A turbulence system for slowing down the scouring erosion of the seabed around the pile foundation of an offshore wind turbine and a construction method thereof

Abstract

The present application relates to a kind of turbulence system and construction method for slowing down scouring erosion of seabed around offshore wind turbine pile foundation, to destroy original downflow and horseshoe vortex system, set wide range of spoiler at a distance from wind turbine pile foundation body, especially in the direction of reciprocating flow dominant direction;More intensive and higher spoiler is arranged within one times pile diameter range around pile foundation body, and the bed surface around pile foundation body is mainly protected.The present application designs spoiler and achieves the purpose of large-scale anti-scouring by the arrangement mode of multiple initiatives combination and multiple devices joint action, and is strong in universality, can be used in different terrain and different environment, especially effective for reciprocating flow.

Description

TECHNICAL FIELD

[0001] The application relates to a flow disturbing system for slowing down the scouring erosion of a seabed around a pile foundation of an offshore wind turbine and a construction method, and belongs to the technical field of marine engineering structures. BACKGROUND

[0002] Offshore wind energy is a clean, huge, renewable and predictable energy source, and its reasonable development and utilization have great significance for alleviating energy crisis and improving environmental pollution problems. Offshore wind turbines are widely used, but they also face the problem of pile foundation safety risk caused by long-term water flow erosion of the seabed.

[0003] After studying the water flow erosion, it is found that the pile foundation as a marine structure has a flow around it similar to a circular cylinder. The existence of the cylinder causes an adverse pressure gradient, which has a strong influence on the distribution of upstream flow velocity and boundary layer separation. The vortex structure formed by the boundary layer separation in front of the flow object is in the shape of a horseshoe, so it is called a horseshoe vortex. Obviously, how to weaken the water flow energy of the horseshoe vortex is an important means to effectively protect the pile foundation. The utility model with the application number

[0004] 202221854375.0 discloses an offshore wind turbine structure capable of coping with high-intensity scouring in bad weather, which comprises a mounting pipe and a pile foundation. The mounting pipe is provided with a top plate and a bottom plate on one side. The top plate is connected with the outer wall of the mounting pipe, and a plurality of connecting ribs are connected between the top plate and the bottom plate. A plurality of stepped plates are connected between the connecting ribs, the top plate, the stepped plates and the bottom plate are all provided with through holes, and a buffer assembly for buffering the impact force of seawater is arranged on the base. The first elastic plate and the second elastic plate are used to buffer the impact force on the buffer plate in the first step, and then the stepped structure of the top plate, the stepped plate and the floor is used to reduce the flow velocity of the bottom ocean current, avoid the scouring of the bottom flow velocity on the pile foundation, and destroy the horseshoe vortex flow formed by the ocean current around the pile foundation, so as to finally protect the pile foundation.

[0005] However, in actual working conditions, the composition of the horseshoe vortex is very complex, and the impact of the dominant water flow direction (reciprocal flow direction) needs to be considered. Therefore, the existing technology still needs to be improved in terms of preventing water flow from eroding the seabed around the pile foundation. SUMMARY

[0006] The application provides a flow disturbing system for slowing down the scouring erosion of a seabed around a pile foundation of an offshore wind turbine and a construction method, which designs a flow disturbing plate and realizes the purpose of large-scale scouring prevention by means of multiple measures and multiple devices.

[0007] The technical solution adopted by the application to solve the technical problems is as follows:

[0008] A turbulence system for slowing down the scouring erosion of seabed around the pile foundation of offshore wind turbine, comprising a pile foundation body, taking the center of the bottom surface of the pile foundation body as the origin, the cross section is XOY plane composed of X axis and Y axis, the central axis direction of the pile foundation body is Z axis, a three-dimensional coordinate system is constructed, wherein the dominant water flow direction is defined as the positive direction of X axis;

[0009] The diameter of the pile foundation body is defined as D, a plurality of concentric circles are distributed outwardly around the central axis of the pile foundation body, which are respectively defined as circle 1, circle 2, …, and circle n, wherein circle n is the farthest concentric circle from the pile foundation body, and the distance between circle n and the pile foundation body is ≦2D;

[0010] A plurality of turbulence plates are arranged along the circumference of each concentric circle, and on the X axis, a turbulence plate is symmetrically arranged at a position 4D away from the pile foundation body. Four tangent lines are drawn from circle n, one end of each tangent line is located at circle n, and the other end is the turbulence plate 4D away from the pile foundation body.

[0011] On the positive direction and the negative direction of the X axis, a space composed of the tangent line and the circumference of circle n is formed respectively, and in each space, a plurality of columns of turbulence plates are arranged parallel to the Y axis direction, and the distance between adjacent turbulence plates in the X axis direction is the same.

[0012] The height of the turbulence plate on the concentric circle gradually decreases from the origin.

[0013] In the space composed of the tangent line and the circumference of circle n, the height of the turbulence plate gradually decreases from the origin.

[0014] The height of the turbulence plate is ≦1.5D.

[0015] Further, the turbulence plate is in the shape of a semicircular arc, the central angle of the semicircular arc is 120°, the arc surface is perpendicular to the XOY plane, and the concave surface faces the pile foundation body.

[0016] The bottom of the turbulence plate is provided with a fixed plate, and a plurality of fixed screws are inserted into the seabed after penetrating the fixed plate.

[0017] The fixed plate is a circular plate, and the midpoint of the line parallel to the XOY plane between the two sides of the semicircular arc of the turbulence plate coincides with the center of the fixed plate.

[0018] Further, four concentric circles are sequentially arranged with the central axis of the pile foundation body as the center line, i.e. n=4, and the distance between each concentric circle and the pile foundation body is 0.5D, 1.0D, 1.5D and 2.0D respectively.

[0019] 12 pieces of spoiler plates are evenly arranged on each concentric circle, the water flow direction is 0°, the clockwise direction is positive, the arrangement positions of 12 pieces of spoiler plates on circle 1 and circle 3 are 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, 330° respectively, the arrangement positions of 12 pieces of spoiler plates on circle 2 and circle 4 are 15°, 45°, 75°, 105°, 135°, 165°, 195°, 225°, 255°, 285°, 315°, 345° respectively;

[0020] Further, from the pile foundation body, the heights of spoiler plates of four concentric circles are 1.5D, 1.25D, 1D, 0.75D respectively, the height of spoiler plate closest to circle 4 of tangent part is 0.5D;

[0021] Further, in the space formed by tangent and circle n circumference, spoiler plates are arranged at three quarter points of tangent respectively, four columns of spoiler plates are arranged parallel to Y axis direction, the spoiler plate at the position of 4D from pile foundation body is defined as first column, second column, third column and fourth column are arranged in sequence;

[0022] In the second column, a spoiler plate is arranged at the intersection of Y axis and X axis; in the third column, a spoiler plate is arranged at each of three quarter points of the line connecting two spoiler plates on the tangent along Y axis direction;

[0023] Further, the center of the central angle corresponding to the semicircular arc of the plurality of spoiler plates distributed along the circle n coincides with the circumference of the circle n.

[0024] Further, 8 threaded holes are formed on the bottom fixing plate of the spoiler plate located on circle 1 and circle 2, 4 threaded holes are formed on the bottom fixing plate of the remaining spoiler plates, and the threaded holes are evenly distributed along the circumference of the fixing plate;

[0025] A fixing screw is inserted into each threaded hole;

[0026] According to the construction method of the spoiler system for slowing down the scouring and erosion of the seabed around the offshore wind turbine pile foundation, the specific steps are as follows:

[0027] Step S1, the installation point of the concentric circle partial spoiler is designed, taking the pile foundation body as the center, four concentric circles with a distance of 0.5D, 1.0D, 1.5D and 2.0D from the pile foundation body are designed, which are defined as circle 1, circle 2, circle 3 and circle 4 respectively, 12 point positions are arranged along the circumference of each concentric circle, two point positions on the X axis in the circle 1 are 1-1, two point positions on the Y axis are 1-4, two point positions at 30° with the X axis are 1-2, two point positions at 60° with the X axis are 1-3, two point positions on the X axis in the circle 3 are 3-1, two point positions on the Y axis are 3-4, two point positions at 30° with the X axis are 3-2, two point positions at 60° with the X axis are 3-3, four point positions at 15° with the X axis in the circle 2 are 2-1, four point positions at 15° with the Y axis are 2-3, the point positions 2-2 are evenly distributed between 2-1 and 2-3, four point positions at 15° with the X axis in the circle 4 are 4-1, four point positions at 15° with the Y axis are 4-3, the point positions 4-2 are evenly distributed between 4-1 and 4-3, and D is the diameter of the pile foundation body;

[0028] Step S2, the installation point of the external partial spoiler is designed, two symmetrical point positions 5-1 are designed at a distance of 4D from the pile foundation body, the connecting line of the point position 5-1 and the point position 4-2 is the tangent of the circle 4, three point positions are arranged at the three quarter points of the tangent, which are 5-2, 5-3 and 5-4 from 5-1 in sequence, the connecting line formed between the two point positions 5-2 is perpendicular to the X axis, and the point position 5-5 is arranged at the intersection point, the connecting line formed between the two point positions 5-3 is perpendicular to the X axis, and the point position 5-7 is arranged at the intersection point, and the center position of the connecting line formed by 5-3 and 5-7 is the point position 5-6;

[0029] Step S3, the fixed plates are installed in the order of point positions 4-3, 4-2, 5-4, 5-3, 5-2, 5-1, 3-4, 3-3, 3-2, 4-1, 5-6, 5-5, and the spoilers are vertically fixed on the fixed plates, the centers of the circular arc concave surfaces of the spoilers are located on the circumferences of the circle 1 or the circle 2 or the circle 3 or the circle 4;

[0030] Step S4, the fixed plates are continuously installed in the order of point positions 2-3, 2-2, 2-1, 3-1, 1-4, 1-3, 1-2, 1-1, and the spoilers are vertically fixed on the fixed plates, the centers of the circular arc concave surfaces of the spoilers are located on the circumferences of the circle 1 or the circle 2 or the circle 3 or the circle 4, and the construction and installation of the spoiler system are completed.

[0031] Through the above technical scheme, compared with the prior art, the present application has the following beneficial effects:

[0032] 1. The turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application is arranged layer by layer around the center of the pile foundation body as the center of a circle, and a tangent is drawn from the two symmetric points outside the concentric circle, and the turbulence plates are arranged layer by layer in the range of the tangent, most of the water flow is guided to the outside of the tangent, and the water flow passes through the multiple layers of turbulence plates, so that the water flow energy is greatly weakened, and the erosion effect on the seabed soil around the pile foundation is reduced.

[0033] 2. The turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application, the height of the guide plates in the concentric circle or the range of the tangent gradually increases from the outside to the direction of the pile foundation body, so that the water flow passes through the outermost turbulence plate, and the part of the water flow close to the seabed loses energy to form a small local horseshoe vortex, and in the process close to the pile foundation body, the height of the water flow forming the local horseshoe vortex also increases due to the continuous increase of the height of the turbulence plate, and the water flow energy loss also increases; the water flow energy, especially the energy of the bottom water flow, is greatly lost when it reaches the pile foundation body, and the horseshoe vortex formed around the pile foundation body by this part of the water flow is very limited, so that the scouring ability is greatly reduced.

[0034] 3. The turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application, the convex outward design diffuses the impact water flow, so that the impact water flow retains most of the energy and momentum after impacting the turbulence plate, reducing the energy and momentum applied to the turbulence plate when the impact water flow impacts the turbulence plate.

[0035] 4. The construction method of the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application, the installation sequence follows the principle of from outside to inside, and is divided into multiple layers of progressive construction, the outer turbulence plate is installed first, and the acceleration phenomenon and water flow turbulence caused by the impact of water flow on the turbulence plate are fully considered, so as to avoid the interference of the installation of other turbulence plates and provide more stable water flow conditions for the installation of internal turbulence plates. DETAILED DESCRIPTION

[0036] The present application will be further described below in combination with the drawings and examples.

[0037] Figure 1 is a perspective view of the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application;

[0038] Figure 2 is a top view of the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application;

[0039] Figure 3 is a perspective view of the turbulence plate in the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbines provided by the present application;

[0040] Figure 4is the installation top view of the inner spoiler in the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbine provided by the application;

[0041] Figure 5 is the installation top view of the outer spoiler in the turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbine provided by the application.

[0042] In the figure: 1 is the pile foundation body, 2 is the spoiler, 3 is the fixing screw, and 4 is the solidified soil. DETAILED DESCRIPTION

[0043] The application will be further described in detail in combination with the drawings. In the description of the present application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, and therefore cannot be understood as a limitation on the application. The specific dimensions used in the embodiments are only for the purpose of illustrating the technical solutions and do not limit the protection scope of the application.

[0044] As set forth in the background, weakening the water flow energy of the horseshoe vortex is an important means to prevent the seabed around the pile foundation from being eroded, and therefore the application provides a turbulence system for slowing down the scouring and erosion of the seabed around the pile foundation of offshore wind turbine, which is arranged in the form of an array of spoilers 2, which destroys the original downflow and horseshoe vortex.

[0045] Overall, the turbulence system provided by the application includes two parts, the first part is defined as a concentric circle part, which is arranged close to the pile foundation body 1, and the second part is defined as a tangent part, which is located at the periphery of the concentric circle part. For the convenience of description, the center of the bottom surface of the pile foundation body is taken as the origin, the cross section is XOY plane composed of X axis and Y axis, the central axis direction of the pile foundation body is Z axis, and a three-dimensional coordinate system is constructed, in which the dominant water flow direction is defined as the positive direction of X axis.

[0046] The concentric circle part defines the diameter of the pile foundation body as D, and several layers of concentric circles are distributed outward around the central axis of the pile foundation body, which are respectively defined as circle 1, circle 2, …, circle n, wherein circle n is the farthest concentric circle from the pile foundation body, and the distance between circle n and the pile foundation body is ≦2D.

[0047] The tangent portion, a plurality of spoiler plates are arranged along the circumference of each concentric circle, on the X axis, a spoiler plate is symmetrically arranged at a position 4D away from the pile foundation body, four tangent lines are drawn from the circle n, one end of each tangent line is located at the circle n, and the other end is the spoiler plate at a position 4D away from the pile foundation body; on the positive direction and the negative direction of the X axis, a space composed of the tangent line and the circumference of the circle n is formed respectively, and a plurality of columns of spoiler plates are arranged in each space in parallel to the Y axis direction, and the distances between adjacent spoiler plates in the X axis direction are the same.

[0048] Here, the range of the distance of the circle n from the pile foundation body and the angle of the tangent line is set because, generally speaking, under the action of strong wave flow, the maximum scour depth around the pile is about 1.0-1.2 times the diameter of the pile, and the underwater rest angle of seabed sediment is 31-34°, so it is believed that the scour pit radius is about 1.73 times the scour depth, and the distance of the circle n from the pile foundation body is considered to be ≦2D, and the other end of the tangent line is at a position 4D away from the pile foundation body.

[0049] The entire system is viewed from above as Figure 2 As shown, a horseshoe-shaped arrangement is adopted, the water flow passes through the spoiler plates of the tangent portion, and is guided to both sides of the spoiler plates layer by layer, most of the water flow is guided to the outside of the tangent, and the part of the water flow close to the seabed loses energy to form a small local horseshoe vortex, the internal water flow passes through the multiple layers of spoiler plates, and the accelerated flow formed is guided again on the flow surface of the spoiler plate close to the pile foundation body, so that the water flow energy is greatly weakened, and the erosion effect on the seabed soil around the pile foundation is reduced.

[0050] Considering the spoiler effect, material cost and installation period, preferably, four concentric circles are sequentially arranged with the central axis of the pile foundation body as the center line, i.e. n=4, the distances of each concentric circle from the pile foundation body are 0.5D, 1.0D, 1.5D and 2.0D respectively; 12 spoiler plates are uniformly arranged on each concentric circle, the leading water flow direction is 0°, and the clockwise direction is positive, the arrangement directions of the 12 spoiler plates on the circle 1 and the circle 3 are 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300° and 330° respectively, and the arrangement directions of the 12 spoiler plates on the circle 2 and the circle 4 are 15°, 45°, 75°, 105°, 135°, 165°, 195°, 225°, 255°, 285°, 315° and 345° respectively.

[0051] In the space formed by the tangent line and the circumference of the circle n, the spoiler plates are arranged along the three quarter points of the tangent line, and four columns of spoiler plates are arranged parallel to the Y-axis direction. The spoiler plates located at a distance of 4D from the pile foundation body are defined as the first column, and the second column, the third column and the fourth column are sequentially arranged. In the second column, a spoiler plate is arranged at the intersection of the Y-axis and the X-axis. In the third column, three spoiler plates are arranged at the three quarter points of the line connecting the two spoiler plates on the tangent line along the Y-axis direction.

[0052] The above preferred arrangement focuses on protecting the impact erosion of the reciprocating flow in the tangent line part. The spoiler plates first resist the incoming flow and disperse the flow to both sides. The spoiler plates in the concentric circle part resist the dispersed flow and continue to protect the flow erosion from all directions. The use of the number of spoiler plates can be reduced while maintaining the required spoiler effect, the material cost and the installation period can be reduced, and the maximum economic benefit can be achieved.

[0053] After the arrangement design of the spoiler plates of the system is completed, the height of the spoiler plates also needs to be reasonably designed. As shown in the Figure 1 , the height of the spoiler plates located on the concentric circles gradually decreases from the origin. In the space formed by the tangent line and the circumference of the circle n, the height of the spoiler plates gradually decreases from the origin. This is because in the process of approaching the pile foundation body, the height of the local horseshoe vortex formed by the spoiler plates also increases, and the energy of the water flow consumed also increases. The energy of the water flow reaching the pile foundation body, especially the energy of the bottom water flow, is greatly consumed. The horseshoe vortex formed by this part of the water flow around the pile foundation is very limited, which greatly reduces its scouring ability.

[0054] According to the existing physical model experiment, it is observed by PIV that the flow is divided at 1.5D on the water side of the pile. The flow below this value flows downward and produces a scouring effect. Therefore, the height of the spoiler plate is set to be ≦1.5D. Preferably, considering that the outermost spoiler plate (the lowest height) is not required to be limited, and combining the material cost and the spoiler effect, the heights of the spoiler plates of the four concentric circles are taken as 1.5D, 1.25D, 1D and 0.75D from the pile foundation body, and the height of the spoiler plate closest to circle 4 in the tangent line part is taken as 0.5D.

[0055] In order to achieve the best effect of the spoiler, the application also provides a structural diagram of the spoiler plate, as shown in Figures 3-5As shown, the spoiler is in the shape of a semicircular arc, and the central angle of the semicircular arc is 120°. The arc surface is perpendicular to the XOY plane, and the concave surface faces the pile foundation body. The design of the spoiler is to maximize the protection of the seabed around the pile foundation. The convex surface outwardly designed will diffuse the impact of the water flow, so that the impact of the water flow retains most of the energy and momentum after impacting the spoiler, reducing the energy and momentum applied to the spoiler when the impact water flow impacts the spoiler. Therefore, this helps to reduce the need for fixing the spoiler, reduce maintenance costs, and improve the stability and service life of the structure.

[0056] When installing and fixing the spoiler, a fixing plate is provided at the bottom of the spoiler. There are many fixing methods, as long as they are firm. The fixing plate is a circular plate, and the midpoint of the line parallel to the XOY plane between the two sides of the semicircular arc of the spoiler coincides with the center of the fixing plate. A plurality of spoilers distributed along the circle n, the center of the central angle of the semicircular arc coincides with the circumference of the circle n.

[0057] A plurality of fixing screws 3 are inserted into the seabed after being provided in the fixing plate to fix the spoiler. According to the actual working conditions, the installation form of the fixing screw is also adjusted accordingly. The spoilers located on the circle 1 and the circle 2, Figure 4 As shown, 8 threaded holes are provided on the fixing plate at the bottom, and the rest of the spoilers, Figure 5 As shown, 4 threaded holes are provided on the fixing plate at the bottom, and the rest of the spoilers,

[0058] This is because the height of the spoiler around the pile foundation body is high, and the force and overturning moment it bears are also relatively large, so it needs higher fixing capacity and needs to use more fixing screws to achieve it to ensure the stability and durability of the spoiler. The use of fewer fixing screws in the peripheral area not only saves costs, but also reduces the difficulty of installation.

[0059] Finally, the application also provides a construction method of the spoiler system for slowing down the erosion of the seabed around the offshore wind turbine pile foundation. The entire construction and installation sequence follows the principle of from outside to inside, and is divided into multiple layers of progressive construction. First, install the outer spoiler, which can provide more stable water flow conditions for the installation of the internal spoiler.

[0060] Before the construction of the offshore wind turbine pile foundation body, detailed site survey is carried out, including seabed topography, current direction and speed, etc., and the layout area of the spoiler is planned to ensure that the layout area can effectively cover the seabed around the wind turbine pile foundation body. The accurate position of the pile foundation body is determined by using a positioning system, and the center point of the wind turbine pile foundation body on the seabed is marked as a reference point for subsequent layout of the spoiler. At the same time, the silt around the pile foundation body is treated to become hardened seabed soil, which can be reinforced by solidified soil 4.

[0061] The specific steps are as follows:

[0062] Step S1, design the installation point of the concentric circle part spoiler, take the pile foundation body as the center, and design four concentric circles at a distance of 0.5D, 1.0D, 1.5D and 2.0D from the pile foundation body, respectively defined as circle 1, circle 2, circle 3 and circle 4, 12 point positions are arranged along the circumference of each concentric circle, two point positions on the X axis in circle 1 are 1-1, two point positions on the Y axis are 1-4, two point positions at 30° to the X axis are 1-2, and two point positions at 60° to the X axis are 1-3, two point positions on the X axis in circle 3 are 3-1, two point positions on the Y axis are 3-4, two point positions at 30° to the X axis are 3-2, and two point positions at 60° to the X axis are 3-3, four point positions at 15° to the X axis in circle 2 are 2-1, four point positions at 15° to the Y axis are 2-3, and point positions 2-2 are evenly distributed between 2-1 and 2-3, four point positions at 15° to the X axis in circle 4 are 4-1, four point positions at 15° to the Y axis are 4-3, and point positions 4-2 are evenly distributed between 4-1 and 4-3, D is the diameter of the pile foundation body;

[0063] Step S2, design the installation point of the external part spoiler, design point 5-1 at two symmetrical points 4D away from the pile foundation body, the connecting line of point 5-1 and point 4-2 is the tangent of circle 4, three quarter points on the tangent are respectively set as point 5-2, 5-3 and 5-4 from 5-1, the connecting line between two point 5-2 is perpendicular to the X axis at the intersection point, and point 5-5 is set at the intersection point, the connecting line between two point 5-3 is perpendicular to the X axis at the intersection point, and point 5-7 is set at the intersection point, and the center position of the connecting line formed by 5-3 and 5-7 is point 5-6;

[0064] Step S3, install the fixed plate according to the order of point 4-3, 4-2, 5-4, 5-3, 5-2, 5-1, 3-4, 3-3, 3-2, 4-1, 5-6, 5-5, and vertically fix the spoiler on the fixed plate, the central angle of the arc concave surface of the spoiler is located on the circumference of circle 1 or circle 2 or circle 3 or circle 4;

[0065] Step S4, continue to install the fixed plate according to the sequence of points 2-3, 2-2, 2-1, 3-1, 1-4, 1-3, 1-2, 1-1, and vertically fix the spoiler plate on the fixed plate. The center of the circular arc concave surface of the spoiler plate corresponds to the circumference of circle 1 or circle 2 or circle 3 or circle 4, and the construction and installation of the spoiler system are completed.

[0066] According to the installation sequence provided in steps S3 and S4, the acceleration phenomenon and water flow turbulence phenomenon caused by the water flow impacting the spoiler plate are mainly considered to avoid interference with the installation of other spoiler plates. Because the outer layer has provided the necessary protection for the interior, after the spoiler plate installed and fixed on the outside, the installation of the interior spoiler plate will be easier to carry out. This installation sequence helps to improve the construction efficiency and reduce the risk in the installation process.

[0067] After the construction is completed, the stability of the spoiler plate is regularly monitored and necessary maintenance is carried out. The monitoring content includes the position, angle and fixing condition of the spoiler plate. All data in the layout process of the spoiler plate are recorded, including the layout position, layout time, the number of fixed screws used, etc. The monitoring data is analyzed to evaluate the layout effect of the spoiler plate and provide a basis for subsequent optimization.

[0068] In summary, the arrangement of the spoiler system provided in the present application can slow down the erosion of the seabed around the offshore wind turbine pile foundation, destroy the original downflow and horseshoe vortex system, and set a wide range of spoiler plates in the direction of the reciprocating flow far from the wind turbine pile foundation body. More dense and higher spoiler plates are arranged within one pile diameter around the pile foundation body to focus on protecting the bed surface around the pile foundation body. It has strong universality and can be used in different terrains and environments, especially for reciprocating flow.

[0069] Those skilled in the art can understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0070] The meaning of "and / or" described in the present application includes both the case of each existence alone and the case of both existence.

[0071] The meaning of "connection" described in the present application can be direct connection between components or indirect connection between components through other components.

[0072] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A turbulence system for mitigating scour erosion around a pile foundation of an offshore wind turbine, comprising a pile foundation body, characterized in that: a three-dimensional coordinate system is constructed with the center of the bottom surface of the pile foundation body as the origin, the cross section as the XOY plane formed by the X-axis and the Y-axis, and the central axis direction of the pile foundation body as the Z-axis, wherein the dominant water flow direction is defined as the positive direction of the X-axis; Define the diameter of the pile foundation body as D. Around the central axis of the pile foundation body, several concentric circles are distributed outward, defined as circle 1, circle 2, ... circle. n Among them, circle n The concentric circles furthest from the pile foundation body, and the circles... n The distance from the pile foundation body is ≤2D; Each concentric circle is provided with a plurality of spoiler plates along the circumference. In the X axis, a spoiler plate is symmetrically arranged at a position 4D away from the pile foundation body 4. Four tangent lines are drawn from the position, and one end of each tangent line is located at the circle n , and the other end is the spoiler plate at the position 4D away from the pile foundation body 4. n ​ Located in the positive and negative directions of the X-axis, respectively forming a region composed of tangents and circles. n The space formed by the circumference has several rows of spoilers arranged parallel to the Y-axis in each space, and the spacing between adjacent spoilers is the same in the X-axis direction. turbulence plates are located on several concentric circles, and the height of the turbulence plates gradually decreases from the origin; At the tangent and the circle n The space formed by the circumference gradually reduces the height of the spoiler from the origin. the height of the turbulence plates is ≦1.5D.

2. A turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation according to claim 1, characterized in that: the turbulence plates are in the shape of a semicircular arc, the central angle of the semicircular arc is 120°, the arc surface is perpendicular to the XOY plane, and the concave surface faces the pile foundation body; a fixed plate is provided at the bottom of the turbulence plate, and several fixed screws are inserted into the seabed after being threaded through the fixed plate; the fixed plate is a circular plate, and the midpoint of the line parallel to the XOY plane between the two sides of the semicircular arc of the turbulence plate coincides with the center of the fixed plate.

3. A turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation according to claim 2, characterized in that: four concentric circles are sequentially arranged with the central axis of the pile foundation body as the center line, i.e. n=4, and the distance of each concentric circle from the pile foundation body is 0.5D, 1.0D, 1.5D, and 2.0D, respectively; 12 turbulence plates are uniformly arranged on each concentric circle, and the arrangement direction of the 12 turbulence plates on circle 1 and circle 3 is 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°, respectively, and the arrangement direction of the 12 turbulence plates on circle 2 and circle 4 is 15°, 45°, 75°, 105°, 135°, 165°, 195°, 225°, 255°, 285°, 315°, and 345°, respectively.

4. A turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation according to claim 3, characterized in that: The heights of the turbulence plates of the four concentric circles are 1.5D, 1.25D, 1D, and 0.75D, respectively, starting from the pile foundation body, and the height of the turbulence plate closest to circle 4 is 0.5D.

5. The turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation according to claim 2, characterized in that: At the tangent and the circle n In the space formed by the circumference, the spoiler plates are arranged along the three quarter points of the tangent, four rows of spoiler plates are arranged parallel to the Y-axis direction, and the spoiler plates located at 4D positions from the pile foundation body are defined as the first row, and the second row, the third row and the fourth row are sequentially arranged. In the second column, a turbulence plate is arranged at the intersection of the Y-axis and the X-axis; in the third column, a turbulence plate is arranged at each of the three quarter points of the line connecting the two turbulence plates on the tangent along the Y-axis direction.

6. The turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation of claim 2, wherein: Along the circle n Several spoiler plates are distributed, the semicircular arcs of which coincide with the center of the circle and the circumference of the circle n corresponding to the central angle of the circle.

7. The turbulence system to mitigate scour erosion around a seabed of an offshore wind turbine monopile foundation according to claim 2, characterized in that: On the turbulence plates located on circle 1 and circle 2, 8 threaded holes are formed on the fixed plate at the bottom of the turbulence plate, and 4 threaded holes are formed on the fixed plate at the bottom of the remaining turbulence plates, and the threaded holes are uniformly distributed along the circumference of the fixed plate; a fixed screw is inserted into each threaded hole.

8. A method of installing a turbulence system according to any one of claims 1 to 7 to mitigate scour around a monopile foundation of an offshore wind turbine, characterised in that: The specific steps are as follows: Step S1, the installation point of the concentric circle partial spoiler is designed, taking the pile foundation body as the center, four concentric circles with a distance of 0.5D, 1.0D, 1.5D and 2.0D from the pile foundation body are designed, which are defined as circle 1, circle 2, circle 3 and circle 4, 12 point positions are arranged along the circumference of each concentric circle, two point positions on the X axis in the circle 1 are 1-1, two point positions on the Y axis are 1-4, four point positions at 30° with the X axis are 1-2, four point positions at 60° with the X axis are 1-3, two point positions on the X axis in the circle 3 are 3-1, two point positions on the Y axis are 3-4, four point positions at 30° with the X axis are 3-2, four point positions at 60° with the X axis are 3-3, four point positions at 15° with the X axis in the circle 2 are 2-1, four point positions at 15° with the Y axis are 2-3, the point positions 2-2 are evenly distributed between 2-1 and 2-3, four point positions at 15° with the X axis in the circle 4 are 4-1, four point positions at 15° with the Y axis are 4-3, the point positions 4-2 are evenly distributed between 4-1 and 4-3, and D is the diameter of the pile foundation body; Step S2, the installation point of the external partial spoiler is designed, two symmetrical point positions 5-1 are designed at a distance of 4D from the pile foundation body, the connecting line of the point position 5-1 and the point position 4-2 is the tangent of the circle 4, three point positions are arranged at the three quarter points of the tangent, which are 5-2, 5-3 and 5-4 in sequence from 5-1, the connecting line between the two point positions 5-2 is perpendicular to the X axis, and the point position 5-5 is arranged at the intersection point, the connecting line between the two point positions 5-3 is perpendicular to the X axis, and the point position 5-7 is arranged at the intersection point, and the center position of the connecting line formed by 5-3 and 5-7 is the point position 5-6; Step S3, the fixed plates are installed in the order of 4-3, 4-2, 5-4, 5-3, 5-2, 5-1, 3-4, 3-3, 3-2, 4-1, 5-6, 5-5, and the spoilers are vertically fixed on the fixed plates, the center angles of the spoiler arc concave surfaces correspond to the centers of the circles 1, 2, 3 or 4 on the circumference; Step S4, the fixed plates are continuously installed in the order of 2-3, 2-2, 2-1, 3-1, 1-4, 1-3, 1-2, 1-1, and the spoilers are vertically fixed on the fixed plates, the center angles of the spoiler arc concave surfaces correspond to the centers of the circles 1, 2, 3 or 4 on the circumference, and the construction and installation of the spoiler system are completed.

Images