Tension-leg floating foundation, construction method and wind turbine generator set

Abstract

A tension-leg floating foundation, comprising: a floating body (200), the floating body comprising a main column (210) and connectors (220) spaced apart from each other around the main column, the main column being configured to be connected to a wind turbine body, and one end of each connector being connected to a second end portion (210b) of the main column; and a plurality of tension assemblies (100) arranged spaced apart from each other around the floating body, each tension assembly comprising a tension leg (11) and a mooring connection portion (12), one side of each tension leg being universally connected to the connector, the other side thereof protruding from the connector toward the side where a first end is located, the mooring connection portion being arranged on the side of the tension leg protruding from the connector in an axial direction (X), and a mooring cable (300) being provided corresponding to each tension leg, wherein each tension leg is provided with a clearance cavity (115) runing therethrough in the axial direction, one end of the mooring cable is inserted into the clearance cavity and connected to the mooring connection portion, and the other end of the mooring cable is configured to be fixedly connected to the seabed. The tension-leg floating foundation can reduce the construction difficulty and construction cost of a wind turbine foundation. Further provided are a construction method and a wind turbine generator set.

Description

Tension leg floating foundation, construction method and wind turbine generator set

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application 202411978381.0, filed on December 30, 2024, entitled “Tension Leg Floating Foundation, Construction Method and Wind Turbine Generator,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of wind power technology, and in particular to a tension leg floating foundation, a construction method, and a wind turbine generator set. Background Technology

[0004] With the development of offshore wind power in recent years, shallow water resources are becoming increasingly scarce. As water depths increase to over 70 meters, the cost of traditional stationary offshore wind turbines has risen significantly, making them unable to meet the construction and cost requirements of offshore wind power projects. Floating wind turbines in deep waters will have a significant cost advantage over stationary turbines and represent an important direction for the future development of the wind power industry.

[0005] Floating wind turbine foundations, such as tension leg wind turbine foundations, have excellent motion performance and rely on tensioned tension legs to ensure stability during operation. Therefore, they are widely used in floating foundations.

[0006] However, tension leg wind turbine foundations in related technologies suffer from defects in the tension leg structure design, which make it difficult to tension mooring cables when used as wind turbine foundations, and they are also prone to fatigue damage, thus affecting their service life. Summary of the Invention

[0007] This application provides a tension leg floating foundation, a construction method, and a wind turbine generator. The tension leg floating foundation can reduce the difficulty of mooring cable tensioning and reduce the probability of fatigue damage to the mooring cable.

[0008] In one aspect, an embodiment of this application provides a tension leg floating foundation, comprising: a floating body, including a main column and connecting bodies spaced apart around the main column, the main column having a first end and a second end along its own axial direction, the first end being used to connect to a wind turbine body, and one end of each connecting body being connected to the second end; a tension assembly, multiple tension assemblies being spaced apart around the floating body, the tension assembly including tension legs and a mooring connection, in the axial direction, one side of the tension leg being universally connected to the connecting body and the other side protruding from the connecting body towards the side where the first end is located, the mooring connection being disposed on the side of the tension leg protruding from the connecting body in the axial direction; a mooring cable, a mooring cable being provided for each tension leg; wherein, the tension leg is provided with a relief cavity that extends through it in the axial direction, one end of the mooring cable is inserted into the relief cavity and connected to the mooring connection, and the other end of the mooring cable is used to connect and fix to the seabed.

[0009] According to one aspect of the embodiments of this application, the tension leg includes an inner wall, an outer wall, a top wall, and a bottom wall. The inner wall and the outer wall are spaced apart and coaxially arranged. An annular cavity is formed between the inner wall and the outer wall. The top wall and the bottom wall are arranged opposite each other along the axial direction and are respectively connected to the inner wall and the outer wall to close the annular cavity. The inner wall is hollow and has a relief cavity. The mooring connection portion protrudes at least partially from the top wall.

[0010] According to one aspect of the embodiments of this application, the mooring connection includes an adapter chain and a first tensioner. The adapter chain is disposed in the relief cavity, one end of the adapter chain is connected to the first tensioner, and the other end of the adapter chain is connected to the mooring cable.

[0011] According to one aspect of the embodiments of this application, the floating body further includes a first reinforcing body, and each connecting body is connected to the main column by the first reinforcing body.

[0012] According to one aspect of the embodiments of this application, the floating foundation further includes connecting struts, and each tension assembly is detachably connected to the floating body with a connecting strut.

[0013] According to one aspect of the embodiments of this application, the floating foundation further includes tension cables, and tension cables are detachably connected between two adjacent tension legs.

[0014] According to one aspect of the embodiments of this application, the tension assembly further includes a floating component and a driving component. The floating component includes two or more floating bodies distributed along the axial direction. Each floating body has a degree of freedom of movement relative to the tension leg along the axial direction and is detachably connected to the tension leg. The driving component is disposed on the tension leg and connected to the floating component. The driving component is capable of driving the floating body to move relative to the tension leg to a predetermined position.

[0015] According to one aspect of the embodiments of this application, a guide rail extending along the axial direction is provided on the tension leg, a movable block is provided on the floating body, a connector is detachably connected between two adjacent movable blocks, and the movable block is engaged with the guide rail and has a degree of freedom of movement relative to the guide rail along the axial direction.

[0016] The drive assembly includes a drive component and a traction component. The traction component is connected to the moving block. The drive component drives the traction component to move or retract the traction component, so that the floating body moves axially relative to the tension leg.

[0017] According to one aspect of the embodiments of this application, the drive assembly further includes a guide wheel disposed on one side of the tension leg in the axial direction, a drive member disposed on the side of the tension leg away from the guide wheel, and a traction member including a flexible cable. The flexible cable is disposed around the guide wheel, one end of the flexible cable is connected to one of the moving blocks, and the other end of the flexible cable is connected to the drive member. The drive member includes one of a second tensioner and a winch and is capable of retracting and extending the flexible cable.

[0018] On the other hand, according to an embodiment of this application, a construction method for a wind turbine foundation is proposed, including:

[0019] The system provides basic components, including a floating body and a tension assembly. The floating body includes a main column and connecting bodies spaced apart around the main column. The main column has a first end and a second end along its own axial direction. One end of each connecting body is connected to the second end. Multiple tension assemblies are spaced apart around the floating body. Each tension assembly includes a tension leg, a mooring connection, a floating component, and a drive assembly. In the axial direction, one side of the tension leg is universally connected to the connecting body, and the other side protrudes from the connecting body towards the side where the first end is located. The tension leg has a clearance cavity that runs through it in the axial direction. The mooring connection is located on the side of the tension leg that protrudes from the connecting body in the axial direction. The floating assembly includes two or more floating bodies distributed in the axial direction. Each floating body has a degree of freedom of movement relative to the tension leg in the axial direction and is detachably connected to the tension leg. The drive assembly is located on the tension leg and connected to the floating assembly. The drive assembly can drive the floating body in the axial direction relative to the tension leg.

[0020] The basic components are placed on the sea surface and towed to the predetermined sea area using a towing device;

[0021] Insert one end of the mooring cable into the relief cavity and connect it to the mooring connection part. Connect and fix the other end of the mooring cable to the seabed. Control the drive assembly to make the floating body move relative to the main column to separate from the tension leg.

[0022] According to another aspect of the embodiments of this application, in the step of providing the basic component, the basic component further includes connecting struts and tension cables, each tension assembly is detachably connected to the floating body with a connecting strut, and a tension cable is detachably connected between two adjacent tension legs;

[0023] After inserting one end of the mooring cable into the relief cavity and connecting it to the mooring connection, connecting and fixing the other end of the mooring cable to the seabed, and controlling the drive assembly to move the floating body relative to the main column to separate it from the tension leg, the method also includes removing the connecting strut and / or tension cable.

[0024] According to another aspect of the embodiments of this application, the steps of inserting one end of the mooring cable into the relief cavity and connecting it to the mooring connection part, connecting and fixing the other end of the mooring cable to the seabed, and controlling the drive assembly to move the floating body relative to the main column to separate it from the tension leg include:

[0025] Insert one end of the mooring cable into the relief cavity and connect it to the mooring connection part, and connect the other end of the mooring cable to the seabed, so that the mooring cable extends axially and is tensioned.

[0026] The control drive component releases the tension on the floating bodies, causing each floating body to move relative to the tension leg and separate from the tension leg under the action of buoyancy, while continuing to tension the mooring line.

[0027] According to another aspect of the embodiments of this application, prior to the step of towing the floating component to a predetermined sea area using a towing device, the method further includes:

[0028] The basic components were placed in seawater and temporarily secured.

[0029] The fan body is connected at the first end.

[0030] In another aspect, according to an embodiment of this application, a wind turbine generator set is provided, including: the aforementioned tension leg floating foundation; and a wind turbine body disposed on the tension leg floating foundation and connected to the first end.

[0031] According to the tension leg floating foundation, construction method, and wind turbine generator provided in the embodiments of this application, the tension leg floating foundation includes a floating body, a tension assembly, and a mooring cable. The first end of the main column of the floating body is used to connect and support the wind turbine foundation, and the tension legs of each tension assembly are connected to the second end of the main column through a connector. Since the tension assembly includes a tension leg and a mooring connection, in the axial direction, one side of the tension leg is universally connected to the connecting body, and the other side protrudes from the connecting body towards the first end. The mooring connection is located on the side of the tension leg that protrudes from the connecting body in the axial direction. At the same time, the tension leg is provided with a relief cavity that runs through it in the axial direction. One end of the mooring cable is inserted into the relief cavity and connected to the mooring connection, and the other end of the mooring cable is used to connect and fix it to the seabed. With this configuration, the mooring cable and the mooring connection can be connected and tensioned above the water surface. Due to the universal connection between the tension leg and the connecting body, the tension leg can rotate relative to the floating body during the tensioning process to adapt to the vertical tension of the mooring cable. The construction is simple and convenient, and the mooring cable does not need to bend, so there is no bending stress. The tensioning effect is good and the probability of fatigue damage caused by bending stress is reduced, which improves the reliability and service life of the tension leg floating foundation. Attached Figure Description

[0032] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0033] Figure 1 is a schematic diagram of the structure of a wind turbine generator set according to an embodiment of this application.

[0034] Figure 2 is a structural schematic diagram of a tension leg floating foundation according to an embodiment of this application;

[0035] Figure 3 is a partial enlarged view of a tension leg floating foundation according to an embodiment of this application;

[0036] Figure 4 is a structural schematic diagram of a tension leg floating foundation according to another embodiment of this application;

[0037] Figure 5 is a partial structural schematic diagram of a tension leg floating foundation according to an embodiment of this application;

[0038] Figure 6 is a cross-sectional view along the AA direction in Figure 5;

[0039] Figure 7 is a cross-sectional view along the BB direction in Figure 5;

[0040] Figure 8 is a magnified view of point C in Figure 7;

[0041] Figure 9 is a schematic diagram of the construction method of a wind turbine foundation according to an embodiment of this application;

[0042] Figures 10 to 13 are schematic diagrams of the construction method of a wind turbine foundation according to an embodiment of this application.

[0043] Markings: 1. Floating base; 100. Tension assembly; 11. Tension leg; 111. Top wall; 112. Bottom wall; 113. Inner wall; 114. Outer wall; 115. Clearance cavity; 12. Mooring connection; 121. First tensioner; 122. Adapter chain; 13. Guide rail; 14. Moving block; 16. First cable tube; 20. Floating assembly; 21. Floating body; 22. Connector; 30. Drive assembly; 31. Drive component; 32. Traction component; 33. Guide wheel; 40. Connecting strut; 50. Tension cable; 60. Universal joint; 200. Floating body; 210. Main column; 210a. First end; 210b. Second end; 220. Connector; 230. First reinforcement; 300. Mooring cable; 400, tower; 500, nacelle; 600, impeller; 610, hub; 620, blade; X, axial direction.

[0044] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0045] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0046] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the tension leg floating foundation, construction method, or wind turbine generator set of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] As shown in Figure 1, this embodiment of the application provides a wind turbine generator set, including a wind turbine foundation and a wind turbine body. The wind turbine body includes a tower 400, a nacelle 500, a generator, and a rotor 600. The tower 400 is connected to the wind turbine foundation, the nacelle 500 is disposed at the top of the tower 400, and the generator is disposed in the nacelle 500. In some examples, the generator may be located outside the nacelle 500; of course, in some examples, the generator may also be located inside the nacelle 500. The rotor 600 includes a hub 610 and multiple blades 620 connected to the hub 610. The rotor 600 is connected to the rotor of the generator through the hub 610, thereby driving the rotor to rotate relative to the stator, realizing the power generation needs of the wind turbine generator set. The wind turbine foundation floats in the seawater and is fixed to the seabed by a mooring cable 300 to restrict its movement.

[0048] With the development of offshore wind power in recent years, shallow water resources are becoming increasingly scarce. As water depths increase to over 70 meters, the cost of traditional stationary offshore wind turbines has risen significantly, making them unable to meet the construction and cost requirements of offshore wind power projects. Floating wind turbines in deep waters will have a significant cost advantage over stationary turbines and represent an important direction for the future development of the wind power industry.

[0049] Tension leg wind turbine foundations have excellent motion performance and rely on tensioned tension legs to ensure stability during operation, making them widely used in wind turbine foundations.

[0050] However, due to structural design flaws in the tension leg type wind turbine foundation, the connection and tensioning of mooring cables usually require multiple reversing wheels to guide them to the side where the floating body is located. This makes it difficult to connect and tension the mooring cables during construction, and also makes the foundation prone to fatigue damage that affects its lifespan.

[0051] Based on this, one embodiment of this application provides a new tension leg floating foundation, which can reduce the difficulty and cost of wind turbine foundation construction.

[0052] As shown in Figures 1 to 4, an embodiment of this application provides a tension leg floating foundation, including a floating body 200, tension assemblies 100, and mooring cables 300. The floating body 200 includes a main column 210 and connecting bodies 220 spaced around the main column 210. The main column 210 has a first end 210a and a second end 210b along its own axial direction X. The first end 210a is used to connect to the main body of the wind turbine, and one end of each connecting body 220 is connected to the second end 210b. Multiple tension assemblies 100 are spaced around the floating body 200. Each tension assembly 100 includes tension legs 11 and mooring connection parts 12. In the axial direction X, one side of the tension leg 11 is universally connected to the connecting body 220, and the other side protrudes from the connecting body 220 towards the side where the first end 210a is located. The mooring connection part 12 is located on the side of the tension leg 11 that protrudes from the connecting body 220 in the axial direction X. A mooring cable 300 is provided for each tension leg 11. The tension leg 11 is provided with a relief cavity 115 that extends through the axial direction X. One end of the mooring cable 300 is inserted into the relief cavity 115 and connected to the mooring connection part 12. The other end of the mooring cable 300 is used to connect and fix it to the seabed.

[0053] The main column 210 can be a circular, elliptical, or polygonal column structure. The main column 210 can have a cavity inside, which helps to ensure the buoyancy requirements of the floating foundation 1.

[0054] The main column 210 has a first end face and a second end face along its own axial direction X. The first end face is used to support the tower 400. The first end face 210a can be understood as extending a predetermined length along the axial direction X from the first end face. For example, the area extending along the axial direction X from the first end face, accounting for one-third of the total height of the main column 210, can be understood as the first end face 210a. The second end face is in contact with seawater. The second end face 210b can be understood as extending a predetermined length along the axial direction X from the second end face. For example, the area extending along the axial direction X from the second end face, accounting for one-third of the total height of the main column 210, can be understood as the second end face 210b.

[0055] The connector 220 can be rod-shaped or box-shaped. Optionally, the connector 220 may have an internal cavity to ensure the buoyancy requirements of the floating foundation 1.

[0056] The connectors 220 can be spaced out and evenly distributed around the main column 210.

[0057] Along the axial direction X, the height of the main column 210 is higher than the height of the connector 220, and the main column 210 protrudes from the connector 220 along the axial direction X.

[0058] The number of tension assemblies 100 can be three, four or more. Each tension assembly 100 is connected to the main column 210 by a connector 220.

[0059] The tension leg 11 of the tension assembly 100 can be connected to the connecting body 220 through a universal joint 60, ball joint, or other connecting structures, so that the tension assembly 100 has a certain degree of freedom of movement relative to the floating body 200.

[0060] The mooring connection part 12 is used to connect with the mooring cable 300 and can have the functions of connecting with the mooring cable 300 and tensioning, for example, a hydraulic tensioner or a mechanical winch-type tensioning device can be used.

[0061] One embodiment of this application provides a tension leg floating foundation. When operating in a designated sea area, one end of the mooring cable 300 can be inserted into the relief cavity 115 and connected to the mooring connection part 12. The other end of the mooring cable 300 is used for connection and fixation to the seabed. The tension of the mooring cable 300 can be adjusted by a tensioning component or other external tensioning component correspondingly provided on the mooring connection part 12. Since the tension assembly 100 includes a tension leg 11 and a mooring connection part 12, in the axial direction X, one side of the tension leg 11 is universally connected to the connecting body 220, and the other side protrudes from the connecting body 220 towards the side where the first end 210a is located. The mooring connection part 12 is provided on the side of the tension leg 11 that protrudes from the connecting body 220 in the axial direction X. At the same time, the tension leg 11 is provided with a relief cavity 115 that extends through in the axial direction X. One end of the mooring cable 300 is inserted into the relief cavity 115 and connected to the mooring connection part 12, and the other end of the mooring cable 300 is used for connection and fixation to the seabed. By connecting and fixing it to the seabed, the mooring cable 300 and the mooring connection 12 can be connected and tensioned above the water surface. Due to the universal connection between the tension leg 11 and the connecting body 220, the tension leg 11 can rotate relative to the floating body 200 during the tensioning process to adapt to the vertical tension of the mooring cable 300. The construction is simple and convenient, and the mooring cable 300 does not need to turn or bear bending moment. The tensioning effect is good and the probability of fatigue damage caused by bending moment is reduced, thereby improving the reliability and service life of the tension leg floating foundation.

[0062] As shown in Figures 2 to 8, in some optional embodiments, one embodiment of this application provides a tension leg floating foundation, wherein the tension leg 11 includes an inner wall 113, an outer wall 114, a top wall 111, and a bottom wall 112. The inner wall 113 and the outer wall 114 are spaced apart and coaxially arranged, and an annular cavity is formed between the inner wall 113 and the outer wall 114. The top wall 111 and the bottom wall 112 are arranged opposite each other along the axial direction X and are respectively connected to the inner wall 113 and the outer wall 114 to close the annular cavity. The inner wall 113 is hollow and has a relief cavity 115. The mooring connection part 12 is at least partially protruding from the top wall 111.

[0063] The inner wall 113 and outer wall 114 may be cylindrical structures, while the top wall 111 and bottom wall 112 may be annular plate structures. The mooring connection 12 may be connected to the top wall 111, and its orthogonal projection in the axial direction X may be at least partially located within the clearance cavity 115 hollowed out in the inner wall 113.

[0064] One embodiment of this application provides a tension leg floating foundation. Through the above-described configuration, when the mooring cable 300 connects to and tensions the tension assembly 100, the tension force acts on the center position of the tension assembly 100, which facilitates adjustment and tensioning, ensures uniform force distribution, and improves the stability of the tension leg floating foundation.

[0065] In some alternative embodiments, one embodiment of this application provides a tension leg floating foundation, wherein the mooring connection 12 includes an adapter chain 122 and a first tensioner 121. The adapter chain 122 is disposed in the relief cavity 115, one end of the adapter chain 122 is connected to the first tensioner 121, and the other end of the adapter chain 122 is connected to the mooring cable 300.

[0066] The first tensioner can be a hydraulic tensioner, which provides precise and controllable tension through a hydraulic system to adjust the tension of the mooring cable. Of course, in some embodiments, the first tensioner can also be a mechanical winch-type tensioning device, in which the winch tightens the mooring cable by rotating, and a braking device can fix the position of the winch, thereby maintaining the tension of the mooring cable.

[0067] The above setup ensures the connection requirements with the mooring cable 300, and allows the operator to directly align the mooring cable 300 above the sea surface when tensioning it after the mooring cable 300 is connected to the adapter chain 122, ensuring force balance and preventing bending damage to the mooring cable 300.

[0068] In some alternative embodiments, the tension leg floating foundation provided in one embodiment of this application further includes a first reinforcing body 230 in the floating body 200, and each connecting body 220 is connected to the main column 210 by the first reinforcing body 230.

[0069] One embodiment of this application provides a tension leg floating foundation, which, by setting a first reinforcing body 230, can ensure the connection strength between the connecting body 220 and the main column 210, ensure the integrity and stability of the floating body 200, and improve its load-bearing capacity.

[0070] Optionally, the first reinforcing body 230 includes a reinforcing rod structure, which may be inclined. One end of the first reinforcing body 230 is connected to the main column 210, and the other end can be connected to the connecting body 220. Through the above arrangement, the overall strength of the floating body 200 can be improved by utilizing triangular stability.

[0071] Please refer to Figure 4. In some optional embodiments, one embodiment of this application provides a tension leg type floating base. The floating base 1 further includes connecting struts 40. Each tension assembly 100 is detachably connected to the floating body 200 by a connecting strut 40.

[0072] The connecting strut 40 can be detachably connected to the tension assembly 100 and the floating body 200.

[0073] Because the tension leg floating foundation needs to be towed to a designated area and connected to the mooring cable 300 during construction, and in some embodiments, heavy components such as the tower 400, engine room 500, and impeller 600 are also installed on top of the tension leg floating foundation during towing. By making each tension assembly 100 detachably connected to the floating body 200 with a connecting strut 40, the tension assembly 100 and the floating body 200 can be connected into a whole, avoiding the risk of swaying during towing caused by the movement of the tension assembly 100 relative to the floating body 200.

[0074] Optionally, when the floating body 200 includes the first reinforcing body 230, one end of the connecting strut 40 can be connected to the first reinforcing body 230 and the other end can be connected to the tension leg 11 of the tensioning assembly, so as to ensure that the relative position of the floating body 200 and the tensioning assembly is fixed.

[0075] Optionally, once the floating foundation 1 has been towed to the designated sea area and secured to the mooring cable 300, the connecting strut 40 can be removed.

[0076] Please refer to Figure 4. In some optional embodiments, one embodiment of this application provides a tension leg floating foundation. The floating foundation 1 further includes tension cables 50, and the tension cables 50 are detachably connected between two adjacent tension legs 11. With the above arrangement, the tension cables 50 can be used to connect the tension legs 11, ensuring the stability of their relative position with the floating foundation 1 during towing at sea.

[0077] Please continue to refer to Figures 4 to 8. In some optional embodiments, one embodiment of this application provides a tension leg type floating foundation. The tension assembly 100 further includes a floating component 20 and a driving component 30. The floating component 20 includes two or more floating bodies 21 distributed along the axial direction X. Each floating body 21 has a degree of freedom of movement relative to the tension leg 11 along the axial direction X and is detachably connected to the tension leg 11. The driving component 30 is disposed on the tension leg 11 and connected to the floating component 20. The driving component 30 can drive the floating body 21 to move relative to the tension leg 11 to a predetermined position.

[0078] The floating assembly 20 may include a plurality of floats 21, which may include air bladders or hollow metal cavities. The plurality of floats 21 may be distributed at least partially along the axial direction X of the main column 210. In some embodiments, the plurality of floats 21 may also be distributed circumferentially around the tension leg 11.

[0079] Each float 21 can be movably connected to the tension leg 11 along the axial direction X, so that the float 21 has a degree of freedom of movement relative to the tension leg 11. The float 21 and the tension leg 11 can be detachably connected to each other by driving the float 21 to move along the axial direction X to the end of the tension leg 11 and separating from the tension leg 11.

[0080] The drive assembly 30 may include a winch drive, a tensioning chain stopper drive, a telescopic cylinder drive, etc.

[0081] One embodiment of this application provides a tension leg floating foundation. Through the aforementioned configuration, when the tension leg floating foundation is moved from an area such as a dock to a predetermined area of ​​wind turbine generator sets, the floating assembly 20 provides buoyancy to the floating body 200 and its supporting structures and tension assembly 100, enabling it to float on the sea surface and be stably towed. Before or during towing, the driving assembly 30 can drive the floating body 21 of the floating assembly 20 to move downwards or upwards relative to the tension leg to a suitable position, ensuring buoyancy requirements are met. Once towed to the predetermined sea area and the mooring connection 12 is connected and tensioned to the mooring cable 300, the driving assembly 30 is controlled to release the floating body 21, causing it to move relative to the tension leg 11 to its end and separate under the action of buoyancy.

[0082] In some alternative embodiments, one embodiment of this application provides a tension leg type floating base, wherein the tension leg 11 is provided with a guide rail 13 extending along the axial direction X, the floating body 21 is provided with a movable block 14, and a connector 22 is detachably connected between two adjacent movable blocks 14. The movable block 14 is engaged with the guide rail 13 and has a degree of freedom of movement relative to the guide rail 13 along the axial direction X. The driving component 30 includes a driving component 31 and a traction component 32. The traction component 32 is connected to the movable block 14. The driving component 31 drives the traction component 32 to move or retract the traction component 32 so that the floating body 21 moves relative to the tension leg 11 along the axial direction X.

[0083] The connector 22 may include a connecting rod, a connecting cable, etc., and optionally includes a connecting cable, which may include a wire rope, cable, etc.

[0084] The connector 22 can be directly or indirectly connected to the floating body 21.

[0085] The tension leg floating foundation provided in one embodiment of this application, through the above-described configuration, can synchronously drive each floating body 21 that is relatively arranged and connected in the axial X direction to move synchronously using the same drive component 30. This facilitates the fixing and disassembly of the position of each floating body 21 on the tension leg 11, reduces the number of drive components 30 used, and lowers costs.

[0086] The tension leg 11 can be provided with one or more guide rails 13. When there are multiple guide rails 13, they are distributed at intervals in the circumferential direction of the tension leg 11.

[0087] Each guide rail 13 can be equipped with two or more floats 21. Each float 21 is equipped with a moving block 14, which is snapped into and slidably connected to the guide rail 13. Optionally, a connector 22 can be detachably connected between two adjacent floats 21 on the same guide rail 13.

[0088] Optionally, when there are two or more guide rails 13, each floating body 21 located on the same guide rail 13 is grouped together and connected to one of the drive components 30.

[0089] One embodiment of this application provides a tension leg type floating base, in which a guide rail 13 extending along the axial direction X is provided on the tension leg 11, and a movable block 14 is provided on the floating body 21. The movable block 14 is engaged with the guide rail 13 and has a degree of freedom of movement relative to the guide rail 13 along the axial direction X. This facilitates the realization of the movable connection requirement between the floating body 21 and the movable block 14. Furthermore, the engagement of the movable block 14 with the guide rail 13 can restrict the movable block 14 from separating from the guide rail 13 in the radial direction of the tension leg 11, ensuring the reliability of the connection.

[0090] As shown in Figure 8, in some optional embodiments, the guide rail 13 is a T-shaped guide rail, and the moving block 14 is provided with a T-shaped groove that matches the shape of the T-shaped guide rail. With the above arrangement, it can be ensured that the moving block 14 drives the float 21 to move relative to the tension leg 11 along the axial direction X, while effectively restricting the moving block 14 from separating from the guide rail 13 in the radial direction of the tension leg 11.

[0091] The drive component 31 includes at least one of a drive motor, a telescopic cylinder, a winch, and a tensioning chain stopper.

[0092] The traction component 32 includes structures such as flexible cables and rigid rods.

[0093] When the driving component 31 includes structures such as a winch and a tensioning chain stopper, the traction component 32 can include a flexible cable. The traction component 32 can be directly or indirectly connected to the floating body 21. By winding and releasing the traction component 32, the floating body 21 can be moved on the tension leg 11. Of course, when the traction component 32 includes structures such as a rigid rod, the driving component 31 can include structures such as a telescopic cylinder. The traction component 32 is connected between the telescopic rod and the floating body 21. By controlling the extension or retraction of the telescopic cylinder, the traction component 32 drives the floating body 21 to move relative to the guide rail 13, which can also satisfy the driving of the floating body 21, so that it moves to a suitable position relative to the tension leg 11 along the axial direction X.

[0094] The tension leg floating foundation provided in one embodiment of this application, through the above-described configuration, facilitates the driving requirements of the floating body 21. During the installation of the floating body 21, the driving component 31 drives the traction component 32 to move the floating body 21 down along the tension leg 11 and install it in place, and keep it fixed in the position of the tension leg 11. When the wind turbine foundation where the tension assembly 100 is located is installed in place, and it is necessary to disassemble the floating body 21, it is only necessary to release the traction component 32 through the driving component 31 or push the traction component 32 to move it, so that the floating body floats up. The floating body 21 can be fixed and separated relative to the tension leg 11 by operating tools or workers, and the floating body 21 can be removed. The operation is simple, reducing the construction difficulty and construction cost of the wind turbine foundation where the tension leg 11 assembly is located.

[0095] In some alternative embodiments, the tension leg floating foundation provided in one embodiment of this application further includes a drive assembly 30 that includes a guide wheel 33 disposed on the tension leg 11 on the axial X side, a drive member 31 disposed on the side of the tension leg 11 away from the guide wheel 33, and a traction member 32 that includes a flexible cable that surrounds the guide wheel 33. One end of the flexible cable is connected to one of the moving blocks 14, and the other end of the flexible cable is connected to the drive member 31. The drive member 31 includes one of a second tensioner and a winch and is capable of retracting and extending the flexible cable.

[0096] The guide wheel 33 is rotatably connected to the tension leg 11, and an ear seat can be provided on the outer periphery of the tension leg 11, with the guide wheel 33 rotating on the ear seat. When used in a wind turbine generator set, one side of the tension leg 11 can protrude from the seawater, the guide wheel 33 can be provided on the other side of the tension leg 11 in the axial direction X, and the drive component 31 can be provided on the part of the tension leg 11 that protrudes from the sea surface.

[0097] Flexible cables can include ropes, wire ropes, etc.

[0098] The guide wheel 33 is used to realize the reversal function of the flexible cable in the axial direction X, so that both ends of the flexible cable in its own length direction are located on the same side of the guide wheel 33 in the axial direction X.

[0099] The flexible cable can be connected to the movable block 14 set on the floating body 21.

[0100] One embodiment of this application provides a tension leg floating foundation. Through the aforementioned configuration, the drive component 31 is connected to the other end of the flexible cable, and the flexible cable can be wound and released by means of coiling, enabling the rapid installation and disassembly of the float 21 on the tension leg 11. Furthermore, the arrangement of the guide wheel 33 and its relation to the drive component 31 allows the drive component 31 to remain above the sea surface during construction. Operators only need to control the drive component 31 above the sea surface to tighten or release the flexible cable to install or disassemble the float 21 on the tension leg 11, reducing construction difficulty and cost, improving construction efficiency, and ensuring the safety of operators.

[0101] In some alternative embodiments, one embodiment of this application provides a tension leg floating base, in which a first cable tube 16 is provided inside the tension leg 11 along the axial direction X. One end of the first cable tube 16 penetrates the top wall 111 of the tension leg 11, and a flexible cable passes through the first cable tube 16 and is connected to the drive member 31.

[0102] The number of first cable tubes 16 provided on the tension leg 11 can be one, two or more, which can be determined according to the number of guide rails 13 and drive components 31. Optionally, the number of first cable tubes 16 can be equal to the number of guide rails 13 and drive components 31.

[0103] The first cable conduit 16 can be a U-shaped tube closed on one side in the axial direction X. The U-shaped opening can be set towards the side wall of the tension leg 11 and sealed. The first cable conduit 16 and the tension leg 11 can be sealed and fixed by welding or other methods. The top wall 111 and the outer wall 114 can be provided with first clearance holes that communicate with the first cable conduit 16. The first cable conduit 16 is inserted into the two first clearance holes to form a channel, which is separated from the cavity of the tension leg 11.

[0104] One embodiment of this application provides a tension leg floating foundation. Through the aforementioned configuration, the flexible cable is protected by the first cable tube 16. Simultaneously, the first cable tube 16 facilitates the reversal of the flexible cable, ensuring that the drive unit 31 is positioned away from the guide wheel 33, which is beneficial for operators at sea. Furthermore, the first cable tube 16 isolates the location of the flexible cable from other areas within the cavity of the tension leg 11, effectively preventing seawater from entering the cavity of the tension leg 11 and ensuring the buoyancy requirements of the tension leg 11 at sea.

[0105] In some optional embodiments, each tension assembly 100 of the tension leg floating foundation provided in one embodiment of this application includes multiple floating components 20, which are distributed at intervals in the circumferential direction of the tension leg 11, and each floating component 20 is provided with a corresponding drive component 30.

[0106] The number of floating components 20 can be two, three, or more.

[0107] Each floating component 20 is provided with a corresponding driving component 30. Each floating component 20 includes two or more floating bodies 21, and a connecting member 22 connects adjacent floating bodies 21 of the same floating component 20. Each driving component 30 includes a driving member 31 and a traction member 32. The traction member 32 includes a flexible cable, and each driving component 30 includes a guide wheel 33. The corresponding floating components 20, driving components 30, and guide wheels 33 are configured in the same way as in the above-described embodiment, and will not be repeated here.

[0108] The tension leg floating foundation provided in one embodiment of this application, through the above-mentioned configuration, can ensure that the buoyancy force on the tension assembly 100 is uniform around it, thus ensuring stable operation.

[0109] In some alternative embodiments, the float 21 includes an air bladder having a cavity, and the air bladder includes either a rubber wall or a metal wall. The air bladder may have a cylindrical outline and hemispherical ends in the axial direction X. Of course, in some embodiments, the air bladder may also have a spherical or ellipsoidal outline.

[0110] As shown in Figures 9 to 12, and in conjunction with Figures 1 to 8, in another embodiment of this application, a construction method for a wind turbine foundation is also provided, which can be used to construct the tension leg floating foundation provided in the above embodiments. The construction method includes:

[0111] S100. Provide basic components, including a floating body 200 and tension assemblies 100. The floating body 200 includes a main column 210 and connecting bodies 220 spaced around the main column 210. The main column 210 has a first end 210a and a second end 210b along its own axial direction X. One end of each connecting body 220 is connected to the second end 210b. Multiple tension assemblies 100 are spaced around the floating body 200. The tension assembly 100 includes a tension leg 11, a mooring connection 12, a floating component 20, and a drive assembly 30. In the axial direction X, one side of the tension leg 11 is connected to the connecting body. The 220 universal joint is provided with a connecting body 220 protruding from the side where the first end 210a is located. The tension leg 11 is provided with a relief cavity 115 that runs through the tension leg 11 along the axial direction X. The mooring connection part 12 is provided on the side of the tension leg 11 that protrudes from the connecting body 220 along the axial direction X. The floating assembly 20 includes two or more floating bodies 21 distributed along the axial direction X. Each floating body 21 has a degree of freedom of movement relative to the tension leg 11 along the axial direction X and is detachably connected to the tension leg 11. The drive assembly 30 is provided on the tension leg 11 and connected to the floating assembly 20. The drive assembly 30 can drive the floating body 21 relative to the tension leg 11 along the axial direction X.

[0112] S200. Place the basic components on the sea surface and tow them to the designated sea area using a towing device. Optionally, the towing device can be a ship or other maritime navigation structure.

[0113] S300, insert one end of the mooring cable 300 into the relief cavity 115 and connect it to the mooring connection part 12, connect and fix the other end of the mooring cable 300 to the seabed, and control the drive assembly 30 to make the floating body 21 move relative to the main column 210 to separate from the tension leg 11.

[0114] The construction method provided in one embodiment of this application, through the above-described configuration, allows the floating foundation to provide stable buoyancy to the towing of the foundation components during construction, ensuring the stability of the towing. Simultaneously, after connecting the mooring cable in a predetermined area, the mooring cable 300 and the mooring connection 12 can be connected and tensioned above the water surface. Due to the universal joint connection between the tension leg 11 and the connecting body 220, the tension leg 11 can rotate relative to the floating body 200 during tensioning to accommodate the vertical tension of the mooring cable 300. Construction is simple and convenient, and the mooring cable 300 does not need to turn, does not bear bending moment, has good tensioning effect, and reduces the probability of fatigue damage caused by bending moment, thereby improving the reliability and service life of the tension leg type floating foundation.

[0115] Please refer to Figures 9 to 13. In some optional embodiments, the construction method provided in one embodiment of this application includes, in step S100, a connecting strut 40 and a tension cable 50 as the basic components. Each tension assembly 100 is detachably connected to the floating body 200 by a connecting strut 40, and a tension cable 50 is detachably connected between two adjacent tension legs 11. After step S200, the construction method further includes removing the connecting strut 40 and / or the tension cable 50. Either the connecting strut 40 or the tension cable 50 can be removed, or both can be removed. Optionally, the connecting strut 40 and / or the tension cable 50 can be removed before step S300, so that the tension leg 11 can have rotational freedom relative to the connecting body 220 during the process of connecting and tensioning with the mooring cable 300.

[0116] In some optional embodiments, one embodiment of the present application provides a construction method, step S300 of which includes:

[0117] S301. Insert one end of the mooring cable 300 into the relief cavity 115 and connect it to the mooring connection part 12, and connect the other end of the mooring cable 300 to the seabed, so that the mooring cable 300 extends along the axial direction X and is tensioned.

[0118] S302, the control drive assembly 30 releases the tension on the floating body 21, so that each floating body 21 moves relative to the tension leg 11 and separates from the tension leg 11 under the action of buoyancy, and continues to tension the mooring cable 300.

[0119] In step S301, the mooring connection 12 may include an adapter chain 122 and a first tensioner 121. The adapter chain 122 is disposed in the relief cavity 115. One end of the adapter chain 122 is connected to the first tensioner 121, allowing the mooring cable 300 to be connected to the adapter chain 122 of the mooring connection 12. The other end of the mooring cable 300 can be fixed to the seabed by means of anchoring structures, piling, etc. By controlling the first tensioner 121 to tighten or release the adapter connection, the mooring cable 300 can be tightened or released.

[0120] Optionally, the tension leg 11 is provided with a guide rail 13 extending along the axial direction X, and the float 21 is provided with a moving block 14. A connecting member 22 is detachably connected between two adjacent moving blocks 14. The moving block 14 is engaged with the guide rail 13 and has a degree of freedom of movement relative to the guide rail 13 along the axial direction X. The drive assembly 30 includes a drive member 31 and a traction member 32. The traction member 32 is connected to the moving block 14. The drive member 31 drives the traction member 32 to retract and extend the traction member 32 so that the float 21 moves relative to the tension leg 11 along the axial direction X.

[0121] In step S302, the floating body 21 can be moved along the axial direction X and separated from the tension leg 11 under the action of buoyancy by releasing the flexible cable. The mooring cable 300 can be tensioned simultaneously during the disassembly of the floating body 21.

[0122] Optionally, in step S302, the floating components 20 in the multiple tension assemblies 100 can be disassembled simultaneously to ensure the stability of the floating base 1 and prevent it from tipping over.

[0123] In some optional embodiments, one embodiment of the construction method provided in this application further includes placing the foundation components in seawater and temporarily fixing them;

[0124] The fan body is connected at the first end 210a.

[0125] With the above settings, during the process of transporting the basic components to the designated sea area in the sea, due to the setting of the floating component 20 and its relationship with the tension leg 11, the wind turbine body can be moved smoothly to the designated sea area, avoiding the need for offshore hoisting and assembly of heavy components such as the tower 400, nacelle 500 and impeller 600, thus improving assembly efficiency.

[0126] Optionally, after the fan body is placed, the floating body 21 can be driven to move along the axial direction X by the drive component. Floating bodies 21 can also be added to the tension leg as needed. The newly added floating bodies 21 are connected to the floating body 21 at the top of the tension leg 11. The drive component pulls each floating body 21 downwards, thereby adding floating bodies 21 and adjusting buoyancy.

[0127] One embodiment of this application provides a tension leg floating foundation and its construction method, which involves transforming the mooring connection point into a vertical boom and adding a detachable floating body 21 to the boom. This increases the platform's towing waterline and improves its self-stability, enabling independent floating and sinking on the water surface and eliminating reliance on large crane vessels or semi-submersible vessels. Simultaneously, a mooring cable 300 tensioning device is installed at the top of the vertical boom, working in conjunction with the floating body 21 to tension the mooring cable 300 on the water surface, reducing the difficulty of tensioning the mooring system.

[0128] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tension leg floating base, comprising: The floating body (200) includes a main column (210) and connecting bodies (220) spaced apart around the main column (210). The main column (210) has a first end (210a) and a second end (210b) along its own axial direction (X). The first end (210a) is used to connect with the fan body, and one end of each of the connecting bodies (220) is connected to the second end (210b). Tension assembly (100), a plurality of tension assemblies (100) are spaced apart around the floating body (200), each tension assembly (100) includes a tension leg (11) and a mooring connection (12), in the axial direction (X), one side of the tension leg (11) is universally connected to the connector (220) and the other side protrudes from the connector (220) toward the side where the first end (210a) is located, the mooring connection (12) is provided on the side of the tension leg (11) that protrudes from the connector (220) in the axial direction (X); Mooring cable (300), each of the tension legs (11) is provided with a mooring cable (300); The tension leg (11) is provided with a relief cavity (115) that extends through the axial direction (X). One end of the mooring cable (300) is inserted into the relief cavity (115) and connected to the mooring connection part (12). The other end of the mooring cable (300) is used to connect and fix to the seabed.

2. The tension leg type floating foundation according to claim 1, wherein, The tension leg (11) includes an inner wall (113), an outer wall (114), a top wall (111), and a bottom wall (112). The inner wall (113) and the outer wall (114) are spaced apart and coaxially arranged. An annular cavity is formed between the inner wall (113) and the outer wall (114). The top wall (111) and the bottom wall (112) are arranged opposite to each other along the axial direction (X) and are respectively connected to the inner wall (113) and the outer wall (114) to close the annular cavity. The inner wall (113) is hollow and has the relief cavity (115). The mooring connection part (12) protrudes at least partially from the top wall (111).

3. The tension leg floating foundation according to claim 1, wherein, The mooring connection (12) includes an adapter chain (122) and a first tensioner (121). The adapter chain (122) is disposed in the relief cavity (115). One end of the adapter chain (122) is connected to the first tensioner (121), and the other end of the adapter chain (122) is connected to the mooring cable (300).

4. The tension leg floating foundation according to claim 1, wherein, The floating body (200) also includes a first reinforcing body (230), and each of the connecting bodies (220) is connected to the main column (210) by the first reinforcing body (230).

5. The tension leg floating foundation according to claim 1, wherein, The floating base (1) also includes connecting struts (40), and each tension assembly (100) is detachably connected to the floating body (200) by the connecting struts (40); And / or, the floating foundation (1) further includes tension cables (50), which are detachably connected between adjacent tension legs (11).

6. The tension leg floating foundation according to any one of claims 1 to 5, wherein, The tension assembly (100) further includes a floating component (20) and a driving component (30). The floating component (20) includes two or more floating bodies (21) distributed along the axial direction (X). Each floating body (21) has a degree of freedom of movement relative to the tension leg (11) along the axial direction (X) and is detachably connected to the tension leg (11). The driving component (30) is disposed on the tension leg (11) and connected to the floating component (20). The driving component (30) is capable of driving the floating body (21) to move relative to the tension leg (11) to a predetermined position.

7. The tension leg floating foundation according to claim 6, wherein, The tension leg (11) is provided with a guide rail (13) extending along the axial direction (X), the floating body (21) is provided with a moving block (14), and a connector (22) is detachably connected between two adjacent moving blocks (14). The moving block (14) is engaged with the guide rail (13) and has a degree of freedom of movement relative to the guide rail (13) along the axial direction (X). The drive assembly (30) includes a drive member (31) and a traction member (32). The traction member (32) is connected to the moving block (14). The drive member (31) drives the traction member (32) to move or retract the traction member (32) so that the floating body (21) moves relative to the tension leg (11) along the axis (X).

8. The tension leg floating foundation according to claim 7, wherein, The drive assembly (30) further includes a guide wheel (33) disposed on the tension leg (11) on the axial (X) side, the drive member (31) is disposed on the side of the tension leg (11) away from the guide wheel (33), the traction member (32) includes a flexible cable, the flexible cable is disposed around the guide wheel (33), one end of the flexible cable is connected to one of the moving blocks (14), the other end of the flexible cable is connected to the drive member (31), the drive member (31) includes one of a second tensioner and a winch and is capable of retracting the flexible cable.

9. A construction method for a wind turbine foundation, comprising: A basic component is provided, comprising a floating body (200) and a tension assembly (100). The floating body (200) includes a main column (210) and connecting bodies (220) spaced around the main column (210). The main column (210) has a first end (210a) and a second end (210b) along its own axial direction (X). One end of each connecting body (220) is connected to the second end (210b). A plurality of tension assemblies (100) are spaced around the floating body (200). Each tension assembly (100) includes a tension leg (11), a mooring connection (12), a floating component (20), and a drive assembly (30). Along the axial direction (X), one side of the tension leg (11) is universally connected to the connecting body (220), and the other side is connected to the first end (210a) and the second end (210b). The connector (220) is provided with one end (210a) protruding from the side of the connector (220). The tension leg (11) is provided with a relief cavity (115) that runs through the axis (X). The mooring connection (12) is provided on the side of the tension leg (11) that protrudes from the connector (220) in the axis (X). The floating assembly (20) includes two or more floating bodies (21) distributed along the axis (X). Each floating body (21) has a degree of freedom of movement relative to the tension leg (11) along the axis (X) and is detachably connected to the tension leg (11). The drive assembly (30) is provided on the tension leg (11) and connected to the floating assembly (20). The drive assembly (30) can drive the floating body (21) to move relative to the tension leg (11) along the axis (X) to a predetermined position. The basic components are placed on the sea surface and towed to the predetermined sea area using a towing device; One end of the mooring cable (300) is inserted into the relief cavity (115) and connected to the mooring connection part (12). The other end of the mooring cable (300) is connected and fixed to the seabed. The drive assembly (30) is controlled to make the floating body (21) move relative to the main column (210) to separate from the tension leg (11).

10. The construction method according to claim 9, wherein, In the step of providing the basic component, the basic component further includes a connecting strut (40) and a tension cable (50), each tension assembly (100) is detachably connected to the floating body (200) with the connecting strut (40), and the tension cable (50) is detachably connected between two adjacent tension legs (11); After the steps of placing the basic component on the sea surface and towing the basic component to a predetermined sea area using a towing device, the method further includes removing the connecting strut (40) and / or tension cable (50).

11. The construction method according to claim 9, wherein, The steps of inserting one end of the mooring cable (300) into the relief cavity (115) and connecting it to the mooring connection part (12), connecting and fixing the other end of the mooring cable (300) to the seabed, and controlling the drive assembly (30) to move the floating body (21) relative to the main column (210) to separate it from the tension leg (11) include: One end of the mooring cable (300) is inserted into the relief cavity (115) and connected to the mooring connection part (12), and the other end of the mooring cable (300) is connected to the seabed, so that the mooring cable (300) extends along the axis (X) and is tensioned. The drive assembly (30) is controlled to release the tension on the floating body (21), so that each floating body (21) moves relative to the tension leg (11) and separates from the tension leg (11) under the action of buoyancy, and continues to tension the mooring cable (300).

12. The construction method according to claim 9, wherein, Prior to the step of towing the floating component (20) to a predetermined sea area using a towing device, the method further includes: The basic components were placed in seawater and temporarily secured. The fan body is connected to the first end (210a).

13. A wind turbine generator set, wherein, include: Tension leg floating base as described in any one of claims 1 to 8; The main body of the fan is mounted on the tension leg floating foundation and connected to the first end (210a).

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