Method for installing a double-walled pipe and a top deck section of a bunkering of a dual-fuel container ship

Abstract

The present application relates to a method for installing a fuel tank top deck section and double-wall pipes of a dual-fuel container ship, which divides the deck section into a deck assembly, an A-zone longitudinal bulkhead assembly, a B-zone longitudinal bulkhead assembly and a C-zone longitudinal bulkhead assembly; the deck assembly and the C-zone longitudinal bulkhead assembly are separately built, the A-zone longitudinal bulkhead assembly is integrally built when the deck assembly is built; the B-zone longitudinal bulkhead assembly is separately built; sand-blasting and painting are performed; the deck assembly is reversely placed and the B-zone longitudinal bulkhead assembly is separately installed; four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly are separately installed on the deck assembly, double-wall pipes are passed through the four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly, and the rib plates between the four longitudinal bulkhead plates are installed; and the C-zone longitudinal bulkhead assembly is mounted on the B-zone longitudinal bulkhead assembly. The present application divides the deck section into different assemblies for building, installs the double-wall pipes and mounts the assemblies after sand-blasting and painting, so as to avoid damaging the double-wall pipes.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a method for installing the top deck section and double-walled pipes of the fuel tank of a dual-fuel container ship. Background Technology

[0002] When constructing the deck section above the fuel tank of a 13,000 TEU dual-fuel container ship, there are 8 double-wall pipes between the longitudinal bulkheads. These 8 double-wall pipes need to pass through 4 longitudinal bulkheads, and some of them also need to pass through the ribs between the longitudinal bulkheads. Since the connection of the double-wall pipes requires argon arc welding, in order to reduce the welding difficulty and safety risks, the double-wall pipes in the bend area need to be spliced ​​together and installed as a whole, that is, installed with bends, to avoid the loose installation of the bend area.

[0003] If the double-walled pipe is installed after the conventional segmented structure is completed, a large amount of the structure needs to be removed during installation. However, if the double-walled pipe is installed in advance, it will be damaged during sand flushing. Summary of the Invention

[0004] To address the significant installation challenges of double-walled tubes passing through longitudinal bulkhead areas and ribs, this invention provides a method for installing double-walled tubes in the top deck section of the fuel tank of a dual-fuel container ship. The ribs at the double-walled tube assembly point are divided into upper and lower ribs. After sandblasting and coating, the double-walled tubes are installed to avoid damage.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A dual-fuel container ship fuel tank top deck section includes a deck section, longitudinal bulkheads, and double bulkhead tubes. The longitudinal bulkheads are installed below the deck section and include a first longitudinal bulkhead spanning the deck section and a second longitudinal bulkhead not spanning the deck section. At one end near the first longitudinal bulkhead, the second longitudinal bulkhead is arranged parallel to the first longitudinal bulkhead and close to the deck section. A platform plate is provided below the second longitudinal bulkhead and penetrates the first longitudinal bulkhead. The double bulkhead tubes pass through the overlapping area of ​​the second and first longitudinal bulkheads, and the area through which the double bulkhead tubes pass is located above the platform plate.

[0007] The first longitudinal bulkhead includes two parallel longitudinal bulkheads, and the second longitudinal bulkhead includes two parallel longitudinal bulkheads and is arranged parallel to the outside of the two longitudinal bulkheads of the first longitudinal bulkhead.

[0008] Ribs connect two adjacent longitudinal bulkheads, and the ribs are set vertically perpendicular to the adjacent longitudinal bulkheads.

[0009] The application also provides a method for installing a double-wall pipe in a top deck section of a fuel tank of a dual-fuel container ship, wherein the longitudinal bulkhead is divided into an A zone, a B zone and a C zone, the B zone is an overlapping area of the second longitudinal bulkhead and the first longitudinal bulkhead, the C zone is an area of the first longitudinal bulkhead with a platform plate below the B zone, and the A zone is an area of the longitudinal bulkhead other than the B zone and the C zone.

[0010] The method comprises the following steps:

[0011] Step 1: dividing the deck section into a deck assembly, an A-zone longitudinal bulkhead assembly, a B-zone longitudinal bulkhead assembly and a C-zone longitudinal bulkhead assembly.

[0012] Step 2: separately building the deck assembly and the C-zone longitudinal bulkhead assembly, integrally building the A-zone longitudinal bulkhead assembly when building the deck assembly, and separately building the B-zone longitudinal bulkhead assembly to form four longitudinal bulkhead plates and a plurality of double-wall pipes.

[0013] Step 3: sand-blasting and painting the four longitudinal bulkhead plates of the deck assembly, the A-zone longitudinal bulkhead assembly, the C-zone longitudinal bulkhead assembly and the B-zone longitudinal bulkhead assembly.

[0014] Step 4: placing the deck assembly in a reverse state, and separately installing the four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly on the deck assembly, passing the double-wall pipes through the four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly, and installing the rib plates between the four longitudinal bulkhead plates.

[0015] Step 5: loading the C-zone longitudinal bulkhead assembly on the B-zone longitudinal bulkhead assembly.

[0016] Further, when the double-wall pipes pass through elbows between adjacent longitudinal bulkhead plates and the elbows pass through the rib plates between the longitudinal bulkhead plates, the method further comprises dividing the rib plates of the elbow passing area into upper rib plates and lower rib plates from the position where the double-wall pipes pass through the elbows, and installing the lower rib plates first, and then installing the upper rib plates after the double-wall pipes passing through the position above the lower rib plates are positioned.

[0017] Further, when the double-wall pipes pass through elbows between adjacent longitudinal bulkhead plates and the elbows pass through the rib plates between the longitudinal bulkhead plates, the longitudinal bulkhead plate on one side of the elbow is first installed on the deck assembly, then the double-wall pipes pass through the longitudinal bulkhead plate, the lower rib plates are installed, then the longitudinal bulkhead plate on the other side of the elbow passes through the double-wall pipes and is installed on the deck assembly, the upper rib plates are installed, and the upper rib plates and the lower rib plates are connected in an upper-lower manner.

[0018] Further, when the double-wall pipes do not pass through elbows or the elbows do not pass through the rib plates between adjacent longitudinal bulkhead plates, the rib plates and the longitudinal bulkhead plates are first installed, and then the double-wall pipes are separately installed.

[0019] Further, structural reinforcement is performed on each subassembly and longitudinal bulkhead plate before sandblasting and painting.

[0020] Compared with the prior art, the application has the beneficial effects that:

[0021] 1. The application provides a double-fuel container ship fuel tank top deck section, which centrally arranges double-wall pipes, facilitating structural division of the deck section during construction.

[0022] 2. The application also provides a method for installing double-wall pipes in a double-fuel container ship fuel tank top deck section, which divides the structure into different subassemblies for construction, and installs and assembles the double-wall pipes after sandblasting and painting, thereby avoiding damage to the double-wall pipes.

[0023] 3. The application divides the rib plate in the area where the double-wall pipe elbow exists into an upper rib plate and a lower rib plate, solving the problem that the double-wall pipe elbow cannot be integrally assembled with the elbow, reducing the installation difficulty of the double-wall pipe, and being conducive to improving the construction efficiency and realizing pre-assembly of the double-wall pipe at the section stage.

[0024] 4. The application installs the BB area longitudinal bulkhead subassembly where the double-wall pipe is located through reverse state setting of the deck subassembly, facilitating hoisting and avoiding the difficulty of hoisting in a narrow space. DETAILED DESCRIPTION

[0025] Figure 1 is a reverse state resting schematic diagram of the double-fuel container ship fuel tank top deck section in the embodiment of the application.

[0026] Figure 2 is a schematic diagram of integrated construction of the deck subassembly and the A area longitudinal bulkhead subassembly in the application.

[0027] Figure 3 is a schematic diagram of the B area longitudinal bulkhead subassembly in the application.

[0028] Figure 4 is a schematic diagram of the C area longitudinal bulkhead subassembly structure.

[0029] Figure 5 is a structural reinforcement schematic diagram of the 3874 longitudinal bulkhead plate in the B area longitudinal bulkhead subassembly.

[0030] Figure 6 is a structural reinforcement schematic diagram of the L-5 longitudinal bulkhead plate in the B area longitudinal bulkhead subassembly.

[0031] Figure 7 is a structural reinforcement schematic diagram of the L-6 longitudinal bulkhead plate in the B area longitudinal bulkhead subassembly.

[0032] Figure 8 is a structural reinforcement schematic diagram of the 5694 longitudinal bulkhead plate in the B area longitudinal bulkhead subassembly.

[0033] Figure 9 is the butt joint diagram of the upper and lower rib plates in the present application.

[0034] In the figure:

[0035] 1, deck section; 2, double-wall pipe; 3, L-5 longitudinal bulkhead; 4, L-6 longitudinal bulkhead; 5, 3874 longitudinal bulkhead; 6, 5694 longitudinal bulkhead; 7, platform plate; 8, longitudinal reinforcement; 9, vertical reinforcement; 10, diagonal brace reinforcement; 11, channel steel reinforcement; 12, 3874 longitudinal bulkhead plate; 13, L-5 longitudinal bulkhead plate; 14, L-6 longitudinal bulkhead plate; 15, 5694 longitudinal bulkhead plate; 16, angle steel profile; 17, double-wall pipe cladding; 18, upper rib plate; 19, lower rib plate. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be further described below in combination with specific embodiments:

[0037] A double-fuel container ship fuel tank top deck section, for example, a 13000 container double-fuel container ship, as shown in Figure 1 , Figure 1 The middle deck section is reversely placed, including a deck section 1, longitudinal bulkheads, and double-wall pipes 2; the longitudinal bulkheads are installed below the deck section 1, and the longitudinal bulkheads include first longitudinal bulkheads that cross the deck section and second longitudinal bulkheads that do not cross the deck section.

[0038] The first longitudinal bulkheads include L-5 longitudinal bulkheads 3 and L-6 longitudinal bulkheads 4 arranged in parallel, and the second longitudinal bulkheads include 3874 longitudinal bulkheads 5 and 5694 longitudinal bulkheads 6 arranged in parallel, the 3874 longitudinal bulkheads 5 and the 5694 longitudinal bulkheads 6 are located outside the L-5 longitudinal bulkheads 3 and the L-6 longitudinal bulkheads 4, and four longitudinal bulkheads are arranged in parallel, and a rib plate is connected between two adjacent longitudinal bulkheads, and the rib plate is vertically arranged perpendicular to the adjacent longitudinal bulkheads.

[0039] L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 are continuous longitudinal bulkheads along the deck section, 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are discontinuous longitudinal bulkheads on the deck section, 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are arranged near one end of L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 and near the deck section 1; a platform plate 7 is arranged below 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6, the platform plate 7 penetrates L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4; the double-wall pipe 2 penetrates the overlapping areas of 3874 longitudinal bulkhead 5, L-5 longitudinal bulkhead 3, L-6 longitudinal bulkhead 4 and 5694 longitudinal bulkhead 6 in turn, and the elbows of the double-wall pipe 2 are concentrated between L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. In this embodiment, eight double-wall pipes penetrate four longitudinal bulkheads, among which the elbows of seven double-wall pipes exist between L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4, and the elbow of one double-wall pipe exists between L-5 longitudinal bulkhead 3 and 3874 longitudinal bulkhead 5. The above-mentioned upper and lower are relative positions under the normal placement of the deck section.

[0040] The embodiment also provides a method for installing the double-wall pipe in the top deck section of the fuel tank of the double-fuel container ship, the longitudinal bulkhead is divided into an A area, a B area and a C area, the B area is the overlapping area of the second longitudinal bulkhead and the first longitudinal bulkhead, the C area is the first longitudinal bulkhead area below the B area with a platform plate, and the A area is the longitudinal bulkhead area outside the B area and the C area;

[0041] The method comprises the following steps:

[0042] Step 1, dividing the deck section into a deck assembly, an A area longitudinal bulkhead assembly, a B area longitudinal bulkhead assembly and a C area longitudinal bulkhead assembly;

[0043] Step 2, the deck assembly and the C area longitudinal bulkhead assembly are separately built, the A area longitudinal bulkhead assembly is integrally built when the deck assembly is built; the B area longitudinal bulkhead assembly is scatteredly made to form four longitudinal bulkhead plates and a plurality of double-wall pipes;

[0044] As shown in Figure 2 , the A area longitudinal bulkhead assembly is integrally built on the deck assembly, that is, part of the L-5 longitudinal bulkhead and part of the L-6 longitudinal bulkhead are pre-assembled on the deck section 1.

[0045] The B area longitudinal bulkhead assembly is shown in Figure 3 , which is a B area longitudinal bulkhead assembly composition diagram and has not been assembled during scattered production. Figure 3

[0046] The C area longitudinal bulkhead assembly is shown in Figure 4 , the platform plate is pre-assembled together with part of the L-5 longitudinal bulkhead and part of the L-6 longitudinal bulkhead.

[0047] ​As preferred, the sand-blasting and painting further comprises reinforcing the structures of each of the deck assembly and the longitudinal bulkhead assembly, specifically including:

[0048] The openings of the deck assembly and the longitudinal bulkhead assembly of the A area are reinforced by longitudinal reinforcements 8, vertical reinforcements 9 and diagonal reinforcements 10, the longitudinal reinforcements 8 are parallel to the deck, the vertical reinforcements 9 are perpendicular to the deck, and the diagonal reinforcements 10 are inclinedly supported between the longitudinal reinforcements 8 and the vertical reinforcements 9, as shown in Figure 2 .

[0049] The structures of the longitudinal bulkhead assembly of the C area are reinforced as shown in Figure 4 , and channel steel reinforcements 11 are arranged at the lower openings of the longitudinal bulkhead assembly of the C area. In this embodiment, all the lower openings and upper openings refer to the positions in the normal state.

[0050] For the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of the B area, i.e. the 3874 longitudinal bulkhead plate 12, the L-5 longitudinal bulkhead plate 13, the L-6 longitudinal bulkhead plate 14 and the 5694 longitudinal bulkhead plate 15, it should be noted that the 3874 longitudinal bulkhead plate 12 is essentially the 3874 longitudinal bulkhead 5, the 5694 longitudinal bulkhead plate is essentially the 5694 longitudinal bulkhead 6, and the L-5 longitudinal bulkhead plate 13 is only a part of the L-5 longitudinal bulkhead 3, and the L-6 longitudinal bulkhead plate 14 is only a part of the L-6 longitudinal bulkhead 4; as shown in Figure 5 , 6 , 7, 8, one angle steel profile 16 is arranged at the upper and lower openings of the 3874 longitudinal bulkhead plate 12, the L-5 longitudinal bulkhead plate 13, the L-6 longitudinal bulkhead plate 14 and the 5694 longitudinal bulkhead plate 15, respectively, and the angle steel profile is welded on the non-structural surface of the longitudinal bulkhead plate, i.e. the smooth surface. In addition, a plurality of vertical reinforcements 9 are welded between the angle steel profiles 16 perpendicular to the upper and lower openings, and are also installed on the non-structural surface.

[0051] Step 3, sand-blasting and painting the four longitudinal bulkhead plates of the deck assembly, the longitudinal bulkhead assembly of the A area, the longitudinal bulkhead assembly of the C area and the longitudinal bulkhead assembly of the B area, respectively, and the reinforcing structures need to be removed before the installation of each assembly.

[0052] Step 4, the deck assembly is placed in the reverse state, and the longitudinal bulkhead assembly of the B area is installed in bulk: the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of the B area are installed on the deck assembly, the double-wall pipes are passed through the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of the B area, and the rib plates between the four longitudinal bulkhead plates are installed;

[0053] In this embodiment, the double-wall pipe passes through the rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14. First, the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 are installed. When installing, the L-5 longitudinal bulkhead plate 13 is installed on the deck assembly (the L-6 longitudinal bulkhead plate can be installed first). Four longitudinal bulkhead plates are respectively provided with pipe holes for the double-wall pipe to pass through. Then, the double-wall pipe 2 passes through the pipe hole of the L-5 longitudinal bulkhead plate 13. Then, the rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 is installed, which divides the rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 into an upper rib plate 18 and a lower rib plate 19, as shown in FIG. 18. First, the lower rib plate 19 is installed on the deck assembly. Then, the L-6 longitudinal bulkhead plate 14 is installed. After the double-wall pipe 2 passes through the pipe hole of the L-6 longitudinal bulkhead plate 14, the L-6 longitudinal bulkhead plate 14 is positioned and fixed. Then, the double-wall pipe 2 is positioned. Finally, the upper rib plate 18 is installed. The upper rib plate 18 is installed above the lower rib plate 19 (here, above refers to the position above in the inverted state). The upper rib plate 18 and the lower rib plate 19 are in butt joint. Figure 9

[0054] Since the double-wall pipe between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13 does not pass through the rib plate with a bend, and the double-wall pipe between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14 does not pass through the rib plate with a bend, the rib plate between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13 and the rib plate between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14 do not need to be divided into two sections. When installing, there are two cases:

[0055] First case: although there are a small number of bends between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13, the bends do not pass through the rib plate;

[0056] Second case: there are no bends between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14, and no double-wall pipe passes through the rib plate;

[0057] For the first case, the 3874 longitudinal bulkhead plate 12 can be installed on the deck assembly first. Then, the rib plate between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13 is installed. Then, the double-wall pipe 2 passing through the 3874 longitudinal bulkhead plate 12 is connected to the double-wall pipe passing through the L-5 longitudinal bulkhead plate 13. Since there is no bend, the double-wall pipe passing through the 3874 longitudinal bulkhead plate 12 can directly pass through the rib plate between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13.

[0058] ​For the second case, since no double-wall pipe passes through the rib plate, the rib plate between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14 can be pre-installed on the 5694 longitudinal bulkhead plate 15 or installed after the installation of the 5694 longitudinal bulkhead plate 15, and the double-wall pipe passing through the 5694 longitudinal bulkhead plate 15 is connected with the double-wall pipe passing through the L-6 longitudinal bulkhead plate 14 after the installation of the 5694 longitudinal bulkhead plate 15.

[0059] Step 5, the C area longitudinal bulkhead assembly is mounted on the B area longitudinal bulkhead assembly, the C area longitudinal bulkhead assembly is mounted in the way of embedding and filling, and the external size of the C area longitudinal bulkhead assembly is reduced by 3-5 mm in advance to ensure the smooth installation.

[0060] For the external double-wall pipe passing through the 3874 longitudinal bulkhead plate and the 5694 longitudinal bulkhead plate, a double-wall pipe cover plate 17 is further installed, the double-wall pipe cover plate 17 is installed on the outside of the double-wall pipe 2, and the double-wall pipe cover plate 17 is welded and connected with the 3874 longitudinal bulkhead plate 12 and the 5694 longitudinal bulkhead plate 15.

[0061] The embodiment is only a further explanation of the present application and is not a limitation of the present application, and those skilled in the art can make non-creative modifications to the embodiment according to the needs after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for installing double-walled pipes within a section of the top deck of the fuel tank of a dual-fuel container ship, characterized in that, The dual-fuel container ship's fuel tank top deck section includes a deck section, longitudinal bulkheads, and double-bulk tubes. The longitudinal bulkheads are installed below the deck section and include a first longitudinal bulkhead that spans the deck section and a second longitudinal bulkhead that does not span the deck section. At the end near the first longitudinal bulkhead, the second longitudinal bulkhead is arranged parallel to the first longitudinal bulkhead and close to the deck section. A platform plate is provided below the second longitudinal bulkhead and penetrates the first longitudinal bulkhead. The double-bulk tubes pass through the overlapping area of ​​the second and first longitudinal bulkheads, and the area through which the double-bulk tubes pass is located above the platform plate. The first longitudinal bulkhead includes two parallel longitudinal bulkheads, and the second longitudinal bulkhead includes two parallel longitudinal bulkheads and is arranged parallel to the outside of the two longitudinal bulkheads of the first longitudinal bulkhead. Ribs connect two adjacent longitudinal bulkheads, and the ribs are set vertically perpendicular to the adjacent longitudinal bulkheads. The longitudinal bulkhead is divided into area A, area B and area C. Area B is the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead. Area C is the area of ​​the first longitudinal bulkhead with a platform plate below area B. Area A is the longitudinal bulkhead area other than areas B and C. The method includes the following steps: Step 1: Divide the deck into deck assembly, longitudinal bulkhead assembly in area A, longitudinal bulkhead assembly in area B, and longitudinal bulkhead assembly in area C. Step 2: The deck assembly and the longitudinal bulkhead assembly of Zone C are constructed separately. The longitudinal bulkhead assembly of Zone A is constructed as a whole during the deck assembly. The longitudinal bulkhead assembly of Zone B is fabricated in bulk to form four longitudinal bulkhead panels and several double-walled tubes. Step 3: Sandblasting and painting are carried out on the four longitudinal bulkhead panels of the deck assembly, the longitudinal bulkhead assembly of area A, the longitudinal bulkhead assembly of area C, and the longitudinal bulkhead assembly of area B. Step 4: Deck assembly reverse resting, bulk installation of the longitudinal bulkhead assembly of Zone B: Install the four longitudinal bulkhead panels of the Zone B assembly onto the deck assembly respectively, pass the double bulkhead pipe through the four longitudinal bulkhead panels of the Zone B assembly, and install the ribs between the four longitudinal bulkhead panels. When the double bulkhead pipe passes between adjacent longitudinal bulkhead panels and there is a bend and the bend passes through the ribs between the longitudinal bulkhead panels, the method also includes dividing the ribs in the bend-passing area into upper ribs and lower ribs from the position where the double bulkhead pipe passes through the bend. During installation, the lower ribs are installed first, and the upper ribs are installed after the double bulkhead pipe passing through the position above the lower ribs is positioned. Step 5: Mount the longitudinal bulkhead assembly of section C onto the longitudinal bulkhead assembly of section B.

2. The method for installing double-walled pipes within a section of the top deck of a dual-fuel container ship's fuel tank according to claim 1, characterized in that, When a double-bulk tube passes between adjacent longitudinal bulkheads and there is a bend that passes through the rib between the longitudinal bulkheads, first install the longitudinal bulkhead on the side of the bend onto the deck assembly, then pass the double-bulk tube through the longitudinal bulkhead and install the lower rib. Then pass the longitudinal bulkhead on the other side of the bend through the double-bulk tube and install it onto the deck assembly, and then install the upper rib. The upper rib and the lower rib are then connected vertically.

3. The method for installing double-walled pipes within a section of the top deck of a dual-fuel container ship's fuel tank according to claim 1, characterized in that, When a double-walled pipe passes between adjacent longitudinal bulkheads and there is no bend or the bend does not pass through the rib, the rib and longitudinal bulkhead are installed first, and then the double-walled pipe is installed in bulk.

4. The method for installing double-walled pipes within the top deck section of the fuel tank of a dual-fuel container ship according to claim 1, characterized in that, The process before sandblasting and painting also includes structural reinforcement of each assembly and longitudinal bulkhead.

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