Single-pile foundation scour-preventing structure and construction method

Abstract

The present application relates to offshore wind power single pile foundation scour prevention, wind energy engineering, new energy field, disclose a kind of single pile foundation scour prevention structure and construction method, including single pile foundation, several pieces of assembled scour prevention apron, several ropes and stone block unit;The bottom of the single pile foundation is arranged at the seabed, several guide assemblies are circumferentially annularly distributed around the single pile foundation, several ropes are respectively correspondingly inserted into the guide assembly along the top to the bottom of the single pile foundation, several ropes are respectively connected with several pieces of the assembled scour prevention apron at the bottom of the single pile foundation, several ropes drive several pieces of the assembled scour prevention apron to the seabed near the bottom of single pile foundation in sequence through the guide assembly, the stone block unit is pressed on the assembled scour prevention apron, improve the self gravity of assembled scour prevention apron, improve the scour protection effect of single pile foundation.

Description

Technical Field

[0001] This invention relates to scour protection of monopile foundations for offshore wind power, wind energy engineering, and new energy fields, specifically to a monopile foundation scour protection structure and construction method. Background Technology

[0002] Compared to traditional fossil fuels, wind energy is cleaner, less expensive, and has advantages such as wide development potential, safety, and inexhaustible energy resources. Compared to onshore wind power, offshore wind power has advantages such as higher wind speeds, lower turbulence, and no need to occupy arable land. Currently, most offshore wind turbine foundations use monopile foundations, which are simple to design and have mature installation technology.

[0003] However, some sea areas still suffer from severe scouring of single-pile foundations, with the deepest scour pits reaching half the depth of the pile embedded in the mud, seriously threatening the safe operation of the foundation. Scour protection projects are time-consuming and labor-intensive, and how to effectively carry out scour protection after construction has become an urgent problem to be solved in the industry. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the purpose of this invention is to provide a monopile foundation anti-scour structure and construction method to solve the technical problem of how to effectively protect against scour in the prior art.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a monopile foundation anti-scour structure, comprising a monopile foundation, several prefabricated anti-scour cover plates, several cables, and stone blocks.

[0007] The bottom of the monopile foundation is located at the seabed. Several guide components are distributed circumferentially around the monopile foundation. Several cables pass through the guide components from the top to the bottom of the monopile foundation. Several cables are connected to several prefabricated anti-scour cover plates at the bottom of the monopile foundation. Several cables drive several prefabricated anti-scour cover plates towards the seabed at the bottom of the monopile foundation in sequence through the guide components. The stone unit is pressed onto the prefabricated anti-scour cover plate.

[0008] Preferably, the guide assembly includes a lower cable guide hole and an upper cable guide hole. The lower cable guide hole is located at the bottom of the monopile foundation, and the upper cable guide hole is located at the top of the monopile foundation. The cable extends through the upper cable guide hole to the lower cable guide hole and connects with the prefabricated anti-collision cover plate.

[0009] Furthermore, the positions of the lower cable guide hole and the upper cable guide hole correspond vertically along the monopile foundation.

[0010] Preferably, the prefabricated anti-collision cover has a fan-shaped structure, wherein the side of the prefabricated anti-collision cover closest to the monopile foundation is the inner arc surface, and the side of the prefabricated anti-collision cover away from the monopile foundation is the outer arc surface; the two ends of the inner arc surface of the prefabricated anti-collision cover are respectively connected to the ends of the cable, and the outer arc surface of the prefabricated anti-collision cover is the free end.

[0011] Furthermore, the inner arc surface of the assembled anti-impact cover plate is provided with cover plate anchor points at both ends, and the end of the cable is connected to the cover plate anchor points.

[0012] Furthermore, the inner arc surfaces of several of the assembled anti-collision cover plates are connected by the cables to form circular rings that surround the periphery of the monopile foundation.

[0013] Furthermore, the surface of the assembled anti-impact cover is a flexible mesh belt structure.

[0014] Furthermore, the stone unit comprises a plurality of stones, the volume of which is larger than the mesh size of the flexible mesh belt structure.

[0015] Secondly, the present invention provides a construction method for a monopile foundation scour protection structure, based on the above-mentioned monopile foundation scour protection structure, comprising the following processes:

[0016] After the cable passes through the guide assembly of the monopile foundation, it is connected to the prefabricated anti-scour cover. By pulling the cable, the prefabricated anti-scour cover is brought close to the seabed at the bottom of the monopile foundation. When the prefabricated anti-scour cover reaches the designated position, the installation of one prefabricated anti-scour cover is completed. The installation of the remaining prefabricated anti-scour covers is repeated in sequence. After all the prefabricated anti-scour covers are surrounded at the bottom of the monopile foundation at the seabed, the stone unit is thrown into the seabed and pressed on the prefabricated anti-scour cover, thus completing the anti-scour operation of the monopile foundation.

[0017] Preferably, the edge material of the assembled anti-impact cover is made of steel.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention provides a scour protection structure for monopile foundations. By sequentially passing cables through the guide assembly of the monopile foundation and connecting them to prefabricated scour protection covers, the guide assembly sequentially moves several prefabricated scour protection covers close to the seabed bottom of the monopile foundation. This effectively controls the underwater protection range at the bottom of the monopile foundation. Furthermore, by pressing stone units onto the prefabricated scour protection covers, the self-weight of the prefabricated scour protection covers is increased, thereby improving the scour protection effect on the monopile foundation.

[0020] Furthermore, the guide component includes a lower cable guide hole and an upper cable guide hole. The cable passes through the upper cable guide hole and the lower cable guide hole in sequence and then connects to the prefabricated anti-scour cover plate. This can effectively drive the prefabricated anti-scour cover plate closer to the bottom of the monopile foundation, making it easier for the prefabricated anti-scour cover plate to protect the bottom of the monopile foundation from scouring.

[0021] Furthermore, the positions of the lower and upper cable guide holes correspond vertically on the monopile foundation, which can effectively save manpower and facilitate the pulling of the prefabricated anti-erection cover plate towards the bottom of the monopile foundation by cable.

[0022] Furthermore, the prefabricated anti-collision cover has a fan-shaped structure, with the side of the prefabricated anti-collision cover closer to the monopile foundation being the inner arc surface and the side of the prefabricated anti-collision cover farther from the monopile foundation being the outer arc surface; the two ends of the inner arc surface of the prefabricated anti-collision cover are respectively connected to the ends of the cable, and the outer arc surface of the prefabricated anti-collision cover is the free end, which can precisely control the underwater protection range and avoid the overlap of the prefabricated anti-collision covers.

[0023] Furthermore, the prefabricated anti-impact cover has a flexible mesh belt structure, which can minimize the weight of the cover and save on offshore lifting resources.

[0024] Furthermore, the stone unit includes several stones, the volume of which is larger than the mesh size of the flexible mesh structure, increasing the self-weight of the prefabricated anti-scour cover and improving the stability of the monopile foundation against scour.

[0025] A construction method for a monopile foundation scour protection structure is described. The process is simple: first, prefabricated scour protection covers are pulled close to the bottom of the monopile foundation seabed by several cables; then, stone units are thrown into the seabed and pressed onto the prefabricated scour protection covers, thus completing the monopile foundation scour protection operation and improving the scour protection effect of the monopile foundation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the longitudinal section of the structure in this invention;

[0027] Figure 2 This is a top view of the stone-throwing process in this invention.

[0028] Figure 3 This is a top view of the stone after it has been thrown in this invention;

[0029] Figure 4 This is a flowchart of the construction process in this invention;

[0030] In the diagram: 1. Monopile foundation; 11. Lower cable guide hole; 12. Upper cable guide hole; 2. Prefabricated anti-impact cover plate; 21. Cover plate anchor point; 211. Cable; 22. Flexible mesh belt structure. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] The purpose of this invention is to provide a monopile foundation anti-scour structure and construction method to solve the technical problem of how to effectively protect against scour in the prior art.

[0034] Example 1

[0035] See Figure 1 In one embodiment of the present invention, a monopile foundation anti-scour structure is provided, including a monopile foundation 1, several prefabricated anti-scour cover plates 2, several cables 211 and stone blocks.

[0036] The bottom of the monopile foundation 1 is located at the seabed. Several guide components are distributed circumferentially around the monopile foundation 1. Several cables 211 are threaded through the guide components from top to bottom of the monopile foundation 1. The cables 211 are connected to several prefabricated anti-scour covers 2 at the bottom of the monopile foundation 1. The cables 211, through the guide components, sequentially drive the prefabricated anti-scour covers 2 towards the seabed at the bottom of the monopile foundation 1. Figure 2 As shown; the stone unit is pressed onto the prefabricated anti-impact cover plate 2, as... Figure 3 As shown.

[0037] Specifically, the guide assembly includes a lower cable guide hole 11 and an upper cable guide hole 12. The lower cable guide hole 11 is located at the bottom of the monopile foundation 1, and the upper cable guide hole 12 is located at the top of the monopile foundation 1. The cable 211 extends through the upper cable guide hole 12 to the lower cable guide hole 11 and connects with the prefabricated anti-impact cover plate 2.

[0038] Among them, the cable 211 passes through the upper cable guide hole 12 and the lower cable guide hole 11 in sequence and is connected to the prefabricated anti-scour cover plate 2. It can effectively drive the prefabricated anti-scour cover plate 2 closer to the bottom of the monopile foundation 1, so that the prefabricated anti-scour cover plate 2 can protect the bottom of the monopile foundation 1 from scouring.

[0039] Specifically, the lower cable guide hole 11 and the upper cable guide hole 12 are located vertically opposite each other on the monopile foundation 1.

[0040] The lower cable guide hole 11 and the upper cable guide hole 12 are positioned vertically, which can effectively save manpower and facilitate the use of cables to pull the prefabricated anti-collision cover plate closer to the bottom of the monopile foundation.

[0041] Specifically, the prefabricated anti-collision cover 2 has a fan-shaped structure, wherein the side of the prefabricated anti-collision cover 2 closest to the monopile foundation 1 is the inner arc surface, and the side of the prefabricated anti-collision cover 2 away from the monopile foundation 1 is the outer arc surface; the two ends of the inner arc surface of the prefabricated anti-collision cover 2 are respectively connected to the ends of the cable 211, and the outer arc surface of the prefabricated anti-collision cover 2 is the free end.

[0042] Among them, the prefabricated anti-impact cover 2 can precisely control the underwater protection range and avoid the overlap of prefabricated anti-impact covers.

[0043] Specifically, the inner arc surface of the assembled anti-impact cover plate 2 is provided with cover plate anchor points 21 at both ends, and the end of the cable 211 is connected to the cover plate anchor points 21.

[0044] Specifically, the inner arc surfaces of several of the prefabricated anti-collision cover plates 2 are connected by the cable 211 to form a circular ring that surrounds the periphery of the monopile foundation 1.

[0045] Specifically, the prefabricated anti-impact cover 2 has a flexible mesh belt structure 22 on its surface, which can reduce the weight of the cover to the greatest extent and save marine lifting resources.

[0046] Specifically, the stone unit includes several stones, and the volume of several of the stones is larger than the mesh size of the flexible mesh structure 22.

[0047] When the stone blocks are pressed onto the flexible mesh structure, the weight of the prefabricated anti-scour cover plate is increased, which improves the stability of the monopile foundation against scour.

[0048] In summary, this embodiment provides a monopile foundation scour protection structure. By sequentially passing cables through the guide assembly of the monopile foundation and connecting them to prefabricated scour protection covers, the guide assembly sequentially moves several prefabricated scour protection covers close to the seabed at the bottom of the monopile foundation. This effectively controls the underwater protection range at the bottom of the monopile foundation. Furthermore, by pressing stone units onto the prefabricated scour protection covers, the self-weight of the prefabricated scour protection covers is increased, thereby improving the scour protection effect on the monopile foundation.

[0049] Example 2

[0050] See Figure 4 In one embodiment of the present invention, a construction method for a monopile foundation scour protection structure is provided, which, based on the above-described monopile foundation scour protection structure, includes the following process:

[0051] After the cable 211 is passed through the guide assembly of the monopile foundation 1, it is connected to the prefabricated anti-scour cover 2. By pulling the cable 211, the prefabricated anti-scour cover 2 is moved closer to the seabed at the bottom of the monopile foundation 1. When the prefabricated anti-scour cover 2 reaches the designated position, the installation of one prefabricated anti-scour cover 2 is completed. Figure 4 As shown in (a); repeat the installation of the remaining assembled anti-impact cover plates 2 in sequence, as shown in (a). Figure 4 As shown in (b) and (c), after all the prefabricated scour protection covers 2 are surrounded at the bottom of the monopile foundation 1 at the seabed, the stone blocks are thrown into the seabed and pressed onto the prefabricated scour protection covers 2, as shown in (b) and (c). Figure 4 As shown in (d), the scour prevention work for the single pile foundation is completed.

[0052] In this embodiment, the edge material of the prefabricated anti-scour cover 2 is made of steel, which increases the self-weight of the prefabricated anti-scour cover and improves the stability of the monopile foundation against scour.

[0053] In summary, this embodiment provides a construction method for a monopile foundation scour protection structure. The process is simple: first, the prefabricated scour protection cover plate is pulled close to the bottom of the monopile foundation seabed by several cables; then, stone blocks are thrown into the seabed and pressed onto the prefabricated scour protection cover plate to complete the monopile foundation scour protection operation and improve the scour protection effect of the monopile foundation.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A scour-resistant structure for a single-pile foundation, characterized in that, It includes a single pile foundation (1), several prefabricated anti-scour cover plates (2), several cables (211), and stone blocks; The bottom of the monopile foundation (1) is located at the seabed. Several guide components are distributed in a circumferential ring around the monopile foundation (1). Several cables (211) pass through the guide components from the top to the bottom of the monopile foundation (1). Several cables (211) are connected to several prefabricated anti-shovel cover plates (2) at the bottom of the monopile foundation (1). Several cables (211) drive several prefabricated anti-shovel cover plates (2) to approach the bottom of the monopile foundation (1) at the seabed through the guide components. The stone unit is pressed on the prefabricated anti-shovel cover plate (2). The guide assembly includes a lower cable guide hole (11) and an upper cable guide hole (12). The lower cable guide hole (11) is located at the bottom of the monopile foundation (1), and the upper cable guide hole (12) is located at the top of the monopile foundation (1). The cable (211) extends through the upper cable guide hole (12) to the lower cable guide hole (11) and connects with the prefabricated anti-impact cover plate (2). The prefabricated anti-collision cover (2) has a fan-shaped structure. The side of the prefabricated anti-collision cover (2) closest to the monopile foundation (1) is the inner arc surface, and the side of the prefabricated anti-collision cover (2) away from the monopile foundation (1) is the outer arc surface. The two ends of the inner arc surface of the prefabricated anti-collision cover (2) are respectively connected to the ends of the cable (211), and the outer arc surface of the prefabricated anti-collision cover (2) is the free end.

2. The scour prevention structure for a single pile foundation according to claim 1, characterized in that, The lower cable guide hole (11) and the upper cable guide hole (12) are located vertically on the monopile foundation (1).

3. The scour prevention structure for a single pile foundation according to claim 1, characterized in that, The inner arc surface of the assembled anti-impact cover plate (2) is provided with cover plate anchor points (21) at both ends, and the end of the cable (211) is connected to the cover plate anchor point (21).

4. The scour prevention structure for a single pile foundation according to claim 3, characterized in that, The inner arc surfaces of several of the assembled anti-collision cover plates (2) are connected by the cable (211) to form a circular ring that surrounds the periphery of the monopile foundation (1).

5. The scour prevention structure for a single pile foundation according to claim 1, characterized in that, The surface of the assembled anti-impact cover (2) is a flexible mesh belt structure (22).

6. The scour prevention structure for a single pile foundation according to claim 5, characterized in that, The stone unit includes several stones, and the volume of several of the stones is larger than the mesh size of the flexible mesh structure (22).

7. A construction method for a monopile foundation scour protection structure, based on the monopile foundation scour protection structure according to any one of claims 1-6, characterized in that, The process includes the following: After the cable (211) is passed through the guide assembly of the monopile foundation (1), it is connected to the prefabricated anti-scour cover plate (2). By pulling the cable (211), the prefabricated anti-scour cover plate (2) is brought close to the bottom seabed of the monopile foundation (1). When the prefabricated anti-scour cover plate (2) reaches the designated position, the installation of one prefabricated anti-scour cover plate (2) is completed. The installation of the remaining prefabricated anti-scour cover plates (2) is repeated in sequence. When all the prefabricated anti-scour cover plates (2) are surrounded at the bottom seabed of the monopile foundation (1), the stone unit is thrown into the seabed and pressed on the prefabricated anti-scour cover plate (2) to complete the anti-scour operation of the monopile foundation.

8. The construction method of a single-pile foundation scour prevention structure according to claim 7, characterized in that, The edge material of the assembled anti-impact cover (2) is made of steel.

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