Offshore wind turbine pile foundation scour pit self-repairing system and application method thereof

Abstract

The invention relates to the field of protection of offshore wind turbine pile foundations, in particular to an offshore wind turbine pile foundation scour pit self-repairing system and an application method of the offshore wind turbine pile foundation scour pit self-repairing system. The silt adsorption device is arranged in the net bag and is used for capturing suspended silt entering along with the water flow and promoting the suspended silt to settle; the sand collecting box is arranged on the periphery of the fan pile foundation, the bottom end of the net bag and the bottom end of the sediment adsorption device are arranged on the top of the sand collecting box, sand penetrating holes are formed in the top of the sand collecting box, suspended sediment captured by the sediment adsorption device can penetrate through the sand penetrating holes to settle into the sand collecting box to be collected, and a sand conveying opening is formed in the lower portion or the bottom of the sand collecting box; the connecting assembly is arranged on the sand collecting box and used for fixing the whole automatic sand collecting device to a seabed; and the sand conveying pipe is connected with the sand conveying opening and used for conveying the sand collected in the sand collecting box into the scouring pit. The device can automatically repair the scour pit around the fan pile foundation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of offshore wind turbine pile foundation protection, in particular to an offshore wind turbine pile foundation scour pit self-repairing system and an application method thereof. BACKGROUND

[0002] With the rapid development of offshore wind power industry, the long-term stable operation of large wind turbines in the marine environment faces many challenges. As a key part of the support structure, the pile foundation directly bears the dynamic load of the complex marine environment. In the marine environment, the pile foundation is subjected to the action of tidal current, wave and other hydrodynamic forces for a long time, and the surrounding seabed will show obvious scouring phenomenon. This scouring effect will cause the formation of scour pits with different depths around the pile, which seriously affects the bearing capacity and structural stability of the pile foundation.

[0003] At present, the technical measures for offshore wind turbine pile foundation scour protection mainly include riprap protection, concrete protection skirt installation and sand bag stacking, etc. These traditional protection methods can slow down the scouring to a certain extent, but they belong to passive protection in nature. When the scouring exceeds the design threshold, these protection structures often fail, and manual intervention is needed for repair or reconstruction. More importantly, the existing protection measures lack the self-adaptive recovery ability of the scouring seabed morphology, and cannot realize the benign cycle of "damage-repair". This directly leads to the shortening of the offshore wind power operation and maintenance cycle, the increase of the maintenance frequency, and the significant increase of the whole life cycle operation cost. Especially in the deep sea area, frequent maintenance operations under harsh sea conditions not only have high cost, but also face huge construction safety risks. SUMMARY

[0004] The purpose of the present application is to provide an offshore wind turbine pile foundation scour pit self-repairing system which can automatically repair the scour pits around the wind turbine pile foundation.

[0005] Another purpose of the present application is to provide an application method of an offshore wind turbine pile foundation scour pit self-repairing system which can automatically repair the scour pits around the wind turbine pile foundation.

[0006] The technical solution of the present application is as follows: An offshore wind turbine pile foundation scour pit self-repairing system, comprising at least one automatic sand collecting device, the automatic sand collecting device comprising: a net bag having a plurality of mesh holes for slowing down the flow and allowing seawater to flow in and out, the bottom end of the net bag having a mesh opening; a silt adsorption device arranged inside the net bag for capturing suspended silt entering with the water flow and promoting its settlement; A sand collecting box is arranged around the fan pile foundation, the bottom end of the net bag and the bottom end of the sand adsorption device are arranged on the top of the sand collecting box respectively, the top of the sand collecting box is provided with a sand permeable hole, the suspended sand captured by the sand adsorption device can pass through the sand permeable hole and sink into the sand collecting box for collection, and the lower part or the bottom of the sand collecting box is provided with a sand conveying opening; A connecting assembly is arranged on the sand collecting box and used for fixing the automatic sand collecting device on the seabed; A sand conveying pipe is connected with the sand conveying opening and used for conveying the sand collected in the sand collecting box to the scour pit.

[0007] Further, the net bag is an inverted conical net bag, and the net bag is made of a hard material resistant to seawater corrosion and has shape retention.

[0008] Further, the sand adsorption device comprises an inverted conical support framework and an electrostatic adsorption material capable of generating static electricity, and the electrostatic adsorption material is wrapped on the outer side of the support framework.

[0009] Further, the number of the automatic sand collecting devices is not less than two, and the automatic sand collecting devices are arranged circumferentially along the fan pile foundation, and at least one is arranged on the pile foundation upstream and downstream in the reciprocating tidal current direction respectively.

[0010] Further, at least one of the automatic sand collecting devices is arranged in the area of the formed or easily formed scour pit.

[0011] Further, the diameter of the fan pile foundation is D, and the radial distance between the automatic sand collecting device and the fan pile foundation is not greater than 0.5D.

[0012] Further, at least one standby automatic sand collecting device is further included, the standby automatic sand collecting device has the same structure as the automatic sand collecting device, the standby automatic sand collecting device is arranged on the seabed plane, the height of the sand collecting box of the standby automatic sand collecting device is higher than the height of the sand collecting box of the automatic sand collecting device, and the height of the sand collecting box of the standby automatic sand collecting device is higher than the height of the sand collecting box of the automatic sand collecting device, and a connecting pipe is connected between the sand collecting box of the standby automatic sand collecting device and the sand collecting box of the automatic sand collecting device, and the sand collected by the standby automatic sand collecting device can be conveyed into the sand collecting box of the automatic sand collecting device through the connecting pipe.

[0013] Further, an opening and closing structure is further included, the opening and closing structure is connected with the top end of the net bag and used for controlling the opening and closing of the net bag.

[0014] Further, the opening and closing structure comprises an electric push rod suitable for seawater, the area of the electric push rod in contact with seawater is provided with a marine waterproof coating, or the shell and the piston rod of the electric push rod are made of a material resistant to seawater corrosion. The electric push rod is arranged on the silt adsorption device, and a piston rod of the electric push rod is connected with a top center of the net bag.

[0015] A method for using the offshore wind turbine pile foundation scour hole self-repairing system as described, comprising the following steps: The automatic sand collecting device is arranged on the seabed around the wind turbine pile foundation; The net bag is used to slow down the local water flow speed, and the silt adsorption device is used to capture the suspended silt in the water body and make the silt sink into the sand collecting box for storage. When the scour hole deepens, the sand in the sand collecting box is automatically transported to the scour hole area through the sand transporting pipe for backfilling.

[0016] Compared with the prior art, the beneficial effects of the present application are: The present application provides an offshore wind turbine pile foundation scour hole self-repairing system. The automatic sand collecting device is arranged on the seabed around the wind turbine pile foundation, the sand collecting box is fixedly arranged in the scour hole, and the bottom of the sand collecting box is located at a higher position in the scour hole. The net bag is used to slow down the local water flow speed, and the silt adsorption device is used to capture the suspended silt in the water body and make the silt sink into the sand collecting box for storage. When the scour hole deepens, since there is a height difference between the sand transporting port at the bottom of the sand collecting box and the deepened area of the scour hole, the sand in the sand collecting box is automatically transported to the scour hole area through the sand transporting pipe for backfilling under the action of gravity, so that the scour hole deepened area is automatically repaired by automatic backfilling. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 Fig. 1 is a structural layout schematic diagram of the offshore wind turbine pile foundation scour hole self-repairing system of the present application embodiment 1; Figure 2 Fig. 2 is a structural schematic diagram of the offshore wind turbine pile foundation scour hole self-repairing system of the present application; Figure 3 Fig. 4 is a structural schematic diagram of the offshore wind turbine pile foundation scour hole self-repairing system of the present application embodiment 4.

[0019] In the drawings: 1-automatic sand collecting device; 101-net bag; 102-silt adsorption device; 103-sand collecting box; 1031-one-way flow hole; 2-backup automatic sand collecting device; 3 - pile foundation; 4 - scour pit; 5 - sand transport pipe; 6 - anchor; 7 - connecting pipe. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0027] Example 1 Reference Figures 1-2 The present embodiment provides a scour hole self-repairing system for offshore wind turbine pile foundation, which comprises at least one automatic sand collecting device 1, the automatic sand collecting device 1 comprises: a net bag 101, the net bag 101 has a plurality of mesh holes for slowing down the flow and allowing seawater to flow in and out, and the bottom end of the net bag 101 has a mesh opening; a sand adsorption device 102 arranged inside the net bag 101, for capturing suspended silt entering with the water flow and promoting its settlement; a sand collecting box 103 arranged around the wind turbine pile foundation 3, the bottom end of the net bag 101 and the bottom end of the sand adsorption device 102 are respectively arranged at the top of the sand collecting box 103, the top of the sand collecting box 103 is provided with a sand permeable hole, the suspended silt captured by the sand adsorption device 102 can pass through the sand permeable hole and settle into the sand collecting box 103 for collection, and the lower part or bottom of the sand collecting box 103 is provided with a sand outlet; preferably, the bottom of the sand collecting box 103 is provided with a sand outlet; a connecting assembly arranged on the sand collecting box 103, for fixing the entire automatic sand collecting device 1 to the seabed; a sand conveying pipe 5 connected to the sand outlet, for conveying the sand collected in the sand collecting box 103 into the scour hole 4, as shown in Figure 2 Preferably, the sand conveying pipe 5 can have a certain flexibility and density to deform according to the topography of the seabed surface, the flexibility means that the sand conveying pipe 5 can automatically adjust its position on the seabed surface according to the change of the topography, and the density means that the density of the sand conveying pipe 5 is greater than the density of seawater, so that it does not float in water, but always adheres to the seabed surface.

[0028] Specifically, the connecting assembly can adopt an anchor 6 to fix the device to the seabed surface, and the anchor 6 can adopt a fixed pile, a suction anchor or the like structure.

[0029] The net bag 101 is an inverted conical net bag 101 made of a hard material and having shape retention. The mesh of the net bag 101 is always open to allow seawater to flow into the sediment adsorption device 102 for adsorption and precipitation. The net bag 101 can be made of a stainless steel woven bag or a plastic woven bag. The mesh of the net bag 101 can be a diamond-shaped hole or a round hole, and the size of the mesh ranges from 10 cm to 30 cm.

[0030] The sediment adsorption device 102 includes an inverted conical support framework and an electrostatic adsorption material capable of generating static electricity. The electrostatic adsorption material surrounds or covers the outside of the support framework. The electrostatic adsorption material includes at least one layer of non-woven fabric. When the suspended sediment contacts the non-woven fabric, the non-woven fabric generates static electricity. The non-woven fabric with electrostatic adsorption function can adsorb the sediment of the tidal current in the sediment adsorption device 102 to capture the sediment. When the amount of sediment adsorbed by the non-woven fabric exceeds the adsorption threshold, the sediment settles, and then the sediment is settled and enters the sand collection box 103 through the sand permeable hole for collection.

[0031] The preferred embodiment provides that the number of automatic sand collecting devices 1 is not less than two and is arranged circumferentially around the wind turbine pile foundation 3. In the reciprocating tidal current direction, at least one is arranged on the windward side and the leeward side of the pile foundation 3, respectively.

[0032] The automatic sand collecting device 1 is arranged in at least one circle in the area of the scour pit 4 that has been formed or is prone to be formed. The position of the seabed close to the wind turbine pile foundation 3 is prone to form a scour pit 4, and this part of the area is prone to deepen. Therefore, the output port of the sand collection box 103 is directed to the position close to the pile foundation 3 in the scour pit 4, so that the sediment discharged from the sand discharge port is more easily backfilled in these areas prone to deepen, improving the repair effect.

[0033] The automatic sand collecting device 1 is fixedly arranged in the scour pit 4 area by the anchor 6. It is necessary to keep the bottom of the sand collection box 103 at a high position, so that after the scour pit 4 is deepened, the sediment in the sand collection box 103 can automatically flow into the deepened scour pit 4 for backfilling and repairing. It should be noted that the height of the anchor 6 is not limited to the height shown in the figure. The anchor 6 in the figure is only a schematic representation and does not represent the actual height. The height of the anchor 6 is designed according to the actual situation.

[0034] Preferably, in the radial direction, the diameter of the wind turbine pile foundation 3 is D, and the radial distance between the automatic sand collecting device 1 and the wind turbine pile foundation 3 is not greater than 0.5D.

[0035] The system can also be provided with at least one standby automatic sand collecting device 2, which has the same structure as the automatic sand collecting device 1. Each automatic sand collecting device 1 is respectively provided with one standby automatic sand collecting device 2. The standby automatic sand collecting device 2 is arranged on the seabed plane. The height of the sand collecting tank 103 of the standby automatic sand collecting device 2 is higher than the height of the sand collecting tank 103 of the automatic sand collecting device 1. The height of the sand collecting tank 103 of the standby automatic sand collecting device 2 is higher than the height of the sand collecting tank 103 of the automatic sand collecting device 1, and a connecting pipe 7 is connected between the sand collecting tank 103 of the standby automatic sand collecting device 2. The sand collected by the standby automatic sand collecting device 2 can be transported to the sand collecting tank 103 of the automatic sand collecting device 1 through the connecting pipe 7, thereby increasing the sand collection and storage capacity of the sand collecting tank 103 of the automatic sand collecting device 1.

[0036] In order to distinguish the sand collecting tank 103 of the automatic sand collecting device 1 and the sand collecting tank 103 of the standby automatic sand collecting device 2, the sand collecting tank 103 of the automatic sand collecting device 1 is defined as the main sand collecting tank 103, and the sand collecting tank 103 of the standby automatic sand collecting device 2 is defined as the standby sand collecting tank 103. A one-way flow hole 1031 is formed on the side of the main sand collecting tank 103. The sand outlet at the bottom of the standby sand collecting tank 103 is connected to the one-way flow hole 1031. A one-way valve or a one-way valve structure is installed in the one-way flow hole 1031. Only external sand is allowed to enter, and internal sand is prevented from leaking out, that is, only sand outside the main sand collecting tank 103 is allowed to flow into the main sand collecting tank 103, and sand in the main sand collecting tank 103 cannot flow out through the one-way flow hole 1031, thereby ensuring the sand storage capacity of the main sand collecting tank 103.

[0037] When each automatic sand collecting device 1 is provided with multiple standby automatic sand collecting devices 2, multiple one-way flow holes 1031 can be formed on the side of the main sand collecting tank, and are respectively connected to the multiple standby sand collecting tanks 103 through the connecting pipes 7. The multiple standby sand collecting tanks 103 are connected to the main sand collecting tank 103 in a parallel manner, or the multiple standby sand collecting tanks 103 can be connected to the main sand collecting tank 103 in a serial manner.

[0038] It should be noted that the side of the sand collecting tank 103 can also be separately provided with one-way flow holes 1031. These one-way flow holes 1031 are not connected to the standby sand collecting tank 103, but are used to receive sand flowing from seawater, so that only external sand is allowed to flow into the sand collecting tank 103, and sand in the sand collecting tank 103 cannot flow out, thereby improving the sand storage effect in the tank.

[0039] The application method of the offshore wind turbine pile foundation scour pit self-repairing system includes the following steps: Layout: The automatic sand collecting device 1 is laid on the seabed around the wind turbine pile foundation 3. Sand trapping and storage: The mesh bag 101 is used to slow down the local water flow speed, and the sand trapping device 102 is used to trap suspended sand in the water body and sink into the sand collecting tank 103 for storage. Sand backfilling: when the scour pit 4 deepens, the sand in the sand collecting box 103 is automatically transported to the scour pit 4 area through the sand conveying pipe 5 for backfilling repair.

[0040] Embodiment 2 The embodiment provides a scour pit self-repairing system for a pile foundation of an offshore wind turbine, which is different from the technical scheme of embodiment 1 in that: In the embodiment, the automatic sand collecting device 1 can be arranged in an area outside the scour pit 4, that is, the sand collecting box 103 of the automatic sand collecting device 1 is fixed to the seabed plane through the anchor 6, but the sand conveying pipe 5 of the sand collecting box 103 leads to the easy deepening area in the scour pit 4, when the scour pit 4 deepens, the sand collected in the sand collecting box 103 can be automatically discharged along the sand conveying pipe 5 and backfilled to the deepening area of the scour pit 4.

[0041] Meanwhile, it should also be noted that the standby automatic sand collecting device 2 is fixed to the seabed plane through the anchor 6, and the height of the sand collecting box 103 of the standby automatic sand collecting device 2 is higher than that of the sand collecting box 103 of the automatic sand collecting device 1, so that the sand collected in the standby automatic sand collecting device 2 can also be discharged to the sand collecting box 103 of the automatic sand collecting device 1 through gravity.

[0042] Embodiment 3 The embodiment provides a scour pit self-repairing system for a pile foundation of an offshore wind turbine, which is different from the technical scheme of embodiment 1 in that: The net bag 101 is made of a flexible material, such as a nylon woven net bag, and the system further comprises an opening and closing structure connected with the top end of the net bag 101 and used for controlling the opening and closing of the net bag 101.

[0043] The opening and closing structure in the embodiment provides the following two schemes: The opening and closing structure comprises an electric push rod suitable for seawater and capable of resisting seawater corrosion for a long time, for example, a marine waterproof coating is arranged on the area of the electric push rod in contact with seawater, or the shell and piston rod of the electric push rod are made of a seawater corrosion resistant material, such as stainless steel or 5083 aluminum alloy. The electric push rod is vertically arranged on the sand adsorption device 102, and the piston rod of the electric push rod is connected with the top center of the net bag 101. The electric push rod can be powered by the offshore wind power platform, and when the electric push rod is extended, the net bag 101 is lifted to be in the closed state, and the mesh is reduced or closed; on the contrary, when the electric push rod is in the initial state or the retracted state, the net bag 101 is pulled down to be in the open state, and the mesh is opened to allow the sand to flow in.

[0044] Alternatively, the opening and closing structure includes a buoy and a rope. The buoy is placed on the net 101 and connected to the center of the top of the net 101 via the rope. The buoy has a hollow cavity and is provided with a water inlet and a water outlet. The water inlet is equipped with a water pump to control the pumping of seawater into the hollow cavity, causing the buoy to sink and thus the net 101 to be in an open state. The water outlet is equipped with a water pump to control the discharge of seawater from the buoy, causing the buoy to float and thus pulling the top of the net 101 upward, so that the net 101 is in a closed state.

[0045] It also includes a controller, with the electric push rod electrically connected to the controller, or the water pump and drainage pump electrically connected to the controller, so as to control the operation of the opening and closing structure through the controller, so as to better control the opening and closing of the net bag 101.

[0046] Note: The controller can be housed within a seawater-proof enclosure. The electrical wires connecting the controller to the opening / closing mechanism should pass through the enclosure and the connections should be sealed to prevent seawater ingress. The controller can be powered by an offshore wind power platform.

[0047] Example 4 This embodiment provides a self-repairing system for scour pits in offshore wind turbine pile foundations, which differs from the technical solution in Embodiment 1 in that: In this embodiment, only one automatic sand collection device 1 is installed, and it is arranged around the wind turbine pile foundation 3, such as... Figure 3 As shown, the wind turbine pile foundation 3 is located at the central axis of the conical net 101. The wind turbine pile foundation 3 vertically passes through the net 101, the sediment adsorption device 102 (a conical support frame with no gauze on the outside), and the sand collection box 103. The sand collection box 103 can be directly fixed to the wind turbine pile foundation 3 or fixed to the seabed by the anchor 6. The sand collection box 103 needs to be kept at a high height so that the sediment in the sand collection box 103 can be discharged into the deepened area of ​​the scour pit 4 by gravity, so as to achieve automatic backfilling and repair. The sand conveying pipe 5 has a trumpet-shaped structure with a small upper end and a large lower end, so as to facilitate uniform backfilling into the scour pit 4 around the pile foundation 3.

[0048] Example 5 An application method for the self-healing system for scour pits in offshore wind turbine pile foundations as described above includes the following steps: Multiple automatic sand collection devices 1 and backup automatic sand collection devices 2 are arranged on the seabed around the wind turbine pile foundation 3, and the sand collection boxes 103 are interconnected by connecting pipes 7. The net 101 is used to slow down the local water flow speed, and the sediment adsorption device 102 is used to capture suspended sediment in the water, so that it settles into the sediment collection box 103 for storage. When the scour pit 4 deepens, the mud and sand in the sand collection box 103 are automatically transported to the scour pit 4 area by gravity through the sand conveying pipe 5 for backfilling and repair. The sand is transported from the standby sand collecting tank 103 to the main sand collecting tank 103, so as to realize sand allocation among the multiple sand collecting tanks 103 through the connecting pipe 7, and to preferentially transport the sand collected away from the pile body to the area near the pile for repair.

[0049] The technical scheme of the present application has the following beneficial effects: The application provides a self-repairing system for a scour pit of an offshore wind turbine pile foundation. The automatic sand collecting device 1 is arranged around the sea bed of the wind turbine pile foundation 3. The sand collecting tank 103 is fixedly arranged in the scour pit 4, and the bottom of the sand collecting tank 103 is located at a higher position in the scour pit 4. The mesh bag 101 is used to slow down the local water flow speed. The sand collecting tank 103 is used to capture the suspended sand in the water body by cooperating with the sand adsorption device 102, and store the sand in the sand collecting tank 103. When the scour pit 4 is deepened, the sand in the sand collecting tank 103 is automatically transported to the scour pit 4 area for backfilling under the action of gravity and through the sand transporting pipe 5, so as to realize automatic backfilling and automatically repair the deepened area of the scour pit 4. The whole system has simple structure and low cost, and has remarkable automatic repairing effect.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 application.

[0051] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-repairing system for scour pits in offshore wind turbine pile foundations, characterized in that, Includes at least one automatic sand collection device (1), said automatic sand collection device (1) comprising: A net (101) having multiple mesh openings for slowing the flow and allowing seawater to flow in and out, and a mesh opening at the bottom end of the net (101); A sediment adsorption device (102) is installed inside the net (101) to capture suspended sediment that enters with the water flow and promote its sedimentation. A sand collection box (103) is set around the wind turbine pile foundation (3). The bottom end of the net bag (101) and the bottom end of the mud and sand adsorption device (102) are respectively set on the top of the sand collection box (103). The top of the sand collection box (103) is provided with a sand passage hole. The suspended mud and sand captured by the mud and sand adsorption device (102) can pass through the sand passage hole and settle into the sand collection box (103) for collection. The lower part or bottom of the sand collection box (103) is provided with a sand conveying port. A connecting component is provided on the sand collection box (103) for fixing the entire automatic sand collection device (1) to the seabed; The sand conveying pipe (5) is connected to the sand conveying port and is used to transport the mud and sand collected in the sand collection box (103) to the scour pit (4).

2. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 1, characterized in that, The net (101) is an inverted conical net (101), and the net (101) is made of a hard material that is resistant to seawater corrosion and has shape retention.

3. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 1, characterized in that, The sediment adsorption device (102) includes an inverted conical support frame and an electrostatic adsorption material capable of generating static electricity, the electrostatic adsorption material surrounding the outside of the support frame.

4. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 1, characterized in that, The number of automatic sand collection devices (1) shall not be less than two and shall be arranged around the circumference of the wind turbine pile foundation (3). In the direction of reciprocating current flow, at least one shall be set on the front and back face of the pile foundation (3).

5. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 4, characterized in that, The automatic sand collection device (1) has at least one ring arranged in the area of ​​the scour pit (4) that has been formed or is easily formed.

6. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 5, characterized in that, The diameter of the wind turbine pile foundation (3) is D, and the radial distance between the automatic sand collection device (1) and the wind turbine pile foundation (3) is no greater than 0.5D.

7. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 6, characterized in that, It also includes at least one backup automatic sand collection device (2), which has the same structure as the automatic sand collection device (1). The backup automatic sand collection device (2) is set on the seabed plane. The height of the sand collection box (103) of the backup automatic sand collection device (2) is higher than the height of the sand collection box (103) of the automatic sand collection device (1). A connecting pipe (7) is connected between the height of the sand collection box (103) of the backup automatic sand collection device (2) and the height of the sand collection box (103) of the automatic sand collection device (1). The sediment collected by the backup automatic sand collection device (2) can be transported to the sand collection box (103) of the automatic sand collection device (1) through the connecting pipe (7).

8. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 2, characterized in that, It also includes an opening and closing structure, which is connected to the top of the net (101) and is used to control the opening and closing of the net (101).

9. The self-repairing system for scour pits in offshore wind turbine pile foundations according to claim 8, characterized in that, The opening and closing structure includes an electric actuator that is suitable for seawater, wherein the area of ​​the electric actuator that comes into contact with seawater is provided with a marine waterproof coating, or the housing and piston rod of the electric actuator are made of a seawater corrosion resistant material; The electric push rod is mounted on the mud and sand adsorption device (102), and the piston rod of the electric push rod is connected to the center of the top of the net (101).

10. An application method of the self-repair system for scour pits in offshore wind turbine pile foundations as described in any one of claims 1-9, characterized in that, Includes the following steps: The automatic sand collection device (1) is installed on the seabed around the wind turbine pile foundation (3); The net (101) is used to slow down the local water flow speed, and the sediment adsorption device (102) is used to capture the suspended sediment in the water and let it settle into the sediment collection box (103) for storage. As the scour pit (4) deepens, the sand in the sand collection box (103) is automatically transported to the scour pit (4) area through the sand conveying pipe (5) for backfilling.

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