Installation method of two-side corner region arrangement structure of thin film type enclosure system

Abstract

The embodiment of the present application provides a kind of installation method of two-side angle area arrangement structure of thin film type containment system, and thin film type containment system includes main layer film layer, fastening card, main layer insulation layer, secondary layer film layer and secondary layer insulation layer connected and fixed to ship structure in sequence by penetrating fastener, and main layer film layer, main layer insulation layer, secondary layer film layer and secondary layer insulation layer are enclosed to form a low-temperature liquid cargo storage tank for accommodating ultra-low temperature medium, and main layer film layer is in contact with ultra-low temperature medium;In the angle area of two sides intersection in thin film type containment system, including main layer two-side angle area and secondary layer two-side angle area, installation method includes: installing distance plate on the bulkhead of ship structure according to setting line, and the stud of distance plate of two-side angle area plane transition secondary insulation module and two-side angle area secondary insulation module for positioning secondary layer two-side angle area, and then installing two-side angle area plane transition secondary insulation module and two-side angle area secondary insulation module and other modules.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for transporting and storing cryogenic liquids, and in particular to an installation method for a two-sided corner arrangement structure of a membrane-type enclosure system. Background Technology

[0002] When transporting gases such as natural gas and ethane, liquefaction is typically achieved by cooling the gases to cryogenic temperatures for more economical long-distance transport. Liquefaction significantly reduces the gas volume, lowering transportation costs. The liquefied cryogenic liquid is stored and transported in specialized cryogenic cargo tanks.

[0003] In the current shipbuilding industry, cryogenic liquid cargo containment systems are mainly involved in the construction of LNG ships. For LNG ships, the International Code for the Construction and Equipment of Liquefied Gas Ships (IGC Code) defines four categories of containment systems: Type A, Type B, Type C, and membrane containment systems. Among them, membrane containment systems are widely used due to their advantages such as high cargo space utilization, good insulation performance, and small area exposed to wind resistance.

[0004] Existing membrane-type containment systems mainly include the Mark III and NO 96 types, both originating from the French company GTT. However, both systems have their own shortcomings. For the NO 96 type, because its primary and secondary corner insulation modules are arranged in an overlapping manner, the gaps between the thermal insulation modules in the primary corner areas and the gaps between the secondary insulation modules in the corner areas directly connect to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, there is still significant heat leakage at the gaps. For the Mark III type, because the thermal insulation modules in the primary corner areas, the secondary insulation modules in the corner areas, and the secondary membrane layer are all fixed together with adhesive and then fixed to the hull structure with epoxy resin, the relative movement between the primary and secondary insulation modules in the corner areas is restricted, resulting in poor overall resistance to hull movement and liquid cargo sloshing. In addition, the extensive use of adhesives leads to a long construction period, and the strict requirements for the construction environment (humidity and temperature) and procedures delay the delivery of the entire vessel. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the present invention provides an installation method for a two-sided corner area arrangement structure of a membrane-type enclosure system. The membrane-type enclosure system is used to contain cryogenic media and includes a main membrane layer, a fastening plate, a main insulating layer, a secondary membrane layer, and a secondary insulating layer sequentially connected and fixed to the hull structure (hull steel plate) by through fasteners. That is, a main insulating layer and a fastening plate are set between the main membrane layer and the secondary membrane layer, and a secondary insulating layer is set between the secondary membrane layer and the hull structure. The main membrane layer, fastening plate, main insulating layer, secondary membrane layer, and secondary insulating layer are all connected and fixed to the hull structure by through fasteners. At the same time, the main insulating structure and gaps between the main membrane layer and the secondary membrane layer form a main shielding space, and the secondary insulating structure and gaps between the secondary membrane layer and the hull structure form a secondary shielding space, effectively building a double-sealed cryogenic media storage carrier and solving the problems of cryogenic media storage and leakage prevention.

[0006] This invention provides an installation method for a bifacial corner area arrangement structure of a membrane-type enclosure system. The membrane-type enclosure system includes a main membrane layer, a fastening plate, a main insulating layer, a secondary membrane layer, and a secondary insulating layer, which are sequentially connected and fixed to the hull structure via through fasteners. The main membrane layer, the main insulating layer, the secondary membrane layer, and the secondary insulating layer enclose and form a cryogenic liquid cargo storage tank for containing cryogenic media. The main membrane layer is in contact with the cryogenic media. The corner area where the two sides of the membrane-type enclosure system intersect includes a main bifacial corner area and a secondary bifacial corner area. The installation method includes:

[0007] Install spacers and studs on the bulkheads of the hull structure according to the set lines to position the secondary dihedral area plane transition sub-insulation module and the spacers on the dihedral area sub-insulation module of the secondary dihedral area.

[0008] The two-sided corner area planar transition secondary insulation module and the two-sided corner area secondary insulation module are respectively installed onto the spacer plate by through fasteners. The studs passing through the spacer plate extend into the spacer plug holes opened on the bottom of the insulation block and the mounting notch of the two-sided corner area planar transition secondary insulation module, or extend into the spacer plug holes opened on the bottom of the stepped notch of the two-sided corner area secondary insulation module.

[0009] After the two-sided corner area plane transition secondary insulation module and the two-sided corner area secondary insulation module are installed, the secondary film layer is installed. The secondary film layer includes multiple secondary films with preset sizes connected by splicing. In the corner area where the two sides intersect, the boundary of each secondary film is welded and fixed to the secondary welding plate or secondary welding metal sheet of the second top plate of the two-sided corner area plane transition secondary insulation module.

[0010] After completing the installation of the secondary film layer in the corner area where the two sides intersect, the thermal insulation modules of the two corner areas of the main layer are installed. Each thermal insulation module of the two corner areas of the main layer is pressed and connected to the upper part of four through fasteners. The four through fasteners on the same thermal insulation module of the two corner areas of the main layer are respectively located at the four corners of the module. In the same corner area, after one thermal insulation module of the two corner areas of the main layer is installed in place with another adjacent thermal insulation module of the two corner areas of the main layer and two main insulation modules, the corresponding through fastener clamping block is installed in the corner area. The lower end of the installed clamping block presses on the middle plate of the two adjacent thermal insulation modules of the two corner areas of the main layer and two main insulation modules, and the installed clamping block is fixedly connected and locked to the upper end of the cap rod structure of the corresponding through fastener.

[0011] The fastening plate includes a cross plate and a straight plate. The cross plate and the straight plate are provided with slots for installing the main layer welding metal sheet and through holes for installing through fasteners. The main layer welding metal sheet has a central hole. The four long strips of the cross plate and the two long strips of the straight plate are fixed with main layer welding plates for welding and fixing to the main layer film.

[0012] After the fastening plate is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films with preset dimensions connected by splicing. The boundary of each main layer film is welded and fixed to the main layer welding plate or main layer welding metal sheet on the fastening plate on the main layer insulation module.

[0013] In some embodiments of the present invention, before installing the spacer plate on the bulkhead of the hull structure according to the set markings, the method further includes:

[0014] Lines are drawn on the bulkhead of the hull structure, and welding bases for the lower part of the through fasteners are welded on the bulkhead at the positions where through fasteners are placed, according to the lines. Nuts are pre-placed inside the welding bases before welding.

[0015] A metal connecting rod is installed in connection with a through fastener fixed to the welding base, and a spacer plate is installed on the stud.

[0016] In some embodiments of the present invention, the dihedral corner area secondary insulation module includes a first bottom plate, a heat insulation block and a metal welding plate. The second included angle between the two sides of the heat insulation block away from the first bottom plate is determined according to the angle of the dihedral corner of the hull dihedral area structure, and the range of the second included angle is 80 to 160°. The dihedral corner area secondary insulation module is bonded and fixed to the bulkhead of the hull structure through the first bottom plate. The heat insulation block has a stepped notch groove at the outer edge of the two sides away from the first bottom plate, which is parallel to the straight line at the intersection of the two sides.

[0017] The secondary corner transition module includes a second top plate, four insulation blocks, a cross-shaped reinforcing structure, and a second bottom plate. The four insulation blocks are fixed within the space formed by the second top plate, the second bottom plate, and the cross-shaped reinforcing structure. The cross-shaped reinforcing structure has two central support structures, each with a through hole for installing a through fastener. At the end of the secondary corner transition module that contacts the secondary corner insulation module, two insulation blocks have mounting notches on one side of the second top plate. The mounting notches are located near the secondary corner insulation module and have spaced plunger holes.

[0018] In some embodiments of the present invention, the metal connecting rod of the through fastener passes through the through hole of the central support structure on the cross-shaped reinforcing structure of the two-sided corner area plane transition secondary insulation module, and the cap rod structure of the upper part of the through fastener is screwed and fixed to the metal connecting rod and welded to the secondary welding metal sheet embedded in the second top plate.

[0019] In some embodiments of the present invention, when the secondary insulation module in the two-sided corner area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate, strip-shaped epoxy resin is adhered between the first bottom plate and the side wall of the hull structure at a certain interval. 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 spacing between the epoxy resins.

[0020] In some embodiments of the present invention, a fixed-distance plunger hole 54 and a fixed-distance bolt hole 55 for fixed-distance installation in the two-sided corner area of ​​the secondary layer are provided on the stepped plane parallel to the side where the stepped notch is located. The heat insulation block is provided with metal welding plates for welding and fixing to the secondary film layer at other positions on the two sides away from the first bottom plate.

[0021] In some embodiments of the present invention, the two-sided corner area planar transition secondary insulation module further includes a pressure sheet insulation block and a pressure sheet plate. The top of the second top plate is provided with a welding plate groove and a welding sheet groove. After a secondary welding plate and a secondary welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surfaces of the secondary welding plate and the secondary welding metal sheet are flush with the upper surface of the second top plate. The secondary welding metal sheet is provided with connecting holes for installing through fasteners. Both the second top plate and the second bottom plate are provided with connections to the cross-shaped reinforcing structure. The central support structure has through holes corresponding to mounting holes. The mounting notch is corresponding to the stepped notch. After the two-sided corner area plane transition secondary insulation module is attached to the two-sided corner area secondary insulation module, the bottom of the stepped notch and the bottom of the mounting notch are bonded and fixed. The pressing insulation block is bonded and fixed to the pressing plate, the side wall of the stepped notch and the side wall of the mounting notch. The upper part of the pressing insulation block is bonded and fixed to the second top plate. One two-sided corner area secondary insulation module corresponds to two two-sided corner area plane transition secondary insulation modules.

[0022] In some embodiments of the present invention, the step of welding and fixing the boundary of each secondary film to the secondary welding plate or secondary welding metal sheet of the second top plate of the secondary insulating module located in the bifacial corner transition area includes:

[0023] The edge of the secondary film adjacent to the secondary insulation module of the bifacial corner area facing the secondary insulation module is welded to the metal welding plate, and the other edges of the secondary film are welded and fixed to the secondary welding plate or secondary welding metal sheet of the secondary insulation module of the bifacial corner area plane transition. A heat protection layer is laid at the position where the boundary of the secondary film does not contact the secondary welding plate and the secondary welding metal sheet.

[0024] First, intermittent spot welding is performed on the positions where the secondary film contacts the secondary welding plate, the secondary welding metal sheet, or the metal welding plate. After a whole piece of secondary film is welded, the adjacent secondary films are overlapped on the previous secondary film, and the overlapping edges are continuously welded.

[0025] In some embodiments of the present invention, the spacer 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 spacer plate is used for leveling. By using spacer plates of different thicknesses to stack and combine, the distance between the bottom of the two-sided corner area plane transition secondary insulation module and the two-sided corner area secondary insulation module and the bulkhead is 10mm.

[0026] The diameter of the through hole on the spacer plate is 0.5-2 mm larger than the outer diameter of the thread on the metal connecting rod.

[0027] In some embodiments of the present invention, the through-fastener includes: an upper portion of the through-fastener and a lower portion of the through-fastener, wherein,

[0028] The upper part of the through fastener includes a cap rod structure, a clamping block, a double-ended screw, and a metal sealing cap. The clamping block is located in the installation notch opened on the upper insulation block of the two adjacent main layer corner insulation modules and the upper insulation block of the two main layer insulation layer modules. The lower part of the clamping block is in contact with the fixing pad, and the long bolt on the clamping block locks the clamping block.

[0029] The lower section includes a cylindrical welded base and a metal connecting rod with threads at both ends. One end of the rod passes through the secondary welded metal sheet and is fixedly connected to the cap rod structure. The other end is welded and fixed to the hull structure through the cylindrical welded base. The metal connecting rod passes through the through hole of the central support structure on the cross-shaped reinforcing structure of the two-sided corner area plane transition secondary insulation module.

[0030] In some embodiments of the present invention, the main layer dihedral corner 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. The first top plate includes two rectangular plates arranged at a first included angle. The first included angle is determined according to the angle of the dihedral corners of the hull structure, and the range of the first included angle is 80° to 160°. The first top plate is provided with a through-type stress relief groove according to the structure of the main layer film covering it. The upper insulation block includes two rectangular insulation blocks arranged at the first included angle. The upper insulation block is provided with a non-through-type stress relief groove aligned with the through-type stress relief groove on the first top plate. The rectangular area of ​​the upper insulation block is larger than that of the first top plate. The first top plate is located in the middle of the rectangular upper insulation block. The lower insulation block includes two rectangular insulation blocks arranged at a first included angle. The middle plate is located between the upper insulation block and the lower insulation block. Each of the four vertices of the upper insulation block, the middle plate, and the lower insulation block has an installation notch for installing a through fastener. The middle plate has a fixing pad at each of the four vertices. The portion of the fixing pad in the lower insulation block is adapted to the shape of the installation notch on the lower insulation block. The fixing pad is fixedly connected to the lower insulation block. The bottom of the lower insulation block has an adapter groove for accommodating the protrusions on the sub-film layer according to the shape and arrangement of the sub-film layer it contacts.

[0031] In some embodiments of the present invention, the first top plate, the middle plate, the second top plate, the cross-shaped reinforcing 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. The low-temperature resistant non-metallic material must be able to withstand a temperature of at least -196 degrees Celsius, and its strength must meet the following requirements: specifically,

[0032] Vertical compressive strength ≥ 4 MPa, flexural strength ≥ 20 MPa, horizontal tensile strength ≥ 25 MPa, vertical tensile strength ≥ 1.5 MPa, and shear strength ≥ 2.5 MPa.

[0033] The upper insulation block, the lower insulation block, the thermal insulation 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;

[0034] The secondary film is made of Invar steel, 304L stainless steel, or other low-temperature resistant metal materials pre-formed with a set corrugated shape.

[0035] In some embodiments of the present invention, the cross-shaped reinforcing structure, except for the pressure plate, overlaps with the second top plate on its periphery and is connected to the second top plate by glue or rivets.

[0036] The second bottom plate, except for the pressure plate, overlaps with the cross-shaped reinforcing structure and the second top plate on its periphery, and is connected to the cross-shaped reinforcing structure by glue or rivets;

[0037] The insulation block overlaps with the periphery of the second top plate, the second bottom plate, and the cross-shaped reinforcing structure;

[0038] The insulation block is connected and fixed with glue at the contact points with the second top plate, the second bottom plate and the cross-shaped reinforcing structure;

[0039] The stepped notch and the mounting notch are fixed together by adhesive.

[0040] The heat-insulating block is located between the second top plate and the heat-insulating plate;

[0041] The heat-insulating block is fixedly connected to the second top plate, the heat-insulating plate, and the heat-insulating block at their contact points by adhesive.

[0042] Compared with the prior art, the beneficial effects of the two-sided corner structure of the film-type enclosure system provided in this embodiment of the invention are as follows: the main insulation layer module and the secondary insulation layer module of the two-sided corner are arranged in an alternating manner, which reduces the overall heat leakage at the gaps; at the same time, the secondary insulation layer module of the two-sided corner is bonded to the hull structure with epoxy resin, and the main insulation layer module of the two-sided corner is connected by through fasteners. Since the through fasteners have elastic clamping blocks, the main insulation layer module and the secondary insulation layer module of the two-sided corner have relative movement tolerance, and the stability and low-temperature deformation absorption capacity are stronger. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the trihedral corner area structure arrangement of the membrane enclosure system in the installation method of the bihedral corner area arrangement structure of the membrane enclosure system provided in the embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the arrangement of the two-sided corner area structure of the membrane enclosure system in the installation method of the membrane enclosure system provided in the embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the arrangement of insulating modules in the two-sided corner area of ​​the membrane enclosure system in the installation method of the membrane enclosure system arrangement structure provided in the embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the arrangement of the insulating modules in the two-sided corner area of ​​the installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the insulating module structure in the two-sided corner area of ​​the installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention;

[0048] Figure 6 This is an exploded view of the main layer two-sided corner insulation module structure in the installation method of the two-sided corner arrangement structure of the membrane enclosure system provided in the embodiment of the present invention;

[0049] Figure 7 This is an exploded view of the through-fasteners in the installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the two-sided corner secondary plane transition module structure in the installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention;

[0051] Figure 9 An exploded view of the bifacial corner secondary plane transition module structure in the installation method of the bifacial corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention.

[0052] Figure Labels

[0053] 1. Welded base; 2. Nut; 3. Metal connecting rod; 3a. Threaded bevel; 4. Secondary welded metal sheet; 10. Lower section of through-fastener; 11. Cap rod structure; 19. Long bolt; 21. Clamping block; 22. Double-ended screw; 23. Metal sealing cap; 24. Main welded metal sheet; 25. Upper section of through-fastener; 26. First included angle; 27. Second included angle; 28. Through-fastener; 29. ​​Epoxy resin; 31. 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, Spacing plate; 37, Stud; 38, Main welding plate; 39, Low-density flexible insulation material; 40, Gap path; 41, Plunger; 50, Secondary insulation module in the bifacial corner area; 50a, 90° bifacial corner area secondary insulation module; 50b, 135° bifacial corner area secondary insulation module. Insulation module; 51. First bottom plate; 52. Thermal insulation block; 53. Metal welded plate; 54. Spacing plunger hole; 55. Spacing bolt hole; 56. Stepped notch groove; 57. Main layer two-sided corner area; 58. Secondary layer two-sided corner area; 60. Thermal insulation module for the main layer two-sided corner area; 60a. 90° thermal insulation module for the main layer two-sided corner area; 60b. 135° thermal insulation module for the main layer two-sided corner area; 61. Upper insulation block; 62. Lower insulation block; 63. First top plate; 64. Middle section 65. Plate; 66. Fixing pad; 67. Through-type stress relief groove; 68. Non-through-type stress relief groove; 69. Adaptor groove; 70. Notch; 71. Two-sided corner area plane transition secondary insulation module; 72. Secondary welding 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. Central support structure; 80. Secondary bottom plate; 81. Pressed sheet plate; 82. Installation notch groove. Detailed Implementation

[0054] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0056] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0057] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0058] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0059] Specific embodiments of this application are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to ascertain the true intent based on the user's historical operations, and to avoid unnecessary or redundant details that would obscure this application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in various ways with substantially any suitable detailed structure.

[0060] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0061] This invention provides an installation method for a two-sided corner area arrangement structure of a membrane-type enclosure system, such as... Figures 1 to 9 As shown, the membrane enclosure system is used to contain cryogenic media and includes a main membrane layer 34, a fastening plate 35, a main insulation layer 33, a secondary membrane layer 32, and a secondary insulation layer 31, which are sequentially connected and fixed to the hull structure (hull steel plate) by through fasteners 28. Specifically, the main insulation layer 33 and the fastening plate 35 are disposed between the main membrane layer 34 and the secondary membrane layer 32, and the secondary insulation layer 31 is disposed between the secondary membrane layer 32 and the hull structure; the main membrane layer... 34. The fastening plate 35, the main insulating layer 33, the secondary thin film layer 32, and the secondary insulating layer 31 are all connected and fixed to the hull structure by through fasteners 28. Simultaneously, the main insulating structure and gaps between the main thin film layer 34 and the secondary thin film layer 32 form a main shielding space, and the secondary insulating structure and gaps between the secondary thin film layer 32 and the hull structure form a secondary shielding space. This effectively constructs a double-sealed cryogenic medium storage carrier, solving the problems of cryogenic medium storage and leakage prevention. Specifically,

[0062] Regarding the installation method for the aforementioned dihedral corner arrangement structure of the membrane-type enclosure system, the corner area where the two sides of the membrane-type enclosure system intersect includes a primary layer dihedral corner area 57 and a secondary layer dihedral corner area 58. The installation method includes:

[0063] Marking lines on the bulkhead of the hull structure, and welding base 1 for the lower section 10 of the through fastener 28, and studs 37 for positioning the bifacial corner transition sub-insulation module 70 and the spacer plate 36 of the bifacial corner sub-insulation module 50 of the secondary bifacial corner area 58, are welded on the bulkhead according to the marking lines. Before welding, the adapter nut 2 is placed inside the welding base 1, and the metal connecting rod 3 of the through fastener 28, which is fixedly connected to the welding base 1, is installed on the stud 37. Mounting spacer plate 36; wherein, four through holes are symmetrically arranged at the four corners of the spacer plate 36 about the center line of the spacer plate 36, and a stud 37 is inserted in each through hole; wherein, the through fastener includes an upper part 25 and a lower part 10, the lower part 10 includes a cylindrical welded base 1 and a metal connecting rod 3 with threads at both ends, the upper part 25 includes a cap rod structure 11, a clamping block 21, a double-ended screw 22 and a metal sealing cap 23. The bifacial corner secondary insulation module 50 includes a 90° bifacial corner secondary insulation module 50a and a 135° bifacial corner secondary insulation module 50b.

[0064] The studs 37 passing through the spacer plate 35 extend into the spacer plug holes 54 opened on the bottom of the insulation block 76 and the mounting notch 82 of the dihedral corner secondary insulation module 70, or into the spacer plug holes 54 opened on the bottom of the stepped notch 56 of the dihedral corner secondary insulation module. Specifically, one dihedral corner secondary insulation module 50 is equipped with one or two dihedral corner secondary insulation modules 70 connected thereto. At the same time, four spacer plug holes 54 are opened on the bottom of the stepped notch 56 of the dihedral corner secondary insulation module 50. One fixed-distance plunger hole 54 is provided at each end of the bottom of the mounting notch 82 of the secondary insulation module 70 in the dihedral area plane transition. The dihedral area secondary insulation module includes a first bottom plate 51, a heat insulation block 52, and a metal welded plate 53. The second included angle 27 between the two sides of the heat insulation block 52 away from the first bottom plate 51 is determined according to the angle of the dihedral angle of the dihedral area structure of the hull, and the range of the second included angle 27 is 80° to 160°. The block is bonded and fixed to the bulkhead of the hull structure by the first bottom plate 51. The heat insulation block 52 has stepped notch grooves 56 arranged parallel to the straight lines at the intersection of the two sides at the outer edges of the two sides away from the first bottom plate 51. The two-sided corner area plane transition secondary insulation module 70 includes a second top plate 72, four insulation blocks 76, a cross reinforcement structure 77 and a 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 has two central support structures 79. The central support structure 79 has a through hole 78 for installing a through fastener 28 in the middle. The two insulation blocks 76 at the end of the two-sided corner area plane transition secondary insulation module 70 that are in contact with the two-sided corner area secondary insulation module have installation notch grooves 82 formed on one side of the top plate. The installation notch groove is located on the side close to the two-sided corner area secondary insulation module. The installation notch groove has a fixed-distance plunger hole 54.

[0065] Specifically, when the secondary insulation module in the two-sided corner area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate 51, strip-shaped epoxy resin 29 is adhered between the first bottom plate 51 and the side wall of the hull structure at a certain interval. The height of the epoxy resin 29 between the first bottom plate 51 and the side wall of the hull structure is set to be greater than 12mm and less than 20mm according to the spacing between the epoxy resin 29.

[0066] Furthermore, both the first bottom plate 51 and the second bottom plate 80 are respectively provided with openings concentrically arranged with the through holes, and the second top plate 72, the heat insulation block 52, and the heat insulation block 76 are provided with spacer plunger holes 54 concentrically arranged with the corresponding through holes and with a diameter 2-4 times the diameter of the corresponding through holes, thereby facilitating the locking of the spacer plate 36 by gaskets, fastening nuts, and tooling. Furthermore, after the four studs 37 passing through each spacer plate 36 are locked with nuts 2, plungers 41 of the same material as the heat insulation block 76 are used to fill the spacer plunger holes 54 on each dihedral corner secondary insulation module 50 and dihedral corner plane transition secondary insulation module 70, so as to achieve the interconnection effect between each dihedral corner secondary insulation module 50 and dihedral corner plane transition secondary insulation module 70, and to provide auxiliary anchoring for both dihedral corner secondary insulation modules 50 and dihedral corner plane transition secondary insulation modules 70.

[0067] The spacer plate 36 is made of plywood or a plastic alternative material that meets the rigidity requirements, with a thickness of at least one of 1mm, 2mm, 5mm, or 10mm. The spacer plate 36 is used for leveling. By stacking and combining spacer plates 36 of different thicknesses, the distance between the bottom of the two-sided corner plane transition secondary insulation module 70 and the two-sided corner secondary insulation module 50 and the bulkhead is 10mm. The diameter of the through hole on the spacer plate 36 is 0.5-2mm larger than the outer diameter of the thread on the metal connecting rod 3.

[0068] After installing the two-sided corner area secondary insulation module 50 and the two-sided corner area planar transition secondary insulation module 70 onto the spacer plate 36, the through fastener 28 is installed. The metal connecting rod 3 of the through fastener 28 is inserted into the through hole 78 of the central support structure 79 on the cross reinforcement structure 77 of the two-sided corner area planar transition secondary insulation module 70. The cap rod structure 11 of the upper part 25 of the through fastener is tightened and fixed to the upper threaded cut end 3a of the metal connecting rod 3 and welded to the secondary welded metal sheet 4 embedded in the second top plate 72. At the same time, the use of the spacer plate 36, epoxy resin 29 and the lower part 10 of the through fastener can effectively anchor the two-sided corner area secondary insulation module 50 and the two-sided corner area planar transition secondary insulation module 70 of the entire enclosure system to the hull bulkhead.

[0069] After the secondary corner transition module 70 and the secondary corner insulation module 50 are installed, the secondary film 32a is installed. The secondary film a is made of Invar steel, 304L stainless steel, or other low-temperature resistant metal material with a pre-made corrugated shape. The secondary film layer 32 includes multiple secondary films 32a with preset dimensions connected by splicing. In the corner area where the two sides intersect, the boundary of each secondary film 32a is welded and fixed to the secondary welding plate 71 or secondary welding metal sheet 4 of the second top plate 72 of the secondary corner transition secondary insulation module 70. Specifically, in the corner area where the two sides intersect, the top of the two-sided corner secondary insulation module 50 adopts a metal welding plate 53 design. The metal welding plate 53 is broken between the two-sided corner plane transition secondary insulation modules 70. The gap is supported by a transition film structure on the corner steel plate seam. The side of the transition film structure is directly welded to the steel plate of the adjacent corner module. The two ends overlap and are welded to the secondary film 32a on the two-sided corner plane transition secondary insulation module 70. The secondary film layer 32a in the plane area is directly welded to the metal welding plate 53 where it contacts the adjacent metal welding plate 53 in the corner area, forming a seal in the corner area.

[0070] After the installation of the secondary film 32a in the corner area where the two sides intersect is completed, the main layer two-sided corner area insulation module 60 is installed. Each main layer two-sided corner area insulation module is pressed and connected to the upper part 25 of four through fasteners. The four through fasteners 28 are respectively located at the four corners of the main layer two-sided corner area insulation module. After the main layer two-sided corner area insulation module 60 at the same corner is installed in place with the other adjacent main layer two-sided corner area insulation module 60 and two main layer insulation modules 33a, the corresponding through fastener 28 clamping block 21 is installed at the corner. The clamping block 21 presses on the middle plate 64 of the two adjacent main layer two-sided corner area insulation modules 60 and the two main layer insulation modules 33a. The clamping block 21 is fixedly connected to and locked to the upper end of the cap rod structure 11.

[0071] The fastening plate 35 includes a cross plate 35a and a straight plate 35b. The middle positions of the cross plate 35a and the straight plate 35b are provided with grooves for installing the main layer welding metal sheet 24 and through holes for installing the through fastener 28. The main layer welding metal sheet 24 has a central hole. The four long strips of the cross plate 35a and the two long strips of the straight plate 35b are all fixed with main layer welding plates 38 for welding and fixing to the main layer film 34a.

[0072] After the fastening plate 35 is installed, the main layer film layer 34 is installed. The main layer film layer 34 is formed by welding multiple main layer films 34a with a first preset size. The boundary of each main layer film 34a is welded and fixed to the main layer welding plate 38 or the main layer welding metal sheet 24 on the fastening plate 35 on the main layer insulation module 33a.

[0073] In some embodiments of the present invention, a fixed-distance plunger hole 54 and a fixed-distance bolt hole 55 for fixed-distance installation in the two-sided corner area of ​​the secondary layer are provided on the stepped plane parallel to the side where the stepped notch is located. The heat insulation block 52 is provided with a metal welding plate 53 for welding and fixing to the secondary film layer 32 at other positions on the two sides away from the first bottom plate 51.

[0074] Further, in this embodiment, the two-sided corner area planar transition secondary insulation module 70 also includes a secondary welding metal sheet 4, a secondary welding plate 71, a pressing insulation block 75, and a pressing plate 81. The top of the second top plate 72 is provided with a welding plate groove 74 and a welding sheet groove 73. After the secondary welding plate 71 and the secondary welding metal sheet 4 are respectively installed in the welding plate groove and the welding sheet groove, the upper surfaces of the secondary welding plate 71 and the secondary welding metal sheet 4 are flush with the upper surface of the second top plate 72. The secondary welding metal sheet 4 is provided with a connecting hole for installing a through fastener. Both the second top plate 72 and the second bottom plate 80 are provided with through holes 78 that correspond to the central support structure 79 on the cross-shaped reinforcing structure 77. The mounting and fixing holes should be provided, and the mounting notch 82 is correspondingly provided with the stepped notch 56. After the two-sided corner area plane transition secondary insulation module 70 and the two-sided corner area secondary insulation module 52 are attached and set, the bottom of the stepped notch 56 and the bottom of the mounting notch 82 are bonded and fixed. The pressing sheet insulation block 75 is bonded and fixed with the pressing plate 81, the side wall of the stepped notch 56 and the side wall of the mounting notch 82. The gap between the side wall of the stepped notch 56 and the side wall of the mounting notch 82 is filled with low-density flexible insulation material. The upper part of the pressing sheet insulation block 75 is bonded and fixed with the second top plate 72, and one two-sided corner area secondary insulation module 52 is simultaneously provided with two two-sided corner area plane transition secondary insulation modules 70.

[0075] The step of welding and fixing the boundary of each secondary film layer 32 to the secondary welding plate 71 or secondary welding metal sheet 4 provided on the second top plate 72, and the metal welding plate 53 provided on the secondary insulation module 52 in the two corner areas, includes:

[0076] The edge of the secondary film 32a adjacent to the secondary insulation module 52 of the bifacial corner area facing the secondary insulation module 52 is welded to the metal welding plate 53, and the other edges of the secondary film 32a are welded and fixed to the secondary welding plate 71 or the secondary welding metal sheet 4 of the secondary insulation module 70 of the bifacial corner area plane transition. A heat protection layer is laid at the position where the boundary of the secondary film 32a does not contact the secondary welding plate 71 and the secondary welding metal sheet 4.

[0077] First, intermittent spot welding is performed on the positions where the secondary film 32a contacts the secondary welding plate 71, the secondary welding metal sheet 4, or the metal welding plate 53. After a whole piece of secondary film 32a is welded, the adjacent secondary film 32a is overlapped on the previous secondary film 32a, and the overlapping edge is continuously welded.

[0078] Furthermore, in this embodiment, the upper section 25 of the through fastener includes a cap rod structure 11, a clamping block 21, a double-ended screw 22, and a metal sealing cap 23. The clamping block 21 of the upper section 25 is disposed in the installation notch 69 opened on the upper insulation block 61 of the two adjacent main layer corner insulation modules 60 and the upper insulation block 61 of the two main layer insulation modules 33a. The lower part of the clamping block 21 is in contact with the fixing pad 65, and the long bolt 19 on the clamping block 21 of the upper section 25 locks the clamping block 21.

[0079] One end of the lower metal connecting rod 3 of the lower section 10 passes through the secondary welded metal sheet 4 and is fixedly connected to the cap rod structure 11. The other end is welded and fixed to the hull structure through the cylindrical welded base 1. The metal connecting rod 3 passes through the through hole 78 of the central support structure on the cross reinforcement structure 77 of the two-sided corner area plane transition secondary insulation module 70.

[0080] In some embodiments of the present invention, the main layer dihedral corner insulation module 60 includes a 90° main layer dihedral corner insulation module 60a and a 135° main layer dihedral corner insulation module 60b. Each main layer dihedral corner insulation module includes a first top plate 63, an upper insulation block 61, a middle plate 64, and a lower insulation block 62, which are sequentially fixedly connected. The first top plate 63 includes two rectangular plates arranged at a first included angle 26. The first included angle 26 is determined according to the angle of the dihedral corners of the hull structure, and the range of the first included angle 26 is 80°–160°. The first top plate 63 is provided with a through-type stress relief groove 66 according to the structure of the main layer film 34a covering it. The upper insulation block 61 includes two rectangular insulation blocks arranged at the first included angle 26. The upper insulation block 61 is provided with a non-through-type stress relief groove aligned with the through-type stress relief groove 66 on the first top plate 63. 67. The upper insulation block 61 has a rectangular area larger than the first top plate 63. The first top plate 63 is located in the middle of the upper insulation block 61. The lower insulation block 62 includes two rectangular insulation blocks arranged at a first included angle 26. The middle plate 64 is located between the upper insulation block 61 and the lower insulation block 62. The four vertices of the upper insulation block 61, the middle plate 64, and the lower insulation block 62 are provided with through-fastening devices for installation. The installation notch 69 of component 28, the middle plate 64 is provided with fixing pads 65 at the four vertices, the part of the fixing pad 65 in the lower insulation block 62 is adapted to the shape of the installation notch 69 on the lower insulation block 62, the fixing pad 65 is fixedly connected to the lower insulation block 62, and the bottom of the lower insulation block 62 is provided with an adapter groove 68 for accommodating the protruding structure on the sub-film layer 32a according to the shape and arrangement of the sub-film layer 32a in contact with it.

[0081] In some embodiments of the present invention, the first top plate 63, the middle plate 64, the second top plate 72, the cross-shaped reinforcing 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. The low-temperature resistant non-metallic material must be able to withstand a temperature of at least -196 degrees Celsius, and its strength must meet the following requirements: specifically,

[0082] Vertical compressive strength ≥ 4 MPa, flexural strength ≥ 20 MPa, horizontal tensile strength ≥ 25 MPa, vertical tensile strength ≥ 1.5 MPa, and shear strength ≥ 2.5 MPa.

[0083] The upper insulation block 61, the lower insulation block 62, the thermal insulation block 52, and the insulation block 76 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.

[0084] The secondary film 32a is made of Invar steel, 304L stainless steel or other low-temperature resistant metal material prefabricated with a set corrugated shape.

[0085] In some embodiments of the present invention, the connection gaps between the two-sided corner area structure of the film-type enclosure system and the secondary insulation module 70 of the two-sided corner area planar transition and the main layer insulation module 33a of the adjacent planar area are arranged in a transverse "V" shaped gap path 40.

[0086] In some embodiments of the present invention, the cross-shaped reinforcing structure 77, except for the pressure plate 81, overlaps with the second top plate 72 on its periphery and is connected to the second top plate 72 by glue or rivets.

[0087] The second bottom plate 80, except for the pressure plate 81, overlaps with the cross reinforcement structure 77 and the second top plate 72 on its periphery, and is connected to the cross reinforcement structure 77 by glue or rivets.

[0088] The insulation block 76 overlaps with the periphery of the second top plate 72, the second bottom plate 80, and the cross-shaped reinforcing structure 77;

[0089] The insulation block 76 is connected and fixed with glue at the contact points with the second top plate 72, the second bottom plate 80 and the cross-shaped reinforcing structure 77;

[0090] The stepped notch 56 and the mounting notch 82 are fixed together by adhesive.

[0091] The heat-insulating block 75 is located between the second top plate 72 and the pressure plate 81;

[0092] The heat-insulating block 75 is fixedly connected to the second top plate 72, the heat-insulating plate 81 and the heat-insulating block 76 at the contact points by adhesive.

[0093] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. An installation method for a two-sided corner area arrangement structure of a membrane-type enclosure system, characterized in that, The membrane-type enclosure system includes a main membrane layer, a fastening plate, a main insulation layer, a secondary membrane layer, and a secondary insulation layer, which are sequentially connected and fixed to the hull structure by through fasteners. The main membrane layer, the main insulation layer, the secondary membrane layer, and the secondary insulation layer enclose and form a cryogenic liquid cargo storage tank for containing cryogenic media. The main membrane layer is in contact with the cryogenic media. In the corner area where the two sides of the membrane enclosure system intersect, there are two corner areas of the main layer and two corner areas of the secondary layer. The installation method includes: Studs are installed on the bulkhead of the hull structure according to the set markings, along with spacer plates and studs for positioning the secondary dihedral area plane transition secondary insulation module and the dihedral area secondary insulation module of the secondary dihedral area. The two-sided corner area planar transition secondary insulation module and the two-sided corner area secondary insulation module are respectively installed onto the spacer plate by through fasteners. The bolts passing through the spacer plate extend into the spacer plunger holes opened on the insulation block of the two-sided corner area planar transition secondary insulation module and the bottom of the mounting notch groove, or extend into the spacer plunger holes opened on the bottom of the stepped notch groove of the two-sided corner area secondary insulation module. After the two-sided corner area plane transition secondary insulation module and the two-sided corner area secondary insulation module are installed, the secondary film layer is installed. The secondary film layer includes multiple secondary films with preset sizes connected by splicing. In the corner area where the two sides intersect, the boundary of each secondary film is welded and fixed to the secondary welding plate or secondary welding metal sheet of the top plate of the two-sided corner area plane transition secondary insulation module. After completing the installation of the secondary film layer in the corner area where the two sides intersect, the thermal insulation modules of the two corner areas of the main layer are installed. Each thermal insulation module of the two corner areas of the main layer is pressed and connected to the upper part of four through fasteners. The four through fasteners on the same thermal insulation module of the two corner areas of the main layer are respectively located at the four corners of the module. In the same corner area, after one thermal insulation module of the two corner areas of the main layer is installed in place with another adjacent thermal insulation module of the two corner areas of the main layer and two main insulation modules, the corresponding through fastener clamping block is installed in the corner area. The lower end of the installed clamping block presses on the middle plate of the two adjacent thermal insulation modules of the two corner areas of the main layer and two main insulation modules, and the installed clamping block is fixedly connected and locked to the upper end of the cap rod structure of the corresponding through fastener. The fastening plate includes a cross plate and a straight plate. The middle of the cross plate and the middle of the straight plate are provided with slots for installing the main layer welding metal sheet and through holes for installing through fasteners. The main layer welding metal sheet is provided with a central hole. The four long strips of the cross plate and the two long strips of the straight plate are all fixed with main layer welding plates for welding and fixing to the main layer film layer. After the fastening plate is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films with preset sizes connected by splicing. The boundary of each main layer film is welded and fixed to the main layer welding plate or main layer welding metal sheet on the fastening plate.

2. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 1, characterized in that, Before installing the spacer plate on the bulkhead of the hull structure according to the set markings, the method further includes: Lines are drawn on the bulkhead of the hull structure, and welding bases for the lower part of the through fasteners are welded on the bulkhead at the positions where through fasteners are placed, according to the lines. Nuts are pre-placed inside the welding bases before welding. A metal connecting rod is installed in connection with a through fastener fixed to the welding base, and a spacer plate is installed on the stud.

3. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 2, characterized in that, The dihedral corner area secondary insulation module includes a first bottom plate, a heat insulation block, and a metal welding plate. The second included angle between the two sides of the heat insulation block away from the first bottom plate is determined according to the angle of the dihedral corner of the hull structure, and the range of the second included angle is 80 to 160°. The dihedral corner area secondary insulation module is bonded and fixed to the bulkhead of the hull structure through the first bottom plate. The heat insulation block has a stepped notch groove at the outer edge of the two sides away from the first bottom plate, which is parallel to the straight line at the intersection of the two sides. The bifacial transition secondary insulation module includes a second top plate, four insulation blocks, a cross-shaped reinforcing structure, and a second bottom plate. The four insulation blocks are fixed within the space formed by the second top plate, the second bottom plate, and the cross-shaped reinforcing structure. The cross-shaped reinforcing structure has two central support structures, each with a through hole for installing a through fastener. Two insulation blocks at the end of the bifacial transition secondary insulation module that are in contact with the bifacial secondary insulation module have mounting notches on one side of the second top plate. The mounting notches are located near the bifacial secondary insulation module and have spaced plunger holes.

4. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 3, characterized in that, The metal connecting rod of the through fastener passes through the through hole of the central support structure on the cross-shaped reinforcing structure of the two-sided corner area plane transition secondary insulation module. The cap rod structure of the upper part of the through fastener is screwed and fixed to the metal connecting rod and welded to the secondary welding metal sheet embedded in the second top plate.

5. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 4, characterized in that, When the secondary insulation module in the two corner areas 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 interval. 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 12mm and less than 20mm according to the spacing between the epoxy resins.

6. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 5, characterized in that, The stepped notch groove has a stepped plane parallel to the side where the stepped notch groove is located, which is provided with a fixed-distance plunger hole for fixed-distance installation in the two-sided corner area of ​​the secondary layer and a fixed-distance bolt hole for fixed-distance installation in the two-sided corner area of ​​the secondary layer. The heat insulation block has metal welding plates laid at other positions on the two sides away from the first bottom plate for welding and fixing to the secondary film layer.

7. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 6, characterized in that, The two-sided corner area planar transition secondary insulation module also includes a pressure sheet insulation block and a pressure sheet plate. The top of the second top plate is provided with a welding plate groove and a welding sheet groove. After the secondary welding plate and the secondary welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surfaces of the secondary welding plate and the secondary welding metal sheet are flush with the upper surface of the second top plate. The secondary welding metal sheet is provided with connecting holes for installing through fasteners. Both the second top plate and the second bottom plate are provided with a central support structure corresponding to the cross-shaped reinforcing structure. The through hole corresponds to the mounting and fixing hole. The mounting notch is corresponding to the stepped notch. After the two-sided corner area plane transition secondary insulation module is attached to the two-sided corner area secondary insulation module, the bottom of the stepped notch and the bottom of the mounting notch are bonded and fixed. The pressing insulation block is bonded and fixed to the pressing plate, the side wall of the stepped notch and the side wall of the mounting notch. The upper part of the pressing insulation block is bonded and fixed to the second top plate. One two-sided corner area secondary insulation module corresponds to two two-sided corner area plane transition secondary insulation modules.

8. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 7, characterized in that, The step of welding and fixing the boundary of each sub-layer film to the sub-layer welding plate or sub-layer welding metal sheet of the second top plate of the sub-insulation module located in the two-sided corner area plane transition sub-insulation module includes: The edge of the secondary film adjacent to the secondary insulation module of the bifacial corner area facing the secondary insulation module is welded to the metal welding plate, and the other edges of the secondary film are welded and fixed to the secondary welding plate or secondary welding metal sheet of the secondary insulation module of the bifacial corner area plane transition. A heat protection layer is laid at the position where the boundary of the secondary film does not contact the secondary welding plate and the secondary welding metal sheet. First, intermittent spot welding is performed on the positions where the secondary film contacts the secondary welding plate, the secondary welding metal sheet, or the metal welding plate. After a whole piece of secondary film is welded, the adjacent secondary films are overlapped on the previous secondary film, and the overlapping edges are continuously welded.

9. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 8, characterized in that, The spacer plate is made of plywood or plastic alternative material that meets the rigidity requirements, and the thickness is set to at least one of 1mm, 2mm, 5mm or 10mm. The spacer plate is used for leveling. By using spacer plates of different thicknesses to stack and combine, the distance between the bottom of the two-sided corner area plane transition secondary insulation module and the two-sided corner area secondary insulation module and the bulkhead is 10mm. The diameter of the through hole on the spacer plate is 0.5-2mm larger than the outer diameter of the thread on the metal connecting rod.

10. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 9, characterized in that, The through-fastener includes an upper section and a lower section. The upper section includes a cap rod structure, a clamping block, a double-ended screw, and a metal sealing cap. The clamping block is located in the installation notches on the upper insulation blocks of the two adjacent main layer corner insulation modules and the upper insulation blocks of the two main layer insulation modules. The lower part of the clamping block is in contact with the fixing pad, and the long bolt on the clamping block locks the clamping block. The lower section of the through fastener includes a cylindrical welded base and a metal connecting rod with threads at both ends. One end of the rod passes through the secondary welded metal sheet and is fixedly connected to the cap rod structure. The other end is welded and fixed to the hull structure through the cylindrical welded base. The metal connecting rod passes through the through hole of the central support structure on the cross-shaped reinforcing structure of the two-sided corner area plane transition secondary insulation module.

11. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 10, characterized in that, The main layer dihedral insulation module includes a first top plate, an upper insulation block, a middle plate, and a lower insulation block, which are fixedly connected in sequence. The first top plate includes two rectangular plates arranged at a first included angle. The first included angle is determined according to the angle of the dihedral angle of the hull dihedral structure, and the range of the first included angle is 80° to 160°. The first top plate is provided with a through-type stress relief groove according to the structure of the main layer film layer covering it. The upper insulation block includes two rectangular insulation blocks arranged at the first included angle. The upper insulation block is provided with a non-through-type stress relief groove aligned with the through-type stress relief groove on the first top plate. The rectangular area of ​​the upper insulation block is larger than that of the first top plate. The material comprises a first top plate located in the middle of the upper rectangular insulation block, a lower insulation block comprising two rectangular insulation blocks arranged at a first included angle, a middle plate located between the upper and lower insulation blocks, and four vertices of the upper, middle, and lower insulation blocks having mounting notches for installing through fasteners. The middle plate has fixing pads at its four vertices, and the portion of the fixing pad in the lower insulation block is adapted to the shape of the mounting notch on the lower insulation block. The fixing pad is fixedly connected to the lower insulation block. The bottom of the lower insulation block has a matching groove for accommodating the protruding structure on the secondary film layer according to the shape and arrangement of the secondary film layer it contacts.

12. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 11, characterized in that, The first top plate, the middle plate, the second top plate, the cross-shaped reinforcing 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. Specifically, the low-temperature resistant non-metallic material must be able to withstand a temperature of at least -196 degrees Celsius and its strength must meet the following requirements. Vertical compressive strength ≥ 4 MPa, flexural strength ≥ 20 MPa, horizontal tensile strength ≥ 25 MPa, vertical tensile strength ≥ 1.5 MPa, shear strength ≥ 2.5 MPa. The upper insulation block, the lower insulation block, the thermal insulation 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; The secondary thin film layer is made of Invar steel, 304L stainless steel, or other low-temperature resistant metal materials prefabricated with a set corrugated shape.

13. The installation method of the two-sided corner area arrangement structure of the membrane-type enclosure system according to claim 12, characterized in that, The cross-shaped reinforcing structure, except for the pressure plate, overlaps with the second top plate on its outer periphery and is connected to the second top plate by glue or rivets. The second bottom plate, except for the pressure plate, overlaps with the cross-shaped reinforcing structure and the second top plate on its periphery, and is connected to the cross-shaped reinforcing structure by glue or rivets; The insulation block overlaps with the periphery of the second top plate, the second bottom plate, and the cross-shaped reinforcing structure; The insulation block is connected and fixed with glue at the contact points with the second top plate, the second bottom plate and the cross-shaped reinforcing structure; The stepped notch and the mounting notch are fixed together by adhesive. The heat-insulating block is located between the second top plate and the heat-insulating plate; The heat-insulating block is fixedly connected to the second top plate, the heat-insulating plate, and the heat-insulating block at their contact points by adhesive.

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