Strategy method for water injection and drainage ballast of large floating wind turbine bottom-supported offshore wharf

Abstract

The invention discloses a strategy method for water injection and drainage ballast of a large floating wind turbine bottom-supported offshore wharf. The strategy method comprises the strategy process of achieving stable posture of a floating wind turbine foundation and carrying out water injection sinking. Due to the fact that the middle column of the floating type wind turbine foundation is clamped by the pile gripper to provide vertical sliding guide, it is guaranteed that the posture of the floating type wind turbine foundation is stable in the water injection sinking process of three side columns, and the problem that the posture of the floating type wind turbine foundation is prone to being affected by sea waves when water is directly injected into the anchoring foundation to sink to the seabed is solved.

Description

Technical Field

[0001] This invention relates to a strategy and method for installing a bottom-mounted offshore terminal for a large floating wind turbine with ballast for water injection and drainage, belonging to the field of floating wind turbine installation technology. Background Technology

[0002] When large floating wind turbines are assembled at near-shore wharves, it is necessary to ensure the stability of the floating wind turbine foundation. Therefore, the floating wind turbine foundation needs to be placed on the seabed to ensure the stability of the assembly process.

[0003] The existing water-injection counterweight sinking and bottoming technology, as seen in Chinese Patent Publication No. CN221525016U, can sink and settle to the seabed by directly injecting water into the anchoring foundation. However, the sinking process is easily affected by sea waves, causing the attitude to shift. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a strategy and method for a bottom-mounted offshore terminal for large floating wind turbines with injection, drainage, and ballast.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a strategy and method for a bottom-mounted offshore terminal for large floating wind turbines that requires injection and drainage ballast, comprising: The strategy process for achieving stable attitude of the floating wind turbine foundation through water injection and sinking.

[0007] The strategy process includes berthing and alignment; the tugboat introduces the floating wind turbine foundation into the installation position, and the two side posts are softly abutted to the two mooring piles equipped with fenders in sequence, with the fenders providing flexible buffer and anti-collision protection; the pile gripper on the self-elevating work platform performs circumferential clamping on the central column of the floating wind turbine foundation without releasing it, providing vertical sliding guidance, and completing the initial positioning and attitude stabilization in the working water area.

[0008] The strategy process also includes controlled descent and attitude correction; opening the inlet valve and injecting water into the ballast tank through the pump and one-way inflow valve, distributing the water injection volume to the three side pillars of the floating wind turbine foundation, and coordinating with the clamping control of the pile gripper to achieve draft and attitude adjustment, so that the floating wind turbine foundation is stably placed on the adjustable flexible cushion layer distributed in the seabed.

[0009] The strategy process also includes temporary mooring and locking; mooring cables are laid on the two mooring piles on the side of the jack-up platform, and the two mooring cables form a symmetrical cross-tether; the third side post of the floating wind turbine foundation located on the non-mooring side is directly secured to a single mooring pile in the sea area near the installation position by two mooring cables.

[0010] The strategy process also includes in-situ assembly and rolling operations; the main crane and the auxiliary crane work together on the self-elevating auxiliary installation platform to complete the segmented hoisting and on-site docking of the tower, nacelle, hub and blades.

[0011] The strategy process also includes releasing the temporary mooring; after the entire machine is assembled in situ, the mooring cables are released and retrieved in sequence, releasing the temporary constraints formed by the mooring piles and the circumferential locking guide cable hoops, while the pile gripper remains in place.

[0012] The strategy process also includes controlled ascent and relocation; the air intake valve is opened and air is pumped into the ballast tank through the one-way inflow valve B via the compressed air pump; the water in the ballast tank inside the side pillar flows to the drain valve through the double check valve and is discharged into the open sea; the floating wind turbine foundation is controlled to rise and detach from the distributed adjustable flexible cushion support surface.

[0013] The self-elevating working platform and the pile legs are installed in a height-adjustable manner, and the pile legs are stabilized by being inserted into the seabed through pile shoes.

[0014] The beneficial effects of this invention are as follows: Since the central column of the floating wind turbine foundation is clamped by the pile clamp to provide vertical sliding guidance, the attitude of the floating wind turbine foundation is ensured during the process of sinking with water at the three side columns. This solves the problem that the attitude of the foundation is easily affected by waves when it sinks directly into the anchor foundation and sits on the seabed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structural distribution of the side columns in the floating wind turbine foundation of this invention; Figure 2 This is a schematic diagram of the structure for the docking and alignment step of the present invention; Figure 3 This is a schematic diagram of the structure for the temporary mooring locking step of the present invention; Figure 4 This is a structural schematic diagram of the in-situ assembly and rolling operation steps of the present invention; Figure 5 This is a schematic diagram of the structure for the temporary mooring release step of the present invention; Detailed Implementation

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

[0017] like Figures 1 to 5 As shown.

[0018] This application discloses a strategy and method for a bottom-mounted offshore terminal for a large floating wind turbine with injection and drainage ballast, the process of which is implemented according to the following steps.

[0019] Step 1, Mooring and Alignment: The tugboat guides the floating wind turbine foundation 14 into the installation position, and the two side posts are softly moored to the two mooring piles 19 equipped with fenders 20 in sequence. The fenders 20 provide flexible buffer and anti-collision protection. The pile gripper 12 on the self-elevating work platform 7 clamps the central column of the floating wind turbine foundation 14 in a circumferential manner without releasing it, providing vertical sliding guidance, and completing the initial positioning and attitude stabilization in the working water area.

[0020] Because the central column of the floating wind turbine foundation 14 is clamped by the pile gripper 12 to provide vertical sliding guidance, the attitude of the floating wind turbine foundation 14 is kept stable during the process of sinking with water at the three side columns 30. This solves the problem that the attitude of the floating wind turbine foundation 14 is easily affected by waves when it sinks directly to the seabed after being injected with water.

[0021] The self-elevating working platform 7 and the pile legs 10 can be installed in a height-adjustable manner, and the pile legs 10 are inserted into the seabed 29 for stability by the pile boots 11.

[0022] Step 2, controlled descent and attitude correction: Open the inlet valve 161 and pump water into the ballast tank 13 via the pump 163 and the one-way inflow valve 162. Observe the liquid level height through the water level detection sensor 101. The ballast tank 13 has a multi-layered staggered perforated structure with a baffle 102 inside the tank, which is used to reduce free surface sloshing and stabilize pressure and liquid level measurement. Distribute the water injection volume to the three side columns 30 of the floating wind turbine foundation 14 as needed. With the clamping control of the pile gripper 12, the draft and attitude are adjusted so that the floating wind turbine foundation 14 is stably placed on the adjustable flexible cushion layer 5 distributed in the seabed 29.

[0023] Step 3, Temporary Mooring Locking: The circumferential locking guide cable hoop 22 is installed on the upper part of the three side posts of the floating wind turbine foundation 14 in a sleeve manner. The buffer pad 23 is attached to the contact between the circumferential locking guide cable hoop 22 and the side posts of the floating wind turbine foundation 14 to disperse the surface pressure. The guide hole 24 is used to guide the mooring cable 21 to pass through. The two mooring piles 19 on the side of the self-elevating working platform 7 are each equipped with a mooring cable 21, and the two mooring cables 21 form a symmetrical cross tie. The third side post of the floating wind turbine foundation 14 located on the non-mooring side is directly secured by a single mooring pile 19 in the sea area near the installation position with two mooring cables 21. Each mooring cable 21 is tensioned to the design pretension through the guide hole 24, and together with the continuous clamping of the pile gripper 12, it forms a planar constraint and attitude lock.

[0024] Step 4, In-situ Assembly and Rolling Operation: The main crane 8 and the auxiliary crane 9 work together on the self-elevating auxiliary installation platform 7 to complete the segmented hoisting and on-site docking of the tower 15, nacelle 16, hub 17, and blades 18. The left and right work stations alternate. While one side is carrying out in-situ assembly, the other side receives the next set of floating wind turbine foundations 14 and completes the berthing, initial positioning, and temporary mooring preparations. The overall installation efficiency is improved by rolling.

[0025] Step 5, release the temporary mooring: After the entire machine is assembled in its original position, release and retrieve each mooring cable 21 in sequence to release the temporary constraint formed by the mooring bollard 19 and the circumferential locking guide cable hoop 22. The bollard gripper 12 continues to hold the machine to maintain its attitude and position stability.

[0026] Step 6, Controlled Ascent and Relocation: Open the air inlet valve 141 and send air to the ballast tank 13 through the one-way inflow valve B144 and the compressed air pump 143. The water in the ballast tank 13 inside the side pillar 30 flows to the drain valve 151 through the double check valve 152 and is discharged into the open sea. The floating wind turbine foundation 14 is controlled to rise and detach from the distributed adjustable flexible cushion layer 5 support surface. After confirming that the rising attitude is stable, release the pile holder 12 and relocate it by tugboat or anchor it as needed.

Claims

1. A strategy and method for a bottom-mounted offshore terminal for large floating wind turbines with ballast injection and drainage, characterized in that, include: The strategy process of achieving stable attitude of floating wind turbine foundation (14) through water injection and sinking.

2. The strategy and method for a bottom-mounted offshore terminal for large floating wind turbines with ballast injection and drainage as described in claim 1, characterized in that: The strategy process includes berthing and positioning; the tugboat introduces the floating wind turbine foundation (14) into the installation position, and the two side columns are softly abutted to the two mooring piles (19) equipped with fenders (20) in sequence. The fenders (20) provide flexible buffer and anti-collision protection; the pile gripper (12) on the self-elevating work platform (7) performs circumferential clamping on the central column of the floating wind turbine foundation (14) without releasing it, providing vertical sliding guidance, and completing the initial positioning and attitude stabilization in the working water area.

3. The strategy and method for a bottom-mounted offshore terminal for large floating wind turbines with ballast injection and drainage as described in claim 2, characterized in that: The strategy process also includes controlled descent and attitude correction; opening the inlet valve (161) and injecting water into the ballast tank (13) through the pump (163) and the one-way inflow valve (162) to distribute the water injection volume to the three side columns (30) of the floating wind turbine foundation (14), and cooperating with the clamping control of the pile gripper (12) to achieve draft and attitude adjustment, so that the floating wind turbine foundation (14) is stably placed on the adjustable flexible cushion layer (5) distributed in the seabed (29).

4. The strategy and method for a bottom-mounted offshore terminal for large floating wind turbines with ballast injection and drainage as described in claim 3, characterized in that: The strategy process also includes temporary mooring locking; two mooring piles (19) on the side of the self-elevating work platform (7) are each covered with mooring cables (21), and the two mooring cables (21) form a symmetrical cross-tethering; the third side post of the floating wind turbine foundation (14) located on the non-mooring side is directly secured by a single mooring pile (19) in the sea area near the installation position with two mooring cables (21).

5. The strategy and method for a bottom-mounted offshore terminal for a large floating wind turbine with ballast injection and drainage as described in claim 3, characterized in that: The strategy process also includes in-situ assembly and rolling operations; the main crane (8) and the auxiliary crane (9) work together on the self-elevating auxiliary installation platform (7) to complete the segmented hoisting and on-site docking of the tower (15), nacelle (16), hub (17) and blades (18).

6. The strategy and method for a bottom-mounted offshore terminal for a large floating wind turbine with ballast injection and drainage as described in claim 3, characterized in that: The strategy process also includes releasing the temporary mooring; after the whole machine is assembled in situ, the mooring cables (21) are released and retrieved in sequence to release the temporary constraint formed by the mooring pile (19) and the circumferential locking guide cable hoop (22), while the pile gripper (12) continues to hold.

7. The strategy and method for a bottom-mounted offshore terminal for a large floating wind turbine with ballast injection and drainage as described in claim 3, characterized in that: The strategy process also includes controlled ascent and relocation; the air inlet valve (141) is opened and air is sent to the ballast tank (13) through the one-way inflow valve B (144) via the compressed air pump (143); the water in the ballast tank (13) inside the side column (30) flows to the drain valve (151) through the double check valve (152) and is discharged into the open sea; the floating wind turbine foundation (14) is controlled to rise and detach from the distributed adjustable flexible cushion layer (5) support surface.

8. The strategy and method for a bottom-mounted offshore terminal for a large floating wind turbine with ballast for water injection and drainage as described in claim 2, characterized in that: The self-elevating working platform (7) and the pile legs (10) can be installed in a height-adjustable manner, and the pile legs (10) are fixed by being inserted into the seabed (29) by the pile boots (11).

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