Offshore wind turbine generator foundation with steel-concrete composite structure

Abstract

The offshore wind turbine generator foundation of the steel-concrete composite structure comprises a bottom foundation, a middle foundation and an upper end foundation which are sequentially arranged from bottom to top, the bottom foundation and the middle foundation are each of a hollow structure, and an inner cavity partition plate is assembled in an inner cavity of the bottom foundation in a guiding and moving mode; the lower end of the middle foundation is movably assembled in an inner cavity of the bottom foundation in a guiding mode, the inner cavity of the bottom foundation is divided into a lower side cavity and an upper side cavity communicated with the inner cavity of the middle foundation by the inner cavity partition plate, a bottom foundation channel communicated with the lower side cavity is formed in the lower end of the bottom foundation, and a channel valve is arranged on the bottom foundation channel. A middle foundation balancing weight is arranged at the upper end of the middle foundation, the lower end of the upper-end foundation is assembled in an inner cavity of the middle foundation in a guiding and moving mode, and a plurality of upper-end foundation cavities arranged at intervals in the vertical direction are formed in the upper-end foundation. The technical problem that in the prior art, due to the fact that a large-size tugboat is needed for hauling the foundation, the installation cost of the foundation of the offshore wind power set is high is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly relates to a foundation for an offshore wind turbine with a steel-concrete composite structure. Background Art

[0002] In the Qianhai area, the foundation for an offshore wind turbine usually adopts a single-pile foundation. In its basic installation process, the foundation is placed on a tugboat, and a large-sized tugboat is used to transport the foundation to a designated location at sea. Then, the lifting equipment on the hull is used to vertically lift the foundation, and gradually lower the foundation into the sea until the bottom of the foundation is inserted into the seabed. Subsequently, a pile driving device is used to apply a downward force to the upper end of the foundation, so that the lower end of the foundation is inserted into the seabed. Finally, the bottom of the upright pole of the offshore wind turbine is installed on the upper end of the foundation for the offshore wind turbine.

[0003] The problems existing in the existing foundation for an offshore wind turbine are as follows: A tugboat is required to tow the foundation to the designated installation position, and the use of the tugboat will increase the installation cost of the foundation; in addition, when installing the foundation, the lifting equipment needs to vertically lift the foundation to a vertical posture and then gradually lower it into the sea. The lifting equipment needs to have a high lifting height and a large lifting weight, which is difficult to operate and also has high requirements for the lifting equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a foundation for an offshore wind turbine with a steel-concrete composite structure, so as to solve the technical problem that the existing technology requires a large-sized tugboat to tow the foundation, resulting in a relatively high installation cost of the foundation for an offshore wind turbine.

[0005] To solve the above technical problem, the technical solution of a foundation for an offshore wind turbine with a steel-concrete composite structure in the present invention is as follows: A foundation for an offshore wind turbine with a steel-concrete composite structure includes a bottom foundation, an intermediate foundation, and an upper foundation arranged in sequence from bottom to top. The bottom foundation and the intermediate foundation are of a hollow structure. An inner cavity partition is guidingly and movably assembled in the inner cavity of the bottom foundation. The lower end of the intermediate foundation is guidingly and movably assembled in the inner cavity of the bottom foundation. The inner cavity partition divides the inner cavity of the bottom foundation into a lower cavity and an upper cavity communicating with the inner cavity of the intermediate foundation. A bottom foundation passage communicating with the lower cavity is provided at the lower end of the bottom foundation. A passage valve is provided on the bottom foundation passage. A counterweight block for the intermediate foundation is provided at the upper end of the intermediate foundation. The lower end of the upper foundation is guidingly and movably assembled in the inner cavity of the intermediate foundation. A plurality of upper foundation cavities are provided at intervals in the vertical direction in the upper foundation.

[0006] Furthermore, a partition accommodating groove for accommodating the inner cavity partition when the inner cavity partition moves downward from top to bottom is provided on the lower side wall of the lower cavity, and the bottom foundation channel is provided on the groove wall of the partition accommodating groove.

[0007] Furthermore, a partition channel is provided on the inner cavity partition. The partition channel includes an axial channel portion with an upper end communicating with the inner cavity of the intermediate foundation and a radial channel portion communicating with the lower end of the axial channel portion. After the inner cavity partition is placed in the partition accommodating groove, the radial channel portion communicates with the bottom foundation channel.

[0008] Furthermore, the height of the intermediate foundation is greater than the inner cavity length of the bottom foundation, and the height of the upper end foundation is greater than the height of the intermediate foundation.

[0009] Furthermore, the bottom foundation includes a bottom foundation steel pipe and bottom foundation concrete cast and fixed on the outer periphery of the bottom foundation steel pipe. The lower end of the bottom foundation concrete is a tapered structure with a larger upper part and a smaller lower part, and the inner cavity of the bottom foundation is formed by the inner hole of the bottom foundation steel pipe.

[0010] Furthermore, the intermediate foundation includes an intermediate foundation steel pipe. The inner cavity of the intermediate foundation is formed by the inner hole of the intermediate foundation steel pipe. The foundation counterweight is a concrete block, and the foundation counterweight is fixed to the upper end of the intermediate foundation steel pipe.

[0011] Furthermore, the upper end foundation includes an upper end foundation steel pipe that is in guiding and moving fit with the inner hole of the intermediate foundation steel pipe. The upper end foundation further includes upper end foundation concrete cast and fixed in the inner hole of the upper end foundation steel pipe, and an upper end foundation cavity is provided in the upper end foundation concrete.

[0012] Furthermore, an upper end foundation mounting plate is fixed to the upper end of the upper end foundation concrete. Upper side connection ears are provided on the outer periphery of the upper end foundation mounting plate. An intermediate foundation mounting plate is provided on the upper end of the foundation counterweight. Lower side connection ears are provided on the intermediate foundation mounting plate. The wind turbine generator foundation further includes a connecting rod for connecting between the upper side connection ears and the lower side connection ears through bolts.

[0013] The beneficial effects of the present invention are as follows: The foundation of the offshore wind turbine in the present invention can float on the sea surface and be towed to the designated installation location. Therefore, large-sized towboats are not required. Specifically, the bottom foundation, the middle foundation, and the upper foundation are unfolded in sequence. The inner cavity of the bottom foundation, the inner cavity of the middle foundation, and the cavity of the upper foundation together form a buoyancy cavity, enabling the entire foundation of the offshore wind power unit to float on the sea surface for horizontal towing. The foundation counterweight plays a balancing role. When the entire foundation of the wind turbine is towed to the designated location, the lifting device is connected to the upper end of the upper foundation through a steel wire rope. The channel valve is opened, and seawater enters the inner cavity of the bottom foundation. The inner cavity partition can prevent seawater from entering the inner cavity of the middle foundation. Without the need for the lifting device to work, the situation of the lower end sinking and the upper end being light will occur in the foundation of the offshore wind power unit. In this way, the foundation of the offshore wind power unit will naturally be in an upright state and sink naturally. Under the action of the weight of the foundation counterweight, the middle foundation descends, pushing the inner cavity partition to the bottom of the inner cavity of the bottom foundation, discharging the seawater in the inner cavity of the bottom foundation. The upper foundation will also move downward under its own weight to fill the inner cavity of the middle foundation until the bottom foundation lands on the seabed. During the entire process, the lifting device does not need to lift the foundation of the offshore wind power unit to a vertical posture, only needs to play an auxiliary correction role, reducing the requirements for the lifting device. Finally, the pressing device is used to apply pressure to the top of the upper foundation to press the bottom foundation into the seabed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 FIG. is a schematic view of the state of being towed in an embodiment of the foundation of the offshore wind turbine in the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 FIG. is a schematic view of the state after the channel valve is opened in this embodiment; Figure 4 is Figure 3 an enlarged view of part B in Figure 5 FIG. is a schematic view of the state after the inner cavity of the middle foundation is filled with the upper foundation in this embodiment; Figure 6 is Figure 5 an enlarged view of part C in 1. Bottom foundation; 2. Inner cavity partition; 3. Intermediate foundation; 4. Foundation counterweight; 5. Upper foundation; 6. Upper foundation concrete; 7. Upper foundation steel pipe; 8. Upper side connecting ear; 9. Upper foundation mounting plate; 10. Upper foundation cavity; 11. Intermediate foundation mounting plate; 12. Lower side connecting ear; 13. Intermediate foundation steel pipe; 14. Inner cavity of the bottom foundation; 15. Bottom foundation channel; 16. Inner cavity of the intermediate foundation; 17. Partition accommodating groove; 18. Bottom foundation steel pipe; 19. Bottom foundation concrete; 20. Lower side cavity; 21. Axial channel part; 22. Radial channel part; 23. Bolt; 24. Connecting rod. Detailed implementation mode

[0015] To facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0016] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0017] An example of the foundation of an offshore wind turbine with a steel-concrete composite structure in the present invention is as Figures 1 - 6 shown: It includes a bottom foundation 1, an intermediate foundation 3, and an upper foundation 5 arranged in sequence from bottom to top. The bottom foundation 1 and the intermediate foundation 3 are hollow structures. An inner cavity partition 2 is guided and movably assembled in the inner cavity 14 of the bottom foundation. The lower end of the intermediate foundation is guided and movably assembled in the inner cavity 14 of the bottom foundation. The inner cavity partition 2 divides the inner cavity of the bottom foundation into a lower side cavity 20 and an upper side cavity communicating with the inner cavity of the intermediate foundation. The lower end of the bottom foundation is provided with a bottom foundation channel 15 communicating with the lower side cavity. A channel valve is provided on the bottom foundation channel 15. The upper end of the intermediate foundation is provided with an intermediate foundation counterweight 4. The lower end of the upper foundation 5 is guided and movably assembled in the inner cavity of the intermediate foundation. A plurality of upper foundation cavities 10 are arranged at intervals in the upper foundation 5 in the vertical direction. Each upper foundation cavity 10 can independently perform drainage and water inlet operations. By selecting the appropriate number and position of the upper foundation cavities, the center of gravity balance of the entire wind turbine foundation during the towing process can be adjusted.

[0018] In this embodiment, the bottom foundation includes a bottom foundation steel pipe 18 and bottom foundation concrete 19 poured and fixed on the outer periphery of the bottom foundation steel pipe. The lower end of the bottom foundation concrete 19 is a tapered structure with a larger upper part and a smaller lower part. The inner cavity 14 of the bottom foundation is formed by the inner hole of the bottom foundation steel pipe.

[0019] The middle foundation includes a middle foundation steel pipe 13. The inner cavity 16 of the middle foundation is formed by the inner hole of the middle foundation steel pipe 13. The foundation counterweight 4 is a concrete block, and the foundation counterweight 4 is fixed to the upper end of the middle foundation steel pipe 13. The lower end of the middle foundation steel pipe 13 is guidingly and movably assembled in the inner hole of the bottom foundation steel pipe 18.

[0020] The inner cavity partition 2 is guidingly, rotationally and movably assembled in the inner hole of the bottom foundation steel pipe 18. The anti-rotation between the inner cavity partition 2 and the bottom foundation steel pipe 18 can be achieved by arranging key bars on the bottom foundation steel pipe and key grooves on the inner cavity partition that cooperate with the key bars. The middle foundation steel pipe is located above the inner cavity partition. A partition accommodating groove 17 for accommodating the inner cavity partition when it moves downward is provided on the lower side wall of the lower side cavity. The bottom foundation passage 15 is provided on the groove wall of the partition accommodating groove 17. The partition accommodating groove 17 is adapted to the inner cavity partition 2. Adaptation means that the groove depth of the partition accommodating groove is the same as the height of the inner cavity partition, and the diameter of the partition accommodating groove is the same as the diameter of the inner cavity partition.

[0021] A partition passage is provided on the inner cavity partition. The partition passage includes an axial passage part 21 with an upper end communicating with the inner cavity of the middle foundation and a radial passage part 22 communicating with the lower end of the axial passage part. After the inner cavity partition 2 is in the partition accommodating groove 17, the radial passage part 22 communicates with the bottom foundation passage 15. When the inner cavity partition 2 does not enter the partition accommodating groove, the outer end of the radial passage part 22 is blocked by the inner wall of the bottom foundation steel pipe, so the partition passage is in a closed state.

[0022] The height of the middle foundation 3 is greater than the inner cavity length of the bottom foundation 1, and the height of the upper end foundation 5 is greater than the height of the middle foundation 3.

[0023] In this embodiment, the upper end foundation 5 includes an upper end foundation steel pipe 7 that is guidingly and movably matched with the inner hole of the middle foundation steel pipe. The upper end foundation further includes upper end foundation concrete 6 poured and fixed in the inner hole of the upper end foundation steel pipe. An upper end foundation cavity 10 is provided in the upper end foundation concrete 6. An upper end foundation mounting plate 9 is fixed to the upper end of the upper end foundation concrete 6. Upper side connection ears 8 are provided on the outer periphery of the upper end foundation mounting plate 9. A middle foundation mounting plate 11 is provided at the upper end of the foundation counterweight. Lower side connection ears 12 are provided on the middle foundation mounting plate 11. The wind turbine foundation further includes a connecting rod 24 for connecting between the upper side connection ears 8 and the lower side connection ears 12 through bolts 23.

[0024] The foundation of an offshore wind turbine is towed to the installation site in a floating posture on the sea surface. During the towing process, the connecting rod is not connected between the upper connecting ear and the lower connecting ear, and the bottom foundation, the middle foundation, and the upper foundation are in a deployed state. As Figure 1 shown, at this time, the inner cavity size of the entire offshore wind turbine foundation is the largest, and a relatively large buoyancy can be obtained so that the entire offshore wind turbine foundation can float on the sea surface. The setting of the upper foundation cavity can, on the one hand, reduce the amount of concrete used in the upper foundation. Additionally, it can adjust the balance of the entire offshore wind turbine foundation by selectively filling water into the air inside the upper foundation at corresponding positions and in corresponding quantities.

[0025] A small tugboat is used to tow the bottom foundation until the offshore wind turbine foundation is towed to the designated installation position. Subsequently, the lifting equipment is connected to the upper foundation through a steel wire rope, and the channel valve is opened. Seawater enters the lower cavity below the inner cavity partition through the bottom foundation channel. The inner cavity partition can prevent seawater from entering the inner cavity of the middle foundation. In this way, the situation of the bottom foundation end being heavy will occur for the offshore wind turbine foundation, and the offshore wind turbine foundation can quickly tilt and sink. After the offshore wind turbine foundation tilts, under the action of the foundation counterweight block, the middle foundation pushes the inner cavity partition downward. The movement of the inner cavity partition can squeeze the seawater in the lower cavity out through the bottom foundation channel again. When the inner cavity partition enters the partition receiving groove, the radial channel part of the partition channel can be connected to the bottom foundation channel. At this time, the inner cavity of the middle foundation is in communication with the seawater, and the upper foundation can move downward relative to the middle foundation under its own weight. In this way, the sequential action process of the bottom foundation tilting first, then the middle foundation moving downward relative to the bottom foundation, and finally the upper foundation moving downward relative to the middle foundation is realized, which is very orderly and safe.

[0026] until the bottom of the upper foundation also abuts against the upper end of the inner cavity partition, as Figure 3 shown. The conical tip structure of the bottom foundation is inserted into the seabed. A connecting rod is connected between the upper connecting ear and the lower connecting ear to ensure the strength of the upper contact mounting plate and position the upper foundation and the middle foundation. Finally, a pressing device is used to apply a downward force to the upper foundation to firmly insert the bottom foundation into the seabed, and the installation of the offshore wind turbine foundation is completed. The vertical pole of the offshore wind turbine can be installed on the upper foundation mounting plate of the upper foundation.

[0027] In the above description of this specification, unless otherwise clearly specified and defined, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, regarding the term "connected", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two components or the interaction relationship between two components. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific circumstances.

[0028] According to the above description of this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of this specification. They are only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or component involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0029] In addition, the terms "first" or "second" etc. used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" can explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A steel-concrete composite structure offshore wind turbine foundation, characterized by: It includes a bottom foundation, an intermediate foundation and an upper foundation which are arranged in sequence from bottom to top, the bottom foundation and the intermediate foundation are hollow structures, the inner cavity of the bottom foundation is guided and movable by an inner cavity partition, the lower end of the intermediate foundation is guided and movable in the inner cavity of the bottom foundation, the inner cavity partition divides the inner cavity of the bottom foundation into a lower cavity and an upper cavity connected to the inner cavity of the intermediate foundation, the lower end of the bottom foundation is provided with a bottom foundation channel connected to the lower cavity, the bottom foundation channel is provided with a channel valve, the upper end of the intermediate foundation is provided with an intermediate foundation counterweight block, the lower end of the upper foundation is guided and movable in the inner cavity of the intermediate foundation, and the upper foundation is provided with a plurality of upper foundation cavities spaced apart along the up and down directions.

2. The offshore wind turbine foundation according to claim 1, characterized in that: A partition accommodating groove for accommodating the inner cavity partition when the inner cavity partition moves from top to bottom is arranged on the lower side wall of the lower cavity, and the bottom basic channel is arranged on the groove wall of the partition accommodating groove.

3. The wind turbine foundation according to claim 2, characterized in that: A partition channel is arranged on the inner cavity partition, and the partition channel includes an axial channel part whose upper end is connected with the inner cavity of the middle base and a radial channel part which is connected with the lower end of the axial channel part. After the inner cavity partition is in the partition accommodating groove, the radial channel part is connected with the bottom base channel.

4. The wind turbine foundation according to claim 1, characterized in that: The height of the middle foundation is greater than the inner cavity length of the bottom foundation, and the height of the upper foundation is greater than the height of the middle foundation.

5. The wind turbine foundation according to claim 1, characterized in that: The bottom foundation includes a bottom foundation steel pipe and bottom foundation concrete cast and fixed on the outer periphery of the bottom foundation steel pipe. The lower end of the bottom foundation concrete is a cone-shaped structure with a larger upper portion and a smaller lower portion. The inner cavity of the bottom foundation is formed by the inner hole of the bottom foundation steel pipe.

6. The wind turbine foundation according to any one of claims 1 to 5, characterized in that: The intermediate foundation comprises an intermediate foundation steel pipe, the inner cavity of the intermediate foundation is formed by the inner hole of the intermediate foundation steel pipe, the foundation counterweight block is a concrete block, and the foundation counterweight block is fixed to the upper end of the intermediate foundation steel pipe.

7. The wind turbine foundation according to claim 6, characterized in that: The upper foundation includes an upper foundation steel pipe that is guided and moved with the inner hole of the middle foundation steel pipe. The upper foundation also includes upper foundation concrete cast and fixed in the inner hole of the upper foundation steel pipe, and the upper foundation cavity is set in the upper foundation concrete.

8. The wind turbine foundation according to claim 7, characterized in that: An upper foundation mounting plate is fixed to the upper end of the upper foundation concrete, an upper connecting ear is arranged on the outer periphery of the upper foundation mounting plate, an intermediate foundation mounting plate is arranged on the upper end of the foundation counterweight block, a lower connecting ear is arranged on the intermediate foundation mounting plate, and the wind turbine foundation also includes a connecting rod for connecting between the upper connecting ear and the lower connecting ear by bolts.

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