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

Abstract

Provided is a mounting method for a trihedral-corner-area arrangement structure of a thin-film-type enclosure system. The thin-film-type enclosure system comprises a main-layer thin film layer (34), a fastening attachment plate (35), a main-layer insulating layer (33), a secondary-layer thin film layer (32) and a secondary-layer insulating layer (31), which are sequentially connected and fixed to a ship body structure by means of penetrating fasteners (28), wherein the main-layer thin film layer (34), the main-layer insulating layer (33), the secondary-layer thin film layer (32) and the secondary-layer insulating layer (31) enclose a low-temperature liquid cargo storage tank for accommodating an ultra-low temperature medium, and the main-layer thin film layer (34) is in contact with the ultra-low temperature medium; and a corner area where three side faces intersect with each other comprises a trihedral-corner-area main-layer insulating layer module (101), a trihedral-corner-area secondary-layer insulating layer module (102) and a trihedral-corner-area secondary-layer planar transition insulating module (90). The mounting method comprises: according to set scribe lines, mounting spacer plates (36) and positioning studs (37) on a cabin wall surface of the ship body structure; and then mounting the penetrating fasteners (28), the trihedral-corner-area secondary-layer insulating layer module (102), the trihedral-corner-area secondary-layer planar transition insulating module (90) and other modules, respectively.

Description

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

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311518204.X 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 trihedral corner 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] The existing membrane containment system technologies 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, since its main and secondary insulation modules are arranged in an overlapping manner, the gaps between the main insulation modules and the gaps between the secondary insulation modules are directly connected to the hull structure. Although insulation materials such as glass wool are evenly distributed in the gaps, there is still a large amount of heat leakage in the gaps. For the Mark III, since the main insulation modules, secondary insulation modules and secondary membranes are fixed to each other with glue and fixed to the hull structure with epoxy resin, the relative movement between the main and secondary insulation modules is restricted, and the overall resistance to hull movement and liquid cargo sloshing is poor. In addition, the large amount of glue used 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 of a three-sided corner area 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 through through-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 through-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 trihedral corner arrangement structure of a film-type enclosure system. The film-type enclosure system includes a main film layer, a fastening card plate, a main film layer, a secondary film layer, and a secondary insulation layer, which are sequentially connected and fixed to the hull structure by through-fasteners. The main film layer, the main insulation layer, the secondary film layer, and the secondary insulation layer enclose a low-temperature liquid cargo storage tank for accommodating ultra-low temperature media, and the main film layer is in contact with the ultra-low temperature media. In the corner area where three sides of the film-type enclosure system intersect, there are a trihedral corner area main layer insulation layer module, a trihedral corner area secondary layer insulation layer module, and a trihedral corner area secondary layer plane transition insulation module. The installation method includes:

[0010] Installing distance plates and studs for positioning the trihedral angle area sub-layer insulation module and the trihedral angle area sub-layer plane transition insulation module on the cabin wall surface of the hull structure according to the set markings, wherein the trihedral angle area sub-layer plane transition insulation module is provided with distance bolt holes for passing the studs at corner areas other than the corner area on the side where it connects with the trihedral angle area sub-layer insulation module;

[0011] The trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition 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 trihedral angle area sub-layer plane transition insulation module;

[0012] After the trihedral angle area sub-layer insulation layer module is installed at the trihedral angle area of ​​the hull structure and bonded and fixed, the through fasteners are installed to complete the installation of the trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition insulation module;

[0013] Installing a secondary membrane layer, the secondary membrane layer comprising a plurality of secondary membranes of predetermined dimensions connected in a splicing manner, wherein the secondary membrane layer is provided with a secondary corner membrane head in a corner area where three sides intersect, and the secondary corner membrane head is seal-welded to the metal welding plate of the secondary insulation layer module in the three-sided corner area, so that the secondary membrane provided on the secondary insulation layer module in the flat area can overlap the secondary corner membrane head to form a complete and sealed secondary membrane;

[0014] After the installation of the secondary film layer is completed, the main insulating layer modules of the trihedral corner area are installed, wherein the main insulating layer modules of the trihedral corner area are all compressed and fixed to the adjacent main insulating layer modules of the plane area or the main insulating layer modules of the dihedral corner area by the compression blocks of the upper parts of the through-fasteners. The main insulating layer modules of the trihedral corner area are equipped with four through-fasteners for compression connection, and the four through-fasteners equipped with the main insulating layer modules of the trihedral corner area are respectively arranged at the four corners of the main insulating layer modules of the trihedral corner area;

[0015] After the trihedral angle area main layer insulation layer module and the adjacent dihedral angle area main layer insulation layer module and the plane area main layer insulation layer module at the same corner are installed in place, a corresponding pressing block of the penetrating fastener is installed in the corner area, and the bottom metal plate of the pressing block is simultaneously pressed on the fixed pad fixedly set with the middle plate of the trihedral angle area main layer insulation layer module, the fixed pad fixedly set with the middle plate of the dihedral angle area main layer insulation layer module, and the fixed pad fixedly set with the middle plate of the plane area main layer insulation layer module, and is fixedly connected to the upper end of the metal connecting rod penetrating the fastener and locked;

[0016] The main layer film layer is installed in the corner area where the three side surfaces intersect. The main layer film layer adopts the transition film full coverage method. Three main layer corner area transition films that are respectively arranged parallel to the three upper surfaces of the three main layer insulation layer modules in the three-sided corner area and are arranged at an angle to each other are overlapped and welded to each other, and 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 provided on the corner area transition card plate. Before overlap welding, a main layer corner area transition film is spot welded to the main layer welding plate on the corner area transition card plate, and then the other two overlapping main layer corner area transition films are welded in sequence.

[0017] In some embodiments of the present application, before installing the distance plate on the cabin wall surface of the hull structure according to the set marking line, the method further includes:

[0018] Marking a line on the cabin wall of the hull structure, and welding a welding base of the lower portion of the through-fastener at a position for placing the through-fastener on the cabin wall according to the marked line, with nuts pre-placed inside the welding base before welding;

[0019] Weld the studs of the distance plate connecting the trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition insulation module, install the metal connecting rod that is fixedly connected to the welding base and penetrates the fastener, and then install the distance plate on the studs.

[0020] In some embodiments of the present application, the trihedral angle area sub-layer insulation layer module includes three sub-layer insulation surface structures corresponding to the three cabin side surfaces of the trihedral angle area of ​​the hull structure and bonded and fixed thereto. The angle between any two of the three sub-layer insulation surface structures is determined based on the angle between the two corresponding cabin side surfaces in the hull structure. Each trihedral angle area sub-layer insulation layer module is composed of a three-layer structure, including a first bottom plate, a thermal insulation block, and a metal welding plate bonded and fixed in sequence inwardly from the cabin wall surface. The thermal insulation block in each trihedral angle area sub-layer insulation layer module is formed with an inwardly concave stepped notch groove on the upper edge of the side connected to the trihedral angle area sub-layer plane transition insulation module.

[0021] The trihedral angle area sub-layer plane transition insulation module includes a second top plate, four insulation blocks, a cross reinforcement structure, four central support structures and a second bottom plate. The four insulation blocks are respectively arranged in four spaces formed by the cross reinforcement structure between the second top plate and the second bottom plate, and the four corners of the space where the rectangular insulation blocks connected to the trihedral angle area sub-layer insulation layer module are located are provided with installation and fixing holes for installing through fasteners. The trihedral angle area sub-layer plane transition insulation module is formed with an inwardly concave installation notch groove corresponding to the step notch groove on the upper edge of the side connected to the thermal insulation block. When the trihedral angle area sub-layer plane transition insulation module is connected to the thermal insulation block, it is bonded and fixed by the step notch groove and the pressing plate on the top of the installation notch groove.

[0022] In some embodiments of the present application, installing a through fastener includes:

[0023] The metal connecting rod of the through-fastener is passed through the through holes of the four central support structures provided on the secondary plane transition insulation module in the trihedral angle 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 thread of the metal connecting rod and welded to the secondary welding metal sheet embedded in the second top plate.

[0024] In some embodiments of the present application, the gap at the connection position between the main layer insulation layer module in the trihedral corner area and the main layer insulation layer module in the planar area and the gap at the connection position between the secondary layer insulation layer module in the trihedral corner area and the secondary layer plane transition insulation module in the trihedral corner area are in different planes.

[0025] In some embodiments of the present application, the width dimension of each of the three main layer insulation surface structures of the trihedral angle area main layer insulation layer module is greater than the width dimension of the secondary layer insulation surface structures respectively arranged corresponding to the three main layer insulation surface structures in the trihedral angle area secondary layer insulation layer module.

[0026] In some embodiments of the present application, a distance plug hole for installing a distance plate for the trihedral angle area secondary layer plane transition insulation module is provided on a step plane in the stepped notch groove that is parallel to the side of the cabin where the stepped notch groove is located and at one end away from the main layer insulation layer module of the trihedral angle area.

[0027] In some embodiments of the present application, the trihedral angle area sub-layer plane transition insulation module also includes a sub-layer welding metal sheet, a sub-layer welding plate, a pressed sheet insulation block and a pressed sheet plate, wherein a welding plate groove and a welding plate groove are provided on the top of the second top plate. After the sub-layer welding plate and the sub-layer welding metal sheet are installed in the welding plate groove and the welding plate groove respectively, the upper surface of the sub-layer welding plate and the upper surface of the sub-layer welding metal sheet are flush with the upper surface of the second top plate, and the sub-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 installation and fixing holes corresponding to the through holes of the central support structure on the cross reinforcement structure, and the installation notch groove is corresponding to the step notch groove. When the trihedral angle area sub-layer insulation layer module is connected to the trihedral angle area sub-layer plane transition insulation module, the step notch groove is bonded and fixed to the bottom pressed sheet plate of the installation notch groove, the pressed sheet insulation block is bonded and fixed to the pressed sheet plate, the side walls of the step notch groove and the side walls of the installation notch groove, and the upper part of the pressed sheet insulation block is bonded and fixed to the second top plate.

[0028] In some embodiments of the present application, when the secondary planar transition insulation module in the trihedral angle region is bonded and fixed to the cabin wall surface of the hull structure through the second bottom plate, a strip of epoxy resin is adhered between the second bottom plate and the side wall of the hull structure, 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 12 mm and less than 20 mm according to the distance between the epoxy resins;

[0029] The distance plates are made of plywood or plastic alternative materials that meet the rigidity requirements, and are set to at least one of 1mm, 2mm, 5mm or 10mm in thickness. The distance plates are used for leveling. By stacking and combining distance plates of different thicknesses, the distance between the bottom of the trihedral corner area sub-layer planar transition insulation module and the trihedral corner area sub-layer insulation layer module and the cabin wall is 10mm.

[0030] The diameter of the through hole on the distance plate is 0.5-2 mm larger than the outer diameter of the thread on the stud.

[0031] In some embodiments of the present application, the through fastener includes: a through fastener upper portion and a through fastener lower portion, wherein:

[0032] 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 trihedral angle area main layer insulation layer module and the adjacent plane area main layer insulation layer module and dihedral area main layer insulation layer module. The metal plate at the bottom of the clamping block fits with the fixed pad, and the long bolt on the clamping block locks the clamping block.

[0033] The lower part of the through-fastener includes a cylindrical welding base and a metal connecting rod with threads at both ends. One end of the metal connecting rod passes through the sub-layer 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 welding base. The metal connecting rod is inserted into the through hole of the central support structure on the sub-layer planar transition insulation module in the trihedral angle area.

[0034] In some embodiments of the present application, the three-hedral angle area main layer insulation layer module includes three main layer insulation surface structures corresponding to the three cabin sides of the three-hedral angle area of ​​the hull structure and bonded and fixed. The angle between any two of the three main layer insulation surface structures is determined based on the angle between the corresponding two cabin sides in the hull structure. Each three-hedral angle area main layer insulation layer module is composed of four layers, including a first top plate, an upper insulation block, a middle plate and a lower insulation block bonded and fixed in sequence from the inner side away from the cabin wall to the side close to the cabin wall. The three-hedral angle area main layer insulation layer module is provided with installation notches at the corners connected to the dihedral angle area main insulation layer module. Each installation notch is provided with a fixed pad fixed to the middle plate and adapted to the shape of the installation notch at the lower insulation block part.

[0035] In some embodiments of the present application, the first top plate, the middle plate, the first bottom plate, the second top plate, the cross reinforcement 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,

[0036] 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.

[0037] 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;

[0038] The main film of the main film layer and the secondary film of the secondary film layer are both made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials prefabricated into a set corrugated shape.

[0039] 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;

[0040] The outer periphery of the second bottom plate, excluding the pressed plate, overlaps with the cross reinforcement structure and the second top plate, and is connected to the cross reinforcement structure by glue or rivets;

[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 pressed sheet is located at the bottom of the installation notch and is bonded and fixed to the adjacent insulation block by glue. The pressed sheet extends out of the second bottom sheet in the direction of the ship cabin wall parallel to the pressed sheet near the secondary insulation layer module in the trihedral angle area.

[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 trihedral corner area structure of the thin film-type enclosure system provided in the embodiment of the present application are: the trihedral corner area main layer insulation layer module and the trihedral corner area secondary layer insulation layer module are staggered, reducing the overall heat leakage at the gap; at the same time, the trihedral corner area secondary layer insulation layer module is bonded to the hull structure with epoxy resin, and the trihedral corner area main layer insulation layer module is connected by a through fastener. Since the through fastener has an elastic compression block, the trihedral corner area main layer insulation layer module and the trihedral corner area secondary layer insulation layer module have relative motion tolerance. 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 trihedral corner area arrangement structure of the membrane enclosure system provided in an embodiment of the present application;

[0047] FIG2 is a cross-sectional schematic diagram of the arrangement of the trihedral corner area structure of the membrane enclosure system in the installation method of the trihedral corner area arrangement structure of the membrane enclosure system provided in an embodiment of the present application;

[0048] FIG3 is a schematic diagram of a transition structure of a trihedral corner area in an installation method of a trihedral corner area arrangement structure of a membrane-type enclosure system according to an embodiment of the present application;

[0049] FIG4 is a schematic diagram of the arrangement of trihedral corner area modules in a hull structure in the installation method of the trihedral corner area arrangement structure of the membrane-type containment system provided in an embodiment of the present application;

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

[0051] FIG6 is a schematic diagram of an exploded view of a trihedral corner area insulation module structure in an installation method of a trihedral corner area arrangement structure of a membrane-type enclosure system according to an embodiment of the present application;

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

[0053] FIG8 is a schematic diagram of a trihedral corner area secondary layer planar transition insulation module structure in an installation method of a trihedral corner area arrangement structure of a thin film enclosure system according to an embodiment of the present application;

[0054] FIG9 is an exploded schematic diagram of a trihedral corner area secondary layer planar transition insulation module structure in an installation method of a trihedral corner area arrangement structure of a thin film enclosure system according to an embodiment of the present application;

[0055] FIG10 is a schematic diagram of the installation of a secondary insulating layer and a secondary thin film layer in the installation method of the trihedral corner arrangement structure of the thin film enclosure system provided in an embodiment of the present application;

[0056] FIG11 is a schematic diagram of the installation of the main insulation layer in the installation method of the trihedral corner area arrangement structure of the membrane-type enclosure system provided by an embodiment of the present application;

[0057] FIG12 is a schematic diagram of the installation of the main thin film layer in the installation method of the three-sided corner area arrangement structure of the thin film type enclosure system provided in an embodiment of the present application.

[0058] Reference numerals 1, welding base; 2, nut; 3, metal connecting rod; 4, secondary welding metal sheet; 10, lower section of through-fastener; 11, cap rod structure; 12, bottom metal plate; 19, long bolt; 21, pressing block; 22, stud screw; 23, metal sealing cap; 24, primary welding 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, plane area secondary insulation layer module; 32, Secondary film layer; 32a, secondary film; 33, main insulating layer; 33a, plane area main insulating layer module; 34, main film layer; 34a, main film; 35, fastening card; 35c, corner area transition card; 36, distance plate; 37, stud; 38, main layer welding plate; 48, main layer insulating surface structure; 49, secondary insulating surface structure; 50, dihedral angle area secondary insulating layer module; 50a, 90° dihedral angle area secondary insulating layer module; 50b, 135° dihedral angle area secondary insulating layer module; 51, first bottom plate ; 52. Insulation block; 53. Metal welding plate; 54. Distance plunger hole; 55. Distance bolt hole; 56. Step notch groove; 60. Main insulation layer module in dihedral area; 60a. Main insulation layer module in 90° dihedral area; 60b. Main insulation layer module in 135° dihedral area; 61. Upper insulation block; 62. Lower insulation block; 63. First top plate; 64. Middle plate; 65. Fixed pad; 69. Installation notch; 70. Plane transition secondary insulation layer module in dihedral area; 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, central support structure; 80, second bottom plate; 81, pressed sheet plate; 82, installation notch groove; 84, main layer corner area transition film; 85, secondary layer corner area film head; 90, trihedral corner area secondary layer plane transition insulation module; 100, trihedral corner area module; 101, trihedral corner area main layer insulation layer module; 102, trihedral corner area secondary layer insulation layer module; DETAILED DESCRIPTION

[0059] 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.

[0060] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The embodiment of the present application provides an installation method for the trihedral angle arrangement structure of a film-type enclosure system, as shown in Figures 1 to 12, wherein the film-type enclosure system includes a main film layer 34, a fastening card plate 35, a main layer insulation layer 33, a secondary film layer 32 and a secondary insulation layer 31 that are sequentially connected and fixed to the hull structure 26 through a through fastener 28, the main film layer 34, the main layer insulation layer 33, the secondary film layer 32 and the secondary insulation layer 31 enclose a low-temperature liquid cargo storage tank for accommodating ultra-low temperature media, the main film layer 34 and the ultra-low temperature media are connected to the main film layer 34 and the ultra-low temperature media. Material contact, specifically, by arranging a main layer insulation layer 33 and a fastening card plate 35 between the main layer film layer 34 and the secondary layer film layer 32, and arranging a secondary layer insulation layer 31 between the secondary layer film layer 32 and the hull structure 26, and then the main layer insulation structure and the gap between the main layer film layer 34 and the secondary layer film layer 32 form a main layer shielding space, and the secondary layer insulation structure and the gap between the secondary layer film layer 32 and the hull structure 26 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.

[0067] In the film-type enclosure system, a trihedral corner module 100 is provided in each corner area where three sides intersect. The trihedral corner module 100 includes a trihedral corner primary 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:

[0068] Mark the cabin wall surface 27 of the hull structure 26, and then 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 cabin wall surface according to the marking. The nut 2 needs to be embedded in the welding base 1 before the welding operation, and then weld the stud 37 of the distance plate 36 connecting the trihedral angle area sub-layer insulation layer module 102 and the trihedral angle area sub-layer plane transition insulation module 90. Of course, in the actual operation process, it is also necessary to weld the through fastener 31a of the plane area sub-layer insulation layer module 31a on the cabin wall surface 27 according to the marking. The welding base 1 of the lower section 10 of the fastener and the corresponding stud 37; wherein, the four corners of the distance plate 36 are symmetrically arranged about the center line of the distance plate 36 with four through holes, and a stud 37 is passed through each through hole; the through fastener 28 includes a through fastener upper section 25 and a through fastener lower section 10, the through fastener lower section 10 includes a cylindrical welding base 1 and a metal connecting rod 3 with threads at both ends, and the through fastener upper section 25 includes a cap rod structure 11, a clamping block 21, a double-headed screw 22 and a metal sealing cap 23.

[0069] After the studs 37 and the welding base 1 are installed, the metal connecting rods 3 that pass through the fasteners 28 and are fixedly connected to the welding base 1, as well as the installation distance plates 36 on the studs are installed. Of course, in the actual operation process, it can be based on the actual situation on site. For example, after all the metal connecting rods 3 that pass through the fasteners 28 are installed, it may affect the installation of the trihedral corner area sub-layer insulation layer module 102. In this case, the metal connecting rods that pass through the fasteners 28 can be installed later, or only part of the metal connecting rods 3 that pass through the fasteners 28 can be installed, thereby achieving the goal of not affecting the installation of the trihedral corner area sub-layer insulation layer module 102. Among them, the trihedral corner area sub-layer planar transition insulation module 90 is provided with distance plug holes 54 for passing the studs 37 in other corner areas except the corner area on one side connected to the trihedral corner area sub-layer insulation layer module 102, and is then connected to the plane area sub-layer insulation layer module 31a and the dihedral corner area planar transition sub-layer insulation layer module 70 through the distance plates 36.

[0070] After the distance plate 36 is sleeved on the stud 37, the stud passing through the distance plate 36 is extended into the distance plug hole 54 opened on the trihedral angle area sub-layer plane transition insulation module, wherein the trihedral angle area sub-layer insulation layer module 102 includes three sub-layer insulation surface structures 49 corresponding to the three cabin sides of the trihedral angle area of ​​the hull structure 26 and bonded and fixed. The angle between any two of the three sub-layer insulation surface structures 49 is determined based on the angle between the corresponding two cabin sides in the hull structure 26. For example, if the angle between the two cabin sides is 9 0 degrees, the angle between the two sub-layer insulation surface structures corresponding to the two cabin sides can be 90 degrees, and accordingly, the 90° dihedral angle area sub-insulating layer module 50a can be shown in FIG1 ; of course, it can also be between 85 degrees and 95 degrees. For example, if the angle between the two cabin sides is 135 degrees, the angle between the two sub-layer insulation surface structures 49 corresponding to the two cabin sides can be 135 degrees, and accordingly, the 135° dihedral angle area sub-insulating layer module 50b can be shown in FIG1 ; of course, it can also be between 130 degrees and 140 degrees, that is, the trihedral angle area sub-insulating layer module The angle between any two faces 102 can have an angle difference within a certain range from the angle between the corresponding two cabin sides. Each trihedral angle area sub-layer insulation layer module 102 is composed of a three-layer structure, including a first bottom plate 51, a heat insulation block 52 and a metal welding plate 53 that are sequentially bonded and fixed inward from the cabin wall 27. The heat insulation block 52 in each trihedral angle area sub-layer insulation layer module 102 is formed with an inwardly concave stepped notch groove 56 on the upper edge of the side connected to the trihedral angle area sub-layer plane transition insulation module 90. The block 90 has an inwardly recessed installation notch 82 formed on the upper edge of the side connected to the thermal insulation block 52 and arranged corresponding to the stepped notch 56. When the trihedral angle area sub-layer plane transition insulation module 90 is connected to the thermal insulation block 52, it is bonded and fixed by the stepped notch 56 and the pressing plate 81 on the top of the installation notch 82. A distance plunger hole 54 for installing the distance plate 36 of the trihedral angle area sub-layer plane transition insulation module 90 is provided on a step plane in the stepped notch 56 parallel to the side of the cabin where the stepped notch 56 is located and at one end away from the trihedral angle area main layer insulation layer module 101.

[0071] Furthermore, the trihedral angle area sub-layer planar transition insulation module 90 includes a second top plate 72, four insulation blocks 76, a cross reinforcement structure 77, four central support structures 79 and a second bottom plate 80. The four insulation blocks are respectively arranged in the four spaces formed by the cross reinforcement structure 77 between the second top plate 72 and the second bottom plate 80, and the middle part of the four central support structures 79 is provided with a through hole 78 for installing the through fastener 28.

[0072] In this embodiment, the second bottom plate 80 is further provided with a distance bolt hole 55 which 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 which is concentrically arranged with the corresponding through hole and has a hole diameter of 2-4 times the hole diameter of the corresponding through hole, thereby facilitating the gasket, fastening nut and tooling tool to lock the distance plate 36. Furthermore, after the four studs 37 passing through each distance plate 36 are tightened by the nuts 2, the distance plug holes 54 opened on each trihedral angle area sub-layer plane transition insulation module are filled with a plunger made of the same material as the insulation block, so that each trihedral angle area sub-layer plane transition insulation module 90 can be interconnected with the adjacent plane area sub-layer insulation layer module 31a or with the dihedral angle area sub-layer insulation layer module 50, and it plays an auxiliary anchoring role for the trihedral angle area sub-layer plane transition insulation module 90 and the adjacent dihedral angle area plane transition sub-layer insulation layer module 70 or with the dihedral angle area sub-layer insulation layer module 50.

[0073] Furthermore, 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 1mm, 2mm, 5mm or 10mm. 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 trihedral angle area sub-layer plane transition insulation module, the adjacent dihedral angle area plane transition sub-layer insulation layer module 70 or the adjacent dihedral angle area sub-insulation layer module 50 and the cabin wall 27 is 10mm; the aperture of the through hole on the distance plate 36 is larger than the outer diameter of the thread on the nut 2 by 0.5-2mm.

[0074] After completing the installation of the studs 37 and installing the trihedral angle area sub-layer insulation layer module 102 in the trihedral angle area of ​​the hull structure 26 and bonding it, the through-fasteners 28 are installed, and the metal connecting rods 3 of the through-fasteners 28 are passed through the through holes 78 of the four central support structures 79 provided on the trihedral angle area sub-layer plane transition insulation module 90, and the cap rod structure 11 of the through-fastener upper section 25 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.

[0075] In this embodiment, one of the four central support structures 79 is located at the center of the cross of the cross reinforcement structure 77, two are located at the extended ends of two adjacent vertical plates in the cross of the cross reinforcement structure 77, and the other is arranged in a rectangular shape with the three central support structures 79 and is located at the end of the rectangle closest to the main insulating layer module 101 in the trihedral angle area. The four central support structures 79 can be formed by structural components directly fixedly connected to the cross reinforcement structure 77 or by structural components directly fixedly connected to the second bottom plate 80 of the secondary planar transition insulating module 90 in the trihedral angle area.

[0076] After the trihedral angle area sub-layer insulation layer module 102 and the trihedral angle area sub-layer planar transition insulation module 90 are installed, the sub-layer film layer 32 is installed. Of course, in the actual operation process, before installing the sub-layer film layer 32, the dihedral angle area sub-layer insulation layer module 50 and the dihedral angle area planar transition sub-layer insulation layer module 70 will be installed first, and at the same time, the planar area sub-layer insulation layer module 31a will be installed to form a complete sub-layer insulation layer, and then the sub-layer film layer 32 will be installed.

[0077] 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 into a set corrugated shape, and the secondary film layer may include a plurality of secondary films 32a with preset sizes connected in a splicing manner. Specifically, in the corner area where the three sides intersect, the secondary film layer is provided with a secondary corner film head 85, and the secondary corner film head 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 31a provided in the plane area The secondary film 32a on the upper portion can be overlapped on the secondary film seal 85 in the corner area to form a complete and sealed secondary film layer 32 in the corner area, and then the secondary film 32a on the secondary insulating layer module 31a in the plane area can be installed in sequence. Similarly, for the corner area where two side surfaces intersect, the same method can be used to first complete the sealing welding and fixing of the edge of the secondary film 32a on the secondary insulating layer module in the two-sided corner area, and then complete the installation of the secondary film 32a on the secondary insulating layer module 31a in the plane area, and finally form a complete secondary film layer 32;

[0078] After completing the installation of the secondary film layer 32, the trihedral angle area main layer insulation layer module 101 of the main layer trihedral angle area is installed, wherein the trihedral angle area main layer insulation layer module 101 is compressed and fixed with the adjacent plane area main layer insulation layer module 33a or the dihedral angle area main layer insulation layer module 60 by the compression block 21 of the upper part 25 of the penetrating fastener. The dihedral angle area main layer insulation layer module 60 includes a 90° dihedral angle area main insulation layer module 60a and a 135° dihedral angle area main insulation layer module 60b. The trihedral angle area main layer insulation layer module 101 is equipped with four penetrating fasteners 28 for compression connection. The four penetrating fasteners 28 are respectively provided at the four corners of the trihedral angle area main layer insulation layer module 101;

[0079] After the trihedral angle area main layer insulation layer module 101 and the adjacent dihedral angle area main layer insulation layer module 60 and the plane area main layer insulation layer module 33a at the same corner are installed in place, a corresponding pressing block 21 with a penetrating fastener 28 is installed in the corner area, and the bottom metal plate 12 of the pressing block 21 is simultaneously pressed on the fixed pad 65 fixedly provided with the middle plate 64 of the trihedral angle area main layer insulation layer module 101, the fixed pad 65 fixedly provided with the middle plate 64 of the dihedral angle area main layer insulation layer module, and the fixed pad 65 fixedly provided with the middle plate 64 of the main layer insulation, and is fixedly connected to the upper end of the metal connecting rod 3 and locked. The dihedral angle area main insulation layer module 60 includes a 90° dihedral angle area main insulation layer module 60a and a 135° dihedral angle area main insulation layer module 60b;

[0080] In this embodiment, the trihedral angle area main layer insulation layer module 101 includes three main layer insulation surface structures 48 corresponding to the three cabin sides of the trihedral angle area of ​​the hull structure 26 and bonded and fixed thereto. The angle between any two of the three main layer insulation surface structures 48 is determined based on the angle between the corresponding two cabin sides in the hull structure 26. Each trihedral angle area main layer insulation layer module 101 is composed of a four-layer structure, including a first top plate 63, an upper insulation block 61, a middle plate 64 and a lower insulation block 62 bonded and fixed in sequence from the inner side away from the cabin wall 27 to the side close to the cabin wall 27. The trihedral angle area main layer insulation layer module 101 is provided with installation notches 69 at the corners connected to the dihedral angle area main insulation layer module 60. Each installation notch 69 is provided with a fixing pad 65 fixed to the middle plate 64 and adapted to the shape of the installation notch 69 at the lower insulation block 62.

[0081] In this embodiment, each of the three cabin sides in the trihedral angle area of ​​the hull structure 26 is perpendicularly arranged to at least one fixed pad 65, and the fixed pad 65 is flush with the side of the lower insulation block 62 away from the middle plate 64.

[0082] After the main insulating layer module 101 in the trihedral angle area is installed, the main thin film layer 34 is installed. Of course, in the actual operation process, before installing the main thin film layer, the dihedral angle area secondary insulating layer module 50 and the dihedral angle area planar transition secondary insulating layer module 70 will be installed first, and at the same time, the planar area secondary insulating layer module 31a will be installed to form a complete main insulating layer 33, and then the main thin film layer 34 will be installed.

[0083] In this embodiment, the main film layer 34 is made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials prefabricated into a set corrugated shape. When installing the main film layer 34 in the corner area where the three sides intersect, the main film layer 34 adopts a transition film full coverage method. Three main layer corner area transition films 84 are respectively arranged parallel to the three upper surfaces of the three main layer insulation layer modules 101 in the three-sided corner area and are arranged at an angle to each other, and are overlapped and welded 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 provided on the corner area transition card plate 35c. Before overlap welding, a main layer corner area transition film 84 is spot welded to The main layer welding plate 38 on the corner transition card plate 35c is welded in sequence with the other two overlapping main layer corner transition films 84. After that, the main layer film 34a on the plane area main layer insulation layer module 33a is overlapped on the main layer corner transition film 84, and the overlapping edges are continuously welded, and the operation is cyclical to form a complete and sealed three-sided corner area main layer film layer 34. Similarly, for the corner area where two side surfaces intersect, the same method can be used to first complete the sealing welding and fixation of the edge of the main layer corner transition film 84 on the two-sided corner area main insulation layer module 60, and then complete the installation of the main layer film layer on the main insulation module in the plane area, and finally form a complete main layer film layer 34.

[0084] In some embodiments of the present application, the gap at the connection position between the trihedral angle area main layer insulation layer module 101 and the plane area main layer insulation layer module 33a and the gap at the connection position between the trihedral angle area secondary layer insulation layer module 102 and the trihedral angle area secondary layer plane transition insulation module 90 are in different planes. As an example, in the trihedral angle area, in the direction of the three liquid cargo tank edges between the three cabin sides corresponding to the trihedral angle area main layer insulation layer module 101, the length of the trihedral angle area main layer insulation layer module 101 on each edge is shorter than that of the trihedral angle area secondary layer insulation layer module 102, thereby ensuring that the gap between the trihedral angle area secondary insulation module and the adjacent dihedral angle area secondary insulation module and the gap between the trihedral angle area main insulation module and the adjacent dihedral angle area main insulation module do not overlap.

[0085] At the same time, in this embodiment, the width dimension of each of the three main layer insulating surface structures 48 of the three-hedral angle area main layer insulating layer module 101 is greater than the width dimension of the secondary layer insulating surface structure 49 in the three-hedral angle area secondary layer insulating layer module 102 that is respectively arranged corresponding to the three main layer insulating surface structures 48.

[0086] Furthermore, in this embodiment, the trihedral angle area sub-layer plane transition insulation module 90 further includes a sub-layer welding metal sheet 4, a sub-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 sheet groove 73. After the sub-layer welding plate 71 and the sub-layer welding metal sheet 4 are installed in the welding plate groove and the welding sheet groove respectively, the upper surface of the sub-layer welding plate 71 and the upper surface of the sub-layer welding metal sheet 4 are flush with the upper surface of the second top plate 72, and the sub-layer welding metal sheet 4 is provided with a connection hole for installing the through fastener 28; the second top plate 72 The second bottom plate 80 is provided with installation and fixing holes corresponding to the through holes 78 of the central support structure 79 on the cross reinforcement structure 77, and the installation notch groove 82 is arranged corresponding to the step notch groove 56. When the trihedral angle area sub-layer insulation layer module 102 is connected to the trihedral angle area sub-layer plane transition insulation module 90, the step notch groove 56 is bonded and fixed to the bottom pressing plate 81 of the installation notch groove 82, the pressing insulation block 75 is bonded and fixed to the pressing plate 81, the side wall of the step notch groove 56 and the side wall of the installation notch groove 82, and the upper part of the pressing insulation block 75 is bonded and fixed to the second top plate 72.

[0087] In addition, in some embodiments of the present application, when the sub-layer planar transition insulation module 90 in the trihedral angle area is bonded and fixed to the cabin wall 27 of the hull structure 26 through the second bottom plate 80, strips of epoxy resin 29 are adhered at intervals between the second bottom plate 80 and the side wall of the hull structure 26, and 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 interval between the epoxy resins 29.

[0088] In some embodiments of the present application, the upper portion 25 of the through-fastener includes a lower end cap rod structure 11, a clamping block 21, a double-headed screw 22, and a metal sealing cap 23. The clamping block 21 is disposed in the mounting notch 82 provided on the trihedral angle main layer insulation layer module 101 and the adjacent planar area main layer insulation layer module 33a and the dihedral area main insulation layer module 60. The bottom metal plate 12 of the clamping block 21 is in contact with the fixing pad 65, and the long bolt 19 on the clamping block 21 locks the clamping block 21.

[0089] The lower section 10 of the through fastener includes a cylindrical welding base 1 and a metal connecting rod 3 with threads at both ends, one end of which passes through the sub-layer 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 26 through the set welding base 1. The metal connecting rod 3 is inserted into the through hole 78 of the central support structure 79 on the sub-layer planar transition insulation module 90 in the trihedral angle area.

[0090] In some embodiments of the present application, the first top plate 63, the middle plate 64, the first bottom plate 51, the second top plate 72, the cross reinforcement structure 77 and the second bottom plate 80 are all made of low-temperature resistant non-metallic materials with set strength, wherein the low-temperature resistant non-metallic materials can at least withstand temperatures of minus 196 degrees Celsius. Specifically, the vertical compression strength of the low-temperature resistant non-metallic material 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.

[0091] The heat-insulating block 52, the upper heat-insulating block 61, the lower heat-insulating block 62 and the heat-insulating 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;

[0092] The primary film 34a and the secondary film 32a are both made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials that are prefabricated into a predetermined corrugated shape.

[0093] In some embodiments of the present application, the cross reinforcement structure 77 overlaps with the second top plate 72 at the periphery except for the pressing plate 81 and is connected to the second top plate 72 by glue or rivets;

[0094] 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;

[0095] 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;

[0096] The pressed sheet material 81 is located at the bottom of the installation notch and is bonded to the adjacent insulation block 76 by glue. The pressed sheet material 81 extends out of the second bottom plate 80 in the direction of the ship cabin wall 27 parallel to the pressed sheet material 81 near the secondary insulation layer module 102 in the trihedral angle area.

[0097] The tableting insulation block 75 is located between the second top plate 72 and the tableting plate 81;

[0098] 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.

[0099] 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 trihedral corner area arrangement structure of a membrane type enclosure system, characterized in that: The film-type enclosure system comprises a main film layer, a fastening card plate, a main film layer, a secondary film layer and a secondary film layer which are sequentially connected and fixed to the hull structure by penetrating fasteners, wherein the main film layer, the main film layer, the secondary film layer and the secondary film layer enclose a low-temperature liquid cargo storage tank for accommodating ultra-low temperature medium, and the main film layer is in contact with the ultra-low temperature medium; in the corner area where three sides of the film-type enclosure system intersect, a trihedral angle area main layer insulation layer module, a trihedral angle area secondary layer insulation layer module and a trihedral angle area secondary layer plane transition insulation module are included, and the installation method comprises: Installing distance plates and studs for positioning the trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition insulation module on the cabin wall surface of the hull structure according to set marking lines, wherein the trihedral angle area sub-layer plane transition insulation module is provided with distance bolt holes for passing studs at other corner areas except the corner area on one side where the trihedral angle area sub-layer insulation layer module is connected; The trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition 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 trihedral angle area sub-layer plane transition insulation module; After the trihedral angle area sub-layer insulation layer module is installed at the trihedral angle area of ​​the hull structure and bonded and fixed, a through fastener is installed to complete the installation of the trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition insulation module; Installing a secondary film layer, the secondary film layer comprising a plurality of secondary films of preset sizes connected in a splicing manner, the secondary film layer being provided with a secondary corner film head in a corner area where three sides intersect, and being sealed and welded to a metal welding plate of a secondary insulating layer module in a three-sided corner area through the secondary corner film head, so that the secondary film provided on the secondary insulating layer module in the plane area can overlap on the secondary corner film head to form a complete and sealed secondary film; After completing the installation of the secondary film layer, the main insulating layer module of the trihedral angle area is installed, wherein the main insulating layer module of the trihedral angle area is fixed to the adjacent main insulating layer module or the main insulating layer module of the dihedral angle area by a pressing block through the upper part of the fastener, and the main insulating layer module of the trihedral angle area is equipped with four through fasteners for compression connection, and the four through fasteners equipped with the main insulating layer module of the trihedral angle area are respectively arranged at the four corners of the main insulating layer module of the trihedral angle area; After the main insulating layer module of the trihedral angle area and the adjacent main insulating layer module of the dihedral angle area and the main insulating layer module of the plane area are installed in place, a corresponding clamping block of the through-fastener is installed in the corner area, and the bottom metal plate of the clamping block is simultaneously pressed on the fixed pad fixedly arranged with the middle plate of the main insulating layer module of the trihedral angle area, the fixed pad fixedly arranged with the middle plate of the main insulating layer module of the dihedral angle area, and the fixed pad fixedly arranged with the middle plate of the main insulating layer module of the plane area. The fixed pad is fixedly connected to the upper end of the metal connecting rod penetrating the fastener and locked; The main layer film layer is installed in the corner area where three side surfaces intersect. The main layer film layer adopts a transition film full coverage method. Three main layer corner area transition films that are respectively arranged parallel to the three upper surfaces of the three main layer insulation layer modules in the three-sided corner area and are arranged at an angle to each other are overlapped and welded to be fixed to each other, and 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 provided on the corner area transition card plate. Before overlap welding, a main layer corner area transition film is spot welded to the main layer welding plate on the corner area transition card plate, and then the other two overlapping main layer corner area transition films are welded in sequence.

2. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 1 is characterized in that: Before installing the distance plate on the cabin wall surface of the hull structure according to the set marking line, the method further includes: Marking a line on the cabin wall of the hull structure, and welding a welding base of the lower portion of the through fastener at a position for placing the through fastener on the cabin wall according to the marking line, wherein a nut is pre-placed inside the welding base before welding; Weld the studs of the distance plate connecting the trihedral angle area sub-layer insulation layer module and the trihedral angle area sub-layer plane transition insulation module, install the metal connecting rod that penetrates the fastener and is fixedly connected to the welding base, and then install the distance plate on the studs.

3. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 2 is characterized in that: The trihedral angle area sub-layer insulation layer module includes three sub-layer insulation surface structures which correspond to the three cabin sides of the trihedral angle area of ​​the hull structure and are bonded and fixed. The angle between any two of the three sub-layer insulation surface structures is determined based on the angle between the two corresponding cabin sides in the hull structure. Each trihedral angle area sub-layer insulation layer module is composed of three-layer structures, which respectively include a first bottom plate, a heat insulation block and a metal welding plate which are bonded and fixed inwardly from the cabin wall surface in sequence. The heat insulation block in each trihedral angle area sub-layer insulation layer module is formed with an inwardly concave stepped notch groove on the upper edge of the side connected to the trihedral angle area sub-layer plane transition insulation module. The trihedral angle area sub-layer plane transition insulation module includes a second top plate, four insulation blocks, a cross reinforcement structure, four central support structures and a second bottom plate. The four insulation blocks are respectively arranged in four spaces formed by the cross reinforcement structure between the second top plate and the second bottom plate, and the four corners of the space where the rectangular insulation blocks connected to the trihedral angle area sub-layer insulation layer module are located are provided with installation and fixing holes for installing through fasteners. The trihedral angle area sub-layer plane transition insulation module is formed with an inwardly recessed installation notch groove corresponding to the step notch groove on the upper edge of the side connected to the thermal insulation block. When the trihedral angle area sub-layer plane transition insulation module is connected to the thermal insulation block, it is bonded and fixed by the step notch groove and the pressing plate at the top of the installation notch groove.

4. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 3 is characterized in that: The installation penetration fastener comprises: The metal connecting rod that penetrates the fastener is inserted into the through holes of the four central support structures set on the secondary plane transition insulation module in the trihedral angle area, and the cap rod structure that penetrates the upper part of the 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 trihedral angle area arrangement structure of the membrane type enclosure system according to claim 4 is characterized in that: The gap at the connection position between the trihedral angle area main layer insulation layer module and the plane area main layer insulation layer module and the gap at the connection position between the trihedral angle area secondary layer insulation layer module and the trihedral angle area secondary layer plane transition insulation module are in different planes.

6. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 5 is characterized in that: The width dimension of each of the three main insulating surface structures of the main insulating layer module in the trihedral angle area is greater than the width dimension of the secondary insulating surface structures in the trihedral angle area secondary insulating layer module respectively arranged corresponding to the three main insulating surface structures.

7. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 6 is characterized in that: A distance plunger hole for installing a distance plate of a trihedral angle area secondary plane transition insulation module is provided in the stepped notch groove on a step plane parallel to the cabin side where the stepped notch groove is located and at one end away from the trihedral angle area main layer insulation layer module.

8. The method for installing the trihedral angle arrangement structure of the membrane type enclosure system according to claim 7, characterized in that: The trihedral angle area sub-layer plane transition insulation module also includes a sub-layer welding metal sheet, a sub-layer welding plate, 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 sub-layer welding plate and the welding metal sheet are respectively installed in the welding plate groove and the welding sheet groove, the upper surface of the sub-layer welding plate and the upper surface of the sub-layer welding metal sheet are flush with the upper surface of the second top plate, and the sub-layer welding metal sheet is provided with a connecting hole for installing a through fastener; the second top plate and the second bottom plate The materials are provided with installation and fixing holes corresponding to the through holes of the central supporting structure on the cross reinforcement structure, the installation notch groove is arranged corresponding to the step notch groove, when the trihedral angle area sub-layer insulation layer module is connected with the trihedral angle area sub-layer plane transition insulation module, the step notch groove is bonded and fixed to the bottom pressing plate of the installation notch groove, the pressing sheet insulation block is bonded and fixed to the pressing sheet plate, the side wall of the step notch groove and the side wall of the installation notch groove, and the upper part of the pressing sheet insulation block is bonded and fixed to the second top plate.

9. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 8 is characterized in that: The secondary plane transition insulation module in the trihedral angle area is connected to the cabin wall of the hull structure through the second bottom plate. During surface bonding and fixing, a strip of epoxy resin is adhered between the second bottom plate and the side wall of the hull structure, 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 12 mm and less than 20 mm according to the distance between the epoxy resins; 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 trihedral angle area sub-layer plane transition insulation module and the trihedral angle area sub-layer insulation layer module and the cabin wall is 10mm; The diameter of the through hole on the distance plate is 0.5-2 mm larger than the outer diameter of the thread on the stud.

10. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 9, characterized in that: The through fastener comprises: a through fastener upper section and a through fastener lower section, wherein: The upper section of the through fastener includes a cap rod structure, a clamping block, a double-headed screw and a metal sealing cap, wherein the clamping block is arranged in the installation notches opened on the main insulating layer module of the trihedral angle area and the adjacent main insulating layer module of the plane area and the main insulating layer module of the dihedral angle area, the metal plate at the bottom of the clamping block is fitted with the fixed pad, and the long bolt on the clamping block is used to lock 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 sub-layer 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 welding base. The metal connecting rod is inserted into the through hole of the central support structure on the sub-layer planar transition insulation module in the trihedral angle area.

11. The installation method of the trihedral angle area arrangement structure of the membrane type enclosure system according to claim 10, characterized in that: The main layer insulation layer module in the three-hedral angle area includes three main layer insulation surface structures which correspond to the three cabin sides in the three-hedral angle area of ​​the hull structure and are bonded and fixed. The angle between any two of the three main layer insulation surface structures is determined based on the angle between the two corresponding cabin sides in the hull structure. Each main layer insulation layer module in the three-hedral angle area is composed of four layers, which respectively include a first top plate, an upper insulation block, a middle plate and a lower insulation block which are bonded and fixed in sequence from the inner side away from the cabin wall to the side close to the cabin wall. The main layer insulation layer module in the three-hedral angle area is provided with installation notches at the corners connected to the main insulation layer module in the dihedral angle area. Each of the installation notches is provided with a fixing pad fixed to the middle plate and adapted to the shape of the installation notch in the lower insulation block.

12. The installation method of the trihedral angle 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 reinforcement 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 minus 196 degrees Celsius; the strength needs to 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 heat insulation block, the upper insulation block, the lower 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 main film of the main film layer and the secondary film of the secondary film layer are both made of Invar steel or 304L stainless steel or other low-temperature resistant metal materials prefabricated into a set corrugated shape.

13. The installation method of the trihedral angle 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 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 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 pressed sheet is located at the bottom of the installation notch and is bonded and fixed to the adjacent insulation block by glue. The pressed sheet extends out of the second bottom sheet in the direction of the ship cabin wall parallel to the pressed sheet near the secondary insulation layer module in the trihedral angle area; 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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