A pile foundation anti-scour system and method for offshore wind power

Abstract

The present invention discloses an offshore wind power pile foundation anti-scour system and method, the system includes a slope section system, a top section system and a three-dimensional support structure; the three-dimensional support structure is in a trapezoidal shape, including a base, a top horizontal surface and an inclined slope surface; the inclined slope surface connects the base and the top horizontal surface; the slope section system and the top section system are both grid structures, the grid system is composed of grids and columns, and each grid is vertically fixed by two columns; a vertical slope section system is arranged on the inclined slope surface, and a vertical top section system is arranged on the top horizontal surface. The present invention slows down the flow velocity of water and blocks the sediment near the bottom of the seabed through a multi-layer grid structure; the inclined slope surface of the three-dimensional support structure is set to further increase the flow resistance and reduce the flow velocity of water; through the combination of the three-dimensional support structure and the grid structure, the seabed roughness is significantly increased, the water flow velocity is reduced, and the purpose of foundation anti-scour is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to an offshore wind power pile foundation anti-scour system and method. Background Art

[0002] With the rapid growth of offshore wind turbine installation capacity on single pile foundation, the anti-scour problem of its foundation has attracted increasing attention. The anti-scour technology of traditional pile foundation is to improve the anti-scour ability by laying protective layers such as stones, concrete blocks, sandbags, etc. within the foundation range. Generally, the engineering workload is large and the protective effect is average. Summary of the invention

[0003] In order to solve the above technical problems, the present invention aims to provide a pile foundation anti-scouring system and method for offshore wind power, which can reduce the water flow velocity in the protection area and achieve the purpose of foundation anti-scouring.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An offshore wind power pile foundation anti-scour system includes a slope section system, a top section system and a three-dimensional support structure;

[0006] The three-dimensional support structure is in a trapezoidal shape, including a base, a top horizontal plane and an inclined slope; the inclined slope connects the base and the top horizontal plane;

[0007] The slope section system and the top section system are both grid structures, and the grid system is composed of grids and columns, and each grid is vertically fixed by two columns;

[0008] A vertical slope section system is arranged on the inclined slope surface, and a vertical top section system is arranged on the top horizontal surface.

[0009] A further improvement of the present invention is that the grid structure of the slope section system and the top section system is single-layer or multi-layer.

[0010] A further improvement of the present invention is that the porosity of the grid is 10% to 50%, and the bottom edge is fixed on the three-dimensional supporting structure.

[0011] A further improvement of the present invention is that the grille is made of corrosion-resistant metal material.

[0012] A further improvement of the present invention is that the columns are fixed on the three-dimensional supporting structure and are arranged at equal intervals.

[0013] A further improvement of the present invention is that the base is buried in the seabed and fixed.

[0014] A further improvement of the present invention is that the included angle between the inclined slope surface and the horizontal plane is angle α; the range of angle α is 30°-60°.

[0015] A further improvement of the present invention is that one or more layers of offshore wind power pile foundation anti-scour systems are arranged in front of the offshore wind power pile foundation along the dominant flow direction of the seabed water flow.

[0016] A method for preventing scour of an offshore wind power pile foundation comprises the following steps:

[0017] When seawater flows through the slope section system on the inclined slope, part of the sediment in the water is blocked by the grid, and the seawater also flows slower because of climbing the slope and being blocked by the slope section system.

[0018] The seawater flows through the top section system on the top horizontal plane, the sediment in the water is blocked, the seawater is blocked by the top section system, and the flow velocity drops again, reducing the scouring of the pile foundation of offshore wind power by the seawater.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention uses a multi-layer grid structure to slow down the flow rate of water and block the mud and sand near the bottom of the seabed.

[0021] 2. The present invention further increases flow resistance and reduces water flow velocity by setting an inclined slope surface of a three-dimensional support structure.

[0022] 3. The present invention significantly increases the roughness of the seabed and reduces the flow rate of water through the combination of a three-dimensional support structure and a grid structure, thereby achieving the purpose of preventing foundation scour. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of an offshore wind power pile foundation anti-scour system of the present invention.

[0025] 1. Slope section system; 2. Top section system; 3. Grille; 4. Column; 5. Base; 6. Inclined slope; 7. Top horizontal plane. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0027] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0028] In order to make the technical means, creative features, objectives and effects of the present invention clearly understood, the present invention is further described below in conjunction with the accompanying drawings.

[0029] Example 1

[0030] like Figure 1 As shown, an offshore wind power pile foundation anti-scour system of the present invention includes a slope section system 1, a top section system 2 and a three-dimensional support structure.

[0031] The three-dimensional support structure is in a trapezoidal shape, including a base 5, a top horizontal plane 7 and an inclined slope 6; the inclined slope 6 connects the base 5 and the top horizontal plane 7; the base 5 is buried in the seabed and fixed. The angle between the inclined slope 6 and the horizontal plane is angle α; the base 5, the top horizontal plane 7 and the inclined slope 6 together form a three-dimensional support structure. The range of angle α is generally 30°-60°.

[0032] The slope section system 1 and the top section system 2 are both grid structures; the top section system 2 is vertically installed on the top horizontal surface 7, and the slope section system 1 is vertically installed on the inclined slope 6; the grid structure is composed of grids 3 and columns 4, and each grid 3 is vertically fixed by two columns 4.

[0033] The grid structures of the slope section system 1 and the top section system 2 can be single-layer grids or multi-layer grids.

[0034] The grid 3 is made of corrosion-resistant metal material, has a porosity of 10% to 50%, and has a bottom edge fixed on the three-dimensional support structure.

[0035] The upright posts 4 are fixed on the three-dimensional supporting structure and arranged at equal intervals, and play the role of connecting the grid 3 and reinforcing the rigidity of the grid 3 .

[0036] The base 5 of the three-dimensional support structure is buried in the seabed and fixed.

[0037] The dimensions of the three-dimensional support structure, such as the base height, the inclination angle of the inclined slope, the height of the top horizontal plane and the length along the water flow direction, are designed according to parameters such as the seabed water flow speed.

[0038] The pile foundation anti-scour system for offshore wind power can be arranged in one or more layers in front of the underwater foundation of the wind turbine and along the dominant flow direction of the seabed water.

[0039] Example 2

[0040] The present invention also provides a method for preventing scouring of an offshore wind power pile foundation, and an offshore wind power pile foundation anti-scouring system based on embodiment 1 comprises the following steps:

[0041] Step 1: The seawater flows through the slope section system 1 on the inclined slope 6. A part of the sediment in the water is blocked by the grille 3. The seawater also flows slower due to climbing the slope and being blocked by the slope section system 1.

[0042] Step 2: Seawater flows through the top section system 2 on the top horizontal plane 7, the sediment in the water is blocked, and the seawater is blocked by the top section system 2, and the flow rate decreases again to achieve the purpose of preventing scour of the offshore wind power pile foundation.

[0043] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An offshore wind power pile foundation anti-scour system, characterized in that: It comprises a slope section system (1), a top section system (2) and a three-dimensional support structure; The three-dimensional support structure is in a trapezoidal shape, comprising a base (5), a top horizontal plane (7) and an inclined slope (6); the inclined slope (6) connects the base (5) and the top horizontal plane (7); The slope section system (1) and the top section system (2) are both grid structures, and the grid structure is composed of grids (3) and columns (4), and each grid (3) is vertically fixed by two columns (4); A vertical slope section system (1) is provided on the inclined slope surface (6), and a vertical top section system (2) is provided on the top horizontal surface (7); The grid structure of the slope section system (1) and the top section system (2) is single-layer or multi-layer; The grid (3) has a porosity of 10% to 50%, and the bottom edge is fixed on the three-dimensional support structure; The grille (3) is made of corrosion-resistant metal material; The uprights (4) are fixed on the three-dimensional support structure and arranged at equal intervals; The base (5) is buried in the seabed and fixed; The angle between the inclined slope (6) and the horizontal plane is angle α; the range of angle α is 30°-60°; In front of the offshore wind turbine pile foundation, one or more layers of offshore wind turbine pile foundation anti-scour systems are arranged along the dominant flow direction of the seabed water.

2. A method for preventing scour of pile foundation of offshore wind power, characterized in that: An offshore wind power pile foundation anti-scour system according to claim 1 comprises the following steps: The seawater flows through the slope section system (1) on the inclined slope surface (6), and the sediment in the water is partially blocked by the grille (3). The seawater also flows at a reduced speed due to climbing the slope and being blocked by the slope section system. The seawater flows through the top section system (2) on the top horizontal surface (7), the sediment in the water is blocked, the seawater is blocked by the top section system (2), and the flow velocity decreases again, thereby reducing the scouring of the pile foundation of the offshore wind power by the seawater.

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