Offshore wind power large diameter single pile foundation scour protection and active repair device

Abstract

The application discloses a scouring protection and active repair device for offshore wind power large-diameter single-pile foundation, relates to the technical field of offshore single-pile wind turbine foundation protection, and comprises a sand filtering and flow disturbing assembly and a scouring pit repair assembly, the sand filtering and flow disturbing assembly is arranged around the single-pile foundation to intercept and collect silt carried by sea current; wherein the scouring pit repair assembly comprises a lifting ring, a connecting rod and a silt scraping plate, the lifting ring is arranged on the outer wall of the single-pile foundation in a lifting and rotating mode, the silt scraping plate is connected with the lifting ring through the connecting rod, and the silt scraping plate pushes the silt collected by the sand filtering and flow disturbing assembly into the scouring pit under the driving of the lifting ring; and the application further comprises a monitoring assembly for monitoring the formation of the scouring pit around the single-pile foundation. The application integrates real-time monitoring, active repair and self-power supply functions, realizes sand filtering and flow disturbing, lifting and rotating silt scraping cooperative operation, accurately fills and resets the scouring pit, effectively inhibits the development of scouring, and significantly improves the safety and service life of the pile foundation.

Description

Technical Field

[0001] This invention relates to the field of offshore monopile wind turbine foundation protection technology, and in particular to a device for scour protection and active repair of large-diameter offshore wind turbine monopile foundations. Background Technology

[0002] With the rapid development of the offshore wind power industry, monopile foundations have been widely used due to their simple structure and convenient construction. However, monopile foundations are subjected to hydrodynamic forces such as waves and tides in the marine environment for a long time, and the soil around the pile is easily eroded to form scour pits, which leads to a decrease in the bearing capacity of the pile foundation and may even cause structural instability.

[0003] Currently, common engineering measures for scour protection of monopile foundations mainly include riprap placement and laying protective mats. While these methods can delay scour development to some extent, they have the following shortcomings: First, these measures are passive protection, only slowing down the scouring effect of water flow and unable to actively intervene and repair after the scour pit has formed. Furthermore, they are complex to construct and difficult to maintain. Second, traditional protection methods lack real-time monitoring capabilities, failing to dynamically perceive the formation and development of scour pits. They are often only detected after significant displacement or tilting of the foundation, at which point the scour has already caused irreversible damage to structural safety, making repair difficult and costly. Third, existing automated protection devices mostly rely on shore-based power supply or periodic battery replacement. In deep-sea areas far from the coast, power supply becomes a key bottleneck restricting the long-term stable operation of the equipment.

[0004] Therefore, there is an urgent need to develop a scour protection and active repair device for large-diameter monopile foundations for offshore wind power, which can monitor the scour status in real time, actively repair scour pits, and have self-powering capabilities, thereby improving the safety and economy of offshore wind power foundations throughout their entire life cycle. Summary of the Invention

[0005] The purpose of this invention is to provide a device for scour protection and active repair of large-diameter monopile foundations for offshore wind power, so as to solve the above-mentioned problems in the prior art, realize active monitoring and repair of scour pits, and improve the scour resistance and structural safety of monopile foundations.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a device for scour protection and active repair of large-diameter monopile foundations for offshore wind power, including a sand filtering and turbulence assemblies, which are arranged around the monopile foundation to intercept and collect sediment carried by ocean currents. The scour pit repair component includes a lifting ring, a connecting rod, and a scraper. The lifting ring is rotatably and vertically fitted onto the outer wall of the monopile foundation. One end of the connecting rod is connected to the lifting ring, and the other end of the connecting rod is connected to the scraper. The scraper pushes the silt collected by the sand filtering and turbulence component into the scour pit under the action of the lifting ring. It also includes a monitoring component for monitoring the formation of scour pits around the monopile foundation. When the scour pit reaches a preset depth, the monitoring component triggers a start signal, and the lifting ring and the scraper push the collected mud and sand into the scour pit to complete the repair work.

[0007] Furthermore, the monitoring component includes a light sensor, which is installed on the outer wall below the mud surface of the monopile foundation. When the light sensor detects that the scour pit has reached a preset depth, it triggers the lifting ring to rise and rotate, which drives the scraper to rotate around the monopile foundation and move radially toward the pile center via the connecting rod, scraping the mud and sand collected by the sand filtering and turbulence component into the scour pit for filling. It also includes a power supply component that supplies power to the light sensor and the power components within the lifting ring.

[0008] Furthermore, the lifting ring is equipped with a drive mechanism, which includes an electric motor, an upper ring gear driven by the electric motor, a first gear meshing with the upper ring gear, a second gear meshing with the first gear, and a lifting wheel connected to the second gear and in contact with the outer wall of the monopile foundation. After the electric motor is started, it drives the lifting wheel to rotate through the upper meshing gear set, thereby driving the lifting ring to complete the lifting operation.

[0009] Furthermore, the drive mechanism also includes a third gear meshing with the first gear, and a lower ring gear meshing with the third gear. The lower ring gear is provided with a lifting lug, which is connected to the connecting rod via a pin. After the motor starts, it drives the connecting rod and the scraper to rotate through the lower meshing gear set.

[0010] Furthermore, it also includes a limiter, which includes a limiter inner shell fixed to the outer wall of the monopile foundation, a limiter outer shell sleeved outside the limiter inner shell, and a plurality of balls disposed between the limiter inner shell and the limiter outer shell. The limiter outer shell is connected to the connecting rod through a hydraulic rod, and the hydraulic rod guides the connecting rod during the lifting and lowering of the lifting ring. When the lifting ring rises or falls, it simultaneously moves the bottom end of the connecting rod closer to or away from the outer wall of the monopile foundation, and the length of the telescopic rod on the hydraulic rod shortens or lengthens simultaneously.

[0011] Furthermore, the sand filtration and turbulence control assembly includes two support rods, a nylon sand filter mesh connected between the two support rods, and a base set at the bottom of the support rods, with the lower end of the support rods anchored in the seabed soil.

[0012] Furthermore, the base has a trapezoidal structure, with ramps at the top and front to guide the mud and sand to slide down towards the scour pit.

[0013] Furthermore, the number of the sand filtering and turbulence-disrupting components is set to an odd number, and there is another component on the opposite side of the gap between each pair of adjacent components to form an interception.

[0014] Furthermore, the power supply component includes a hydro-generator set located at sea level on the outer wall of the monopile foundation, and a battery located inside the lifting ring. The hydro-generator set is electrically connected to the battery and charges the battery. The hydro-generator set generates electricity by water flow, and the battery supplies power to the light sensor and the motor.

[0015] Furthermore, it also includes multiple blocks fixed to the outer wall of the monopile foundation, the blocks being located directly below the lifting wheel of the lifting ring and restricting the static position of the lifting ring.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1) This invention enables real-time monitoring and proactive repair: By deploying a light sensor at a preset depth below the mud surface of the monopile foundation, the formation status of scour pits can be detected in real time. Once the scour depth reaches the warning value, the system automatically triggers the repair mechanism to proactively and accurately fill the scour pits, significantly improving the timeliness and intelligence of the protection response.

[0017] 2) The present invention adopts an integrated protection and repair structure: the sand filtering and turbulence component has the dual functions of anti-scouring and sediment collection. It can slow down the scouring process of the soil around the pile under the action of water flow, and effectively intercept and store quicksand, providing a sufficient source of sediment for subsequent repair, forming an integrated closed-loop system of "protection-collection-repair".

[0018] 3) The present invention designs a highly efficient and precise repair execution mechanism: the lifting ring has a built-in multi-stage gear transmission system, which drives the sand scraper to move up and down and rotate along the outer wall of the single pile foundation. Combined with the guiding role of the limiter, the sand scraper can gradually move inward during rotation, and evenly fill the collected mud and sand into the scour pit. After the repair is completed, it automatically resets to ensure that the device returns to the standard standby state after each operation.

[0019] 4) The self-powered system of the present invention is more adapted to the marine environment: The present invention is equipped with a water turbine generator set and a storage battery, which uses ocean current energy to continuously generate electricity and provide a stable power supply for each component, solving the problem of lack of external power supply for offshore wind power foundations. It has the advantages of energy saving and environmental protection, low operating cost and strong adaptability.

[0020] 5) The invention has a reasonable structural design and is adapted to harsh marine environments: key components such as stainless steel support rods and nylon filter screens are made of corrosion-resistant and high-toughness materials. The base adopts a trapezoidal sloping structure design, which facilitates the sliding and accumulation of mud and sand, and ensures that the device can operate stably for a long time in complex marine environments.

[0021] This invention integrates real-time monitoring, active repair, and self-powered functions. Through sand filtration and turbulence, and coordinated operation of lifting and rotating sand scraping, it accurately fills scour pits and automatically resets them, effectively inhibiting scour development and significantly improving the safety and service life of pile foundations. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a front view of the device for scour protection and active repair of large-diameter monopile foundations for offshore wind power according to the present invention. Figure 2 This is a perspective view of the scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to the present invention. Figure 3 This is a top view of the device for scour protection and active repair of large-diameter monopile foundations for offshore wind power according to the present invention. Figure 4 This is a top view of the internal structure of the lifting ring of the present invention; Figure 5 This is a front view schematic diagram of the internal structure of the lifting ring of the present invention; Figure 6 This is a perspective view of the internal structure of the lifting ring of the present invention; Figure 7 This is a schematic diagram of the limiting component structure of the present invention; Figure 8 This is a schematic diagram of the connecting rod and scraper plate structure of the present invention; Figure 9 This is a front view of the structure of the sand turbulence assemblies of the present invention; Figure 10 This is a top view of the structure of the sand turbulence evacuation component of the present invention; Figure 11 This is a schematic diagram of the stop block structure of the present invention.

[0024] Explanation of reference numerals in the attached diagram: 1. Monopile foundation; 2. Lifting ring; 3. Limiting component; 4. Light sensor; 5. Sand filtering and turbulence control component; 6. Connecting rod; 7. Sand scraper; 8. Stop block; 9. Hydroelectric generator; 201. Gear No. 1; 202. Electric motor; 203. Gear No. 2; 204-1. Lower ring gear; 204-2. Upper ring gear; 205. Lifting wheel; 206. Lifting lug; 207. Gear No. 3; 301. Limiter housing; 302. Limiter inner housing; 303. Ball bearing; 304. Hydraulic rod; 501, support rod; 502, nylon filter screen; 503, base; 601, pin. Detailed Implementation

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1-11 As shown, a device for scour protection and active repair of large-diameter monopile foundations for offshore wind power includes a sand-filtering and turbulence-disrupting component 5. The sand-filtering and turbulence-disrupting component 5 is arranged around the monopile foundation 1 to intercept and collect sediment carried by ocean currents, while preventing sediment loss on the inner side of the component and collecting sediment on the outer side of the component, thereby further turbulence-disrupting the flow to reduce local scour. The scour pit repair component includes a lifting ring 2, a connecting rod 6, and a scraper 7. The lifting ring 2 is rotatably and vertically fitted onto the outer wall of the monopile foundation 1. One end of the connecting rod 6 is connected to the lifting ring 2, and the other end is connected to the scraper 7. Driven by the lifting ring 2, the scraper 7 pushes the silt collected by the sand filtration and turbulence component into the scour pit. The inclination direction of the scraper 7 is consistent with the rotation direction of the lifting ring 2, which can generate a thrust towards the monopile foundation 1 during rotation, guiding the sand to accumulate in the scour pit and improving the silt filling efficiency. It also includes a monitoring component for monitoring the formation of scour pits around the monopile foundation 1; when the scour pit reaches a preset depth, the monitoring component triggers a start signal, and the lifting ring 2 and the sand scraper 7 push the collected mud and sand into the scour pit to complete the repair work.

[0027] Specifically, the monitoring component includes a light sensor 4, which is installed on the outer wall of the monopile foundation 1 below the mud surface. When the light sensor 4 detects that the scour pit has reached a preset depth, it triggers the lifting ring 2 to rise and rotate. This, via the connecting rod 6, drives the scraper 7 to rotate around the monopile foundation 1 and move radially towards the pile center, scraping the mud and sand collected by the sand filtering and turbulence component 5 into the scour pit for filling. The component also includes a power supply component that supplies power to the light sensor 4 and the power components within the lifting ring 2. Other monitoring components that can monitor scour pits can also be used in this device. The light sensor is a device that converts light signals into electrical signals. Its core function is to sense the light intensity in the environment and convert it into a measurable electrical signal output for subsequent circuit or system processing. Specifically, in one embodiment, appropriately sized parts are selected and assembled as needed, and a preset light intensity threshold is used based on the actual sea conditions. Multiple sensors can be combined to determine the scour depth as needed.

[0028] like Figure 4-6 As shown, the lifting ring 2 is equipped with a drive mechanism inside. The drive mechanism includes a motor 202, an upper ring gear 204-2 driven by the motor, a first gear 201 meshing with the upper ring gear, a second gear 203 meshing with the first gear 201, and a lifting wheel 205 connected to the second gear 203 and in contact with the outer wall of the monopile foundation 1. The second gear 203 and the lifting wheel 205 are coaxially arranged. The upper ring gear 204-2, the first gear 201, and the second gear 203 are selected according to their setting positions and transmission ratios, using appropriate gear specifications and styles. After the motor 202 is started, it drives the lifting wheel 205 to rotate through the upper meshing gear set, thereby driving the lifting ring 2 to complete the lifting operation.

[0029] The drive mechanism also includes a third gear 207 meshing with the first gear 201, and a lower ring gear 204-1 meshing with the third gear 207. The lower ring gear 204-1 is provided with a lifting lug 206, which is connected to the connecting rod 6 via a pin 601. After the motor 202 is started, it drives the connecting rod 6 and the scraper 7 to rotate through the lower meshing gear set.

[0030] Specifically, the lifting ring 2 includes four gears, including a first gear 201 and a second gear 203, which are combined with the upper ring gear 204-2 to form an upper meshing gear set. After the motor 202 starts, it synchronously drives the four lifting wheels 205 to rotate to complete the upward or downward movement. At the same time, one of the first gears 201, a third gear 207, and the lower ring gear 204-1 form a lower meshing gear set, which synchronously drives the connecting rod 6 and the scraper 7 to rotate to complete the scouring pit repair work.

[0031] like Figure 7 As shown, the system also includes a limiter 3, which comprises an inner limiter shell 302 fixed to the outer wall of the monopile foundation 1, an outer limiter shell 301 sleeved on the inner limiter shell, and multiple ball bearings 303 disposed between the inner limiter shell 302 and the outer limiter shell 301. The outer limiter shell 301 is connected to the connecting rod 6 via a hydraulic rod 304. The hydraulic rod 304 guides the connecting rod 6 during the lifting and lowering of the lifting ring 2. When the lifting ring 2 rises or falls, it synchronously drives the bottom end of the connecting rod 6 to move closer to or away from the outer wall of the monopile foundation 1, and the length of the telescopic rod on the hydraulic rod 304 shortens or extends synchronously. Specifically, the inner limiter shell 302 is fixedly installed on the outer wall of the monopile foundation 1 by welding, and the ball bearings 303 in the middle position can roll freely, effectively reducing the relative friction between the outer limiter shell 301 and the inner limiter shell 302.

[0032] One end of the hydraulic rod 304 is fixedly connected to the limiter housing 301, and the other end is connected to the connecting rod 6. The connecting rod 6 has a clearance groove along its length. The other end of the hydraulic rod 304 is movably connected to the connecting rod 6 via bolts passing through the clearance groove, ensuring that the hydraulic rod 304 can flexibly extend, retract, and rotate when the connecting rod 6 moves. During use, when the lifting ring 2 rises, the angle between the connecting rod 6 and the monopile foundation 1 gradually decreases, at which point the hydraulic rod 304 contracts under the pressure of the connecting rod 6. When the lifting ring 2 falls back, the angle between the connecting rod 6 and the monopile foundation 1 gradually increases, and the hydraulic rod 304 extends under internal oil pressure, smoothly pushing the connecting rod 6 outward to its initial position, achieving automatic reset. This ensures that the device can return to its standard standby state after each repair operation.

[0033] like Figure 9-10As shown, the sand-filtering and turbulence-disrupting component 5 includes two support rods 501, a nylon sand filter mesh 502 connected between the two support rods, and a base 503 disposed at the bottom of the support rods 501. The lower ends of the support rods 501 are anchored in the seabed soil. Specifically, the two support rods 501 are made of corrosion-resistant stainless steel, and their lower ends are anchored deep into the seabed soil. The nylon sand filter mesh 502 is woven from a high-toughness, corrosion-resistant special nylon material, which can effectively intercept quicksand particles in seawater without affecting the normal flow of water, thus ensuring the realization of the turbulence-disrupting function.

[0034] Specifically, the base 503 has a trapezoidal structure with a slope at its upper part. When the silt intercepted by the nylon filter screen 502 falls, it can slide smoothly down the slope and accumulate at the bottom of the base 503. The front of the base 503 also has a slope, allowing the silt accumulated at the bottom to flow smoothly into the circle of the sand-filtering turbulence component 5 under the influence of water flow, providing a sufficient source of silt for the repair of the scour pit. At the same time, the number of the sand-filtering turbulence components 5 is set to an odd number, and there is another component on the opposite side of the gap between each pair of adjacent components to form an interception, minimizing the occurrence of silt collection blind spots. The synergistic effect of the two ensures that the silt around the entire monopile foundation 1 can be effectively collected, reducing collection dead zones and providing sufficient material support for the rapid repair of the scour pit.

[0035] Specifically, the power supply components include a water turbine generator set 9 located at sea level on the outer wall of the monopile foundation 1, and a storage battery located inside the lifting ring 2. The water turbine generator set 9 is electrically connected to the storage battery and charges the storage battery. The water turbine generator set 9 generates electricity by water flow, and the storage battery supplies power to the light sensor 4 and the motor 202.

[0036] Specifically, such as Figure 1 , 11 As shown, the system also includes multiple stops 8 fixed to the outer wall of the monopile foundation 1 and evenly distributed around its circumference. The stops 8 are located directly below the lifting wheel 205 of the lifting ring 2 and restrict the static position of the lifting ring 2. In addition, the top of the stops 8 near the outer wall of the monopile foundation 1 is provided as an irregularly shaped positioning edge, the shape of which corresponds to the contour of the lifting ring 2, and a buffer pad can be provided on this surface to form a flexible contact and reduce impact damage.

[0037] The process of using this invention is as follows: First, the light sensor 4 is buried below the soil surface. In the dark environment, the equipment is stationary. At this time, the water turbine generator 9 charges the battery. Meanwhile, the sand filter and turbulence component 5 is arranged around the single pile foundation 1, continuously collecting quicksand while playing a turbulence role. When the scour pit is formed, the light sensor 4 enhances its light sensitivity and reaches the preset state, immediately triggering a signal to the lifting ring 2; the battery supplies power, and the motor 202 drives the upper meshing gear set to rotate the lifting wheel 205, and the lifting ring 2 begins to climb; at the same time, the lower ring gear 204-1 drives the connecting rod 6 and the sand scraper 7 to rotate around the pile.

[0038] Under the constraint of the limiter 3, when the lifting ring 2 climbs, the angle between the connecting rod 6 and the single pile foundation 1 becomes smaller, and the scraper 7 rotates and moves inward, accurately filling the scour pit with the mud and sand collected by the sand filtering and turbulence component 5. After the filling is completed, the light sensor 4 detects the dark environment, the battery stops supplying power, the motor 202 rotates in the opposite direction, which in turn drives the lifting ring 2 to fall to the stop block 8, and at the same time drives the connecting rod 6 and the scraper 7 to reset.

[0039] As can be seen, this device integrates sand filtration and disturbance, real-time monitoring, active repair, and self-powered functions: the sand filtration and disturbance components are arranged around the pile, serving both to intercept flowing sand and reduce scouring; light sensors are buried below the mud surface to monitor the formation of scour pits in real time through changes in light sensitivity; when the scour depth reaches a warning value, the lifting ring drives the scraper to rise, fall, and rotate around the pile, precisely filling the scour pit with the collected sediment; after repair, it automatically resets and returns to standby mode. The hydro-generator unit uses ocean current energy to charge the battery, ensuring the device's long-term autonomous operation. This invention achieves integrated closed-loop control of scour pits through "monitoring-protection-repair," effectively suppressing scour development, ensuring the bearing capacity and structural safety of the pile foundation, and significantly improving the service life and operational reliability of offshore wind power monopile foundations in complex marine environments.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for scour protection and active repair of large-diameter monopile foundations for offshore wind power, characterized in that: Includes a sand-filtering and turbulence-disrupting component (5), which is arranged around the monopile foundation (1) to intercept and collect the sediment carried by the ocean current; The scour pit repair component includes a lifting ring (2), a connecting rod (6), and a sand scraper (7). The lifting ring (2) is mounted on the outer wall of the monopile foundation (1) in a way that can be raised, lowered, and rotated. One end of the connecting rod (6) is connected to the lifting ring (2), and the other end of the connecting rod (6) is connected to the sand scraper (7). The sand scraper (7) pushes the mud and sand collected by the sand turbulence filter component into the scour pit under the drive of the lifting ring (2). It also includes a monitoring component for monitoring the formation of scour pits around the monopile foundation (1). When the scour pit reaches a preset depth, the monitoring component triggers a start signal, and the lifting ring (2) and the sand scraper (7) push the collected mud and sand into the scour pit to complete the repair work.

2. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 1, characterized in that: The monitoring component includes a light sensor (4), which is installed on the outer wall below the mud surface of the monopile foundation (1). When the light sensor (4) detects that the scour pit has reached a preset depth, it triggers the lifting ring (2) to rise and rotate, and drives the scraper (7) to rotate around the monopile foundation (1) and move radially toward the pile center through the connecting rod (6), so as to scrape the mud and sand collected by the sand filtering and turbulence component (5) into the scour pit for filling. It also includes a power supply component that supplies power to the light sensor (4) and the power components within the lifting ring (2).

3. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 2, characterized in that: The lifting ring (2) is equipped with a drive mechanism inside. The drive mechanism includes an electric motor (202), an upper ring gear (204-2) driven by the electric motor, a first gear (201) meshing with the upper ring gear, a second gear (203) meshing with the first gear (201), and a lifting wheel (205) connected to the second gear (203) and in contact with the outer wall of the monopile foundation (1). After the electric motor (202) is started, it drives the lifting wheel (205) to rotate through the upper meshing gear set, thereby driving the lifting ring (2) to complete the lifting operation.

4. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 3, characterized in that: The drive mechanism also includes a third gear (207) meshing with the first gear (201) and a lower ring gear (204-1) meshing with the third gear (207). The lower ring gear (204-1) is provided with a lifting lug (206). The lifting lug (206) is connected to the connecting rod (6) through a pin (601). After the motor (202) is started, it drives the connecting rod (6) and the scraper (7) to rotate through the lower meshing gear set.

5. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 1, characterized in that: It also includes a limiter (3), which includes a limiter inner shell (302) fixed to the outer wall of the monopile foundation (1), a limiter outer shell (301) sleeved on the limiter inner shell, and a plurality of balls (303) disposed between the limiter inner shell (302) and the limiter outer shell (301). The limiter outer shell (301) is connected to the connecting rod (6) through a hydraulic rod (304). The hydraulic rod (304) guides the connecting rod (6) during the lifting and lowering process of the lifting ring (2). When the lifting ring (2) rises or falls, it synchronously drives the bottom end of the connecting rod (6) to approach or move away from the outer wall of the single pile foundation (1), and the length of the telescopic rod on the hydraulic rod (304) shortens or extends synchronously.

6. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 1, characterized in that: The sand filtration and turbulence assembly (5) includes two support rods (501), a nylon sand filter mesh (502) connected between the two support rods, and a base (503) set at the bottom of the support rods (501). The lower end of the support rods (501) is anchored in the seabed soil.

7. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 6, characterized in that: The base (503) has a trapezoidal structure, and the upper and front parts of the base (503) are provided with slopes to guide the mud and sand to slide down to the direction of the scour pit.

8. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 6, characterized in that: The number of the sand filtering and turbulence components (5) is set to an odd number, and there is another component on the opposite side of the gap between each two adjacent components to form an interception.

9. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 3, characterized in that: The power supply components include a water turbine generator set (9) located at sea level on the outer wall of the monopile foundation (1) and a storage battery located inside the lifting ring (2). The water turbine generator set (9) is electrically connected to the storage battery and charges the storage battery. The water turbine generator set (9) generates electricity by water flow, and the storage battery supplies power to the light sensor (4) and the motor (202).

10. The scour protection and active repair device for large-diameter monopile foundations in offshore wind power according to claim 1, characterized in that: It also includes a plurality of blocks (8) fixed to the outer wall of the monopile foundation (1), the blocks (8) being located directly below the lifting wheel (205) of the lifting ring (2) and restricting the static position of the lifting ring (2).

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