An offshore wind power pile foundation anti-scour device

Abstract

The present invention relates to the technical field of offshore pile foundation protection, and discloses an offshore wind turbine pile foundation anti-scour device, comprising a fixed sleeve, a movable sleeve, and a spoiler. The fixed sleeve comprises a sleeve, a support plate, and a water baffle. The sleeve has a central hole for the pile foundation to pass through, and the support plate and the water baffle are arranged at opposite ends of the sleeve along the axial direction of the central hole. The support plate is used to support the seabed, and the water baffle is perpendicular to the centerline of the central hole. The movable sleeve is assembled on the outside of the sleeve and rotates around the centerline of the central hole. The spoiler is fixedly assembled on the outer wall of the movable sleeve away from the fixed sleeve. The spoiler is used to drive the movable sleeve to rotate around the fixed sleeve, and the maximum distance between the spoiler and the centerline of the central hole is greater than the maximum distance between the water baffle and the centerline of the central hole. By simultaneously reducing the effects of three factors on the pile foundation: downward water flow in front of the pile, water flow around the pile, and wake vortex disturbance behind the pile, the purpose of anti-scour is achieved, and the safety of the wind turbine pile foundation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore pile foundation protection, and in particular to an offshore wind power pile foundation anti-scour device. Background Art

[0002] Offshore wind power, characterized by abundant resources, long power generation periods, minimal land occupation, and suitability for large-scale development, is the latest frontier in global wind power development. However, the safety of pile foundations, the supporting structure of the entire wind turbine installation, is crucial to its proper operation.

[0003] After the wind farm is built, the pile foundation is subjected to the action of hydrodynamic loads such as waves and currents, and severe local scouring will occur around it. This will cause the water flow to be blocked by the foundation, forming vortices near the pile foundation, digging and washing away the mud and sand from near the foundation, forming scour pits, increasing the exposed area of ​​the wind power generation foundation, affecting the stability of the pile foundation, and in severe cases even causing the collapse of the entire wind turbine, restricting the development of offshore wind power. Summary of the Invention

[0004] The purpose of the present invention is to provide an offshore wind power pile foundation anti-scouring device to solve the problem in the prior art that the wind power pile foundation is affected by seawater scouring and the safety of the wind power pile foundation is affected.

[0005] In order to achieve the above-mentioned object, the present invention provides an offshore wind power pile foundation anti-scour device, comprising a fixed sleeve, a movable sleeve and a spoiler;

[0006] The fixing sleeve includes a sleeve, a support plate and a water retaining plate. The sleeve has a central hole for the pile foundation to pass through. The support plate and the water retaining plate are arranged at both ends of the sleeve along the axial direction of the central hole. The support plate is used to support the seabed. The water retaining plate is perpendicular to the center line of the central hole.

[0007] The movable sleeve is rotatably mounted on the outside of the sleeve around the center line of the center hole, and the spoiler is fixedly mounted on the outer wall of the movable sleeve facing away from the fixed sleeve. The spoiler is used to drive the movable sleeve to rotate around the fixed sleeve, and the maximum distance between the spoiler and the center line of the center hole is greater than the maximum distance between the water retaining plate and the center line of the center hole.

[0008] Preferably, the spoiler has an upper end surface close to the water baffle and a lower end surface close to the support plate, the upper end surface intersects with the lower end surface, the upper end surface and the lower end surface are both arc surfaces, and the center of the upper end surface and the center of the lower end surface are distributed at intervals along the axial direction of the center hole.

[0009] Preferably, the curvature of the upper end surface is greater than that of the lower end surface, and the intersection of the upper end surface and the lower end surface is located on a side of the axial center point of the movable sleeve close to the support plate.

[0010] Preferably, the spoiler further comprises a plate surface connected between the upper end surface and the lower end surface, and the plate surface is a plane coplanar with the center line of the central hole.

[0011] Preferably, the fixing sleeve further includes a transition section, which is connected between the water baffle and the sleeve, and the outer diameter of the transition section gradually decreases along the direction from the water baffle to the support plate.

[0012] Preferably, the water baffle and the support plate are both circular structures, the water baffle and the support plate are parallel to each other, and have the same radius as that of the support plate.

[0013] Preferably, the radius of the central hole is defined as R1, the radius of the water retaining plate is defined as R2, and R2=2R1.

[0014] Preferably, a bearing is further included, wherein the bearing is fixedly connected to the fixed sleeve and the movable sleeve, and at least two bearings are provided at intervals and in parallel along the axial direction of the center hole.

[0015] Compared with the prior art, the offshore wind power pile foundation anti-scour device according to the embodiment of the present invention has the following beneficial effects: the fixed sleeve is formed by a sleeve, a support plate and a water retaining plate, the pile foundation can pass through the central hole of the sleeve so that the fixed sleeve is fixed on the pile foundation, and the support plate is supported on the seabed to directly protect the sediment particles on the seabed around the pile foundation, and reduce the carrying effect of the water flow on the sediment; the water retaining plate on the top of the sleeve can block the downward water flow in front of the pile foundation, buffer the downward water flow, and thus reduce the disturbance of the downward water flow to the seabed soil and sediment; the movable sleeve is rotatably assembled on the outside of the sleeve, and the spoiler is fixedly connected to the movable sleeve. When the water flows through the pile foundation, it impacts the spoiler, and under the action of the water flow, the spoiler drives the movable sleeve to move. The movable sleeve rotates horizontally to reduce the impact of sediment carried by the water flow around the pile on the pile foundation; the spoiler rotates to the side of the pile foundation facing away from the water flow. At this time, the presence of the spoiler can disrupt the wake vortex on the rear side of the pile foundation, reducing the disturbing effect of the wake vortex behind the pile on the sediment; the maximum distance between the spoiler and the center line of the center hole is greater than the maximum distance between the water retaining plate and the center line of the center hole, so that the spoiler has a part located outside the water retaining plate, which increases the impact force of the water flow on the spoiler and the disturbing effect of the spoiler on the wake vortex behind the pile; by simultaneously reducing the impact of the three factors of the downward water flow in front of the pile, the water flow around the pile, and the wake vortex disturbance behind the pile on the pile foundation, the purpose of anti-scouring is achieved and the safety of the wind turbine pile foundation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the offshore wind power pile foundation anti-scour device of the present invention;

[0017] Figure 2 yes Figure 1 The assembly diagram of the offshore wind power pile foundation anti-scour device after omitting the movable sleeve and spoiler;

[0018] Figure 3 yes Figure 1 A schematic structural diagram of a fixing sleeve of an offshore wind power pile foundation anti-scour device;

[0019] Figure 4 yes Figure 1 Schematic diagram of the structure of the movable sleeve and spoiler of the offshore wind turbine pile foundation anti-scour device.

[0020] In the figure, 1. fixed sleeve, 11. sleeve, 111. center hole, 12. support plate, 13. water retaining plate, 14. transition section, 2. movable sleeve, 3. spoiler, 31. upper end surface, 32. lower end surface, 33. plate surface, 4. bearing, 5. pile foundation. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0022] A preferred embodiment of the offshore wind power pile foundation anti-scour device of the present invention is as follows: Figures 1 to 4 As shown, the offshore wind power pile foundation anti-scour device includes a fixed sleeve 1, a movable sleeve 2 and a spoiler 3.

[0023] The fixing sleeve 1 is used for fixed assembly on the pile foundation 5. The fixing sleeve 1 comprises a sleeve 11, a support plate 12, and a water retaining plate 13. The sleeve 11 is a rotating structure around the pile foundation 5 and has a central hole 111 for axial insertion of the pile foundation 5. The diameter of the central hole 111 is slightly larger than the diameter of the pile foundation 5 to ensure that the sleeve 11 can be inserted outside the pile foundation 5.

[0024] The support plate 12 and the water retaining plate 13 are arranged at both ends of the sleeve 11 along the axial direction of the center hole 111, wherein the support plate 12 is located at the bottom end of the sleeve 11 and the water retaining plate 13 is located at the top end of the sleeve 11. The support plate 12 is used to support on the seabed. The support plate 12 can directly protect the mud and sand particles on the seabed around the pile foundation 5 and reduce the carrying effect of the water flow on the mud and sand.

[0025] Water retaining plate 13 is perpendicular to the centerline of central hole 111, i.e., it is arranged along the radial plane of sleeve 11. When water strikes the front side of pile foundation 5, it flows downward, forming a downward flow, which impacts the seabed surrounding pile foundation 5. With water retaining plate 13 positioned at the top of sleeve 11, it blocks and buffers the downward flow, thereby reducing the disturbance of the seabed soil and sediment by the downward flow.

[0026] The movable sleeve 2 is assembled and rotated about the centerline of the central hole 111 on the outside of the sleeve 11. The spoiler 3 is fixedly connected to the movable sleeve 2 and mounted on the outer wall of the movable sleeve 2 facing away from the fixed sleeve 1. The spoiler 3 is used to drive the movable sleeve 2 to rotate about the fixed sleeve 1. When the water flow hits the pile foundation 5, it first hits the spoiler 3. Under the impact of the water flow, the spoiler 3 drives the movable sleeve 2 to rotate, acting as a buffer to the water flow, reducing the amount of sediment carried by the water flow around the pile foundation 5. After rotation, the spoiler 3 is located behind the pile foundation 5 in the direction of water flow, disrupting the trailing vortex and reducing the disturbing effect of the trailing vortex on the sediment.

[0027] The maximum distance between the spoiler 3 and the center line of the center hole 111 is greater than the maximum distance between the water retaining plate 13 and the center line of the center hole 111, that is, the spoiler 3 is at least partially located outside the spatial range covered by the water retaining plate 13 along the center line direction of the center hole 111, which increases the area of ​​the spoiler 3. The downward water flow in front of the pile and the water flow around the pile will impact the spoiler 3, thereby enhancing the disturbing effect of the spoiler 3 on the water flow around the pile and the tail vortex behind the pile.

[0028] The fixed sleeve 1 of the offshore wind power pile foundation anti-scour device is formed by a sleeve 11, a support plate 12 and a water retaining plate 13. The pile foundation 5 can pass through the center hole 111 of the sleeve 11 to fix the fixed sleeve 1 on the pile foundation 5. The support plate 12 is supported on the seabed to directly protect the sediment particles on the seabed around the pile foundation 5 and reduce the carrying effect of the water flow on the sediment; the water retaining plate 13 on the top of the sleeve 11 can block the downward water flow in front of the pile foundation 5, buffer the downward water flow, and thus reduce the disturbance of the downward water flow to the seabed soil and sediment; the movable sleeve 2 is rotatably assembled on the outside of the sleeve 11, and the spoiler 3 is fixedly connected to the movable sleeve 2. When the water flows through the pile foundation 5, it impacts the spoiler 3. Under the action of the water flow, the spoiler 3 drives the movable sleeve 2 to rotate horizontally. , reducing the impact of the pile foundation 5 on the sediment carried by the water flow around the pile; the spoiler 3 rotates to the side of the pile foundation 5 facing away from the water flow. At this time, the existence of the spoiler 3 can disrupt the tail vortex on the rear side of the pile foundation 5, and weaken the disturbing effect of the tail vortex behind the pile on the sediment; the maximum distance between the spoiler 3 and the center line of the center hole 111 is greater than the maximum distance between the center line of the water retaining plate 13 and the center line of the center hole 111, so that the spoiler 3 has a part located outside the water retaining plate 13, which increases the impact force of the water flow on the spoiler 3 and the disturbing effect of the spoiler 3 on the tail vortex behind the pile; by simultaneously weakening the influence of the three factors of the downward water flow in front of the pile, the water flow around the pile, and the tail vortex disturbance behind the pile on the pile foundation 5, the purpose of anti-scouring is achieved and the safety of the wind turbine pile foundation 5 is improved.

[0029] Preferably, the spoiler 3 has an upper end surface 31 close to the water retaining plate 13 and a lower end surface 32 close to the support plate 12, the upper end surface 31 and the lower end surface 32 intersect, the upper end surface 31 and the lower end surface 32 are both arc surfaces, and the center of the upper end surface 31 and the center of the lower end surface 32 are distributed at intervals along the axial direction of the center hole 111.

[0030] The center of the upper end face 31 and the center of the lower end face 32 of the spoiler 3 are spaced apart along the axial direction of the center hole 111, so that the centers of the upper end face 31 and the end face are both located on the straight line where the generatrix of the sleeve 11 is located. The upper end face 31 and the lower end face 32 are both tangent arcs. The transition between the upper end face 31 and the lower end face 32 of the spoiler 3 is smoother, reducing the location of sudden shape changes on the spoiler 3, and better disturbing the trailing vortex behind the pile. In this embodiment, the distance between the intersection of the upper end face 31 and the lower end face 32 and the center line of the center hole 111 is the maximum distance between the spoiler 3 and the center line of the center hole 111.

[0031] Preferably, the curvature of the upper end surface 31 is greater than that of the lower end surface 32 , and the intersection of the upper end surface 31 and the lower end surface 32 is located on the side of the axial center point of the movable sleeve 2 close to the support plate 12 .

[0032] The trailing vortex behind the pile is primarily formed by the downward flow and the surrounding water flow around the pile. The overall direction of the water flow is inclined downward. When the curvature of the upper end surface 31 is greater than that of the lower end surface 32, the upper end surface 31 has a larger area and a better disturbing effect on the water flow. In this embodiment, the intersection between the upper end surface 31 and the end surface is located at a position four-fifths of the way along the generatrix of the movable sleeve 2 on the side closest to the support plate 12.

[0033] Preferably, the spoiler 3 further includes a plate surface 33 connected between the upper end surface 31 and the lower end surface 32 , and the plate surface 33 is a plane coplanar with the center line of the central hole 111 .

[0034] The plate surface 33 is a planar structure and is coplanar with the center line of the center hole 111. The spoiler 3 is placed vertically as a whole, and the spoiler 3 coincides with the busbar of the movable sleeve 2 inwardly. Under the impact of the water flow, the spoiler 3 drives the movable sleeve 2 to rotate more obviously.

[0035] Preferably, the fixing sleeve 1 further includes a transition section 14 , which is connected between the water baffle 13 and the sleeve 11 , and the outer diameter of the transition section 14 gradually decreases along the direction from the water baffle 13 to the support plate 12 .

[0036] The fixed sleeve 1 includes a transition section 14 between the water baffle 13 and the sleeve 11. This section connects the water baffle 13 to the sleeve 11, increasing the structural strength of the connection between the two, preventing stress concentration that could damage the water baffle 13. The outer diameter of the transition section 14 gradually decreases from the water baffle 13 toward the support plate 12, matching the stress distribution when the water baffle 13 is impacted by water flow, resulting in effective force transmission. In this embodiment, the outer wall of the transition section 14 is curved to reduce stress concentration points.

[0037] Preferably, the water baffle 13 and the support plate 12 are both circular structures, the water baffle 13 and the support plate 12 are parallel to each other, and the water baffle 13 and the support plate 12 have the same radius.

[0038] The water retaining plate 13 and the supporting plate 12 are parallel to each other and have the same radius, so they can be manufactured simultaneously, which is simple, convenient and low-cost.

[0039] Preferably, the radius of the central hole 111 is defined as R1, the radius of the water retaining plate 13 is defined as R2, and R2=2R1.

[0040] The radius of the water retaining plate 13 is twice the radius of the center hole 111, and the radius of the support plate 12 is also twice the radius of the center hole 111. The radius of the center hole 111 is basically equal to the radius of the pile foundation 5. The water retaining plate and the support plate 12 effectively block the downward water flow within this range and protect the sediment particles on the seabed.

[0041] Normally, when water flows impact the pile foundation 5, the impact range on the seabed is mainly within a radius twice around the pile foundation 5. The radius of the water retaining plate 13 and the support plate 12 is twice the radius of the pile foundation 5. While effectively protecting the seabed, it can avoid increasing costs by being too large.

[0042] Preferably, a bearing 4 is further included, which is fixedly connected to the fixed sleeve 1 and the movable sleeve 2 , and at least two bearings 4 are provided at intervals and in parallel along the axial direction of the center hole 111 .

[0043] The fixed sleeve 1 and the movable sleeve 2 are rotatably assembled via at least two bearings 4, which can reduce the resistance of the movable sleeve 2 during rotation. In this embodiment, there are three bearings 4, which are evenly spaced along the axial direction of the sleeve 11.

[0044] Preferably, a permanent magnet is further provided in the movable sleeve 2, and an electric wire is provided in the sleeve 11 of the fixed sleeve 1, and the electric wire is connected to the outside. The water flow impacts the spoiler 3 and drives the movable sleeve 2 to rotate. Under the action of electromagnetic induction, current is generated in the electric wire to realize small-scale power generation.

[0045] In summary, an embodiment of the present invention provides an offshore wind power pile foundation anti-scour device, wherein the fixed sleeve is formed by a sleeve, a support plate and a water retaining plate. The pile foundation can pass through the center hole of the sleeve so that the fixed sleeve is fixed on the pile foundation. The support plate is supported on the seabed to directly protect the mud and sand particles on the seabed around the pile foundation, and reduce the carrying effect of the water flow on the mud and sand; the water retaining plate on the top of the sleeve can block the downward water flow in front of the pile foundation, buffer the downward water flow, and thus reduce the disturbance of the downward water flow to the seabed soil and mud; the movable sleeve is rotatably assembled on the outside of the sleeve, and the spoiler is fixedly connected to the movable sleeve. When the water flows through the pile foundation, it impacts the spoiler, and under the action of the water flow, the spoiler drives the movable sleeve to rotate horizontally. The spoiler is rotated to the side of the pile foundation facing away from the water flow. At this time, the existence of the spoiler can disrupt the wake vortex on the rear side of the pile foundation, reducing the disturbing effect of the wake vortex behind the pile on the sediment. The maximum distance between the spoiler and the center line of the center hole is greater than the maximum distance between the water retaining plate and the center line of the center hole, so that the spoiler has a part located outside the water retaining plate, which increases the impact force of the water flow on the spoiler and the disturbing effect of the spoiler on the wake vortex behind the pile. By simultaneously reducing the influence of the three factors of the downward water flow in front of the pile, the water flow around the pile, and the wake vortex disturbance behind the pile on the pile foundation, the purpose of anti-scouring is achieved and the safety of the wind turbine pile foundation is improved.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An offshore wind power pile foundation anti-scour device, characterized in that: It comprises a fixed sleeve (1), a movable sleeve (2) and a spoiler (3); The fixing sleeve (1) comprises a sleeve (11), a support plate (12) and a water retaining plate (13); the sleeve (11) has a central hole (111) for the pile foundation (5) to pass through; the support plate (12) and the water retaining plate (13) are arranged at both ends of the sleeve (11) along the axial direction of the central hole (111) at intervals; the support plate (12) is used for supporting on the seabed; the water retaining plate (13) is perpendicular to the center line of the central hole (111); The movable sleeve (2) is assembled on the outside of the sleeve (11) so as to rotate around the center line of the center hole (111); the spoiler (3) is fixedly assembled on the outer wall of the movable sleeve (2) away from the fixed sleeve (1); the spoiler (3) is used to drive the movable sleeve (2) to rotate around the fixed sleeve (1); the maximum distance between the spoiler (3) and the center line of the center hole (111) is greater than the maximum distance between the water retaining plate (13) and the center line of the center hole (111); The spoiler (3) has an upper end surface (31) close to the water retaining plate (13) and a lower end surface (32) close to the support plate (12), the upper end surface (31) and the lower end surface (32) intersect, the upper end surface (31) and the lower end surface (32) are both arc surfaces, the center of the upper end surface (31) and the center of the lower end surface (32) are spaced apart along the axial direction of the center hole (111), the curvature of the upper end surface (31) is greater than the curvature of the lower end surface (32), the intersection of the upper end surface (31) and the lower end surface (32) is located on the side of the axial center point of the movable sleeve (2) close to the support plate (12), and the spoiler (3) further has a plate surface (33) connected between the upper end surface (31) and the lower end surface (32), and the plate surface (33) is a plane coplanar with the center line of the center hole (111).

2. The offshore wind power pile foundation anti-scour device according to claim 1, characterized in that: The fixing sleeve (1) further comprises a transition section (14), wherein the transition section (14) is connected between the water baffle (13) and the sleeve (11), and the outer diameter of the transition section (14) gradually decreases along the direction from the water baffle (13) to the support plate (12).

3. The offshore wind power pile foundation anti-scour device according to claim 1, characterized in that: The water baffle (13) and the support plate (12) are both circular structures, the water baffle (13) and the support plate (12) are parallel to each other, and the water baffle (13) and the support plate (12) have the same radius.

4. The offshore wind power pile foundation anti-scour device according to claim 3, characterized in that: The radius of the center hole (111) is defined as R1, the radius of the water retaining plate (13) is defined as R2, and R2=2R1.

5. The offshore wind power pile foundation anti-scour device according to claim 1, characterized in that: It also includes a bearing (4), wherein the bearing (4) is fixedly connected to the fixed sleeve (1) and the movable sleeve (2), and at least two bearings (4) are provided at intervals and in parallel along the axial direction of the central hole (111).

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