A protection device for preventing scouring of a pile foundation

Abstract

The application discloses a protection device for preventing pile foundation scouring and relates to the technical field of offshore wind power, which comprises reinforced meshes, the reinforced meshes are multiple, each reinforced mesh is sequentially connected to form a reinforced net structure, the reinforced net structure is arranged on a seabed around a pile foundation and is used for fixing the seabed, a filler reinforcing area is formed in the reinforced mesh, the filler reinforcing area is filled with a filler to reinforce the seabed, and a grid net for hindering silt loss is arranged in the filler reinforcing area. The protection device for preventing pile foundation scouring is arranged on the seabed around the pile foundation through the reinforced net structure formed by sequentially connecting multiple reinforced meshes, and the filler and the grid net in the filler reinforcing area can reinforce the seabed and prevent silt loss. Since the protection device reinforces the seabed around the foundation and is not affected by the structure form of the pile foundation, the applicability of the pile foundation protection device is improved.

Description

A protective device for preventing scour of pile foundations Technical Field

[0001] This invention relates to the field of offshore wind power technology, and more specifically, to a protective device for preventing scour of pile foundations. Background Technology

[0002] In the construction of offshore wind farms, the safety and stability of the offshore wind power foundation are particularly important. The presence of marine structures significantly alters the flow field around the structure, creating a complex and variable three-dimensional flow pattern. Downflow and horseshoe vortices appear in front of the pile foundation, streamlines contract along the direction of water flow on the sides of the pile foundation, and tail vortices are continuously generated and detached behind the pile foundation. Under the combined action of the flow vortex structure and flow characteristics, the shear force on the seabed surface increases, thereby enhancing the transport capacity of the seabed bed. The continuous detachment of the tail vortex carries some sediment and transports it downstream, eventually forming obvious local scour pits around the structure. The formation of scour pits reduces the pile foundation burial depth and increases the eccentricity of the horizontal load, thus weakening the horizontal bearing capacity of the pile foundation. Therefore, improving the safety protection capability of the pile foundation is crucial for the construction of wind farms.

[0003] In existing technologies, most scour protection measures adopt passive protection methods, such as permeable protective frames, protection by throwing concrete blocks at the four corners, protection by throwing stones and then grouting, protection by pouring concrete membrane bags, protection by expanding the foundation and setting up an exposed foundation bed, and protection by throwing stones. However, these methods are mainly for single pile foundations. Since the structure of pile group foundations is more complex, such as jacket foundations, their scour characteristics are also very complex, making it difficult to apply scour protection measures for single pile foundations to pile group foundations.

[0004] In addition, as research on scour prevention at the bottom of piles has gradually been carried out, active protection measures have also been proposed. These measures generally include setting up protective rings to reduce scour, opening gaps to reduce scour, setting up diversion screens to reduce scour, setting up stone slabs downstream to reduce scour, setting up abutments to reduce scour, and setting up rows of piles in front of the pier to reduce scour, but these measures are only for single pile foundations.

[0005] Therefore, how to improve the applicability of pile foundation protection devices has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a protective device for preventing pile foundation erosion, so as to improve the applicability of pile foundation protection devices.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A protective device for preventing scour of pile foundations, comprising:

[0009] The reinforcement grid consists of multiple grids connected sequentially to form a reinforced mesh structure. This reinforced mesh structure is installed on the seabed around the pile foundation to stabilize the seabed. A filler reinforcement zone is formed within each reinforcement grid, and the filler reinforcement zone is filled with filler material to reinforce the seabed. A grid mesh is installed within the filler reinforcement zone to prevent sediment loss.

[0010] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, the reinforcing mesh is provided with an energy-dissipating structure for reducing the kinetic energy of the seawater at the bottom of the seabed.

[0011] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, the energy-dissipating structure is a protrusion provided on the reinforcing mesh.

[0012] Optionally, in the above-mentioned protective device for preventing pile foundation scour, the energy-dissipating structure is a sand-patterned structure, and the sand-patterned structure and the reinforcing mesh are integrally formed.

[0013] Optionally, in the above-mentioned protective device for preventing pile foundation scour, the reinforcing mesh is made of concrete, adjacent reinforcing meshes are connected by connectors, and the side of the reinforcing mesh is provided with connection holes to facilitate the connection of the connectors.

[0014] Optionally, in the above-mentioned protective device for preventing pile foundation scour, the number of connecting holes on the side of the reinforcing mesh is not less than four; and / or,

[0015] The connector is a flexible component.

[0016] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, the diameter of the pile foundation is D, the height of the reinforcing mesh is not less than 0.04D, and the thickness of the reinforcing mesh is not less than 100mm.

[0017] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, the reinforcing mesh structure is laid within a range of not less than 5D around the pile foundation, and the seabed within a range of 0.5D to 1D around the reinforcing mesh structure is cured by a curing agent.

[0018] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, there are multiple filler reinforcement zones, and each filler reinforcement zone is distributed in a matrix. The filler in the filler reinforcement zone is silt, and the silt and the reinforcing mesh are connected by curing agent.

[0019] Optionally, in the above-mentioned protective device for preventing pile foundation erosion, the grid mesh is a mesh structure formed by interlaced steel wires, the diameter of the steel wires is not less than 10mm, and the grid mesh is embedded in the filler reinforcement area.

[0020] The protective device for preventing pile foundation erosion provided by this invention consists of multiple reinforcing meshes connected sequentially to form a reinforced mesh structure. This reinforced mesh structure is placed on the seabed around the pile foundation to stabilize the seabed and prevent sediment loss. Simultaneously, a filler reinforcement zone is formed within each reinforcing mesh, which can be filled with filler material to reinforce the seabed. Furthermore, a grid mesh is installed within the filler reinforcement zone to effectively prevent the filler material and sediment in the filler reinforcement zone from being washed away by seawater, thereby preventing erosion of the seabed near the pile foundation and providing a good protective effect for the pile foundation.

[0021] Compared with the prior art, the protective device for preventing pile foundation erosion provided by the present invention sets up a reinforced mesh structure composed of multiple reinforcing grids connected in sequence on the seabed around the pile foundation, thereby fixing the seabed around the pile foundation. At the same time, a filler reinforcement zone is formed within each reinforcing grid. Through the filler and grid mesh in the filler reinforcement zone, the seabed can be effectively reinforced and sediment loss can be prevented, thereby preventing the seabed near the pile foundation from being eroded and providing a good protective effect for the pile foundation. Since the protective device reinforces the seabed around the foundation, it is not affected by the structural form of the pile foundation, thus improving the applicability of the pile foundation protection device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 is a schematic diagram of the protective device provided in an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the arrangement of the protective device provided in an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the reinforced mesh structure provided in Embodiment 1 of the present invention;

[0026] Figure 4 is an axonometric view of the reinforced mesh provided in Embodiment 2 of the present invention;

[0027] Figure 5 is a top view of the reinforced mesh provided in Embodiment 2 of the present invention;

[0028] Figure 6 is a side view of the reinforced mesh provided in Embodiment 2 of the present invention;

[0029] Figure 7 is an axonometric view of the reinforced mesh provided in Embodiment 3 of the present invention;

[0030] Figure 8 is a top view of the reinforced mesh provided in Embodiment 3 of the present invention;

[0031] Figure 9 is a side view of the reinforced mesh provided in Embodiment 3 of the present invention.

[0032] Among them, 100 is the reinforcing mesh, 101 is the filler reinforcement area, 102 is the grid mesh, 103 is the connector, and 104 is the connection hole;

[0033] 200 is an energy-consuming structure, 201 is a protrusion, and 202 is a sand-textured structure.

[0034] 300 is for pile foundation;

[0035] 400 represents the seabed. Detailed Implementation

[0036] The core of this invention is to provide a protective device for preventing pile foundation erosion, thereby improving the applicability of pile foundation protection devices.

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] As shown in Figure 1, this embodiment of the invention discloses a protective device for preventing scour of pile foundations, including a reinforcing mesh 100. It should be noted that in the prior art, most scour protection measures employ passive methods, such as permeable protective frames, throwing concrete blocks at the four corners, throwing stones followed by grouting, pouring concrete membrane bags, expanding the foundation to create an exposed foundation bed, and throwing stones. However, these methods are mainly for single pile foundations. Due to the complex structure of pile group foundations, such as jacket foundations, their scour characteristics are also very complex, making it difficult to apply scour prevention measures for single pile foundations to pile group foundations. Furthermore, with the increasing research on scour prevention at the bottom of pile columns, active protection measures have also been proposed. These generally include setting up protective rings to reduce scour, self-splitting to reduce scour, setting up diversion screens to reduce scour, setting up stone slabs downstream to reduce scour, using abutments to reduce scour, and setting up rows of piles in front of the pier to reduce scour, but these are only applicable to single pile foundations. The protective device for preventing scour of pile foundations disclosed in this invention is formed by connecting multiple reinforcing meshes 100 in sequence to create a reinforced mesh structure on the seabed 400 surrounding the pile foundation 300, thereby fixing the seabed 400 around the pile foundation 300. Simultaneously, a filler reinforcement zone 101 is formed within each reinforcing mesh 100. Through the filler material and the grid mesh 102 within the filler reinforcement zone 101, the seabed 400 is effectively reinforced and sediment loss is prevented, thus preventing scour of the seabed 400 near the pile foundation 300 and providing good protection for the pile foundation 300. Since the protective device reinforces the seabed 400 around the foundation, it is not affected by the structural form of the pile foundation 300, thereby improving the applicability of the pile foundation 300 protective device.

[0039] As shown in Figures 1 and 3, there are multiple reinforcing grids 100, and each reinforcing grid 100 is connected in sequence to form a reinforced mesh structure. The reinforced mesh structure is set on the seabed 400 around the pile foundation 300 to fix the seabed 400 and prevent the seabed 400 from being eroded by seawater. A filler reinforcement zone 101 is formed within the reinforcing grid 100. By filling the filler reinforcement zone 101 with filler material, the seabed 400 is reinforced. At the same time, a grid mesh 102 is set in the filler reinforcement zone 101, which can effectively prevent the filler material and silt in the filler reinforcement zone 101 from being washed away by seawater, thereby preventing the seabed 400 near the pile foundation 300 from being eroded, and providing a good protective effect for the pile foundation 300.

[0040] Specifically, as shown in Figure 1, the reinforcing mesh 100 adopts a concrete structure. Adjacent reinforcing meshes 100 are connected by connectors 103, and the sides of the reinforcing mesh 100 are provided with connection holes 104 to facilitate connection by the connectors 103. The number of connection holes 104 on the sides of the reinforcing mesh 100 is no less than four, thereby ensuring the connection strength between adjacent reinforcing meshes 100 and preventing them from separating due to seawater erosion. Meanwhile, the connectors 103 are flexible components such as cables or chains, ensuring both connection strength and flexibility. As shown in Figure 2, the reinforcing mesh 100 can change its size according to the topography of the seabed 400 and the structural characteristics of the pile foundation 300, and can be flexibly connected by connectors 103. Because the connectors 103 are flexible, the reinforcing mesh 100 can adapt to different seabed topography, thus improving the applicability of the pile foundation 300 protection device while providing protection for the pile foundation 300.

[0041] The protective device for preventing pile foundation erosion disclosed in this invention consists of multiple reinforcing meshes 100 connected sequentially to form a reinforced mesh structure. This reinforced mesh structure is placed on the seabed 400 surrounding the pile foundation 300 to fix the seabed 400 around the pile foundation 300 and prevent sediment loss. Simultaneously, a filler reinforcement zone 101 is formed within each reinforcing mesh 100, which can be filled with filler material to reinforce the seabed 400. Furthermore, a grid mesh 102 is installed within the filler reinforcement zone 101, effectively preventing the filler material and sediment within the filler reinforcement zone 101 from being washed away by seawater. This prevents the seabed 400 near the pile foundation 300 from being eroded, thus providing a good protective effect for the pile foundation 300.

[0042] Compared with the prior art, the protective device for preventing pile foundation erosion disclosed in this invention sets up a reinforced mesh structure composed of multiple reinforcing grids 100 connected in sequence on the seabed 400 around the pile foundation 300, thereby fixing the seabed 400 around the pile foundation 300. At the same time, a filler reinforcement zone 101 is formed in each reinforcing grid 100. Through the filler in the filler reinforcement zone 101 and the grid 102, the seabed 400 can be effectively reinforced and silt loss can be prevented, thereby preventing the seabed 400 near the pile foundation 300 from being eroded. It has a good protective effect on the pile foundation 300. Since the protective device reinforces the seabed 400 around the foundation, it is not affected by the structural form of the pile foundation 300, thus improving the applicability of the pile foundation 300 protective device. Moreover, the protective device has a simple structure, strong operability, is easy to construct, and has low cost.

[0043] Furthermore, as shown in Figure 2, to improve the strength of the protective device and the effectiveness of preventing seawater erosion of the seabed 400, in a specific embodiment, the diameter of the pile foundation 300 is defined as D, the height of the reinforcing mesh 100 is not less than 0.04D, and the thickness of the reinforcing mesh 100 is not less than 100mm. This ensures that the protective device has sufficient strength to resist the erosion of seawater, extends the service life of the protective device, and reduces maintenance costs. Simultaneously, a reinforced mesh structure formed by connecting the various reinforcing meshes 100 through connectors 103 is laid around the pile foundation 300 within an area of ​​not less than 5D to ensure a larger area of ​​reinforced seabed 400, thereby more effectively reducing the erosion of the seabed 400 by seawater and providing better protection for the pile foundation 300. Those skilled in the art will understand that the larger the area covered by the reinforced mesh structure, the more significant its effect in reducing the scouring of the seabed 400 by seawater, and the higher the cost; conversely, the smaller the area covered by the reinforced mesh structure, the weaker its effect in reducing the scouring of the seabed 400 by seawater, and the lower the cost. According to experimental data and calculation results, the best effect in reducing the scouring of the seabed 400 by seawater is achieved when the reinforced mesh structure is laid within a range of not less than 5D around the pile foundation 300. At the same time, within a range of 0.5D to 1D around the reinforced mesh structure (i.e., the range shown by L in Figure 2), the seabed 400 is solidified with a solidifying agent to solidify the mud and silt, thereby improving the stability of the reinforced mesh structure and preventing it from moving when the seawater scours the seabed 400, thus affecting the effect of solidifying the seabed 400. It should be noted that the curing agent can be a traditional silt curing agent, which can improve the density and flexibility of the seabed 400. After adding the silt curing agent, the ionic state of the mud and silt particles on the surface of the seabed 400 is changed, thereby changing the mud and silt from hydrophilic to hydrophobic, sealing the capillaries of the mud and silt, making it difficult for water to penetrate after compaction, thus improving the stability of the seabed 400.

[0044] Furthermore, there are multiple reinforced areas 101, and each reinforced area 101 is distributed in a matrix. The filler material in the reinforced area 101 is silt. The silt and the reinforcing mesh 100 are solidified and connected by a curing agent, thereby improving the effect of fixing the seabed 400. At the same time, the grid mesh 102, which is formed by interlaced steel wires, is embedded in the reinforced area 101, which can play a good role in fixing the filler material and effectively prevent the loss of silt under the scouring action of seawater, thereby improving the overall stability of the reinforcing mesh 100. In order to ensure that the grid mesh 102 has sufficient strength, the diameter of the steel wire is not less than 10mm, thereby increasing the compressive strength and tensile strength of the grid mesh 102, enabling it to resist the frictional force generated by silt, improving the durability of the grid mesh 102, and further reducing the maintenance cost of the protective device. It should be noted that there can also be a single reinforced area 101. When there is a single reinforced area 101, it is similar to the above embodiment, and will not be described again here.

[0045] Furthermore, as shown in Figures 4 to 9, an energy-dissipating structure 200 is provided on the reinforcing grid 100. The energy-dissipating structure 200 provided on the reinforcing grid 100 can reduce the kinetic energy of the seawater at the bottom of the seabed 400, thereby reducing the scouring effect of the seawater on the seabed 400.

[0046] As shown in Figures 4 to 6, in one specific embodiment, the energy-dissipating structure 200 is a protrusion 201 disposed on the reinforcing mesh 100, and the protrusion 201 is located on both sides of the filler reinforcement area 101. When seawater flows through the protrusions 201 on both sides of the filler reinforcement area 101, it collides with the protrusions 201 to dissipate the kinetic energy of the seawater. At the same time, even if the seawater carries away some of the silt in the filler reinforcement area 101, since the filler reinforcement area 101 is located between adjacent protrusions 201, the silt will be subject to gravity when the seawater collides with the protrusions 201, and will sink back into the filler reinforcement area 101, thus preventing it from being washed away by the seawater, thereby ensuring the stability of the protective device.

[0047] As shown in Figures 7 to 9, in another specific embodiment, the energy-dissipating structure 200 can adopt a sand-patterned structure 202, and the sand-patterned structure 202 and the reinforcing mesh 100 are integrally formed. At the same time, the filling reinforcement area 101 is arranged in a matrix on the sand-patterned structure 202. By setting the grid mesh 102 and filling the solidified silt in the filling reinforcement area 101, the seabed is reinforced. Furthermore, the sand-patterned structure 202 can dissipate the kinetic energy of the seawater, reduce the scouring effect of the seawater, and provide a better protection effect for the pile foundation 300.

[0048] The protective device for preventing scour of pile foundations disclosed in this invention involves setting a reinforced mesh structure, consisting of multiple reinforcing grids 100 connected in sequence, on the seabed 400 surrounding the pile foundation 300. This provides fixation to the seabed 400. Simultaneously, energy-dissipating structures 200 are installed on the reinforcing grids 100, which reduce the kinetic energy of the seawater at the bottom of the seabed 400, thereby reducing the scouring effect of the seawater and effectively protecting the pile foundation 300. Since the protective device reinforces the seabed 400 around the foundation, it is unaffected by the structural form of the pile foundation 300, thus improving the applicability of the pile foundation protection device. Furthermore, the device has a simple structure, is highly operable, easy to construct, and has a low cost.

[0049] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protective device for preventing scour of pile foundations, characterized in that, include: A reinforced mesh (100) is provided, comprising multiple reinforced meshes (100) connected sequentially to form a reinforced mesh structure. This reinforced mesh structure is installed on the seabed (400) surrounding the pile foundation (300) to fix the seabed (400). A filler reinforcement zone (101) is formed within each reinforced mesh (100), filled with filler material to reinforce the seabed (400). A grid mesh (102) is provided within the filler reinforcement zone (101) to prevent sediment loss. An energy-dissipating structure (200) is provided on each reinforced mesh (100) to reduce the kinetic energy of the seawater at the bottom of the seabed (400). This energy-dissipating structure (200) is a sand-patterned structure (202), and the sand-patterned structure (202) is connected to the reinforced mesh (100). The reinforcing mesh (100) is integrally formed; the reinforcing mesh (100) is made of concrete, and adjacent reinforcing meshes (100) are connected by connectors (103), and the side of the reinforcing mesh (100) is provided with connecting holes (104) to facilitate the connection of the connectors (103); the energy dissipation structure (200) is a protrusion (201) set on the reinforcing mesh (100); the connector (103) is a flexible part; the filling material in the filling reinforcement area (101) is silt, and the silt and the reinforcing mesh (100) are connected by curing agent, and the grid mesh (102) is embedded in the filling reinforcement area (101); when seawater flows through the protrusions (201) on both sides of the filling reinforcement area (101), it collides with the protrusions (201) to dissipate the kinetic energy of the seawater.

2. The protective device for preventing scour of pile foundations according to claim 1, characterized in that, The number of connection holes (104) on the side of the reinforcing mesh (100) is not less than four.

3. The protective device for preventing scour of pile foundations according to claim 1, characterized in that, The diameter of the pile foundation (300) is D, the height of the reinforcing grid (100) is not less than 0.04D, and the thickness of the reinforcing grid (100) is not less than 100mm.

4. The protective device for preventing scour of pile foundations according to claim 3, characterized in that, The reinforcing mesh structure is laid within a range of not less than 5D around the pile foundation (300), and the seabed (400) within a range of 0.5D to 1D around the reinforcing mesh structure is cured by a curing agent.

5. The protective device for preventing scour of pile foundations according to claim 4, characterized in that, There are multiple filler reinforcement zones (101), and each filler reinforcement zone (101) is distributed in a matrix.

6. The protective device for preventing scour of pile foundations according to any one of claims 1 to 5, characterized in that, The grid (102) is a mesh structure formed by interlaced steel wires, and the diameter of the steel wires is not less than 10mm.

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