Double-layer concrete bearing platform suction bucket foundation and offshore wind turbine

Abstract

The utility model relates to a double-layer concrete bearing platform suction bucket foundation and an offshore wind turbine. The method is suitable for the technical field of offshore wind power. The technical problem to be solved by the utility model is to provide the double-layer concrete bearing platform suction bucket foundation and the offshore wind turbine. According to the technical scheme, the device comprises a first concrete bearing platform used for being connected with an offshore wind turbine tower; the second concrete bearing platform is arranged below the first concrete bearing platform, and the frame size of the second concrete bearing platform is larger than that of the first concrete bearing platform; the first ends of the foundation supporting rods are connected into the first concrete bearing platform, the second ends of the foundation supporting rods are connected into the second concrete bearing platform, and the foundation supporting rods are arranged in the annular direction of the first concrete bearing platform and the second concrete bearing platform at intervals; the suction bucket structure is arranged at the bottom of the second concrete bearing platform, the suction bucket structure is matched with the frame structure of the second concrete bearing platform, and the suction bucket structure is used for being fixed to the seabed.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power, in particular to a double-layer concrete caisson suction bucket foundation and an offshore wind turbine. Background Technique

[0002] In recent years, with the intensification of global climate change, countries have successively put forward low-carbon and environmental protection development strategies. As an important part of clean energy, offshore wind power has great development potential.

[0003] With the development of offshore wind power, it will inevitably develop towards the deep sea in the future. The cost of floating wind turbine foundations is relatively high, and the cost of jacket foundations is also relatively high due to the large number of joints. The problems existing in traditional caisson foundations are as follows:

[0004] Due to the excessive length of steel pipe piles and the position of the embedment point to the mud surface, the problem of steel pipe pile cantilever is relatively prominent. There are overall and local stability problems with steel pipe piles, which are not suitable for deep water areas. Moreover, for the offshore cast-in-situ concrete caisson foundation, the construction period is long, while the actual construction window period at sea is short and the cost is high. Therefore, it is imperative to study a new type of wind turbine foundation suitable for deep sea wind farms. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: in view of the above problems, to provide a double-layer concrete caisson suction bucket foundation and an offshore wind turbine.

[0006] The technical solution adopted by the utility model is: a double-layer concrete caisson suction bucket foundation, characterized by comprising:

[0007] A first concrete caisson for connecting the tower barrel of the offshore wind turbine;

[0008] A second concrete caisson is arranged below the first concrete caisson, and the frame size of the second concrete caisson is larger than that of the first concrete caisson;

[0009] A plurality of foundation support rods, the first ends of the foundation support rods are connected to the inside of the first concrete caisson, the second ends of the foundation support rods are connected to the inside of the second concrete caisson, and the plurality of foundation support rods are arranged at intervals along the circumferential direction of the first concrete caisson and the second concrete caisson;

[0010] A suction bucket structure is arranged at the bottom of the second concrete caisson, the suction bucket structure is adapted to the frame structure of the second concrete caisson, and the suction bucket structure is used to be fixed on the seabed.

[0011] Through the above technical means, a plurality of basic support rods are used to connect the first concrete cap and the second concrete cap at both ends, thereby forming a double-layer concrete cap. Both ends of the basic support rods are constrained by concrete, reducing risks such as overall instability and buckling. A suction bucket structure is connected to the bottom of the second concrete cap, and the suction bucket structure can be fixed to the seabed by means of the suction bucket.

[0012] In some embodiments, the suction bucket structure includes a suction bucket top plate, a suction bucket inner side plate, a suction bucket outer side plate, and a suction bucket compartment plate. The suction bucket top plate is connected to the bottom of the second concrete cap. The suction bucket inner side plate is welded to the inner circle at the bottom of the suction bucket top plate. The suction bucket outer side plate is welded to the outer circle at the bottom of the suction bucket top plate. A plurality of the suction bucket compartment plates are provided between the suction bucket outer side plate and the suction bucket inner side plate.

[0013] In some embodiments, the first end of the basic support rod is connected to the inside of the first concrete cap through a first anchor plate, and the second end of the basic support rod is connected to the inside of the second concrete cap through a second anchor plate. The second end of the basic support rod extends to the inner bottom of the second concrete cap and is connected to the suction bucket top plate.

[0014] In some embodiments, if the first concrete cap has a hexagonal structure, the second concrete cap includes a concrete bottom outer beam and a concrete bottom strengthening beam. A plurality of the concrete bottom strengthening beams are connected to the inside of the concrete bottom outer beam. The first concrete cap is connected to the concrete bottom outer beam through six of the basic support rods; or

[0015] The first concrete cap has a disc-shaped structure. The second concrete cap includes a concrete bottom outer beam and a concrete bottom strengthening beam. A plurality of the concrete bottom strengthening beams are connected to the inside of the concrete bottom outer beam. The first concrete cap is connected to the concrete bottom outer beam through eight of the basic support rods.

[0016] In some embodiments, if the first concrete cap has a hexagonal structure, the framework of the concrete bottom outer beam has a regular triangular structure, and the end of the basic support rod is connected to the corner of the concrete bottom outer beam; or

[0017] The framework of the concrete bottom outer beam has an annular structure. The first ends of three of the concrete bottom strengthening beams are all connected and are on the axis of the concrete bottom outer beam. The second ends of the three concrete bottom strengthening beams are connected to the inside of the concrete bottom outer beam at intervals. The ends of the basic support rods are connected to the concrete bottom outer beam at intervals.

[0018] In some embodiments, if the first concrete bearing platform has a disc-shaped structure, the frame of the concrete bottom outer beam has a regular quadrilateral structure, two of the concrete bottom strengthening beams are arranged on the diagonal lines of the concrete bottom outer beam, and the end of the foundation support rod is connected to the corner of the concrete bottom outer beam; or

[0019] The frame of the concrete bottom outer beam has an annular structure, two of the concrete bottom strengthening beams are arranged perpendicular to each other inside the concrete bottom outer beam, and the ends of the foundation support rods are connected to the concrete bottom outer beam at intervals.

[0020] In some embodiments, the foundation support rods are arranged in pairs in a "V" shape.

[0021] Another technical solution adopted by the present utility model is: an offshore wind turbine, characterized by comprising:

[0022] A double-layer concrete bearing platform suction bucket foundation;

[0023] A wind turbine assembly, connected to the top of the first concrete bearing platform.

[0024] In some embodiments, the wind turbine tower in the wind turbine assembly is fixed to the inside of the first concrete bearing platform through high-strength prestressed bolts and connecting flanges.

[0025] The beneficial effects of the present utility model are:

[0026] 1. By connecting the first concrete bearing platform and the second concrete bearing platform with multiple foundation support rods to form a double-layer concrete bearing platform, both ends of the foundation support rods are constrained by concrete, and their sizes can be determined according to the water depth, reducing risks such as overall instability and buckling. Moreover, the foundation support rods are arranged at intervals along the circumferential direction of the concrete bearing platform, making the stress distribution more uniform, reducing the possibility of local stress concentration, having no rod connection points inside the bearing platform, reducing the risk of fatigue damage, and extending the service life of the structure.

[0027] 2. The entire foundation structure can be prefabricated on land and then transported to the site as a whole, reducing the cycle of offshore construction operations. At the same time, the concrete bearing platform is constructed on land, and the quality is more controllable compared to offshore construction, reducing the risks of offshore construction operations. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the present application.

[0029] Figure 2 is a top view schematic diagram of the first concrete bearing platform in the present application with a hexagonal structure.

[0030] Figure 3 is a top view schematic diagram of the first concrete bearing platform in the present application with a disc-shaped structure.

[0031] Figure 4 It is a top view schematic diagram of the frame of the concrete bottom outer beam in the present application showing a regular triangular structure.

[0032] Figure 5 It is a top view schematic diagram of the frame of the concrete bottom outer beam in the present application showing an annular structure. (Three concrete bottom strengthening beams)

[0033] Figure 6 It is a top view schematic diagram of the frame of the concrete bottom outer beam in the present application showing a regular quadrilateral structure.

[0034] Figure 7 It is a top view schematic diagram of the frame of the concrete bottom outer beam in the present application showing an annular structure. (Two concrete bottom strengthening beams)

[0035] Explanation of reference numerals:

[0036] 1. First concrete bearing platform; 2. Second concrete bearing platform; 3. Foundation support rod; 4. Suction bucket structure; 5. Wind turbine tower barrel; 6. Connecting flange; 7. High-strength prestressed bolt; 8. Suction bucket top plate; 9. Inner side plate of suction bucket; 10. Outer side plate of suction bucket; 11. Compartment plate of suction bucket; 12. First anchor plate; 13. Second anchor plate; 14. Concrete bottom outer beam; 15. Concrete bottom strengthening beam.

[0037] This specification includes references to "one embodiment" or "embodiments". The phrases "in one embodiment" or "in embodiments" do not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with the present disclosure.

[0038] "Comprising", this term is open-ended. As used in the appended claims, this term does not exclude additional structures or steps.

[0039] "First", "second", etc. As used herein, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). Detailed implementation manners

[0040] To enable those skilled in the art of this technology to better understand the solution of this utility model, the technical solution of this utility model will be further described below in conjunction with specific embodiments.

[0041] Embodiment 1:

[0042] In combination with Figures 1 to 7As shown in the figure, this embodiment is a double-layer concrete caisson suction bucket foundation, which includes a first concrete caisson 1, a second concrete caisson 2, a plurality of foundation support rods 3 and a suction bucket structure 4. The first concrete caisson 1 is used to connect the offshore wind turbine tower 5. The second concrete caisson 2 is arranged below the first concrete caisson 1, and the frame size of the second concrete caisson 2 is larger than that of the first concrete caisson 1, which is beneficial to reducing the overall engineering quantity of the structure and increasing the structural stability. The first concrete caisson 1 and the second concrete caisson 2 are connected by a plurality of foundation support rods 3. Specifically, the first end of the foundation support rod 3 is connected to the inside of the first concrete caisson 1, and the second end of the foundation support rod 3 is connected to the inside of the second concrete caisson 2. The plurality of foundation support rods 3 are arranged at intervals along the circumferential direction of the first concrete caisson 1 and the second concrete caisson 2. The suction bucket structure 4 is connected to the bottom of the second concrete caisson 2, and the suction bucket structure 4 is adapted to the frame structure of the second concrete caisson 2. After the overall structure is constructed on land, it is transported to the sea as a whole, and the suction bucket structure 4 is penetrated into the mud surface by using negative pressure.

[0043] In some embodiments, the suction bucket structure 4 includes a suction bucket top plate 8, a suction bucket inner side plate 9, a suction bucket outer side plate 10 and a suction bucket compartment plate 11. The suction bucket top plate 8 is connected to the bottom of the second concrete caisson 2 by portal ribs or rivets. The suction bucket inner side plate 9 is welded to the inner circle of the bottom of the suction bucket top plate 8. The suction bucket outer side plate 10 is welded to the outer circle of the bottom of the suction bucket top plate 8. A plurality of suction bucket compartment plates 11 are arranged between the suction bucket outer side plate 10 and the suction bucket inner side plate 9.

[0044] Furthermore, the first end of the foundation support rod 3 is connected to the inside of the first concrete caisson 1 through a first anchor plate 12, and the second end of the foundation support rod 3 is connected to the inside of the second concrete caisson 2 through a second anchor plate 13, which increases the connectivity between the foundation support rod 3 and the first concrete caisson 1 and the second concrete caisson 2. The second end of the foundation support rod 3 extends to the inner bottom of the second concrete caisson 2 and is welded to the suction bucket top plate 8.

[0045] In some embodiments, the first concrete caisson 1 adopts a circular structure or a polygonal structure. The second concrete caisson 2 includes a concrete bottom outer beam 14 and a concrete bottom strengthening beam 15. A number of concrete bottom strengthening beams 15 are connected to the inside of the concrete bottom outer beam 14. The first concrete caisson 1 is connected to the concrete bottom outer beam 14 through a plurality of foundation support rods 3.

[0046] In some embodiments, such as Figure 2 and Figure 4As shown, the first concrete pile cap 1 is hexagonal in structure, and the frame of the concrete bottom outer beam 14 is equilateral triangular in structure. The first concrete pile cap 1 is connected to the concrete bottom outer beam 14 by six foundation support rods 3. The ends of the foundation support rods 3 are connected to the corners of the concrete bottom outer beam 14. The size of the suction bucket top plate 8 is the same as the frame size of the concrete bottom outer beam 14. In this embodiment, in order to reduce the sizes of the suction bucket outer plate 10 and the suction bucket inner plate 9, 3 to 6 suction bucket partition plates 11 are arranged in the middle. At the same time, the foundation support rods 3 are arranged in pairs in a "V" shape to increase the foundation's bending resistance.

[0047] In some embodiments, such as Figure 2 and Figure 5 As shown, the first concrete pile cap 1 is hexagonal in structure, and the frame of the concrete bottom outer beam 14 is circular in structure. The first concrete pile cap 1 is connected to the concrete bottom outer beam 14 by six foundation support rods 3. Specifically, three concrete bottom strengthening beams 15 are connected to the inside of the concrete bottom outer beam 14. The first ends of the three concrete bottom strengthening beams 15 are all connected and located on the axis of the concrete bottom outer beam 14. The second ends of the three concrete bottom strengthening beams 15 are evenly spaced and connected to the inside of the concrete outer beam. Two foundation support rods 3 are arranged in pairs on the top of the concrete bottom outer beam 14 on both sides of the second ends of the concrete bottom strengthening beams 15. Correspondingly, the suction bucket top plate 8 is arranged in a circular structure, the suction bucket outer plate 10 is in a cylindrical structure, and a suction bucket partition plate 11 is arranged inside the concrete bottom strengthening beam 15.

[0048] In some embodiments, such as Figure 3 and Figure 6 As shown, the first concrete pile cap 1 is disc-shaped in structure, and the frame of the concrete bottom outer beam 14 is square in structure. The first concrete pile cap 1 is connected to the concrete bottom outer beam 14 by eight foundation support rods 3. Specifically, two concrete bottom strengthening beams 15 are arranged on the diagonals of the concrete bottom outer beam 14. The ends of the foundation support rods 3 are connected in pairs to the corners of the concrete bottom outer beam 14. A suction bucket partition plate 11 is arranged inside the concrete bottom strengthening beam 15.

[0049] In some embodiments, such as Figure 3 and Figure 7 As shown, the first concrete pile cap 1 is disc-shaped in structure, and the frame of the concrete bottom outer beam 14 is circular in structure. Two concrete bottom strengthening beams 15 are arranged perpendicular to each other inside the concrete bottom outer beam 14. The ends of multiple foundation support rods 3 are evenly spaced and connected to the top of the concrete bottom outer beam 14. Specifically, six or eight foundation support rods 3 can be used, and the number is determined according to the actual design.

[0050] The implementation principle of an embodiment of a double-layer concrete pile cap suction bucket foundation is as follows:

[0051] At both ends of the foundation support rod 3 in this structure, it is constrained by concrete. The size of the foundation support rod 3 can be determined according to the water depth, reducing risks such as overall instability and buckling. At the same time, the foundation support rod 3 is a circular pipe without rod joints, and the fatigue problem is relatively small. This structure enhances the foundation's anti-scouring ability and reduces the foundation treatment cost.

[0052] The overall foundation structure can be prefabricated on land and then transported to the site as a whole, reducing the offshore construction operation cycle. At the same time, the construction quality on land is controllable, reducing the risks of offshore construction operations. Considering the transportation problem, the suction bucket structure is a cavity structure, and a water seal can be formed at the lower part to reduce the weight during offshore transportation. In this embodiment, the installation of the upper wind turbine is not considered, so the transportation difficulty is greatly reduced.

[0053] All structural dimensions are conventional components, avoiding the rolling processing of thick-walled and large-diameter steel pipes, and the processing technology is simple.

[0054] Embodiment 2:

[0055] This embodiment is an offshore wind turbine, including the double-layer concrete caisson suction bucket foundation and the wind turbine assembly as described in Embodiment 1. The double-layer concrete caisson suction bucket foundation is fixed on the seabed, and the wind turbine tower 5 in the wind turbine assembly is fixed in the first concrete caisson 1 through high-strength prestressed bolts 7 and connecting flanges 6.

[0056] The above are all the preferred embodiments of the present invention. The protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double-layer concrete pile cap suction bucket foundation, characterized in that, Comprising: A first concrete pile cap (1) for connecting an off - shore wind turbine tower barrel (5); A second concrete pile cap (2) provided below the first concrete pile cap (1), the frame size of the second concrete pile cap (2) being larger than that of the first concrete pile cap (1); A plurality of foundation support rods (3), the first ends of the foundation support rods (3) being connected inside the first concrete pile cap (1), the second ends of the foundation support rods (3) being connected inside the second concrete pile cap (2), and the plurality of foundation support rods (3) being arranged at circumferential intervals between the first concrete pile cap (1) and the second concrete pile cap (2); A suction bucket structure (4) provided at the bottom of the second concrete pile cap (2), the suction bucket structure (4) being adapted to the frame structure of the second concrete pile cap (2) and being used for fixing to the seabed.

2. The suction bucket foundation of a double-layer concrete pile cap according to claim 1, wherein: The suction bucket structure (4) includes a suction bucket top plate (8), a suction bucket inner side plate (9), a suction bucket outer side plate (10) and a suction bucket compartment plate (11). The suction bucket top plate (8) is connected to the bottom of the second concrete pile cap (2). The suction bucket inner side plate (9) is welded to the inner circle at the bottom of the suction bucket top plate (8). The suction bucket outer side plate (10) is welded to the outer circle at the bottom of the suction bucket top plate (8). A plurality of the suction bucket compartment plates (11) are provided between the suction bucket outer side plate (10) and the suction bucket inner side plate (9).

3. A suction bucket foundation for a double-layer concrete pile cap according to claim 2, characterized in that: The first ends of the foundation support rods (3) are connected to the inside of the first concrete pile cap (1) via a first anchor plate (12), the second ends of the foundation support rods (3) are connected to the inside of the second concrete pile cap (2) via a second anchor plate (13), and the second ends of the foundation support rods (3) extend to the inner bottom of the second concrete pile cap (2) and are connected to the suction bucket top plate (8).

4. The suction bucket foundation of a double-layer concrete pile cap according to claim 1, characterized in that: The first concrete pile cap (1) is in a hexagonal structure. The second concrete pile cap (2) includes a concrete bottom outer side beam (14) and a concrete bottom strengthening beam (15). A number of the concrete bottom strengthening beams (15) are connected to the inside of the concrete bottom outer side beam (14). The first concrete pile cap (1) is connected to the concrete bottom outer side beam (14) via six of the foundation support rods (3); or The first concrete pile cap (1) is in a disc - shaped structure. The second concrete pile cap (2) includes a concrete bottom outer side beam (14) and a concrete bottom strengthening beam (15). A number of the concrete bottom strengthening beams (15) are connected to the inside of the concrete bottom outer side beam (14). The first concrete pile cap (1) is connected to the concrete bottom outer side beam (14) via eight of the foundation support rods (3).

5. A double-layer concrete pile cap suction bucket foundation according to claim 4, characterized in that: If the first concrete pile cap (1) is in a hexagonal structure, the frame of the concrete bottom outer side beam (14) is in a regular triangular structure, and the ends of the foundation support rods (3) are connected to the corners of the concrete bottom outer side beam (14); or The frame of the concrete bottom outer beam (14) is in an annular structure. The first ends of the three concrete bottom strengthening beams (15) are all connected and located on the axis of the concrete bottom outer beam (14). The second ends of the three concrete bottom strengthening beams (15) are connected to the inner side of the concrete bottom outer beam (14) at intervals. The ends of the foundation support rods (3) are connected to the concrete bottom outer beam (14) at intervals.

6. The suction bucket foundation of a double-layer concrete pile cap according to claim 4, characterized in that: If the first concrete pile cap (1) is in a disc-shaped structure, the frame of the concrete bottom outer beam (14) is in a regular quadrilateral structure. Two of the concrete bottom strengthening beams (15) are arranged on the diagonals of the concrete bottom outer beam (14). The ends of the foundation support rods (3) are connected to the corners of the concrete bottom outer beam (14); or The frame of the concrete bottom outer beam (14) is in an annular structure. Two of the concrete bottom strengthening beams are arranged perpendicular to each other on the inner side of the concrete bottom outer beam (14). The ends of the foundation support rods (3) are connected to the concrete bottom outer beam (14) at intervals.

7. A double-layer concrete pile cap suction bucket foundation according to claim 4, characterized in that: The foundation support rods (3) are arranged in pairs in a "V" shape.

8. An offshore wind turbine, characterized in that, Comprising: The double-layer concrete pile cap suction bucket foundation according to any one of claims 1 to 7; A fan assembly, connected to the top of the first concrete pile cap (1).

9. The off-shore wind turbine according to claim 8, wherein: The fan tower barrel (5) in the fan assembly is fixed in the first concrete pile cap (1) through high-strength prestressed bolts (7) and a connecting flange (6).

Images