Method for integral hoisting of folding hatch covers on polar multipurpose vessels

Abstract

This invention discloses a method for the overall hoisting of folding hatch covers on polar multipurpose vessels, comprising the following steps: a) hoisting two hatch covers separately onto transport brackets; b) transporting the two hatch covers to the assembly site using a flatbed truck; c) adjusting the positioning accuracy of the hatch covers; d) installing the connecting pins between the hatch covers; e) installing anti-back-folding T-shaped fixtures; f) selecting a 400T gantry crane for hoisting; h) determining the lifting point positions of the hatch covers; i) determining the type of lifting points; j) installing hoisting shackles and wire ropes; k) lifting the entire hatch cover onto the slipway and merging it. This invention's method for the overall hoisting of folding hatch covers on polar multipurpose vessels solves the problem of multiple hoistings of a single folding hatch cover and the safety issue of reverse folding during hoisting of folding hatch covers, improving hoisting efficiency, shortening the construction period, and significantly enhancing competitiveness.

Description

Technical Field

[0001] This invention relates to a method for hoisting a folding hatch cover of a polar multipurpose vessel as a whole. Background Technology

[0002] Currently, for pulp ships, container ships, bulk carriers, and other vessels with folding hatch covers, manufacturers transport each hatch cover individually to the shipyard, and then the shipyard transports it to the mounting area for individual hoisting, mounting, and assembly. Each hatch area requires at least two hoisting operations by a gantry crane to complete the hoisting and installation of the hatch cover, resulting in low construction efficiency, long gantry crane usage time, and impact on the shipyard's schedule. Summary of the Invention

[0003] The purpose of this invention is to provide a method for hoisting a foldable hatch cover of a polar multipurpose vessel by more than doubling the hoisting and installation speed and reducing the difficulty of construction.

[0004] The technical solution adopted by the present invention to achieve the above objectives is: a method for integrally hoisting a folding hatch cover of a polar multipurpose vessel, comprising the following steps:

[0005] a. Moor the barge carrying the hatch cover to the edge of the dock and use a sea crane to lift the two half hatch covers onto the brackets that were placed in advance on the dock.

[0006] b. Use a flatbed truck to transport the two half hatch covers to the final assembly area;

[0007] c. Adjust the hatch cover positioning accuracy and assemble the two half-hat covers together by using the relative moving bracket;

[0008] d. Install the rotating connecting pin of the hatch cover;

[0009] e. Install anti-back-folding T-shaped fixtures between the two half-hat covers, and place anti-back-folding T-shaped plate fixtures at the alignment of each longitudinal beam, for a total of 12 locations;

[0010] f. Two lifting lugs are installed on the outermost sides of each half hatch cover as lifting points for the whole installation.

[0011] g. Install shackles at the four lifting points on the left side of the overall hatch cover. Each shackle is connected to a steel wire rope, using the No. 1 hook and the No. 2 hook of a 400T crane.

[0012] h. Install shackles at the four lifting points on the right side of the overall hatch cover. Each shackle is connected to a steel wire rope, using a 400T crane No. 3 hook and a 100-ton lifting bar for connection.

[0013] i. Simultaneously lift the No. 1 hook, No. 2 hook, and No. 3 hook of the 400T crane. After the hatch is raised by 0.5 meters, hover for 5 minutes and check the compressive stress state of the 12 anti-back-folding T-shaped tooling.

[0014] j. When the anti-back-folding T-shaped tooling is in good extrusion stress state and there is no extrusion, skewing or deformation, lift the two half hatch covers as a whole and hoist the hatch covers onto the ship structure for assembly.

[0015] k. After hoisting and installing the hatch cover as a whole onto the hull, perform sealing welding. Loosen the No. 1 hook, No. 2 hook, and No. 3 hook of the 400T crane, and remove the anti-back-folding T-shaped fixture, which will be used for subsequent hoisting of other folding hatch covers. This completes the overall hoisting of the folding hatch cover.

[0016] In step b, the flatbed truck has a rated load of 200 tons, a maximum speed of 10 km / h when unloaded, a maximum speed of 5 km / h when fully loaded, and a working platform size of 15500 mm × 5100 mm.

[0017] In step f, there are 8 lugs.

[0018] In steps g and h, the safe load of the shackle shall not be less than 55 tons.

[0019] In step g, the length of the wire rope is ≥20 meters.

[0020] In step h, the length of the wire rope is ≥12 meters.

[0021] This invention provides a method for hoisting a folding hatch cover as a whole on a polar multipurpose vessel. It solves the problem of hoisting a single folding hatch cover multiple times and the safety issue of reverse folding that easily occurs during the hoisting of folding hatch covers. This method improves hoisting and loading efficiency, shortens the construction period, and greatly enhances competitiveness. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first half of the hatch cover in the overall hoisting method of the folding hatch cover of the polar multipurpose vessel of the present invention.

[0023] Figure 2 This is a schematic diagram of the second half of the hatch cover in the overall hoisting method of the folding hatch cover of the polar multipurpose vessel of the present invention.

[0024] Figure 3 This is a schematic diagram of the assembly of the folding hatch assembly for the overall hoisting method of the folding hatch of a polar multipurpose vessel according to the present invention.

[0025] Figure 4 This invention relates to a method for hoisting a foldable hatch cover for polar multipurpose vessels, which involves connecting two half-hatch covers into a single, integral hatch cover.

[0026] Figure 5 This is a schematic diagram of the overall hoisting and docking installation of the folding hatch cover of a polar multipurpose vessel according to the present invention.

[0027] Figure 6 This is a schematic diagram of the anti-back-folding T-shaped tooling for an integral hoisting method of a folding hatch cover for a polar multipurpose vessel according to the present invention.

[0028] In the picture: 1. First half of the hatch cover; 2. Second half of the hatch cover; 3. Wooden block; 4. Bracket; 5. 400-ton crane hook number one; 6. 400-ton crane hook number two; 7. 400-ton crane hook number three; 8. Wire rope; 9. Anti-back-folding T-shaped fixture; 10. Shackle; 11. Connecting pin; 12. Lifting lug; 13. 100-ton lifting bar; 14. Flatbed truck. Detailed Implementation

[0029] like Figures 1 to 6As shown, the method for hoisting the folding hatch cover of a polar multipurpose vessel includes the following steps: a) Moor the barge transporting the hatch cover to the edge of the dock, and use a sea crane to hoist the two half-hat covers, the first half-hat cover 1 and the second half-hat cover 2, onto the pre-placed brackets 4 on the dock. Place wooden blocks 3 on the brackets 4, and place the first half-hat cover 1 and the second half-hat cover 2 on the wooden blocks 3. The weight of the first half-hat cover 1 is 30 tons and the weight of the second half-hat cover 2 is 34 tons. The external dimensions of the first half-hat cover 1 are 5.8 meters * 22 meters * 1.0 meter; the external dimensions of the second half-hat cover 2 are... The dimensions are: 6.5m * 22m * 1.0m. The folding hatch consists of a first half hatch 1, a second half hatch 2, an anti-back-folding T-shaped fixture 9, and a connecting pin 11. b. A flatbed truck 14 is used to transport the first half hatch 1 and the second half hatch 2 to the assembly loading area. The flatbed truck has a rated load of approximately 200 tons, a tare weight of approximately 52 tons, a maximum speed of 10 km / h when unloaded, and a maximum speed of 5 km / h when fully loaded. The flatbed truck's working platform dimensions are 15500 mm × 5100 mm, and the minimum platform descent height (height from the ground) is approximately 1600 mm. The total lifting height of the platform... c. Adjust the hatch cover positioning accuracy and assemble the first half-hat cover 1 and the second half-hat cover 2 together using the relative moving bracket 4; d. Install the hatch cover rotating connecting pin 11; e. Install the anti-back-folding T-shaped fixture 9 between the first half-hat cover 1 and the second half-hat cover 2. Place the anti-back-folding T-shaped fixture 9 at each longitudinal beam alignment point. (h*b*t,L): 55*60*15 mm, length 300 mm, totaling 12 locations; f. Set two lifting lugs 12 on the outermost sides of each half-hat cover as overall lifting points. The lifting lugs 12 are 8 mm in diameter. g. Install shackles 10 at the four lifting points on the left side of the overall hatch cover, each shackle connected to a steel wire rope 8, the steel wire rope being ≥20 meters long, connected using 400T crane hook 1 5 and 400T crane hook 2 6; h. Install shackles 10 at the four lifting points on the right side of the overall hatch cover, each shackle connected to a steel wire rope 8, the steel wire rope being ≥12 meters long, connected using 400T crane hook 3 7 and 100-ton lifting bar 13, the safe load of shackle 10 is not less than 55 tons; i. Simultaneously lift 400T crane hook 1 5, 400T crane hook 2 6 and 400T crane hook 3 7, the overall hatch cover is raised 0.After hovering for 5 minutes at a height of 5 meters, inspect the compressive stress condition of the 12 anti-back-folding T-shaped fixtures 9. A 400T crane with a maximum horizontal lifting capacity of 380 tons; hooks 5 (number 1) and 6 (number 2) of the 400T crane each have a maximum lifting capacity of 152 tons; hook 7 (number 3) of the 400T crane has a maximum lifting capacity of 190 tons; the hook lifting height is 55 meters. j. Once the compressive stress condition of the anti-back-folding T-shaped fixtures 9 is intact, with no extrusion, tilting, or deformation, lift the two half-piece hatch covers as a whole and hoist them onto the ship's structure for assembly. k. [The text abruptly ends here, likely due to an incomplete sentence or missing information.] The hatch cover is hoisted and placed aft of the hull, then sealed with welding. Hooks 5 (number 1), 6 (number 2), and 7 (number 3) of the 400T crane are released, and the anti-back-folding T-shaped fixture 9 is removed for future use in hoisting other folding hatch covers. This completes the overall hoisting of the folding hatch cover. This invention's method for hoisting folding hatch covers for polar multipurpose vessels solves the problem of multiple hoistings of a single folding hatch cover and the safety issue of reverse folding during hoisting. It improves hoisting efficiency, shortens the construction period, and significantly enhances competitiveness.

Claims

1. A method of integral hoisting of a folding hatch cover for a polar multipurpose vessel, characterized in that, The method comprises the following steps: a. docking the barge carrying the hatch cover at the edge of the wharf, and using a marine crane to hoist the two half pieces of the hatch cover to the cradles previously placed on the wharf; b. using a flat car to transport the two half pieces of the hatch cover to the total assembly site; c. adjusting the positioning accuracy of the hatch cover, and butting the two half pieces of the hatch cover together by relatively moving the cradles; d. installing the rotating connecting pin of the hatch cover; e. installing anti-backfolding T-shaped tooling between the two half pieces of the hatch cover, and placing the anti-backfolding T-shaped tooling at 12 positions corresponding to the longitudinal girders; f. arranging two lifting lugs on the outermost sides of each half piece of the hatch cover as the overall hoisting point; g. installing shackles at the four lifting points on the left side of the overall hatch cover, connecting a steel wire rope to each shackle, and connecting a 400T crane No. 1 hook and a 400T crane No. 2 hook; h. installing shackles at the four lifting points on the right side of the overall hatch cover, connecting a steel wire rope to each shackle, and connecting a 400T crane No. 3 hook and a 100T lifting bar; i. simultaneously lifting the 400T crane No. 1 hook, the 400T crane No. 2 hook and the 400T crane No. 3 hook, and hovering the overall hatch cover for 5 minutes after lifting it by 0.5 meters, and checking the extrusion stress state of the 12 anti-backfolding T-shaped toolings; j. when the extrusion stress state of the anti-backfolding T-shaped tooling is intact without extrusion, skewing or deformation, lifting the two half pieces of the hatch cover as a whole, and hoisting the hatch cover to the ship structure for closing and installing; k. after hoisting and installing the overall hatch cover on the ship body, performing sealing welding, loosening the 400T crane No. 1 hook, the 400T crane No. 2 hook and the 400T crane No. 3 hook, removing the anti-backfolding T-shaped tooling, and leaving it for subsequent hoisting of other folded hatch covers, and completing the overall hoisting of the folded hatch cover.

2. A method of integral hoisting of a folding hatch cover for a polar multipurpose vessel according to claim 1, characterized in that: In step b, the flat car has a rated load of 200 tons, a maximum running speed of 10 km / h when empty, and a maximum running speed of 5 km / h when fully loaded, and the working platform of the flat car has a size of 15500 mm x 5100 mm.

3. A method of integral hoisting of a folding hatch cover for a polar multipurpose vessel according to claim 1, characterized in that: In step f, the lifting lug is 8.

4. A method of integral hoisting of a folding hatch cover for a polar multipurpose vessel according to claim 1, characterized in that: In steps g and h, the safety load of the shackle is not less than 55 tons.

5. A method of integral hoisting of a folding hatchcover of a polar multipurpose vessel according to claim 1, characterized in that: In step g, the length of the steel wire rope is greater than or equal to 20 meters.

6. A method of integral hoisting of a folding hatchcover of a polar multipurpose vessel according to claim 1, characterized in that: In step h, the length of the steel wire rope is greater than or equal to 12 meters.

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