Installation method of three-corner area arrangement structure of thin film type enclosure system

Abstract

The embodiment of the present application provides a kind of installation method of three-corner 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 sequentially connected and fixed to ship structure by penetrating fastener, 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 corner area of three sides intersection, it includes three-corner area main layer insulation layer module, three-corner area secondary layer insulation layer module and three-corner area secondary layer plane transition insulation module, and installation method includes: after installing distance plate and stud for positioning on the cabin wall surface of ship structure according to setting line, penetrating fastener, three-corner area secondary layer insulation layer module, three-corner area secondary layer plane transition insulation module and other modules are installed respectively.

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 three-sided corner area 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 insulation modules are arranged in an overlapping manner, the gaps between the primary and secondary insulation modules directly connect to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, significant heat leakage still exists. For the Mark III type, because the primary insulation modules, secondary insulation modules, and secondary membrane 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 is restricted, resulting in poor overall resistance to hull movement and liquid cargo sloshing. In addition, the extensive use of adhesive 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 three-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, which are sequentially connected and fixed to the hull structure 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, the fastening plate, the main insulating layer, the secondary membrane layer, and the 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. This effectively builds a double-sealed cryogenic media storage carrier and solves the problems of cryogenic media storage and leakage prevention.

[0006] This invention provides an installation method for a three-sided 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. In the corner area where the three sides of the membrane-type enclosure system intersect, there is a three-sided corner area main insulating layer module, a three-sided corner area secondary insulating layer module, and a three-sided corner area secondary planar transition insulating module. The installation method includes:

[0007] On the ship's hull structure, spacers and studs for positioning the trihedral corner area secondary insulation layer module and the trihedral corner area secondary plane transition insulation module are installed on the ship's cabin wall according to the set markings. The trihedral corner area secondary plane transition insulation module has spacer bolt holes for studs to pass through in the corner areas other than the corner area on the side where it connects with the trihedral corner area secondary insulation module.

[0008] The trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module are respectively installed onto the spacer plate using through fasteners, wherein the studs passing through the spacer plate extend into the spacer plug holes opened on the trihedral corner area secondary planar transition insulation module.

[0009] After installing and bonding the trihedral corner area secondary insulation layer module at the trihedral corner area of ​​the hull structure, install through fasteners to complete the installation of the trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module.

[0010] Install a secondary film layer, which includes multiple secondary films of a preset size connected by splicing. In the corner area where the three sides intersect, the secondary film layer is provided with a secondary corner film end cap, and is sealed and welded to the metal welding plate of the three-sided corner secondary insulation layer module through the secondary corner film end cap, so that the secondary film on the planar secondary insulation layer module can overlap the secondary corner film end cap to form a complete and sealed secondary film.

[0011] After the installation of the secondary thin film layer is completed, the main insulation layer module of the three-sided corner area is installed. The main insulation layer module of the three-sided corner area is pressed and fixed to the adjacent main insulation layer module of the planar area or the main insulation layer module of the two-sided corner area by the clamping block of the upper part of the through fastener. The main insulation layer module of the three-sided corner area is equipped with four through fasteners for clamping connection, and the four through fasteners of the main insulation layer module of the three-sided corner area are respectively located at the four corners of the main insulation layer module of the three-sided corner area.

[0012] After the main insulation layer module of the trihedral corner area, the adjacent bihedral corner area main insulation layer module, and the planar area main insulation layer module are installed in place, a clamping block with a corresponding through fastener is installed in the corner area. The bottom metal plate of the clamping block is pressed on the fixing pad fixed to the middle plate of the trihedral corner area main insulation layer module, the fixing pad fixed to the middle plate of the bihedral corner area main insulation layer module, and the fixing pad fixed to the middle plate of the planar area main insulation layer module, and is fixedly connected and locked to the upper end of the metal connecting rod of the through fastener.

[0013] The main layer film layer is installed in the corner area where the three sides intersect. The main layer film layer adopts a transition film full coverage method. It is overlapped and welded to three main layer corner area transition films that are set parallel to each other on the three upper surfaces of the main layer insulation layer module of the three corner areas at an angle to each other. A main layer welding plate for fixing the main layer corner area transition film is provided below the overlap position. The main layer welding plate is set on the corner area transition plate. Before the overlap welding, one main layer corner area transition film is spot welded to the main layer welding plate on the corner area transition plate. Then, the other two overlapping main layer corner area transition films are welded in sequence.

[0014] 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:

[0015] Lines are drawn on the bulkhead of the ship's hull structure. Based on the lines, welding bases for the lower part of the through fasteners are welded on the bulkhead at the locations where through fasteners are placed. Nuts are pre-installed inside the welding bases before welding.

[0016] Weld the studs of the spacer plate connecting the trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module, install the metal connecting rod of the through fastener fixedly connected to the welding base, and then install the spacer plate on the studs.

[0017] In some embodiments of the present invention, the trihedral corner area secondary insulation layer module includes three secondary insulation surface structures that are respectively corresponding to the three cabin sides of the trihedral corner area of ​​the hull structure and are bonded and fixedly disposed. The included angle between any two of the three secondary insulation surface structures is determined based on the included angle between the corresponding two cabin sides in the hull structure. Each trihedral corner area secondary insulation layer module is composed of three layers, including a first bottom plate, a heat insulation block, and a metal welding plate that are bonded and fixed inward from the cabin wall in sequence. The heat insulation block in each trihedral corner area secondary insulation layer module has an inwardly recessed stepped notch groove formed on the upper edge of the side connected to the trihedral corner area secondary planar transition insulation module.

[0018] The trihedral corner area secondary planar transition insulation module includes a second top plate, four insulation blocks, a cross-shaped reinforcing structure, four central support structures, and a second bottom plate. The four insulation blocks are respectively disposed in the four spaces formed by the cross-shaped reinforcing structures between the second top plate and the second bottom plate. Each of the four rectangular insulation blocks connected to the trihedral corner area secondary insulation module has mounting holes at the four corners for installing through fasteners. The trihedral corner area secondary planar transition insulation module has an inwardly recessed mounting notch on its upper edge on the side connected to the thermal insulation block, which corresponds to the stepped notch. When the trihedral corner area secondary planar transition insulation module is connected to the thermal insulation block, it is bonded and fixed by the pressure plate at the top of the stepped notch and the mounting notch.

[0019] In some embodiments of the present invention, the installation of the through-fastener includes:

[0020] The metal connecting rod of the through fastener is inserted into the through holes of the four central support structures set on the secondary plane transition insulation module of the trihedral corner area, and the locking cap of the cap rod structure of the upper part of the through fastener is screwed and fixed to the upper end of the metal connecting rod and welded to the secondary welding metal sheet embedded in the second top plate.

[0021] In some embodiments of the present invention, the gap at the connection position between the trihedral corner region main layer insulation module and the planar region main layer insulation module and the gap at the connection position between the trihedral corner region secondary layer insulation module and the trihedral corner region secondary layer planar transition insulation module are in different planes.

[0022] In some embodiments of the present invention, the width of each of the three main insulating surface structures of the trihedral corner region main insulating layer module is greater than the width of the secondary insulating surface structures of the trihedral corner region secondary insulating layer module that are respectively provided corresponding to the three main insulating surface structures.

[0023] In some embodiments of the present invention, a spaced plunger hole is provided on the stepped plane parallel to the side of the cabin where the stepped notch is located, at the end away from the main layer insulation module of the trihedral corner area, for mounting the spaced plate of the secondary layer plane transition insulation module of the trihedral corner area.

[0024] In some embodiments of the present invention, the trihedral corner area secondary planar transition insulation module further includes a secondary welding metal sheet, a secondary welding plate, 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 a connecting hole for installing a through-fastener. The second top plate and... The second bottom plate is provided with mounting holes corresponding to the through holes of the central support structure on the cross-shaped reinforcing structure. The mounting notch is provided in correspondence with the stepped notch. When the trihedral corner area secondary insulation layer module is connected to the trihedral corner area secondary plane transition insulation module, the stepped notch is bonded and fixed to the bottom pressure plate of the mounting notch. The pressure plate insulation block is bonded and fixed to the pressure plate, the side wall of the stepped notch, and the side wall of the mounting notch. The upper part of the pressure plate insulation block is bonded and fixed to the second top plate.

[0025] In some embodiments of the present invention, when the trihedral corner area secondary plane transition insulation module is bonded and fixed to the cabin wall of the hull structure through the second bottom plate, strip-shaped epoxy resin is bonded between the second bottom plate and the side wall of the hull structure at a distance, and the height of the epoxy resin between the second bottom plate and the side wall of the hull structure is set to be greater than 12mm and less than 20mm according to the distance between the epoxy resins.

[0026] The spacer plate is made of plywood or a 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 trihedral corner area secondary plane transition insulation module and the bottom of the trihedral corner area secondary insulation layer module and the cabin wall is 10mm.

[0027] 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 stud.

[0028] 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,

[0029] 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 main insulation layer module of the three-sided corner area and the adjacent main insulation layer module of the planar area and the main insulation layer module of the two-sided corner area. The metal plate at the bottom of the clamping block is in contact with the fixing pad. The long bolt on the clamping block locks the clamping block.

[0030] 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 welded base. The metal connecting rod passes through the through hole of the central support structure on the secondary planar transition insulation module of the trihedral corner area.

[0031] In some embodiments of the present invention, the trihedral corner area main insulation layer module includes three main insulation surface structures that correspond to and are bonded and fixedly disposed on the three cabin sides of the trihedral corner area of ​​the hull structure. The included angle between any two of the three main insulation surface structures is determined based on the included angle between the corresponding two cabin sides in the hull structure. Each trihedral corner area main insulation layer module consists of four layers, including a first top plate, an upper insulation block, a middle plate, and a lower insulation block that are bonded and fixed sequentially from the inner side away from the cabin wall to the side closer to the cabin wall. The trihedral corner area main insulation layer module has an installation notch at the corner where it connects to the two corner area main insulation layer modules. Each installation notch has a fixing pad that is fixed to the middle plate and whose shape matches the installation notch in the lower insulation block portion.

[0032] In some embodiments of the present invention, the first top plate, the middle plate, the first bottom plate, the second top plate, the cross-shaped reinforcing structure, 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; the strength must meet the following requirements, specifically,

[0033] 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.

[0034] The heat insulation block, the upper heat insulation block, the lower heat insulation block, and the heat 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;

[0035] Both the main film of the main film layer and the secondary film of the secondary film layer are made of Invar steel, 304L stainless steel or other low-temperature resistant metal materials with a pre-formed corrugated shape.

[0036] In some embodiments of the present invention, the periphery of the cross-shaped reinforcing structure, except for the pressure plate, overlaps with the second top plate and is connected to the second top plate by glue or rivets.

[0037] Except for the pressure plate, the outer periphery of the second bottom plate overlaps with the cross-shaped reinforcing structure and the second top plate, and is connected to the cross-shaped reinforcing structure by glue or rivets.

[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 pressing plate is located at the bottom of the mounting notch and is bonded and fixed to the adjacent insulation block with glue. The pressing plate extends a second bottom plate in the direction of the ship cabin wall parallel to the pressing plate near the secondary insulation layer module of the trihedral corner area.

[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 three-sided corner structure of the thin-film 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 three-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 three-sided corner is bonded to the hull structure with epoxy resin, and the main insulation layer module of the three-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 three-sided corner have relative motion tolerance. Attached Figure Description

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

[0044] Figure 2 This is a schematic cross-sectional view of the trihedral corner area arrangement of the membrane enclosure system in the installation method of the trihedral corner area arrangement structure of the membrane enclosure system provided in the embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the transition structure of the trihedral corner area in the installation method of the trihedral corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention;

[0046] Figure 4 A schematic diagram of the arrangement of the trihedral corner zone modules in the hull structure in the installation method of the trihedral corner zone 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 trihedral corner insulation module structure in the installation method of the trihedral corner arrangement structure of the membrane enclosure system provided in the embodiment of the present invention;

[0048] Figure 6 The diagram shows an exploded view of the trihedral corner insulation module structure in the installation method of the trihedral corner arrangement structure of the membrane enclosure system provided in this embodiment of the invention.

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

[0050] Figure 8 A schematic diagram of the secondary planar transition insulation module structure in the trihedral corner area of ​​the film-type enclosure system provided in the embodiment of the present invention.

[0051] Figure 9 This is an exploded view of the secondary planar transition insulation module structure in the trihedral corner area of ​​the installation method of the trihedral corner area arrangement structure of the membrane-type enclosure system provided in the embodiment of the present invention.

[0052] Figure 10 This is a schematic diagram of the installation of the secondary insulating layer and the secondary film layer in the installation method of the trihedral corner area arrangement structure of the film-type enclosure system provided in the embodiment of the present invention.

[0053] Figure 11 This is a schematic diagram of the main insulation layer installation method in the installation method of the three-sided corner area arrangement structure of the film-type enclosure system provided in the embodiment of the present invention;

[0054] Figure 12 This is a schematic diagram of the installation of the main film layer in the installation method of the three-sided corner area arrangement structure of the film-type enclosure system provided in the embodiment of the present invention.

[0055] Figure Labels

[0056] 1. Welded base; 2. Nut; 3. Metal connecting rod; 4. Secondary welded metal sheet; 10. Lower section of through fastener; 11. Cap rod structure; 12. Bottom metal plate; 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. Hull structure; 27. Cabin wall; 28. Through fastener; 29. ​​Epoxy resin; 31. Secondary insulation layer; 31a. Planar area secondary insulation layer module; 32. Secondary thin layer 32a, Secondary film layer; 33, Main insulating layer; 33a, Planar area main insulating layer module; 34, Main film layer; 34a, Main film layer; 35, Fastening plate; 35c, Corner transition plate; 36, Spacing plate; 37, Stud; 38, Main welding plate; 48, Main insulating surface structure; 49, Secondary insulating surface structure; 50, Two-sided corner area secondary insulating layer module; 50a, 90° two-sided corner area secondary insulating layer module; 50b, 135° two-sided corner area secondary insulating layer module; 51, First bottom plate; 5 2. Thermal insulation block; 53. Metal welded plate; 54. Spacing plunger hole; 55. Spacing bolt hole; 56. Stepped notch groove; 60. Main insulation layer module for bifacial corner area; 60a. Main insulation layer module for 90° bifacial corner area; 60b. Main insulation layer module for 135° bifacial corner area; 61. Upper insulation block; 62. Lower insulation block; 63. First top plate; 64. Middle plate; 65. Fixing pad; 69. Installation notch; 70. Secondary insulation layer module for bifacial corner area plane transition; 71. Secondary welded plate; 72. Second top plate; 73. Welding plate groove; 74. Welding plate groove; 75. Pressed insulation block; 76. Insulation block; 77. Cross-shaped reinforcing structure; 78. Through hole; 79. Central support structure; 80. Second bottom plate; 81. Pressed plate; 82. Installation notch groove; 84. Main layer corner transition film; 85. Secondary layer corner film end cap; 90. Three-sided corner secondary layer planar transition insulation module; 100. Three-sided corner module; 101. Three-sided corner main layer insulation module; 102. Three-sided corner secondary layer insulation module; Detailed Implementation

[0057] 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.

[0058] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] This invention provides an installation method for a three-sided corner area arrangement structure of a membrane-type enclosure system, such as... Figures 1 to 12 As shown, the membrane-type enclosure system includes a main membrane layer 34, a fastening plate 35, a main insulating layer 33, a secondary membrane layer 32, and a secondary insulating layer 31, which are sequentially connected and fixed to the hull structure 26 via through fasteners 28. The main membrane layer 34, the main insulating layer 33, the secondary membrane layer 32, and the secondary insulating layer 31 enclose a cryogenic liquid cargo storage tank for containing cryogenic media. The main membrane layer 34 is in contact with the cryogenic media. Specifically, through the main membrane layer... A primary insulating layer 33 and a fastening plate 35 are provided between the primary film layer 34 and the secondary film layer 32, and a secondary insulating layer 31 is provided between the secondary film layer 32 and the hull structure 26. Thus, the primary insulating structure and gaps between the primary film layer 34 and the secondary film layer 32 form a primary shielding space, and the secondary insulating structure and gaps between the secondary film layer 32 and the hull structure 26 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.

[0065] In the film-type enclosure system, a trihedral corner module 100 is provided in each corner area where the three sides intersect. The trihedral corner module 100 includes a trihedral corner main insulation layer module 101 and a trihedral corner secondary insulation layer module 102. The installation method of the trihedral corner arrangement structure of the film-type enclosure system includes:

[0066] Lines are drawn on the bulkhead 27 of the hull structure 26. Then, according to the lines, welding bases 1 for the lower section 10 of the through fastener 28 are welded to the bulkhead at the locations where they will be placed. Before welding, nuts 2 are embedded in the welding bases 1. Then, studs 37 of the spacer plate 36 connecting the trihedral corner secondary insulation module 102 and the trihedral corner secondary planar transition insulation module 90 are welded. In actual operation, through fasteners for positioning the planar secondary insulation module 31a are also welded to the bulkhead 27 according to the lines. The lower section 10 includes a welding base 1 and corresponding studs 37; wherein, the four corners of the spacer plate 36 are symmetrically arranged with respect to the center line of the spacer plate 36, and a stud 37 is inserted in each through hole; the through fastener 28 includes an upper section 25 and a lower section 10, the lower section 10 includes a cylindrical welding base 1 and a metal connecting rod 3 with threads at both ends, the upper section 25 includes a cap rod structure 11, a clamping block 21, a double-ended screw 22 and a metal sealing cap 23.

[0067] After installing the stud 37 and the welding base 1, install the metal connecting rod 3 of the through fastener 28 fixedly connected to the welding base 1, and the mounting spacer plate 36 on the stud. Of course, in actual operation, depending on the actual situation on site, if installing all the metal connecting rods 3 of the through fastener 28 may affect the installation of the trihedral corner area secondary insulation layer module 102, then the metal connecting rods of the through fastener 28 can be installed later, or only some of the metal connecting rods 3 of the through fastener 28 can be installed, so as not to affect the installation of the trihedral corner area secondary insulation layer module 102. The trihedral corner area secondary planar transition insulation module 90 is provided with spacer plug holes 54 for the stud 37 to pass through at the corner area other than the corner area on the side that is connected to the trihedral corner area secondary insulation module 102, and then connects to the planar area secondary insulation layer module 31a and the bihedral corner area planar transition secondary insulation layer module 70 through the spacer plate 36.

[0068] After the spacer plate 36 is fitted onto the stud 37, the stud passing through the spacer plate 36 is inserted into the spacer plug hole 54 opened on the trihedral corner area secondary planar transition insulation module. The trihedral corner area secondary insulation module 102 includes three secondary insulation surface structures 49, each corresponding to one of the three cabin sides of the trihedral corner area of ​​the hull structure 26 and bonded and fixedly disposed thereon. The included angle between any two of the three secondary insulation surface structures 49 is determined based on the included angle between the corresponding two cabin sides in the hull structure 26. For example, if the included angle between two cabin sides is 90 degrees, then the included angle between the two secondary insulation surface structures corresponding to those two cabin sides can also be 90 degrees. Correspondingly, the 90° bihedral corner area secondary insulation module 50a can be found in [reference needed]. Figure 1 As shown; of course, it can also be between 85 degrees and 95 degrees. For example, if the included angle between the two sides of the ship's cabin is 135 degrees, then the included angle between the two secondary insulation surface structures 49 corresponding to the two sides of the ship's cabin can be 135 degrees. Correspondingly, the secondary insulation layer module 50b of the 135° dihedral corner area can be found in [reference needed]. Figure 1 As shown, the angle can also be between 130 and 140 degrees, meaning the included angle between any two sides of the trihedral corner secondary insulation module 102 can differ from the included angle between the corresponding two cabin sides within a certain range. Each trihedral corner secondary insulation module 102 consists of three layers, including a first bottom plate 51, a thermal insulation block 52, and a metal welding plate 53, which are sequentially bonded and fixed from the cabin wall 27 inwards. The thermal insulation block 52 in each trihedral corner secondary insulation module 102 has an inwardly recessed stepped notch 56 formed on the upper edge of the side connected to the trihedral corner secondary planar transition insulation module 90. The corner area secondary plane transition insulation module 90 has an inwardly recessed mounting notch 82 on the upper edge of the side connected to the thermal insulation block 52, which corresponds to the stepped notch 56. When the trihedral corner area secondary plane transition insulation module 90 is connected to the thermal insulation block 52, it is bonded and fixed by the pressure plate 81 at the top of the stepped notch 56 and the mounting notch 82. The stepped notch 56 has a spacer plunger hole 54 on the step plane parallel to the side of the cabin where the stepped notch 56 is located, at the end away from the trihedral corner area main insulation layer module 101, for the installation of the spacer plate 36 of the trihedral corner area secondary plane transition insulation module 90.

[0069] Furthermore, the trihedral corner area secondary planar transition insulation module 90 includes a second top plate 72, four insulation blocks 76, a cross-shaped reinforcing structure 77, four central support structures 79, and a second bottom plate 80. The four insulation blocks are respectively disposed in the four spaces formed by the cross-shaped reinforcing structure 77 between the second top plate 72 and the second bottom plate 80, and the four central support structures 79 are provided with through holes 78 in the middle for installing through fasteners 28.

[0070] In this embodiment, the second bottom plate 80 is also provided with a distance bolt hole 55 that is concentrically arranged with the through hole on the distance plate 36, and the second top plate 72 and the insulation block are provided with a distance plunger hole 54 that is concentrically arranged with the corresponding through hole and has a hole diameter of 2-4 times the corresponding through hole diameter, so as to facilitate the gasket, fastening nut and tooling to lock the distance plate 36. Furthermore, after the four studs 37 on each spacer plate 36 are locked with nuts 2, plungers of the same material as the insulation block are used to fill the spacer plunger holes 54 on each trihedral corner secondary plane transition insulation module, so that each trihedral corner secondary plane transition insulation module 90 can be interconnected with the adjacent plane secondary insulation module 31a or with the bihedral corner secondary insulation module 50, thus providing auxiliary anchoring for the trihedral corner secondary plane transition insulation module 90 and the adjacent bihedral corner secondary plane transition insulation module 70 or with the bihedral corner secondary insulation module 50.

[0071] Furthermore, the spacer plate 36 is made of plywood or a plastic substitute 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 using spacer plates 36 of different thicknesses to stack and combine, the distance between the bottom of the three-sided corner area secondary plane transition insulation module, the adjacent two-sided corner area plane transition secondary insulation layer module 70, or the adjacent two-sided corner area secondary insulation layer module 50 and the cabin wall 27 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 nut 2.

[0072] After the stud 37 is installed and the trihedral corner area secondary insulation layer module 102 is installed and bonded to the trihedral corner area of ​​the hull structure 26, the through fastener 28 is installed. The metal connecting rod 3 of the through fastener 28 is passed through the through holes 78 of the four central support structures 79 provided on the trihedral corner area secondary plane transition insulation module 90. The cap rod structure 11 of the upper part 25 of the through fastener is screwed and fixed to the upper end of the metal connecting rod 3 and welded to the main layer welding metal sheet 24 embedded in the second top plate 72.

[0073] In this embodiment, of the four central support structures 79, one is located at the center of the cross of the cross reinforcement structure 77, two are located at the extended ends of two adjacent upright plates in the cross of the cross reinforcement structure 77, and the other is arranged in a rectangle with the aforementioned three central support structures 79, located at the end of the rectangle closest to the main layer insulation module 101 of the trihedral corner area. The four central support structures 79 can be formed by structural components that are directly fixedly connected to the cross reinforcement structure 77 or by structural components that are directly fixedly connected to the second bottom plate 80 of the secondary layer planar transition insulation module 90 of the trihedral corner area.

[0074] After the trihedral corner area secondary insulation layer module 102 and the trihedral corner area secondary planar transition insulation module 90 are installed, the secondary film layer 32 is installed. Of course, in actual operation, before installing the secondary film layer 32, the bihedral corner area secondary insulation layer module 50 and the bihedral corner area planar transition secondary insulation layer module 70 are installed first, and at the same time, the planar area secondary insulation layer module 31a is installed to form a complete secondary insulation layer. After that, the secondary film layer 32 is installed.

[0075] In this embodiment, the secondary film layer 32 is made of Invar steel or 304L stainless steel or other low-temperature resistant metal material prefabricated with a predetermined corrugated shape. The secondary film layer may include multiple secondary films 32a of predetermined dimensions connected by splicing. Specifically, in the corner area where the three sides intersect, the secondary film layer is provided with a secondary corner film end cap 85. This end cap 85 is sealed and welded to the metal welding plate 53 of the three-sided corner secondary insulation layer module 102, so that the secondary insulation layer module 31 located in the planar area... The secondary film 32a on the a can overlap the secondary corner film end cap 85 to form a complete and sealed corner secondary film layer 32, and then the secondary film 32a on the planar secondary insulation module 31a is installed in sequence. Similarly, for the corner area where the two sides intersect, the same method can be used to first complete the sealing welding and fixing of the edges of the secondary film 32a on the two corner secondary insulation modules, and then complete the installation of the secondary film 32a on the planar secondary insulation module 31a, and finally form a complete secondary film layer 32.

[0076] After the installation of the secondary thin film layer 32 is completed, the main layer trihedral corner area main layer insulation module 101 is installed. The trihedral corner area main layer insulation module 101 is pressed and fixed to the adjacent planar area main layer insulation module 33a or bihedral corner area main layer insulation module 60 by the clamping block 21 of the upper part 25 of the through fastener. The bihedral corner area main layer insulation module 60 includes a 90° bihedral corner area main layer insulation module 60a and a 135° bihedral corner area main layer insulation module 60b. The trihedral corner area main layer insulation module 101 is equipped with four through fasteners 28 for pressing connection. The four through fasteners 28 are respectively located at the four corners of the trihedral corner area main layer insulation module 101.

[0077] After the main insulation layer module 101 of the trihedral corner area, the adjacent main insulation layer module 60 of the bihedral corner area, and the main insulation layer module 33a of the planar area are installed in place, the corresponding through fastener 28 clamping block 21 is installed in the corner area. The bottom metal plate 12 of the clamping block 21 is pressed on the fixing pad 65 fixed to the middle plate 64 of the trihedral corner area main insulation layer module 101, the fixing pad 65 fixed to the middle plate 64 of the bihedral corner area main insulation layer module, and the fixing pad 65 fixed to the middle plate 64 of the main insulation layer, and is fixedly connected and locked to the upper end of the metal connecting rod 3. The bihedral corner area main insulation layer module 60 includes a 90° bihedral corner area main insulation layer module 60a and a 135° bihedral corner area main insulation layer module 60b.

[0078] In this embodiment, the trihedral corner area main insulation layer module 101 includes three main insulation surface structures 48 that correspond to and are fixedly bonded to the three cabin sides of the trihedral corner area of ​​the hull structure 26. The included angle between any two of the three main insulation surface structures 48 is determined based on the included angle between the corresponding two cabin sides of the hull structure 26. Each trihedral corner area main insulation layer module 101 consists of four layers, including a first top plate 63, an upper insulation block 61, a middle plate 64, and a lower insulation block 62 that are sequentially bonded and fixed from the inner side away from the cabin wall 27 to the side closer to the cabin wall 27. The trihedral corner area main insulation layer module 101 has an installation notch 69 at the corner where it connects to the two-corner area main insulation layer module 60. Each installation notch 69 has a fixing pad 65 that is fixed to the middle plate 64 and whose shape matches the installation notch 69 in the lower insulation block 62.

[0079] In this embodiment, each of the three cabin sides in the trihedral corner area of ​​the hull structure 26 is perpendicularly arranged to at least one of the fixing blocks 65, and the fixing blocks 65 are flush with the side of the lower insulation block 62 away from the middle plate 64.

[0080] After the main insulation layer module 101 in the trihedral corner area is installed, the main film layer 34 is installed. Of course, in the actual operation, before installing the main film layer, the secondary insulation layer module 50 in the bihedral corner area and the secondary insulation layer module 70 in the bihedral corner area planar transition area are installed first, and at the same time, the secondary insulation layer module 31a in the planar area is installed, thus forming a complete main insulation layer 33. After that, the main film layer 34 is installed.

[0081] In this embodiment, the main layer film layer 34 is made of Invar steel, 304L stainless steel, or other low-temperature resistant metal material prefabricated with a set corrugated shape. When installing the main layer film layer 34 in the corner area where the three sides intersect, the main layer film layer 34 adopts a transition film full-coverage method, and is respectively overlapped and welded to three main layer corner area transition films 84 arranged parallel to each other on the three upper surfaces of the three-sided corner area main layer insulation layer module 101 at an angle to each other. A main layer welding plate 38 for fixing the main layer corner area transition film 84 is provided below the overlap position. The main layer welding plate 38 is set on the corner area transition plate 35c. Before overlapping welding, one main layer corner area transition film 84 is... The main layer welding plate 38 is welded to the corner transition plate 35c. Then, two more overlapping main layer corner transition films 84 are welded in sequence. After that, the main layer film 34a on the main layer insulation module 33a in the planar area is overlapped on the main layer corner transition film 84, and the overlapping edge is continuously welded and the operation is repeated to form a complete and sealed three-sided corner main layer film layer 34. Similarly, for the corner area where the two sides intersect, the same method can be used. First, the sealing welding and fixing of the edge of the main layer corner transition film 84 on the two-sided corner main insulation module 60 is completed, and then the installation of the main layer film layer on the main insulation module in the planar area is completed, and finally the complete main layer film layer 34 is formed.

[0082] In some embodiments of the present invention, the gap at the connection position between the trihedral corner main insulation layer module 101 and the planar main insulation layer module 33a and the gap at the connection position between the trihedral corner secondary insulation layer module 102 and the trihedral corner secondary planar transition insulation module 90 are in different planes. As an example, in the trihedral corner, in the direction of the three cargo tank side lines between the three ship compartment sides corresponding to the trihedral corner main insulation layer module 101, the length of the trihedral corner main insulation layer module 101 on each side line is shorter than that of the trihedral corner secondary insulation layer module 102, thereby ensuring that the gap between the trihedral corner secondary insulation module and the adjacent two trihedral corner secondary insulation modules and the gap between the trihedral corner main insulation module and the adjacent two trihedral corner main insulation modules do not overlap.

[0083] Meanwhile, in this embodiment, the width of each of the three main insulating surface structures 48 in the trihedral corner region main insulating layer module 101 is greater than the width of the secondary insulating surface structures 49 in the trihedral corner region secondary insulating layer module 102 that are respectively provided corresponding to the three main insulating surface structures 48.

[0084] Further, in this embodiment, the trihedral corner area secondary planar transition insulation module 90 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 28. The second top plate 72 and the second... The bottom plate 80 is provided with mounting holes corresponding to the through holes 78 of the central support structure 79 on the cross reinforcement structure 77. The mounting notch 82 is provided corresponding to the stepped notch 56. When the trihedral corner area secondary insulation layer module 102 is connected to the trihedral corner area secondary plane transition insulation module 90, the stepped notch 56 is bonded and fixed to the bottom pressing plate 81 of the mounting notch 82. The pressing heat insulation block 75 is bonded and fixed to the pressing plate 81, the side wall of the stepped notch 56 and the side wall of the mounting notch 82. The upper part of the pressing heat insulation block 75 is bonded and fixed to the second top plate 72.

[0085] Furthermore, in some embodiments of the present invention, when the trihedral corner area secondary planar transition insulation module 90 is bonded and fixed to the cabin wall 27 of the hull structure 26 via the second bottom plate 80, strip-shaped epoxy resin 29 is adhered between the second bottom plate 80 and the side wall of the hull structure 26 at a distance. The height of the epoxy resin 29 between the second bottom plate 80 and the side wall of the hull structure 26 is set to be greater than 12 mm and less than 20 mm according to the distance between the epoxy resin 29.

[0086] In some embodiments of the present invention, the upper section 25 of the through fastener includes a lower end cap structure 11, a clamping block 21, a double-ended screw 22 and a metal sealing cap 23. The clamping block 21 is disposed in the mounting notch 82 opened on the main insulation layer module 101 of the trihedral corner area and the adjacent main insulation layer module 33a of the planar area and the main insulation layer module 60 of the bihedral corner area. The bottom metal plate 12 of the clamping block 21 is attached to the fixing pad 65. The long bolt 19 on the clamping block 21 locks the clamping block 21.

[0087] The lower section 10 of the through fastener includes a cylindrical welded base 1 and a metal connecting rod 3 with threads at both ends. One end of the rod 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 26 through the welded base 1. The metal connecting rod 3 passes through the through hole 78 of the central support structure 79 on the secondary plane transition insulation module 90 in the trihedral corner area.

[0088] In some embodiments of the present invention, the first top plate 63, the middle plate 64, the first bottom plate 51, the second top plate 72, the cross-shaped reinforcing structure 77, 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 is capable of withstanding a temperature of at least -196 degrees Celsius. Specifically, the vertical compressive strength is greater than or equal to 4 MPa, the flexural strength is greater than or equal to 20 MPa, the horizontal tensile strength is greater than or equal to 25 MPa, the vertical tensile strength is greater than or equal to 1.5 MPa, and the shear strength is greater than or equal to 2.5 MPa.

[0089] The heat insulation block 52, the upper heat insulation block 61, the lower heat insulation block 62 and the heat 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 0.1W / m·K;

[0090] Both the main layer film 34a and the secondary layer film 32a are made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials prefabricated with a set corrugated shape.

[0091] 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.

[0092] Except for the pressure plate 81, the periphery of the second bottom plate 80 overlaps with the cross reinforcement structure 77 and the second top plate 72, and is connected to the cross reinforcement structure 77 by glue or rivets.

[0093] 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;

[0094] The pressing plate 81 is located at the bottom of the mounting notch and is bonded and fixed to the adjacent insulation block 76 with glue. The pressing plate 81 extends the second bottom plate 80 from the secondary insulation layer module 102 near the trihedral corner area towards the ship cabin wall 27 parallel to the pressing plate 81.

[0095] The heat-insulating block 75 is located between the second top plate 72 and the pressure plate 81;

[0096] 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.

[0097] 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 three-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 via 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 three sides of the membrane-type enclosure system intersect, there is a three-sided corner area main insulation layer module, a three-sided corner area secondary insulation layer module, and a three-sided corner area secondary planar transition insulation module. The installation method includes: On the ship's hull structure, spacers and studs for positioning the trihedral corner area secondary insulation layer module and the trihedral corner area secondary plane transition insulation module are installed on the ship's cabin wall according to the set markings. The trihedral corner area secondary plane transition insulation module has spacer bolt holes for studs to pass through in the corner areas other than the corner area on the side where it connects with the trihedral corner area secondary insulation module. The trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module are respectively installed onto the spacer plate using through fasteners, wherein the studs passing through the spacer plate extend into the spacer plug holes opened on the trihedral corner area secondary planar transition insulation module. After installing and bonding the trihedral corner area secondary insulation layer module at the trihedral corner area of ​​the hull structure, install through fasteners to complete the installation of the trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module. Install a secondary film layer, which includes multiple secondary films of a preset size connected by splicing. In the corner area where the three sides intersect, the secondary film layer is provided with a secondary corner film end cap, and is sealed and welded to the metal welding plate of the three-sided corner secondary insulation layer module through the secondary corner film end cap, so that the secondary film on the planar secondary insulation layer module can overlap the secondary corner film end cap to form a complete and sealed secondary film layer. After the installation of the secondary thin film layer is completed, the main insulation layer module of the three-sided corner area is installed. The main insulation layer module of the three-sided corner area is pressed and fixed to the adjacent main insulation layer module or the main insulation layer module of the two-sided corner area by the clamping block of the upper part of the through fastener. The main insulation layer module of the three-sided corner area is equipped with four through fasteners for clamping connection, and the four through fasteners of the main insulation layer module of the three-sided corner area are respectively located at the four corners of the main insulation layer module of the three-sided corner area. After the main insulation layer module of the trihedral corner area, the adjacent bihedral corner area main insulation layer module, and the planar area main insulation layer module are installed in place, a clamping block with a corresponding through fastener is installed in the corner area. The bottom metal plate of the clamping block is pressed on the fixing pad fixed to the middle plate of the trihedral corner area main insulation layer module, the fixing pad fixed to the middle plate of the bihedral corner area main insulation layer module, and the fixing pad fixed to the middle plate of the planar area main insulation layer module, and is fixedly connected and locked to the upper end of the metal connecting rod of the through fastener. The main layer film layer is installed in the corner area where the three sides intersect. The main layer film layer adopts a transition film full coverage method. It is overlapped and welded to three main layer corner area transition films that are set parallel to each other on the three upper surfaces of the main layer insulation layer module of the three corner areas at an angle to each other. A main layer welding plate for fixing the main layer corner area transition film is provided below the overlap position. The main layer welding plate is set on the corner area transition plate. Before the overlap welding, one main layer corner area transition film is spot welded to the main layer welding plate on the corner area transition plate. Then, the other two overlapping main layer corner area transition films are welded in sequence.

2. The installation method of the three-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 ship's hull structure according to the set markings, the method further includes: Lines are drawn on the bulkhead of the ship's hull structure. Based on the lines, welding bases for the lower part of the through fasteners are welded on the bulkhead at the locations where through fasteners are placed. Nuts are pre-installed inside the welding bases before welding. Weld the studs of the spacer plate connecting the trihedral corner area secondary insulation layer module and the trihedral corner area secondary planar transition insulation module, install the metal connecting rod of the through fastener fixedly connected to the welding base, and then install the spacer plate on the studs.

3. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 2, characterized in that, The trihedral corner area secondary insulation layer module includes three secondary insulation surface structures that correspond to and are bonded and fixedly installed on the three cabin sides of the trihedral corner area of ​​the hull structure. The included angle between any two of the three secondary insulation surface structures is determined based on the included angle between the corresponding two cabin sides in the hull structure. Each trihedral corner area secondary insulation layer module consists of three layers, including a first bottom plate, a heat insulation block, and a metal welding plate that are bonded and fixed inward from the cabin wall. The heat insulation block in each trihedral corner area secondary insulation layer module has an inwardly recessed stepped notch groove on the upper edge of the side connected to the trihedral corner area secondary planar transition insulation module. The trihedral corner area secondary planar transition insulation module includes a second top plate, four insulation blocks, a cross-shaped reinforcing structure, four central support structures, and a second bottom plate. The four insulation blocks are respectively disposed in the four spaces formed by the cross-shaped reinforcing structures between the second top plate and the second bottom plate. Each of the four rectangular insulation blocks connected to the trihedral corner area secondary insulation module has mounting holes at the four corners for installing through fasteners. The trihedral corner area secondary planar transition insulation module has an inwardly recessed mounting notch on its upper edge on the side connected to the thermal insulation block, which corresponds to the stepped notch. When the trihedral corner area secondary planar transition insulation module is connected to the thermal insulation block, it is bonded and fixed by the pressure plate at the top of the stepped notch and the mounting notch.

4. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 3, characterized in that, The installation of the through-fastener includes: The metal connecting rod of the through fastener is inserted into the through holes of the four central support structures set on the secondary plane transition insulation module of the trihedral corner area, and the cap rod structure of the upper part of the through fastener is screwed and fixed to the upper end of the metal connecting rod and welded to the secondary welding metal sheet embedded in the second top plate.

5. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 4, characterized in that, The gap at the connection point between the trihedral corner main layer insulation module and the planar main layer insulation module and the gap at the connection point between the trihedral corner secondary layer insulation module and the trihedral corner secondary planar transition insulation module are in different planes.

6. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 5, characterized in that, In the trihedral corner region primary insulation layer module, the width of each of the three primary insulation surface structures is greater than the width of the secondary insulation surface structures in the trihedral corner region secondary insulation layer module that are respectively set corresponding to the three primary insulation surface structures.

7. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 6, characterized in that, On the stepped notch, parallel to the side of the cabin where the stepped notch is located, there is a spaced plunger hole at the end away from the main insulation layer module of the trihedral corner area, for mounting the spaced plate of the secondary plane transition insulation module of the trihedral corner area.

8. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 7, characterized in that, The trihedral corner area secondary planar transition insulation module further includes a secondary welding metal sheet, a secondary welding plate, 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 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. The second top plate and the second bottom plate... Each material is provided with mounting and fixing holes corresponding to the through holes of the central support structure on the cross-shaped reinforcing structure. The mounting notch is provided in correspondence with the stepped notch. When the trihedral corner area secondary insulation layer module is connected to the trihedral corner area secondary plane transition insulation module, the stepped notch is bonded and fixed to the bottom pressing plate of the mounting notch. 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.

9. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 8, characterized in that, When the secondary plane transition insulation module in the trihedral corner area is bonded and fixed to the cabin wall of the hull structure through the second bottom plate, strip-shaped epoxy resin is bonded between the second bottom plate and the side wall of the hull structure. The height of the epoxy resin between the second 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. The spacer plate is made of plywood or a 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 trihedral corner area secondary plane transition insulation module and the bottom of the trihedral corner area secondary insulation layer module and the cabin wall is 10mm. 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 stud.

10. The installation method of the three-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, wherein... 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 main insulation layer module of the three-sided corner area and the adjacent main insulation layer module of the planar area and the main insulation layer module of the two-sided corner area. The metal plate at the bottom of the clamping block is in contact with the fixing pad. 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 connecting 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 welded base. The metal connecting rod passes through the through hole of the central support structure on the secondary planar transition insulation module of the trihedral corner area.

11. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 10, characterized in that, The trihedral corner area main insulation layer module includes three main insulation surface structures that correspond to and are bonded to the three cabin sides of the trihedral corner area of ​​the hull structure. The included angle between any two of the three main insulation surface structures is determined based on the included angle between the corresponding two cabin sides in the hull structure. Each trihedral corner area main insulation layer module consists of four layers, including a first top plate, an upper insulation block, a middle plate, and a lower insulation block that are bonded to the side of the hull wall from the inner side away from the cabin wall. The trihedral corner area main insulation layer module has an installation notch at the corner where it connects to the two corner area main insulation layer modules. Each installation notch has a fixing pad that is fixed to the middle plate and whose shape matches the installation notch in the lower insulation block portion.

12. The installation method of the three-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 first bottom plate, the second top plate, the cross-shaped reinforcing structure, 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; the strength must meet the following requirements, specifically, 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 heat insulation block, the upper heat insulation block, the lower heat insulation block, and the heat 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; Both the main film of the main layer and the secondary film of the secondary layer are made of low-temperature resistant metal material with a pre-formed corrugated shape.

13. The installation method of the three-sided corner area arrangement structure of the membrane-type enclosure system according to claim 12, characterized in that, Except for the pressure plate, the outer periphery of the cross-shaped reinforcing structure overlaps with the second top plate and is connected to the second top plate by glue or rivets. Except for the pressure plate, the outer periphery of the second bottom plate overlaps with the cross-shaped reinforcing structure and the second top plate, and is connected to the cross-shaped reinforcing structure by glue or rivets. 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 pressing plate is located at the bottom of the mounting notch and is bonded and fixed to the adjacent insulation block with glue. The pressing plate extends a second bottom plate in the direction of the ship cabin wall parallel to the pressing plate near the secondary insulation layer module of the trihedral corner area. 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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