A transverse ring insulation box structure for the LNG ship containment system and its installation method

Abstract

The present invention discloses a transverse ring insulation box structure of an LNG ship containment system and an installation method thereof. The insulation box structure is arranged in a transition area between the transverse ring Invar pipe area and the planar area of the containment system. The insulation box structure includes a transverse ring secondary layer insulation box and a transverse ring main layer insulation box with a right trapezoidal cross-section, and the included angle of the cross-section is equal to the included angle between the ship's transverse bulkhead and longitudinal bulkhead. By designing a special insulation box to replace the traditional combined insulation structure of a rectangular insulation box and other insulation materials, the present invention not only simplifies the composition and installation process flow of the containment system, but also improves the construction efficiency of the containment system.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly relates to a transverse ring insulation box structure of an LNG ship's containment system and an installation method thereof. Background Art

[0002] The cargo containment system is the core of an LNG carrier. The thin-film containment system is one of the most widely used containment system types at present. It consists of two similar insulation layers, which are respectively called the secondary layer and the primary layer. According to the load-bearing capacity of the cargo containment system, large and medium-sized LNG carriers are generally divided into four cargo holds, which are numbered 1, 2, 3, and 4 from the bow to the stern in sequence. Among them, holds 2, 3, and 4 are octagonal prism-shaped, and hold 1 is located at the bow of the ship. Affected by the hull line shape, it is octagonal pyramid-shaped. Due to its octagonal pyramid shape, non-90-degree angles will be formed between the top surface (bow transverse bulkhead) and the bottom surface (stern transverse bulkhead) and some side surfaces (longitudinal bulkheads). For the non-90-degree angle area formed by the stern transverse bulkhead and the longitudinal bulkhead, that is, the 74.48 and 78.89 angle areas, the conventional method is to install ordinary cuboid insulation boxes in this area, and then install other insulation materials (generally rigid PVC foam insulation) in the triangular area formed between the cuboid insulation box and the transverse ring Invar, so as to install this area completely and achieve effective thermal insulation and load-bearing functions. This not only increases the types of insulation materials, but also increases the installation steps and affects the installation efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a transverse ring insulation box structure of an LNG ship's containment system and an installation method thereof to solve the problems existing in the above background art.

[0004] A transverse ring insulation box structure of an LNG ship's containment system, the insulation box structure is arranged in the transition area between the transverse ring Invar pipe area and the plane area of the containment system. The insulation box structure includes a transverse ring secondary layer insulation box and a transverse ring primary layer insulation box with a right trapezoidal cross-section, and the included angle of the cross-section is equal to the included angle between the ship's transverse bulkhead and the longitudinal bulkhead;

[0005] The transverse ring secondary layer insulation box is arranged on the ship's transverse bulkhead or longitudinal bulkhead through a first resin layer and is fixed to its adjacent secondary layer flat box as a whole through a connecting rod mechanism. A secondary layer Invar film is arranged on the upper end surface of the secondary layer insulation structure formed by the transverse ring secondary layer insulation box and its adjacent secondary layer flat box. A transverse ring primary layer insulation box and a primary layer flat box are arranged on the secondary layer Invar film. The right-angle surface of the transverse ring primary layer insulation box is aligned with the right-angle surface of the transverse ring secondary layer insulation box and is fixed to its adjacent primary layer flat box as a whole through a fixing mechanism. The fixing mechanism passes through the secondary layer Invar film and is fixed to the connecting rod mechanism;

[0006] Insulating materials are filled in the gaps between the transverse annular secondary-layer insulating box and the adjacent secondary-layer flat box, and between the transverse annular main-layer insulating box and the adjacent main-layer flat box.

[0007] Preferably, grooves are provided on the surfaces of the transverse annular secondary-layer insulating box and the transverse annular main-layer insulating box that are adjacent to the transverse annular Invar tube region, for facilitating the gas circulation in the insulating layer to ensure pressure balance.

[0008] Preferably, process holes are provided on both end faces of the transverse annular secondary-layer insulating box and the transverse annular main-layer insulating box, for facilitating the gas circulation in the insulating layer to ensure pressure balance.

[0009] Preferably, the transverse annular secondary-layer insulating box and the transverse annular main-layer insulating box are both of hexahedron structure, and the lengths of the upper short side and the lower long side of their respective cross-sections are determined according to the dimensions at their installation positions, and the height of the cross-section is determined according to the flat box and the thickness of the insulating layer at their installation positions.

[0010] Preferably, the included angle between the transverse bulkhead and the longitudinal bulkhead of the hull is 74.48° or 78.89°.

[0011] Preferably, the linkage mechanism includes a lower mounting plate, a wooden wedge block, an upper mounting plate and a connecting rod. The lower mounting plate presses on the feet of the transverse annular secondary-layer insulating box and the secondary-layer flat box. The wooden wedge block is arranged on the lower mounting plate through a second resin layer. The upper mounting plate is arranged on the wooden wedge block. The lower mounting plate, the wooden wedge block and the upper mounting plate are connected into one body through multiple groups of fasteners. A first mounting hole is provided in the center of the lower mounting plate, a second mounting hole is provided in the center of the wooden wedge block, and a third mounting hole is provided in the center of the upper mounting plate. One end of the connecting rod is threadedly fixed in the base between the feet of the transverse annular secondary-layer insulating box and the secondary-layer flat box, and the other end passes through the first mounting hole and is limited in the second mounting hole through an elastic locking assembly. The lower end of the fixing mechanism is threadedly fixed in the third mounting hole.

[0012] Preferably, the elastic locking assembly includes a locking nut, a locking plate and a spring washer. The locking nut and the locking plate are sleeved on the connecting rod. The body of the locking nut extends into the first mounting hole, and the nut head contacts the locking plate. The locking plate is welded and fixed to the connecting rod. The spring washer is sleeved on the body of the locking nut, and one end of it abuts and is fixed to the nut head of the locking nut, and the other end abuts and is fixed to the upper surface of the lower mounting plate.

[0013] Preferably, the fixing mechanism includes a fixing plate, a fixing stud and a spring washer. The fixing plate presses on the feet of the transverse annular main-layer insulating box and the main-layer flat box. The fixing stud passes through the center of the fixing plate and is locked and fixed by a self-locking nut arranged on it. The lower end of the fixing stud is threadedly fixed in the third mounting hole. The spring washer is arranged between the self-locking nut and the fixing plate.

[0014] Preferably, plywood is also provided at the top of the transverse ring secondary layer insulation box and / or at the bottom of the transverse ring main layer insulation box.

[0015] An installation method for the transverse ring insulation box structure of the LNG ship containment system described above specifically includes the following steps:

[0016] S1. Install the transverse ring secondary layer insulation box in the transition area between the transverse ring Invar pipe area and the plane area of the containment system. The cross-section of the transverse ring secondary layer insulation box is a right trapezoid, and the included angle of the cross-section is equal to the included angle between the ship's transverse bulkhead and longitudinal bulkhead. A layer of the first resin layer is provided between the transverse ring secondary layer insulation box and the ship's transverse bulkhead or longitudinal bulkhead.

[0017] S2. Fix the transverse ring secondary layer insulation box and its adjacent secondary layer flat box into one body by using a linkage mechanism.

[0018] S3. Lay the secondary layer Invar film on the upper end surface of the secondary layer insulation structure formed by the transverse ring secondary layer insulation box and its adjacent secondary layer flat box, and then make holes in the secondary layer Invar film.

[0019] S4. Place the transverse ring main layer insulation box with a cross-section being a right trapezoid and the included angle of the cross-section being equal to the included angle between the ship's transverse bulkhead and longitudinal bulkhead on the secondary layer Invar film, and align the right-angle surface of the transverse ring main layer insulation box with the right-angle surface of the transverse ring secondary layer insulation box. Then fix it into one body with its adjacent main layer flat box through a fixing mechanism. The lower end of the fixing mechanism passes through the hole in the secondary layer Invar film and is fixed to the linkage mechanism.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. By designing a special insulation box to replace the traditional combined insulation structure of a rectangular insulation box and other insulation materials, the present invention not only simplifies the composition and installation process flow of the containment system, but also improves the construction efficiency of the containment system.

[0022] 2. The present invention designs the transverse ring secondary layer insulation box and the transverse ring main layer insulation box into a structural form with a cross-section being a right trapezoid and the included angle of the cross-section being equal to the included angle between the ship's transverse bulkhead and longitudinal bulkhead, which can make the inclined surfaces of the transverse ring secondary layer insulation box and the transverse ring main layer insulation box fit with the transverse ring Invar pipe area, and the vertical surfaces are parallel to the respective adjacent flat boxes, thus improving the installation accuracy and installation efficiency of the insulation box.

[0023] 3. The transverse annular secondary layer insulation box of the present invention is fixed integrally with the adjacent secondary layer flat box through a linkage mechanism, and the transverse annular main layer insulation box is fixed integrally with the adjacent main layer flat box through a fixing mechanism. Both the linkage mechanism and the fixing mechanism can withstand the vertical movement generated in the liquid cargo hold during ship shipping, effectively ensuring the integrity of the insulation layer of the enclosure system and also reducing the liquid cargo evaporation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic diagram of the installation position of the insulation box structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the cross-section of the transverse annular secondary layer insulation box.

[0027] Figure 3 It is the front view of the transverse annular secondary layer insulation box.

[0028] Figure 4 It is a schematic diagram of the cross-section of the transverse annular main layer insulation box.

[0029] Figure 5 It is the front view of the transverse annular main layer insulation box.

[0030] Figure 6 For Figure 1 The enlarged view of position A in

[0031] The meanings of the reference numerals in the figure are as follows:

[0032] 1 is the transverse annular secondary layer insulation box, 2 is the transverse annular main layer insulation box, 3 is the secondary layer flat box, 4 is the main layer flat box, 5 is the transverse annular Invar tube area, 6 is the transverse bulkhead, 7 is the longitudinal bulkhead, 8 is the first resin layer, 9 is the second resin layer, 10 is the lower mounting plate, 11 is the wooden wedge block, 12 is the upper mounting plate, 13 is the connecting rod, 14 is the support foot of the transverse annular secondary layer insulation box, 15 is the support foot of the secondary layer flat box, 16 is the support foot of the transverse annular main layer insulation box, 17 is the support foot of the main layer flat box, 18 is the fastener, 19 is the first mounting hole, 20 is the second mounting hole, 21 is the third mounting hole, 22 is the base, 23 is the lock nut, 24 is the lock plate, 25 is the spring washer, 26 is the secondary layer Invar film, 27 is the fixing plate, 28 is the fixing stud, 29 is the spring washer, 30 is the self-locking nut, 31 is the insulating material, 32 is the plywood, 33 is the groove, 34 is the process hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0035] The following will further describe the present application in detail through specific embodiments in conjunction with the accompanying drawings.

[0036] In the description of the present application, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of this specification, it should be understood that the orientation terms such as "upper", "lower", "left", "right", etc. described in the embodiments of the present application are described from the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0038] The present invention provides a transverse ring insulation box structure for the LNG ship containment system. The insulation box structure is arranged in the transition area between the transverse ring Invar pipe area 5 and the plane area of the containment system. The transverse ring Invar pipe area 5 includes transverse ring Invar pipes and the insulation boxes installed below and inside them. The insulation box structure includes a transverse ring secondary layer insulation box 1 and a transverse ring main layer insulation box 2 with a right trapezoidal cross-section, and the included angle of the cross-section is equal to the included angle between the transverse bulkhead and the longitudinal bulkhead of the ship.

[0039] Both the transverse ring secondary layer insulation box 1 and the transverse ring main layer insulation box 2 are hexahedron structures, and the lengths of the upper short side and the lower long side of their respective cross-sections are determined according to the dimensions at their installation positions, and the height of the cross-section is determined according to the plane box and the insulation layer thickness at their installation positions.

[0040] The included angle between the transverse hull bulkhead 6 and the longitudinal bulkhead 7 is 74.48° or 78.89°. Therefore, the acute angles of the right trapezoids of the cross-sections of the transverse annular secondary layer insulation box 1 and the transverse annular main layer insulation box 2 are designed as 74.48° or 78.89° according to their installation positions.

[0041] The transverse annular secondary layer insulation box 1 is installed in the secondary insulation layer of the enclosure system, and the transverse annular main layer insulation box 2 is installed in the main insulation layer of the enclosure system.

[0042] Specifically, the transverse annular secondary layer insulation box 1 is arranged on the transverse hull bulkhead 6 or the longitudinal bulkhead 7 through the first resin layer 8 and is fixed integrally with the adjacent secondary layer flat box 3 through a link mechanism.

[0043] The link mechanism includes a lower mounting plate 10, a wooden wedge block 11, an upper mounting plate 12 and a link 13. The lower mounting plate 10 presses on the feet 14 of the transverse annular secondary layer insulation box and the feet 15 of the secondary layer flat box. The wooden wedge block 11 is arranged on the lower mounting plate 10 through the second resin layer 9. The upper mounting plate 12 is arranged on the wooden wedge block 11. The lower mounting plate 10, the wooden wedge block 11 and the upper mounting plate 12 are connected integrally through a plurality of fasteners 18, and the fasteners 18 are bolts. The function of the second resin layer 9 between the wooden wedge block 11 and the lower mounting plate 10 is to adjust the flatness of the surface of the lower mounting plate 10 so that the flatness of its upper end surface meets the requirements.

[0044] A first mounting hole 19 is provided at the center of the lower mounting plate 10, a second mounting hole 20 is provided at the center of the wooden wedge block 11, and a third mounting hole 21 is provided at the center of the upper mounting plate 12. The first mounting hole 19, the second mounting hole 20 and the third mounting hole 21 are communicated. One end of the link 13 is threadedly fixed in a base 22 arranged between the feet 14 of the transverse annular secondary layer insulation box and the feet 15 of the secondary layer flat box, and the other end passes through the first mounting hole 19 and is limited in the second mounting hole 20 through an elastic locking assembly. In this embodiment, the second mounting hole 20 is a variable-diameter slot hole, and its cross-section is convex. After the upper end portion of the link 13 passes through the lower slot hole of the first mounting hole 19 and the second mounting hole 20, it is placed in the upper slot hole of the second mounting hole 20, but there is a certain distance between the upper end portion of the link 13 and the upper hole edge of the upper slot hole of the second mounting hole 20. In this way, when the vertical deformation occurs in the liquid cargo tank during the shipping of the ship, under the combined action of the elastic locking assembly, the vertical deformation of the liquid cargo tank can be effectively reduced, the integrity of the insulation layer of the enclosure system can be effectively guaranteed, and at the same time, the liquid cargo evaporation rate can also be reduced.

[0045] The elastic locking assembly includes a locking nut 23, a locking plate 24, and a spring washer 25. The locking nut 23 and the locking plate 24 are sleeved on the connecting rod 13. The locking plate 24 is located above the locking nut 23 and contacts the locking nut 23. The locking plate 24 is fixedly welded to the connecting rod 13. The body of the locking nut 23 extends into the first mounting hole 19. The spring washer 25 is sleeved on the body of the locking nut 23, with one end abutting and fixed to the nut head of the locking nut 23 and the other end abutting and fixed to the upper surface of the lower mounting plate 10.

[0046] When the connecting rod 13 is threadedly fixed to the base 22 welded to the bulkhead and is fixedly connected to the lower mounting plate 10 through the elastic locking assembly, and the lower mounting plate 10, the wooden wedge block 11, and the upper mounting plate 12 are connected into one body by multiple sets of fasteners, the lower mounting plate 10 tightly presses the transverse ring sub-layer insulation box 1 and the adjacent sub-layer flat box 3, thereby fixing the two into one body.

[0047] A sub-layer Invar film 26 is provided on the upper end surface of the sub-layer insulation structure formed by the transverse ring sub-layer insulation box 1 and the adjacent sub-layer flat box 3. A transverse ring main-layer insulation box 2 and a main-layer flat box 4 are provided on the sub-layer Invar film 26. The transverse ring main-layer insulation box 2 is located above the transverse ring sub-layer insulation box 1, and the right-angle surface of the transverse ring main-layer insulation box 2 is aligned with the right-angle surface of the transverse ring sub-layer insulation box 1 and is fixedly connected to the adjacent main-layer flat box 4 through a fixing mechanism. The fixing mechanism passes through the sub-layer Invar film 26 and is fixed to the connecting rod mechanism.

[0048] The fixing mechanism includes a fixing plate 27, a fixing stud 28, and a spring washer 29. The fixing plate 27 presses on the support feet 16 of the transverse ring main-layer insulation box and the support feet 17 of the main-layer flat box. The fixing stud 28 passes through the center of the fixing plate 27 and locks and fixes the fixing plate 27 through a self-locking nut 30 provided thereon. The lower end of the fixing stud 28 passes through the sub-layer Invar film 26 and is threadedly fixed in the third mounting hole 21. The spring washer 29 is provided between the self-locking nut 30 and the fixing plate 27. In this embodiment, the spring washer 29 is a convex arc-shaped washer.

[0049] When the fixing stud 28 vertically passes through the fixing plate 27 and the sub-layer Invar film 26 and its lower end is threadedly fixed in the third mounting hole 21, the self-locking nut 30 is screwed on from its upper end to lock the fixing plate 27. In this way, the fixing plate 27 tightly presses the transverse ring main-layer insulation box 2 and the adjacent main-layer flat box 4, thereby fixing the two into one body.

[0050] Preferably, the position where the fixing stud 28 contacts the sub-layer Invar film 26 can be locked by tack welding.

[0051] Insulating materials 31 are filled in the gaps between the transverse annular secondary layer insulating box 1 and the adjacent secondary layer flat box 3, and between the transverse annular main layer insulating box 2 and the adjacent main layer flat box 4. The insulating material 31 can be selected from rigid PVC foam insulation or glass wool.

[0052] Preferably, at least one layer of plywood 32 is further provided on the top of the transverse annular secondary layer insulating box 1 and / or the bottom of the transverse annular main layer insulating box 2 to ensure that the upper end surface of the transverse annular secondary layer insulating box 1 is flush with the upper end surface of the adjacent secondary layer flat box 3 after installation, and the upper end surface of the transverse annular main layer insulating box 2 is flush with the upper end surface of the adjacent main layer flat box 4 after installation.

[0053] Preferably, grooves 33 are provided on the surfaces of the transverse annular secondary layer insulating box 1 and the transverse annular main layer insulating box 2 that are close to the transverse annular Invar tube area 5, so as to leave a certain gap between them and the transverse annular Invar tube area 5 after installation for gas circulation to ensure pressure balance of the insulating layer. Process holes 34 are provided on both side end faces of the transverse annular secondary layer insulating box 1 and the transverse annular main layer insulating box 2 to ensure gas circulation.

[0054] The present invention also provides an installation method for the transverse annular insulating box structure of the LNG ship containment system, which specifically includes the following steps:

[0055] S1. Install the transverse annular secondary layer insulating box 1 in the transition area between the transverse annular Invar tube area 5 and the flat area of the containment system. The cross-section of the transverse annular secondary layer insulating box 1 is a right trapezoid, and the included angle of the cross-section is equal to the included angle between the ship's transverse bulkhead 6 and longitudinal bulkhead 7. A layer of first resin layer 8 is provided between the transverse annular secondary layer insulating box 1 and the ship's transverse bulkhead 6 or longitudinal bulkhead 7.

[0056] S2. Fix the transverse annular secondary layer insulating box 1 and the adjacent secondary layer flat box 3 into one body by using a link mechanism.

[0057] First, weld and fix the base 22 on the bulkhead between the transverse annular secondary layer insulating box support feet 14 and the secondary layer flat box support feet 15.

[0058] Then, thread-fix the lower end of the link 13 on the base 22; then place the lower mounting plate 10 on the upper surfaces of the transverse annular secondary layer insulating box 1 and the secondary layer flat box 3, make the link 13 pass through the first mounting hole 19 of the lower mounting plate 10, and then install an elastic locking component at the upper end of the link 13.

[0059] Then, sequentially install the wooden wedge block 11 and the upper mounting plate 12. A second resin layer 9 for leveling is provided between the wooden wedge block 11 and the lower mounting plate 10. After the wooden wedge block 11 and the upper mounting plate 12 are installed, fix the lower mounting plate 10, the wooden wedge block 11 and the upper mounting plate 12 into one body with bolts.

[0060] S3. Lay the secondary - layer invar film 26 on the upper surface of the secondary - layer insulation structure formed by the transverse - ring secondary - layer insulation box 1 and its adjacent secondary - layer flat box 3, and then make holes in the secondary - layer invar film 26.

[0061] S4. Place the transverse - ring main - layer insulation box 2 with a right - angled trapezoidal cross - section and the included angle of the cross - section equal to the included angle between the ship's transverse bulkhead 6 and longitudinal bulkhead 7 on the secondary - layer invar film 26, and align the right - angled surface of the transverse - ring main - layer insulation box 2 with the right - angled surface of the transverse - ring secondary - layer insulation box 1.

[0062] Then place the fixing plate 27 on the upper surfaces of the transverse - ring main - layer insulation box 2 and the main - layer flat box 4. After vertically passing the fixing stud 28 through the fixing plate 27 and the secondary - layer invar film 26, thread - fix it in the third mounting hole 21 of the upper mounting plate 12.

[0063] Finally, sleeved the spring washer 29 on the fixing stud 28 and make it close to the fixing plate 27, and then screw the self - locking nut 30 on the fixing stud 28 to lock and fix it.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A transverse ring insulation box structure for an LNG ship containment system, characterized in that, The insulating box structure is arranged in the transition area between the transverse ring Invar pipe area and the plane area of the enclosure system. The insulating box structure includes a transverse ring secondary layer insulating box and a transverse ring main layer insulating box with a right trapezoidal cross-section, and the included angle of the cross-section is equal to the included angle between the transverse bulkhead and the longitudinal bulkhead of the ship's hull. The transverse ring secondary layer insulating box is arranged on the transverse bulkhead or longitudinal bulkhead of the ship's hull through the first resin layer and is fixed integrally with the adjacent secondary layer plane box through a connecting rod mechanism. A secondary layer Invar film is arranged on the upper end surface of the secondary layer insulating structure formed by the transverse ring secondary layer insulating box and its adjacent secondary layer plane box. A transverse ring main layer insulating box and a main layer plane box are arranged on the secondary layer Invar film. The right-angle surface of the transverse ring main layer insulating box is aligned with the right-angle surface of the transverse ring secondary layer insulating box and is fixed integrally with the adjacent main layer plane box through a fixing mechanism. The fixing mechanism passes through the secondary layer Invar film and is fixed to the connecting rod mechanism. Insulating materials are filled in the gaps between the transverse ring secondary layer insulating box and its adjacent secondary layer plane box, and between the transverse ring main layer insulating box and its adjacent main layer plane box.

2. The LNG ship containment system transverse ring insulation box structure according to claim 1, characterized in that Grooves are arranged on the surfaces of the transverse ring secondary layer insulating box and the transverse ring main layer insulating box close to the transverse ring Invar pipe area to facilitate the circulation of gas in the insulating layer to ensure pressure balance.

3. The LNG ship containment system transverse ring insulation box structure according to claim 1 or 2, characterized in that, Process holes are arranged on both side end faces of the transverse ring secondary layer insulating box and the transverse ring main layer insulating box to facilitate the circulation of gas in the insulating layer to ensure pressure balance.

4. The transverse ring insulation box structure of the LNG ship containment system according to claim 1, characterized in that, The transverse ring secondary layer insulating box and the transverse ring main layer insulating box are both hexahedron structures, and the lengths of the upper short side and the lower long side of their respective cross-sections are determined according to the dimensions at their installation positions, and the height of the cross-section is determined according to the plane box and the thickness of the insulating layer at their installation positions.

5. The transverse ring insulation box structure of the LNG ship containment system according to claim 1, characterized in that, The included angle between the transverse bulkhead and the longitudinal bulkhead of the ship's hull is 74.48° or 78.89°.

6. The LNG ship containment system transverse ring insulation box structure according to claim 1, characterized in that, The connecting rod mechanism includes a lower mounting plate, a wooden wedge block, an upper mounting plate and a connecting rod. The lower mounting plate presses on the feet of the transverse ring secondary layer insulating box and the feet of the secondary layer plane box. The wooden wedge block is arranged on the lower mounting plate through the second resin layer. The upper mounting plate is arranged on the wooden wedge block. The lower mounting plate, the wooden wedge block and the upper mounting plate are connected integrally through multiple groups of fasteners. A first mounting hole is arranged in the center of the lower mounting plate. A second mounting hole is arranged in the center of the wooden wedge block. A third mounting hole is arranged in the center of the upper mounting plate. One end of the connecting rod is fixed by threading in a base arranged between the feet of the transverse ring secondary layer insulating box and the feet of the secondary layer plane box, and the other end passes through the first mounting hole and is limited in the second mounting hole through an elastic locking component. The lower end part of the fixing mechanism is fixed by threading in the third mounting hole.

7. The LNG ship containment system transverse ring insulation box structure according to claim 6, characterized in that, The elastic locking component includes a locking nut, a locking plate and a spring washer. The locking nut and the locking plate are sleeved on the connecting rod. The body of the locking nut extends into the first mounting hole, and the nut head contacts the locking plate. The locking plate is welded and fixed to the connecting rod. The spring washer is sleeved on the body of the locking nut, and one end of it abuts and is fixed to the nut head of the locking nut, and the other end abuts and is fixed to the upper surface of the lower mounting plate.

8. The LNG ship containment system transverse ring insulation box structure according to claim 6, characterized in that, The fixing mechanism includes a fixing plate, fixing studs and spring washers. The fixing plate presses on the feet of the transverse ring main layer insulation box and the feet of the main layer flat box. The fixing studs pass through the center of the fixing plate and are locked and fixed by self-locking nuts arranged thereon. The lower end of the fixing stud is threadedly fixed in the third mounting hole, and the spring washer is arranged between the self-locking nut and the fixing plate.

9. The transverse ring insulation box structure of the LNG ship containment system according to claim 1, characterized in that, Plywood is also provided on the top of the transverse ring secondary layer insulation box and / or the bottom of the transverse ring main layer insulation box.

10. A method for installing the transverse ring insulation box structure of the LNG ship containment system according to any one of claims 1-9, characterized in that, Specifically, it includes the following steps: S1. Install the transverse ring secondary layer insulation box in the transition area between the transverse ring Invar tube area and the flat area of the enclosure system. The cross-section of the transverse ring secondary layer insulation box is a right trapezoid, and the included angle of the cross-section is equal to the included angle between the transverse bulkhead and the longitudinal bulkhead of the hull. A layer of first resin layer is provided between the transverse ring secondary layer insulation box and the transverse bulkhead or longitudinal bulkhead of the hull. S2. Use a linkage mechanism to fix the transverse ring secondary layer insulation box and the adjacent secondary layer flat box into one body. S3. Lay a secondary layer Invar film on the upper end surface of the secondary layer insulation structure formed by the transverse ring secondary layer insulation box and the adjacent secondary layer flat box, and then punch holes in the secondary layer Invar film. S4. Place the transverse ring main layer insulation box with a cross-section of a right trapezoid and an included angle of the cross-section equal to the included angle between the transverse bulkhead and the longitudinal bulkhead of the hull on the secondary layer Invar film, and align the right-angle surface of the transverse ring main layer insulation box with the right-angle surface of the transverse ring secondary layer insulation box. Then, fix it to the adjacent main layer flat box through the fixing mechanism. The lower end of the fixing mechanism passes through the hole in the secondary layer Invar film and is fixed to the linkage mechanism.

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