A construction method for a ship side tank section

Abstract

A construction method for a ship side tank section. When constructing a ship side tank section, the ship side tank section is constructed in segments. First, on different workstations, a deck plate sub-section, a hull plate sub-section, and a slope plate sub-section are respectively fabricated. Then, the slope plate sub-section is hoisted and transported, and successively assembled and welded with the deck plate sub-section and the hull plate sub-section. Finally, the side tank section is manufactured. The whole manufacturing process reduces overhead welding, improves the welding quality. At the same time, during the construction process, the use of tooling lifting appliances reduces the loss of lifting materials, and the tooling lifting appliances can be reused.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a construction method for a ship side tank section. Background Art

[0002] In the shipbuilding industry, due to the huge hull size, in the actual shipbuilding process, the hull is generally divided into sections for manufacturing. At the same time, in order to improve the construction efficiency within the section, it is usually further divided into several smaller sub-sections for construction according to the specific structural form.

[0003] The above-mentioned ship side tank sections refer to the upper side tank section and the lower side tank section. The upper side tank section includes a ramp plate sub-section, a deck sheet sub-section, and an outer plate sheet sub-section. The lower side tank section does not include the deck sheet sub-section and only includes the ramp plate sub-section and the outer plate sheet sub-section. The construction methods of the upper side tank section and the lower side tank section are the same except for not constructing the deck sheet sub-section.

[0004] When constructing a ship side tank section, the ramp plate sub-section needs to be transported. The process of detaching the ramp plate sub-section from the support jig during its production is called "lifting off the jig". When it is transported to the next working station, a turning operation is required. Two sets of lifting lugs need to be arranged during lifting off the jig and turning operation. The lifting lug for lifting off the jig needs to be cut off after being used only once, and various costs such as welding, flaw detection, and grinding generated in the middle all lead to an increase in material and labor costs. Moreover, there are also certain problems with the existing turning lifting lugs. When the main hook lifting lug is combined with the outer plate sheet sub-section, it will get stuck, affecting the assembly, and the head of the lifting lug needs to be cut off. The auxiliary hook lifting lug is a special lifting lug designed to be connected to the longitudinal girder, with a large amount of welding and troublesome removal after use. After retrieval, no existing construction method for a ship side tank section similar to the present invention was found. In the invention patent with the application number "CN201210354081.6" and the name "Application of a detachable lifting lug structure for a ship T-section segment", a tooling for clamping the T-beam panel is recorded. Although this tooling can be reused, there are also certain drawbacks. One is that it can only be used for small-tonnage applications. Excessive load-bearing will cause serious plastic deformation of the T-beam panel. The second is that the installation and disassembly processes are difficult. The tooling needs to be inserted from one end of the structural T-beam and move a certain distance through sliding friction, which is difficult to operate. Once there is a strengthening structure on the T-beam, the tooling cannot move forward and is easily restricted from use. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for a ship side tank section. When constructing the ship side tank section, the ship side tank section is constructed in sections, shortening the construction period, reducing overhead welding throughout the process, improving the welding quality. At the same time, during the construction process, the use of tooling lifting devices reduces the loss of lifting materials and can be reused.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A construction method for a ship side tank section is as follows: In the first step, on different workstations, a deck plate sub-section, an outer plate sub-section, and a ramp plate sub-section are respectively fabricated; on the workstation of the ramp plate sub-section, the left elbow plate, the right elbow plate, the ramp plate, and the ramp plate longitudinal girder are welded together to fabricate the ramp plate sub-section; L-shaped lifting lugs, opposite L-shaped lifting lugs to the L-shaped lifting lugs, and D-shaped lifting lugs are welded on the ramp plate sub-section; In the second step, a tooling lifting device is installed on the fabricated ramp plate sub-section, the upper end of the rope three is connected to the crane, and the lower end is connected to the tooling lifting device; the crane hoists the ramp plate sub-section off the mold and lands it on the gantry, and it is transported to the deck plate sub-section workstation by a flatbed truck; In the third step, on the deck plate sub-section workstation, two cranes respectively hoist the ramp plate sub-section through the rope one and the L-shaped lifting lug, and the rope two and the D-shaped lifting lug; when the ramp plate sub-section is hoisted from the horizontal position to the vertical position, the rope one is disengaged from the L-shaped lifting lug, the ramp plate sub-section is rotated 180 degrees along the Y-axis of the coordinate axis, then the rope one is passed through the opposite L-shaped lifting lug to the L-shaped lifting lug, the rope one is tightened upward while the rope two is loosened downward, and the ramp plate sub-section is landed on the deck plate sub-section and welded to form the deck section; In the fourth step, the deck section is moved to the outer plate sub-section workstation, the deck section is landed on the outer plate sub-section for welding manufacturing, and finally the side tank section is manufactured.

[0008] For the above-mentioned construction method of the ship side tank section, the tooling lifting device includes a connecting plate, an upper ear plate, a load-bearing plate, a lower ear plate, and a pin four. The upper ear plate is welded above the connecting plate; the lower ear plate is welded below the connecting plate; the left side of the load-bearing plate is movably connected to the upper ear plate through a pin one, and the left side of the load-bearing plate is movably connected to the upper ear plate through a pin three; the pin two can movably pass through the middle hole of the load-bearing plate, and during work, the pin two is connected to the rope three for hoisting the workpiece; a pin two reinforcing hole plate is provided at the middle hole of the load-bearing plate, and a reinforcing plate is provided below the load-bearing plate; the pin four can movably pass through the hole on the lower ear plate; a pin four reinforcing hole plate is provided at the hole on the lower ear plate.

[0009] For the above-mentioned construction method of the ship side tank section, the pin four is in a cuboid shape, and the left and right side surfaces of the pin four are in an arc shape.

[0010] For the above-mentioned construction method of the ship side tank section, when the L-shaped lifting lug is welded to the ramp plate sub-section, the welding is carried out according to the positions of the weld one and the weld two; the opposite L-shaped lifting lug to the L-shaped lifting lug is welded at the corresponding position on the ramp plate opposite to the welding position of the L-shaped lifting lug.

[0011] Beneficial effects

[0012] The present invention has the following advantages:

[0013] The method for constructing the ship's side tank sections of the present invention has the following advantages: First, the ship's side tank sections are constructed in sections, which shortens the construction period, reduces overhead welding throughout the process, and improves the welding quality. Second, when the ramp plate sections are transported under the tire, the original lower tire lifting ears need to be cut off after only one use, and the various costs such as welding, flaw detection, and grinding generated in the middle all lead to increased material and labor costs. When the ramp plate sections are transported under the tire, the present invention uses a tooling sling, which does not need to be welded to the hull. The tooling sling is connected to the water flow hole on the ramp plate longitudinal bone through a special pin column four. Bolt holes are provided on both sides of the pin column four, and bolts are inserted to fix and constrain the pin column four. The tooling sling adopts a three-section split design, with both sides connected to the hull structure and the middle as a load-bearing member, which can effectively reduce the bending moment generated by the tooling on the hull structure and avoid stress concentration. The tooling can be reused and is installed in three sections. It is lightweight and easy for workers to install and remove. There is no need to change the original hull structure, which perfectly solves the problem of high material and labor costs for segmented lifting. Third, the L-shaped lifting lug abandons the characteristics of full welding between the traditional lifting lug and the hull, and only welds high stress, which greatly reduces the use of welding materials. In addition, the L-shaped lifting lug itself has been calculated by finite element and is light in weight, which facilitates workers to install, cut, grind and paint repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram when the slope board is in a horizontal state in sections;

[0015] Figure 2 This is a schematic diagram of the horizontal transfer and hoisting of the sloped board in sections;

[0016] Figure 3 This is a schematic diagram of the ramp board after it is hoisted in sections in a vertical state and rotated 180 degrees;

[0017] Figure 4 It is a schematic diagram of the ramp plate segment being rotated 180 degrees and welded to the deck plate segment;

[0018] Figure 5 It is a schematic diagram of the welding of the deck section and the outer plate body sub-section;

[0019] Figure 6 It is a structural diagram of the tooling lifting device;

[0020] Figure 7 This is an enlarged view of part A;

[0021] The labels in the figure are respectively represented as follows: 1. Deck sheet sub-subsection; 2. Outer plate sheet sub-subsection; 3. Ramp plate sub-subsection; 4. L-shaped lug; 5. Rope 1; 6. D-shaped lug; 7. Rope 2; 8. Left gusset plate; 9. Ramp plate; 10. Ramp plate longitudinal girder; 11. Rope 3; 12. Tooling sling; 13. Right gusset plate; 14. Hull T-beam; 15. Connecting plate; 16. Upper ear plate; 17. Pin 1; 18. Pin 2; 19. Pin 3; 20. Load-bearing plate; 21. Reinforcing plate; 22. Pin 2 reinforcing hole plate; 23. Lower ear plate; 24. Pin 4; 25. Pin 4 reinforcing hole plate; 26. Weld 1; 27. Weld 2; 28. Opposite lug of L-shaped lug. Detailed implementation mode

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] A construction method for a ship side tank subsection of the present invention, wherein the side tank subsection refers to the upper side tank subsection and the lower side tank subsection. The lower side tank subsection does not include the deck sheet sub-subsection. During the construction process of the lower side tank subsection, there is no need to carry out the welding manufacture of the deck sheet sub-subsection. The remaining construction methods of the upper side tank subsection and the lower side tank subsection are the same. The present invention takes the construction method of the upper side tank subsection as an example for detailed elaboration.

[0024] A construction method for a ship side tank subsection of the present invention is as follows: First, the ramp plate sub-subsection, the deck sheet sub-subsection, and the outer plate sheet sub-subsection are respectively manufactured at different workstations; after the ramp plate sub-subsection is built, assembled, and welded at the ramp plate sub-subsection workstation, two cranes at the sub-subsection workstation are used to lift it off the lower mold and place it on the gantry, and then it is transported to the deck sheet sub-subsection workstation by a flatbed truck. Then, the ramp plate sub-subsection is turned over by a crane and placed on the deck sheet sub-subsection to form a deck subsection; after the deck subsection is assembled and welded, it is moved to the outer plate sheet sub-subsection workstation, and the deck subsection is lifted and placed on the outer plate sheet sub-subsection by a gantry crane for welding, and finally the upper side tank subsection is assembled.

[0025] A construction method for a ship side tank subsection of the present invention, as Figure 2 shown, after the ramp plate sub-subsection 3 is manufactured at the horizontal sub-subsection workstation, four tooling slings 12 are installed on the ramp plate longitudinal girder 10, and two cranes are used to lift the ramp plate sub-subsection; as Figure 6 shown, the pin 4 of the tooling sling 12 passes through the flow hole on the ramp plate longitudinal girder 10; the lower end of the rope 3 is movably connected to the pin 2 through a U-shaped connecting piece. Figure 6 The hull T-beam 14 shown in

[0026] A construction method for a ship side tank section. After the ramp plate section 3 is transported to a new work station, as Figure 1 shown, use rope 5 to connect the L-shaped lifting lug 4, and use rope 7 to connect the D-shaped lifting lug 6. Under the action of two cranes, lift the ramp plate section into a vertical state. At this time, rotate the ramp plate section 180 degrees, as Figure 3 shown. Then lift the ramp plate section into the Figure 4 state and perform the welding of the ramp plate section and the deck sheet section 1. Finally, lift the welded deck section into the Figure 5 state to complete the welding with the outer plate sheet section 2.

[0027] A construction method for a ship side tank section, as Figure 7 shown. When the L-shaped lifting lug 4 is welded to the ramp plate section 3, the welding points are selected at the positions of weld 26 and weld 27 in the figure. The L-shaped lifting lug abandons the characteristic of full welding between the traditional lifting lug and the ramp plate section, and only welds the high-stress areas, greatly reducing the consumption of welding materials. And the L-shaped lifting lug itself is calculated by finite element, with light self-weight, which facilitates the installation, cutting, grinding and paint repair work of workers.

Claims

1. A construction method for a ship side tank section, characterized in that: The construction method of the ship side tank section is as follows: First step, on different workstations, respectively manufacture the deck plate sub-section (1), the outer plate sub-section (2), and the ramp plate sub-section (3); on the workstation of the ramp plate sub-section, weld the left elbow plate (8), the right elbow plate (13), the ramp plate (9), and the ramp plate longitudinal girder (10) together to manufacture the ramp plate sub-section (3); weld the L-shaped lifting lug (4), the L-shaped lifting lug opposite lifting lug (28), and the D-shaped lifting lug (6) on the ramp plate sub-section. Second step, install the tooling lifting device (12) on the manufactured ramp plate sub-section (3), connect the upper end of the rope three (11) to the crane and the lower end to the tooling lifting device; the crane hoists the ramp plate sub-section off the mold and lands it on the gantry, and transports it to the deck plate sub-section workstation by a flatbed truck. Third step, at the deck plate sub-section workstation, two cranes respectively hoist the ramp plate sub-section through the rope one (5) and the L-shaped lifting lug (4), and the rope two (7) and the D-shaped lifting lug (6); when hoisting the ramp plate sub-section from the horizontal position to the vertical position, disconnect the rope one from the L-shaped lifting lug, rotate the ramp plate sub-section 180 degrees along the Y-axis of the coordinate axis, then pass the rope one through the L-shaped lifting lug opposite lifting lug (28), tighten the rope one upward and loosen the rope two downward at the same time, and let the ramp plate sub-section fall onto the deck plate sub-section (1) and weld to form the deck section. Fourth step, then move the deck section to the outer plate sub-section workstation, let the deck section fall onto the outer plate sub-section (2) and weld to manufacture, and finally manufacture to form the side tank section.

2. The construction method of a ship side tank section according to claim 1, characterized in that: The tooling lifting device (12) includes a connecting plate (15), an upper ear plate (16), a load-bearing plate (20), a lower ear plate (23), and a pin four (24). The upper ear plate is welded above the connecting plate; the lower ear plate is welded below the connecting plate; the left side of the load-bearing plate is movably connected to the upper ear plate through a pin one (17), and the left side of the load-bearing plate is movably connected to the upper ear plate through a pin three (19); the pin two (18) is movably passed through the middle hole of the load-bearing plate, and during work, the pin two is connected to the rope three (11) for hoisting the workpiece; a pin two reinforcing hole plate (22) is provided at the middle hole of the load-bearing plate, and a reinforcing plate (21) is provided below the load-bearing plate; the pin four (24) is movably passed through the hole on the lower ear plate; a pin four reinforcing hole plate (25) is provided at the hole on the lower ear plate.

3. A construction method for a ship side tank section according to claim 2, characterized in that: The pin four (24) is in a cuboid shape, and the left and right side surfaces of the pin four are arc-shaped.

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