Novel three-stand-column variable-cross-section floating type offshore wind power structure foundation

Abstract

The utility model provides a novel three-stand-column variable-cross-section floating type offshore wind power structure foundation, stand column units are arranged on the periphery of the floating type foundation, heaving cabins are arranged at the bottoms of the stand column units, and buoys connected with the heaving cabins are arranged between the adjacent stand column units, so that the floating type foundation forms a regular triangle structure; an upper-section stand column and a lower-section stand column are arranged on the two sides of the stand column unit in the vertical direction respectively, a draught area under the normal operation state of the floating foundation is arranged on the outer surface of the upper-section stand column, and the maximum sectional area of the upper-section stand column in the horizontal direction is larger than that of the lower-section stand column in the horizontal direction. By means of the variable cross-section type stand column units with the transition sections, restoring force generated when the whole structure of the floating type foundation overturns can be increased, meanwhile, the lower section stand column with the size smaller than that of the upper section stand column can effectively save material consumption, reduce displacement and lower wave load, and therefore stability and economical efficiency of the structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power development, and in particular to a novel three-column variable-section floating offshore wind power structure foundation. Background Art

[0002] As the water depth increases, the form of offshore wind power foundation structure has shifted from fixed to floating from the perspective of economic efficiency and technical feasibility. The current mainstream floating foundation types of offshore wind turbines mainly include single-column type, semi-submersible type and tension leg type.

[0003] Although the semi-submersible foundation has good adaptability to water depth, it not only consumes a large amount of steel, but also cannot recover promptly and effectively to ensure the stability of the semi-submersible foundation and the wind power equipment above it when it capsizes due to the harsh marine environment. Therefore, how to optimize the structural form within a reasonable load-bearing range and thus reduce development costs is a major problem that must be solved. Utility Model Content

[0004] The purpose of the utility model is to provide a floating offshore wind power structure foundation with better hydrodynamic performance.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] A novel three-column variable-section floating offshore wind power structure foundation, wherein column units are arranged on the periphery of the floating foundation, a heave tank is arranged at the bottom of the column unit, and buoys connecting the heave tank are arranged between adjacent column units, so that the floating foundation forms an equilateral triangle structure; the column units are respectively provided with an upper column and a lower column on both sides in the vertical direction, the outer surface of the upper column is provided with a draft area in the normal operating state of the floating foundation, the maximum cross-sectional area of ​​the upper column in the horizontal direction is greater than the maximum cross-sectional area of ​​the lower column in the horizontal direction, so that the floating foundation forms a rapid recovery state when overturned, and a transition section is connected between the upper column and the lower column.

[0007] Furthermore: the upper column and the lower column are coaxially arranged.

[0008] Furthermore: a connecting truss is arranged between adjacent column units.

[0009] Furthermore, the connecting truss is provided with a support rod along the arrangement direction of the buoys, and the two ends of the support rod are respectively connected to the upper columns of the adjacent column units.

[0010] Furthermore: an oblique support rod is arranged between the support rod and the buoy in the same direction.

[0011] Furthermore, the buoy is provided with a load-increasing portion above the buoy so that the overall height of the buoy is greater than the height of the heave tank, and the end of the load-increasing portion is connected to the lower column of the column unit.

[0012] Furthermore, the heave tank is coaxial with the upper column of the column unit, and a cross-section portion is arranged on the centrifugal side of the heave tank relative to the center of the floating foundation.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model uses a variable-section column unit with a transition section, which is beneficial to increasing the restoring force of the overall floating foundation structure when it overturns. At the same time, the lower column, which is smaller in size than the upper column, can effectively save material usage, reduce displacement and reduce wave load, thereby ensuring the stability and economy of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 This is a front view structural schematic diagram of the utility model;

[0017] Figure 3 It is a side view structural schematic diagram of the utility model;

[0018] Figure 4 It is a schematic diagram of the top structure of the utility model.

[0019] The markings in the attached drawings are: 1-column unit; 11-upper column; 12-transition section; 13-lower column 13; 2-heave compartment; 21-section part; 3-buoy; 4-strut; 5-diagonal strut. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] like Figure 1-4As shown, a novel three-column variable-section floating offshore wind power structure foundation is provided, wherein a column unit 1 is arranged on the periphery of the floating foundation, a heave tank 2 is arranged at the bottom of the column unit 1, and a buoy 3 connected to the heave tank 2 is arranged between adjacent column units 1, so that the floating foundation forms a regular triangle structure; an upper column 11 and a lower column 13 are respectively arranged on both sides of the column unit 1 in the vertical direction, and the upper column 11 and the lower column 13 are coaxially arranged, and a draft area of ​​the floating foundation in normal operation is provided on the outer surface of the upper column 11, and the maximum cross-sectional area of ​​the upper column 11 in the horizontal direction is greater than the maximum cross-sectional area of ​​the lower column 13 in the horizontal direction, so that the floating foundation forms a rapid recovery state when overturned, and a truncated cone-shaped transition section 12 is connected between the upper column 11 and the lower column 13.

[0022] The wind turbine column of the floating offshore wind power structure foundation of this embodiment is a cylindrical structure with a variable cross-section. The column section of the upper column 11 of the column unit 1 at the waterline is large to ensure a sufficient waterline radius, to ensure that the floating foundation has a large moment of inertia, and then to provide sufficient rotational inertia for the entire floating wind turbine unit, to ensure that the motion response of rolling and pitching is small, and to ensure efficient power generation of the upper wind turbine unit. After a distance below the waterline, the column diameter of the column unit 1 is reduced through the transition section 12 and remains unchanged, and the lower column 13 is formed. On the one hand, the lower column 13 saves materials and reduces displacement, which can reduce costs and wave loads; on the other hand, when the structure capsizes, the water-entering section is large and the water-outlet section is small, which can increase the restoring force and help ensure the stability of the structure.

[0023] In this embodiment, a connecting truss is provided between adjacent column units 1. The connecting truss is provided with a strut 4 along the arrangement direction of the buoy 3, and the two ends of the strut 4 are respectively connected to the upper column 11 of the adjacent column unit 1. An oblique strut 5 is provided between the strut 4 and the buoy 3 in the same direction.

[0024] At the same time, the connecting truss is a K-shaped structure formed by welding the struts 4 and the diagonal struts 5, and the three cylindrical column units 1 are respectively connected through the connecting truss, so as to save material consumption while ensuring the overall stability of the structure.

[0025] In this embodiment, in order to enable the buoy 3 to effectively lower the center of gravity and improve the stability of the floating foundation while reducing the stress concentration problem of the heave tank 2 on the bottom of the column, a load-increasing portion is arranged above the buoy 3 so that the overall height of the buoy 3 is greater than the height of the heave tank 2, and the end of the load-increasing portion of the buoy 3 is connected to the lower column 13 of the column unit 1.

[0026] The interior of the buoy 3 is filled with solid ballast such as iron ore and concrete and seawater ballast to lower the center of gravity of the floating wind turbine and ensure that the structure has excellent hydrodynamic performance and wind and wave resistance.

[0027] Based on the above content, the buoy 3 increases the space for accommodating ballast through the load-increasing part thereon, so that more ballast can be loaded inside the buoy 3 to obtain a larger metacentric height; and the height of the heave tank 7 is not higher than the buoy 3, which can reduce its impact on the bottom of the wind turbine column.

[0028] In this embodiment, the heave tank 2 is coaxial with the upper column 11 of the column unit 1, and a cross-section portion 21 is provided on the centrifugal side of the heave tank 2 relative to the center of the floating foundation.

[0029] Among them, the heave tank 2 adopts a circular heave tank, which has better performance than the square design; the cross-section part 21 on the centrifugal side of the heave tank 2 is vertically cut off, so the distance from the center of the cross-section to the center of the circle is the maximum radius of the column unit 1. At the same time, it can also prevent the anchor chain from colliding with the heave tank 2, thereby improving the stability of the floating foundation.

[0030] like Figure 1 As shown, the floating foundation is a large steel structure with symmetry. In order to speed up the construction progress and reduce high-altitude operations, before it is put into production, the construction of each structural segment can be completed in the dock, and then the overall welding, pouring and assembly can be carried out on land. After the main structure of the floating foundation is completed, the corresponding ladders, anchor machines and other devices are installed accordingly. The working platform module can also be built in the factory in advance. In this way, the floating foundation can complete the installation of wind turbines and towers in the dock, and then transport them to the working sea area by wet or dry dragging, and then connect the anchor chain in the mooring system to moor the entire device on the seabed.

[0031] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A novel three-column variable-section floating offshore wind power structure foundation, characterized by: A floating foundation is provided with column units (1) on its periphery, a heave tank (2) is provided at the bottom of the column units (1), and buoys (3) connected to the heave tanks (2) are provided between adjacent column units (1), so that the floating foundation forms an equilateral triangle structure; The column unit (1) is provided with an upper column (11) and a lower column (13) on both sides in the vertical direction, respectively; the outer surface of the upper column (11) is provided with a draft area in the normal operation state of the floating foundation; the maximum cross-sectional area of ​​the upper column (11) in the horizontal direction is greater than the maximum cross-sectional area of ​​the lower column (13) in the horizontal direction, so that the floating foundation forms a rapid recovery state when overturned; and a transition section (12) is connected between the upper column (11) and the lower column (13).

2. According to claim 1, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: The upper column (11) and the lower column (13) are coaxially arranged.

3. According to claim 1, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: A connecting truss is provided between adjacent column units (1).

4. According to claim 3, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: The connecting truss is provided with a support rod (4) along the arrangement direction of the buoy (3), and the two ends of the support rod (4) are respectively connected to the upper columns (11) of the adjacent column units (1).

5. According to claim 4, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: An oblique support rod (5) is arranged between the support rod (4) and the buoy (3) in the same direction.

6. According to claim 1, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: The buoy (3) has a load-increasing portion arranged above it, and an end of the load-increasing portion is connected to a lower column (13) of the column unit (1).

7. According to claim 1, a novel three-column variable-section floating offshore wind power structure foundation is characterized by: The heave tank (2) is coaxial with the upper column (11) of the column unit (1), and a cross-section portion (21) is provided on the centrifugal side of the heave tank (2) relative to the center of the floating foundation.

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