Simple current-convertible offshore wind power pile foundation scouring protection device

Abstract

The invention discloses a simple current-convertible offshore wind power pile foundation scouring protection device, which belongs to the technical field of offshore wind power equipment and comprises a pile foundation mounted on a seabed, a connecting sleeve is fixedly connected to the outer side of the bottom of the pile foundation, a protection sleeve is arranged outside the connecting sleeve, and a plurality of buffer mechanisms are arranged between the protection sleeve and the connecting sleeve at equal intervals. A plurality of flow guide plates are fixedly connected to the periphery of the protective sleeve at equal intervals, a sand collecting ring is fixedly connected to the bottom of the protective sleeve, and a plurality of small permeable holes are formed in the sand collecting ring. By simplifying the buffer structure, the overall complexity and manufacturing cost of the device are reduced; a plurality of small permeable holes are formed in the sand collecting ring, silt in flowing seawater is efficiently gathered and stably retained, secondary suspension and loss of the silt caused by water accumulation are avoided, and the risk that the seabed silt is emptied is reduced; and finally, on the basis of ensuring the pile foundation scouring protection effect, the economical efficiency, practicability and reliability of the device are considered, the low-cost protection requirements of small and medium-sized offshore wind power plants are met, and long-term stable operation of the offshore wind power pile foundation is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of offshore wind power equipment, and particularly relates to a simple and replaceable offshore wind power pile foundation scour protection device. BACKGROUND

[0002] Although the existing offshore wind power pile foundation scour protection device can achieve effective energy dissipation, most of the devices have complex buffer structures and a large number of parts, which not only have high processing costs, but also have great disassembly and assembly difficulties during underwater maintenance. Meanwhile, the guide plates of the traditional device are fixedly connected with the protection sleeve, if the guide plates are worn or damaged, the protection sleeve needs to be overhauled as a whole, which further increases the maintenance cost and is time-consuming and laborious. In addition, some devices lack targeted sediment collection structures, and fine sediments on the seabed surface are easily carried away by the undercurrent, which may cause the pile foundation bottom to be hollowed out over a long period of time, affecting the stability of the pile foundation. SUMMARY

[0003] The application aims to provide a simple and replaceable offshore wind power pile foundation scour protection device to solve the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the application provides the following scheme: the application provides a simple and replaceable offshore wind power pile foundation scour protection device, which comprises a pile foundation installed on a seabed, a connecting sleeve fixedly connected to the outer side of the bottom of the pile foundation, a protection sleeve arranged outside the connecting sleeve, a plurality of buffer mechanisms arranged at equal intervals between the protection sleeve and the connecting sleeve, a plurality of guide plates fixedly connected to the outer periphery of the protection sleeve at equal intervals, a sand collecting ring fixedly connected to the bottom of the protection sleeve, and a plurality of water permeable small holes arranged on the sand collecting ring.

[0005] Optionally, the buffer mechanism comprises a spring buffer rod fixedly connected between the connecting sleeve and the protection sleeve, the spring buffer rod comprises an outer sleeve tube fixedly connected to the inner wall of the protection sleeve, an inner rod slidably connected to the side of the outer sleeve tube away from the protection sleeve, and a buffer spring arranged between the outer sleeve tube and the inner rod.

[0006] Optionally, the two ends of the buffer spring are respectively in abutment with the protection sleeve and the connecting sleeve.

[0007] Optionally, the end of the outer sleeve tube and the side of the inner rod close to the connecting sleeve are respectively provided with a limiting ring.

[0008] Optionally, the side of the guide plate away from the protection sleeve is provided with an arc-shaped guide groove.

[0009] Optionally, the inner side wall of the arc-shaped guide groove is a smooth circular arc surface.

[0010] Optionally, the groove depth of the arc-shaped flow guide groove gradually increases from the top end of the flow guide plate to the bottom end of the flow guide plate.

[0011] Optionally, a plurality of threaded holes are arranged at the side of the flow guide plate close to the protective sleeve at equal intervals, and the flow guide plate is connected with the protective sleeve through the threaded holes and bolts.

[0012] Optionally, the sand collecting ring comprises a horizontal section and a vertical section, the vertical section is fixed to the bottom of the protective sleeve, and the water-permeable small holes are located in the horizontal section.

[0013] Optionally, the horizontal section is recessed downward from the upper surface to form a ring-shaped sand collecting cavity, the water-permeable small holes are uniformly distributed on the cavity bottom of the ring-shaped sand collecting cavity, and the hole diameter of the water-permeable small holes gradually increases from the inside to the outside of the ring-shaped sand collecting cavity.

[0014] The present application discloses the following technical effects: the present application simplifies the buffer structure, reduces the overall complexity and manufacturing cost of the device; by arranging a plurality of water-permeable small holes on the sand collecting ring, the flowing seawater is efficiently collected and retained, avoiding the secondary suspension and loss of the silt caused by the accumulated water, and reducing the risk of silt excavation of the seabed; ultimately, on the basis of ensuring the protection effect of the pile foundation scouring, the economy, practicality and reliability of the device are considered, the low-cost protection needs of the small and medium-sized offshore wind farms are adapted, and the long-term stable operation of the offshore wind power pile foundation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present application, the embodiments of the present application and the explanations thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a schematic diagram of the structure of the spring buffer rod of the present application;

[0018] Figure 3 It is a schematic diagram of the structure of the flow guide plate of the present application;

[0019] Figure 4 It is a top view of the sand collecting ring of the present application;

[0020] Figure 5 It is a schematic diagram of the structure of the sand collecting ring of the present application.

[0021] In the drawings: 1, pile foundation; 2, connecting sleeve; 3, protective sleeve; 4, spring buffer rod; 41, outer sleeve; 42, inner rod; 43, buffer spring; 44, limiting ring; 5, flow guide plate; 51, arc-shaped flow guide groove; 52, threaded hole; 6, sand collecting ring; 61, water-permeable small hole; 62, horizontal section; 63, vertical section. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Referring to Figures 1 to 5 The present embodiment provides a simple and replaceable offshore wind power pile foundation scour protection device, which comprises a pile foundation 1 installed on a seabed, a connecting sleeve 2 fixed to the outer side of the bottom of the pile foundation 1, a protective sleeve 3 arranged outside the connecting sleeve 2, a plurality of buffer mechanisms arranged at equal intervals between the protective sleeve 3 and the connecting sleeve 2, a plurality of guide plates 5 fixed to the outer periphery of the protective sleeve 3 at equal intervals, and a sand collecting ring 6 fixed to the bottom of the protective sleeve 3, wherein a plurality of water permeable small holes 61 are arranged on the sand collecting ring 6.

[0025] The present application simplifies the buffer structure, reduces the overall complexity and manufacturing cost of the device, sets a plurality of water permeable small holes 61 on the sand collecting ring 6, efficiently gathers and stably retains the sand in the flowing seawater, avoids the secondary suspension and loss of the sand caused by the accumulated water, reduces the risk of seabed sand hollowing, and ultimately ensures the scour protection effect of the pile foundation 1 while taking into account the economy, practicality and reliability of the device, which is suitable for the low-cost protection needs of small and medium-sized offshore wind farms and ensures the long-term stable operation of the offshore wind power pile foundation 1.

[0026] Further optimization scheme, the buffer mechanism includes a spring buffer rod 4 fixed between the connecting sleeve 2 and the protective sleeve 3, the spring buffer rod 4 includes an outer sleeve 41 fixed with the protective sleeve 3, one end of the outer sleeve 41 is fixed with the inner wall of the protective sleeve 3, the side of the outer sleeve 41 away from the protective sleeve 3 is slidingly connected with an inner rod 42, the end of the inner rod 42 away from the outer sleeve 41 is fixed with the connecting sleeve 2, and a buffer spring 43 is sleeved between the outer sleeve 41 and the inner rod 42.

[0027] The spring buffer rod 4 is provided at least in three groups between the connecting sleeve 2 and the protective sleeve 3, and the spring buffer rod 4 between the protective sleeve 3 and the connecting sleeve 2 replaces the complex buffer structure in the traditional device, directly absorbs the vibration caused by the water flow impact through the expansion and contraction of the buffer spring 43, and reduces the impact force transmitted to the pile foundation 1.

[0028] Further optimization scheme, the two ends of the buffer spring 43 are respectively abutted with the protective sleeve 3 and the connecting sleeve 2.

[0029] Further optimization scheme, the end of the outer sleeve 41 and the inner rod 42 are respectively provided with a limiting ring 44 near one side of the connecting sleeve 2. The limiting ring 44 is used to prevent the buffer spring 43 from exceeding the elastic limit and permanently deforming, achieving overload protection.

[0030] The spring buffer rod 4 is simple in structure and not prone to failure. Even if an individual buffer spring 43 is damaged, it can be replaced individually without the need to disassemble the protective sleeve 3 and the connecting sleeve 2, reducing maintenance difficulty. Through the stretching and retracting properties of the buffer spring 43, bidirectional energy dissipation is achieved, improving the buffering efficiency of the reciprocating impact of the sea water flow.

[0031] Further optimization scheme, the arc-shaped flow guide groove 51 is provided on the side of the flow guide plate 5 away from the protective sleeve 3.

[0032] Further optimization scheme, the inner side wall of the arc-shaped flow guide groove 51 is a smooth circular arc surface.

[0033] Further optimization scheme, the groove depth of the arc-shaped flow guide groove 51 gradually increases from the top end of the flow guide plate 5 to the bottom end of the flow guide plate 5.

[0034] The arc-shaped flow guide groove 51 on the surface of the flow guide plate 5 can guide the water flow to flow downward along the groove body, avoiding direct impact of the water flow on the side wall of the protective sleeve 3, and at the same time, guiding part of the water flow to the seabed surface, slowing down the scouring speed of the seabed sediment, and further improving the anti-loss effect in cooperation with the bottom sand collecting ring 6.

[0035] Further optimization scheme, a plurality of threaded holes 52 are provided on the side of the flow guide plate 5 close to the protective sleeve 3 at equal intervals, and the flow guide plate 5 is connected with the protective sleeve 3 through the threaded holes 52 and bolts.

[0036] The flow guide plate 5 is detachably connected with the protective sleeve 3 through bolts, and the end of the bolt is matched with a common spring washer to prevent the bolts from loosening due to water flow impact; when the flow guide plate 5 is abraded and deformed due to water flow scouring, the staff can directly underwater disassemble the old flow guide plate 5 and replace the new plate without the need for overall treatment of the protective sleeve 3, making regular maintenance and replacement more economical and simple, and at the same time reducing the impact on the marine wind power generation, indirectly improving the economic benefits of the wind power plant.

[0037] Further optimization scheme, the sand collecting ring 6 includes a horizontal section 62 and a vertical section 63, the vertical section 63 is fixedly connected with the bottom of the protective sleeve 3, and the water permeable small holes 61 are located on the horizontal section 62.

[0038] Further optimization scheme, the horizontal section 62 is recessed from the upper surface to form a ring-shaped sand collection cavity, and the water permeable small holes 61 are uniformly distributed on the cavity bottom of the ring-shaped sand collection cavity, and the pore size of the water permeable small holes 61 gradually increases from the inside to the outside of the ring-shaped sand collection cavity.

[0039] The sand collecting ring 6 is trumpet-shaped, and the horizontal section 62 is in close contact with the seabed. The sand collection cavity collects the sand in the converging seawater, and the water permeable small holes 61 with different pore sizes are used to realize rapid drainage, so as to avoid the loss of suspended sand caused by water accumulation, improve the sand retention efficiency, and enhance the stability of the bottom of the protective sleeve 3 through the deposited sand, thereby avoiding the inclination of the protective sleeve 3 due to uneven seabed.

[0040] The horizontal section 62 of the sand collecting ring 6 is recessed from the upper surface to form a sand collection cavity, and the recessed cavity can block the water flow from flowing rapidly along the seabed surface, so that the water flow naturally slows down in the cavity, thereby greatly reducing the ability of the water flow to carry sand, and the suspended sand in the water settles to the bottom of the sand collection cavity. The water permeable small holes 61 are uniformly distributed on the cavity bottom of the sand collection cavity, and the pore size of the water permeable small holes 61 gradually increases from the inside to the outside of the horizontal section 62. The water flow can be discharged by means of the water permeable small holes 61 with different pore sizes, so as to avoid the loss of suspended sand caused by water accumulation, and improve the sand retention efficiency.

[0041] The horizontal section 62 of the sand collecting ring 6 is in close contact with the seabed surface, and cooperates with the uniformly distributed water permeable small holes 61 to form a closed loop of "settling-draining-sand fixation". After the sand carried by the water flow settles in the horizontal section 62, the excess water is slowly drained through the water permeable small holes 61, which not only avoids the re-erosion of the settled sand by the accumulated water, but also allows the sand to gradually compact in the horizontal section 62 to form a "artificial sand pad" with uniform thickness, which not only fills the small gap between the bottom of the protective sleeve 3 and the seabed to prevent the seabed from being eroded by the undercurrent through the gap, but also enhances the friction between the sand collecting ring 6 and the seabed to further improve the stability of the pile foundation 1.

[0042] At the same time, the uniformly distributed water permeable small holes 61 can avoid the problem of sand hardening caused by local water accumulation. If the small holes are not uniformly distributed, local water accumulation areas will occur, and the sand in the water accumulation areas will form a hardening layer after long-term soaking, affecting the subsequent sand settlement. The uniformly arranged small holes can ensure uniform drainage, so that the sand in the horizontal section 62 is always in a benign cycle state of loosening-compaction, ensuring the long-term stable sand collecting effect of the sand collecting ring 6.

[0043] Working principle: When water impacts the protective sleeve 3, it first contacts the guide plate 5. The arc-shaped guide channel 51 guides the water flow downwards along the channel. The "deeper at the top and shallower at the bottom" design of the arc-shaped guide channel 51 constrains the water flow, guiding the originally chaotic water flow into a preset path and preventing the water flow from being dispersed and impacting. At the same time, the deeper upper channel section increases the contact area between the water flow and the channel wall, initially consuming some of the surface kinetic energy of the water flow through friction, laying the foundation for subsequent smooth flow guidance, and avoiding the generation of turbulence, thereby reducing the direct impact of the water flow on the protective sleeve 3. The vibration generated by the impact on the protective sleeve 3 is absorbed by the buffer spring 43 of the spring buffer rod 4. The inner rod 42 slides along the outer sleeve 41, further dispersing the impact force and preventing the vibration from being transmitted to the pile foundation 1. After the impact load weakens, the elastic reset characteristic of the buffer spring 43 will quickly release the elastic potential energy, driving the inner rod 42 to reset along the outer sleeve 41, thereby pushing the protective sleeve 3 back to its initial position to cope with the next water flow impact. Multiple spring buffer rods 4 are evenly distributed around the circumference of the protective sleeve 3, ensuring that the protective sleeve 3 receives balanced buffering support under the impact of multi-directional water flow (such as tidal reciprocating flow and oblique waves). This prevents the protective sleeve from tilting or even getting stuck with the connecting sleeve 2 due to uneven force on one side, further ensuring the structural stability of the entire protective device and the pile foundation, making the protective effect more durable and reliable. The sediment carried by the water flowing to the sand collection ring 6 through the arc-shaped guide channel is deposited on the horizontal section of the sand collection ring 6. Excess water is discharged through evenly distributed permeable holes 61. The deposited sediment forms a "sand mat", enhancing the bottom stability of the protective sleeve 3 and reducing the loss of seabed sediment.

[0044] When the guide plate 5 is severely worn, the staff can remove the bolts underwater to replace the guide plate; when the buffer spring 43 of the spring buffer rod 4 is damaged, the old spring can be cut off and the new spring replaced directly, without disassembling the protective sleeve 3 and the connecting sleeve 2.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A simple, scalable offshore wind turbine foundation scour protection device, comprising a foundation (1) installed on the seabed, characterized in that: The bottom outer side of the pile foundation (1) is fixed with a connecting sleeve (2), and a protective sleeve (3) is provided outside the connecting sleeve (2). Multiple buffer mechanisms are provided at equal intervals between the protective sleeve (3) and the connecting sleeve (2). Multiple guide plates (5) are fixed at equal intervals around the outer periphery of the protective sleeve (3). A sand collecting ring (6) is fixed at the bottom of the protective sleeve (3). Multiple permeable holes (61) are provided on the sand collecting ring (6).

2. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 1, characterized in that: The buffer mechanism includes a spring buffer rod (4) fixed between the connecting sleeve (2) and the protective sleeve (3). The spring buffer rod (4) includes an outer sleeve (41) fixed to the protective sleeve (3). One end of the outer sleeve (41) is fixed to the inner wall of the protective sleeve (3). An inner rod (42) is slidably connected to the side of the outer sleeve (41) away from the protective sleeve (3). The end of the inner rod (42) away from the outer sleeve (41) is fixed to the connecting sleeve (2). A buffer spring (43) is sleeved between the outer sleeve (41) and the inner rod (42).

3. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 2, characterized in that: The two ends of the buffer spring (43) abut against the protective sleeve (3) and the connecting sleeve (2), respectively.

4. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 2, characterized in that: The outer sleeve (41) end and the inner rod (42) near the connecting sleeve (2) are respectively provided with limiting rings (44).

5. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 1, characterized in that: The guide plate (5) has an arc-shaped guide groove (51) on the side away from the protective sleeve (3).

6. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 5, characterized in that: The inner wall of the arc-shaped guide groove (51) is a smooth arc surface.

7. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 5, characterized in that: The depth of the arc-shaped guide groove (51) gradually increases from the top of the guide plate (5) to the bottom of the guide plate (5).

8. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 1, characterized in that: The guide plate (5) has multiple threaded holes (52) at equal intervals on one side near the protective sleeve (3), and the guide plate (5) is connected to the protective sleeve (3) through the threaded holes (52) and bolts.

9. The simplified, commutative offshore wind turbine foundation scour protection device according to claim 1, characterized in that: The sand collection ring (6) includes a horizontal section (62) and a vertical section (63). The vertical section (63) is fixed to the bottom of the protective sleeve (3), and the water-permeable hole (61) is located in the horizontal section (62).

10. The simplified shunting-resistant offshore wind turbine foundation scour protection device according to claim 9, characterized in that: The horizontal section (62) is recessed from the upper surface to form an annular sand collection cavity. The permeable holes (61) are evenly distributed at the bottom of the annular sand collection cavity, and the diameter of the permeable holes (61) gradually increases from the inside to the outside of the annular sand collection cavity.

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