Dihedral-corner-area arrangement structure of thin-film-type enclosure system

Abstract

A dihedral-corner-area arrangement structure of a thin-film-type enclosure system. The thin-film-type enclosure system comprises a main-layer thin film layer (34), a fastening attachment plate (35), a main-layer insulating layer (33), a secondary-layer thin film layer (32) and a secondary-layer insulating layer (31), which are sequentially fixedly connected to a ship body by means of penetrating fasteners (28), wherein the thin film layers and the insulating layers enclose a storage tank for accommodating an ultra-low-temperature medium. A corner area where two side faces intersect with each other comprises a main-layer dihedral corner area (57) and a secondary-layer dihedral corner area (58), wherein the main-layer dihedral corner area (57) comprises a main-layer dihedral-corner-area thermally insulating module (60); and the secondary-layer dihedral corner area (58) comprises a dihedral-corner-area secondary insulating module (50) bonded and fixed to a ship body structure, and a dihedral-corner-area planar transition secondary insulating module (70) fixedly connected to the ship body structure by means of the penetrating fasteners (28). The dihedral-corner-area secondary insulating module (50) comprises a first bottom plate (51), a thermally insulating block (52) and a metal welding plate (53). The dihedral-corner-area planar transition secondary insulating module (70) comprises a secondary-layer welding metal piece (4), a secondary-layer welding plate (71), a second top plate (72), a heat-preservation block (76), a cross-shaped reinforcing structure (77) and a second bottom plate (80).

Description

A dihedral corner area arrangement structure of a membrane type enclosure system

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311517051.7 filed on November 14, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present application relates to the technical field of equipment for transporting and storing cryogenic liquids, and in particular to a dihedral area arrangement structure of a membrane-type enclosure system. Background Art

[0004] When transporting gases like natural gas and ethane over long distances, it's common to cool the gas to low temperatures and liquefy it for more economical transport. This liquefied gas significantly reduces its volume, lowering transportation costs. The liquefied cryogenic liquid is stored and transported in specialized cryogenic cargo tanks.

[0005] In the current shipbuilding industry, cryogenic liquid cargo containment systems primarily involve the construction of LNG vessels. For LNG vessels, the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) defines four main types of containment systems: Type A, Type B, Type C, and membrane. Membrane containment systems are widely used due to their advantages, including high tank capacity utilization, excellent thermal insulation, and reduced wind resistance.

[0006] Existing membrane containment systems mainly include Mark III and NO 96, both of which are from the French company GTT. However, both containment systems have their own shortcomings. For the NO 96, due to the overlapping arrangement of its primary and secondary corner insulation modules, the gaps between the primary insulation modules in the dihedral corner area and the gaps between the secondary insulation modules in the dihedral corner area are directly connected to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, there is still a large amount of heat leakage in the gaps. For the Mark III, because the primary insulation modules in the dihedral corner area, the secondary insulation modules in the dihedral corner area and the secondary membrane layer are all fixed to each other by glue and fixed to the hull structure as a whole by epoxy resin, the relative movement between the primary and secondary insulation modules in the dihedral corner area is restricted, and the overall resistance to hull movement and liquid cargo sloshing is poor. In addition, the extensive use of glue leads to a long construction period. Due to the strict requirements on the construction environment (humidity and temperature) and process, the delivery of the entire ship is delayed.

[0007] Summary of the Invention

[0008] In view of the above-mentioned problems existing in the prior art, an embodiment of the present application provides a film-type enclosure system, which is used to accommodate ultra-low temperature media, including a main film layer, a fastening card plate, a main insulating layer, a secondary film layer, and a secondary insulating layer, which are sequentially connected and fixed to the hull structure (hull steel plate) through penetrating fasteners. That is, a main insulating layer and a fastening card plate are provided between the main film layer and the secondary film layer, and a secondary insulating layer is provided between the secondary film layer and the hull structure. The fastening card plate, the main insulating layer, the secondary film layer, and the secondary insulating layer are all connected and fixed to the hull structure through penetrating fasteners, and at the same time, form a main shielding space with the main insulating structure and gap between the secondary film layer, and form a secondary shielding space with the secondary insulating structure and gap between the secondary film layer and the hull structure, effectively building a double-layer sealed ultra-low temperature medium storage carrier, solving the storage and leakage prevention problems of the ultra-low temperature medium.

[0009] The embodiment of the present application provides a dihedral corner area arrangement structure of a film-type enclosure system, wherein the film-type enclosure system includes a main film layer, a fastening card plate, a main insulating layer, a secondary film layer, and a secondary insulating layer, which are sequentially connected and fixed to the hull structure by penetrating fasteners. The main film layer, the main insulating layer, the secondary film layer, and the secondary insulating layer enclose a low-temperature liquid cargo storage tank for accommodating ultra-low temperature medium, and the main film layer is in contact with the ultra-low temperature medium; in the corner area where two side surfaces intersect in the film-type enclosure system, there are a main dihedral corner area and a secondary dihedral corner area, wherein,

[0010] The main layer dihedral corner area includes a main layer dihedral corner area thermal insulation module, which includes a first top plate, an upper insulation block, a middle plate, and a lower insulation block fixedly connected in sequence, wherein the first top plate is provided with a through-type stress relief groove according to the structure covered thereon, the upper insulation block includes two rectangular insulation blocks arranged at a first angle, and the upper insulation block is provided with a non-through-type stress relief groove aligned with the through-type stress relief groove provided on the first top plate;

[0011] The secondary dihedral area includes a dihedral area secondary insulation module bonded and fixed to the hull structure and a dihedral area plane transition secondary insulation module fixedly connected to the hull structure via a through-fastener;

[0012] The dihedral area secondary insulation module includes a first bottom plate, a heat insulation block and a metal welding plate, wherein the first bottom plate consists of two pieces, which are respectively arranged parallel to the dihedral area structure of the hull and fixed on the hull structure;

[0013] The dihedral angle area planar transition secondary insulation module includes a secondary layer welded metal sheet, a secondary layer welded plate, a second top plate, four insulation blocks, a cross reinforcement structure, a second bottom plate, a pressed sheet insulation block and a pressed plate plate. Four insulation blocks are arranged between the second top plate and the second bottom plate. The four insulation blocks are fixed in the space formed by the second top plate, the second bottom plate and the cross reinforcement structure. The cross reinforcement structure is provided with two central support structures. A through hole is provided in the middle of the central support structure for installing a through fastener. The second top plate and the second bottom plate are both provided with installation and fixing holes corresponding to the through holes on the central support structure.

[0014] In some embodiments of the present application, in the main layer dihedral area insulation module, the first top plate includes two rectangular plates arranged at a first angle, the first angle is determined according to the angle of the dihedral angle of the hull dihedral area structure, and the range of the first angle is 80 to 160 degrees, the rectangular area of ​​the upper insulation block is larger than the first top plate, the first top plate is located in the middle of the rectangle of the upper insulation block, the lower insulation block includes two rectangular insulation blocks arranged at the first angle, and the middle plate is arranged on the upper insulation block Between the upper insulation block, the middle plate and the lower insulation block, installation notches for installing through fasteners are provided at the four vertices and midpoints of the long sides of the upper insulation block, the middle plate and the lower insulation block. Fixed pads are provided at the four vertices of the middle plate. The fixed pads are located in the lower insulation block and are adapted to the shape of the installation notches on the lower insulation block. The fixed pads are fixedly connected to the lower insulation block. The bottom of the lower insulation block is provided with an adaptation groove for accommodating the raised structure on the sub-layer film according to the shape and arrangement of the sub-layer film in contact with it.

[0015] In some embodiments of the present application, the thermal insulation block is arranged on the side of the first bottom plate away from the hull structure, and the second angle between the two side surfaces of the thermal insulation block away from the first bottom plate is determined according to the angle of the dihedral angle of the hull dihedral angle zone structure, and the range of the second angle is 80~160°, the thermal insulation block is bonded and fixed to the first bottom plate, and the periphery of the thermal insulation block coincides with the periphery of the first bottom plate; the thermal insulation block is formed with a stepped notch groove parallel to the straight line at the intersection of the two side surfaces at the outer edges of the two side surfaces away from the first bottom plate, and a spacing plunger hole for fixed installation of the sub-layer dihedral angle zone is provided on a step plane parallel to the side surface where the stepped notch groove is located in the stepped notch groove, and the thermal insulation block is laid with a metal welding plate for welding and fixing to the sub-layer thin film layer at other positions on the two side surfaces away from the first bottom plate, and adjacent thermal insulation blocks are bonded and fixed.

[0016] In some embodiments of the present application, in the dihedral angle area planar transition secondary insulation module, a welding plate groove and a welding sheet groove are provided on the top of the second top plate. After the secondary layer welding plate and the secondary layer welding metal sheet are installed in the welding plate groove and the welding sheet groove respectively, the upper surface of the secondary layer welding plate and the upper surface of the secondary layer welding metal sheet are flush with the upper surface of the second top plate. The secondary layer welding metal sheet is provided with a connection hole for installing a through fastener. The two insulation blocks at one end where the dihedral angle area planar transition secondary insulation module contacts the dihedral angle area secondary insulation module are formed with an installation notch groove on one side of the second top plate. The installation notch groove is located on the side close to the dihedral angle area secondary insulation module and is arranged corresponding to the stepped notch groove. After the dihedral angle area planar transition secondary insulation module and the dihedral angle area secondary insulation module are fitted together, the pressing plate plate is simultaneously bonded and fixed to the bottom of the stepped notch groove and the bottom of the installation notch groove. The gap between the pressing plate insulation block and the pressing plate plate and the side wall of the stepped notch groove is filled with low-density flexible insulation material, and the upper part of the pressing plate insulation block is bonded and fixed to the second top plate.

[0017] In some embodiments of the present application, when the secondary insulation module in the dihedral angle area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate, strips of epoxy resin are adhered between the first bottom plate and the side wall of the hull structure at a certain distance, and the height of the epoxy resin between the first bottom plate and the side wall of the hull structure is set to be greater than 12 mm and less than 20 mm according to the distance between the epoxy resins.

[0018] In some embodiments of the present application, the through fastener includes: a through fastener upper portion and a through fastener lower portion, wherein:

[0019] The upper section of the through-fastener consists of a cap rod structure, a compression block, a stud screw, and a metal sealing cap. The compression block is installed in the installation notches on the upper insulation blocks of the two adjacent main layer dihedral insulation modules and the upper insulation blocks of the two main layer insulation layers. The lower portion of the compression block fits against the fixed pad, and the stud screw and metal sealing cap lock the compression block.

[0020] The lower part of the through-fastener includes a cylindrical welding base and a metal connecting rod with threads at both ends. One end of the metal connecting rod passes through the secondary welding metal sheet and is fixedly connected to the cap rod structure of the upper part of the through-fastener, and the other end is welded and fixed to the hull structure through the set cylindrical welding base. The metal connecting rod is inserted into the through hole of the central support structure of the dihedral angle area plane transition secondary insulation module.

[0021] In some embodiments of the present application, the first top plate, the middle plate, the second top plate, the cross reinforcement structure, the first bottom plate, and the second bottom plate are all made of a low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can withstand a temperature of at least -196 degrees Celsius, and the strength must meet the following requirements, specifically,

[0022] Vertical compression strength is greater than or equal to 4Mpa, bending strength is greater than or equal to 20Mpa, horizontal tensile strength is greater than or equal to 25Mpa, vertical tensile strength is greater than or equal to 1.5Mpa, and shear strength is greater than or equal to 2.5Mpa.

[0023] The upper insulation block, the lower insulation block, the heat-insulating block and the insulation block are all made of materials that meet the set thermal conductivity requirements, wherein the set thermal conductivity requirements are that the thermal conductivity is not greater than 0.1 W / m·K.

[0024] In some embodiments of the present application, the main film of the secondary film layer is made of Invar steel or 304L stainless steel that is prefabricated into a predetermined corrugated shape.

[0025] In some embodiments of the present application, a plurality of main layer films having a first preset size are spliced ​​together by welding.

[0026] In some embodiments of the present application, the connecting gaps between the dihedral corner area structure of the membrane enclosure system and the dihedral corner area plane transition secondary insulation module and the main layer insulation module of the adjacent plane area are arranged in a horizontal "J"-shaped gap path.

[0027] In some embodiments of the present application, a distance plate is further included. The distance plate is provided on the bulkhead according to the markings of the bulkhead of the hull structure, and is used to place a welding base for welding the lower portion of the through-fastener at the position of the through-fastener, and is used to position the planar transition secondary insulation module of the secondary dihedral angle area and the distance plate of the dihedral angle area secondary insulation module. The distance plate is made of plywood or a plastic alternative material that meets the rigidity requirements, and has a thickness of at least one of 1 mm, 2 mm, 5 mm, or 10 mm. The distance plate is used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom of the dihedral angle area planar transition secondary insulation module and the dihedral angle area secondary insulation module and the bulkhead is 10 mm.

[0028] The diameter of the through hole on the distance plate is 0.5-2 mm larger than the outer diameter of the thread on the stud.

[0029] In some embodiments of the present application, the cross reinforcement structure, except for the pressure plate, has its periphery overlapped with the second top plate and is connected to the second top plate by glue or rivets;

[0030] The second bottom plate, except for the pressure plate, has its periphery overlapped with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets;

[0031] The insulation block coincides with the periphery of the second top plate, the second bottom plate and the cross reinforcement structure;

[0032] The contact points between the heat-insulating block, the second top plate, the second bottom plate and the cross reinforcement structure are all connected and fixed by glue.

[0033] In some embodiments of the present application, the pressing plate is located at the bottom of the groove formed by the butt joint of the step notch groove and the installation notch groove, and is bonded and fixed to the adjacent insulation block by glue, and the pressing plate extends out of the second bottom plate near the dihedral angle area of ​​the secondary layer;

[0034] The sheeting insulation block is located between the second top plate and the pressing plate;

[0035] The contact points between the pressed sheet heat-insulating block and the second top plate, the pressed plate and the heat-insulating block are fixedly connected by glue.

[0036] The contact points between the fixed pad and the lower insulation block are connected and fixed with glue.

[0037] Compared with the prior art, the beneficial effects of the dihedral area structure of the thin film-type enclosure system provided in the embodiment of the present application are: the main layer insulation module of the dihedral area and the secondary layer insulation module of the dihedral area are staggered, reducing the overall heat leakage at the gap; at the same time, the secondary layer insulation module of the dihedral area is bonded to the hull structure with epoxy resin, and the main layer insulation module of the dihedral area is connected by a through fastener. Since the through fastener has an elastic compression block, the main layer insulation module of the dihedral area and the secondary layer insulation module of the dihedral area have relative motion tolerance, and are more stable and capable of absorbing low-temperature deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic diagram of a trihedral corner area arrangement structure in a film-type enclosure system provided by an embodiment of the present application;

[0039] FIG2 is a schematic diagram of the dihedral corner area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0040] FIG3 is a schematic diagram of the arrangement of insulation modules in the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0041] FIG4 is a schematic diagram of the arrangement of insulation modules in the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0042] FIG5 is a schematic diagram of the insulating module structure in the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0043] FIG6 is an exploded schematic diagram of the insulation module structure of the main layer dihedral corner area in the dihedral corner area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0044] FIG7 is an exploded schematic diagram of the through-fasteners in the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0045] FIG8 is a schematic diagram of the dihedral angle sub-layer plane transition module structure in the dihedral angle area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0046] FIG9 is an exploded schematic diagram of the dihedral angle sub-layer plane transition module structure in the dihedral angle area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0047] Reference numerals 1, welding base; 2, nut; 3, metal connecting rod; 3a, threaded cut; 4, secondary welding metal sheet; 10, through-fastener lower section; 11, cap rod structure; 19, long bolt; 21, pressing block; 22, stud screw; 23, metal sealing cap; 24, primary welding metal sheet; 25, through-fastener upper section; 26, first angle; 27, second angle; 28, through-fastener; 29, epoxy resin; 3 1. Secondary insulation layer; 31a. Secondary insulation module; 32. Secondary film layer; 32a. Secondary film layer; 33. Main insulation layer; 33a. Main insulation module; 34. Main film layer; 34a. Main film layer; 35. Fastening plate; 35a. Cross plate; 35b. Straight plate; 36. Distance plate; 37. Stud; 38. Main welding plate; 39. Low-density flexible insulation material; 40. Slit path; 41. Plunger; 50. Secondary insulation module for dihedral angle area; 51. First bottom plate; 52. Insulation block; 53. Metal welding plate; 54. Distance plunger hole; 55. Distance bolt hole; 56. Step notch groove; 57. Main dihedral angle area; 58. Secondary dihedral angle area; 60. Insulation module for main dihedral angle area; 61. Upper insulation block; 62. Lower insulation block; 63. First top plate; 64. Middle plate; 65. Fixing pad; 66. Through-type Stress relief groove; 67. Non-penetrating stress relief groove; 68. Adaptation groove; 69. Notch; 70. Dihedral angle plane transition secondary insulation module; 71. Secondary layer welding plate; 72. Second top plate; 73. Welding plate groove; 74. Welding plate groove; 75. Pressed sheet insulation block; 76. Insulation block; 77. Cross reinforcement structure; 78. Through hole; 79. Center support structure; 80. Second bottom plate; 81. Pressed plate plate; 82. Installation notch groove. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0049] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0050] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0051] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0052] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0053] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0054] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0055] An embodiment of the present application provides a film-type containment system, as shown in Figures 1 to 9, which is used to accommodate ultra-low temperature media, including a main film layer 34, a fastening card plate 35, a main layer insulation layer 33, a secondary film layer 32 and a secondary insulation layer 31, which are sequentially connected and fixed to the hull structure (hull steel plate) through a through fastener 28, that is, a main layer insulation layer 33 and a fastening card plate 35 are arranged between the main film layer 34 and the secondary film layer 32, and a secondary insulation layer 31 is arranged between the secondary film layer 32 and the hull structure. The primary film layer 34, fastening card plate 35, primary insulating layer 33, secondary film layer 32, and secondary insulating layer 31 are all connected and fixed to the hull structure via through-fasteners 28. At the same time, the primary insulating structure and gap between the primary film layer 34 and the secondary film layer 32 form a primary shielding space, while the secondary insulating structure and gap between the secondary film layer 32 and the hull structure form a secondary shielding space, effectively building a double-layer sealed ultra-low temperature medium storage carrier and solving the storage and leakage prevention problems of ultra-low temperature media. Specifically,

[0056] A dihedral corner arrangement structure of a membrane-type containment system, the membrane-type containment system comprising a primary membrane 34a, a fastening plate 35, a primary insulation module 33a, a secondary membrane 32a, and a secondary insulation module 31a, which are sequentially connected and fixed to a hull structure via through-fasteners 28. The primary membrane 34a, the fastening plate 35, the primary insulation module 33a, the secondary membrane 32a, and the secondary insulation module 31a enclose a cryogenic liquid cargo storage tank for accommodating an ultra-low temperature medium, wherein the primary membrane 34a contacts the ultra-low temperature medium. In the corner area formed by two intersecting interfaces of the membrane-type containment system, a primary dihedral corner area 57 and a secondary dihedral corner area 58 are included, wherein:

[0057] The main layer dihedral area 57 only includes the main layer dihedral area thermal insulation module 60. The main layer dihedral area thermal insulation module 60 includes a first top plate 63, an upper insulation block 61, a middle plate 64 and a lower insulation block 62 which are fixedly connected in sequence. The first top plate 63 includes two rectangular plates arranged at a first angle 26. The first angle 26 is determined according to the angle of the dihedral angle of the hull dihedral area structure, and the range of the first angle 26 is 80 to 160 degrees. The first top plate 63 is provided with a through-type stress relief groove 66 according to the structure covered thereon. The upper insulation block 61 includes two rectangular insulation blocks arranged at the first angle 26. The upper insulation block 61 is provided with a non-through-type stress relief groove 67 which is aligned with the through-type stress relief groove 66 provided on the first top plate 63. The rectangular area of ​​the surface of the upper insulation block 61 is larger than that of the first top plate 63. The first top plate 63 is located in the middle of the rectangle on the surface of the upper insulation block 61. The lower insulation block 62 includes two rectangular insulation blocks arranged at a first angle 26. The middle plate 64 is arranged between the upper insulation block and the lower insulation block. The four vertices of the upper insulation block, the middle plate 64 and the lower insulation block 62 are provided with installation notches 69 for installing the through fasteners 28. The middle plate 64 is provided with fixed pads 65 at the four vertices. The fixed pads 65 are located in the lower insulation block 62 and are adapted to the shape of the installation notches 69 on the lower insulation block 62. The fixed pads 65 are fixedly connected to the lower insulation block 62. The bottom of the lower insulation block 62 is provided with an adaptation groove 68 for accommodating the protruding structure on the sub-layer film 32a according to the shape and arrangement of the sub-layer film 32a in contact with it.

[0058] The secondary dihedral area 58 includes a dihedral area secondary insulation module 50 bonded and fixed to the hull structure and a dihedral area plane transition secondary insulation module 70 fixedly connected to the hull structure via a through fastener 28;

[0059] The dihedral area secondary insulation module 50 includes a first bottom plate 51, a heat insulation block 52 and a metal welding plate 53. The first bottom plate 51 consists of two pieces, which are respectively arranged parallel to the dihedral area structure of the hull and fixed to the hull structure.

[0060] The heat-insulating block 52 is arranged on the side of the first bottom plate 51 away from the hull structure. The second angle 27 between the two side surfaces of the heat-insulating block away from the first bottom plate 51 is determined according to the angle of the dihedral angle of the hull dihedral angle zone structure, and the range of the second angle 27 is 80-160 degrees. The heat-insulating block 52 is bonded and fixed to the first bottom plate 51, and the periphery of the heat-insulating block 52 coincides with the periphery of the first bottom plate 51; the heat-insulating block 52 is on the two sides away from the first bottom plate 51. A stepped notch groove 56 is formed at the outer edge of the surface and is arranged parallel to the straight line where the two side surfaces intersect. A distance plunger hole 54 and a distance bolt hole 55 for distance installation of the dihedral angle area of ​​the sub-layer are provided on the step plane parallel to the side surface of the stepped notch groove. A metal welding plate 53 for welding and fixing to the sub-layer film layer 32 is laid on the upper part of the two side surfaces of the thermal insulation block 52 away from the first bottom plate 51. The welding metal plate is bonded and fixed to the thermal insulation block 52.

[0061] The dihedral angle area plane transition secondary insulation module 70 includes a secondary welded metal sheet 4, a secondary welded plate 71, a second top plate 72, four insulation blocks 76, a cross reinforcement structure 77, a second bottom plate 80, a pressed sheet insulation block 75 and a pressed plate plate 81, wherein a welding plate groove 74 and a welding plate groove 73 are provided on the top of the second top plate 72. After the secondary welded plate 71 and the secondary welded metal sheet 4 are respectively installed in the welding plate groove 74 and the welding plate groove 73, the upper surface of the welding plate and the upper surface of the secondary welded metal sheet 4 are flush with the upper surface of the second top plate. The secondary welded metal sheet 4 is provided with a connecting hole for installing a through fastener. Four insulation blocks 76 are provided between the second top plate 72 and the second bottom plate 80. The four insulation blocks 76 are fixed in the space formed by the second top plate 72, the second bottom plate 80 and the cross reinforcement structure 77. The cross reinforcement structure 77 is provided with two central support structures 79. The central support structure A through hole 78 for installing a through fastener 28 is provided in the middle of the structure 79, and the second top plate 72 and the second bottom plate 80 are both provided with installation and fixing holes corresponding to the through hole 78 on the central support structure 79. The two insulation blocks at one end where the dihedral angle area plane transition secondary insulation module 70 contacts the dihedral angle area secondary insulation module 50 are formed with an installation notch 82 on one side of the second top plate 72. The installation notch 82 is located on the side close to the dihedral angle area secondary insulation module 50 and is arranged corresponding to the stepped notch 56. After the dihedral angle area plane transition secondary insulation module 70 and the dihedral angle area secondary insulation module are fitted together, the bottom of the stepped notch 56 and the installation notch 82 are bonded and fixed, the pressed sheet insulation block 75 is bonded and fixed to the pressing plate plate 81, and the gap between the side wall of the stepped notch 56 and the side wall of the installation notch 82 is filled with low-density flexible insulation material, and the upper part of the pressed sheet insulation block 75 is bonded and fixed to the second top plate 72.

[0062] In some embodiments of the present application, when the secondary insulation module in the dihedral angle area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate 51, strips of epoxy resin 29 are adhered between the first bottom plate 51 and the side wall of the hull structure at a certain distance, and the height of the epoxy resin between the first bottom plate 51 and the side wall of the hull structure is set to be greater than 12 mm and less than 20 mm according to the distance between the epoxy resins.

[0063] In some embodiments of the present application, the through-fastener 28 includes: a through-fastener upper portion 25 and a through-fastener lower portion 10, wherein:

[0064] The upper portion 25 of the through-fastener comprises a cap rod structure 11, a clamping block 21, a double-headed screw 22, and a metal sealing cap 23. The clamping block 21 is positioned within the mounting notches 69 defined in the upper insulation blocks 61 of two adjacent main-layer dihedral-area insulation modules 60 and the upper insulation blocks 61 of two main-layer insulation modules 33a. The lower portion of the clamping block 21 engages with the fixing pad 65, and a long bolt 19 is provided on the clamping block 21 to secure it.

[0065] The lower portion 10 of the through-fastener includes a cylindrical welding base 1 and a metal connecting rod 3 with threads at both ends. One end of the metal connecting rod 3 passes through the secondary welding metal sheet 4 and is fixedly connected to the cap rod structure 11 of the upper portion of the through-fastener, and the other end is welded and fixed to the hull structure through the set cylindrical welding base 1. The metal connecting rod 3 is inserted into the through hole 78 of the central support structure 79 of the dihedral angle area plane transition secondary insulation module 70.

[0066] In some embodiments of the present application, the first top plate 63, the middle plate 64, the second top plate 72, the cross reinforcement structure 77, the first bottom plate 51 and the second bottom plate 80 are all made of a low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can withstand a temperature of at least -196 degrees Celsius and the strength must meet the following requirements, specifically,

[0067] Vertical compression strength is greater than or equal to 4Mpa, bending strength is greater than or equal to 20Mpa, horizontal tensile strength is greater than or equal to 25Mpa, vertical tensile strength is greater than or equal to 1.5Mpa, and shear strength is greater than or equal to 2.5Mpa.

[0068] The upper insulation block 61 , the lower insulation block 62 , the heat-insulating block 52 and the insulation block 76 are all made of materials that meet the set thermal conductivity requirement, wherein the set thermal conductivity requirement is that the thermal conductivity is not greater than 0.1 W / m·K.

[0069] In some embodiments of the present application, the connecting gaps between the dihedral corner area structure of the membrane enclosure system and the dihedral corner area plane transition secondary insulation module 70 and the main layer insulation module 33a of the adjacent plane area are arranged in a staggered manner in a horizontal "J"-shaped gap path 40.

[0070] In some embodiments of the present application, the distance plate 36 is provided on the bulkhead according to the markings of the bulkhead of the hull structure, and is used to place a welding base for welding the lower portion of the through-fastener at the position of the through-fastener, and is used to position the planar transition secondary insulation module of the secondary dihedral angle area and the distance plate of the dihedral angle area secondary insulation module. The distance plate 36 is made of plywood or a plastic alternative material that meets the rigidity requirements, and has a thickness of at least one of 1 mm, 2 mm, 5 mm, or 10 mm. The distance plate 36 is used for leveling. By stacking and combining distance plates 36 of different thicknesses, the distance between the bottom of the dihedral angle area planar transition secondary insulation module 70 and the dihedral angle area secondary insulation module and the bulkhead is a fixed value of 10-15 mm.

[0071] The diameter of the through hole on the distance plate 36 is larger than the outer diameter of the thread on the metal connecting rod 3 by 0.5-2 mm.

[0072] In some embodiments of the present application, the cross reinforcement structure 77, except for the pressure plate 81, overlaps with the second top plate 72 at the periphery thereof and is connected to the second top plate by glue or rivets;

[0073] The second bottom plate 80, except for the pressure plate 81, has its periphery overlapped with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets;

[0074] The insulation block 76 overlaps with the periphery of the second top plate 72 , the second bottom plate 80 , and the cross reinforcement structure 77 ;

[0075] The contact areas between the heat-insulating block 76, the second top plate 72, the second bottom plate 80 and the cross reinforcement structure 77 are all connected and fixed with glue.

[0076] In some embodiments of the present application, the pressure plate 81 is located at the bottom of the groove formed by the butt joint of the stepped notch groove 56 and the installation notch groove 82, and is bonded and fixed to the adjacent insulation block 76 by glue, and the pressure plate 81 is bonded and fixed to the stepped notch groove 56;

[0077] The sheeting insulation block 75 is located between the second top plate 72 and the pressing plate 81;

[0078] The contact points between the pressing plate heat-insulating block 75, the second top plate 72, the pressing plate 81 and the heat-insulating block 76 are fixedly connected by glue.

[0079] In some embodiments of the present application, the contact points between the fixed pad 65 and the lower insulation block 62 are connected and fixed with glue.

[0080] Specifically, when installing the dihedral area arrangement structure of the above-mentioned membrane type enclosure system, the installation method includes:

[0081] Marking the bulkhead of the hull structure, welding a welding base 1 for the lower portion 10 of the through-fastener and studs 37 for positioning the planar transition secondary insulation module and the dihedral secondary insulation module of the secondary dihedral area to the position of the through-fastener on the bulkhead according to the marking, installing a metal connecting rod 3 fixedly connected to the welding base 1, and installing the distance plate 36 on the studs 37; wherein, four through holes are provided at the four corners of the distance plate 36 symmetrically about the center line of the distance plate 36, and a stud 37 is passed through each through hole;

[0082] The stud 37 passing through the distance plate 36 extends into the distance plunger hole 54 opened on the bottom of the insulation block 76 and the installation notch groove 82 of the dihedral area plane transition secondary insulation module, or extends into the distance plunger hole 54 opened at the bottom of the stepped notch groove 56 of the dihedral area secondary insulation module. Specifically, one dihedral area secondary insulation module is equipped with a dihedral area plane transition secondary insulation module 70 connected thereto. At the same time, four distance plunger holes 54 are opened at the bottom of the stepped notch groove of the dihedral area secondary insulation module, and one distance plunger hole 54 is opened at each end of the bottom of the installation notch groove of the dihedral area plane transition secondary insulation module 70.

[0083] In this embodiment, the first bottom plate 51 and the second bottom plate 80 are each provided with an opening concentrically disposed with the through-hole. Furthermore, the second top plate 72, the thermal insulation block 52, and the thermal insulation block 76 are provided with a spacer plug hole 54 concentrically disposed with the corresponding through-hole and having a diameter 2-4 times that of the corresponding through-hole. This facilitates the use of tools such as washers and nuts to tighten the spacer plates 36. Furthermore, after the four studs provided on each spacer plate 36 are tightened with nuts 2, a plunger 41 made of the same material as the thermal insulation block is used to plug the spacer plug holes 54 provided on each dihedral area secondary insulation module 50 and dihedral area planar transition secondary insulation module 70. This allows interconnection between each dihedral area secondary insulation module 50 and dihedral area planar transition secondary insulation module 70, thereby providing auxiliary anchoring for both the dihedral area secondary insulation module 50 and the dihedral area planar transition secondary insulation module 70.

[0084] After the dihedral angle area secondary insulation module 50 and the dihedral angle area plane transition secondary insulation module 70 are installed on the distance plate 36, the through fastener 28 is installed, and the metal connecting rod 3 of the through fastener is inserted into the installation and fixing hole of the cross reinforcement structure 77 of the dihedral angle area plane transition secondary insulation module, and the cap rod structure 11 of the upper part of the through fastener is screwed and fixed to the metal connecting rod 3 and welded to the secondary layer welding metal sheet 4 embedded in the top plate. At the same time, the use of the distance plate 36, epoxy resin and the lower part of the through fastener 10 can effectively anchor the dihedral angle area secondary insulation module 50 and the dihedral angle area plane transition secondary insulation module 70 of the entire enclosure system to the bulkhead inside the ship.

[0085] The gap between the dihedral region secondary insulation module 50 and the dihedral region plane transition secondary insulation module 70 is filled with a low-density flexible insulation material 39 .

[0086] After the dihedral corner area planar transition sub-insulation module 70 and the dihedral corner area sub-insulation module 50 are installed, the sub-layer film layer 32 is installed. The sub-layer film 32a of the sub-layer film layer 32 is made of Invar steel or 304L stainless steel prefabricated into a set corrugated shape. The sub-layer film layer 32 includes a plurality of sub-layer films 32a with preset sizes connected in a splicing manner. In the corner area where the two side surfaces intersect, the boundary of each sub-layer film is welded and fixed to the sub-layer welding plate 71 or the sub-layer welding metal sheet 4 provided on the top plate material of the dihedral corner area planar transition sub-insulation module 70. Specifically, since the top of the dihedral corner area sub-insulation module 50 is designed with a metal welding plate 53 in the corner area where the two side surfaces intersect, the metal welding plate is disconnected between the dihedral corner area planar transition sub-insulation modules 70, and the gap is supported by a transition film structure on the corner area steel plate seam, and the side of the transition film structure is directly welded to the metal welding plate 53 of the adjacent corner area module. The two ends are overlapped and welded to the secondary film 32a on the dihedral corner area planar transition secondary insulation module. The contact between the secondary film 32a in the planar area and the adjacent metal welding plate 53 in the corner area is directly welded to the metal welding plate 53 to form a seal in the corner area.

[0087] After completing the installation of the secondary film 32a in the corner area where the two side surfaces intersect, the cap rod structure 11 of the upper portion of the through-fastener is installed. The cap rod structure 11 is connected to the threaded cut 3a of the metal connecting rod 3 and fastened. Then, the outer edge of the joint between the cap rod structure 11 and the secondary welding metal sheet 4 is welded and sealed to ensure the tightness of the position where the through-fastener passes through the secondary welding metal sheet 4.

[0088] After the cap rod structure 11 of the upper portion 25 of the through-fastener is installed, the main layer dihedral corner area thermal insulation module 60 of the main layer dihedral corner area is installed; after the main layer dihedral corner area thermal insulation module 50 and the adjacent other main layer dihedral corner area thermal insulation module 60 and the two main layer insulation layers 33 at the same corner are installed in place, the corresponding through-fastener pressing block 21 is installed at the corner. The pressing block 21 is installed on the middle plate 64 of the two adjacent main layer dihedral corner area thermal insulation modules and the two main layer insulation layers, and is connected to the cap rod structure 11 and locked;

[0089] Install the fastening card 35, which includes a straight card 35b and a cross card 35a. The middle position of the cross card and the middle position of the straight card are both provided with through holes 78 for installing through fasteners, and the through holes 78 are provided with a main layer welding metal sheet 24 with a center hole for sealing. The four long sides of the cross card and the two long sides of the straight card are fixed with main layer welding plates 38 for welding and fixing.

[0090] After the fastening card plate 35 is installed, the main layer film layer 34 is installed. A plurality of main layer films 34a with a first preset size are spliced ​​together by welding. The boundary of each main layer film 34a is welded to the main layer welding plate 38 or the main layer welding metal sheet 24 on the fastening card plate 35 provided on the main layer insulation layer.

[0091] The boundary of each sub-layer film 32a is welded and fixed to the sub-layer welding plate 71 or the sub-layer welding metal sheet 4 provided on the top plate of the dihedral angle area planar transition sub-insulation module, and the metal welding plate 53 provided on the dihedral angle area sub-insulation module, including:

[0092] The edge of the secondary film 32a adjacent to the dihedral angle area secondary insulation module facing the dihedral angle area secondary insulation module is welded to the metal welding plate 53, and the other edges of the secondary film 32a are welded to the secondary welding plate 71 or the secondary welding metal sheet 4 on the dihedral angle area planar transition secondary insulation module 70, and a thermal protection layer is laid at the position where the boundary of the secondary film does not contact the secondary welding plate 71 and the secondary welding metal sheet 4;

[0093] First, intermittent spot welding is performed on the position where the sub-layer film 32a contacts the sub-layer welding plate 71, the position where the sub-layer welding metal sheet 4 contacts, or the position where the sub-layer welding plate 53 contacts. After a whole piece of sub-layer film 32a is welded, the adjacent sub-layer film is overlapped on the previous sub-layer film, and the overlapping edges are continuously welded.

[0094] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A dihedral area arrangement structure of a membrane type enclosure system, characterized in that: The film-type containment system comprises a main film layer, a fastening card plate, a main insulating layer, a secondary film layer and a secondary insulating layer which are sequentially connected and fixed to the hull structure by penetrating fasteners, wherein the main film layer, the main insulating layer, the secondary film layer and the secondary insulating layer enclose a cryogenic liquid cargo storage tank for accommodating ultra-low temperature medium, and the main film layer is in contact with the ultra-low temperature medium; in the corner area where two side surfaces of the film-type containment system intersect, there are a main layer dihedral angle area and a secondary layer dihedral angle area, wherein: The main layer dihedral angle area includes a main layer dihedral angle area heat insulation module, and the main layer dihedral angle area heat insulation module includes a first top plate, an upper insulation block, a middle plate and a lower insulation block that are fixedly connected in sequence, wherein the first top plate is provided with a through-type stress release groove according to the structure covered thereon, the upper insulation block includes two rectangular insulation blocks arranged at a first angle, and the upper insulation block is provided with a non-through-type stress release groove arranged to be aligned with the through-type stress release groove arranged on the first top plate; The secondary dihedral area includes a dihedral area secondary insulation module bonded and fixed to the hull structure and a dihedral area plane transition secondary insulation module fixedly connected to the hull structure via a through fastener; The dihedral area secondary insulation module comprises a first bottom plate, a heat insulation block and a metal welding plate, wherein the first bottom plate is two pieces, and are respectively arranged parallel to the dihedral area structure of the hull and fixed on the hull structure; The dihedral angle area plane transition secondary insulation module includes a secondary layer welding metal sheet, a secondary layer welding plate, a second top plate, four insulation blocks, a cross reinforcement structure, a second bottom plate, a pressed sheet insulation block and a pressed plate plate. Four insulation blocks are arranged between the second top plate and the second bottom plate. The four insulation blocks are fixed in a space formed by the second top plate, the second bottom plate and the cross reinforcement structure. The cross reinforcement structure is provided with two central support structures. A through hole for installing a through fastener is provided in the middle of the central support structure. The second top plate and the second bottom plate are both provided with installation and fixing holes corresponding to the through holes on the central support structure.

2. The dihedral area arrangement structure of the membrane type enclosure system according to claim 1, characterized in that: In the main layer dihedral area thermal insulation module, the first top plate includes two rectangular plates arranged at a first angle, the first angle is determined according to the angle of the dihedral angle of the hull dihedral area structure, and the range of the first angle is 80 to 160 degrees, the rectangular area of ​​the upper insulation block is larger than the first top plate, the first top plate is located in the middle of the rectangle of the upper insulation block, the lower insulation block includes two rectangular insulation blocks arranged at the first angle, the middle plate is arranged between the upper insulation block and the lower Between the insulation blocks, the upper insulation block, the middle plate and the lower insulation block are provided with installation notches for installing through fasteners at the four vertices and the midpoints of the long sides, the middle plate is provided with fixed pads at the four vertices, the portion of the fixed pad in the lower insulation block is adapted to the shape of the installation notch on the lower insulation block, the fixed pad is fixedly connected to the lower insulation block, and the bottom of the lower insulation block is provided with a secondary protrusion structure for accommodating the secondary film according to the shape and arrangement of the secondary film in contact with it. Layer film adapter groove.

3. The dihedral area arrangement structure of the membrane type enclosure system according to claim 2, characterized in that: The heat-insulating block is arranged on a side of the first bottom plate away from the hull structure, the second angle between the two side surfaces of the heat-insulating block away from the first bottom plate is determined according to the angle of the dihedral angle of the dihedral angle zone structure of the hull, and the range of the second angle is 80-160°, the heat-insulating block is bonded and fixed to the first bottom plate, and the periphery of the heat-insulating block coincides with the periphery of the first bottom plate; The thermal insulation block is provided with a stepped notch groove parallel to the straight line intersecting the two side surfaces at the outer edges of the two side surfaces away from the first bottom plate; a spacing plunger hole for spacing installation of the secondary dihedral angle area is provided on a step plane in the stepped notch groove parallel to the side surface where the stepped notch groove is located; the thermal insulation block is provided with a metal welding plate for welding and fixing to the secondary film layer at other positions of the two side surfaces away from the first bottom plate; adjacent thermal insulation blocks are bonded and fixed.

4. The dihedral area arrangement structure of the membrane type enclosure system according to claim 3, characterized in that: In the dihedral angle area plane transition secondary insulation module, a welding plate groove and a welding sheet groove are provided on the top of the second top plate material, after the secondary layer welding plate and the secondary layer welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surface of the secondary layer welding plate and the upper surface of the secondary layer welding metal sheet are flush with the upper surface of the second top plate material, and the secondary layer welding metal sheet is provided with a connecting hole for installing a through fastener, and two insulation blocks at one end of the dihedral angle area plane transition secondary insulation module in contact with the dihedral angle area secondary insulation module are provided on the second top plate material. A mounting notch is formed on one side of the plate, the mounting notch is located close to the side of the dihedral angle area secondary insulation module and is arranged corresponding to the step notch. After the dihedral angle area planar transition secondary insulation module and the dihedral angle area secondary insulation module are fitted together, the pressing plate is bonded and fixed to the bottom of the step notch and the bottom of the mounting notch at the same time, the gap between the pressing sheet insulation block and the pressing plate and the side wall of the step notch is filled with low-density flexible insulation material, and the upper part of the pressing sheet insulation block is bonded and fixed to the second top plate.

5. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: When the secondary insulation module in the dihedral angle area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate, strips of epoxy resin are adhered between the first bottom plate and the side wall of the hull structure at a certain distance, and the height of the epoxy resin between the first bottom plate and the side wall of the hull structure is set to be greater than 12 mm and less than 20 mm according to the distance between the epoxy resins.

6. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The through fastener comprises: a through fastener upper section and a through fastener lower section, wherein: The upper section of the through fastener includes a cap rod structure, a clamping block, a double-headed screw and a metal sealing cap; wherein the clamping block is arranged in the installation notches opened on the upper insulation blocks of the two adjacent main layer dihedral area insulation modules and the upper insulation blocks of the two main layer insulation layers, the lower part of the clamping block is in contact with the fixed pad, and the double-headed screw is provided in the mounting notches opened on the upper insulation blocks of the two adjacent main layer dihedral area insulation modules and the upper insulation blocks of the two main layer insulation layers. The screw and the metal sealing cap lock the pressing block; The lower section of the through-fastener includes a cylindrical welding base and a metal connecting rod with threads at both ends, one end of which passes through the secondary welding metal sheet and is fixedly connected to the cap rod structure of the upper section of the through-fastener, and the other end is welded and fixed to the hull structure through the set cylindrical welding base. The metal connecting rod is inserted into the through hole of the central supporting structure of the dihedral angle area plane transition secondary insulation module.

7. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The first top plate, the middle plate, the second top plate, the cross reinforcement structure, the first bottom plate and the second bottom plate are all made of low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can withstand a temperature of at least minus 196 degrees Celsius, and the strength must meet the following requirements, specifically, Vertical compression strength is greater than or equal to 4Mpa, bending strength is greater than or equal to 20Mpa, horizontal tensile strength is greater than or equal to 25Mpa, vertical tensile strength is greater than or equal to 1.5Mpa, and shear strength is greater than or equal to 2.5Mpa; The upper insulation block, the lower insulation block, the heat-insulating block and the insulation block are all made of materials that meet set thermal conductivity requirements, wherein the set thermal conductivity requirements are that the thermal conductivity is not greater than 0.1 W / m·K.

8. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The main film layer of the secondary film layer is made of Invar steel or 304L stainless steel prefabricated into a set corrugated shape.

9. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The main layer films are formed by welding a plurality of main layer films having a first preset size.

10. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The connecting gaps between the dihedral corner area structure of the membrane type enclosure system and the dihedral corner area plane transition secondary insulation module and the main layer insulation module of the adjacent plane area are arranged in a staggered manner in a transverse "J"-shaped gap path.

11. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: Also includes: The distance plate is made of plywood or a plastic substitute material that meets the rigidity requirements, and the thickness is set to at least one of 1mm, 2mm, 5mm or 10mm. The distance plate is used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom of the dihedral angle area plane transition secondary insulation module and the dihedral angle area secondary insulation module and the bulkhead is 10mm; The diameter of the through hole on the distance plate is 0.5-2 mm larger than the outer diameter of the thread on the stud.

12. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The cross reinforcement structure, except for the pressure plate, overlaps with the second top plate at the periphery of the rest of the structure, and is connected to the second top plate by glue or rivets; The second bottom plate, except for the pressure plate, has its periphery overlapped with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets; The heat-insulating block overlaps with the second top plate, the second bottom plate and the periphery of the cross reinforcement structure; The contact points between the heat-insulating block, the second top plate, the second bottom plate and the cross reinforcement structure are all connected and fixed by glue.

13. The dihedral area arrangement structure of the membrane type enclosure system according to claim 4, characterized in that: The pressing plate is located at the bottom of the groove formed by the butt joint of the step notch groove and the installation notch groove, and is bonded and fixed to the adjacent insulation block by glue, and the pressing plate extends out of the second bottom plate near the dihedral angle area of ​​the secondary layer; The sheeting insulation block is located between the second top plate and the pressing plate; The contact points between the pressing plate heat-insulating block and the second top plate, and between the pressing plate and the heat-insulating block are fixedly connected by glue; The contact points between the fixed pad block and the lower insulation block are connected and fixed by glue.

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