Anti-scouring device for offshore wind power foundation

Abstract

The invention discloses an offshore wind power foundation anti-scour device, and relates to the technical field of offshore wind power pile foundation protection, the offshore wind power foundation anti-scour device comprises a cover body, a plurality of filter holes are formed in the cover body, the cover body is at least divided into two water filter areas in the height direction of the cover body, and the water filter areas are continuously distributed in the height direction of the cover body; and the aperture of the filtering holes in the upper water filtering area is larger than that of the filtering holes in the lower water filtering area. The large-aperture filter holes in the upper portion of the cover body allow silt to enter rapidly, the small-aperture filter holes in the lower portion of the cover body effectively intercept the silt, the interception efficiency of the silt with different particle sizes is remarkably improved, active backfilling of a scouring pit is promoted, meanwhile, scouring of high-speed water flow to a seabed can be reduced, a silt sedimentation environment is created, and the foundation protection stability is enhanced. The small aperture at the bottom is matched with the gravity action to stop silt loss, sand can be continuously fed through the large aperture at the upper part even if local blockage occurs, and compared with a uniform aperture structure, the device is anti-blockage and can adapt to different silt particle sizes and water flow conditions, and the universality is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of protection for offshore wind power pile foundations, and particularly to an anti-erosion device for offshore wind power foundations. Background Art

[0002] Offshore wind power foundations are constantly eroded by the reciprocating action of waves, tides, and ocean currents for a long time, which easily leads to the loss of sediment in the surrounding seabed, forming erosion pits, threatening the foundation stability and even causing the collapse of the unit. The existing anti-erosion methods mainly include traditional dumping methods, pumping filling methods, sand accumulation methods, etc.

[0003] Traditional dumping methods, such as dumping sandbags, stones, and concrete components, belong to passive protection methods. They reduce erosion through physical barriers, but need to be regularly replenished and maintained, and the dumped materials are easily displaced by water flow, resulting in high long-term protection costs. The patent with publication number CN116163334B discloses an anti-erosion composite structure and construction method for offshore wind power structured cemented rockfill. Using a cementitious material to fill the gaps between adjacent mesh bags can reduce the gaps between adjacent mesh bags and prevent the seabed soil from being scoured through the gaps between adjacent mesh bags. It is fixed by cementation, with complex construction and difficult to recycle.

[0004] Existing pumping filling devices, such as the patent with publication number CN119434321B, which discloses an offshore wind power pile foundation erosion disaster control and protection device and construction method. During construction, it is necessary to pump sand and soil into the erosion pit between the erosion protection device and the offshore wind power pile foundation through the pumping holes provided on the erosion protection device until the sand and soil fill the entire erosion pit, forming a bottom soil filling layer. It is necessary to actively pump sand and soil into the erosion pit, relying on external intervention, and it is impossible to achieve natural sedimentation of sediment and long-term autonomous protection.

[0005] Existing sand accumulation devices with mesh cover structures, such as the patent with publication number CN116677020B, which discloses an offshore wind power pile foundation anti-erosion pit system. By blocking the flow to promote sediment settlement, it does not have some problems existing in the above traditional dumping methods and pumping filling methods. However, the anti-seepage microstructure (such as a reverse osmosis membrane) of the sand accumulation device depends on a fixed pore size, and can only intercept particles smaller than the pore size. Sediment larger than the pore size is completely blocked, resulting in low sand accumulation efficiency and easy blockage; the uniform pore size design is difficult to adapt to the changes in sediment particle size (such as the accumulation of large particle sediment in high sediment concentration sea areas) and water flow velocity in different sea areas, and the effect decays significantly under complex sea conditions.

[0006] In summary, the existing sand-gathering anti-scour device with a mesh cover structure has the advantages of active sand gathering and reducing the maintenance cost of repeated re-throwing of traditional stone-throwing protection. However, it has problems such as "low sand gathering efficiency" (fixed pores limit the particle interception range) and "poor adaptability to sea conditions" (uniform pore size cannot balance the needs of water flow and sand blocking). Especially in sea areas with diverse sediment particle sizes and complex water flow conditions, it is difficult to achieve long-term and effective protection of wind power foundations. Summary of the invention

[0007] In order to solve the problems of low sand gathering efficiency in the anti-scour device in the prior art, the present invention provides an anti-scour device for an offshore wind power foundation. By reasonably designing the filter hole structure and the overall structure of the cover body, the sediment interception efficiency is effectively improved, and the protection of the offshore wind power foundation is enhanced.

[0008] In order to achieve the above-mentioned purpose, the present invention provides an offshore wind power foundation anti-scour device, including a cover body. When the cover body is sleeved on the offshore wind power foundation, the cover body, the offshore wind power foundation and the seabed jointly enclose a storage space; a plurality of filter holes are provided on the cover body, and the cover body is divided into at least two water filtering areas along its height direction, and the water filtering areas are continuously distributed along the height direction of the cover body. The filter hole diameter of the upper water filtering area is larger than the filter hole diameter of the water filtering area located below it, which can play a role in accumulating mud and sand particles, promote the active backfilling of the scour pit around the offshore wind power foundation piles, and realize the long-term effective protection of the offshore wind power underwater foundation.

[0009] Particles entering the storage space from the filter holes in the upper filtration area will be intercepted if their particle size is smaller than the filter holes in the lower filtration area, thereby accumulating sediment particles and promoting the active backfilling of scour pits around offshore wind power foundation piles, avoiding the shortcomings of traditional riprap protection that requires repeated re-throwing, and achieving long-term and effective protection of offshore wind power underwater foundations.

[0010] In a preferred embodiment, the cover body is annular in structure, and includes two semi-annular parts that can form an annular structure of the cover body. The two semi-annular parts are detachably connected, so that the cover body can be easily installed on an offshore wind power foundation and easily disassembled.

[0011] In a preferred embodiment, a lower arc plate is fixed to the bottom of the semi-ring body, and the lower arc plate is connected to the seabed through a first fixing member, which can enhance the fixing effect between the bottom of the cover body and the seabed and improve the overall stability.

[0012] In a preferred embodiment, the first fixing member is an anchor nail or a small suction bucket.

[0013] In a preferred embodiment, both ends of the lower arc plate are provided with a bending plate, and the bending plates of the two lower arc plates are kept connected, so that the connection between the two semi-ring bodies can be tightened, thereby improving the stability of the cover body.

[0014] In a preferred embodiment, a hoop for connecting with an offshore wind power foundation is fixed at the top of the semi-cylindrical body portion, so as to realize the reliable connection between the cover body and the offshore wind power foundation. The two hoops are detachably connected through a bolt assembly, which is convenient for disassembly and assembly.

[0015] In a preferred embodiment, a plurality of stay rope mechanisms are further included in the storage space. The stay rope mechanism includes a second fixing member, an upper stay rope and a lower stay rope. The second fixing member is fixed to the seabed; the upper end of the upper stay rope is connected to the hoop, and the lower end is connected to the second fixing member; the upper end of the lower stay rope is connected to the semi-cylindrical body portion, and the lower end is connected to the second fixing member. The upper stay rope can play a role in fixing the hoop, and thus play a role in fixing the offshore wind power foundation, increasing the stability of the offshore wind power foundation. The lower stay rope can play a role in fixing the semi-cylindrical body portion, improving the installation stability of the semi-cylindrical body portion. The upper stay rope and the lower stay rope can play a role in intercepting and blocking the flow of sand, facilitating the gradual deposition of sediment in the storage space, and preventing the sediment from flowing out of the cover body due to too fast flow velocity.

[0016] In a preferred embodiment, a stay rope connecting piece is fixed on the second fixing member, and both the upper stay rope and the lower stay rope are connected to the second fixing member through the stay rope connecting piece. The second fixing member is an anchor bolt or a small suction bucket.

[0017] In a preferred embodiment, the lower part of the hoop is located in the storage space. An upper ear plate connected to the upper stay rope is fixed on the outer wall of the lower part of the hoop, and a lower ear plate connected to the lower stay rope is fixed on the semi-cylindrical body portion. The setting of the upper ear plate and the lower ear plate can facilitate the connection of the upper stay rope and the lower stay rope.

[0018] In a preferred embodiment, the upper stay rope is connected to the upper ear plate through a first turnbuckle, and the lower stay rope is connected to the lower ear plate through a second turnbuckle. The setting of the first turnbuckle can facilitate the tensioning of the upper stay rope, and the setting of the second turnbuckle can facilitate the tensioning of the lower stay rope.

[0019] In a preferred embodiment, a maintenance opening is provided on the semi-cylindrical body portion, and a maintenance door capable of opening and closing the maintenance opening is installed on the semi-cylindrical body portion. By opening the maintenance door, it is convenient to enter and exit the cover body.

[0020] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: 1. Hierarchical interception and efficient sand accumulation: The large-aperture filter holes in the upper part of the cover body allow sediment to enter quickly, and the small-aperture filter holes in the lower part effectively intercept, avoiding the blockage problem of the traditional fixed-pore reverse osmosis membrane, significantly improving the interception efficiency of sediment with different particle sizes, and promoting the active backfilling of the scour pit; 2. Optimization of water flow gradient for sedimentation: The large aperture in the upper part ensures the smooth entry of water flow, and the small aperture in the lower part reduces the flow velocity to form a slow-flow area, reducing the scour of the seabed by high-speed water flow, creating a favorable sedimentation environment for sediment, and enhancing the stability of foundation protection; 3. Strong adaptability to complex sea conditions: The large aperture can handle high sediment content and high-speed water flow, while the small aperture can intercept fine particles. Compared with the uniform aperture structure, it is anti-clogging and can adapt to different sediment particle sizes and water flow conditions, significantly improving its versatility. 4. Long-lasting, stable and low-maintenance: The small apertures at the bottom, combined with the action of gravity, prevent sediment from flowing away. Even if there is partial blockage, sand can still enter continuously through the upper large holes, achieving efficient filling of the scour pit and reducing the repeated replenishment cost of traditional riprap protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The three-dimensional view of the anti-scour device for offshore wind power foundation provided by an embodiment of the present invention Figure 1 ; Figure 2 The bottom view of the anti-scour device for offshore wind power foundation provided by an embodiment of the present invention; Figure 3 is Figure 2 the partial enlarged view at A in Figure 4 The front view of the anti-scour device for offshore wind power foundation provided by an embodiment of the present invention; Figure 5 is Figure 4 the sectional view along the line B-B in Figure 6 The second three-dimensional view of the anti-scour device for offshore wind power foundation provided by an embodiment of the present invention (omitting the filter holes); Figure 7 The usage state diagram of the anti-scour device for offshore wind power foundation provided by an embodiment of the present invention (omitting the filter holes); Figure 8 The structural schematic diagram of the guy wire mechanism provided by an embodiment of the present invention; In the figure, 1. Cover body; 11. Filter holes; 12. Filter water area; 13. Semi-circular body part; 131. Inspection opening; 132. Arc-shaped plate; 133. Connecting arc plate; 14. Lower arc plate; 141. Bent plate; 15. Hoop; 2. Offshore wind power foundation; 3. Seabed; 4. Storage space; 5. First fixing member; 6. Guy wire mechanism; 61. Second fixing member; 62. Upper guy wire; 63. Lower guy wire; 64. Guy wire connecting member; 65. Upper ear plate; 66. Lower ear plate; 67. First turnbuckle; 68. Second turnbuckle; 7. Inspection door. DETAILED DESCRIPTION OF THE INVENTION

[0022] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0023] Please refer to Figures 1 to 8 , an anti-scouring device for an offshore wind power foundation is provided in an embodiment of the present application, including a cover body 1. When the cover body 1 is sleeved on the offshore wind power foundation 2, a storage space 4 is jointly formed by the cover body 1, the offshore wind power foundation 2, and the seabed 3. The storage space 4 is used to store sediment.

[0024] The material of the cover body 1 is stainless steel, such as duplex stainless steel, with high strength and excellent corrosion resistance, suitable for the harsh environment of high flow velocity and sediment-laden scouring.

[0025] A number of filter holes 11 are provided on the cover body 1. The cover body 1 is divided into three filter water areas 12 along its height direction. The aperture of the filter holes 11 in the upper filter water area 12 is larger than the aperture of the filter holes 11 in the lower filter water area 12 below it. In other embodiments, the cover body 1 can also be divided into two, four, or more than four filter water areas 12 along its height direction. The height direction of the cover body 1 is the height direction when the cover body 1 is sleeved on the offshore wind power foundation 2.

[0026] An anti-fouling coating containing cuprous oxide, etc. is coated on the outer side of the cover body 1 to inhibit the attachment of marine organisms such as barnacles and algae and reduce the risk of blockage of the filter holes 11.

[0027] The cover body 1 is approximately frustum-shaped. When there is seawater impact, the seawater flows downward along the slope of the cover body 1, which can reduce the flow velocity. The sediment can flow down through the filter holes 11 and enter the storage space 4 jointly formed by the cover body 1 and the seabed 3, providing anti-scouring protection for the units without scouring pits. For the units with scouring pits, it can also be used to settle the sediment in the surrounding seawater and fill and repair the scouring pits.

[0028] The particles entering the storage space 4 through the filter holes 11 will settle downward under the action of gravity. If the particle size of the particles entering the storage space 4 through the filter holes 11 in the upper filter water area 12 is smaller than the aperture of the filter holes 11 in the lower filter water area 12, they will also be intercepted by the filter holes 11 in the lower filter water area 12, thus playing a role in accumulating sediment particles, promoting the active backfilling of the scouring pits around the pile of the offshore wind power foundation 2, avoiding the disadvantage of repeated replenishment of traditional riprap protection, and realizing long-term and effective protection of the underwater foundation of offshore wind power.

[0029] Since the pore diameters of the filter holes 11 in the three filter water areas 12 distributed from top to bottom of the cover body 1 decrease in sequence, only the particles with a particle size larger than the pore diameter of the filter holes 11 in the uppermost filter water area 12 will be blocked from entering the storage space 4. Therefore, the particle size distribution range of the particles that can enter the storage space 4 is relatively large, and the amount of particles that can enter the storage space 4 will also increase, which can improve the sand accumulation efficiency.

[0030] The filter holes 11 of the three filter water areas 12 distributed from top to bottom of the cover body 1 can be sequentially set to 5 - 10 mm, 2 - 5 mm, and 0.5 - 2 mm.

[0031] In this embodiment, the pore diameters of the filter holes 11 in the same filter water area 12 are set to be the same. Specifically, the three filter water areas 12 distributed from top to bottom of the cover body 1 can be sequentially set to 8 mm, 4 mm, and 1 mm.

[0032] In other embodiments, the pore diameters of the filter holes 11 from top to bottom in the same filter water area 12 can also be set to gradually decrease. That is, the filter holes 11 in the upper filter water area 12 gradually decrease in the range of 10 - 5 mm from top to bottom in the height direction, the filter holes 11 in the middle filter water area 12 gradually decrease in the range of 5 - 2 mm from top to bottom in the height direction, and the filter holes 11 in the lower filter water area 12 gradually decrease in the range of 2 - 0.5 mm from top to bottom in the height direction. Each filter water area 12 adopts a "gradually decreasing pore diameter from top to bottom" to further adapt to the attenuation law of the water flow velocity along the height direction. The pore diameters of the filter holes 11 at the junction of adjacent filter water areas 12 do not differ much, forming a transition section. For example, the pore diameter of the filter holes 11 at the top of the middle filter water area 12 is 5 mm, corresponding to the pore diameter of the filter holes 11 at the bottom of the upper filter water area 12, which can avoid local eddy currents caused by sudden changes in pore diameter.

[0033] It should be noted that if the pore diameters of the filter holes 11 in the same filter water area 12 are set to be the same, and the cover body 1 is divided into a relatively large number of filter water areas 12 along its height direction, such as dozens or hundreds of filter water areas 12, it can also have the beneficial effect of the "gradually decreasing pore diameter from top to bottom" of the filter holes 11 in the above - mentioned embodiment.

[0034] Compared with the existing device with a fixed mesh size, the cover body 1 of the present application has the following advantages: 1. It can enhance the sediment interception effect: The pore diameter of the filter holes 11 in the upper filter water area 12 is larger than that in the filter water area 12 below it, which can make full use of the characteristics of water flow and sediment at different positions. In the upper part of the cover body 1, the larger pore diameter allows the water flow carrying sediment to pass through quickly, ensuring a certain water passing capacity, and at the same time allowing the sediment to smoothly enter the inside of the cover body 1. As the water flow flows downward, the pore diameter decreases in sequence. The smaller pore diameter forms a more effective block for the sediment that has entered, reducing the possibility of sediment flowing out of the filter screen with the water flow, improving the sediment interception efficiency, and thus better protecting the seabed 3 around the offshore wind power pile foundation and preventing the formation of scouring pits due to sediment loss; 2. It can optimize the water flow regulation function: This design of aperture change can regulate the water flow more reasonably. When the water flow passes through the upper large-aperture water filtration area 12, the change in flow velocity is relatively small, ensuring the smooth entry of the water flow into the cover body 1. When the water flow enters the lower small-aperture water filtration area 12, due to the reduction of the water passing section, the water flow velocity will gradually decrease, forming an effect similar to a slow-flow area. This not only helps sediment settlement but also reduces the scouring of the bottom of the cover body 1 and the seabed 3 by high-speed water flow, stabilizes the water flow environment around the cover body 1, creates favorable conditions for sediment deposition, and further enhances the protection of the offshore wind power pile foundation; 3. It can better adapt to complex sea conditions: The sea conditions in different sea areas vary greatly, including water flow velocity, sediment content, and particle size. The gradient change design of the aperture of the cover body 1 in this application can better adapt to these changes. In sea areas with high sediment content and large particle size, the upper large aperture can quickly filter a large amount of sediment, avoiding the blockage of the filter holes 11 due to too fast sediment accumulation; in the water filtration area 12 with large changes in water flow velocity, the upper large aperture can cope with high-speed water flow, and the lower small aperture can effectively intercept sediment when the water flow velocity decreases. Compared with the filter holes 11 with uniform apertures, it has stronger adaptability and versatility; 4. It can efficiently accumulate sand: The lower small holes directly mechanically block the discharge of large particle sediment. Even if some local small filter holes 11 are blocked, the upper large holes can still continue to let in sand, and the sediment deposited at the bottom is difficult to flow back due to gravity and aperture limitations, and it is more efficient in filling the formed scouring pits.

[0035] In a preferred embodiment, the cover body 1 has an annular structure. The cover body 1 includes two semi-ring body parts 13 that can form the annular structure of the cover body 1. The two semi-ring body parts 13 are detachably connected, which is convenient for installing the cover body 1 on the offshore wind power foundation 2 and also for disassembly. A rubber sealing ring is embedded at the joint of the two semi-ring body parts 13 to prevent sand leakage at the joint.

[0036] For larger offshore wind power foundations, the size of the cover body 1 is correspondingly increased. To improve the connection stability of the two semi-ring body parts 13, a plurality of evenly distributed connecting ear plates can be fixed at the inner wall sides of the two semi-ring body parts 13. The connecting ear plates of the two semi-ring body parts 13 correspond to each other, and the corresponding two connecting ear plates are connected by bolt assemblies, so as to ensure the connection strength of the two semi-ring body parts 13 and achieve the technical effects of reliable fastening connection and sealing at the joint.

[0037] In this embodiment, the semi-ring body part 13 includes three arc-shaped plates 132. The water filtration area 12 is formed by the arc-shaped plates 132. Each arc-shaped plate 132 forms a water filtration area 12 alone. Adjacent two arc-shaped plates 132 are fixedly connected by connecting arc plates 133. The connecting arc plates 133 are fixedly connected to the inner wall of the arc-shaped plates 132. The arc-shaped plates 132 and the connecting arc plates 133 are jointly spliced into the semi-ring body part 13.

[0038] By arranging three arc-shaped plates 132 and punching holes in the three arc-shaped plates 132 respectively, it is convenient to process them into the semi-cylindrical body part 13. The arc-shaped plate 132 can be specifically fixedly connected to the adjacent two connecting arc plates 133 by welding. Specifically, after the three arc-shaped plates 132 are fixed together to form the semi-cylindrical body part 13 in advance, it can be placed in seawater and installed as the cover body 1; alternatively, the three arc-shaped plates 132 can be respectively placed in seawater and welded underwater to form the semi-cylindrical body part 13.

[0039] In other embodiments, the semi-cylindrical body part 13 can also be made by an integral molding method. However, due to the large size of the semi-cylindrical body part 13, the processing difficulty is relatively high. The appropriate structural form can be selected according to actual needs.

[0040] In a preferred embodiment, a lower arc plate 14 is fixed at the bottom of the semi-cylindrical body part 13. The lower arc plate 14 is connected to the seabed 3 through a first fixing member 5, so as to enhance the fixing effect between the bottom of the cover body 1 and the seabed 3 and improve the overall stability.

[0041] In this embodiment, the first fixing member 5 is set as an anchor bolt. An anchor hole for the first fixing member to pass through is formed on the lower arc plate 14. After the rod part of the anchor bolt passes through the anchor hole, it is fixed on the seabed 3, and the head of the anchor bolt presses on the lower arc plate 14. In other embodiments, the first fixing member 5 can also be set as a small suction bucket with an opening facing downwards, and it is made to pass through the silt covering layer of the seabed 3 and embed into the bearing layer of the seabed 3 through a suction device.

[0042] In a preferred embodiment, as Figure 1 and Figure 4 shown, it is arranged that both ends of the lower arc plate 14 are provided with bending plates 141. The bending plates 141 are formed by bending both ends of the lower arc plate 14. Installation holes are formed on the bending plates 141. The bending plates 141 of the two lower arc plates 14 are connected through bolt assemblies passing through the installation holes, so that the connection between the two semi-cylindrical body parts 13 can be made more firm, thereby improving the stability of the cover body 1.

[0043] In a preferred embodiment, as Figure 1 and Figure 4 shown, it is arranged that a hoop 15 for connecting with the offshore wind power foundation 2 is fixed at the top of the semi-cylindrical body part 13 to realize the reliable connection between the cover body 1 and the offshore wind power foundation 2. The two hoops 15 are detachably connected through bolt assemblies, which is convenient for disassembly and assembly.

[0044] In a preferred embodiment, as Figures 2 to 5 , and Figure 7As shown in the figure, a plurality of cable pulling mechanisms 6 are also provided in the storage space 4. The cable pulling mechanism 6 includes a second fixing member 61, an upper cable 62 and a lower cable 63. The second fixing member 61 is fixed to the seabed 3; the upper end of the upper cable 62 is connected to the hoop 15, and the lower end is connected to the second fixing member 61; the upper end of the lower cable 63 is connected to the semi-ring body 13, and the lower end is connected to the second fixing member 61. The second fixing member 61 is located between the upper end of the lower cable 63 and the upper end of the lower cable 63, which can improve the installation stability. After installation, the lower cable 63 and the lower cable 63 are in a tensioned state.

[0045] The number of the cable pulling mechanisms 6 is not less than 3 groups, and they are distributed in the circumferential direction of the offshore wind power foundation 2. The offshore wind power foundation 2 is a pipe pile structure. The specific number of the cable pulling mechanisms 6 is flexibly set according to requirements. In this embodiment, the number of the cable pulling mechanisms 6 is set to 12.

[0046] The upper cable 62 and the lower cable 63 are made of ultra-high molecular weight polyethylene fiber ropes.

[0047] The cable pulling mechanism 6 has three functions: First, by connecting the hoop 15 and the second fixing member 61, the upper cable 62 can play a role in fixing the hoop 15, and thus play a role in fixing the offshore wind power foundation 2, reducing the shaking of the offshore wind power foundation 2 and increasing the stability of the offshore wind power foundation 2; Second, the lower cable 63 connects the hoop 15 and the semi-ring body 13, which can play a role in fixing the semi-ring body 13, and jointly fix the semi-ring body 13 with the first fixing member 5 to improve the installation stability of the semi-ring body 13; Third, a certain number of the upper cable 62 and the lower cable 63 are provided, which can play a role in intercepting the flow and blocking the sand, so that the flow velocity of the sea current on the surface of the seabed 3 decreases, and the carried sediment is gradually deposited in the scouring pit inside the cover body 1, realizing the automatic siltation of the scouring pit and achieving the scouring effect of active protection. Moreover, this is more suitable for the complex hydrological conditions with uncertain underwater flow directions in some offshore waters of our country. After the scouring pit is filled, the carried sediment is gradually deposited in the storage space 4 inside the cover body 1 under the action of the flow blocking of the upper cable 62 and the lower cable 63, avoiding the outflow of the sediment from the cover body 1 due to too fast flow velocity.

[0048] In a preferred embodiment, a cable pulling connector 64 is fixed on the second fixing member 61. Both the upper cable 62 and the lower cable 63 are connected to the second fixing member 61 through the cable pulling connector 64. In this embodiment, it is set that the second fixing member 61 is selected as an anchor bolt, and the cable pulling connector 64 is fixedly installed on the rod part of the anchor bolt. It is also possible not to provide the cable pulling connector 64 and directly fix the upper cable 62 and the lower cable 63 on the rod part of the anchor bolt.

[0049] In other embodiments, a small suction bucket can also be selected. The small suction bucket adopts a small-diameter ring structure with the opening facing downward. The pulling rope connecting member 64 needs to be fixed at the top of the small suction bucket. The pulling rope connecting member 64 can adopt a lifting lug, which is convenient for connecting the upper pulling rope 62 and the lower pulling rope 63.

[0050] In a preferred embodiment, as Figure 3 and Figure 7 shown, the lower part of the hoop 15 is arranged in the storage space 4. An upper ear plate 65 connected to the upper pulling rope 62 is fixed on the outer wall of the lower part of the hoop 15. A lower ear plate 66 connected to the lower pulling rope 63 is fixed on the semi-ring body part 13. The lower ear plate 66 can be specifically fixed on the connecting arc plate 133. Setting the upper ear plate 65 and the lower ear plate 66 can facilitate the connection of the upper pulling rope 62 and the lower pulling rope 63.

[0051] Furthermore, to facilitate adjusting the pulling forces of the upper pulling rope 62 and the lower pulling rope 63 on the cover body 1, as Figure 8 shown, the upper pulling rope 62 is set to be connected to the upper ear plate 65 through a first turnbuckle 67, and the lower pulling rope 63 is set to be connected to the lower ear plate 66 through a second turnbuckle 68. One end of the first turnbuckle 67 is connected to the upper pulling rope 62, and the other end is connected to the upper ear plate 65. The tension of the upper pulling rope 62 can be adjusted through the first turnbuckle 67, thereby adjusting its pulling force on the cover body 1. One end of the second turnbuckle 68 is connected to the lower pulling rope 63, and the other end is connected to the lower ear plate 66. The tension of the lower pulling rope 63 can be adjusted through the second turnbuckle 68, thereby adjusting its pulling force on the cover body 1.

[0052] In a preferred embodiment, as Figure 6 shown, an inspection opening 131 is provided on the semi-ring body part 13. An inspection door 7 capable of opening and closing the inspection opening 131 is installed on the semi-ring body part 13 in a hinged manner. The inspection door 7 can be opened by rotating it, which is convenient for entering and exiting the cover body 1 through the inspection opening 131. A first connecting plate is fixed on the inspection door 7, and a second connecting plate is fixed on the semi-ring body part 13. Installation holes are provided on both the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate are connected by a bolt assembly passing through the installation holes to achieve reliable opening and closing of the inspection door 7. The hinge point of the inspection door 7 is located on the side away from the second connecting plate.

[0053] The inspection door 7 is provided with filter holes 11 having the same aperture as the filter holes 11 in the corresponding water filtration area 12.

[0054] After the cover body 1 is installed, the pull rope mechanism 6 is installed. To facilitate the installation of the pull rope mechanism 6, the maintenance door 7 can be opened, and a person can dive into the cover body 1 manually. The second fixing member 61 is fixed on the seabed 3, and then the upper pull rope 62 and the lower pull rope 63 are installed. After the installation is completed, leave the cover body 1 through the maintenance opening 131, and then fixedly connect the first connecting plate and the second connecting arc plate 133 through the bolt assembly, so that the maintenance door 7 closes the maintenance opening 131.

[0055] By opening the maintenance door 7, anti-erosion materials such as the gelling material and the net bag riprap body in the patent with the publication number CN116163334B can also be put into the storage space 4. The cover body 1 can limit the anti-erosion materials away from the offshore wind power foundation 2.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An offshore wind power foundation anti-scour device, comprising a cover body (1), characterized in that: When the cover body (1) is sleeved on the offshore wind power foundation (2), the cover body (1), the offshore wind power foundation (2) and the seabed (3) together enclose a material storage space (4); a plurality of filter holes (11) are provided on the cover body (1), and the cover body (1) is divided into at least two water filtering areas (12) along its height direction, and the filter holes (11) of the upper water filtering area (12) have a larger aperture than the filter holes (11) of the lower water filtering area (12).

2. The offshore wind power foundation anti-scour device according to claim 1, characterized in that: The cover body (1) is an annular structure, comprising two semi-annular body parts (13) capable of surrounding an annular structure of the cover body (1), and the two semi-annular body parts (13) are detachably connected.

3. The offshore wind power foundation anti-scour device according to claim 2 is characterized in that: A lower arc plate (14) is fixed to the bottom of the semi-annular body (13), and the lower arc plate (14) is connected to the seabed (3) via a first fixing member (5).

4. The offshore wind power foundation anti-scour device according to claim 3 is characterized in that: Both ends of the lower arc plate (14) are provided with a bending plate (141), and the bending plates (141) of the two lower arc plates (14) remain connected.

5. The offshore wind power foundation anti-scour device according to claim 2, characterized in that: A clamp (15) for connecting to an offshore wind power foundation (2) is fixed to the top of the semi-ring body (13).

6. The offshore wind power foundation anti-scour device according to claim 5, characterized in that: It also includes a plurality of pull rope mechanisms (6) located in the storage space (4), the pull rope mechanisms (6) including a second fixing member (61), an upper pull rope (62) and a lower pull rope (63), the second fixing member (61) being fixed to the seabed (3); the upper end of the upper pull rope (62) being connected to the clamp (15), and the lower end being connected to the second fixing member (61); the upper end of the lower pull rope (63) being connected to the semi-ring body (13), and the lower end being connected to the second fixing member (61).

7. The offshore wind power foundation anti-scour device according to claim 6, characterized in that: A pull rope connecting member (64) is fixed to the second fixing member (61), and the upper pull rope (62) and the lower pull rope (63) are both connected to the second fixing member (61) via the pull rope connecting member (64).

8. The offshore wind power foundation anti-scour device according to claim 6, characterized in that: The lower part of the clamp (15) is located in the material storage space (4), an upper ear plate (65) connected to the upper pull rope (62) is fixed on the lower outer wall of the clamp (15), and a lower ear plate (66) connected to the lower pull rope (63) is fixed on the semi-ring body (13).

9. The offshore wind power foundation anti-scour device according to claim 8, characterized in that: The pull rope (62) is connected to the upper ear plate (65) via a first turnbuckle bolt (67), and a lower pull rope (63) is connected to the lower ear plate (66) via a second turnbuckle bolt (68).

10. The offshore wind power foundation anti-scour device according to any one of claims 6 to 9, characterized in that: The semi-annular body (13) is provided with an inspection opening (131), and the semi-annular body (13) is provided with an inspection door (7) capable of opening and closing the inspection opening (131).

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