A method for hoisting and installing a process opening of a dual fuel tank

Abstract

The present application relates to a kind of double-fuel tank process hole hoisting construction method, which comprises installing lifting ring during the construction of double-fuel tank, carrying out inner fuel tank tightness test and outer fuel tank tightness test after the completion of double-fuel tank integrity construction;According to the cutting sequence of process hole, form outer shell process hole segment and inner shell process hole segment, hoist outer shell process hole segment to total assembly platform by lifting appliance, hoist inner shell process hole segment to outer fuel tank, after the completion of inner enclosure system construction, hoist inner shell process hole segment and outer shell process hole segment to the original position and install them again.The installation of lifting ring before integrity construction in the present application reduces the workload of subsequent process and the damage to paint, and also avoids overhead welding operation;Inner shell process hole segment is placed in outer fuel tank, which avoids moving it out of the hull plate completely, and reduces a large amount of hoisting workload.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding, in particular to a double-fuel tank process hole hoisting construction method. BACKGROUND

[0002] A four-layer tank wall structure is arranged on the periphery of the double-fuel tank container ship. The fuel tank needs to be completely constructed during construction. After the fuel tank tightness test is completed, process holes are opened on the tank wall of the fuel tank for the construction of the fuel tank enclosure system. After the completion of the enclosure system construction, the process holes are closed. The prior art, such as the invention patent application with the publication number CN116142409A, discloses a construction method for a fuel tank in a single-shell state. After the completion of the total assembly of the fuel tank, a complete tank is formed. The tank is inflated for tightness test. After the completion of the tightness test, a tank wall process hole is opened on the side to perform internal sanding and coating operations and enclosure system construction. After the completion of the enclosure system construction, the tank wall process hole is closed.

[0003] For a double-fuel tank, the outer part of the fuel tank has a four-layer tank wall. The space between the inner two-layer tank wall and the outer two-layer tank wall is the outer tank of the fuel tank. Therefore, process holes need to be opened in the four-layer tank wall to form two process hole segments inside and outside. After the opening is completed, the opened process hole segments need to be removed and reinstalled after the completion of the enclosure system construction. Compared with a single process hole segment, the construction difficulty and workload are relatively large. SUMMARY

[0004] In order to reduce the construction difficulty and workload of the process hole segment of the double-fuel tank, the present application provides a double-fuel tank process hole hoisting construction method. The lifting ring is installed in advance. After the completion of the double-fuel tank construction, the inner shell process hole segment is hoisted into the outer fuel tank, and the outer shell process hole segment is hoisted onto the total assembly platform. After the completion of the enclosure system construction, the process hole segment is reinstalled.

[0005] The technical purpose of the present application is achieved by the following technical scheme:

[0006] A double-fuel tank process hole hoisting construction method, the method comprising:

[0007] Step 1, constructing a double-fuel tank, the double-fuel tank comprising an inner fuel tank and an outer fuel tank, the tank wall between the inner fuel tank and the outer fuel tank comprising an inner fuel tank wall and a first outer fuel tank wall; the tank wall between the outer fuel tank and the outer side of the ship body comprising a second outer fuel tank wall and an outer plate; the inner fuel tank wall and the first outer fuel tank wall are connected by a rib plate, and the second outer fuel tank wall and the outer plate are connected by a rib plate;

[0008] During construction, lifting rings are pre-installed on the inner fuel tank wall, the first outer fuel tank wall, the second outer fuel tank wall, the outer plate, and the ribs according to the location of the process openings.

[0009] Step 2: After the dual fuel tank integrity construction is completed, conduct a tightness test on the inner fuel tank and a tightness test on the outer fuel tank.

[0010] Step 3: Cut the process holes according to their opening positions to form the outer shell process hole segment. The outer shell process hole segment includes the second outer fuel tank wall, the outer plate, and the rib plate set between the second outer fuel tank wall and the outer plate. Use the lifting rings of the outer shell process hole segment connected by the lifting equipment to lift the outer shell process hole segment to the assembly platform.

[0011] Step 4: Cut the process hole according to its location to form an inner shell process hole segment. The inner shell process hole segment includes an inner fuel tank wall, a first outer fuel tank wall, and a rib plate disposed between the inner fuel tank wall and the first outer fuel tank wall. Use a lifting device to connect the lifting ring of the inner shell process hole segment to the outer fuel tank to lift the inner shell process hole segment into the outer fuel tank.

[0012] Step 5: After the construction of the inner fuel tank and / or outer fuel tank containment system is completed, hoist the inner shell process hole segment and the outer shell process hole segment to their original positions and reinstall them in sequence.

[0013] Furthermore, within the range of the process hole opening on the side of the inner fuel tank wall near the first outer fuel tank wall, a first inner shell process hole lifting ring is installed on both sides of the upper end of the range of the process hole opening, and a second inner shell process hole lifting ring is installed on both sides of the lower end of the range of the process hole opening.

[0014] Furthermore, within the process hole opening range on the side of the first outer fuel tank wall near the inner fuel tank wall, third inner shell process hole lifting rings are installed on both sides of the upper end of the process hole opening range; outside the process hole opening range on the side of the first outer fuel tank wall near the second outer fuel tank wall, fourth inner shell process hole lifting rings are installed on both sides of the lower end of the process hole opening range; an inner shell process hole reinforcement is connected between the inner fuel tank wall and the first outer fuel tank wall, and the inner shell process hole reinforcement is located within the process hole opening range near the lower end of the process hole opening range.

[0015] Furthermore, a fifth inner shell process hole lifting ring is installed on the rib between the inner fuel tank wall and the first outer fuel tank wall. The fifth inner shell process hole lifting ring is installed on the ribs closest to the edge of the process hole opening range on both sides outside the process hole opening range and is located above the process hole opening range.

[0016] Furthermore, within the range of the process opening on the side of the second outer fuel tank wall near the outer plate, a first outer shell process opening lifting ring is installed on both sides near the middle of the process opening height, and a second outer shell process opening lifting ring is installed on both sides near the lower end of the process opening; a fifth outer shell process opening lifting ring is installed above the range of the process opening on the side of the second outer fuel tank wall near the first outer fuel tank wall.

[0017] Furthermore, a fourth outer shell process hole lifting ring is installed on both sides outside the process hole opening range on the side of the outer plate near the second outer fuel tank wall, with the fourth outer shell process hole lifting ring positioned near the lower end of the process hole opening range; a third outer shell process hole lifting ring is installed on both sides near the upper end of the process hole opening range on the other side of the outer plate; an outer shell process hole reinforcement is connected between the outer plate and the second outer fuel tank wall, with the outer shell process hole reinforcement located within the process hole opening range; the fourth outer shell process hole lifting ring is higher than the outer shell process hole reinforcement.

[0018] Furthermore, a sixth outer shell process hole lifting ring is installed on the rib between the second outer fuel tank wall and the outer plate. The sixth outer shell process hole lifting ring is installed on the ribs closest to the edge of the process hole opening range on both sides outside the process hole opening range and is located above the process hole opening range.

[0019] Furthermore, the lifting equipment includes hand chain hoists and cranes;

[0020] When lifting the process hole segment of the outer shell to the main assembly platform using the lifting rings connected to the lifting tool:

[0021] Hang the chain hoist at the sixth outer shell process hole lifting ring, connect the hook of the chain hoist to the first outer shell process hole lifting ring, then cut the outer shell process hole segment, and pour the outer shell process hole segment into the outer fuel tank. During the pouring process, a person pulls the chain of the chain hoist so that the outer shell process hole segment is gradually poured into the outer fuel tank.

[0022] After the outer shell process hole segment is completely tilted, hang the hand chain hoist at the fourth outer shell process hole lifting ring. Connect the hook of the hand chain hoist to the second outer shell process hole lifting ring, and pull the chain of the hand chain hoist to move the outer shell process hole segment to the outside of the outer plate.

[0023] Connect the crane hook to the third outer shell process hole lifting ring and lift the outer shell process hole segment to the main assembly platform;

[0024] During the hoisting, repositioning, and installation process in step 5:

[0025] First, the outer shell process hole segment is lifted to the outer plate using the crane hook and the third outer shell process hole lifting ring;

[0026] Then, the chain hoist is hung on the fourth outer shell process hole lifting ring, and the hook of the chain hoist is connected to the second outer shell process hole lifting ring. Pulling the chain hoist's chain causes the outer shell process hole segment to move into the outer fuel tank.

[0027] Hang the chain hoist at the sixth process hole ring of the outer casing, and connect the hook of the chain hoist to the first process hole ring of the outer casing. Pull the chain hoist to make the outer casing segment rotate 90 degrees and reset.

[0028] Furthermore, the lifting equipment includes a hand chain hoist;

[0029] When lifting the inner shell process hole segment into the outer fuel tank using the lifting rings connected to the lifting equipment:

[0030] The hand chain hoist is suspended at the fifth inner shell process hole lifting ring, and the hook of the hand chain hoist is connected to the first inner shell process hole lifting ring. Then, the inner shell process hole segment is cut and the inner shell process hole segment is tilted into the inner fuel tank. During the tilting process, the chain of the hand chain hoist is pulled so that the inner shell process hole segment is gradually tilted into the inner fuel tank.

[0031] After the inner shell process hole segment is completely tilted, suspend the hand chain hoist at the fourth inner shell process hole lifting ring, connect the hook of the hand chain hoist to the second inner shell process hole lifting ring, and pull the chain of the hand chain hoist to move the inner shell process hole segment into the outer fuel tank.

[0032] A hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring of the third inner shell process hole to completely lift the inner shell process hole segment into the outer fuel tank.

[0033] During the hoisting, repositioning, and installation process in step 5:

[0034] A hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring of the third inner shell process hole to completely lift the inner shell process hole segment close to the first outer fuel tank wall.

[0035] Suspend the chain hoist at the fourth inner shell process hole lifting ring, connect the hook of the chain hoist to the second inner shell process hole lifting ring, and pull the chain of the chain hoist to move the inner shell process hole segment into the fuel tank.

[0036] After the inner shell process hole plate is moved to the inner fuel tank, the hand chain hoist is suspended at the fifth inner shell process hole lifting ring. The hook of the hand chain hoist is connected to the first inner shell process hole lifting ring. Pulling the chain of the hand chain hoist causes the inner shell process hole plate to rotate 90 degrees and reset.

[0037] Compared with the prior art, the beneficial effects of the present invention are that the installation of the lifting rings before the complete construction reduces the workload of subsequent processes and the damage to the paint. At the same time, since the lifting rings are installed before the completion of the complete construction, the overhead welding operation is avoided when cutting process holes later. The process hole segments of the inner shell are placed in the outer fuel tank, avoiding the complete removal of them from the outer plate, which reduces a lot of lifting work. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the dual-fuel tank side area structure in this invention.

[0039] Figure 2 yes Figure 1 AA view in the middle.

[0040] Figure 3 yes Figure 1 BB view in the middle.

[0041] Figure 4 This is a schematic diagram showing the rib arrangement between the inner fuel tank wall and the first outer fuel tank wall.

[0042] Figure 5 yes Figure 1 The CC view in the middle.

[0043] Figure 6 yes Figure 1 DD view in the middle.

[0044] Figure 7 This is a schematic diagram showing the rib arrangement between the second outer fuel tank bulkhead and the outer plate.

[0045] Figure 8 This is a schematic diagram of the reinforcement setting of the inner shell process hole in this invention.

[0046] Figure 9 This is a schematic diagram of the reinforcement setting of the process hole in the outer shell in this invention.

[0047] Figure 10 This is a schematic diagram of the installation of the lifting device at the sixth outer shell process hole lifting ring in this invention.

[0048] Figure 11 This is a schematic diagram of the installation of the lifting device at the fourth outer shell process hole lifting ring in this invention.

[0049] Figure 12 This is a schematic diagram of the connection between the lifting ring and the lifting device in the third outer shell process hole of the present invention.

[0050] Figure 13 This is a schematic diagram of the installation of the lifting device at the lifting ring of the fifth inner shell process hole in this invention.

[0051] Figure 14This is a schematic diagram of the installation of the lifting device at the lifting ring of the fourth inner shell process hole in this invention.

[0052] Figure 15 This is a schematic diagram of the connection between the lifting ring and the lifting device in the third inner shell process hole of the present invention.

[0053] In the diagram, 1. Inner fuel tank; 2. Inner fuel tank wall; 3. First outer fuel tank wall; 4. Second outer fuel tank wall; 5. Outer fuel tank; 6. Outer plate; 7. Inner shell process hole segment; 8. Outer shell process hole segment; 9. First inner shell process hole lifting ring; 10. Second inner shell process hole lifting ring; 11. Third inner shell process hole lifting ring; 12. Fourth inner shell process hole lifting ring; 13. Fifth inner shell process hole lifting ring; 14. Inner shell process hole reinforcement; 15. First outer shell process hole lifting ring; 16. Second outer shell process hole lifting ring; 17. Third outer shell process hole lifting ring; 18. Fourth outer shell process hole lifting ring; 19. Rib plate; 20. Outer shell process hole reinforcement; 21. Fifth outer shell process hole lifting ring; 22. Sixth outer shell process hole lifting ring. Detailed Implementation

[0054] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0055] A method for hoisting and constructing a process port in a dual-fuel tank, the method comprising:

[0056] Step 1: Construct a dual-fuel tank, such as... Figure 1 As shown, the dual fuel tank includes an inner fuel tank 1 and an outer fuel tank 5. In this embodiment, the inner fuel tank is used to store natural gas, and the outer fuel tank stores fuel oil. The bulkhead between the inner fuel tank 1 and the outer fuel tank 5 includes an inner fuel tank bulkhead 2 and a first outer fuel tank bulkhead 3. The bulkhead between the outer fuel tank 5 and the outer side of the hull includes a second outer fuel tank bulkhead 4 and an outer plate 6. Ribs 19 connect the inner fuel tank bulkhead 2 and the first outer fuel tank bulkhead 3, and ribs 19 connect the second outer fuel tank bulkhead 4 and the outer plate 6.

[0057] During construction, lifting rings are pre-installed on the inner fuel tank wall 2, the first outer fuel tank wall 3, the second outer fuel tank wall 4, the outer plate 6, and the rib plate 19 according to the location of the process holes. In this embodiment, the five special meanings of "first", "second", "third", "fourth", "fifth" and "sixth" are used only for structural distinction.

[0058] The location of the process workshop is determined based on the height of the scaffolding platform constructed by the enclosure system, to facilitate the transportation of personnel and materials.

[0059] Specifically, on the inner fuel tank wall, such as Figure 2As shown, the inner fuel tank wall 2 has a smooth surface on one side inside the inner fuel tank, and a frame surface on the side of the inner fuel tank near the first outer fuel tank wall. Within the process hole opening range, lifting rings are installed on the frame surface of the inner fuel tank wall 2. Specifically, a first inner shell process hole lifting ring 9 is installed on the left and right sides of the upper end near the process hole opening range, and a second inner shell process hole lifting ring 10 is installed on the left and right sides of the lower end near the process hole opening range.

[0060] Specifically, on the first outer fuel tank bulkhead 3, such as Figure 3 As shown, the side of the first outer fuel tank wall 3 closest to the inner fuel tank wall 2 is a frame surface, and the other side of the first outer fuel tank wall 3 is a smooth surface. Within the process hole opening range of the frame surface of the first outer fuel tank wall 3, a third inner shell process hole lifting ring 11 is installed on the left and right sides of the upper end of the process hole opening range, respectively; on the smooth surface of the first outer fuel tank wall 3, a fourth inner shell process hole lifting ring 12 is installed outside the process hole opening range, specifically on the left and right sides of the lower end of the process hole opening range.

[0061] As a preferred option, such as Figure 3 and Figure 8 As shown, an inner shell process hole reinforcement 14 is connected between the inner fuel tank wall 2 and the first outer fuel tank wall 3. The inner shell process hole reinforcement 14 is located within the process hole opening range and is positioned near the lower end of the process hole opening range. In this embodiment, the inner shell process hole reinforcement 14 consists of two parallel channel steels. The installation height of the inner shell process hole reinforcement 14 is lower than the height of the fourth inner shell process hole lifting ring 12. By setting the inner shell process hole reinforcement 14, deformation of the inner shell process hole segment 7 during the cutting process is avoided.

[0062] Specifically, a fifth inner shell process hole lifting ring 13 is installed on the rib 19 between the inner fuel tank wall 2 and the first outer fuel tank wall 3, such as... Figure 4 As shown, the fifth inner shell process hole lifting ring 13 is installed on the ribs 19 closest to the edge of the process hole opening range on both sides outside the process hole opening range and is located above the process hole opening range.

[0063] Specifically, on the second outer fuel tank bulkhead, such as Figure 5As shown, the side of the second outer fuel tank wall 4 closest to the outer plate 6 is the frame surface, and the other side of the second outer fuel tank wall 4 is the smooth surface; within the process hole opening range of the frame surface of the second outer fuel tank wall 4, a first outer shell process hole lifting ring 15 is installed on both sides near the middle of the height of the process hole opening range, and a second outer shell process hole lifting ring 16 is installed on both sides near the lower end of the process hole opening range; a fifth outer shell process hole lifting ring 21 is installed outside the process hole opening range of the smooth surface of the second outer fuel tank wall 4, specifically, the fifth outer shell process hole lifting ring 21 is installed above the process hole opening range.

[0064] Specifically, on outer panel 6, such as Figure 6 As shown, the side of the outer plate 6 closest to the second outer fuel tank bulkhead 4 is the frame surface, while the other side of the outer plate 6 is the smooth surface located outside the ship. A fourth outer shell process hole lifting ring 18 is installed outside the process hole opening range of the frame surface of the outer plate 6, and the fourth outer shell process hole lifting ring 18 is located on the left and right sides near the lower end of the process hole opening range. A third outer shell process hole lifting ring 17 is installed on the smooth surface of the outer plate 6, and the third outer shell process hole lifting ring 17 is located within the process hole opening range and is located on the left and right sides near the upper end of the process hole opening range.

[0065] As a preferred option, such as Figure 6 and Figure 9 As shown, a shell process hole reinforcement 20 is connected between the outer plate 6 and the second outer fuel tank wall 4. The shell process hole reinforcement 20 is located within the process hole opening range. The fourth shell process hole lifting ring 18 is higher than the shell process hole reinforcement 20. In this embodiment, the shell process hole reinforcement 20 consists of two parallel channel steels. The shell process hole reinforcement 20 is used to prevent deformation when the shell process hole segment is cut.

[0066] Specifically, a sixth outer shell process hole lifting ring 22 is installed on the rib 19 between the second outer fuel tank bulkhead 4 and the outer plate 6, such as Figure 7 As shown, the sixth outer shell process hole lifting ring 22 is installed on the ribs 19 closest to the edge of the process hole opening range on both sides outside the process hole opening range and is located above the process hole opening range.

[0067] Step 2: After the dual fuel tank integrity construction is completed, conduct a tightness test on the inner fuel tank and a tightness test on the outer fuel tank. The tightness test is conducted by filling with air, and the pressure fluctuation is checked after filling to determine whether the tightness meets the requirements.

[0068] Step 3: Cut the process hole according to the opening position to form the outer shell process hole segment 8. The outer shell process hole segment 8 includes the second outer fuel tank wall 4, the outer plate 6 and the rib 19 disposed between the second outer fuel tank wall 4 and the outer plate 6; use the lifting ring of the outer shell process hole segment connected by the lifting equipment to lift the outer shell process hole segment to the assembly platform.

[0069] Specifically, such as Figure 10 As shown, a chain hoist is hung at the sixth outer shell process hole lifting ring 22, and the hook of the chain hoist is connected to the first outer shell process hole lifting ring 15. Then, the outer shell process hole segment is cut and the outer shell process hole segment is tilted into the outer fuel tank. During the tilting process, a person pulls the chain of the chain hoist so that the outer shell process hole segment 8 is gradually tilted into the outer fuel tank. A chain hoist is suspended at the sixth outer shell process hole lifting ring 22 on each side of the rib plate.

[0070] like Figure 11 As shown, after the outer shell process hole segment is completely tilted, the hand chain hoist is hung at the fourth outer shell process hole lifting ring 18, and the hook of the hand chain hoist is connected to the second outer shell process hole lifting ring 16. The chain of the hand chain hoist is pulled to move the outer shell process hole segment 8 to the outside of the outer plate.

[0071] like Figure 12 As shown, the crane hook is connected to the third outer shell process hole lifting ring 17 to lift the outer shell process hole segment 8 to the main assembly platform.

[0072] Step 4: Cut the process hole according to the opening position to form the inner shell process hole segment 7. The inner shell process hole segment 7 includes the inner fuel tank wall 2, the first outer fuel tank wall 3, and the rib plate 19 disposed between the inner fuel tank wall 2 and the first outer fuel tank wall 3. Use the lifting ring of the inner shell process hole segment connected by the lifting tool to lift the inner shell process hole segment into the outer fuel tank.

[0073] Specifically, such as Figure 13 As shown, the hand chain hoist is suspended at the fifth inner shell process hole lifting ring 13, and the hook of the hand chain hoist is connected to the first inner shell process hole lifting ring 9. Then, the inner shell process hole segment 7 is cut and the inner shell process hole segment is tilted into the inner fuel tank. During the tilting process, the chain of the hand chain hoist is pulled so that the inner shell process hole segment 7 is gradually tilted into the inner fuel tank.

[0074] like Figure 14 As shown, after the inner shell process hole segment 7 is completely tilted, the hand chain hoist is suspended at the fourth inner shell process hole lifting ring 12, and the hook of the hand chain hoist is connected to the second inner shell process hole lifting ring 10. The chain of the hand chain hoist is pulled to move the inner shell process hole segment 7 into the outer fuel tank.

[0075] like Figure 15 As shown, a hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring 11 of the third inner shell process hole to completely lift the inner shell process hole segment 7 into the outer fuel tank.

[0076] Step 5: After the construction of the containment system for the inner and / or outer fuel tanks is completed, hoist the inner and outer shell process hole segments to their original positions and reinstall them sequentially. First, hoist and reinstall the inner shell process hole segments, then hoist and reinstall the outer shell process hole segments.

[0077] When hoisting and repositioning the process hole segment of the inner shell section:

[0078] A hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring 11 of the third inner shell process hole to completely lift the inner shell process hole segment close to the first outer fuel tank wall 3.

[0079] The hand chain hoist is suspended at the fourth inner shell process hole lifting ring 12, and the hook of the hand chain hoist is connected to the second inner shell process hole lifting ring 10. The chain of the hand chain hoist is pulled to move the inner shell process hole segment 7 into the inner fuel tank.

[0080] After the inner shell process hole plate is moved to the inner fuel tank, the hand chain hoist is suspended at the fifth inner shell process hole lifting ring 13. The hook of the hand chain hoist is connected to the first inner shell process hole lifting ring 9. Pulling the chain of the hand chain hoist causes the inner shell process hole plate to rotate 90 degrees and reset.

[0081] When hoisting and repositioning the process hole segment of the outer shell:

[0082] First, the outer shell process hole segment 8 is lifted to the outer plate 6 using the crane hook, third outer shell process hole lifting ring 17;

[0083] Then, the hand chain hoist is hung at the fourth outer shell process hole lifting ring 18, and the hook of the hand chain hoist is connected to the second outer shell process hole lifting ring 16. Pulling the chain of the hand chain hoist causes the outer shell process hole segment to move into the outer fuel tank.

[0084] Hang the chain hoist at the sixth process hole ring 22 of the outer casing, and connect the hook of the chain hoist to the first process hole ring 15 of the outer casing. Pull the chain of the chain hoist to make the outer casing segment 8 rotate 90 degrees and reset.

[0085] 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 method for hoisting and constructing a process port in a dual-fuel tank, characterized in that, The method includes: Step 1: Construct a dual-fuel tank, which includes an inner fuel tank and an outer fuel tank. The bulkhead between the inner and outer fuel tanks includes an inner fuel tank bulkhead and a first outer fuel tank bulkhead. The bulkhead between the outer fuel tank and the outer side of the hull includes a second outer fuel tank bulkhead and an outer plating. Ribs connect the inner fuel tank bulkhead and the first outer fuel tank bulkhead, and ribs connect the second outer fuel tank bulkhead and the outer plating. During construction, lifting rings are pre-installed on the inner fuel tank wall, the first outer fuel tank wall, the second outer fuel tank wall, the outer plate, and the ribs according to the location of the process holes. Within the process hole opening range on the inner fuel tank wall near the first outer fuel tank wall, first inner shell process hole lifting rings are installed on both sides of the upper end of the process hole opening range, and second inner shell process hole lifting rings are installed on both sides of the lower end of the process hole opening range. Within the process hole opening range on the first outer fuel tank wall near the inner fuel tank wall, third inner shell process hole lifting rings are installed on both sides of the upper end of the process hole opening range. Outside the process hole opening range on the side of the outer fuel tank wall near the second outer fuel tank wall, fourth inner shell process hole lifting rings are installed on both sides near the lower end of the process hole opening range; an inner shell process hole reinforcement is connected between the inner fuel tank wall and the first outer fuel tank wall, and the inner shell process hole reinforcement is located near the lower end of the process hole opening range; a fifth inner shell process hole lifting ring is installed on the rib plate between the inner fuel tank wall and the first outer fuel tank wall, and the fifth inner shell process hole lifting ring is installed on the rib plate closest to the edge of the process hole opening range on both sides outside the process hole opening range and is located above the process hole opening range; Step 2: After the dual fuel tank integrity construction is completed, conduct a tightness test on the inner fuel tank and a tightness test on the outer fuel tank. Step 3: Cut the process holes according to their opening positions to form the outer shell process hole segment. The outer shell process hole segment includes the second outer fuel tank wall, the outer plate, and the rib plate set between the second outer fuel tank wall and the outer plate. Use the lifting rings of the outer shell process hole segment connected by the lifting equipment to lift the outer shell process hole segment to the assembly platform. Step 4: Cut the process hole according to its location to form an inner shell process hole segment. The inner shell process hole segment includes an inner fuel tank wall, a first outer fuel tank wall, and a rib plate disposed between the inner fuel tank wall and the first outer fuel tank wall. Use a lifting device to connect the lifting ring of the inner shell process hole segment to the outer fuel tank to lift the inner shell process hole segment into the outer fuel tank. Step 5: After the construction of the inner and outer fuel tank containment systems is completed, hoist the inner shell process hole segments and the outer shell process hole segments to their original positions and reinstall them.

2. The method for hoisting and constructing a dual-fuel tank process port according to claim 1, characterized in that, Within the range of the process opening on the side of the second outer fuel tank wall near the outer plate, a first outer shell process opening lifting ring is installed on both sides near the middle of the process opening height, and a second outer shell process opening lifting ring is installed on both sides near the lower end of the process opening; a fifth outer shell process opening lifting ring is installed above the range of the process opening on the side of the second outer fuel tank wall near the first outer fuel tank wall.

3. The method for hoisting and constructing a dual-fuel tank process port according to claim 2, characterized in that, A fourth outer shell process hole lifting ring is installed on both sides outside the process hole opening range on the side of the outer plate near the second outer fuel tank wall, with the fourth outer shell process hole lifting ring positioned near the lower end of the process hole opening range; a third outer shell process hole lifting ring is installed on both sides near the upper end of the process hole opening range on the other side of the outer plate; an outer shell process hole reinforcement is connected between the outer plate and the second outer fuel tank wall, with the outer shell process hole reinforcement located within the process hole opening range; the fourth outer shell process hole lifting ring is higher than the outer shell process hole reinforcement.

4. The method for hoisting and constructing a dual-fuel tank process port according to claim 3, characterized in that, On the rib between the second outer fuel tank wall and the outer plate, a sixth outer shell process hole lifting ring is installed. The sixth outer shell process hole lifting ring is installed on the ribs on both sides outside the process hole opening range that are closest to the edge of the process hole opening range and located above the process hole opening range.

5. The method for hoisting and constructing a dual-fuel tank process port according to claim 4, characterized in that, Lifting equipment includes hand chain hoists and cranes; When lifting the process hole segment of the outer shell to the main assembly platform using the lifting rings connected to the lifting tool: Hang the chain hoist at the sixth outer shell process hole lifting ring, connect the hook of the chain hoist to the first outer shell process hole lifting ring, then cut the outer shell process hole segment, and pour the outer shell process hole segment into the outer fuel tank. During the pouring process, a person pulls the chain of the chain hoist so that the outer shell process hole segment is gradually poured into the outer fuel tank. After the outer shell process hole segment is completely tilted, hang the hand chain hoist at the fourth outer shell process hole lifting ring. Connect the hook of the hand chain hoist to the second outer shell process hole lifting ring, and pull the chain of the hand chain hoist to move the outer shell process hole segment to the outside of the outer plate. Connect the crane hook to the third outer shell process hole lifting ring and lift the outer shell process hole segment to the main assembly platform; During the hoisting, repositioning, and installation process in step 5: First, the outer shell process hole segment is lifted to the outer plate using the crane hook and the third outer shell process hole lifting ring; Then, the chain hoist is hung on the fourth outer shell process hole lifting ring, and the hook of the chain hoist is connected to the second outer shell process hole lifting ring. Pulling the chain hoist's chain causes the outer shell process hole segment to move into the outer fuel tank. Hang the chain hoist at the sixth process hole ring of the outer casing, and connect the hook of the chain hoist to the first process hole ring of the outer casing. Pull the chain hoist to make the outer casing segment rotate 90 degrees and reset.

6. The method for hoisting and constructing a process port in a dual-fuel tank according to claim 1, characterized in that, Lifting equipment includes hand chain hoists; When lifting the inner shell process hole segment into the outer fuel tank using the lifting rings connected to the lifting equipment: The hand chain hoist is suspended at the fifth inner shell process hole lifting ring, and the hook of the hand chain hoist is connected to the first inner shell process hole lifting ring. Then, the inner shell process hole segment is cut and the inner shell process hole segment is tilted into the inner fuel tank. During the tilting process, the chain of the hand chain hoist is pulled so that the inner shell process hole segment is gradually tilted into the inner fuel tank. After the inner shell process hole segment is completely tilted, suspend the hand chain hoist at the fourth inner shell process hole lifting ring, connect the hook of the hand chain hoist to the second inner shell process hole lifting ring, and pull the chain of the hand chain hoist to move the inner shell process hole segment into the outer fuel tank. A hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring of the third inner shell process hole to completely lift the inner shell process hole segment into the outer fuel tank. During the hoisting, repositioning, and installation in step 5: A hand-operated hoist is suspended at the top inside the outer fuel tank. The hook of the hand-operated hoist is connected to the lifting ring of the third inner shell process hole to completely lift the inner shell process hole segment close to the first outer fuel tank wall. Suspend the chain hoist at the fourth inner shell process hole lifting ring, connect the hook of the chain hoist to the second inner shell process hole lifting ring, and pull the chain of the chain hoist to move the inner shell process hole segment into the fuel tank. After the inner shell process hole plate is moved to the inner fuel tank, the hand chain hoist is suspended at the fifth inner shell process hole lifting ring. The hook of the hand chain hoist is connected to the first inner shell process hole lifting ring. Pulling the chain of the hand chain hoist causes the inner shell process hole plate to rotate 90 degrees and reset.

Images