Offshore wind power pile foundation scour prevention structure

Abstract

The application discloses a scouring prevention structure of an offshore wind power pile foundation and relates to the technical field of offshore wind power pile foundations.The scouring prevention structure comprises a steel plate, a plurality of steel plates are arranged in a cylindrical shape, fixing assemblies are symmetrically arranged on both sides of the steel plate, the fixing assemblies are fixedly connected to the surface of a center column, the other side of the fixing assemblies is fixedly connected to the surface of the steel plate, a connecting assembly is arranged in the cylindrical structure surrounded by the plurality of steel plates, the two sides of the connecting assembly are fixedly connected to the side of the center column and the side pile, which are close to each other, an inner supporting assembly is arranged in the cylindrical structure surrounded by the plurality of steel plates, and the inner supporting assembly is fixedly connected to the surface of the center column.Through the mode of cooperation of a plurality of side piles and the connection of the steel plate for enhancing the rigidity, the bearing capacity and the overall stability of the foundation are remarkably improved, the side pile and the steel plate are connected to form a closed annular space, the center column is surrounded in the annular space, and the center column is prevented from being scoured.

Description

TECHNICAL FIELD

[0001] The present application relates to the offshore wind power pile foundation technical field, and in particular to a kind of anti-scouring structure of offshore wind power pile foundation. BACKGROUND

[0002] It is clearly stipulated in relevant specification at home and abroad that the total allowable rotation angle of wind power foundation at mud surface is 0.5° under general circumstances, wherein the installation allowable error of wind turbine is 0.25°, and the limit of permanent cumulative rotation at mud surface is 0.25°. With the continuous increase of power of single wind turbine at sea, the wind load borne by wind turbine structure also increases. Although the traditional single pile foundation performs excellently in vertical bearing capacity, it is insufficient in bending stiffness when facing natural environmental load such as strong wind, sea wave or earthquake, which easily causes large lateral displacement and horizontal rotation angle, affects the stability of wind turbine, and even leads to shutdown. In addition, the existence of single pile foundation will disturb local water flow field, causing large bed shear force of water flow and vortex, resulting in sediment loss and forming local scouring. Local scouring will reduce the horizontal bearing capacity of pile foundation and the natural vibration frequency of wind turbine structure, threatening the structural stability of offshore wind turbine and affecting the normal operation of wind turbine. How to improve the bending stiffness of foundation and solve the scouring problem of foundation is a difficult problem faced by the development of offshore wind turbine.

[0003] In recent years, pile barrel foundation has been proposed as a scheme, which improves the bearing capacity and stability by increasing the bottom area of foundation and the joint action of multiple piles. Although the bending performance of pile barrel foundation is improved, it has great difficulty in construction under negative pressure, high cost and long cycle, especially in complex marine geological environment, and the construction effect is often limited. In view of the insufficient bending stiffness and anti-scouring capacity of single pile foundation and the limitation of great construction difficulty and high cost of pile barrel foundation, the present application proposes a new type of multi-pile foundation structure. Compared with the traditional multi-pile foundation connected by horizontal rods, the present application aims to improve the overall stiffness by optimizing the design, solve the scouring problem of foundation, improve the stability, economy and efficiency of offshore wind power engineering, and meet the needs of more extensive sea conditions. Therefore, the present application proposes a kind of anti-scouring structure of offshore wind power pile foundation. SUMMARY

[0004] To solve the above technical problems, the present application provides a kind of anti-scouring structure of offshore wind power pile foundation, comprising:

[0005] A center column connected with the bottom of wind turbine tower, and a plurality of edge piles arranged around the center column.

[0006] A fence mechanism sleeved on the outside of the center column, and the center column and the edge piles are fixedly connected through the fence mechanism.

[0007] The fence mechanism comprises:

[0008] Steel plates are arranged at intervals between two adjacent center columns, and a plurality of steel plates are arranged to form a cylindrical shape;

[0009] Fixing assemblies are symmetrically arranged on both sides of the steel plates, and the fixing assemblies are fixedly connected to the surface of the center column and fixedly connected to the surface of the steel plate away from the center column;

[0010] Connecting assemblies are arranged inside the cylindrical structure formed by the plurality of steel plates, and the two sides of the connecting assemblies are fixedly connected to the side of the center column and the side of the pile close to each other;

[0011] The inner support assembly is arranged inside the cylindrical structure formed by the plurality of steel plates, and the inner support assembly is fixedly connected to the surface of the center column;

[0012] During construction, the connecting assembly is fixedly connected to the surface of the center column, then the pile is inserted into the seabed, then the other side of the connecting assembly is fixed to the pile, and the plurality of piles are sequentially fixed. The fixing assembly is pre-fixed to the surface of the pile, and the plurality of steel plates are sequentially inserted into the intervals between the adjacent piles. The steel plates are inserted into the seabed, and then the steel plates are fixed by the fixing assembly. Finally, the inner support assembly is inserted into the cylindrical space formed by the plurality of steel plates, and then the inner support assembly is started. The inner support assembly clamps the surface of the connecting assembly, and the inner support assembly abuts against the inner side of the steel plate. By means of the cooperation of the plurality of piles and the connection of the steel plates to enhance the rigidity, the bearing capacity and overall stability of the foundation are significantly improved. The pile and the steel plate form a closed circular space to surround the center column, so that the center column is prevented from being washed away. The key components such as the center column, the pile, the steel plate, the fixing assembly, the connecting assembly, and the inner support assembly are prefabricated in the factory. The installation process is more intuitive and convenient, which greatly reduces the construction difficulty and labor intensity, and shortens the construction period.

[0013] Further, the fixing assembly is provided with a plurality of groups, and the plurality of groups of fixing assemblies are uniformly distributed along the circumference of the center column. Each group of fixing assemblies is symmetrically arranged with the steel plate as the center. The connecting assemblies are uniformly distributed along the circumference of the center column, and each group of connecting assemblies is uniformly distributed along the axis of the center column. A plurality of fixing assemblies are arranged to fix the steel plates, and a plurality of groups of connecting assemblies are arranged to fix the plurality of piles on the surface of the center column.

[0014] Further, the fixing assembly comprises mounting holes symmetrically arranged on both sides of the steel plate, the surface of the piling post is fixedly connected with mounting strips, two mounting strips are symmetrically arranged around the steel plate, and the side of the two mounting strips close to each other is arranged in the arc of the steel plate, the mounting hole is provided with a fixing bolt in the inside, the fixing bolt is in sliding connection with the inner side of the mounting hole, the upper part of the steel plate is fixedly connected with the two mounting strips through the fixing bolt, and the two mounting strips arranged in the arc of the steel plate can ensure the smooth sliding of the steel plate when the steel plate is inserted into the inside of the two mounting strips, avoid the deformation of the steel plate, ensure that the plurality of steel plates form a regular cylindrical structure, and further ensure the enclosing effect.

[0015] Further, the connecting assembly comprises a horizontal rod arranged at the interval between the center column and the piling post, the two ends of the horizontal rod are provided with connecting flanges, and the sides of the two connecting flanges away from each other are fixedly connected with the surfaces of the center column and the piling post respectively, and the two connecting flanges are pre-welded on the surfaces of the center column and the piling post respectively, which is more intuitive and convenient during construction.

[0016] Further, the two ends of the horizontal rod are provided with connecting bolts, and the connecting bolts are uniformly distributed on the circumference of the horizontal rod, and the two connecting flanges are fixedly installed on the two ends of the horizontal rod through the connecting bolts, and the detachable installation mode can conveniently replace the damaged parts.

[0017] Further, the two ends of the horizontal rod are fixedly connected with limiting columns, and the ends of the two limiting columns away from each other extend into the inside of the two connecting flanges, and the surface of the limiting column is in sliding connection with the inner side of the connecting flange, the limiting column is inserted into the inside of the connecting flange, which can limit the two before tightening the connecting bolt, achieve the pre-positioning effect, avoid the inclination of the horizontal rod during construction, and the embedding of the limiting column can support the connecting flange and the horizontal rod after part of the connecting bolts fall off, avoid the inclination of the two, and avoid the breakage of the remaining connecting bolts.

[0018] Further, the inner support assembly comprises two top plates symmetrically arranged at the top of the center column, and the side close to each other of the two top plates is serrated and engaged, and the two top plates together form a ring plate structure, the side close to the steel plate of the top plate is fixedly connected with a rod body, the rod body is uniformly distributed on the circumference of the two top plates, the surface of the rod body is fixedly connected with a limiting plate, the side close to the steel plate of the limiting plate is fixedly connected with a T-shaped plate, and the side away from the limiting plate of the T-shaped plate is arranged in the arc of the steel plate and is sequentially inserted into the two top plates, the two top plates are engaged with each other to form a ring plate structure, the cylindrical structure surrounded by the steel plates is closed, the juvenile marine organisms are prevented from entering, the barnacles and the like are prevented from adhering to the surface of the center column, and the center column is prevented from being damaged, the T-shaped plate can support the inner side of the steel plate, the deformation of the steel plate caused by the erosion of seawater is avoided, the stability of the cylindrical structure is maintained, the deformation of the steel plate is avoided, unnecessary vibration is caused when the seawater flows through, the two top plates engaged with each other are more closely engaged, the deviation is avoided, the T-shaped plate can be stably supported on the inner side of the steel plate, and the stability of the inner support effect is ensured.

[0019] Further, the V-shaped rod is arranged through the web of the T-shaped plate, the surface of the V-shaped rod is fixedly connected with the inner side of the T-shaped plate, the two ends of the V-shaped rod are fixedly connected with the side away from the steel plate of the flange, and a plurality of V-shaped rods are arranged, the V-shaped rods arranged through the T-shaped plate form a triangular structure on the two sides of the T-shaped plate, the flange of the T-shaped plate can bear greater pressure during the inner support, the deformation of the flange of the T-shaped plate is avoided, and the support effect of the T-shaped plate on the arc surface of the steel plate is ensured.

[0020] Further, the horizontal rod is symmetrically provided with clamping plates on the two sides, the clamping plates are arranged at the interval between adjacent two limiting plates, the side away from each other of the two clamping plates is fixedly connected with an extension rod, the output end of the extension rod is fixedly connected with the clamping plate, the extension rod is embedded in the clamping plate, the surface of the extension rod is fixedly connected with the inner side of the clamping plate, the output end of the extension rod is fixedly connected with the inner side of the clamping plate, the extension rod is started, the output end of the extension rod drives the clamping plate to move, the two clamping plates clamp the horizontal rod, so that the inner support assembly and the connecting assembly are fixedly connected to form a whole, the ring cylindrical structure surrounded by the steel plates is supported together, and better anti-erosion effect is obtained.

[0021] The application has the beneficial effects that:

[0022] 1、The present application sets up the fender mechanism, through the mode of the cooperation of the bearing of the plurality of edge piles and the rigidity enhancement of the steel plate connection, significantly improves the bearing capacity and overall stability of the foundation, the edge pile and the steel plate connection form a closed circular ring space, which surrounds the center column, avoids the center column from being anti-scour, the key components such as the center column, the edge pile, the steel plate, the fixing assembly, the connecting assembly and the inner support assembly are prefabricated in the factory, the installation process is more intuitive and convenient, the construction difficulty and labor intensity are greatly reduced, and the construction period is shortened.

[0023] 2、The present application sets up the fixing assembly, two installation strips are arranged in the arc of the steel plate, when the steel plate is inserted into the two installation strips, the smooth sliding of the steel plate can be ensured, the deformation of the steel plate can be avoided, the plurality of steel plates can be surrounded to form a regular cylindrical structure, and then the fender effect can be ensured.

[0024] 3、The present application sets up the connecting assembly, two connecting flanges are respectively welded on the surface of the center column and the edge pile in advance, the installation process is more intuitive and convenient, the detachable installation mode can conveniently replace the damaged parts, the limiting column is inserted into the connecting flange, the two can be limited before the connecting bolt is tightened, the predetermined positioning effect is achieved, the horizontal rod is prevented from being inclined during construction, the embedding of the limiting column can support the connecting flange and the horizontal rod after part of the connecting bolt falls off, the inclination of the two is avoided, and the breakage of the remaining connecting bolt is avoided.

[0025] 4、The present application sets up the inner support assembly, two top plates are engaged with each other to form a ring plate structure, the cylindrical structure surrounded by the plurality of steel plates is closed, marine biological seedlings are prevented from entering, and barnacles and the like are prevented from adhering to the surface of the center column, the T-shaped plate can support the inner side of the steel plate, deformation of the steel plate caused by the scour of seawater is avoided, the stability of the cylindrical structure is maintained, deformation of the steel plate is avoided, unnecessary vibration is caused when seawater flows, the two top plates engaged in a sawtooth shape are more tightly engaged with each other, deviation is avoided, the T-shaped plate can be stably supported on the inner side of the steel plate, the stability of the inner support effect is ensured, the V-shaped rod is arranged in penetration, the two sides of the T-shaped plate form a triangular structure, the flange of the T-shaped plate can bear greater pressure during the inner support, deformation of the flange of the T-shaped plate is avoided, and the support effect of the T-shaped plate on the arc surface of the steel plate is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the anti-scour structure of the offshore wind power pile foundation of the present application;

[0027] Figure 2 It is a structural schematic view of the fender mechanism of the present application;

[0028] Figure 3 It is a structural schematic view of the fixing assembly of the present application;

[0029] Figure 4 For the application Figure 3 of part A is enlarged view;

[0030] Figure 5 For the application connection assembly structure diagram;

[0031] Figure 6 For the application connection assembly cross section structure diagram;

[0032] Figure 7 For the application inner support assembly structure diagram;

[0033] Figure 8 For the application clamping plate structure diagram.

[0034] In the figure: 1, the center column; 2, the side stake; 3, the enclosure mechanism; 31, the steel plate; 32, the fixed assembly; 321, the mounting hole; 322, the mounting strip; 323, the fixed bolt; 33, the connection assembly; 331, the horizontal rod; 332, the connection flange; 333, the connection bolt; 334, the limiting column; 34, the inner support assembly; 341, the top plate; 342, the rod body; 343, the limiting plate; 344, the T-shaped plate; 345, the V-shaped rod; 346, the telescopic rod; 347, the clamping plate. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the drawings and specific embodiments. The embodiments of the application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

[0036] Embodiment 1, please refer to Figures 1-6 , the application is a kind of offshore wind power pile scouring structure, comprising:

[0037] Center column 1, the center column 1 is connected with the bottom of wind turbine tower, and the periphery of center column 1 is arranged with a plurality of side stakes 2;

[0038] Enclosure mechanism 3, the enclosure mechanism 3 is sleeved on the outside of center column 1, and the center column 1 and the side stake 2 are fixedly connected through the enclosure mechanism 3;

[0039] Among them, the enclosure mechanism 3 comprises:

[0040] Steel plate 31, the steel plate 31 is arranged at the interval of adjacent two center columns 1, and the steel plate 31 is provided with a plurality of steel plates 31, and the plurality of steel plates 31 are surrounded to form a cylindrical shape;

[0041] The fixing assembly 32 is symmetrically arranged on both sides of the steel plate 31, is fixedly connected to the surface of the center column 1, and is fixedly connected to the surface of the steel plate 31 away from the center column 1.

[0042] The connecting assembly 33 is arranged inside the cylindrical structure surrounded by the steel plates 31, and the two sides of the connecting assembly 33 are fixedly connected to the side of the center column 1 and the side of the edge pile 2 close to each other.

[0043] The inner supporting assembly 34 is arranged inside the cylindrical structure surrounded by the steel plates 31, and is fixedly connected to the surface of the center column 1.

[0044] During construction, the connecting assembly 33 is first fixedly connected to the surface of the center column 1, then the edge pile 2 is inserted into the seabed, then the other side of the connecting assembly 33 is fixed to the edge pile 2, and then the edge piles 2 are sequentially fixed, the fixing assembly 32 is pre-fixed to the surface of the edge pile 2, the steel plates 31 are sequentially inserted into the space between adjacent edge piles 2, the steel plates 31 are inserted into the seabed, then the steel plates 31 are fixed by the fixing assembly 32, and finally the inner supporting assembly 34 is inserted into the cylindrical space surrounded by the steel plates 31, then the inner supporting assembly 34 is started, the inner supporting assembly 34 clamps the surface of the connecting assembly 33, and the inner supporting assembly 34 abuts against the inner side of the steel plate 31. By the way of cooperation of the multiple edge piles 2 and the connection of the steel plates 31 to enhance the rigidity, the bearing capacity and overall stability of the foundation are significantly improved. The edge pile 2 and the steel plate 31 form a closed annular space to surround the center column 1, so that the center column 1 is prevented from being scoured. The key components such as the center column 1, the edge pile 2, the steel plate 31, the fixing assembly 32, the connecting assembly 33, and the inner supporting assembly 34 are pre-fabricated in the factory, the installation process is more intuitive and convenient, the construction difficulty and labor intensity are greatly reduced, and the construction period is shortened.

[0045] The fixing assembly 32 is arranged in several groups, and the fixing assemblies 32 in the several groups are uniformly distributed along the circumference of the center column 1. Each group of fixing assemblies 32 is symmetrically arranged with the steel plate 31 as the center. The connecting assembly 33 is uniformly distributed in several groups along the circumference of the center column 1, and each group of connecting assemblies 33 is uniformly distributed along the axis of the center column 1. The several fixing assemblies 32 respectively fix the steel plates 31, and the several groups of connecting assemblies 33 respectively fix the edge piles 2 on the surface of the center column 1.

[0046] The fixing assembly 32 comprises mounting holes 321 symmetrically arranged on both sides of the steel plate 31, the surface of the pile 2 is fixedly connected with mounting strips 322, the mounting strips 322 are symmetrically arranged with the steel plate 31 as the center, the two mounting strips 322 are arranged in close contact with the curvature of the steel plate 31, the mounting holes 321 are internally provided with fixing bolts 323, the fixing bolts 323 are in sliding connection with the inner side of the mounting holes 321, the upper part of the steel plate 31 is fixedly connected with the two mounting strips 322 through the fixing bolts 323, the two mounting strips 322 arranged in close contact with the curvature of the steel plate 31 can ensure the smooth sliding of the steel plate 31 when the steel plate 31 is inserted into the two mounting strips 322, avoid deformation of the steel plate 31, ensure that the plurality of steel plates 31 form a regular cylindrical structure, and further ensure the blocking effect.

[0047] The connecting assembly 33 comprises horizontal rods 331 arranged at intervals between the center column 1 and the pile 2, the two ends of the horizontal rod 331 are provided with connecting flanges 332, the two connecting flanges 332 are fixedly connected to the surfaces of the center column 1 and the pile 2 respectively, and the two connecting flanges 332 are pre-welded to the surfaces of the center column 1 and the pile 2 respectively, which is more intuitive and convenient during construction.

[0048] The two ends of the horizontal rod 331 are provided with connecting bolts 333, the connecting bolts 333 are uniformly distributed along the circumference of the horizontal rod 331, the two connecting flanges 332 are fixedly installed at the two ends of the horizontal rod 331 through the connecting bolts 333, and the detachable installation mode can conveniently replace the damaged parts.

[0049] The two ends of the horizontal rod 331 are fixedly connected with limiting columns 334, the two limiting columns 334 extend into the two connecting flanges 332 respectively, the surface of the limiting column 334 is in sliding connection with the inner side of the connecting flange 332, the limiting column 334 is inserted into the connecting flange 332, which can limit the two before the connecting bolt 333 is tightened, achieve the positioning effect, avoid the inclination of the horizontal rod 331 during construction, and the embedding of the limiting column 334 can support the connecting flange 332 and the horizontal rod 331 after some connecting bolts 333 fall off, avoid the inclination of the two, and avoid the breakage of the remaining connecting bolts 333.

[0050] Embodiment 2, please refer to Figures 1-8The inner support assembly 34 comprises two top plates 341 symmetrically arranged at the top of the center column 1, and the side close to each other of the two top plates 341 is serrated and engaged, and the two top plates 341 jointly form a ring plate structure, the side close to the steel plate 31 of the top plate 341 is fixedly connected with a rod body 342, the rod body 342 is uniformly distributed on the circumference of the two top plates 341, the surface of the rod body 342 is fixedly connected with a limiting plate 343, the side close to the steel plate 31 of the limiting plate 343 is fixedly connected with a T-shaped plate 344, and the side away from the limiting plate 343 of the T-shaped plate 344 is arranged in the arc of the steel plate 31 and is sequentially inserted into the two top plates 341, the two top plates 341 are engaged with each other to form a ring plate structure, the cylindrical structure surrounded by the plurality of steel plates 31 is closed, and the entry of marine biological seedlings is avoided, so that the barnacles and the like are avoided to be attached to the surface of the center column 1, and the damage of the center column 1 is avoided, the T-shaped plate 344 can support the inner side of the steel plate 31, the deformation of the steel plate 31 caused by the erosion of seawater is avoided, the stability of the cylindrical structure is maintained, the deformation of the steel plate 31 is avoided, unnecessary vibration is caused when seawater flows through, and the serrated engagement of the two top plates 341 is more closely engaged, the deviation is avoided, the T-shaped plate 344 can be stably supported on the inner side of the steel plate 31, and the stability of the inner support effect is ensured.

[0051] The V-shaped rod 345 is arranged through the web of the T-shaped plate 344, the surface of the V-shaped rod 345 is fixedly connected with the inner side of the T-shaped plate 344, the two ends of the V-shaped rod 345 are fixedly connected with the side away from the steel plate 31 of the flange, and a plurality of V-shaped rods 345 are arranged, the V-shaped rods 345 arranged through the T-shaped plate 344 can form a triangular structure on the two sides of the T-shaped plate 344, the flange of the T-shaped plate 344 can bear greater pressure during the inner support, the deformation of the flange of the T-shaped plate 344 is avoided, and the support effect of the T-shaped plate 344 on the arc surface of the steel plate 31 is ensured.

[0052] The two sides of the horizontal rod 331 are symmetrically provided with clamping plates 347, the clamping plates 347 are arranged at the interval between the adjacent two limiting plates 343, the side away from each other of the two clamping plates 347 is fixedly connected with a telescopic rod 346, the output end of the telescopic rod 346 is fixedly connected with the clamping plate 347, the telescopic rod 346 is embedded in the clamping plate 347, the surface of the telescopic rod 346 is fixedly connected with the inner side of the clamping plate 347, the output end of the telescopic rod 346 is fixedly connected with the inner side of the clamping plate 347, the telescopic rod 346 is started, the output end of the telescopic rod 346 drives the clamping plate 347 to move, the two clamping plates 347 clamp the horizontal rod 331, so as to realize fixation, the inner support assembly 34 and the connecting assembly 33 are connected into a whole, and the ring cylindrical structure surrounded by the steel plate 31 is supported together to obtain better anti-erosion effect.

[0053] During construction, the two connecting flanges 332 are welded on the surface of the center column 1 and the side stake 2 in advance, then the horizontal rod 331 is fixed on the center column 1 through connecting bolts 333, the side stake 2 is inserted into the seabed, and the side stake 2 is fixed on the horizontal rod 331 through bolts, a plurality of side stakes 2 are fixed through the horizontal rod 331 in turn, a plurality of steel plates 31 are inserted into the interval between adjacent side stakes 2 in turn, the steel plates 31 are inserted into the seabed, the steel plates 31 pass through the two mounting strips 322, and then are fixed through the fixing bolts 323, a plurality of steel plates 31 are fixed in turn, the steel plates 31 are surrounded to form a cylindrical structure, then two top plates 341 are inserted in turn, the two top plates 341 are engaged with each other, the T-shaped plate 344 supports the inner side of the steel plate 31, the telescopic rod 346 is started, the output end of the telescopic rod 346 drives the clamping plate 347 to move, the two clamping plates 347 clamp the horizontal rod 331, and the fixing is realized. The inner supporting assembly 34 and the connecting assembly 33 are connected into a whole.

[0054] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art and the related fields without creative work should belong to the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to the conventional means in the art, unless specifically described and limited.

Claims

1. An erosion protection structure for an offshore wind pile foundation, characterized in that, The utility model relates to a wind turbine tower structure, including: a central column (1) connected to the bottom of the wind turbine tower, a plurality of edge piles (2) arranged around the central column (1); a fence mechanism (3) sleeved on the outer side of the central column (1), and the central column (1) and the edge piles (2) are fixedly connected through the fence mechanism (3); wherein the fence mechanism (3) comprises: a steel plate (31) arranged at the interval between two adjacent edge piles (2), and a plurality of steel plates (31) are arranged, and the plurality of steel plates (31) form a cylindrical shape; a fixing assembly (32) symmetrically arranged on both sides of the steel plate (31), the fixing assembly (32) is fixedly connected to the surface of the edge pile (2), and the side of the fixing assembly (32) away from the edge pile (2) is fixedly connected to the surface of the steel plate (31); a connecting assembly (33) arranged inside the cylindrical structure surrounded by the plurality of steel plates (31), and the two sides of the connecting assembly (33) are fixedly connected to the side of the central column (1) and the edge pile (2) close to each other; an inner support assembly (34) arranged inside the cylindrical structure surrounded by the plurality of steel plates (31), and the inner support assembly (34) is fixedly connected to the surface of the central column (1); the inner support assembly (34) comprises a top plate (341), two top plates (341) are symmetrically arranged on the top of the central column (1), and the side of the two top plates (341) close to each other is serrated and engaged, the two top plates (341) jointly form a ring plate structure, the side of the top plate (341) close to the steel plate (31) is fixedly connected with a rod body (342), the rod body (342) is uniformly distributed with a plurality of rod bodies (342) along the circumference of the two top plates (341), the surface of the rod body (342) is fixedly connected with a limiting plate (343), the side of the limiting plate (343) close to the steel plate (31) is fixedly connected with a T-shaped plate (344), and the side of the T-shaped plate (344) away from the limiting plate (343) is arranged in the arc of the steel plate (31); a V-shaped rod (345) is arranged through the web of the T-shaped plate (344), and the surface of the V-shaped rod (345) is fixedly connected with the inner side of the T-shaped plate (344), the two ends of the V-shaped rod (345) are fixedly connected with the side of the flange of the T-shaped plate (344) away from the steel plate (31), and the V-shaped rod (345) is provided with a plurality of V-shaped rods (345); the connecting assembly (33) comprises a horizontal rod (331) arranged at the interval between the central column (1) and the edge pile (2). Two sides of the horizontal rod (331) are symmetrically provided with clamping plates (347), the clamping plates (347) are arranged at intervals between two adjacent limiting plates (343), and the side away from each other of the two clamping plates (347) is fixedly connected with an extension rod (346), the output end of the extension rod (346) is fixedly connected with the clamping plate (347), the extension rod (346) is inlaid in the limiting plate (343), and the surface of the extension rod (346) is fixedly connected with the inner side of the clamping plate (347).

2. A scour protection structure for an offshore wind turbine pile foundation according to claim 1, characterized in that: The fixing assembly (32) is provided with a plurality of groups, and the plurality of groups of fixing assemblies (32) are uniformly distributed along the circumference of the center column (1), each group of fixing assemblies (32) is symmetrically arranged with the steel plate (31) as the center, the connecting assembly (33) is uniformly distributed along the circumference of the center column (1) in several groups, and each group of connecting assemblies (33) is uniformly distributed along the axis of the center column (1) in several groups.

3. A scour protection structure for an offshore wind turbine pile foundation according to claim 2, characterized in that: The fixing assembly (32) comprises a mounting hole (321) symmetrically arranged on both sides of the steel plate (31), the surface of the edge pile (2) is fixedly connected with a mounting strip (322), the mounting strip (322) is symmetrically arranged with the steel plate (31) as the center, and the side of the two mounting strips (322) away from each other is arranged in accordance with the curvature of the steel plate (31). The mounting hole (321) is provided with a fixing bolt (323) inside, and the fixing bolt (323) is in sliding connection with the inner side of the mounting hole (321), and the upper part of the steel plate (31) is fixedly connected with the two mounting strips (322) through the fixing bolt (323).

4. A scour protection structure for an offshore wind turbine pile foundation according to claim 3, characterized in that: Both ends of the horizontal rod (331) are provided with connecting flanges (332), and the side away from each other of the two connecting flanges (332) is fixedly connected with the surface of the center column (1) and the edge pile (2) respectively.

5. A scour protection structure for an offshore wind turbine pile foundation according to claim 4, characterized in that: Both ends of the horizontal rod (331) are provided with connecting bolts (333), and the connecting bolts (333) are uniformly distributed along the circumference of the horizontal rod (331) in several groups, and the two connecting flanges (332) are fixedly installed at both ends of the horizontal rod (331) through the connecting bolts (333).

6. A scour protection structure for an offshore wind turbine pile foundation according to claim 5, characterized in that: Both ends of the horizontal rod (331) are fixedly connected with limiting columns (334), and the ends away from each other of the two limiting columns (334) extend into the two connecting flanges (332) respectively, and the surface of the limiting column (334) is in sliding connection with the inner side of the connecting flange (332).

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