Construction method of negative pressure bearing platform for construction of floating type offshore wind power floating body foundation

Abstract

The invention discloses a construction method of a negative pressure bearing platform for floating type offshore wind power floating body foundation construction, which comprises the following steps of: butting a floating body foundation with a suction bearing platform of the negative pressure bearing platform for floating type offshore wind power floating body foundation construction, so that negative pressure is formed in a barrel wall of a suction barrel structure, and the lower surface of the floating body foundation is tightly adsorbed above a rubber structure; and the overall vertical movement of the floating body foundation is limited, so that the construction process of stable position supporting is kept. Air is input into the barrel bottom through the pressure control valve to form slight high pressure, the floating body foundation only needs gravity adjustment and is not affected by magnetic attraction force, and the problem that the alignment process is inconvenient to adjust due to the fact that the floating body foundation is affected by the magnetic attraction force after being in butt joint with the bearing platform is solved.

Description

Technical Field

[0001] The invention relates to a construction method of a negative pressure bearing platform for construction of a floating offshore wind power buoy foundation, belonging to the technical field of offshore wind power construction. Background Art

[0002] In an offshore construction environment, when assembling wind turbine components onto a floating foundation, the stability of the floating foundation at sea must be ensured. The existing technology for stabilizing the floating foundation is shown in Chinese Patent Publication No. CN218877530U. Although the floating foundation can be adsorbed and supported in a stable position by the magnetic attraction of the magnetic block of the pedestal, the floating foundation is affected by the magnetic attraction after docking with the pedestal, and the alignment process is not convenient to adjust. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a construction method of a negative pressure bearing platform for the construction of a floating offshore wind power buoy foundation.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a method for constructing a negative pressure bearing platform for the construction of a floating offshore wind power buoy foundation, comprising: docking the buoy foundation with the suction bearing platform of the negative pressure bearing platform for the construction of the floating offshore wind power buoy foundation, so that negative pressure is formed inside the barrel wall of the suction cylinder structure, and the lower surface of the buoy foundation is tightly adsorbed on the rubber structure to limit the overall vertical movement of the buoy foundation, thereby maintaining a stable position support construction process.

[0006] The construction process includes towing the floating foundation to the top of the suction cylinder structure, adjusting the three columns of the floating foundation and placing them respectively above the contact layer of the rubber structure, and adjusting the ballast water of the floating foundation so that the floating foundation moves vertically downward until it is in stable and sealed contact with the contact surface, at which time the contact surface is under a certain pressure.

[0007] The construction process also includes lifting the other end of the mooring cable from the temporary dock to the floating foundation, then fixing the connecting buckle of the mooring cable to the lifting lug of the floating foundation, and using a tensioner to adjust the length of the mooring cable so that the floating foundation and the mooring pile are tensioned and fixed to limit the overall horizontal movement of the floating foundation.

[0008] The construction process also includes opening the pressure control valve, starting the suction cylinder water pump connected to the pressure control valve, pumping a certain amount of water outward from the barrel wall of the suction cylinder structure to form a negative pressure inside the barrel wall of the suction cylinder structure, and then closing the pressure control valve to ensure that the lower surface of the floating foundation is tightly adsorbed on the rubber structure, limiting the overall vertical movement of the floating foundation and maintaining a stable position support.

[0009] The construction process also includes opening the pressure control valve to release the negative pressure in the suction cylinder structure and remove the vertical movement restriction of the floating unit;

[0010] Remove all the shackles at the active ends of the mooring cables to release the horizontal movement restrictions of the floating unit. The active ends of the mooring cables are hoisted to the deck of the temporary dock for storage. Before removing the mooring cables, the towing vessel is in place, and the towing and lashing work is carried out simultaneously during the removal of the mooring cables.

[0011] The construction process also includes adjusting the ballast water of the floating foundation to make the floating foundation float and separate from the contact surface by a certain distance; and using a tugboat to tow the floating unit to the designed point of the wind farm for installation.

[0012] The beneficial effect of the present invention is that when the docking position between the floating foundation and the suction pedestal needs to be adjusted, air is input into the bottom of the barrel through the pressure control valve to form a slightly high pressure. The floating foundation is only adjusted by gravity and is not affected by the magnetic suction force. This solves the problem that the floating foundation is inconvenient to adjust the alignment process due to the influence of the magnetic suction force after docking with the pedestal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a distribution schematic diagram of the present invention;

[0014] Figure 2 Schematic diagram of the connection distribution of the barrel wall, barrel bottom and rubber wrapping layer of the present invention;

[0015] In the figure: 11- conductor frame; 12- water inlet and outlet interface; 13- pressure control valve; 14- barrel wall; 15- barrel bottom; 16- annular ribs; 17- reinforcement ring; 18- internal round pipe support; 191- rubber wrapping layer; 192- contact layer; 21- floating body foundation; 22- tower; 23- main engine; 3- temporary wharf; 4- sea surface; 51- mooring pile; 52- mooring cable; 6- mud surface. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0017] like Figure 1 to Figure 2 shown.

[0018] The present application discloses a negative pressure bearing platform for construction of a floating offshore wind power buoy foundation, comprising:

[0019] A suction support platform capable of generating negative pressure inside, wherein the suction support platforms are three and distributed in a triangular shape; a floating unit is installed on the suction support platform, and the floating unit includes a floating foundation 21, a tower 22 installed on the floating foundation 21, and a main engine 23 installed on the tower 22.

[0020] The suction support platform includes a conductor frame 11 inserted into the seabed bearing layer below the mud surface 6, a barrel bottom 15 is fixed on the top of the conductor frame 11, the barrel bottom 15 is tightly and fixedly connected to the barrel wall 14, the barrel wall 14 and the barrel bottom 15 form an upward concave suction cylinder, the barrel wall 14 is tightly connected to the water inlet and outlet interface 12, and the water inlet and outlet interface 12 is provided with a pressure control valve 13; the inner wall surface of the barrel wall 14 is provided with an annular rib plate 16 and a reinforcement ring 17 for reinforcement.

[0021] An internal circular tube support 18 is fixed on the top of the barrel wall 14. The internal circular tube support 18 has a rubber wrapping layer 191 that plays an elastic sealing role. The contact layer 192 on the top surface of the rubber wrapping layer 191 is flat, and the floating foundation 21 contacts the contact layer 192 on the top surface of the rubber wrapping layer 191 to form an elastic sealing contact.

[0022] After the floating foundation 21 of the floating unit is docked with the rubber wrapping layer 191 of the suction support, elastic sealing contact occurs, and the air compressor evacuates the air inside the barrel bottom 15 through the pressure control valve 13, so that the floating foundation 21 of the floating unit maintains a stable position support on the suction support. When the docking position of the floating foundation 21 and the suction support needs to be adjusted, air is input into the barrel bottom 15 through the pressure control valve 13 to form a slight high pressure. The floating foundation 21 is only adjusted by gravity and is not affected by the magnetic attraction. This solves the problem that the floating foundation is affected by the magnetic attraction after docking with the support and the alignment process is inconvenient to adjust.

[0023] It also includes mooring piles 51 with their bottoms inserted into the seabed bearing layer below the mud surface 6, and the mooring piles 51 are moored to the floating foundation 21 through mooring cables 52. There are three mooring piles 51, corresponding to the three suction caps.

[0024] The temporary wharf 3 is located on the side of the floating unit, and the temporary wharf 3 is composed of an upgradeable offshore operation platform. The bottom of the temporary wharf 3 is inserted into the seabed bearing layer below the mud surface 6, and the top of the temporary wharf 3 is exposed to the sea surface 4.

[0025] The present invention provides a method for constructing a negative pressure bearing platform for floating offshore wind power buoy foundation construction, comprising the following steps:

[0026] Step 1: The temporary wharf 3 is transported to a water depth of 20 to 30 m offshore by self-propelled or towed, or a fixed lifting platform is installed in the water depth of 20 to 30 m offshore to serve as the temporary wharf 3; after the platform pile legs are lowered to the seabed bearing layer below the mud surface 6, the temporary wharf 3 is lifted as a whole to a certain height above the sea surface 4.

[0027] Step 2: driving the mooring pile 51 deep into the seabed bearing layer below the mud surface 6, and then installing the mooring cable 52, with the other end of the mooring cable 52 being placed on the deck of the temporary wharf 3.

[0028] Step 3: Install the lower structure of the suction bearing platform, and the installation position ensures that the lifting capacity of the temporary wharf 3 can cover it; hoist the jacket 11, and pile the jacket 11 to the bottom and penetrate into the seabed bearing layer below the mud surface 6.

[0029] Step 4: Fix the barrel bottom 15 on the conduit rack 11 , and place the three barrel bottoms directly above the three conduit racks 11 respectively.

[0030] Step 5: Drag the floating foundation 21 to the top of the suction cylinder structure, adjust the three columns of the floating foundation 21, and place them respectively above the contact layer 192 of the rubber structure 19, and adjust the ballast water of the floating foundation 21 so that the floating foundation 21 moves vertically downward until it is in stable and sealed contact with the contact surface 192. At this time, the contact surface 192 is under a certain pressure.

[0031] Step 6: The other end of the mooring cable 52 is hoisted from the temporary dock 3 to the floating foundation, and then the connecting buckle of the mooring cable 52 is fixedly connected to the lifting lug of the floating foundation 21. The length of the mooring cable 52 is adjusted by using the tensioner to tension and fix the floating foundation 21 and the mooring pile 51 to limit the overall horizontal movement of the floating foundation 21.

[0032] Step seven: open the pressure control valve 13, start the suction cylinder water pump connected to the pressure control valve 13, extract a certain amount of water from the suction cylinder structure barrel wall 14 to form a negative pressure inside the suction cylinder structure barrel wall 14, and then close the pressure control valve 13 to ensure that the lower surface of the floating foundation 21 is tightly adsorbed on the rubber structure 19, limit the overall vertical movement of the floating foundation 21, and maintain a stable position support.

[0033] Step 8: Use the temporary wharf 3 to sequentially hoist the wind turbine tower 22, main engine 23, impeller and other wind turbine equipment.

[0034] Step nine: Open the pressure control valve 13 to release the negative pressure in the suction cylinder structure and remove the vertical movement restriction of the floating unit.

[0035] Step 10: Remove all the shackles connected to the active ends of the mooring cables 52 to release the horizontal movement restrictions of the floating unit. The active ends of the mooring cables 52 are hoisted to the deck of the temporary dock 3 for storage. Before removing the mooring cables 52, the towing vessel is in place, and the towing lashing work is carried out simultaneously during the removal of the mooring cables 52.

[0036] Step 11: Adjust the ballast water of the floating foundation 21 to make the floating foundation 21 float up and separate from the contact surface 192 by a certain distance.

[0037] Step 12: Use a tugboat to tow the floating unit to the designed location of the wind farm for installation.

[0038] Working principle: When in use, the floating foundation 21 is towed to the top of the contact layer 192 of the suction platform, so that the three columns of the floating foundation 21 are aligned with the three contact surfaces 192 respectively, and then the ballast water of the floating foundation 21 is adjusted so that its bottom is in stable and sealed contact with the contact surface 192. At this time, the contact surface 192 is under a certain pressure, and then the connecting buckle of the mooring cable 52 is fixedly connected to the lifting ear of the floating foundation 21, and the length of the mooring cable 52 is adjusted to tighten and fix the floating foundation 21 and the mooring pile 51. Then, a water pump is used to extract a certain amount of water from the barrel wall 14 of the suction cylinder structure to form a negative pressure inside the barrel wall 14 of the suction cylinder structure, and the floating foundation 21 is stably adsorbed on the suction platform. Finally, the temporary dock 3 is used to hoist the tower 22, the main engine 23 and other wind turbine equipment.

Claims

1. A method for constructing a negative pressure cap for floating offshore wind power buoy foundation construction, characterized in that: include: The floating foundation (21) is docked with the suction bearing platform of the negative pressure bearing platform for the construction of the floating offshore wind power floating foundation, so that negative pressure is formed inside the barrel wall (14) of the suction cylinder structure, and the lower surface of the floating foundation (21) is tightly adsorbed on the rubber structure (19), limiting the overall vertical movement of the floating foundation (21), thereby maintaining a stable position support construction process.

2. The construction method of the negative pressure cap for floating offshore wind power buoy foundation construction according to claim 1, characterized in that: The construction process includes towing the floating foundation (21) to the top of the suction cylinder structure, adjusting the three columns of the floating foundation (21) and placing them respectively above the contact layer (192) of the rubber structure (19), and adjusting the ballast water of the floating foundation (21) so that the floating foundation (21) moves vertically downward until it is in stable and sealed contact with the contact surface (192), and at this time, the contact surface (192) is subjected to a certain pressure.

3. The construction method of the negative pressure cap for floating offshore wind power buoy foundation construction according to claim 2, characterized in that: The construction process also includes hoisting the other end of the mooring cable (52) from the temporary wharf (3) to the floating foundation, then fixing the connecting buckle of the mooring cable (52) to the lifting lug of the floating foundation (21), and using a tensioner to adjust the length of the mooring cable (52) so that the floating foundation (21) and the mooring pile (51) are tensioned and fixed, so as to limit the overall horizontal movement of the floating foundation (21).

4. The construction method of the negative pressure cap for floating offshore wind power buoy foundation construction according to claim 3, characterized in that: The construction process also includes opening the pressure control valve (13), starting the suction cylinder water pump connected to the pressure control valve (13), and extracting a certain amount of water from the suction cylinder structure barrel wall (14) to form a negative pressure inside the suction cylinder structure barrel wall (14), and then closing the pressure control valve (13) to ensure that the lower surface of the floating foundation (21) is tightly adsorbed on the rubber structure (19), thereby limiting the overall vertical movement of the floating foundation (21) and maintaining a stable position support.

5. The construction method of the negative pressure cap for floating offshore wind power buoy foundation construction according to claim 4, characterized in that: The construction process also includes opening the pressure control valve (13) to release the negative pressure in the suction cylinder structure and remove the vertical movement restriction of the floating unit; The movable ends of the mooring cables (52) are all connected to the shackles to release the horizontal movement restriction of the floating unit. The movable ends of the mooring cables (52) are hoisted to the deck of the temporary dock (3) for storage. Before the mooring cables (52) are disassembled, the towing vessel is in place, and the towing and lashing work is carried out simultaneously during the disassembly process of the mooring cables (52).

6. The construction method of the negative pressure cap for floating offshore wind power buoy foundation construction according to claim 5, characterized in that: The construction process also includes adjusting the ballast water of the floating foundation (21) so that the floating foundation (21) floats up and separates from the contact surface (192); and using a tugboat to tow the floating unit to the designed point of the wind farm for installation.

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