Mounting method for dihedral-corner-area arrangement structure of thin-film-type enclosure system

Abstract

Provided is a mounting method for a dihedral-corner-area arrangement structure of a thin-film-type enclosure system. The thin-film-type enclosure system comprises a main-layer thin film layer, a fastening attachment plate, a main-layer insulating layer, a secondary-layer thin film layer and a secondary-layer insulating layer, which are sequentially connected and fixed to a ship body structure by means of penetrating fasteners. The mounting method comprises: according to set scribe lines and on a cabin wall of the ship body structure, mounting spacer plates and studs for positioning the spacer plates for a dihedral-corner-area planar transition secondary insulating module and a dihedral-corner-area secondary insulating module in a secondary-layer dihedral corner area; and then mounting the dihedral-corner-area planar transition secondary insulating module, the dihedral-corner-area secondary insulating module and other modules. A double-layer sealed storage carrier for an ultra-low-temperature medium is effectively built, and storage and leakage-prevention problems of the ultra-low-temperature medium are solved.

Description

Installation method of dihedral corner area arrangement structure of membrane type enclosure system

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311521262.8 filed on November 14, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

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

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

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

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

[0007] Summary of the Invention

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

[0009] The present application provides an installation method for a dihedral corner arrangement structure of a film-type containment system. The film-type containment system includes a primary film layer, a fastening plate, a primary insulating layer, a secondary film layer, and a secondary insulating layer, which are sequentially connected and fixed to a hull structure by through-fasteners. The primary film layer, the primary insulating layer, the secondary film layer, and the secondary insulating layer enclose a cryogenic liquid cargo storage tank for accommodating an ultra-low temperature medium. The primary film layer contacts the ultra-low temperature medium. In a corner area where two side surfaces of the film-type containment system intersect, there are a primary dihedral corner area and a secondary dihedral corner area. The installation method includes:

[0010] Installing spacers on the bulkheads of the hull structure according to the set markings and studs for positioning the dihedral area plane transition secondary insulation modules and the spacers on the dihedral area secondary insulation modules in the secondary dihedral area;

[0011] The dihedral angle area planar transition secondary insulation module and the dihedral angle area secondary insulation module are respectively mounted on the distance plate by means of through-fasteners, wherein the studs passing through the distance plate extend into the distance plug holes provided on the bottom of the thermal insulation block and the installation notch groove of the dihedral angle area planar transition secondary insulation module or extend into the distance plug holes provided on the bottom of the step notch groove of the dihedral angle area secondary insulation module;

[0012] After the dihedral corner area planar transition secondary insulation module and the dihedral corner area secondary insulation module are installed, the secondary film layer is installed. The secondary film layer includes a plurality of secondary films of preset sizes connected in a splicing manner. In the corner area where the two side surfaces intersect, the boundary of each secondary film is welded and fixed to the secondary welding plate or secondary welding metal sheet provided on the second top plate of the dihedral corner area planar transition secondary insulation module.

[0013] After completing the installation of the secondary film layer in the corner area where the two side surfaces intersect, the main layer dihedral corner area thermal insulation module is installed, wherein each main layer dihedral corner area thermal insulation module is compressed and connected with the upper parts of the four through-fasteners, and the four through-fasteners provided on the same main layer dihedral corner area thermal insulation module are respectively provided at the four corners of the main layer dihedral corner area thermal insulation module where it is located; at the same corner area, after a main layer dihedral corner area thermal insulation module is installed in place at the same time as another adjacent main layer dihedral corner area thermal insulation module and two main layer insulation layer modules, a pressing block of the corresponding through-fastener is installed at the corner area, and the lower end of the installed pressing block is pressed on the middle plate of the two adjacent main layer dihedral corner area thermal insulation modules and the two main layer insulation layer modules, and the installed pressing block is fixedly connected and locked with the upper end of the cap rod structure of its corresponding through-fastener;

[0014] Install the fastening card plate, which includes a cross card plate and a straight card plate. The middle position of the cross card plate and the middle position of the straight card plate are both provided with a groove for installing the main layer welding metal sheet and a through hole for installing the through fastener. The main layer welding metal sheet is provided with a center hole. The four long edges of the cross card plate and the two long edges of the straight card plate are fixed with main layer welding plates for welding and fixing with the main layer film;

[0015] After the fastening card is installed, the main layer film layer is installed. The main layer film layer includes multiple main layer films with preset sizes connected in a splicing manner. 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 card provided on the main layer insulation module.

[0016] In some embodiments of the present application, before installing the distance plate on the bulkhead of the hull structure according to the set marking line, the method further includes:

[0017] Marking the bulkhead of the hull structure, and welding the welding base of the lower portion of the through-fastener at the position for placing the through-fastener on the bulkhead according to the marking, with nuts pre-installed inside the welding base before welding;

[0018] Install the metal connecting rod that is fixedly connected to the welded base and the through-fastener, and install the distance plate on the stud.

[0019] In some embodiments of the present application, the dihedral area secondary insulation module includes a first bottom plate, a thermal insulation block, and a metal welding plate. The second angle between the two side surfaces of the thermal insulation block away from the first bottom plate is determined according to the angle of the dihedral angle of the hull dihedral area structure, and the second angle ranges from 80 to 160 degrees. The dihedral area secondary insulation module is bonded and fixed to the bulkhead of the hull structure through the first bottom plate. The thermal insulation block has stepped notch grooves formed at the outer edges of the two side surfaces away from the first bottom plate, which are arranged parallel to the straight line at the intersection of the two side surfaces.

[0020] The secondary dihedral angle area planar transition module includes a second top plate, four insulation blocks, a cross reinforcement structure and a second bottom plate. The four insulation blocks are fixed in the space formed by the second top plate, the second bottom plate and the cross reinforcement structure. The cross reinforcement structure is provided with two central support structures. The middle part of the central support structure is provided with a through hole for installing a through fastener. The two insulation blocks at one end of the dihedral angle area planar transition secondary insulation module that contacts the dihedral angle area secondary insulation module are formed with an installation notch groove on one side of the second top plate. The installation notch groove is located on the side close to the secondary dihedral angle area thermal insulation module, and a fixed-distance plunger hole is provided on the installation notch groove.

[0021] In some embodiments of the present application, the metal connecting rod that passes through the fastener is passed through the through hole of the central support structure on the cross reinforcement structure of the dihedral angle area plane transition secondary insulation module, and the cap rod structure that passes through the upper part of the fastener is screwed and fixed to the metal connecting rod and welded to the secondary layer welding metal sheet embedded in the second top plate.

[0022] In some embodiments of the present application, when the secondary insulation module in the dihedral angle area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate, strips of epoxy resin are adhered between the first bottom plate and the side wall of the hull structure at a certain distance, and the height of the epoxy resin between the first bottom plate and the side wall of the hull structure is set to be greater than 12 mm and less than 20 mm according to the distance between the epoxy resins.

[0023] In some embodiments of the present application, a distance plunger hole 54 for the distance installation of the sub-layer dihedral angle area and a distance bolt hole 55 for the distance installation of the sub-layer dihedral angle area are provided on a step plane parallel to the side surface of the step notch groove, and the thermal insulation block is provided with a metal welding plate for welding and fixing to the sub-layer film layer at other positions away from the two sides of the first bottom plate.

[0024] In some embodiments of the present application, the dihedral angle area plane transition secondary insulation module further includes a pressed sheet insulation block and a pressed sheet plate, wherein a welding plate groove and a welding sheet groove are provided on the top of the second top plate, after the secondary layer welding plate and the secondary layer welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surface of the secondary layer welding plate and the upper surface of the secondary layer welding metal sheet are flush with the upper surface of the second top plate, and the secondary layer welding metal sheet is provided with a connection hole for installing a through fastener; the second top plate and the second bottom plate are both provided with a hole connected to the upper surface of the cross reinforcement structure. The installation and fixing hole is set corresponding to the through hole of the central supporting structure, and the installation notch groove is set corresponding to the step notch groove. After the dihedral angle area plane transition secondary insulation module and the dihedral angle area secondary insulation module are fitted together, the bottom of the step notch groove and the bottom of the installation notch groove are bonded and fixed, the pressed sheet insulation block and the pressed sheet plate, the side wall of the step notch groove and the side wall of the installation notch groove are bonded and fixed, the upper part of the pressed sheet insulation block is bonded and fixed to the second top plate, and one dihedral angle area secondary insulation module is set corresponding to two dihedral angle area plane transition secondary insulation modules at the same time.

[0025] In some embodiments of the present application, the boundary of each sub-layer film is welded and fixed to a sub-layer welding plate or a sub-layer welding metal sheet of the second top plate material of the secondary insulation module provided at the dihedral corner plane transition, including:

[0026] Welding the edge of the secondary film adjacent to the dihedral angle area secondary insulation module toward the dihedral angle area secondary insulation module to the metal welding plate, and welding the other edges of the secondary film to the secondary welding plate or the secondary welding metal sheet of the dihedral angle area planar transition secondary insulation module, and laying a thermal protection layer at a position where the boundary of the secondary film does not contact the secondary welding plate and the secondary welding metal sheet;

[0027] First, intermittent spot welding is performed on the position where the sub-layer film contacts the sub-layer welding plate, the position where the sub-layer welding metal sheet contacts, or the position where the sub-layer welding plate contacts. After a whole piece of sub-layer film is welded, the adjacent sub-layer film is overlapped on the previous sub-layer film, and the overlapping edges are continuously welded.

[0028] In some embodiments of the present application, the distance plates are made of plywood or a plastic alternative material that meets the rigidity requirements, and have a thickness of at least one of 1 mm, 2 mm, 5 mm, or 10 mm. The distance plates are used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom of the dihedral angle area planar transition secondary insulation module and the dihedral angle area secondary insulation module and the bulkhead is 10 mm.

[0029] The aperture of the through hole on the distance plate is 0.5-2 mm larger than the outer diameter of the thread on the metal connecting rod.

[0030] In some embodiments of the present application, the through fastener includes: a through fastener upper portion and a through fastener lower portion, wherein:

[0031] The upper portion of the through-fastener includes a cap rod structure, a clamping block, a double-headed screw, and a metal sealing cap. The clamping block is arranged in the installation notches opened on the upper insulation blocks of the two adjacent main layer dihedral area insulation modules and the upper insulation blocks of the two main layer insulation layer modules. The lower portion of the clamping block is in contact with the fixed pad, and the long bolt on the clamping block locks the clamping block.

[0032] The lower section includes a cylindrical welding base and a metal connecting rod with threads at both ends. One end of the metal connecting rod passes through the secondary welding metal sheet and is fixedly connected to the cap rod structure, and the other end is welded and fixed to the hull structure through the set cylindrical welding base. The metal connecting rod is passed through the through hole of the central support structure on the cross reinforcement structure of the dihedral angle area plane transition secondary insulation module.

[0033] In some embodiments of the present application, the main layer dihedral angle zone thermal insulation module includes a first top plate, an upper insulation block, a middle plate and a lower insulation block fixedly connected in sequence, the first top plate includes two rectangular plates arranged at a first angle, the first angle is determined according to the angle of the dihedral angle of the hull dihedral angle zone structure, and the range of the first angle is 80 to 160 degrees, the first top plate is provided with a through-type stress relief groove according to the structure of the main layer film covered thereon, the upper insulation block includes two rectangular insulation blocks arranged at the first angle, the upper insulation block is provided with a non-through-type stress relief groove aligned with the through-type stress relief groove provided on the first top plate, and the upper insulation block is long The square area is larger than the first top plate, and the first top plate is located in the middle of the rectangle of the upper insulation block. The lower insulation block includes two rectangular insulation blocks arranged at a first angle. The middle plate is arranged between the upper insulation block and the lower insulation block. The four vertices of the upper insulation block, the middle plate and the lower insulation block are provided with installation notches for installing through fasteners. The middle plate is provided with fixed pads at the four vertices. The part of the fixed pad in the lower insulation block is adapted to the shape of the installation notch on the lower insulation block. The fixed pad is fixedly connected to the lower insulation block. The bottom of the lower insulation block is provided with an adaptation groove for accommodating the raised structure on the sub-layer film according to the shape and arrangement of the sub-layer film in contact with it.

[0034] In some embodiments of the present application, the first top plate, the middle plate, the second top plate, the cross reinforcement structure, the first bottom plate, and the second bottom plate are all made of a low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can withstand a temperature of at least -196 degrees Celsius and the strength must meet the following requirements, specifically,

[0035] Vertical compression strength is greater than or equal to 4Mpa, bending strength is greater than or equal to 20Mpa, horizontal tensile strength is greater than or equal to 25Mpa, vertical tensile strength is greater than or equal to 1.5Mpa, and shear strength is greater than or equal to 2.5Mpa.

[0036] The upper insulation block, the lower insulation block, the heat-insulating 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;

[0037] The secondary film is made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials that are prefabricated into a set corrugated shape.

[0038] In some embodiments of the present application, the cross reinforcement structure, except for the pressed sheet, has its periphery overlapped with the second top sheet and is connected to the second top sheet by glue or rivets;

[0039] The second bottom plate, except for the pressed plate, has its periphery overlapped with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets;

[0040] The insulation block coincides with the periphery of the second top plate, the second bottom plate and the cross reinforcement structure;

[0041] 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 reinforcement structure;

[0042] The step notch groove and the installation notch groove are fixed by gluing;

[0043] The tableting insulation block is located between the second top plate and the tableting plate;

[0044] The pressed sheet heat-insulating block and the second top plate, and the contact portions between the pressed sheet plate and the heat-insulating block are fixedly connected by glue.

[0045] Compared with the prior art, the beneficial effects of the dihedral corner area structure of the thin film-type enclosure system provided in the embodiment of the present application are: the dihedral corner area main layer insulation layer module and the dihedral corner area secondary layer insulation layer module are staggered, reducing the overall heat leakage at the gap; at the same time, the dihedral corner area secondary layer insulation layer module is bonded to the hull structure with epoxy resin, and the dihedral corner area main layer insulation layer module is connected by a through fastener. Since the through fastener has an elastic compression block, the dihedral corner area main layer insulation layer module and the dihedral corner area secondary layer insulation layer module have relative motion tolerance, and are more stable and capable of absorbing low-temperature deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG1 is a schematic diagram of the arrangement of the trihedral corner area structure of the membrane enclosure system in the installation method of the dihedral corner area arrangement structure of the membrane enclosure system provided in an embodiment of the present application;

[0047] FIG2 is a schematic diagram of the dihedral area structure arrangement of a thin film enclosure system in an installation method of the dihedral area arrangement structure of the thin film enclosure system provided in an embodiment of the present application;

[0048] 3 is a schematic diagram of the arrangement of insulation modules in the dihedral area of ​​a thin film enclosure system in an installation method of the dihedral area arrangement structure of the thin film enclosure system provided in an embodiment of the present application;

[0049] FIG4 is a schematic diagram of the arrangement of dihedral insulation modules in a method for installing a dihedral arrangement structure of a thin film enclosure system according to an embodiment of the present application;

[0050] FIG5 is a schematic diagram of the dihedral angle region insulation module structure in the installation method of the dihedral angle region arrangement structure of the membrane type enclosure system provided in an embodiment of the present application;

[0051] FIG6 is an exploded schematic diagram of the insulation module structure of the dihedral area of ​​the main layer in the installation method of the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application;

[0052] FIG7 is an exploded schematic diagram of a through-fastener in an installation method of a dihedral area arrangement structure of a membrane-type enclosure system according to an embodiment of the present application;

[0053] FIG8 is a schematic diagram of the dihedral sub-layer plane transition module structure in the installation method of the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application;

[0054] FIG9 is an exploded schematic diagram of the dihedral sub-layer plane transition module structure in the installation method of the dihedral area arrangement structure of the membrane-type enclosure system provided in an embodiment of the present application.

[0055] Reference numerals: 1, welding base; 2, nut; 3, metal connecting rod; 3a, threaded cut; 4, secondary welding metal sheet; 10, lower portion of through-fastener; 11, cap rod structure; 19, long bolt; 21, pressing block; 22, stud screw; 23, metal sealing cap; 24, primary welding metal sheet; 25, upper portion of through-fastener; 26, first angle; 27, second 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. Distance plate; 37. Stud; 38. Main welding plate; 39. Low-density flexible insulation material; 40. Slit path; 41. Plunger; 50. Secondary insulation module in dihedral angle area; 50a. Secondary insulation module in 90° dihedral angle area; 50b. Secondary insulation module in 135° dihedral angle area Secondary insulation module; 51, first bottom plate; 52, thermal insulation block; 53, metal welding plate; 54, distance plug hole; 55, distance bolt hole; 56, stepped notch groove; 57, main layer dihedral angle area; 58, secondary layer dihedral angle area; 60, main layer dihedral angle area thermal insulation module; 60a, 90° main layer dihedral angle area thermal insulation module; 60b, 135° main layer dihedral angle area thermal insulation module; 61, upper insulation block; 62, lower insulation block; 63, first top plate; 64, middle Top plate; 65. Fixed pad; 66. Through-type stress relief groove; 67. Non-through-type stress relief groove; 68. Adaptation groove; 69. Notch; 70. Dihedral angle plane transition secondary insulation module; 71. Secondary welding plate; 72. Second top plate; 73. Welding plate groove; 74. Welding plate groove; 75. Pressed sheet insulation block; 76. Insulation block; 77. Cross reinforcement structure; 78. Through hole; 79. Center support structure; 80. Second bottom plate; 81. Pressed sheet plate; 82. Installation notch groove. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0057] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0058] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0059] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0060] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0061] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0062] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0063] The embodiment of the present application provides an installation method for the dihedral area arrangement structure of a membrane type enclosure system. As shown in Figures 1 to 9, the membrane type enclosure system is used to accommodate ultra-low temperature media, including a main layer membrane layer 34, a fastening card plate 35, a main layer insulation layer 33, a secondary membrane layer 32 and a secondary insulation layer 31 that are sequentially connected and fixed to the hull structure (hull steel plate) through a through fastener 28, that is, a main layer insulation layer 33 and a fastening card plate 35 are provided between the main layer membrane layer 34 and the secondary membrane layer 32, and a main layer insulation layer 33 and a fastening card plate 35 are provided between the secondary membrane layer 32 and the hull structure. A secondary insulating layer 31 is provided between the primary film layer 34, the fastening card plate 35, the primary insulating layer 33, the secondary film layer 32 and the secondary insulating layer 31 are all connected and fixed to the hull structure by through-fasteners 28. At the same time, the primary insulating structure and the gap between the primary film layer 34 and the secondary film layer 32 form a primary shielding space, and the secondary insulating structure and the gap between the secondary film layer 32 and the hull structure form a secondary shielding space, effectively building a double-layer sealed ultra-low temperature medium storage carrier, solving the storage and leakage prevention problems of ultra-low temperature media. Specifically,

[0064] Regarding the installation method of the dihedral corner arrangement structure of the above-mentioned membrane-type enclosure system, in the corner area where two side surfaces intersect in the membrane-type enclosure system, including the primary dihedral corner area 57 and the secondary dihedral corner area 58, the installation method includes:

[0065] Mark the bulkhead of the hull structure, and weld the welding base 1 of the lower portion 10 of the through-fastener 28 at the position for placing the through-fastener 28 on the bulkhead according to the marking, and the stud 37 of the distance plate 36 of the dihedral angle area plane transition secondary insulation module 70 and the dihedral angle area secondary insulation module 50 for positioning the secondary dihedral angle area 58. Before welding, the adapter nut 2 is placed inside the welding base 1, and the metal connecting rod 3 of the through-fastener 28 fixedly connected to the welding base 1 is installed, and the stud 37 is fixed on the stud 37. Install a distance plate 36; the four corners of the distance plate are symmetrically arranged about the centerline of the distance plate 36, with four through-holes, each of which is penetrated by a stud 37. The through-fastener comprises an upper through-fastener portion 25 and a lower through-fastener portion 10. The lower through-fastener portion 10 comprises a cylindrical welded base 1 and a metal connecting rod 3 with threads at both ends. The upper through-fastener portion 25 comprises a cap rod structure 11, a clamping block 21, a stud screw 22, and a metal sealing cap 23. The dihedral angle area secondary insulation module 50 comprises a 90° dihedral angle area secondary insulation module 50a and a 135° dihedral angle area secondary insulation module 50b.

[0066] The stud 37 passing through the distance plate 36 extends into the distance plunger hole 54 opened on the bottom of the groove of the insulation block 76 and the installation notch groove 82 of the dihedral angle area plane transition secondary insulation module 70, or extends into the distance plunger hole 54 opened on the bottom of the groove of the stepped notch groove 56 of the dihedral angle area secondary insulation module. Specifically, a dihedral angle area secondary insulation module 50 is equipped with one or two dihedral angle area plane transition secondary insulation modules 70 connected thereto. At the same time, the groove of the stepped notch groove 56 of the dihedral angle area secondary insulation module 50 is provided with a distance plunger hole 54 opened on the bottom of the groove of the stepped notch groove 56 of the dihedral angle area secondary insulation module 50. Four distance plunger holes 54 are opened at the bottom, and one distance plunger hole is opened at each end of the bottom of the installation notch groove 82 of the dihedral angle area plane transition secondary insulation module 70. The dihedral angle area secondary insulation module includes a first bottom plate 51, an insulation block 52 and a metal welding plate 53. The second angle 27 between the two sides of the insulation block 52 away from the first bottom plate 51 is determined according to the dihedral angle of the hull dihedral angle area structure, and the range of the second angle 27 is 80 to 160 degrees. The dihedral angle area secondary insulation module is bonded and fixed to the bulkhead of the hull structure through the first bottom plate 51, and the thermal insulation block 52 is formed with a stepped notch 56 parallel to the straight line intersecting the two side surfaces at the outer edges of the two side surfaces away from the first bottom plate 51; the dihedral angle 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, and the four insulation blocks 76 are fixed in the space formed by the second top plate 72, the second bottom plate 80 and the cross reinforcement structure 77. The cross reinforcement structure 77 is provided with two central support structures 79, and the middle part of the central support structure 79 is provided with a through hole 78 for installing the through fastener 28. The two insulation blocks 76 at the end of the dihedral angle area plane transition secondary insulation module 70 that contacts the dihedral angle area secondary insulation module are formed with an installation notch 82 on one side of the top plate. The installation notch is located on the side close to the dihedral angle area secondary insulation module, and a distance plunger hole 54 is provided on the installation notch.

[0067] Specifically, when the secondary insulation module in the dihedral angle area is bonded and fixed to the bulkhead of the hull structure through the first bottom plate 51, strips of epoxy resin 29 are adhered between the first bottom plate 51 and the side wall of the hull structure at a certain distance. 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 12 mm and less than 20 mm according to the distance between the epoxy resins 29.

[0068] Furthermore, the first bottom plate 51 and the second bottom plate 80 are each provided with an opening concentrically arranged with the through-holes, and the second top plate 72, the thermal insulation block 52, and the thermal insulation block 76 are provided with a spacer plug hole 54 concentrically arranged with the corresponding through-holes and having an aperture 2-4 times the aperture of the corresponding through-hole. This facilitates the use of gaskets, fastening nuts, and tooling to tighten the spacer plates 36. Furthermore, after the four studs 37 provided on each spacer plate 36 are tightened with nuts 2, a plunger 41 made of the same material as the thermal insulation block 76 is used to plug the spacer plug holes 54 provided on each dihedral area secondary insulation module 50 and the dihedral area planar transition secondary insulation module 70, thereby achieving interconnection between each dihedral area secondary insulation module 50 and the dihedral area planar transition secondary insulation module 70 and providing auxiliary anchoring for both the dihedral area secondary insulation module 50 and the dihedral area planar transition secondary insulation module 70.

[0069] The distance plate 36 is made of plywood or a plastic alternative material that meets the stiffness requirements, and the thickness is set to at least one of 1 mm, 2 mm, 5 mm or 10 mm. The distance plate 36 is used for leveling. By stacking and combining distance plates 36 of different thicknesses, the distance between the bottom of the dihedral angle area planar transition secondary insulation module 70 and the dihedral angle area secondary insulation module 50 and the bulkhead is 10 mm; the aperture of the through hole on the distance plate 36 is larger than the outer diameter of the thread on the metal connecting rod 3 by 0.5-2 mm.

[0070] After the dihedral angle area secondary insulation module 50 and the dihedral angle area plane transition secondary insulation module 70 are installed on the distance plate 36, the through fastener 28 is installed, and the metal connecting rod 3 of the through fastener 28 is passed through the through hole 78 of the central support structure 79 on the cross reinforcement structure 77 of the dihedral angle area plane transition secondary insulation module 70, and the cap rod structure 11 of the upper part 25 of the through fastener is screwed and fixed to the threaded cut 3a at the upper end of the metal connecting rod 3 and welded to the secondary layer welding metal sheet 4 embedded in the second top plate 72. At the same time, the use of the distance plate 36, epoxy resin 29 and the lower part 10 of the through fastener can effectively anchor the dihedral angle area secondary insulation module 50 and the dihedral angle area plane transition secondary insulation module 70 of the entire enclosure system to the bulkhead inside the ship.

[0071] After the secondary dihedral area planar transition module 70 and the dihedral area secondary insulation module 50 are installed, the secondary film 32a is installed. The secondary film a is made of invar steel (super-invar alloy) prefabricated into a predetermined corrugated shape. alloy) or 304L stainless steel or other low-temperature resistant metal materials, the sub-layer film layer 32 includes a plurality of sub-layer films 32a with preset sizes connected in a splicing manner, and in the corner area where the two side surfaces intersect, the boundary of each sub-layer film 32a is welded and fixed to the sub-layer welding plate 71 or the sub-layer welding metal sheet 4 of the second top plate 72 provided on the dihedral corner area plane transition sub-insulation module 70. Specifically, since the top of the dihedral corner area sub-insulation module 50 adopts a metal welding plate 53 design in the corner area where the two side surfaces intersect, the metal welding plate 53 is disconnected between the dihedral corner area plane transition sub-insulation modules 70, and the gap is supported by a transition film structure on the corner area steel plate seam, the side of the transition film structure is directly welded to the steel plate of the adjacent corner area module, and the two ends are overlapped and welded to the sub-layer film 32a on the dihedral corner area plane transition sub-insulation module 70, and the contact between the sub-layer film 32a in the plane area and the adjacent metal welding plate 53 in the corner area is directly welded to the metal welding plate 53 to form a seal in the corner area;

[0072] After completing the installation of the secondary film 32a in the corner area where the two side surfaces intersect, the main layer dihedral corner area thermal insulation module 60 of the main layer dihedral corner area 57 is installed, wherein each main layer dihedral corner area thermal insulation module is press-connected with the upper portion 25 of the four through-fasteners, and the four through-fasteners 28 are respectively provided at the four corners of the main layer dihedral corner area thermal insulation module; after the main layer dihedral corner area thermal insulation module 60 and the adjacent other main layer dihedral corner area thermal insulation module 60 and the two main layer insulation modules 33a at the same corner are installed in place, the corresponding pressing block 21 of the through-fastener 28 is installed at the corner, and the pressing block 21 is pressed on the middle plate 64 of the two adjacent main layer dihedral corner area thermal insulation modules 60 and the two main layer insulation modules 33a, and the pressing blocks 21 are respectively fixedly connected to the upper end of the cap rod structure 11 and locked;

[0073] Install the fastening card plate 35, which includes a cross card plate 35a and a straight card plate 35b. The middle position of the cross card plate 35a and the middle position of the straight card plate 35b are both provided with a groove for installing the main layer welding metal sheet 24 and a through hole for installing the through fastener 28, and the main layer welding metal sheet 24 has a center hole. The four long sides of the cross card plate 35a and the two long sides of the straight card plate 35b are fixed with a main layer welding plate 38 for welding and fixing to the main layer film 34a.

[0074] After the fastening card plate 35 is installed, the main layer film layer 34 is installed. The main layer film layer 34 is spliced ​​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 card plate 35 provided on the main layer insulation module 33a.

[0075] In some embodiments of the present application, a spacing plunger hole 54 and a spacing bolt hole 55 for spacing installation in the dihedral angle area of ​​the sub-layer are provided on a step plane in the stepped notch groove that is parallel to the side surface where the stepped notch groove is located. The thermal insulation block 52 is provided with a metal welding plate 53 for welding and fixing to the sub-layer film layer 32 at other positions away from the two sides of the first bottom plate 51.

[0076] Furthermore, in this embodiment, the dihedral angle area plane transition secondary insulation module 70 further includes a secondary layer welding metal sheet 4, a secondary layer welding plate 71, a pressing sheet insulation block 75 and a pressing sheet plate 81, wherein the top of the second top plate 72 is provided with a welding plate groove 74 and a welding plate groove 73. After the secondary layer welding plate 71 and the secondary layer welding metal sheet 4 are respectively installed in the welding plate groove and the welding plate groove, the upper surface of the secondary layer welding plate 71 and the upper surface of the secondary layer welding metal sheet 4 are flush with the upper surface of the second top plate 72, and the secondary layer welding metal sheet 4 is provided with a connection hole for installing a through fastener; the second top plate 72 and the second bottom plate 80 are both provided with a through hole in the central support structure 79 on the cross reinforcement structure 77 78 is a corresponding installation and fixing hole, and the installation notch groove 82 is set corresponding to the step notch groove 56. After the dihedral angle area plane transition secondary insulation module 70 and the dihedral angle area secondary insulation module 50 are fitted together, the bottom of the step notch groove 56 and the bottom of the installation notch groove 82 are bonded and fixed, and the pressed sheet insulation block 75 is bonded and fixed to the pressed sheet plate 81, the side wall of the step notch groove 56 and the side wall of the installation notch groove 82. The gap between the side wall of the step notch groove 56 and the side wall of the installation notch groove 82 is filled with low-density flexible insulation material, the upper part of the pressed sheet insulation block 75 is bonded and fixed to the second top plate 72, and one dihedral angle area secondary insulation module 50 is set corresponding to two dihedral angle area plane transition secondary insulation modules 70 at the same time.

[0077] The boundary of each sub-film layer 32 is welded and fixed to the sub-welding plate 71 or the sub-welding metal sheet 4 provided on the second top plate 72 and the metal welding plate 53 provided on the dihedral area sub-insulation module 50, including:

[0078] The edge of the secondary film 32a adjacent to the dihedral area secondary insulation module 50, which faces the dihedral area secondary insulation module 50, is welded to the metal welding plate 53, and the other edges of the secondary film 32a are welded to the secondary welding plate 71 or the secondary welding metal sheet 4 of the dihedral area planar transition secondary insulation module 70. A thermal 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.

[0079] First, intermittent spot welding is performed on the position where the sub-layer film 32a contacts the sub-layer welding plate 71, the position where the sub-layer welding metal sheet 4 contacts or the position where the sub-layer welding plate 53 contacts. After a whole piece of sub-layer film 32a is welded, the adjacent sub-layer film 32a is overlapped on the previous sub-layer film 32a, and the overlapping edges are continuously welded.

[0080] Furthermore, in this embodiment, the upper portion 25 of the through-fastener includes a cap rod structure 11, a clamping block 21, a double-headed screw 22, and a metal sealing cap 23. The clamping block 21 of the through-fastener upper portion 25 is disposed in the installation notches 69 provided on the upper insulation blocks 61 of two adjacent main layer dihedral area thermal insulation modules 60 and the upper insulation blocks 61 of the two main layer insulation modules 33a. The lower portion 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 through-fastener upper portion 25 locks the clamping block 21.

[0081] One end of the lower metal connecting rod 3 that passes through the lower part 10 of the fastener passes through the secondary welding metal sheet 4 and is fixedly connected to the cap rod structure 11, and the other end is welded and fixed to the hull structure through the set cylindrical welding base 1. The metal connecting rod 3 is passed through the through hole 78 of the central support structure on the cross reinforcement structure 77 of the dihedral angle area plane transition secondary insulation module 70.

[0082] In some embodiments of the present application, the main layer dihedral angle zone insulation module 60 includes a 90° main layer dihedral angle zone insulation module 60a and a 135° main layer dihedral angle zone insulation module 60b, and the main layer dihedral angle zone insulation module includes a first top plate 63, an upper insulation block 61, a middle plate 64 and a lower insulation block 62 fixedly connected in sequence, the first top plate 63 includes two rectangular plates set at a first angle 26, the first angle 26 is determined according to the angle of the dihedral angle of the hull dihedral angle zone structure, and the range of the first angle 26 is 80~160°, the first top plate 63 is provided with a through-type stress release groove 66 according to the structure of the main layer film 34a covering it, the upper insulation block 61 includes two rectangular insulation blocks set at the first angle 26, and the upper insulation block 61 is provided with a through-type stress release groove 66 arranged in alignment with the through-type stress release groove 66 set on the first top plate 63 Non-penetrating stress relief groove 67, the rectangular area of ​​the upper insulation block 61 is larger than the first top plate 63, the first top plate 63 is located in the middle of the rectangle of the upper insulation block 61, the lower insulation block 62 includes two rectangular insulation blocks set at a first angle 26, the middle plate 64 is arranged 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 installation notches 69 for installing the through fasteners 28, the middle plate 64 is provided with fixed pads 65 at the four vertices, the part of the fixed 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 fixed pad 65 is fixedly connected to the lower insulation block 62, and the bottom of the lower insulation block 62 is provided with an adaptation groove 68 for accommodating the raised structure on the sub-layer film 32a according to the shape and arrangement of the sub-layer film 32a in contact with it.

[0083] In some embodiments of the present application, the first top plate 63, the middle plate 64, the second top plate 72, the cross reinforcement structure 77, the first bottom plate 51 and the second bottom plate 80 are all made of a low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can withstand a temperature of at least -196 degrees Celsius and the strength must meet the following requirements, specifically,

[0084] The vertical compressive strength of low-temperature resistant non-metallic materials is greater than or equal to 4Mpa, the bending strength is greater than or equal to 20Mpa, the horizontal tensile strength is greater than or equal to 25Mpa, the vertical tensile strength is greater than or equal to 1.5Mpa, and the shear strength is greater than or equal to 2.5Mpa.

[0085] The upper insulation block 61, the lower insulation block 62, the heat-insulating block 52 and the insulation block 76 are all made of materials that meet the set thermal conductivity requirements, wherein the set thermal conductivity requirements are that the thermal conductivity is not greater than 0.1 W / m·K;

[0086] The secondary film 32a is made of Invar steel or 304L stainless steel or other low-temperature resistant metal material prefabricated into a predetermined corrugated shape.

[0087] In some embodiments of the present application, the connecting gaps between the dihedral corner area structure of the membrane enclosure system and the dihedral corner area plane transition secondary insulation module 70 and the main layer insulation module 33a of the adjacent plane area are arranged in a staggered manner in a horizontal "J"-shaped gap path 40.

[0088] In some embodiments of the present application, the cross reinforcement structure 77, except for the pressing plate 81, overlaps with the second top plate 72 at the rest of the periphery and is connected to the second top plate 72 by glue or rivets;

[0089] The second bottom plate 80, except for the pressing plate 81, has its periphery overlapped 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;

[0090] The insulation block 76 overlaps with the periphery of the second top plate 72 , the second bottom plate 80 , and the cross reinforcement structure 77 ;

[0091] 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 reinforcement structure 77;

[0092] The stepped notch groove 56 and the mounting notch groove 82 are fixed by gluing;

[0093] The tableting insulation block 75 is located between the second top plate 72 and the tableting plate 81;

[0094] The contact points between the pressing plate 75 and the second top plate 72 , the pressing plate 81 and the insulation block 76 are fixedly connected by glue.

[0095] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A method for installing a dihedral area arrangement structure of a membrane type enclosure system, characterized in that: The membrane type containment system comprises a main membrane layer, a fastening card 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, wherein the main membrane layer, the main insulation layer, the secondary membrane layer and the secondary insulation layer enclose a cryogenic liquid cargo storage tank for accommodating ultra-low temperature medium, and the main membrane layer is in contact with the ultra-low temperature medium; In the corner area where two sides of the membrane enclosure system intersect, there are a primary dihedral corner area and a secondary dihedral corner area, and the installation method includes: Installing the distance plates and the studs for positioning the dihedral area plane transition secondary insulation module and the distance plates of the dihedral area secondary insulation module of the secondary dihedral area on the bulkhead of the hull structure according to the set marking line; The dihedral angle area plane transition secondary insulation module and the dihedral angle area secondary insulation module are respectively mounted on the distance plate by means of through-fasteners, wherein the bolts passing through the distance plate extend into the distance plunger holes provided on the insulation block of the dihedral angle area plane transition secondary insulation module and the bottom of the installation notch groove or extend into the distance plunger holes provided on the bottom of the step notch groove of the dihedral angle area secondary insulation module; After the dihedral angle area plane transition secondary insulation module and the dihedral angle area secondary insulation module are installed, the secondary film layer is installed, the secondary film layer includes a plurality of secondary films with preset sizes connected in a splicing manner, and in the corner area where the two side surfaces intersect, the boundary of each secondary film is welded and fixed to the secondary welding plate or secondary welding metal sheet provided on the top plate of the dihedral angle area plane transition secondary insulation module; After completing the installation of the secondary film layer in the corner area where the two side surfaces intersect, the main layer dihedral corner area thermal insulation module of the main layer dihedral corner area is installed, wherein each main layer dihedral corner area thermal insulation module is compressed and connected with the upper parts of the four through-fasteners, and the four through-fasteners arranged on the same main layer dihedral corner area thermal insulation module are respectively arranged at the four corners of the main layer dihedral corner area thermal insulation module where it is located; at the same corner area, after a main layer dihedral corner area thermal insulation module is installed in place at the same time as another adjacent main layer dihedral corner area thermal insulation module and two main layer insulation layer modules, a compression block of the corresponding through-fastener is installed at the corner area, and the lower end of the installed compression block is pressed on the middle plate of the two adjacent main layer dihedral corner area thermal insulation modules and the two main layer insulation layer modules, and the installed compression block is fixedly connected and locked with the upper end of the cap rod structure of the corresponding through-fastener; Install the fastening card plate, the fastening card plate includes a cross card plate and a straight card plate, the middle position of the cross card plate and the middle position of the straight card plate are both provided with a groove for installing the main layer welding metal sheet and a through hole for installing the through fastener, the main layer welding metal sheet is provided with a center hole, and the four long strips of the cross card plate and the two long strips of the straight card plate are fixed with the main layer welding plates for welding and fixing with the main layer film layer; After the fastening card is installed, the main film layer is installed. The main film layer includes a plurality of main films with preset sizes connected in a splicing manner. The boundary of each main film is welded to the main film arranged on the fastening card. The plate or main layer is welded with metal sheets for fixing.

2. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 1 is characterized in that: Before installing the distance plate on the bulkhead of the hull structure according to the set marking line, the method further includes: Marking a bulkhead of the hull structure, and welding a welding base of a lower portion of the through-fastener at a position for placing the through-fastener on the bulkhead according to the marking, wherein a nut is pre-placed inside the welding base before welding; A metal connecting rod that is fixedly connected to the welding base and penetrates the fastener is installed, and a distance plate is installed on the stud.

3. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 2 is characterized in that: The dihedral area secondary insulation module comprises a first bottom plate, a heat insulation block and a metal welding plate, the second angle between the two side surfaces of the heat insulation block away from the first bottom plate is determined according to the angle of the dihedral angle of the dihedral area structure of the hull, and the range of the second angle is 80-160°, the dihedral area secondary insulation module is bonded and fixed to the bulkhead of the hull structure through the first bottom plate, and the heat insulation block is formed with a stepped notch groove arranged parallel to the straight line at the intersection of the two side surfaces at the outer edges of the two side surfaces away from the first bottom plate; The sub-layer dihedral angle area planar transition module includes a second top plate, four insulation blocks, a cross reinforcement structure and a second bottom plate. The four insulation blocks are fixed in a space formed by the second top plate, the second bottom plate and the cross reinforcement structure. The cross reinforcement structure is provided with two central support structures. A through hole for installing a through fastener is provided in the middle of the central support structure. Two insulation blocks at one end of the dihedral angle area planar transition secondary insulation module in contact with the dihedral angle area secondary insulation module are formed with an installation notch groove on one side of the second top plate. The installation notch groove is located close to the side of the sub-layer dihedral angle area thermal insulation module, and a fixed-distance plunger hole is provided on the installation notch groove.

4. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 3 is characterized in that: The metal connecting rod of the through-fastener is inserted into the through hole of the central supporting structure on the cross reinforcement structure of the plane transition secondary insulation module in the dihedral angle area, 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 layer welding metal sheet embedded in the second top plate.

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

6. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 5 is characterized in that: The stepped notch groove is provided with a distance plunger hole for the distance installation of the secondary dihedral angle area and a distance bolt hole for the distance installation of the secondary dihedral angle area on a step plane parallel to the side where the stepped notch groove is located. The heat insulation block is provided with a metal plate for welding and fixing with the secondary film layer at other positions away from the two sides of the first bottom plate. It is a welded plate.

7. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 6 is characterized in that: The dihedral angle area plane transition secondary insulation module also includes a pressed sheet insulation block and a pressed sheet plate, wherein the top of the second top plate is provided with a welding plate groove and a welding sheet groove, after the secondary layer welding plate and the secondary layer welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surface of the secondary layer welding plate and the upper surface of the secondary layer welding metal sheet are flush with the upper surface of the second top plate, and the secondary layer welding metal sheet is provided with a connecting hole for installing a through fastener; the second top plate and the second bottom plate are both provided with a central support structure connected to the cross reinforcement structure The through hole is correspondingly provided with an installation fixing hole, and the installation notch groove is correspondingly provided with the step notch groove. After the dihedral angle area plane transition secondary insulation module and the dihedral angle area secondary insulation module are fitted and provided, the bottom of the step notch groove and the bottom of the installation notch groove are bonded and fixed, the pressing sheet insulation block is bonded and fixed with the pressing sheet plate, the side wall of the step notch groove and the side wall of the installation notch groove, the upper part of the pressing sheet insulation block is bonded and fixed with the second top plate, and one dihedral angle area secondary insulation module is provided corresponding to two dihedral angle area plane transition secondary insulation modules at the same time.

8. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 7 is characterized in that: The method of welding and fixing the boundary of each sub-layer film to the sub-layer welding plate or the sub-layer welding metal sheet of the second top plate material of the plane transition sub-insulation module in the dihedral angle area comprises: The edge of the secondary film adjacent to the dihedral angle area secondary insulation module facing the dihedral angle area 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 the secondary welding metal sheet of the dihedral angle area plane transition secondary insulation module, and a thermal protection layer is laid at a 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 position where the sub-layer film contacts the sub-layer welding plate, the position where the sub-layer welding metal sheet contacts, or the position where the sub-layer welding plate contacts. After a whole piece of sub-layer film is welded, the adjacent sub-layer film is overlapped on the previous sub-layer film, and the overlapping edges are continuously welded.

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

10. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 9, characterized in that: The through-fastener comprises: an upper portion of the through-fastener and a lower portion of the through-fastener, wherein the upper portion of the through-fastener comprises a cap rod structure, a clamping block, a double-headed screw and a metal sealing cap, wherein the clamping block is arranged in the installation notches opened on the upper insulation blocks of the two adjacent main layer dihedral area thermal insulation modules and the upper insulation blocks of the two main layer insulation layer modules, the lower portion of the clamping block is fitted with the fixed pad, and the long bolt on the clamping block locks the clamping block; The lower section of the through-fastener includes a cylindrical welding base and a metal connecting rod with threads at both ends, one end of which passes through the secondary welding metal sheet and is fixedly connected to the cap rod structure, and the other end is welded and fixed to the hull structure through a set cylindrical welding base. The metal connecting rod is inserted into the through hole of the central supporting structure on the cross reinforcement structure of the planar transition secondary insulation module in the dihedral angle area.

11. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 10, characterized in that: The main layer dihedral area thermal 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 angle, the first angle is determined according to the angle of the dihedral angle of the dihedral area structure of the hull, and the range of the first angle is 80 to 160 degrees, the first top plate is provided with a through-type stress release groove according to the structure of the main layer film layer covering it, the upper insulation block includes two rectangular insulation blocks arranged at a first angle, the upper insulation block is provided with a non-through-type stress release groove which is arranged in alignment with the through-type stress release groove arranged on the first top plate, and the rectangular area of ​​the upper insulation block is larger than that of the first top plate Material, the first top plate is located in the middle of the rectangle of the upper insulation block, the lower insulation block includes two rectangular insulation blocks arranged at a first angle, the middle plate is arranged between the upper insulation block and the lower insulation block, the four vertices of the upper insulation block, the middle plate and the lower insulation block are all provided with installation notches for installing through fasteners, the middle plate is provided with fixed pads at the four vertices, the part of the fixed pad in the lower insulation block is adapted to the shape of the installation notch on the lower insulation block, the fixed pad is fixedly connected to the lower insulation block, and the bottom of the lower insulation block is provided with an adaptation groove for accommodating a raised structure on the sub-layer film according to the shape and arrangement of the sub-layer film in contact with it.

12. The installation method of the dihedral 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 reinforcement structure, the first bottom plate and the second bottom plate are all made of low-temperature resistant non-metallic material with a set strength, wherein the low-temperature resistant non-metallic material can at least withstand a temperature of minus 196 degrees Celsius, and the strength must meet the following requirements, specifically, Vertical compression strength is greater than or equal to 4Mpa, bending strength is greater than or equal to 20Mpa, horizontal tensile strength is greater than or equal to 25Mpa, vertical tensile strength is greater than or equal to 1.5Mpa, and shear strength is greater than or equal to 2.5Mpa; The upper insulation block, the lower insulation block, the heat 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 film layer is made of Invar steel or 304L stainless steel or other low-temperature resistant metal material prefabricated into a set corrugated shape.

13. The installation method of the dihedral area arrangement structure of the membrane type enclosure system according to claim 12, characterized in that: The cross reinforcement structure, except for the pressed sheet, overlaps with the second top sheet at the rest of the periphery and is connected to the second top sheet by glue or rivets; The second bottom plate, except for the pressed plate, has its periphery overlapped with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets; The heat-insulating block overlaps with the second top plate, the second bottom plate and the periphery of the cross reinforcement structure; The insulation block is connected and fixed with glue at the contact points with the second top plate, the second bottom plate and the cross reinforcement structure; The step notch groove and the installation notch groove are fixed by gluing; The tabletting insulation block is located between the second top plate and the tabletting plate; The contact points between the pressed sheet heat-insulating block and the second top plate, and between the pressed sheet plate and the heat-insulating block are fixedly connected by glue.

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