Top deck section of fuel tank of dual-fuel container ship and method for mounting double-walled pipe

Abstract

The present invention relates to a top deck section of a fuel tank of a dual-fuel container ship and a method for mounting a double-walled pipe. The method comprises: dividing a 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; separately constructing the deck assembly and the C-zone longitudinal bulkhead assembly, and integrally constructing the A-zone longitudinal bulkhead assembly when the deck assembly is constructed; manufacturing the B-zone longitudinal bulkhead assembly as loose parts; carrying out sand blasting and coating; mounting the B-zone longitudinal bulkhead assembly as loose parts when the deck assembly is placed reversely: mounting four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly on the deck assembly, respectively, causing the double-walled pipe to pass through the four longitudinal bulkhead plates of the B-zone longitudinal bulkhead assembly, and mounting rib plates between the four longitudinal bulkhead plates; and erecting the C-zone longitudinal bulkhead assembly on the B-zone longitudinal bulkhead assembly. In the present invention, the deck section is divided into different assemblies to be constructed, and after sand blasting and coating are carried out, the double-walled pipe is mounted, and the assemblies are erected, so as to prevent damage to the double-walled pipe.

Description

Installation method of top deck section and double-walled pipes for fuel tank of dual-fuel container ship 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 present invention also provides a method for installing a double-walled tube in the top deck section of the fuel tank of a dual-fuel container ship, wherein 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, and area A is the longitudinal bulkhead area other than areas B and C.

[0010] The method includes the following steps:

[0011] 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.

[0012] 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.

[0013] Step 3: Sandblasting and painting are carried out on the four longitudinal bulkhead panels of the deck assembly, A-zone longitudinal bulkhead assembly, C-zone longitudinal bulkhead assembly and B-zone longitudinal bulkhead assembly respectively.

[0014] Step 4: Deck assembly reverse resting, bulk installation of the B-section longitudinal bulkhead assembly: Install the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly onto the deck assembly, pass the double bulkhead tubes through the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly, and install the ribs between the four longitudinal bulkhead panels.

[0015] Step 5: Mount the longitudinal bulkhead assembly of section C onto the longitudinal bulkhead assembly of section B.

[0016] Furthermore, when the double-walled pipe passes between adjacent longitudinal bulkheads and there is a bend and the bend passes through the rib between the longitudinal bulkheads, the method also includes dividing the rib in the bend-passing area into an upper rib and a lower rib from the position where the double-walled pipe bends pass through. During installation, the lower rib is installed first, and the upper rib is installed after the double-walled pipe passing through the position above the lower rib is positioned.

[0017] Furthermore, when the double-walled tube passes between adjacent longitudinal bulkheads and there is a bend that passes through the rib between the longitudinal bulkheads, the longitudinal bulkhead on one side of the bend is first installed on the deck assembly. Then, after the double-walled tube passes through the longitudinal bulkhead, the lower rib is installed. Then, the longitudinal bulkhead on the other side of the bend is passed through the double-walled tube and installed on the deck assembly. The upper rib is then installed, and the upper rib is connected to the lower rib.

[0018] Furthermore, when there is no bend or the bend does not pass through the rib when the double-walled pipe passes between adjacent longitudinal bulkheads, the rib and longitudinal bulkhead are installed first, and then the double-walled pipe is installed in bulk.

[0019] Furthermore, prior to sandblasting and painting, structural reinforcement is also carried out on each assembly and longitudinal bulkhead.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention provides a top deck section for the fuel tank of a dual-fuel container ship, which centrally arranges the double-walled pipes, facilitating structural division of the deck section during construction.

[0022] 2. The present invention also provides a method for installing double-walled pipes in the top deck section of the fuel tank of a dual-fuel container ship. The structure is divided into different assemblies for construction, and the double-walled pipes are installed and the assemblies are assembled after sandblasting and coating, so as to avoid damage to the double-walled pipes.

[0023] 3. This invention solves the problem of not being able to assemble double-walled pipes with the bends by dividing the ribs in the area where double-walled pipe bends exist into upper and lower ribs. This reduces the installation difficulty of double-walled pipes, improves construction efficiency, and enables the pre-assembly of double-walled pipes in the segmented stage.

[0024] 4. This invention uses a reverse-state setup for deck assembly to install the longitudinal bulkhead assembly in the BB area where the double-walled tubes are located, which facilitates hoisting and avoids the difficulty of hoisting in confined spaces. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the segmented reverse-state placement of the top deck of the fuel tank of a dual-fuel container ship in an embodiment of the present invention.

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

[0027] Figure 3 is a schematic diagram of the assembly of the longitudinal bulkhead in section B of this invention.

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

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

[0030] Figure 6 is a schematic diagram of the structural reinforcement of the L-5 longitudinal bulkhead during the assembly of the longitudinal bulkhead in Area B.

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

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

[0033] Figure 9 is a schematic diagram of the connection between the upper rib and the lower rib in this invention.

[0034] In the diagram: 1. Deck section; 2. Double bulkhead; 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 bracing 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 bulkhead cover plate; 18. Upper section rib plate; 19. Lower section rib plate. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0036] A dual-fuel container ship fuel tank top deck section, taking a 13,000 TEU dual-fuel container ship as an example, as shown in Figure 1, the deck section in Figure 1 is mounted in reverse and includes deck section 1, longitudinal bulkhead, and double bulkhead tube 2; the longitudinal bulkhead is installed below deck section 1 and includes a first longitudinal bulkhead that spans the deck section and a second longitudinal bulkhead that does not span the deck section.

[0037] The first longitudinal bulkhead includes L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 arranged in parallel. The second longitudinal bulkhead includes 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 arranged in parallel. 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are located outside L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. The four longitudinal bulkheads are arranged in parallel. Ribs connect two adjacent longitudinal bulkheads. The ribs are arranged vertically perpendicular to the adjacent longitudinal bulkheads.

[0038] L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 are continuous bulkheads along the deck section, while 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are discontinuous longitudinal bulkheads along the deck section. 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are located near one end of L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 and close to deck section 1. A platform plate 7 is installed below 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6, and the platform plate 7 penetrates L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. The double-bulk pipe 2 passes sequentially through the overlapping area of ​​3874 longitudinal bulkhead 5, L-5 longitudinal bulkhead 3, L-6 longitudinal bulkhead 4, and 5694 longitudinal bulkhead 6, and the bends of the double-bulk pipe 2 are concentrated between L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. In this embodiment, eight double-walled tubes pass through four longitudinal bulkheads. Seven of the double-walled tubes have bends between L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4, and one double-walled tube has a bend between L-5 longitudinal bulkhead 3 and 3874 longitudinal bulkhead 5. The "above" and "below" mentioned above refer to the relative positions under the normal placement of the deck sections.

[0039] This embodiment also provides a method for installing double-walled tubes in the top deck section of the fuel tank of the above-mentioned dual-fuel container ship. 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.

[0040] The method includes the following steps:

[0041] 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.

[0042] 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.

[0043] As shown in Figure 2, the longitudinal bulkhead assembly of area A is integrally constructed 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 deck section 1.

[0044] Figure 3 shows the assembly of the longitudinal bulkheads in section B. Figure 3 is a schematic diagram of the assembly of the longitudinal bulkheads in section B, which were not yet assembled during the bulk manufacturing process.

[0045] The longitudinal bulkhead assembly in area C is shown in Figure 4. The platform plate, together with part of the L-5 longitudinal bulkhead and part of the L-6 longitudinal bulkhead, is pre-assembled together.

[0046] Preferably, prior to sandblasting and painting, structural reinforcement is also performed on each assembly and longitudinal bulkhead, specifically including:

[0047] The opening at the angle between the deck assembly and the longitudinal bulkhead assembly in area A is reinforced. The structural reinforcement includes longitudinal reinforcement 8, vertical reinforcement 9 and diagonal bracing reinforcement 10. Longitudinal reinforcement 8 is set parallel to the deck, vertical reinforcement 9 is set perpendicular to the deck, and diagonal bracing reinforcement 10 is inclinedly supported between longitudinal reinforcement 8 and vertical reinforcement 9, as shown in Figure 2.

[0048] The structural reinforcement of the longitudinal bulkhead assembly in section C is shown in Figure 4. A channel steel reinforcement 11 is installed at the lower opening of the longitudinal bulkhead assembly in section C. In this embodiment, all lower and upper openings refer to positions under normal conditions.

[0049] For the four longitudinal bulkheads assembled in Zone B, namely 3874 longitudinal bulkhead 12, L-5 longitudinal bulkhead 13, L-6 longitudinal bulkhead 14 and 5694 longitudinal bulkhead 15, it should be noted that 3874 longitudinal bulkhead 12 is essentially 3874 longitudinal bulkhead 5, 5694 longitudinal bulkhead is essentially 5694 longitudinal bulkhead 6, L-5 longitudinal bulkhead 13 is only a part of L-5 longitudinal bulkhead 3, and L-6 longitudinal bulkhead 14 is only a part of L-6 longitudinal bulkhead 4. As shown in Figures 5, 6, 7 and 8 respectively, an angle steel profile 16 is set at the upper and lower edges of 3874 longitudinal bulkhead 12, L-5 longitudinal bulkhead 13, L-6 longitudinal bulkhead 14 and 5694 longitudinal bulkhead 15, and the angle steel profile is welded to the non-structural surface of the longitudinal bulkhead, that is, the smooth surface. In addition, several vertical reinforcements 9 are welded between the angle steel profiles 16 perpendicular to the upper and lower edges, and are also installed on the non-structural surface.

[0050] Step 3: Sandblast and paint the four longitudinal bulkhead panels of the deck assembly, A-zone longitudinal bulkhead assembly, C-zone longitudinal bulkhead assembly, and B-zone longitudinal bulkhead assembly respectively. The reinforcing structure needs to be removed before each assembly is installed.

[0051] Step 4: Deck assembly reverse resting, bulk installation of the B-section longitudinal bulkhead assembly: Install the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly onto the deck assembly, pass the double bulkhead tubes through the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly, and install the ribs between the four longitudinal bulkhead panels.

[0052] In this embodiment, the double-walled pipe passes through the rib between the L-5 longitudinal bulkhead 13 and the L-6 longitudinal bulkhead 14 at the bend. First, the L-5 longitudinal bulkhead 13 and L-6 longitudinal bulkhead 14 are installed. During installation, the L-5 longitudinal bulkhead 13 is installed on the deck assembly (the L-6 longitudinal bulkhead can be installed first). Pipe holes for the double-walled pipe are provided on each of the four longitudinal bulkheads. Then, the double-walled pipe 2 passes through the pipe hole in the L-5 longitudinal bulkhead 13. Next, the rib between the L-5 longitudinal bulkhead 13 and the L-6 longitudinal bulkhead 14 is installed, and the L-5 longitudinal bulkhead... The ribs between 13 and L-6 longitudinal bulkhead 14 are divided into upper rib 18 and lower rib 19, as shown in Figure 9. First, the lower rib 19 is installed on the deck assembly, and then the L-6 longitudinal bulkhead 14 is installed. After the double-wall pipe 2 passes through the pipe hole of the L-6 longitudinal bulkhead 14, the L-6 longitudinal bulkhead 14 is positioned and fixed. Then the double-wall pipe 2 is positioned, and finally the upper rib 18 is installed. The upper rib 18 is installed above the lower rib 19 (here, "above" refers to the position above in the reverse state). The upper rib 18 and the lower rib 19 are connected vertically.

[0053] Since the double-walled pipes between 3874 longitudinal bulkhead 12 and L-5 longitudinal bulkhead 13 pass through the ribs without bends, and the double-walled pipes between 5694 longitudinal bulkhead 15 and L-6 longitudinal bulkhead 14 also pass through the ribs without bends, the ribs between 3874 longitudinal bulkhead 12 and L-5 longitudinal bulkhead 13, and between 5694 longitudinal bulkhead 15 and L-6 longitudinal bulkhead 14, do not need to be divided into upper and lower sections. Installation is further divided into two cases:

[0054] The first type: Although there are a few bends between the 3874 longitudinal bulkhead 12 and the L-5 longitudinal bulkhead 13, the area passing through the rib is not the bend area.

[0055] The second type: There are no bends and no double-walled pipes passing through the ribs between 5694 longitudinal bulkhead 15 and L-6 longitudinal bulkhead 14.

[0056] For the first scenario, the 3874 longitudinal bulkhead 12 can be installed on the deck assembly first, then the rib between the 3874 longitudinal bulkhead 12 and the L-5 longitudinal bulkhead 13 can be installed, and then the double-walled pipe 2 passing through the 3874 longitudinal bulkhead 12 can be installed to connect with the double-walled pipe passing through the L-5 longitudinal bulkhead 13. Since there is no bend, the double-walled pipe passing through the 3874 longitudinal bulkhead 12 can directly pass through the rib between the 3874 longitudinal bulkhead 12 and the L-5 longitudinal bulkhead 13.

[0057] In the second scenario, since no double-walled pipes pass through the ribs, the ribs between the 5694 longitudinal bulkhead 15 and the L-6 longitudinal bulkhead 14 can be pre-installed on the 5694 longitudinal bulkhead 15 or installed after the 5694 longitudinal bulkhead 6 is installed. The double-walled pipes passing through the 5694 longitudinal bulkhead 15 will be connected to the double-walled pipes passing through the L-6 longitudinal bulkhead 14 after the 5694 longitudinal bulkhead 15 is installed.

[0058] Step 5: Mount the C-section longitudinal bulkhead assembly onto the B-section longitudinal bulkhead assembly. The C-section longitudinal bulkhead assembly is installed using an interlocking method. To ensure smooth installation, the external dimensions of the C-section longitudinal bulkhead assembly can be reduced by 3-5mm during construction.

[0059] A double-walled tube cover plate 17 is also installed on the outside of the double-walled tube 2 that passes through the 3874 longitudinal bulkhead and the 5694 longitudinal bulkhead. The double-walled tube cover plate 17 is installed on the outside of the double-walled tube 2 and is welded to the 3874 longitudinal bulkhead 12 and the 5694 longitudinal bulkhead 15.

[0060] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A section of the top deck of the fuel tank of a dual-fuel container ship, characterized in that, It includes deck sections, longitudinal bulkheads, and double-walled tubes; the longitudinal bulkheads are installed below the deck sections, and include a first longitudinal bulkhead that spans the deck sections and a second longitudinal bulkhead that does not span the deck sections; 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 sections, and a platform plate is arranged below the second longitudinal bulkhead that penetrates the first longitudinal bulkhead; the double-walled tubes pass through the overlapping area of ​​the second and first longitudinal bulkheads, and the area through which the double-walled 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.

2. A method for installing a double-walled pipe within a section of the top deck of a dual-fuel container ship's fuel tank as described in claim 1, characterized in that, 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, A-zone longitudinal bulkhead assembly, C-zone longitudinal bulkhead assembly and B-zone longitudinal bulkhead assembly respectively. Step 4: Deck assembly reverse resting, bulk installation of the B-section longitudinal bulkhead assembly: Install the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly onto the deck assembly, pass the double bulkhead tubes through the four longitudinal bulkhead panels of the B-section longitudinal bulkhead assembly, and install the ribs between the four longitudinal bulkhead panels. Step 5: Mount the longitudinal bulkhead assembly of section C onto the longitudinal bulkhead assembly of section B.

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 2, characterized in that, When a double-walled pipe passes between adjacent longitudinal bulkheads and there is a bend that passes through a rib between the longitudinal bulkheads, the method further includes dividing the rib in the bend-passing area into an upper rib and a lower rib from the position where the double-walled pipe bends pass through. During installation, the lower rib is installed first, and the upper rib is installed after the double-walled pipe passing through the position above the lower rib is positioned.

4. 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 3, 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.

5. 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 3, 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.

6. 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 2, characterized in that, The process before sandblasting and painting also includes structural reinforcement of each assembly and longitudinal bulkhead.

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