Anti-scouring device for offshore wind power pile foundation

Abstract

The utility model discloses an offshore wind power pile foundation scour prevention device which comprises a pile foundation, a scour pit around the pile foundation is filled with riprap to form a filling layer, the filling layer is covered with a fixing frame, the fixing frame is arranged on the pile foundation in a sleeved mode, the fixing frame is of a platform body structure, and a plurality of bionic grass is laid on the side wall of the fixing frame. The device is simple in structure, long-term protection in the operation period can be kept, and the later maintenance cost is reduced. The fixing frame can be manufactured on the shore, the weight of the fixing frame is far smaller than that of a traditional sand bag-bionic grass protection device, operation through a large crane is avoided, and the operation amount and cost are saved; the fixing frame can be fixed to an existing riprap filling layer, riprap protection damage is effectively prevented, silt can be deposited to fill riprap gaps, the ocean current speed is reduced, and the protection effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of offshore wind power foundations, and particularly relates to an anti-scouring device for offshore wind power pile foundations. Background Technique

[0002] With the continuous development of the global economy, the energy demand has increased sharply. As a clean and renewable energy form, offshore wind power is gradually becoming an important part of the energy strategies of various countries. However, offshore wind power pile foundations are continuously scoured by seawater in the marine environment for a long time, and their stability and safety face severe challenges. Scouring not only affects the dynamic characteristics and mechanical properties of the pile foundation, but also may lead to structural overturning, seriously threatening the safe operation of wind power facilities.

[0003] In response to the scouring problem of offshore wind power pile foundations, a variety of anti-scouring solutions have been proposed and applied at present. Among them, the riprap technology has been widely used because of its low cost and simple construction. The riprap technology protects the pile foundation by scattering stones on the seabed and using the weight and stability of the stones to resist the scouring of seawater. However, the disadvantages of the riprap technology are also obvious, that is, the stones are easy to loosen or shift under the long-term scouring of seawater, resulting in a gradual weakening of the protection effect, and it is necessary to regularly maintain and supplement the stones, increasing the subsequent maintenance cost. Another anti-scouring solution that has been applied is the bionic grass technology. The bionic grass technology is based on the principle of marine bionics and is made of a new type of polymer material that is resistant to seawater immersion and long-term scouring. By laying the bionic grass structure on the seabed, the water flow velocity is reduced, the scouring intensity is decreased, and sediment deposition is promoted, so as to achieve the purpose of protecting the pile foundation. The advantage of the bionic grass technology lies in its long-term and stable protection effect, which can significantly reduce the impact of scouring on the pile foundation. However, the construction cost of the bionic grass technology is relatively high, and it has high requirements for construction technology and material selection, which to a certain extent limits its wide application. Content of the Utility Model

[0004] In order to make up for the deficiencies of the existing technology, the utility model provides an anti-scouring device for offshore wind power pile foundations, which combines a bionic grass framework with riprap protection to avoid high construction costs and at the same time improve the anti-scouring ability of the riprap.

[0005] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0006] The anti-scouring device for offshore wind power pile foundations includes a pile foundation. The scour pit around the pile foundation is filled with riprap to form a filling layer. A fixed frame is covered on the filling layer. The fixed frame is sleeved on the pile foundation, and the fixed frame is a frustum structure, and a plurality of bionic grasses are laid on its side wall.

[0007] Further, the fixing frame is in the shape of a frustum of a cone, including an upper ring beam, a lower ring beam, and a plurality of connecting rods connecting the upper ring beam and the lower ring beam. The side wall of the fixing frame is divided into a plurality of protection areas by the connecting rods for laying the bionic grass.

[0008] Further, corrosion-resistant gauze is arranged in the protection area, and the bionic grass is arranged on the corrosion-resistant gauze.

[0009] Further, the diameter of the upper ring beam is 1.1 - 1.5 times the diameter of the pile foundation, and the diameter of the lower ring beam is 2 - 3 times the diameter of the pile foundation.

[0010] Further, an assembly ring is arranged in the middle of the upper ring beam for assembling the pile foundation, and reinforcing ribs are arranged between the assembly ring and the upper ring beam.

[0011] Further, the fixing frame is provided with an anti-corrosion coating.

[0012] Further, sacrificial anodes are arranged on the upper ring beam.

[0013] Compared with the prior art, the utility model has the following advantages: The device of the present application has a simple structure, can maintain long-term protection during the operation period, and reduce the later maintenance cost. The fixing frame of the present application can be manufactured on the shore, and its weight is much smaller than that of the traditional sandbag-bionic grass protection device, avoiding the use of large cranes for operation, saving the operation amount and cost; the fixing frame can not only be fixed on the existing riprap filling layer, effectively preventing the damage of the riprap protection, but also deposit sediment to fill the voids of the riprap, reduce the sea current speed, and improve the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the device of the utility model;

[0015] Figure 2 is a top view structural diagram of the device of the utility model;

[0016] Figure 3 is a schematic structural diagram of the fixing frame of the utility model.

[0017] In the figure: 1 - pile foundation, 2 - riprap, 3 - fixing frame, 31 - upper ring beam, 32 - lower ring beam, 33 - connecting rod, 34 - protection area, 35 - corrosion-resistant gauze, 36 - assembly ring, 37 - reinforcing rib, 4 - bionic grass, 5 - sacrificial anode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical means, creative features, achieved purposes and functions of the utility model easy to understand, the utility model will be further described below with reference to the accompanying drawings.

[0019] Such as Figure 1 andFigure 2 As shown in the figure, an anti-erosion device for an offshore wind power pile foundation includes a pile foundation 1. The scour pit around the pile foundation 1 is filled with riprap 2 to form a filling layer. A fixed frame 3 is covered on the filling layer. The fixed frame 3 is sleeved on the pile foundation 1, and the fixed frame 3 is in the shape of a frustum. A number of bionic grasses 4 are laid on its side wall.

[0020] As Figure 3 As shown in the figure, in a specific embodiment, the fixed frame 3 is designed as a frustum structure, including an upper ring beam 31, a lower ring beam 32, and a number of connecting rods 33 connecting the upper ring beam 31 and the lower ring beam 32. The side wall of the fixed frame 3 is divided into a number of protection areas 34 by the connecting rods 33 for laying the bionic grasses 4. Anti-corrosion gauze 35 is arranged in the protection area 34, and the bionic grasses 4 are arranged on the anti-corrosion gauze 35.

[0021] It can be understood that the riprap 2 in the scour pit is laid in a frustum shape, and the fixed frame 3 is laid above the riprap 2. The fixed frame 3 is in the shape of a frustum, which can be pressed on the riprap 3 to prevent the riprap 3 from being eroded and damaged, and at the same time guide the sea current upward. The bionic grasses 4 are arranged on the anti-corrosion gauze 35 on the side of the fixed frame 3, which plays a role in blocking the flow and depositing sediment, filling the gaps of the riprap 2, and strengthening the protection effect.

[0022] In this embodiment, the diameter of the upper ring beam 31 is 1.1 - 1.5 times the diameter of the pile foundation 1, and the diameter of the lower ring beam 32 is 2 - 3 times the diameter of the pile foundation 1. An assembly ring 36 is arranged in the middle of the upper ring beam 31 for assembling the pile foundation 1, and a reinforcing rib 37 is arranged between the assembly ring 36 and the upper ring beam 31.

[0023] In addition, the fixed frame 3 is provided with an anti-corrosion coating, and a sacrificial anode 5 is arranged on the upper ring beam 31 to ensure the protection of the device of the present application during the 20-year operation of the offshore wind power.

[0024] The present application includes riprap 2 and a fixed frame 3 (i.e., a bionic grass frame). The riprap 2 fills the scour pit generated around the pile foundation 1 and fills out a riprap frustum to support the bionic grass frame; the bionic grass frame is arranged on the riprap frustum to fix the riprap protection, prevent the riprap from causing secondary erosion, and accumulate sediment to form a long-term protection effect. The fixed frame 3 of the present application can also adopt a prism frustum structure, and the corresponding riprap 2 should be piled up into a corresponding prism frustum shape to support the fixed frame 3 of the prism frustum structure. Anti-corrosion gauze 35 is arranged on the side wall of the prism frustum to lay the bionic grasses 4.

[0025] 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 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 on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-erosion device for an offshore wind power pile foundation, comprising a pile foundation (1), characterized in that, The scour pit around the pile foundation (1) is filled with riprap (2) to form a filling layer, and a fixing frame (3) is covered on the filling layer. The fixing frame (3) is sleeved on the pile foundation (1), and the fixing frame (3) is a frustum structure, and a plurality of bionic grasses (4) are laid on its side wall.

2. The anti-scouring device for an offshore wind power pile foundation according to claim 1, characterized in that, The fixing frame (3) is a circular frustum structure, including an upper ring beam (31), a lower ring beam (32), and a plurality of connecting rods (33) connecting the upper ring beam (31) and the lower ring beam (32). The side wall of the fixing frame (3) is divided into a plurality of protection areas (34) by the connecting rods (33) for laying the bionic grasses (4).

3. The anti-scouring device for an offshore wind power pile foundation according to claim 2, characterized in that An anti-corrosion gauze (35) is arranged in the protection area (34), and the bionic grass (4) is arranged on the anti-corrosion gauze (35).

4. The anti-scouring device for an offshore wind power pile foundation according to claim 2, wherein, The diameter of the upper ring beam (31) is 1.1 to 1.5 times the diameter of the pile foundation (1), and the diameter of the lower ring beam (32) is 2 to 3 times the diameter of the pile foundation (1).

5. The anti-erosion device for an offshore wind power pile foundation according to claim 4, characterized in that, An assembly ring (36) is arranged in the middle of the upper ring beam (31) for assembling the pile foundation (1), and a reinforcing rib (37) is arranged between the assembly ring (36) and the upper ring beam (31).

6. A scour prevention device for an offshore wind power pile foundation according to any one of claims 1-5, characterized in that, The fixing frame (3) is provided with an anti-corrosion coating.

7. An anti-scouring device for an offshore wind power pile foundation according to any one of claims 2-5, characterized in that, A sacrificial anode (5) is arranged on the upper ring beam (31).

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