Offshore wind power single pile body scour protection device

Abstract

The application relates to the technical field of wind driven generators, in particular to a single-pile body scouring protection device for offshore wind power, which comprises, from bottom to top, coaxially connected support components, a primary protection component and a secondary protection component, wherein the secondary protection component comprises a secondary flow distribution cylinder which is formed in a cylindrical shape by a plurality of secondary flow distribution groups, the secondary flow distribution groups comprise secondary forward-side flow distribution strips and secondary reverse-side flow distribution strips which are symmetrically arranged and have the same shape, the cross sections of the secondary forward-side flow distribution strips and the secondary reverse-side flow distribution strips are all trapezoidal structures, and the width of one side of the secondary forward-side flow distribution strips and the secondary reverse-side flow distribution strips, which are connected with each other, is greater than the width of the other side. The application solves the problem that the single-pile body is subjected to seawater scouring for a long time in the prior art, thereby shortening the service life.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a scour protection device for a single offshore wind power pile. Background Art

[0002] Offshore wind power technology is one of the fastest-growing areas in green energy. The development of offshore wind farms has become an inevitable trend, especially given the limitations of onshore wind farm construction, such as large land area and noise pollution. Offshore wind turbines convert ocean wind into electricity, addressing the limitations of onshore wind farms while also leveraging the abundant offshore wind resources, providing a vital energy source for sustainable development in economically developed coastal regions. With technological advancements, offshore wind farms are maturing and becoming a crucial component of the global energy transition.

[0003] The name of the patent that has been made public is a Chinese patent with application number 202022810726.5, a reinforcement structure for a single pile for offshore wind power generation. Although this patented structure can achieve the reinforcement effect of the single pile foundation of the offshore wind turbine through the set tightening mechanism, this structure only protects the single pile body of the offshore wind turbine. The single pile body is still subjected to the erosion of seawater for a long time. In this case, the single pile body may be corroded, broken, bent or sunken, thereby accelerating the shortening of the life of the single pile body. Summary of the Invention

[0004] The purpose of this application is to provide a scour protection device for offshore wind power monopile, which solves the problem in the prior art that the monopile body is subjected to long-term seawater scour, resulting in a very short service life. The technical solution of this application is:

[0005] The present application provides an offshore wind power single pile body scour protection device, comprising: a support assembly, a primary protection assembly, and a secondary protection assembly coaxially connected in sequence from bottom to top, wherein the secondary protection assembly comprises a secondary diverter tube, the secondary diverter tube is enclosed by a plurality of secondary diverter groups to form a cylindrical shape, the secondary diverter group comprises a secondary lateral diverter strip and a secondary reverse diverter strip of the same shape and symmetrically arranged, the cross-sections of the secondary lateral diverter strip and the secondary reverse diverter strip are both trapezoidal structures, and the width of the side where the secondary lateral diverter strip is connected to the secondary reverse diverter strip is greater than the width of the other side.

[0006] In some embodiments, the trapezoidal structure specifically includes a contact segment, a connecting segment, a splicing segment, and a diversion segment connected end to end, the connecting segment and the splicing segment are both straight lines and the length of the connecting segment is greater than the length of the splicing segment; the contact segment is an arc and multiple contact segments are enclosed to form a complete circle; the diversion segment is a wavy line, the part close to the splicing segment bulges toward the side away from the contact segment, and the part close to the connecting segment is recessed toward the side close to the contact segment.

[0007] In some embodiments, the connecting section of the secondary cis-side diverter strip is connected to the connecting section of the secondary converse-side diverter strip.

[0008] In some embodiments, the first-level protection component includes a first-level diverter pipe, and the first-level diverter pipe includes a first-level inner pipe, a limiting ring and a first-level diverter plate. A plurality of the limiting rings are evenly spaced outside the first-level inner pipe, and the axis of the first-level diverter plate intersects with the axis of the first-level inner pipe. A plurality of the first-level diverter plates are evenly spaced and connected to the outer circle of the first-level inner pipe. The first-level diverter plate is embedded in the limiting ring on the side close to the first-level inner pipe.

[0009] In some embodiments, the length of the primary diverter plate is smaller than the length of the primary inner tube.

[0010] In some embodiments, the lower end of the secondary diverter tube is connected to the limiting ring connected to the top end of the primary inner tube, and the lower end of the secondary diverter tube is located inside the interior surrounded by multiple primary diverter plates.

[0011] In some embodiments, the support assembly includes a support tube, a stabilizing tube and a stabilizing rod. The bottom of the first-level inner tube is passed through the support tube, and multiple stabilizing tubes are evenly spaced outside the support tube. The upper ends of the stabilizing tubes and the lower ends of the stabilizing tubes are connected by the stabilizing rod.

[0012] In some embodiments, the support assembly further includes a reinforcing rod, which passes through the stabilizing tube and is inserted into the seabed.

[0013] In some embodiments, the secondary protection component also includes a secondary elastic sleeve and a secondary limiting cylinder, and the secondary diverter cylinder, the secondary elastic sleeve, and the secondary limiting cylinder are sequentially arranged from the outside to the inside; the first-level protection component also includes a first-level elastic sleeve and a first-level limiting cylinder, and the first-level diverter cylinder, the first-level elastic sleeve, and the first-level inner tube are sequentially arranged from the outside to the inside; the support component also includes a third-level elastic sleeve; the first-level elastic sleeve, the second-level elastic sleeve, and the third-level elastic sleeve are all made of elastic material and the outer surface is coated with an anti-corrosion coating and an isolation layer.

[0014] In some embodiments, the secondary limiting cylinder has the same diameter as the primary limiting cylinder and is connected, the secondary elastic sleeve, the primary elastic sleeve, and the tertiary elastic sleeve are connected to form an installation space, a single pile foundation is connected in the installation space, and the bottom of the single pile foundation passes through the tertiary elastic sleeve and is inserted into the seabed.

[0015] The technical solution of this application has at least the following advantages and beneficial effects:

[0016] The present application provides an offshore wind power single pile body scour protection device, which realizes the limitation of the position of the single pile foundation and the support and stability of the bottom through the support component, and realizes the anti-scour protection of the part of the single pile foundation located inside the sea water through the set first-level protection component. By setting a secondary forward diversion strip and a secondary reverse diversion strip and designing the cross section of the strip into a trapezoidal structure, the impact force of the seawater on the single pile in the splash zone acts on the surface of the secondary diversion tube, and the surface of the secondary diversion tube divides the seawater into multiple groups, each group of diversions has two forces, which are in opposite directions and offset each other with the force of the seawater that continues to flow toward the secondary diversion tube to achieve force offset, thereby achieving the reduction of the force of the seawater acting on the surface of the secondary diversion tube, solving the problem in the prior art that the single pile body is subjected to seawater scouring for a long time and has a very short service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of this application;

[0018] Figure 2 A schematic diagram of a trapezoidal structure in this application;

[0019] Figure 3 This is a front view of the structure of this application;

[0020] Figure 4 for Figure 3 Middle AA section view;

[0021] Figure 5 for Figure 3 Middle BB section view;

[0022] Figure 6 for Figure 3 Center CC section view.

[0023] In the figure: 100 - secondary protection assembly; 101 - secondary shunt cylinder; 102 - secondary forward shunt strip; 103 - secondary reverse shunt strip; 104 - contact section; 105 - connecting section; 106 - splicing section; 107 - shunt section; 108 - secondary elastic sleeve; 109 - secondary limiting cylinder; 200 - primary protection assembly; 201 - primary shunt pipe; 202 - primary inner pipe; 203 - limiting ring; 204 - primary shunt plate; 205 - primary elastic sleeve; 206 - primary limiting cylinder; 300 - support assembly; 301 - support pipe; 302 - stabilizing pipe; 303 - stabilizing rod; 304 - reinforcing rod; 305 - tertiary elastic sleeve; 400 - single pile foundation. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely 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 those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Embodiment 1

[0026] Please refer to Figures 1-6 The present application provides a scour protection device for offshore wind power single pile, which comprises, from bottom to top, a support assembly 300, a primary protection assembly 200 and a secondary protection assembly 100 connected coaxially, wherein the secondary protection assembly 100 comprises a secondary shunt cylinder 101, which is formed into a cylindrical shape by a plurality of secondary shunt groups, the secondary shunt groups comprise secondary forward shunt strips 102 and secondary reverse shunt strips 103 which are symmetrical and have the same shape, the cross sections of the secondary forward shunt strips 102 and the secondary reverse shunt strips 103 are all trapezoidal structures, and the width of the side where the secondary forward shunt strips 102 and the secondary reverse shunt strips 103 are connected is greater than the width of the other side.

[0027] It is worth mentioning that the embodiment sets the support assembly 300, the primary protection assembly 200, and the secondary protection assembly 100, realizes the limitation of the position of the single pile foundation 400 and the support and stability of the bottom through the support assembly 300, realizes the anti-scouring protection of the part of the single pile foundation 400 located inside the seawater through the set primary protection assembly 200, and realizes the anti-scouring protection of the part of the single pile foundation 400 located at the position where the seawater and the air above meet through the secondary protection assembly 100. In detail, the offshore wind turbine single pile foundation 400 is located in the splash zone above the mean high tide line. Because the structure surface is subjected to the continuous impact of the splashing seawater for a long time, the surface is always periodically wetted by seawater, the oxygen supply is sufficient, and the salt is continuously concentrated. The existing technology lacks a completely reliable protection method, and it is the most serious part of corrosion. The embodiment sets the secondary forward flow splitter 102 and the secondary reverse flow splitter 103 which are the same shape and symmetrically arranged, Figure 2 and Figure 3 The dashed line in the figure schematically shows the flow direction of seawater. The cross section of the secondary forward flow splitter 102 and the secondary reverse flow splitter 103 is designed as a trapezoidal structure, and the width of the side where the secondary forward flow splitter 102 and the secondary reverse flow splitter 103 are connected is greater than the width of the other side. The impact force of seawater on the single pile in the splash zone acts on the surface of the secondary flow cylinder 101, and the surface of the secondary flow cylinder 101 divides the seawater into multiple groups. Each group of flow has two forces, and the directions of the two forces are opposite and counteract the force of seawater continuously flowing to the secondary flow cylinder 101, thereby reducing the force of seawater acting on the surface of the secondary flow cylinder 101, and solving the problem that the single pile body is subjected to seawater scouring for a long time in the prior art, resulting in a very short service life.

[0028] In some embodiments, the trapezoidal structure specifically includes a contact section 104, a connection section 105, a splicing section 106, and a flow splitting section 107. The connection section 105 and the splicing section 106 are straight lines, and the length of the connection section 105 is greater than the length of the splicing section 106. The contact section 104 is an arc, and multiple contact sections 104 form a complete circle. The flow splitting section 107 is a wavy line, and the part close to the splicing section 106 protrudes to the side away from the contact section 104, and the part close to the connection section 105 is recessed to the side close to the contact section 104.

[0029] It is worth mentioning that, as Figure 2As shown, if the contact section 104 is an arc, a closed loop can be formed by sequentially connecting multiple secondary lateral diversion strips 102 and secondary lateral diversion strips 103, and then used to connect to the outer surface of the single pile foundation 400. The length of the connecting section 105 is greater than the length of the splicing section 106, which can better form the wavy diversion section 107. On the other hand, the two diversion sections 107 extending in opposite directions can better achieve the diversion effect. Compared with a simple arc segment, the wavy curved surface with one side convex and the other side concave can better decompose and offset the force of seawater, extend the life of the secondary diversion tube 101, and also extend the life of the single pile foundation 400.

[0030] In some embodiments, the connecting section 105 of the secondary lateral diverter strip 102 is connected to the connecting section 105 of the secondary lateral diverter strip 103, so that the direction of the force dispersion of the secondary lateral diverter strip 102 on the seawater is opposite to the direction of the force dispersion of the secondary lateral diverter strip 103 on the seawater. Due to the complexity of the marine environmental conditions and the damage or aging that may occur during long-term use, the monopile foundation 400 needs to be regularly inspected and maintained, or disassembled and replaced. The arrangement of this embodiment can form multiple groups of mutually offsetting forces around the entire secondary diverter tube 101, reducing the impact of seawater on the secondary diverter tube 101, further reducing the scouring effect of seawater on the monopile foundation 400, extending the service life of the monopile foundation 400, shortening the maintenance frequency, and reducing the probability of replacing the monopile foundation 400. Preferably, the length of the secondary diverter tube 101 is 1-100m, which can be selected according to needs.

[0031] Example 2

[0032] Please refer to Figures 1-6 On the basis of Example 1, the first-level protection component 200 includes a first-level diverter pipe 201, the first-level diverter pipe 201 includes a first-level inner pipe 202, a limiting ring 203 and a first-level diverter plate 204, multiple limiting rings 203 are evenly spaced outside the first-level inner pipe 202, the axis of the first-level diverter plate 204 intersects with the axis of the first-level inner pipe 202, multiple first-level diverter plates 204 are evenly spaced and connected to the outer circle of the first-level inner pipe 202, and the side of the first-level diverter plate 204 close to the first-level inner pipe 202 is embedded in the limiting ring 203.

[0033] It should be noted that the portion of the single pile body that is completely immersed in seawater is less exposed to air or oxygen than the splash zone, and the scouring force of seawater is smaller. Therefore, a one-way diversion first-level diverter plate 204 is set in a targeted manner and its axis intersects with the axis of the first-level inner tube 202, that is, the first-level diverter plate 204 is tilted and set on the outer circle of the first-level inner tube 202. When the seawater scours, the force of the seawater is dispersed, with part returning from the opposite direction, part diverting along the upper and lower ends of its extension direction, and a small part diverting to both sides, so that it is opposite to the force of the surrounding seawater and thus cancels each other out. The position of the first-level diverter plate 204 is fixed by the set limit ring 203 to avoid it from being severely deformed during the process of being scour by seawater. The middle part of the single pile foundation 400 is fixed by the set first-level inner tube 202.

[0034] In some embodiments, the lower end of the secondary manifold 101 is connected to the retaining ring 203 connected to the top end of the primary inner tube 202, and the secondary manifold 101 is coaxially connected to the top end of the primary inner tube 202. To avoid interference between the secondary manifold 101 and the primary manifold plates 204, the lower end of the secondary manifold 101 is located inside the enclosure surrounded by multiple primary manifold plates 204.

[0035] Example 3

[0036] Please refer to Figures 1-6 Based on Example 2, the support assembly 300 includes a support tube 301, a stabilizing tube 302, and a stabilizing rod 303. The bottom of the primary inner tube 202 is inserted into the support tube 301, and multiple stabilizing tubes 302 are evenly spaced outside the support tube 301. The upper ends of the stabilizing tubes 302 and the upper ends of the support tube 301, as well as the lower ends of the stabilizing tubes 302 and the lower ends of the support tube 301, are connected by stabilizing rods 303. The support tube 301 is connected to the bottom of the monopile foundation 400. The stabilizing tubes 302 and stabilizing rods 303 secure the support tube 301 on all sides, ensuring that both the upper and lower ends of the support tube 301 have forces acting to restrict its position. A sealing ring is connected to the top of the support tube 301, and the bottom of the primary diverter plate 204 abuts the sealing ring.

[0037] In some embodiments, support assembly 300 further includes a reinforcing rod 304, which passes through stabilizing tube 302 and is then inserted into the seabed. The length of primary diverter plate 204 is shorter than that of primary inner tube 202. By providing reinforcing rod 304 and inserting its bottom into the seabed, the position of stabilizing tube 302 is defined, while simultaneously applying force to stabilizing rod 303, ensuring that the force exerted by stabilizing rod 303 on support tube 301 is maintained.

[0038] Preferably, a stopper is provided at a designated position of the reinforcing rod 304 , and the stopper is located above the exterior of the stabilizing tube 302 .

[0039] In some embodiments, the secondary protection assembly 100 further includes a secondary elastic sleeve 108 and a secondary limiting cylinder 109, with the secondary diverter cylinder 101, the secondary elastic sleeve 108, and the secondary limiting cylinder 109 being sequentially mounted from the outside to the inside. The primary protection assembly 200 further includes a primary elastic sleeve 205 and a primary limiting cylinder 206, with the primary diverter cylinder, the primary elastic sleeve 205, and the primary inner tube 202 being sequentially mounted from the outside to the inside. The support assembly 300 further includes a tertiary elastic sleeve 305. The primary elastic sleeve 205, the secondary elastic sleeve 108, and the tertiary elastic sleeve 305 all directly contact the outer surface of the monopile foundation 400 to protect the outer surface of the monopile. Since the temperature of seawater changes throughout the year, in order to prevent the first-level elastic sleeve 205, the second-level elastic sleeve 108, and the third-level elastic sleeve 305 from squeezing or damaging the outer surface of the single pile foundation 400, the first-level elastic sleeve 205, the second-level elastic sleeve 108, and the third-level elastic sleeve 305 are all made of elastic materials, which can provide sufficient space for the changes of other components when they expand and contract due to temperature changes, thereby ensuring that the single pile foundation 400 can be protected at different temperatures. On the other hand, the elastic material can also generate a reaction force when the device is subjected to impact, thereby reducing the damage to the single pile foundation 400 caused by the huge external force.

[0040] Preferably, the outer surfaces of the primary elastic sleeve 205, the secondary elastic sleeve 108, and the tertiary elastic sleeve 305 are coated with an anti-corrosion coating and an isolation layer to mitigate corrosion of the elastic material. The coating can be made of stainless steel, titanium alloy, nickel-based alloy, polymer material, fiberglass reinforced plastic, carbon fiber composite material, or other seawater-resistant coating. Preferably, the coatings of different materials are applied sequentially.

[0041] In some embodiments, the secondary limiting cylinder 109 has the same diameter as the primary limiting cylinder 206 and is connected, the secondary elastic sleeve 108, the primary elastic, and the tertiary elastic sleeve 305 are connected to form an installation space, the installation space is connected to the single pile foundation 400, and the bottom of the single pile foundation 400 passes through the tertiary elastic sleeve 305 and is inserted into the seabed.

[0042] It is worth noting that, during installation of this embodiment, the primary protection assembly 200 is connected to the support assembly 300, the secondary protection assembly 100 is connected to the primary protection assembly 200, the pile gripper support seat is connected to the pile boat, and then the support assembly 300 is temporarily installed with the pile gripper support seat, and then the pile gripper is passed through the top of the secondary protection assembly 100 and connected to the pile gripper support seat, and then a temporary support pile is inserted, and the pile gripper, the secondary protection assembly 100, the primary protection assembly 200, and the support assembly 300 are temporarily set at the position to be installed of the single pile foundation 400 through the temporary support pile, and then the single pile foundation 400 is inserted into the seabed after passing through the pile gripper, the secondary protection assembly 100, the primary protection assembly 200, and the support assembly 300 in sequence, and then the single pile foundation 400 is hammered so that the length inserted into the seabed is the specified size. Specifically, to ensure the depth of the entire protective device's connection with the seabed, the reinforcing rod 304 is inserted into the stabilizing tube 302 when the primary protection assembly 200 is connected to the support assembly 300. After hammering the monopile foundation 400, the reinforcing rod 304 is hammered. Due to the stoppers on the reinforcing rod 304, the reinforcing rod 304 exerts a force on the entire device, pushing the entire device downward into the seabed as the reinforcing rod 304 penetrates deeper into the seabed. It should be noted that the monopile foundation 400 adheres to the inner wall of the elastic sleeve during its insertion into the protective device, and the entire protective device's downward pressure on the seabed squeezes out seawater from the bottom space.

[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A scour protection device for a single offshore wind power pile, characterized in that: include: The supporting assembly (300), the primary protection assembly (200), and the secondary protection assembly (100) are coaxially connected in sequence from bottom to top, wherein the primary protection assembly (200) is used for anti-scouring protection of the portion of the monopile foundation (400) located inside the seawater, and the secondary protection assembly (100) is used for anti-scouring protection of the portion of the monopile foundation (400) located at the interface between the seawater and the air above; the secondary protection assembly (100) comprises a secondary diversion tube (101), the secondary diversion tube (101) is formed into a cylindrical shape by being enclosed by a plurality of secondary diversion groups, the secondary diversion groups comprise secondary lateral diversion strips (102) and secondary lateral diversion strips (103) of the same shape and symmetrically arranged, the cross sections of the secondary lateral diversion strips (102) and the secondary lateral diversion strips (103) are both trapezoidal structures, and the secondary lateral diversion strips (102) and the secondary lateral diversion strips (103) are symmetrically arranged. The width of one side of the flow strip (103) is greater than the width of the other side; the trapezoidal structure specifically includes a contact section (104), a connecting section (105), a splicing section (106), and a diversion section (107) connected end to end, the connecting section (105) and the splicing section (106) are both straight lines, and the length of the connecting section (105) is greater than the length of the splicing section (106); the contact section (104) is an arc, and a plurality of the contact sections (104) are enclosed to form a complete circle; the diversion section (107) is a wavy line, the part close to the splicing section (106) is convex toward the side away from the contact section (104), and the part close to the connecting section (105) is concave toward the side close to the contact section (104); the connecting section (105) of the secondary forward-side diversion strip (102) is connected to the connecting section (105) of the secondary reverse-side diversion strip (103).

2. The protective device according to claim 1, characterized in that The first-level protection component (200) comprises a first-level diverter pipe (201), the first-level diverter pipe (201) comprises a first-level inner pipe (202), a limiting ring (203) and a first-level diverter plate (204), a plurality of the limiting rings (203) are evenly spaced and sleeved outside the first-level inner pipe (202), the axis of the first-level diverter plate (204) intersects with the axis of the first-level inner pipe (202), the plurality of the first-level diverter plates (204) are evenly spaced and connected to the outer circle of the first-level inner pipe (202), and the first-level diverter plate (204) is embedded in the limiting ring (203) on a side close to the first-level inner pipe (202).

3. The protective device according to claim 2, characterized in that: The length of the first-level diverter plate (204) is smaller than the length of the first-level inner tube (202).

4. The protective device according to claim 2, characterized in that: The lower end of the secondary diversion tube (101) is connected to the limiting ring (203) connected to the top end of the primary inner tube (202), and the lower end of the secondary diversion tube (101) is located inside the area surrounded by the plurality of primary diversion plates (204).

5. The protective device according to claim 3, characterized in that: The support assembly (300) comprises a support tube (301), a stabilizing tube (302) and a stabilizing rod (303); the bottom of the first-level inner tube (202) is inserted into the support tube (301); a plurality of stabilizing tubes (302) are evenly spaced and arranged outside the support tube (301); the upper end of the stabilizing tube (302) is connected to the upper end of the support tube (301), and the lower end of the stabilizing tube (302) is connected to the lower end of the support tube (301) via the stabilizing rod (303).

6. The protective device according to claim 5, characterized in that: The support assembly (300) further includes a reinforcing rod (304), which is inserted into the seabed after passing through the stabilizing tube (302).

7. The protective device according to claim 6, characterized in that The secondary protection assembly (100) further comprises a secondary elastic sleeve (108) and a secondary limiting cylinder (109), wherein the secondary diversion cylinder (101), the secondary elastic sleeve (108), and the secondary limiting cylinder (109) are sequentially sleeved from the outside to the inside; The first-level protection assembly (200) further includes a first-level elastic sleeve (205) and a first-level limiting cylinder (206), wherein the first-level diversion cylinder, the first-level elastic sleeve (205), and the first-level inner tube (202) are sequentially sleeved from the outside to the inside; The support assembly (300) further includes a three-stage elastic sleeve (305); The first-level elastic sleeve (205), the second-level elastic sleeve (108), and the third-level elastic sleeve (305) are all made of elastic material and have their outer surfaces coated with an anti-corrosion coating and an isolation layer.

8. The protective device according to claim 7, characterized in that: The secondary limiting cylinder (109) has the same diameter as the primary limiting cylinder (206) and is connected. The secondary elastic sleeve (108), the primary elastic sleeve, and the tertiary elastic sleeve (305) are connected to form an installation space. A single pile foundation (400) is connected in the installation space. The bottom of the single pile foundation (400) passes through the tertiary elastic sleeve (305) and is inserted into the seabed.

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