an assembly process of the corner structure of an embodiment of the present application, Figure 9 is a perspective view illustrating an operation member disposed in a manner displaceable with respect to the thermal insulation member, Figure 10 is a partially enlarged plan view showing the operation plate of the corner structure and the upper plate of the thermal insulation member, Figure 11is a main part sectional view showing a corner structure to which a primary and secondary diaphragm is joined.

[0081] The corner structure (100) of one embodiment of the present application can be produced as a module by integrally attaching the operating member (130) to the thermal insulation member (110). The thermal insulation member (110) to which the operating member (130) is attached can be produced at a site where a ship having a storage tank is built, or can be produced as a module at a nearby or remote place and transported to the site.

[0082] As shown in Figure 4 , Figure 10 and Figure 11 , the operating member (130) is slidably coupled to the upper plates (122, 124) of the thermal insulation member (110). Specifically, a recessed portion (122a) to which a flange portion (136) of the operating member (130) is fitted is formed in a first upper plate (122) (plywood of 15t) of the two upper plates of the thermal insulation member (110), and an opening portion (124a) into which a secondary joining portion (134) of the operating member (130) is inserted is formed in a second upper plate (124) (plywood of 15t).

[0083] The length and width of the recessed portion (122a) have values greater than the length and width of the operating member (130). The length of the opening portion (124a) has a value greater than the length of the secondary joining portion (134) of the operating member (130). The width of the opening portion (124a) has a value greater than or equal to the width of the secondary joining portion (134) of the operating member (130). As shown in Figure 10 , a gap (a, b) is formed between the opening portion (124a) and the secondary joining portion (134) of the operating member (130). Further, as shown in Figure 11 , a gap is also formed between the side wall surface of the recessed portion (122a) and the flange portion (136) of the operating member (130).

[0084] Thus, by sequentially laminating the first upper plate (122), the operating member (130), and the second upper plate (124) so that the first upper plate (122) and the second upper plate (124) are fixed to each other, the operating member (130) is slidably interposed between the first upper plate (122) and the second upper plate (124).

[0085] A partition (126) can be provided between the secondary joining portion (134) of the operating member (130) and the bottom surface of the recessed portion (122a) of the first upper plate (122). The partition (126) can be integrally formed with the first upper plate (122), or can be formed as a separate member. A gap is formed between the partition and the flange portion (136).

[0086] AsFigure 5 As shown, the curved surface member (150) is positioned between the two heat insulating members (110). The two side edges of the curved surface portion (152) of the curved surface member (150) are close to the operation members (130), but do not contact the operation members (130).

[0087] As shown, the curved surface member (150) is positioned between the two heat insulating members (110). The two side edges of the curved surface portion (152) of the curved surface member (150) are close to the operation members (130), but do not contact the operation members (130). Figures 6 to 8 As shown, the curved surface member (150) is positioned between the two heat insulating members (110). The two side edges of the curved surface portion (152) of the curved surface member (150) are close to the operation members (130), but do not contact the operation members (130).

[0088] The secondary film (52) is joined to the secondary joining portion (134) of the operation member (130). The secondary film (52) can include a secondary curved surface portion (52a) which is, for example, a portion bent at 90 degrees, and a secondary flat surface portion (52b) formed in a flat plate shape. The secondary curved surface portion (52a) extends between two operation members (130) disposed on different heat insulating members (110), has a substantially circular arc cross section, and is curved in a circular shape so as to be mountable to the curved surface portion (152) of the curved surface member (150). The secondary flat surface portion (52b) can have a wrinkle to cope with thermal deformation of the film.

[0089] The support plate (53) is layered on the secondary film (52). Like the secondary film, the support plate (53) can include a curved surface portion support plate (53a) which is, for example, a portion bent at 90 degrees, and a flat surface portion support plate (53b) formed in a flat plate shape. The secondary curved surface portion (52a) extends between two operation members (130) disposed on different heat insulating members (110), has a substantially circular arc cross section, and is curved in a circular shape so as to be mountable to the curved surface portion (152) of the curved surface member (150). The curved surface portion support plate (53a) can also be made of reinforced-polyurethane foam.

[0090] The primary film (51) is joined to the primary joining portion (132) of the operation member (130). Like the secondary film (52), the primary film (51) can include a primary curved surface portion (51a) which is, for example, a portion bent at 90 degrees, and a primary flat surface portion (51b) formed in a flat plate shape. The primary curved surface portion (51a) extends between two operation members (130) disposed on different heat insulating members (110), has a substantially circular arc cross section, and is curved in a circular shape so as to be mountable to the curved surface portion support plate (53a). The primary flat surface portion (51b) can have a wrinkle to cope with thermal deformation of the film.

[0091] The support plate (53) can be interposed in the portions where the primary and secondary films (51, 52) are arranged in parallel to each other, that is, the remaining entire portions except for the portions where the wrinkle is formed, but can also be interposed in the remaining portions except for the portions where the wrinkle is formed.

[0092] As the support plate (53), a support plate made of a fixed thickness of plywood alone, a support plate made of a fixed thickness of polyurethane foam (or reinforced polyurethane foam) alone, or a support plate in which a plywood is attached to a polyurethane foam (or reinforced polyurethane foam) can be used.

[0093] As shown in FIG. 6, a plurality of (for example, two) operating members (130) can be arranged in a straight line on one heat insulating member (110). Thus, for example, a corner structure (100) including two heat insulating members (110) oriented at a specific angle can have a total of four operating members (130). The operating members (130) arranged in a straight line on one heat insulating member (110) can be connected using a sheet-like sealing material such as a three-ply sheet. Figure 9 As described above, the operating member (130) is made in such a manner that a primary bonding portion (134) for bonding a primary sheet (51) is attached to a secondary bonding portion (134) for bonding a secondary sheet (52). In the case where the primary bonding portion (132) and the secondary bonding portion (134) are bonded by welding, at least one of the primary bonding portion (132) and the secondary bonding portion (134) of the operating member (130) is distorted by heat generated at the time of welding.

[0094] In the case where two operating members are arranged in a straight line with respect to one heat insulating member (110), the length of the operating member (130) can be shortened compared to the case where one longer operating member is arranged with respect to one heat insulating member (110), thereby reducing the amount of distortion. Further, the overall weight of the operating member used in the corner structure can be reduced.

[0095] In the case where one relatively long operating member is arranged with respect to one heat insulating member (110), for example, the length of the operating member is 1800 mm, and the amount of distortion due to welding is 7 to 8 mm. In contrast, in the case where two relatively short operating members are arranged in a straight line with respect to one heat insulating member (110), for example, the length of each operating member is 500 to 760 mm, and the amount of distortion due to welding is approximately 1 to 1.5 mm.

[0096] Further, in the case where one relatively long operating member is arranged with respect to one heat insulating member (110), the total weight of the operating member (two) used in one corner structure is 33.4 kg. In contrast, in the case where two relatively short operating members are arranged in a straight line with respect to one heat insulating member (110), the total weight of the operating member (four) used in one corner structure is only 24 to 28 kg.

[0097] Further, in the case where one relatively long operating member is arranged with respect to one heat insulating member (110), the total weight of the operating member (two) used in one corner structure is 33.4 kg. In contrast, in the case where two relatively short operating members are arranged in a straight line with respect to one heat insulating member (110), the total weight of the operating member (four) used in one corner structure is only 24 to 28 kg.

[0098] As described above, if two or more operating members (130) are arranged in a straight line with respect to one thermal insulation member (110), the amount of deformation that can occur when the operating member (130) is manufactured can be reduced, and the total weight of the operating member (130) used in one corner structure can be reduced, so that a corner structure that is light and accurate can be manufactured.

[0099] On the other hand, as described above, when loading or unloading cargo or when an external force is applied at sea, the operating member (130) and the thermal insulation member (110) can be displaced relative to each other due to deformation of the hull or the membrane, and the like. As shown in Figure 10 Figure 11 As shown, because the size of the recessed portion (122a) formed in the first upper plate (122) of the thermal insulation member (110) is larger than the size of the flange portion (136) of the operating member (130), and the size of the opening portion (124a) formed in the second upper plate (124) of the thermal insulation member (110) is larger than the size of the secondary engaging portion (134) of the operating member (130), even if displacement occurs, the displacement can be absorbed.

[0100] In addition, in the case where the membrane (51, 52) shrinks due to thermal deformation caused by loading liquefied gas, the operating member (130) to which the membrane (51, 52) is engaged also shrinks. At this time, both side ends of the operating member (130) can be slightly displaced by sliding toward the central portion of the operating member. As described above, the flange portion (136) of the operating member (130) is slidably interposed between the first upper plate (122) and the second upper plate (124), so that even if the operating member (130) shrinks and expands, the combined state of the operating member (130) with respect to the thermal insulation member (110) can be continuously maintained.

[0101] As described above, the storage tank (10) is sealed in a liquid-tight state by the primary and secondary membranes (51, 52). That is, the storage tank (10) is formed by connecting a plurality of metal plates in one body by welding to form one storage space surrounded by two layers of sealing walls, so that the storage tank (10) can store and transport liquefied gas without leakage.

[0102] As is well known, a wrinkle can be formed in the primary membrane (51) that directly contacts liquefied gas such as LNG in a super-low temperature state, and in the secondary membrane (52) that is disposed in a spaced-apart manner from the primary membrane (51) to cope with temperature changes caused by loading and unloading liquefied gas. The shape, size, and the like of the primary membrane (51) and the secondary membrane (52) including the wrinkle portion are not limited to those shown in the drawings.

[0103] Such a primary and secondary membrane (51, 52) can be indirectly connected to the hull structure wall (12, 14) by a plurality of corner structures (100) and an anchoring structure (not shown).​

[0104] Referring again to Figure 2 and Figure 3 , the planar structure (300) can be arranged around the corner structure (100). The planar structure (300) differs from the heat insulation member (110) of the corner structure (100) in that it has a structure in which a primary heat insulation panel (310) and a secondary heat insulation panel (320) are laminated.

[0105] As shown in Figure 2 and Figure 3 , the planar structure (300) of an embodiment of the present application for forming a heat insulation wall can include a primary heat insulation panel (310) and a secondary heat insulation panel (320), which can be integrated by being adhered to each other by, for example, PU bonding.

[0106] The primary heat insulation panel (310) and the secondary heat insulation panel (320) of the planar structure (300) can be made of, for example, a heat insulation material of a polyurethane foam raw material and plywood. In more detail, the primary heat insulation panel (310) of the planar structure (300) closer to the side of the sealed wall can include a primary heat insulation material (314) made of, for example, a polyurethane foam or the like, and a primary upper panel (312) and a primary lower panel (316) adhered to the upper and lower surfaces of the primary heat insulation material (314). The adhesion between the primary heat insulation material (314) and the primary upper and lower panels (312, 316) can be achieved by, for example, PU bonding.

[0107] In addition, the secondary heat insulation panel (320) of the planar structure (300) closer to the side of the hull structure wall can include a secondary heat insulation material (324) made of, for example, a polyurethane foam or the like, and a secondary upper panel (322) and a secondary lower panel (326) laminated on the upper and lower surfaces of the secondary heat insulation material (324).

[0108] According to the present application, the planar structure (300) is made of two layers by attaching the primary heat insulation panel (310) and the secondary heat insulation panel (320), thereby better blocking the inflow of heat from the outside to the inside of the storage tank (10).

[0109] The planar structure (300) made by attaching the primary heat insulation panel (310) and the secondary heat insulation panel (320) to each other is pre-manufactured in a factory in a modularized manner, and the modularized unit planar structures (300) are transported to a site and installed to the hull structure wall for the manufacture of the storage tank.

[0110] A protective layer (not shown) of glass wool raw material can be provided on the side surface of the flat structure (300) to protect the primary insulation material (314) and the secondary insulation material (324). A heat insulating material such as glass wool can be provided between the corner structure (100) and the flat structure (300).

[0111] The above illustrates the use of reinforcing plates arranged in parallel to reinforce the secondary insulation material (324) of the flat structure (300), but a heat insulating box using plywood raw material, or reinforcing plates arranged in a lattice pattern, or the like can be used. In addition, the flat structure (300) can be formed of a single layer of heat insulating material, like the intermediate heat insulating material (140), in addition to having a two-layer structure of primary and secondary insulation materials.

[0112] Mastic (18) can be provided between the flat structure (300) and the hull structure wall (12, 14). The flat structure (300) according to the present embodiment can also have a fixing structure for fixing the flat structure (300) to the hull structure wall (12, 14), such as a mechanical fixing member (not shown) like a stud and nut.

[0113] An anchor unit (not shown) for supporting a sealing wall can be provided in the center of the upper surface of the flat structure (300). In the case where the flat structure (300) includes an anchor unit, the flat structure (300) having the anchor unit can function as an anchor structure. In the production of a liquefied gas storage tank, the anchor structure and the flat structure can be appropriately arranged as needed and fixed to the hull structure wall.

[0114] Like the heat insulating member (110) of the corner structure (100), the flat structure (300) is modularized and preassembled in a factory, and the modularized individual flat structures are transported to a site and fixed to the hull structure wall for the production of a storage tank.

[0115] The corner structures (100), the anchor structures, and the flat structures arranged in the storage tank (10) can be produced as separate modules at separate sites and transferred to the storage tank (10) for assembly. By modularization, workability in the production of a storage tank can be improved.

[0116] The primary and secondary membranes (51, 52) are supported by the corner structure (100) and the anchor structure, and the flat structure supports only the load of LNG applied to the primary and secondary membranes (51, 52). In addition, the flat structure can be configured in a manner not directly coupled to the corner structure (100) or the anchor structure.

[0117] As described above, according to one embodiment of the present invention, the primary diaphragm (51) and the secondary diaphragm (52) are separated by a support plate (53) and no insulating material is provided between them. Most conventional heat barrier structures provide a primary insulating wall between the primary and secondary sealing walls that are directly in contact with the LNG, thus requiring a complex structure to support the primary sealing wall via the primary insulating wall and the secondary sealing wall. However, the corner structure (100) of the present invention is constructed such that no insulating material performing a separate insulating function is provided between the primary and secondary diaphragms (51, 52), thus allowing the primary and secondary diaphragms (51, 52) to be supported relatively easily via the primary and secondary joint of the operating component (130).

[0118] In addition, according to the present invention, the primary diaphragm (51) and the secondary diaphragm (52) are separated, so even if the shape of the tank is deformed due to the deformation of the hull caused by external forces such as waves, there will be no friction between the primary and secondary diaphragms (51, 52). Even if the diaphragm on one side is damaged by an impact, the damage can be prevented from being directly transmitted to the diaphragm on the other side.

[0119] On the other hand, the seal is described as a double-layer structure consisting of primary and secondary membranes (51, 52), but it can certainly be achieved by stacking three or more layers into a multi-layer structure.

[0120] Furthermore, according to the present invention, the operating component (130) with the primary and secondary diaphragms (51, 52) is connected in a manner that allows it to slide slightly relative to the heat insulation component (110) (as described above), thereby allowing the primary and secondary diaphragms (51, 52) to be stably supported on the hull. Therefore, stresses caused by thermal deformation due to LNG loading and unloading or by hull deformation due to external forces such as waves can be reliably absorbed.

[0121] like Figure 12 As shown, the primary engagement of the operating component (130) can be made of a metal rod with a rectangular cross-section or a bent metal plate. Figure 12 (a) shows a cross-sectional view of the operating component (130) before assembly, which has a primary joint (132) made of a metal rod. Figure 12 (b) indicates that it is formed by bending a metal sheet. A cross-sectional view of the moving part (130A) of the primary joint (132A) made of U-shaped steel before assembly.

[0122] Furthermore, the operating component of the present invention can be like... Figure 13 The same deformation is shown. Figure 13(a) of FIG. 1 indicates a first modification example of the operating member (130') in which two first engaging portions (132') of a relatively short length are arranged in a straight line at an interval on one secondary engaging portion (134') of a relatively long length. The length of the flange portion (136') can be the same as the length of the secondary engaging portion (134').

[0123] Figure 13 (b) of FIG. 1 indicates a second modification example of the operating member (130") in which one primary engaging portion (132") of a relatively long length is engaged on two secondary engaging portions (134") of a relatively short length. Unlike the operating member (130') of the first modification example, the operating member (130") of the second modification example is engaged in such a manner that the two secondary engaging portions (134") are arranged in a straight line at an interval on one primary engaging portion (132"). The length of the flange portion (136") can be the same as the length of the secondary engaging portion (134").

[0124] Figure 14 FIG. 2 is a cross-sectional view of a corner structure according to another embodiment of the present application. Figure 14 The corner structure (100A) shown in FIG. 2 includes an operating member (130) having the same configuration as the operating member (130) included in the corner structure (100) shown in FIG. 1. Figure 3 The operating member (130) included in the corner structure (100) shown in FIG. 2 has the same configuration as the operating member (130) included in the corner structure (100) shown in FIG. 1. In addition, Figure 14 The corner structure (100A) shown in FIG. 2 is also the same as the corner structure (100) shown in FIG. 1 in that the operating member (130) is combined so as to be slidable with respect to the heat insulating member (110A), and a plurality of operating members (130) are arranged in a straight line at an interval with respect to one heat insulating member (110A). However, the corner structure (100A) shown in FIG. 2 is different from the corner structure (100) shown in FIG. 1 in that Figure 3 Figure 3 Figure 14 The corner structure (100A) shown in FIG. 2 is different from the corner structure (100) shown in FIG. 1 in the structure of the heat insulating member.

[0125] Hereinafter, the differences between the corner structure (100A) shown in FIG. 2 and the corner structure (100) shown in FIG. 1 will be described. In the corner structure (100A) shown in FIG. 2, Figure 14 Figure 3 Figure 14 In the corner structure (100A) shown in FIG. 2, the same or similar components as those of the corner structure (100) shown in FIG. 1 are given the same reference numerals, and detailed description thereof will be omitted. Figure 3

[0126] Figure 14 Figure 3 ​​​​​​The corner structure (100) of the present embodiment differs in that there is no intermediate board between the upper heat insulating material (118A) and the lower heat insulating material (114A) of the heat insulating member (110A). Thus, the upper heat insulating material (118A) and the lower heat insulating material (114A) can be in direct contact. In addition, the size of the upper heat insulating material (118A) and the size of the lower heat insulating material (114A) can be different. For example, in the corner structure (100A) of the present embodiment, the upper heat insulating material (118A) is larger than the lower heat insulating material (114A), and thus a portion of the upper heat insulating material (118A) protrudes from the end surface of the lower heat insulating material (114A). Figure 14

[0127] Figure 14 The corner structure (100A) of the present embodiment can have a first upper board (122A) that is smaller in size than a second upper board (124A). For example, in the corner structure (100A) of the present embodiment, the first upper board (122A) is disposed only in a portion necessary for achieving the coupling of the operation member (130) in addition to having a size that covers the entire surface of the upper heat insulating material (118A). Figure 14

[0128] On the other hand, referring to Figure 14 , the planar structure (300A) also differs from the planar structure (300) shown in Figure 3 . Figure 14 The planar structure (300A) of the present embodiment has an upper heat insulating material (314A) and a lower heat insulating material (324A), and there is no board of the plywood raw material between the upper heat insulating material (314A) and the lower heat insulating material (324A). Thus, the upper heat insulating material (314A) and the lower heat insulating material (324A) can be in direct contact. The size of the upper heat insulating material (314A) and the size of the lower heat insulating material (324A) of the planar structure (300A) can be different. For example, in the planar structure (300A) of the present embodiment, the upper heat insulating material (314A) can be smaller than the lower heat insulating material (324A). Figure 14

[0129] For ease of illustration, in Figure 14 , the primary and secondary diaphragms (51, 52) are illustrated only once on the corner structure (100A) and are omitted on the planar structure (300A).

[0130] Figure 15 A cross-sectional view of a corner structure representing another embodiment of the present application is shown. Figure 15 The corner structure (100B) shown includes an operation member (130) having the same configuration as the operation member (130) included in the corner structure (100) shown in Figure 3 . In addition, Figure 15 ​​​the corner structure (100B) is also the same as the corner structure (100) of Figure 3 in that the operation member (130) is combined so as to be slidable with respect to the thermal insulation member (110B), and a plurality of operation members (130) are arranged in a straight line at intervals with respect to one thermal insulation member (110B). However, compared with the corner structure (100) of Figure 3 , the corner structure (100B) of Figure 14 differ in the structure of the thermal insulation member.

[0131] Hereinafter, the differences between the corner structure (100B) of Figure 15 and the corner structure (100) of Figure 3 will be described with the corner structure (100B) of Figure 15 as the center. In the corner structure (100B) of Figure 3 , the same or similar components as those of the corner structure (100) of are given the same reference numerals, and detailed description thereof will be omitted.

[0132] Figure 3 The corner structure (100) of Figure 15 arranges an intermediate thermal insulation material (140) between two thermal insulation members (110B), but the corner structure (100B) of Figure 15 does not use an intermediate thermal insulation material, but changes the shape of the thermal insulation member (110B) so that the thermal insulation members (110B) directly contact each other. For example, as shown in , in the case where the two thermal insulation members (110B) are oriented at an angle of 90 degrees, the side surfaces of the two thermal insulation members (110B) where they contact each other can be formed as inclined surfaces (110Ba) at an angle of approximately 45 degrees.

[0133] Figure 15 The corner structure (100B) of Figure 3 differs from the corner structure (100) of in that there is no intermediate plate between the upper thermal insulation material (118B) and the lower thermal insulation material (114B) of the thermal insulation member (110B). Therefore, the upper thermal insulation material (118B) and the lower thermal insulation material (114B) can directly contact each other. In addition, the size of the upper thermal insulation material (118B) and the size of the lower thermal insulation material (114B) can be different. For example, in the corner structure (100B) of Figure 15 , the upper thermal insulation material (118B) is smaller than the lower thermal insulation material (114B), and therefore a part of the lower thermal insulation material (114B) can protrude from the end surface of the upper thermal insulation material (118B).

[0134] In addition, Figure 15The corner structure (100B) may include an upper auxiliary insulation material (117B) and a lower auxiliary insulation material (115B) arranged (i.e., arranged in opposite directions to the directions in which the two insulation components (110B) are adjacent to each other) between the insulation component (110B) and the planar structure (300B). The lower auxiliary insulation material (115B) may be arranged between the lower insulation material (114B) and the planar structure (300B), and the upper auxiliary insulation material (117B) may be arranged between the upper insulation material (118B) and the planar structure (300B). For example, in Figure 15 In the corner structure (100B), the upper auxiliary insulation material (117B) can be larger than the lower auxiliary insulation material (115B).

[0135] exist Figure 15 In the corner structure (100B), the first upper plate (122B) and the second upper plate (124B) may have approximately the same dimensions.

[0136] On the other hand, refer to Figure 15 The planar structure (300B) is also similar to Figure 3 There are differences between the planar structures (300) shown. Figure 15 The planar structure (300B) has an upper insulation material (314B) and a lower insulation material (324B), and there is no plywood material between the upper insulation material (314B) and the lower insulation material (324B). Therefore, the upper insulation material (314B) and the lower insulation material (324B) can be in direct contact. The dimensions of the upper insulation material (314B) and the lower insulation material (324B) of the planar structure (300B) can be different. For example, in Figure 15 In the planar structure (300B), the upper insulation material (314B) may be smaller than the lower insulation material (324B).

[0137] For ease of illustration, Figure 15 In the diagram, primary and secondary membranes (51, 52) are shown only on the corner structure (100B), while primary and secondary membranes (51, 52) are omitted on the planar structure (300B).

[0138] Figure 15 The planar structure (300B) shown can be used with Figure 14 The planar structure shown (300A) is the same.

[0139] The heat insulation materials, heat insulation components, or heat insulation substances used in the above embodiments of the present invention may include, for example, glass wool, mineral wool, polyester filler, polyurethane foam, melamine foam, polyethylene foam, polypropylene foam, silicone foam, polyvinyl chloride foam, etc.

[0140] Further, in the above-described embodiment of the present application, it is described that the diaphragm includes corrugated stainless steel used for GTT Mark-III, but the diaphragm can include mild steel used for, for example, GTT No. 96.

[0141] Furthermore, the present application is not only applicable to liquefied gas storage tanks provided inside a ship hull, but can of course also be applied to liquefied gas storage tanks provided on land.

Claims

1. A corner structure for a liquefied gas storage tank, which is disposed at the corner of the storage tank containing liquefied gas, characterized in that... include: Two thermal insulation components are arranged on the inner surface of the hull structural wall in a manner that is aligned in different directions; Sealed walls to prevent liquefied gas leakage; as well as Operating components are disposed on each of the heat insulation components for engagement with the sealing walls; The operating components are coupled in a manner that allows them to slide relative to each of the heat-insulating components. Relative to each of the aforementioned heat-insulating components, the plurality of said operating components are spaced apart from each other and arranged in a straight line. The sealing wall includes a primary diaphragm and a secondary diaphragm. The operating component includes: a primary engagement portion for engaging the primary diaphragm; and a secondary engagement portion formed with respect to the primary engagement portion for engaging the secondary diaphragm. and the flange portion, which extends from the secondary joint portion for engagement with each of the aforementioned heat insulation components; The flange is slidably disposed between the upper plates of each of the heat insulation components, which comprise two plywood sheets, thereby allowing each heat insulation component to be coupled to the operating component in a manner that allows for relative sliding displacement. The secondary joint and the flange are formed by bending a metal plate, and the primary joint is formed by attaching a rectangular metal rod to the secondary joint or by bending a metal plate. It is formed by steel sections in the shape of the Chinese character "".

2. The corner structure of the liquefied gas storage tank according to claim 1, characterized in that: Each of the aforementioned heat insulation components includes: a lower plate and an upper plate in the shape of a flat plate; a lower heat insulation material laminated on the lower plate; and an upper heat insulation material disposed between the lower heat insulation material and the upper plate; The upper insulation material and the lower insulation material are made of the same raw materials.

3. The corner structure of the liquefied gas storage tank according to claim 2, characterized in that: The density of the lower insulation material is lower than or equal to the density of the upper insulation material.

4. The corner structure of the liquefied gas storage tank according to claim 1, characterized in that... Also includes: The intermediate insulation material is disposed within the space surrounded by two insulation components aligned in different directions and the hull structural wall.

5. The corner structure of the liquefied gas storage tank according to claim 2, characterized in that... Also includes: The intermediate thermal insulation material is disposed within the space surrounded by two thermal insulation components aligned in different directions and the hull structural wall; The density of the intermediate insulation material is lower than or equal to the density of the upper insulation material and the lower insulation material.

6. The corner structure of the liquefied gas storage tank according to claim 1, characterized in that... Also includes: A curved component, disposed between the upper plates of the two insulation components to support the sealing wall, has a curved surface facing the inside of the tank.

7. The corner structure of the liquefied gas storage tank according to claim 1, characterized in that: The lower plywood of the two plywoods includes a recess for mounting the flange, and the upper plywood includes an opening for the primary joint and the secondary joint to pass through. The flange portion is disposed within the recess between the first plywood and the second plywood.

8. The corner structure of the liquefied gas storage tank according to claim 7, characterized in that: The length and width of the recessed portion are greater than or equal to the length and width of the flange portion, and the length and width of the opening portion are greater than the length and width of the secondary joint portion.

9. A liquefied gas storage tank, comprising a corner structure disposed at one of its corners, characterized in that, The corner structure includes: Two thermal insulation components are arranged on the inner surface of the hull structural wall in a manner that is aligned in different directions; Sealed walls to prevent liquefied gas leakage; and Operating components are disposed on each of the heat insulation components for engagement with the sealing walls; The operating components are coupled in a manner that allows them to slide relative to each of the heat-insulating components. Relative to each of the aforementioned heat-insulating components, the plurality of said operating components are spaced apart from each other and arranged in a straight line. The sealing wall includes a primary diaphragm and a secondary diaphragm. The operating component includes: a primary engagement portion for engaging the primary diaphragm; a secondary engagement portion formed at a step difference from the primary engagement portion for engaging the secondary diaphragm; and a flange portion extending from the secondary engagement portion for engaging with each of the heat insulation components. The flange is slidably disposed between the upper plates of each of the heat insulation components, which comprise two plywood sheets, thereby allowing each heat insulation component to be coupled to the operating component in a manner that allows for relative sliding displacement. The secondary joint and the flange are formed by bending a metal plate, and the primary joint is formed by attaching a rectangular metal rod to the secondary joint or by bending a metal plate. It is formed by steel sections in the shape of the Chinese character "".

10. The liquefied gas storage tank according to claim 9, characterized in that: A planar structure is arranged around the corner structure. The planar structure includes: a secondary heat insulation panel disposed on the hull structural wall; and a primary heat insulation panel attached to the secondary heat insulation panel and adjacent to the sealing wall. The primary insulation material included in the primary insulation panel and the secondary insulation material included in the secondary insulation panel are made of the same raw material, and the density of the secondary insulation material is lower than or equal to the density of the primary insulation material.

11. The liquefied gas storage tank according to claim 9, characterized in that: The sealing wall includes: a primary diaphragm that is in direct contact with the liquefied gas; and a secondary diaphragm that is arranged at a fixed interval from the primary diaphragm. A support plate is disposed between the primary diaphragm and the secondary diaphragm to fixally maintain the interval.

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