A method of assembling a floating wind turbine for deep offshore use

Abstract

The application discloses a kind of assembly methods suitable for deep sea floating wind turbine, comprising: S101, deep sea floating wind turbine is carried out shore-based assembly in wharf assembly station separately;S102, for the deep sea floating wind turbine after assembly, the gravity center of gravity adjustable support arm is lowered to the lowest position to enter operation and maintenance posture, deep sea floating wind turbine is towed by tugboat to target wind field sea with operation and maintenance posture, and the anchoring and cable connection of deep sea floating wind turbine are completed;S103, the gravity center of gravity adjustable support arm of deep sea floating wind turbine is raised to enter operation posture.The application is suitable for the assembly method of deep sea floating wind turbine, which aims to improve the stability of deep sea floating wind turbine when facing extreme weather at sea, and reduce the risk caused by sea level fluctuation and weather factors.

Description

Technical Field

[0001] This invention relates to assembly technology in the field of offshore wind power, specifically to an assembly method applicable to floating wind turbine units in deep-sea areas. Background Technology

[0002] The offshore wind power industry will develop towards deep-sea and large-capacity applications. Currently, due to their large size and high center of gravity, the assembly method for floating offshore wind turbines involves first towing the floating platform to the target sea area and anchoring it, and then using large lifting vessels to install components such as the tower, generator, converter, and blades. Because of waves and currents at sea level, this assembly method is difficult, has a low safety factor, is time-consuming, and heavily relies on large lifting vessels, thus increasing assembly costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an assembly method for deep-sea floating wind turbines, which aims to improve the stability of deep-sea floating wind turbines when facing extreme weather at sea and reduce the risks caused by sea level fluctuations and weather factors.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] An assembly method for floating wind turbines suitable for deep-sea applications includes:

[0006] S101 involves assembling deep-sea floating wind turbines separately at the dock assembly station on shore.

[0007] S102, for the assembled deep-sea floating wind turbine, lower the center of gravity of the adjustable boom to the lowest position to enter the operation and maintenance posture, tow the deep-sea floating wind turbine to the target wind farm sea in the operation and maintenance posture by the tugboat, and complete the anchoring and cable connection of the deep-sea floating wind turbine.

[0008] S103 raises the center of gravity of the adjustable boom of the deep-sea floating wind turbine to enter the operating posture.

[0009] Optionally, when the deep-sea floating wind turbine is assembled on shore separately at the dock assembly station in step S101, it means that the various subsystems of the deep-sea floating wind turbine are assembled in the order after pre-simulation optimization. The subsystem refers to the constituent unit of the deep-sea floating wind turbine, and the center-of-gravity adjustable support arm is a subsystem of the deep-sea floating wind turbine.

[0010] Optionally, obtaining the pre-optimized simulation sequence includes:

[0011] S201, Different assembly schemes are determined for each subsystem of the deep-sea floating wind turbine, and the parallel assembly and front-to-back assembly methods of each subsystem are different under different assembly schemes.

[0012] S202, calculate the assembly time cost for different assembly schemes;

[0013] S203, select the assembly scheme with the minimum assembly time cost, and use the parallel assembly of each subsystem and the order of assembly as the obtained simulation optimization order.

[0014] Optionally, the center-of-gravity adjustable support arm includes a longer unit support arm and a shorter counterweight support arm. The unit support arm and the counterweight support arm are connected to each other and have a hinged mounting seat in the middle for mounting the center-of-gravity adjustable support arm. The counterweight support arm is also connected to a drive mechanism for driving the center-of-gravity adjustable support arm to rotate relative to the hinged mounting seat to adjust the center-of-gravity height of the fan installed at the end of the unit support arm.

[0015] Optionally, the end of the counterweight support arm is provided with a counterweight water tank, which is equipped with an electronic drain valve and a water inlet with a water pump for controlled adjustment of the water volume in the counterweight water tank.

[0016] Optionally, the lower part of the counterweight water tank is provided with a counterweight support for installation and fixing onto the wind turbine base. The top surface of the counterweight support is provided with a positioning groove for fixing the counterweight water tank when it is placed into the positioning groove during wind turbine operation and power generation. The surface of the positioning groove is provided with a buffer layer to prevent the counterweight water tank from deforming.

[0017] Optionally, the counterweight support is cylindrical, and the positioning groove is an arc-shaped groove.

[0018] Optionally, both the unit support arm and the counterweight support arm are hollow structures, and the interior of the spatial structure is provided with annular reinforcing ribs.

[0019] Optionally, a reinforcing connecting rod is also connected between the unit support arm and the counterweight support arm, and the reinforcing connecting rod, the unit support arm, and the counterweight support arm are arranged in a triangular shape.

[0020] Optionally, the angle between the unit boom and the counterweight boom is an obtuse angle, the drive mechanism is a winch mechanism, and the traction rope of the winch mechanism is connected to the counterweight boom.

[0021] Optionally, the winch mechanism has two traction ropes with opposite traction directions, and each traction rope is connected to one of the fan arm support devices with lifting and retraction functions, so that the two fan arm support devices share the same winch mechanism.

[0022] Optionally, the hoisting mechanism is located in the middle of the two fan arm support devices that share the same hoisting mechanism, and the two fan arm support devices that share the same hoisting mechanism are arranged symmetrically with respect to the hoisting mechanism.

[0023] Optionally, when the drive mechanism drives the center-of-gravity adjustable support arm to rotate relative to the hinged mounting base to adjust the center-of-gravity height of the fan installed at the end of the unit support arm, the rotation surface is parallel to the fan sweeping surface of the fan installed at the end of the unit support arm.

[0024] Compared with prior art, the present invention has the following main advantages:

[0025] 1. This invention utilizes an adjustable-center-of-gravity offshore floating wind turbine platform, which is assembled on shore at a nearby dock and then towed to the wind farm for anchoring and power generation. This can improve the stability of the turbine in the face of extreme weather at sea and reduce the risks caused by sea level fluctuations and weather factors.

[0026] 2. This invention allows for the assembly of all subsystems and the hoisting of the entire floating wind turbine platform to be carried out on shore, reducing reliance on large hoisting vessels and rental costs. When the turbine enters the maintenance posture, it can be laid flat and nearly parallel to the sea level using an adjustable center of gravity, reducing the hoisting height and the tonnage of the hoisting vessel, and improving operational safety. Finally, after the entire turbine is hoisted, it can be directly towed to the target sea area by a tugboat, avoiding installation operations in deep sea. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the basic process of the method in an embodiment of the present invention.

[0028] Figure 2 This is a structural schematic diagram of the working state of the adjustable center of gravity support arm according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the adjustable center of gravity support arm in a typhoon-resistant state according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the combined working state of the adjustable center of gravity support arm according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the adjustable center of gravity boom in a combined typhoon-resistant configuration according to an embodiment of the present invention.

[0032] Legend: 1. Unit support arm; 2. Counterweight support arm; 3. Counterweight water tank; 4. Reinforcing connecting rod; 5. Counterweight support; 6. Drive mechanism; 7. Hinge mounting base. Detailed Implementation

[0033] like Figure 1As shown, the assembly method for deep-sea floating wind turbines in this embodiment includes:

[0034] S101 involves assembling deep-sea floating wind turbines separately at the dock assembly station on shore.

[0035] S102, for the assembled deep-sea floating wind turbine, lower the center of gravity of the adjustable boom to the lowest position to enter the operation and maintenance posture, tow the deep-sea floating wind turbine to the target wind farm sea in the operation and maintenance posture by the tugboat, and complete the anchoring and cable connection of the deep-sea floating wind turbine.

[0036] S103 raises the center of gravity of the adjustable boom of the deep-sea floating wind turbine to enter the operating posture.

[0037] In step S101 of this embodiment, when the deep-sea floating wind turbine is assembled separately on shore at the dock assembly station, it refers to assembling the various subsystems of the deep-sea floating wind turbine in a pre-simulated and optimized sequence. Each subsystem refers to a constituent unit of the deep-sea floating wind turbine, and the adjustable-center-of-gravity support arm is one such subsystem. The on-site visualization 3D assembly system used in this invention can simulate the assembly steps of each subsystem to obtain the pre-simulated and optimized assembly sequence, effectively shortening the construction period.

[0038] In this embodiment, obtaining the pre-optimized sequence after simulation includes:

[0039] S201, Different assembly schemes are determined for each subsystem of the deep-sea floating wind turbine, and the parallel assembly and front-to-back assembly methods of each subsystem are different under different assembly schemes.

[0040] S202, calculate the assembly time cost for different assembly schemes; the time cost for each subsystem can be obtained through simulation. The essence of calculating the assembly time cost for different assembly schemes is to take the time cost of the parallel assembled subsystems, take the time cost with the longest time cost, and then sum the time costs of the subsystems assembled before and after to obtain the assembly time cost of the assembly scheme.

[0041] S203, select the assembly scheme with the minimum assembly time cost, and use the parallel assembly of each subsystem and the order of assembly as the obtained simulation optimization order.

[0042] In this embodiment, the subsystems of the deep-sea floating wind turbine include a rotor system (for converting wind energy into mechanical energy), a main unit system (control unit), an electrical and control system, a floating body subsystem (floating platform), an L-shaped boom subsystem, a mooring assembly, and a counterweight tank 3. The floating platform is connected to the mooring assembly at a single connection point for single-point mooring. The pair of booms housing the wind turbine and the mooring assembly are located on different sides of the floating platform. In step S102, when the deep-sea floating wind turbine is towed to the target wind farm in a maintenance posture by a tugboat, the floating platform is towed using the mooring assembly. This ensures that during towing, the pair of booms housing the wind turbine and the mooring assembly are located on different sides of the floating platform, achieving stable navigation during towing and preventing vibrations caused by waves. The floating platform preferably has a symmetrical structure, with its axis of symmetry being the line connecting the connection point of the mooring assembly and the midpoint of the connection line between the pair of booms. This ensures stable and reliable passive yaw during automatic tracking of wind direction changes.

[0043] like Figure 2 and Figure 3 As shown, in this embodiment, the center-of-gravity adjustable support arm includes a longer unit support arm 1 and a shorter counterweight support arm 2. The unit support arm 1 and the counterweight support arm 2 are connected to each other and have a hinged mounting seat 7 in the middle for mounting the center-of-gravity adjustable support arm. The counterweight support arm 2 is also connected to a drive mechanism 6 for driving the center-of-gravity adjustable support arm to rotate relative to the hinged mounting seat 7 to adjust the center-of-gravity height of the wind turbine installed at the end of the unit support arm 1. This enables the unit to achieve adjustable center of gravity, so that the center-of-gravity height at the end of the unit support arm 1 is different at different rotation angles. This solves the problem of the high and non-adjustable center of gravity of wind turbines in traditional column-type towers, improves the safety of wind turbine generators under extreme conditions such as typhoons in deep sea areas, and has the advantages of lightweight, stable structure, and adjustable center of gravity.

[0044] like Figure 2 and Figure 3 As shown, in this embodiment, a counterweight water tank 3 is provided at the end of the counterweight support arm 2. The counterweight water tank 3 is equipped with an electronic drain valve and a water inlet with a water pump for controlled adjustment of the water volume in the counterweight water tank 3. The counterweight water tank 3 stores seawater, so that the support arm formed by the counterweight support arm 2 and the counterweight water tank 3 has a weight similar to (but not equal to) that of the support arm on the other side, which is formed by the unit support arm 1 and the support arm on the other side where the nacelle and impeller assembly are installed. This reduces the torque difference between the left and right sides and can reduce the stress on the center-of-gravity adjustable support arm. Moreover, by fixing the counterweight water tank 3 to the end of the counterweight support arm 2, the mass distribution of the entire center-of-gravity adjustable support arm can be improved by adjusting the seawater volume inside the counterweight water tank 3 during the lifting and lowering process, thus solving the problem of excessive system load and stress on the support arm during the lifting and lowering process of the center-of-gravity adjustable support arm.

[0045] like Figure 2 and Figure 3 As shown, in this embodiment, the lower part of the counterweight water tank 3 is provided with a counterweight support 5 for mounting and fixing it to the wind turbine base. The top surface of the counterweight support 5 has a positioning groove for securing the counterweight water tank 3 when it is placed into the positioning groove during wind turbine operation. A buffer layer is provided on the surface of the positioning groove to prevent deformation of the counterweight water tank 3. In this embodiment, the counterweight support 5 is cylindrical, and the positioning groove is an arc-shaped groove, resulting in a larger contact surface. This allows the force between the counterweight water tank 3 and the positioning groove to be distributed across the arc-shaped contact surface, improving the protection against deformation of the counterweight water tank 3. In this embodiment, the counterweight water tank 3 stores seawater, increasing the mass on one side of the lower end of the counterweight support arm 2, thus improving the mass distribution of the adjustable center of gravity support arm. The counterweight torque on the side of the counterweight support arm 2 is comparable to the total torque of the wind turbine and tower on the side of the unit support arm 1. This not only reduces the system load on the hinge system but also helps to achieve an adjustable center of gravity for the wind turbine unit.

[0046] In this embodiment, the unit boom 1 is 107 meters long, and the counterweight boom 2 is 38.05 meters long. The unit boom 1 and the counterweight boom 2 are preferably made of low-density, high-strength materials. For example, in this embodiment, the unit boom 1 and the counterweight boom 2 are made of coated Q960E steel, which combines lightweight and fatigue resistance. The tower cross-sections of the unit boom 1 and the counterweight boom 2 are elliptical. The major axis of the elliptical cross-section of the unit boom 1 is 4 meters, and the minor axis is 2 meters. The major axis of the elliptical cross-section of the counterweight boom 2 is 6 meters, and the minor axis is 3 meters.

[0047] To address the requirements for lightweight, fatigue-resistant, and bending-resistant wind turbine support devices under extreme conditions such as typhoons, this embodiment features hollow structures for both the turbine arm 1 and the counterweight arm 2, with annular reinforcing ribs inside the spatial structure. These annular reinforcing ribs enhance the strength of the turbine arm 1 and the counterweight arm 2, meeting the requirements for lightweight, fatigue-resistant, and bending-resistant wind turbine support devices under extreme conditions such as typhoons. As an optional implementation, this embodiment uses annular reinforcing ribs spaced 0.8 meters apart, longitudinal reinforcing ribs spaced 0.5 meters apart, and horizontal diaphragms with openings in the center are installed every 4 meters.

[0048] like Figure 2 and Figure 3 As shown, in this embodiment, a reinforcing connecting rod 4 connects the unit boom 1 and the counterweight boom 2, forming a triangular arrangement between the reinforcing connecting rod 4, the unit boom 1, and the counterweight boom 2. This triangular arrangement creates a stable triangular structure, addressing the issue of insufficient structural stability of the unit under extreme conditions such as typhoons. The number of reinforcing connecting rods 4 can be selected as needed; in this embodiment, two reinforcing connecting rods 4 are used, but more can also be employed, thus achieving higher structural strength at a lower cost through multiple smaller reinforcing connecting rods 4.

[0049] To simplify the rotation drive mechanism of the center-of-gravity adjustable outrigger, such as Figure 4 and Figure 5 As shown, in this embodiment, the included angle between the unit support arm 1 and the counterweight support arm 2 is an obtuse angle. The drive mechanism 6 is a winch mechanism, and the traction rope of the winch mechanism is connected to the counterweight support arm 2. Since the included angle between the unit support arm 1 and the counterweight support arm 2 is an obtuse angle, the opening angle of the unit support arm 1 is less than 90°. Thus, the self-weight of the unit support arm 1 can be used to adjust the center of gravity of the unit support arm 1. Moreover, the drive mechanism 6 only needs to provide a winch mechanism with unidirectional pulling force, which greatly simplifies the structure and volume of the drive mechanism 6.

[0050] To further address the issue of insufficient structural stability of the generating units under extreme conditions such as typhoons, such as Figure 4 and Figure 5 As shown, in this embodiment, the winch mechanism has two traction ropes with opposite traction directions, and each traction rope is connected to a wind turbine boom support device with lifting and retraction functions. This allows the two wind turbine boom support devices to share the same winch mechanism. By using a single winch to simultaneously drive the left and right wind turbine boom support devices, the force balance of the two wind turbine boom support devices is ensured, which can solve the problem of insufficient structural stability of the unit under extreme conditions such as typhoons. In this embodiment, the winch mechanism is located in the middle of the two wind turbine boom support devices sharing the same winch mechanism, and the two wind turbine boom support devices sharing the same winch mechanism are symmetrically arranged with respect to the winch mechanism.

[0051] In this embodiment, when the drive mechanism 6 drives the center-of-gravity adjustable support arm to rotate relative to the hinged mounting base 7 to adjust the center-of-gravity height of the fan installed at the end of the unit support arm 1, the rotation surface is parallel to the fan's swept surface at the end of the unit support arm 1. The support arm adjusts the center of gravity by rotating vertically, and the rotation area is always parallel to the fan's swept surface. This solves the problem that in existing center-of-gravity adjustable support arms, the fan is not directly facing the incoming airflow, resulting in uneven force on the blades. Undoubtedly, based on the requirement to drive the counterweight support arm 2, the drive mechanism 6 can adopt the required implementation method, including electric, hydraulic, and pneumatic drives. Under various drive methods, direct drive or indirect drive through a transmission mechanism can also be used as needed. As an optional implementation, in this embodiment, the drive mechanism 6 is a winch mechanism. The traction rope of the winch mechanism is connected to the counterweight arm 2. The lifting function is realized through the winch mechanism. Under normal power generation conditions, the winch mechanism tightens to raise the center of gravity adjustable arm. Under cutting conditions, the winch mechanism relaxes to lower the center of gravity adjustable arm, thereby lowering the center of gravity.

[0052] The working process of the adjustable center of gravity arm in this embodiment is as follows: See Figure 1Under normal wind turbine power generation conditions, the drive mechanism 6 tightens the traction rope (or hinge), causing the turbine boom 1 to rise around the hinged mounting base 7, while the counterweight boom 2 lowers. The counterweight water tank 3, connected to the counterweight boom 2, is placed on the counterweight support 5, thus raising the wind turbine's center of gravity. At this time, the mass of the counterweight boom 2 side is equivalent to the mass of the turbine boom 1 side, reducing the torque difference between the two sides and the stress on the boom. After completing the above process, the hinge is fixed by the locking system of the drive mechanism 6, ensuring that the adjustable boom no longer moves. (Reference) Figure 2 During typhoon-resistant shear-out operation of the wind turbine, the drive mechanism 6 loosens the traction rope (or hinge) by a certain length and then fixes it back in place. During this process, the turbine boom 1 is lowered around the hinged mounting base 7, while the counterweight boom 2 rises. The counterweight water tank 3, connected to the counterweight boom 2, is lifted from the counterweight support 5, thus lowering the wind turbine's center of gravity. At this time, the counterweight boom 2 gains additional mass from the counterweight water tank 3, making its total mass comparable to that of the turbine boom 1, reducing the torque difference between the two sides and significantly reducing the stress on the boom. After completing the above process, the hinge is fixed by the locking system of the drive mechanism 6, ensuring that the center-of-gravity adjustable boom no longer moves. After the winch mechanism is fixed to the floating platform and launched from the dock, the center-of-gravity adjustable boom is first connected to the winch mechanism and the two tower top fixing points via shore-based hoisting equipment. A hydraulic mechanism is then used to connect the two ends of the center-of-gravity adjustable boom to ensure safe extension and retraction. After the adjustable boom is installed, it is simultaneously lowered horizontally using a winch mechanism until it is nearly parallel to the sea level. Once the boom is at this near-parallel angle, the engine room height decreases by approximately three-fifths compared to its operating position. Combined with the height difference between the dock and the sea level, a large-tonnage crane with a relatively low profile is sufficient to install the main engine subsystem, impeller subsystem, and counterweight subsystem (counterweight tank 3). The electrical and control subsystem and mooring subsystem (mooring components) are installed and secured at the dock. After integration and assembly of all subsystems at the dock, they are towed by a large specialized tugboat to the target wind farm area in the deep sea for mooring, anchoring, and cable connection. After all preparations are completed, the winch mechanism slowly raises the adjustable boom to its operating position, and grid connection for power generation begins at an appropriate time. The adjustable boom can be raised and lowered using a winch mechanism. When raised, it enters the power generation operation mode, and when lowered, it enters the maintenance mode. Entering the maintenance mode will greatly reduce the installation height of the wind turbine.

[0053] In summary, traditional offshore wind turbines involve transporting each system separately to the target wind farm and then assembling them by large offshore lifting barges under suitable weather conditions, which is both difficult and costly. This embodiment addresses the challenges of assembling deep-sea floating wind turbines, specifically targeting large-capacity floating wind turbines in deep-sea environments. Its greatest advantage is that it replaces the traditional offshore lifting of floating wind turbines with near-shore base lifting. After assembly, the turbines are towed to the target offshore wind farm by tugboats, eliminating the need for large lifting barges and the deep-sea lifting process, thus significantly reducing lifting costs and risks.

[0054] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An assembly method for floating wind turbine generators suitable for deep-sea applications, characterized in that, include: S101 involves assembling deep-sea floating wind turbines separately at the dock assembly station on shore. S102, for the assembled deep-sea floating wind turbine, lower the center of gravity of the adjustable boom to the lowest position to enter the operation and maintenance posture, tow the deep-sea floating wind turbine to the target wind farm sea in the operation and maintenance posture by the tugboat, and complete the anchoring and cable connection of the deep-sea floating wind turbine. S103 raises the center of gravity of the adjustable outrigger of the deep-sea floating wind turbine to enter the operating posture. The center-of-gravity adjustable support arm includes a longer unit support arm (1) and a shorter counterweight support arm (2). The unit support arm (1) and the counterweight support arm (2) are connected to each other and have a hinged mounting base (7) in the middle for mounting the center-of-gravity adjustable support arm. The counterweight support arm (2) is also connected to a drive mechanism (6) for driving the center-of-gravity adjustable support arm to rotate relative to the hinged mounting base (7) to adjust the center-of-gravity height of the fan installed at the end of the unit support arm (1). The end of the counterweight support arm (2) is provided with a counterweight water tank (3). The counterweight water tank (3) is provided with an electronic drain valve and a water inlet with a water pump for use in the operation of the counterweight water tank. The water capacity in the counterweight water tank (3) is controlled and adjusted; the lower part of the counterweight water tank (3) is provided with a counterweight support (5) for installation and fixing on the wind turbine base. The top surface of the counterweight support (5) is provided with a positioning groove for fixing the counterweight water tank (3) when the counterweight water tank (3) is placed in the positioning groove during the wind turbine's power generation operation. The surface of the positioning groove is provided with a buffer layer to prevent the counterweight water tank (3) from deforming. The angle between the unit support arm (1) and the counterweight support arm (2) is an obtuse angle. The drive mechanism (6) is a winch mechanism. The traction rope of the winch mechanism is connected to the counterweight support arm (2).

2. The assembly method for deep-sea floating wind turbines according to claim 1, characterized in that, In step S101, when the deep-sea floating wind turbine is assembled on shore separately at the dock assembly station, it means that the various subsystems of the deep-sea floating wind turbine are assembled in the order after pre-simulation optimization. The subsystem refers to the constituent unit of the deep-sea floating wind turbine, and the center-of-gravity adjustable support arm is a subsystem of the deep-sea floating wind turbine.

3. The assembly method for deep-sea floating wind turbines according to claim 2, characterized in that, The acquisition of the pre-optimized simulation sequence includes: S201, Different assembly schemes are determined for each subsystem of the deep-sea floating wind turbine, and the parallel assembly and front-to-back assembly methods of each subsystem are different under different assembly schemes. S202, calculate the assembly time cost for different assembly schemes; S203, select the assembly scheme with the minimum assembly time cost, and use the parallel assembly of each subsystem and the order of assembly as the obtained simulation optimization order.

4. The assembly method for deep-sea floating wind turbines according to claim 1, characterized in that, The counterweight support (5) is cylindrical, and the positioning groove is an arc-shaped groove.

5. The assembly method for deep-sea floating wind turbines according to claim 4, characterized in that, Both the unit support arm (1) and the counterweight support arm (2) are hollow structures, and the interior of the spatial structure is provided with annular reinforcing ribs.

6. The assembly method for deep-sea floating wind turbines according to claim 5, characterized in that, A reinforcing connecting rod (4) is also connected between the unit support arm (1) and the counterweight support arm (2), and the reinforcing connecting rod (4), the unit support arm (1) and the counterweight support arm (2) are arranged in a triangle.

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