Mounting method for top deck section and double-wall pipe of fuel cabin of dual-fuel container ship

Abstract

The invention relates to a mounting method for a top deck section and a double-wall pipe of a fuel cabin of a dual-fuel container ship. The deck section is divided into a deck assembly, an A-area longitudinal bulkhead assembly, a B-area longitudinal bulkhead assembly and a C-area longitudinal bulkhead assembly; the deck assemblage and the C-area longitudinal bulkhead assemblage are separately constructed, and the A-area longitudinal bulkhead assemblage is integrally constructed when the deck assemblage is constructed; longitudinal bulkheads in the B area are assembled and manufactured in bulk; sand washing and coating are conducted; mounting the B-area longitudinal bulkhead assemblage in bulk under the inverted placement of the deck assemblage: respectively mounting four longitudinal bulkhead plates of the B-area longitudinal bulkhead assemblage on the deck assemblage, enabling a double-wall pipe to penetrate through the four longitudinal bulkhead plates of the B-area longitudinal bulkhead assemblage, and mounting rib plates among the four longitudinal bulkhead plates; and the C-area longitudinal bulkhead assemblage is carried on the B-area longitudinal bulkhead assemblage. According to the method, the deck is segmented and divided into different assemblies for construction, after sand washing and coating are conducted, the double-wall pipe is installed, and the assemblies are folded and carried, so that the double-wall pipe is prevented from being damaged.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to a method for installing a top deck segment and a double-wall pipe of a fuel tank of a dual-fuel container ship. Background Art

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

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

[0004] In order to solve the problem of difficulty in installation of double-walled pipes passing through the longitudinal bulkhead area and also passing through ribs, the present invention provides a method for installing double-walled pipes and top deck sections of a fuel tank of a dual-fuel container ship, wherein the ribs at the integrated double-walled pipes are divided into upper ribs and lower ribs, and the double-walled pipes are installed after sandblasting and coating to avoid damage to the double-walled pipes.

[0005] The technical objectives of the present invention are achieved through the following technical solutions:

[0006] A dual-fuel container ship fuel tank top deck segment, comprising a deck segment, a longitudinal bulkhead, and a double-walled pipe; the longitudinal bulkhead is installed below the deck segment, and the longitudinal bulkhead comprises a first longitudinal bulkhead spanning the deck segment and a second longitudinal bulkhead not spanning the deck segment; at one end close to the first longitudinal bulkhead, the second longitudinal bulkhead is arranged parallel to the first longitudinal bulkhead and close to the deck segment, and a platform plate penetrating the first longitudinal bulkhead is arranged below the second longitudinal bulkhead; the double-walled pipe centrally passes through the second longitudinal bulkhead and the first longitudinal bulkhead from the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead, and the area where the double-walled pipe centrally passes through is located above the platform plate;

[0007] The first longitudinal bulkhead comprises two longitudinal bulkheads arranged in parallel, and the second longitudinal bulkhead comprises two longitudinal bulkheads arranged in parallel and arranged in parallel on the outsides of the two longitudinal bulkheads of the first longitudinal bulkhead;

[0008] Ribs are connected between two adjacent longitudinal bulkheads, and the ribs are vertically arranged perpendicular to the adjacent longitudinal bulkheads.

[0009] The present invention also provides a method for installing double-walled pipes in the top deck segment of a fuel tank of a dual-fuel container ship, wherein the longitudinal bulkhead is divided into zone A, zone B and zone C, the zone B is the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead, the zone C is the first longitudinal bulkhead area with a platform plate corresponding to the lower portion of zone B, and the zone A is the longitudinal bulkhead area outside zones B and C;

[0010] The method comprises the following steps:

[0011] Step 1: Divide the deck into deck assembly, A-area longitudinal bulkhead assembly, B-area longitudinal bulkhead assembly and C-area longitudinal bulkhead assembly;

[0012] Step 2: The deck assembly and the C-zone longitudinal bulkhead assembly are constructed separately, and the A-zone longitudinal bulkhead assembly is constructed as a whole during the deck assembly; the B-zone longitudinal bulkhead assembly is manufactured in bulk to form four longitudinal bulkhead plates and a number of double-walled tubes;

[0013] Step 3: sandblast and paint the four longitudinal bulkhead plates of the deck assembly, the A-area longitudinal bulkhead assembly, the C-area longitudinal bulkhead assembly and the B-area longitudinal bulkhead assembly respectively;

[0014] Step 4: The deck assembly is laid up in reverse state, and the longitudinal bulkhead assembly of area B is installed in bulk: the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B are installed on the deck assembly respectively, the double-wall pipe passes through the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B, and the ribs between the four longitudinal bulkhead plates are installed;

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

[0016] Furthermore, when there is an elbow when the double-walled tube passes between adjacent longitudinal bulkhead plates and the elbow passes through the ribs between the longitudinal bulkhead plates, the method also includes dividing the ribs in the area where the elbow passes into upper ribs and lower ribs from the position where the double-walled tube elbow passes, and installing the lower ribs first during installation, and installing the upper ribs after the double-walled tube passing through the position above the lower ribs is positioned.

[0017] Furthermore, when there is an elbow when the double-walled pipe passes between adjacent longitudinal bulkhead plates and the elbow passes through the ribs between the longitudinal bulkhead plates, the longitudinal bulkhead plate on one side of the elbow is first installed on the deck assembly, and then the double-walled pipe is passed through the longitudinal bulkhead plate, and the lower rib is installed, and then the longitudinal bulkhead plate on the other side of the elbow is passed through the double-walled pipe and installed on the deck assembly, and then the upper rib is installed, and the upper rib is butted up and down with the lower rib.

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

[0019] Furthermore, before sandblasting and painting, the structural reinforcement of each assembly and longitudinal bulkhead plate is also included.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention provides a dual-fuel container ship fuel tank top deck segment, which centrally arranges double-walled pipes and facilitates structural division of the deck segments during construction.

[0022] 2. The present invention also provides a method for installing double-walled pipes in the top deck segment of a fuel tank of a dual-fuel container ship, which divides the structure into different assemblies for construction, and then installs the double-walled pipes and closes and loads the assemblies after sandblasting and painting, thereby avoiding damage to the double-walled pipes.

[0023] 3. The present invention divides the ribs in the area where the double-walled pipe elbows exist into upper ribs and lower ribs, thereby solving the problem that the double-walled pipe cannot be assembled with the elbows due to the existence of the double-walled pipe elbows, reducing the difficulty of installing the double-walled pipe, which is beneficial to improving the construction efficiency and realizing the pre-installation of the double-walled pipe in the segmented stage.

[0024] 4. The present invention installs the longitudinal bulkhead assembly of the BB area where the double-walled pipe is located through the reverse arrangement of the deck assembly, which is convenient for hoisting and avoids the difficulty of hoisting in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of reverse lay-up of the top deck of the fuel tank of a dual-fuel container ship in sections according to an embodiment of the present invention.

[0026] Figure 2 It is a schematic diagram of the integrated construction of the deck assembly and the A-zone longitudinal bulkhead assembly in the present invention.

[0027] Figure 3 It is a schematic diagram of the assembly composition of the longitudinal bulkhead in zone B of the present invention.

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

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

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

[0031] Figure 7 Schematic diagram of the structural reinforcement of the L-6 longitudinal bulkhead plate in the B zone longitudinal bulkhead assembly.

[0032] Figure 8 Schematic diagram of the structural reinforcement of the 5694 longitudinal bulkhead plate in the longitudinal bulkhead assembly of area B.

[0033] Fig. 9 It is a schematic diagram of the butt joint between the upper rib plate and the lower rib plate in the present invention.

[0034] In the figure:

[0035] 1. Deck sections; 2. Double-walled tubes; 3. L-5 longitudinal bulkheads; 4. L-6 longitudinal bulkheads; 5. 3874 longitudinal bulkheads; 6. 5694 longitudinal bulkheads; 7. Platform plates; 8. Longitudinal reinforcement; 9. Vertical reinforcement; 10. Diagonal brace reinforcement; 11. Channel steel reinforcement; 12. 3874 longitudinal bulkhead plating; 13. L-5 longitudinal bulkhead plating; 14. L-6 longitudinal bulkhead plating; 15. 5694 longitudinal bulkhead plating; 16. Angle steel profiles; 17. Double-walled tube sheathing; 18. Upper ribs; 19. Lower ribs. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0037] A dual-fuel container ship fuel tank top deck segmentation, taking a 13,000-box dual-fuel container ship as an example, Figure 1 As shown, Figure 1 The middle deck section is laid up in reverse state, including the deck section 1, the longitudinal bulkhead, and the double-walled tube 2; the longitudinal bulkhead is installed below the deck section 1, and the longitudinal bulkhead includes the first longitudinal bulkhead spanning the deck section and the second longitudinal bulkhead not spanning the deck section;

[0038] The first longitudinal bulkhead includes L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 which are arranged in parallel, and the second longitudinal bulkhead includes 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 which are arranged in parallel. 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6 are located on the outer sides of L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. Four longitudinal bulkheads are arranged in parallel, and ribs are connected between two adjacent longitudinal bulkheads. The ribs are vertically arranged perpendicular to the adjacent longitudinal bulkheads.

[0039] L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 are continuous 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 close to one end of L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4 and close to deck section 1; platform plate 7 is arranged below 3874 longitudinal bulkhead 5 and 5694 longitudinal bulkhead 6, and platform plate 7 passes through L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4; double-walled pipe 2 passes through the overlapping area of ​​3874 longitudinal bulkhead 5, L-5 longitudinal bulkhead 3, L-6 longitudinal bulkhead 4 and 5694 longitudinal bulkhead 6 in sequence, and the elbows of double-walled pipe 2 are concentratedly arranged between L-5 longitudinal bulkhead 3 and L-6 longitudinal bulkhead 4. In this embodiment, the eight double-walled tubes pass through four longitudinal bulkheads, among which the elbows of seven double-walled tubes are between the L-5 longitudinal bulkhead 3 and the L-6 longitudinal bulkhead 4, and the elbow of one double-walled tube is between the L-5 longitudinal bulkhead 3 and the 3874 longitudinal bulkhead 5. The above-mentioned upper and lower parts are relative positions when the deck sections are placed normally.

[0040] This embodiment also provides a method for installing double-walled pipes in the top deck segment of the fuel tank of the dual-fuel container ship, wherein the longitudinal bulkhead is divided into zone A, zone B and zone C, zone B is the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead, zone C is the first longitudinal bulkhead area with a platform plate corresponding to the lower portion of zone B, and zone A is the longitudinal bulkhead area outside zones B and C;

[0041] The method comprises the following steps:

[0042] Step 1: Divide the deck into deck assembly, A-area longitudinal bulkhead assembly, B-area longitudinal bulkhead assembly and C-area longitudinal bulkhead assembly;

[0043] Step 2: The deck assembly and the C-zone longitudinal bulkhead assembly are constructed separately, and the A-zone longitudinal bulkhead assembly is constructed as a whole during the deck assembly; the B-zone longitudinal bulkhead assembly is manufactured in bulk to form four longitudinal bulkhead plates and a number of double-walled tubes;

[0044] like Figure 2 As shown, the A-zone longitudinal bulkhead assembly 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 the deck section 1.

[0045] The longitudinal bulkhead assembly in zone B is as follows Figure 3 As shown, Figure 3 This is a schematic diagram of the assembly composition of the longitudinal bulkhead in area B, which has not been assembled during bulk production.

[0046] C zone longitudinal bulkhead assembly Figure 4 As shown, 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 a preferred method, before sandblasting and painting, the structural reinforcement of each assembly and longitudinal bulkhead plate is also included, including:

[0048] The opening position of the angle between the deck assembly and the longitudinal bulkhead assembly in zone A is strengthened. The structural strengthening includes longitudinal reinforcement 8, vertical reinforcement 9 and diagonal brace reinforcement 10. The longitudinal reinforcement 8 is arranged parallel to the deck, the vertical reinforcement 9 is arranged perpendicular to the deck, and the diagonal brace reinforcement 10 is inclinedly supported between the longitudinal reinforcement 8 and the vertical reinforcement 9. Figure 2 shown.

[0049] The structural reinforcement of the longitudinal bulkhead assembly in zone C is as follows: Figure 4 As shown, a channel steel reinforcement 11 is arranged at the lower opening of the longitudinal bulkhead assembly in zone C. In this embodiment, all lower openings and upper openings refer to the positions in the normal state.

[0050] For the four longitudinal bulkhead plates assembled in the longitudinal bulkhead of zone B, they are 3874 longitudinal bulkhead plate 12, L-5 longitudinal bulkhead plate 13, L-6 longitudinal bulkhead plate 14 and 5694 longitudinal bulkhead plate 15. It should be noted that 3874 longitudinal bulkhead plate 12 is essentially 3874 longitudinal bulkhead 5, 5694 longitudinal bulkhead plate is essentially 5694 longitudinal bulkhead 6, while L-5 longitudinal bulkhead plate 13 is only a part of L-5 longitudinal bulkhead 3, and L-6 longitudinal bulkhead plate 14 is only a part of L-6 longitudinal bulkhead 4; respectively as follows Figure 5 , 6 As shown in FIGS. 7 and 8, an angle steel profile 16 is respectively arranged at the upper and lower edges 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, and the angle steel profile is welded to the non-structural surface, i.e., the smooth surface, of the longitudinal bulkhead plate. In addition, a number of 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.

[0051] Step 3: sandblast and paint the four longitudinal bulkhead plates of the deck assembly, A zone longitudinal bulkhead assembly, C zone longitudinal bulkhead assembly and B zone longitudinal bulkhead assembly respectively. The strengthening structure needs to be removed before the installation of each assembly.

[0052] Step 4: The deck assembly is laid up in reverse state, and the longitudinal bulkhead assembly of area B is installed in bulk: the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B are installed on the deck assembly respectively, the double-wall pipe passes through the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B, and the ribs between the four longitudinal bulkhead plates are installed;

[0053] In this embodiment, the double-walled pipe passes through the rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 at the elbow. The L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 are installed first. During installation, the L-5 longitudinal bulkhead plate 13 is installed on the deck assembly (the L-6 longitudinal bulkhead plate can be installed first). The four longitudinal bulkhead plates are respectively provided with pipe holes for the double-walled pipe to pass through. Then, the double-walled pipe 2 passes through the pipe holes of the L-5 longitudinal bulkhead plate 13, and then the rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 is installed. The rib plate between the L-5 longitudinal bulkhead plate 13 and the L-6 longitudinal bulkhead plate 14 is divided into an upper rib plate 18 and a lower rib plate 19, as shown in FIG. Fig. 9 As shown, first install the lower rib 19 on the deck assembly, then install the L-6 longitudinal bulkhead plate 14, pass the double-walled pipe 2 through the pipe hole of the L-6 longitudinal bulkhead plate 14, position and fix the L-6 longitudinal bulkhead plate 14, then position the double-walled pipe 2, and finally install the upper rib 18. The upper rib 18 is installed above the lower rib 19 (the upper position here is the upper position in the inverted state), and the upper rib 18 and the lower rib 19 are butted up and down.

[0054] Since the double-walled pipe between the 3874 longitudinal bulkhead 12 and the L-5 longitudinal bulkhead plate 13 has no elbow passing through the rib plate, and the double-walled pipe between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14 has no elbow passing through the rib plate, 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 upper and lower sections. There are two situations during installation:

[0055] The first type: Although there are a few elbows between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13, the area passing through the rib plate is not an elbow area;

[0056] The second type: there is no elbow between the 5694 longitudinal bulkhead plate 15 and the L-6 longitudinal bulkhead plate 14, and no double-walled 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, and then the ribs between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13 can be installed, and then the double-walled pipe 2 passing through the 3874 longitudinal bulkhead plate 12 can be installed to connect with the double-walled pipe passing through the L-5 longitudinal bulkhead plate 13. Since there is no elbow, the double-walled pipe passing through the 3874 longitudinal bulkhead plate 12 can directly pass through the ribs between the 3874 longitudinal bulkhead plate 12 and the L-5 longitudinal bulkhead plate 13.

[0058] For the second case, since there is no double-walled pipe passing 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 5694 longitudinal bulkhead 6 is installed. The double-walled pipe passing through the 5694 longitudinal bulkhead plate 15 is connected with the double-walled pipe passing through the L-6 longitudinal bulkhead plate 14 after the 5694 longitudinal bulkhead plate 15 is installed.

[0059] Step 5: Mount the C zone longitudinal bulkhead assembly on the B zone longitudinal bulkhead assembly. The C zone longitudinal bulkhead assembly is installed by patching. To ensure smooth installation, the external dimensions of the C zone longitudinal bulkhead assembly can be reduced by 3-5mm in advance during construction.

[0060] A double-walled tube covering plate 17 is also installed on the outside of the double-walled tube passing through the 3874 longitudinal bulkhead plate and the 5694 longitudinal bulkhead plate. The double-walled tube covering plate 17 is installed on the outside of the double-walled tube 2 and is welded to the 3874 longitudinal bulkhead plate 12 and the 5694 longitudinal bulkhead plate 15 through the double-walled tube covering plate 17.

[0061] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. A dual-fuel container ship fuel tank top deck segment, characterized in that: It comprises a deck section, a longitudinal bulkhead, and a double-walled tube; the longitudinal bulkhead is installed below the deck section, and the longitudinal bulkhead comprises a first longitudinal bulkhead spanning the deck section and a second longitudinal bulkhead not spanning the deck section; at one end close to the first longitudinal bulkhead, the second longitudinal bulkhead is arranged parallel to the first longitudinal bulkhead and close to the deck section, and a platform plate penetrating the first longitudinal bulkhead is arranged below the second longitudinal bulkhead; the double-walled tube centrally passes through the second longitudinal bulkhead and the first longitudinal bulkhead from the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead, and the area where the double-walled tube centrally passes through is located above the platform plate; The first longitudinal bulkhead comprises two longitudinal bulkheads arranged in parallel, and the second longitudinal bulkhead comprises two longitudinal bulkheads arranged in parallel and arranged in parallel on the outsides of the two longitudinal bulkheads of the first longitudinal bulkhead; Ribs are connected between two adjacent longitudinal bulkheads, and the ribs are vertically arranged perpendicular to the adjacent longitudinal bulkheads.

2. A method for installing double-walled pipes in the top deck segment of a dual-fuel container ship fuel tank as claimed in claim 1, characterized in that: The longitudinal bulkhead is divided into area A, area B and area C, the area B is the overlapping area of ​​the second longitudinal bulkhead and the first longitudinal bulkhead, the area C is the area of ​​the first longitudinal bulkhead with the platform plate below the area B, and the area A is the area of ​​the longitudinal bulkhead outside the areas B and C; The method comprises the following steps: Step 1: Divide the deck into deck assembly, A-area longitudinal bulkhead assembly, B-area longitudinal bulkhead assembly and C-area longitudinal bulkhead assembly; Step 2: The deck assembly and the C-zone longitudinal bulkhead assembly are constructed separately, and the A-zone longitudinal bulkhead assembly is constructed as a whole during the deck assembly; the B-zone longitudinal bulkhead assembly is manufactured in bulk to form four longitudinal bulkhead plates and a number of double-walled tubes; Step 3: sandblast and paint 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 respectively; Step 4: The deck assembly is laid up in reverse state, and the longitudinal bulkhead assembly of area B is installed in bulk: the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B are installed on the deck assembly respectively, the double-wall pipe passes through the four longitudinal bulkhead plates of the longitudinal bulkhead assembly of area B, and the ribs between the four longitudinal bulkhead plates are installed; Step 5: Mount the C zone longitudinal bulkhead assembly on the B zone longitudinal bulkhead assembly.

3. The method for installing double-walled pipes in the top deck sections of a dual-fuel container ship fuel tank according to claim 2, characterized in that: When a double-walled tube has an elbow when passing between adjacent longitudinal bulkhead plates and the elbow passes through a rib between the longitudinal bulkhead plates, the method further includes dividing the rib in the area where the elbow passes into an upper rib and a lower rib from the position where the double-walled tube elbow passes, and installing the lower rib first during installation, and installing the upper rib after positioning of the double-walled tube passing through the position above the lower rib is completed.

4. The method for installing double-walled pipes in the top deck segment of a dual-fuel container ship fuel tank according to claim 3, characterized in that: When there is an elbow when the double-walled pipe passes between adjacent longitudinal bulkhead plates and the elbow passes through the ribs between the longitudinal bulkhead plates, first install the longitudinal bulkhead plate on one side of the elbow on the deck assembly, then install the lower rib after the double-walled pipe passes through the longitudinal bulkhead plate, and then install the longitudinal bulkhead plate on the other side of the elbow on the deck assembly after passing through the double-walled pipe, and then install the upper rib, and the upper rib is butted up and down with the lower rib.

5. The method for installing double-walled pipes in the top deck sections of a dual-fuel container ship fuel tank according to claim 3, characterized in that: When double-walled pipes pass between adjacent longitudinal bulkhead plates without elbows or the elbows do not pass through ribs, install ribs and longitudinal bulkhead plates first and then install double-walled pipes in bulk.

6. The method for installing double-walled pipes in the top deck segment of a dual-fuel container ship fuel tank according to claim 2, characterized in that: Before sandblasting and painting, the structural reinforcement of each assembly and longitudinal bulkhead plate is also included.

Images