Offshore wind power single pile foundation based on cemented riprap and offshore wind power device

Abstract

The invention discloses an offshore wind power single pile foundation based on a cemented riprap body and an offshore wind power device. The offshore wind power single pile foundation comprises a pile foundation, a protective sleeve arranged on the outer side of the pile foundation in a sleeving mode, a turbulent flow assembly installed on the protective sleeve and a protective assembly located on the periphery of the protective sleeve. The impact force of sea waves is gradually weakened through the protection assemblies, the impact force borne by the pile foundation is reduced, pore water in a gravel soil layer is guided to be directionally released in the vertical direction, soil liquefaction is avoided, the situation that the sea waves drive gravel near the pile foundation to impact the pile foundation is avoided, the stability of the pile foundation is further maintained, and the service life of the pile foundation is prolonged. Sea waves buffered by the protection assembly enter the turbulent flow assembly, a spinning disturbance effect can be generated under the action of sea wave fluid, fluid kinetic energy originally impacted on the root of a pile foundation in a concentrated mode is converted into streaming type vortex disturbance, and therefore the bottom flow speed is effectively weakened, local scouring force is reduced, and formation of scouring pits is restrained; and the stability of the pile foundation is further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore wind power monopile foundation based on a cemented riprap body and an offshore wind power device. Background Art

[0002] As a clean and environmentally friendly renewable energy source, offshore wind power has been vigorously developed in recent years. In the field of offshore wind power, with the continuous development of wind power technology and the advancement of offshore wind farms to deep sea, and with the construction of a large number of offshore wind turbine piles, the local scouring around the wind turbine pile foundations caused by wind, current and wave loads has gradually attracted attention; the reason for pile foundation scouring is that the cylindrical structure changes the water flow state, forming a horseshoe-shaped vortex around the pile, which starts to entrain the soil upward, causing the soil around the pile to be lost, and finally forming a scour pit. The existence of the scour pit will seriously damage the bearing capacity of the pile foundation and the vibration frequency of the wind turbine, causing significant losses.

[0003] To mitigate these adverse effects, existing technologies attempt to protect foundations using measures such as casing, force dissipation blocks, grids, and ballast devices. However, these methods often suffer from difficulties in construction, strong material dependence, and poor scour resistance. In recent years, cemented riprap, a structurally stable and highly controllable reinforcement, has been gradually applied to underwater foundations. By arranging blocks of stone around the pile foundation and injecting a cementing material, this reinforced structure possesses a certain degree of integrity and permeability. This structure effectively enhances the seabed's resistance to scour and liquefaction, demonstrating excellent engineering adaptability.

[0004] However, the aforementioned scour protection for offshore wind turbine foundations suffers from limited functionality and poor scour prevention effectiveness. Even after reinforcement using the aforementioned reinforcement methods, scour and soil erosion still occur in the area surrounding the piles. Therefore, it is necessary to design an offshore wind turbine monopile foundation and offshore wind turbine installation based on cemented riprap to address these issues. Summary of the Invention

[0005] The present invention overcomes the deficiencies of the prior art and provides an offshore wind power monopile foundation based on a cemented riprap body and an offshore wind power device.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: an offshore wind power monopile foundation based on cemented riprap, comprising: a pile foundation, a protective sleeve sleeved outside the pile foundation, a spoiler component mounted on the protective sleeve, and a protective component located around the protective sleeve;

[0007] The spoiler assembly includes: a rotating ring, and a plurality of paddles mounted on the rotating ring; the rotating ring is rotatably mounted on the outer side of the protective sleeve and is rotatably connected thereto; the plurality of paddles are evenly radially arranged along the outer circumference of the rotating ring, and the paddles are curved rectangular structures, and the top of each paddle has a preset inclination angle, with the inclination direction being in the direction of the curved path of the paddle;

[0008] The protective assembly includes: a support ring, a plurality of support rods arranged on the outer periphery of the support ring, and a plurality of drainage parts arranged on the support rods; the support ring is sleeved on the outer periphery of the pile foundation and fixedly connected thereto, and the plurality of drainage parts are evenly distributed along the extension direction of the support rods, and the drainage parts induce the discharge of pore water in the gravel soil layer.

[0009] In a preferred embodiment of the present invention, the top of the paddle is inclined at an angle of 45°-60° to the horizontal plane.

[0010] In a preferred embodiment of the present invention, the drainage member includes: a fixed column, a plurality of exhaust pipe groups installed on the fixed column, and an exhaust unit for controlling the exhaust pipe groups to exhaust; the fixed column is a cavity structure;

[0011] The exhaust pipe group includes a plurality of exhaust cavities, and the plurality of exhaust cavities surround the outer periphery of the fixed column. The plurality of exhaust pipe groups are evenly distributed along the extension direction of the fixed column, and adjacent exhaust pipe groups are alternately distributed;

[0012] An exhaust hole is provided on a side of the exhaust cavity away from the fixing column;

[0013] The exhaust part includes: a plurality of drive units; each of the drive units corresponds to one exhaust pipe group.

[0014] In a preferred embodiment of the present invention, the driving unit comprises: a plurality of pistons and a plurality of connecting rods; one end of the connecting rod is hinged to the piston, and the other end is hinged to the other connecting rods via a rotating column, both ends of the rotating column pass through the plurality of connecting rods, both ends of the connecting rod are fixedly mounted with a slot plate, and the connecting rod is fixed to one end of the slot plate;

[0015] A connecting column is provided between adjacent drive units, and the connecting column is fixedly connected to the slot plate of the adjacent drive unit. The drive unit located at the bottom of the fixed column is rotatably connected to the fixed column through the connecting column. The connecting column on the drive unit located at the top of the fixed column passes through the fixed column. A driving part is provided on the connecting column located outside the fixed column, which is used to receive the impact force of the waves to control the operation of the drive unit.

[0016] In a preferred embodiment of the present invention, the slot plate is in a slot shape, and the midpoint of the slot plate is located at the axis position of the fixing column, and the connecting column is coaxially arranged with the fixing column.

[0017] In a preferred embodiment of the present invention, the driving part includes: a pressure column, and a plurality of blades installed on the pressure column; the pressure column is coaxially fixed with the connecting column, and the plurality of blades are evenly radially arranged along the periphery of the pressure column, and the blades are a curved rectangular structure.

[0018] In a preferred embodiment of the present invention, a plurality of connecting rings are provided on the plurality of support rods, the plurality of connecting rings are coaxial with the protective sleeves, and the plurality of connecting rings are nested in each other and fixed to the plurality of support rods.

[0019] In a preferred embodiment of the present invention, a protective net structure is formed between the plurality of support rods and the plurality of connecting rings.

[0020] In a preferred embodiment of the present invention, a one-way valve structure is provided at the exhaust hole.

[0021] An offshore wind power device includes the offshore wind power monopile foundation based on cemented riprap provided above.

[0022] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0023] (1) The present invention provides an offshore wind power single pile foundation based on a cemented riprap body. Through the arrangement of a protective component and a spoiler component, a complementary coupling mechanism is formed in structure and function, which significantly enhances the anti-scouring property, stability and durability of the pile foundation in a complex marine environment. The protective component is used to gradually weaken the impact force of the waves, thereby reducing the impact force on the pile foundation, and guiding the pore water in the gravel layer to be released in a vertical direction, thereby avoiding the formation of soil liquefaction, thereby preventing the waves from driving the gravel near the pile foundation to impact the pile foundation, and further maintaining the stability of the pile foundation. The waves buffered by the protective component enter the spoiler component, which can produce a spin disturbance effect under the action of the wave fluid, so that the fluid kinetic energy originally concentrated on the root of the pile foundation is converted into a vortex disturbance of the surrounding flow, thereby effectively weakening the bottom flow velocity, reducing the local scouring force, and inhibiting the formation of "scouring pits", thereby further ensuring the stability of the pile foundation.

[0024] (2) The present invention provides an offshore wind power single pile foundation based on a cemented riprap body. By setting up an exhaust part, the driving part is used to collect the power generated by the waves, so that the driving unit is in operation, and the exhaust chamber is exhausted in the gravel soil layer. During the rising process of the bubbles, the local water flow is pulled and disturbed, and an additional seepage channel is provided for the gravel soil layer, so that the pore water pressure escapes upward in time, and the liquefaction state in which the water pressure accumulates to be equal to the total vertical stress and causes the soil to lose its rigidity is avoided; at the same time, the particle-water-air interaction under the two-phase flow field increases the friction resistance and cohesion between the particles, so that the soil can still maintain a certain shear strength under cyclic load, further avoiding the liquefaction of the gravel soil layer under the impact of waves, preventing the waves from driving the gravel to impact the pile foundation, and improving the stability of the pile foundation.

[0025] (3) The present invention provides an offshore wind power single pile foundation based on a cemented riprap body. By setting a paddle and a rotating ring, it rotates under the impact of waves, guiding the formation of a spiral water flow, which can generate continuous disturbance around the pile foundation, helping to dissipate pore water pressure and induce drainage. At the same time, the generated spiral water flow can further offset the subsequent impact force of waves, avoiding direct impact of waves on the pile foundation, and improving the stability of the pile foundation. The setting of the inclination angle of the top of the paddle can induce floating gravel particles to rotate and deposit in the direction of the pile bottom, forming a dense sedimentation zone at the pile bottom, and preventing the soil flow and cavitation at the bottom of the pile foundation.

[0026] (4) The present invention forms a spatial surrounding mesh structure on the periphery of the pile foundation by setting a plurality of support rods and a plurality of the above-mentioned connecting rings, which effectively resists the direct scouring effect of the high-speed water flow generated by the impact of waves on the roots of the pile foundation. Sand and fine particles are blocked or slowed down outside the structure, which greatly reduces the local flow velocity at the bottom, delays the formation and development process of the scouring pit, and thus improves the scouring resistance of the single pile foundation during long-term service, and avoids the loss of sand and gravel caused by the impact of waves. At the same time, the driving parts arranged on the support rods gradually become denser toward the pile foundation, forming a ring-shaped turbulence barrier structure. When the waves hit, the blades rotate, generate vortices, guide the deflection of the wave fluid, gradually disperse the kinetic energy, form multi-level turbulence paths and energy dissipation areas, thereby reducing the impact force of the waves, avoiding soil liquefaction, and reducing the risk of concentrated wave kinetic energy attacking the roots of the pile body, further suppressing the local scouring depth.

[0027] (5) The present invention guides the pore water in the gravel soil layer to be released in a vertical direction through the exhaust part, thereby avoiding the liquefaction of the gravel soil layer under the impact of waves, increasing the friction resistance and cohesion between the particles in the gravel soil layer, and thus reducing the gravel particles driven by the impact of waves, effectively avoiding the loss of soil near the pile foundation, and reducing the impact force of waves on the pile foundation, inhibiting the formation of "scour pits", and further improving the stability of the pile foundation. At the same time, the setting of the inclination angle of the top of the paddle can induce the floating gravel particles to rotate and deposit in the direction of the pile bottom, inducing them to rotate and deposit in the direction of the pile bottom, forming a dense sedimentation zone at the pile bottom, and further avoiding the loss of gravel, achieving the effect of multi-level protection of gravel.

[0028] (6) The present invention sets a driving part, and the driving parts are gradually densely arranged toward the pile foundation, which generates vortices under the impact of waves, thereby forming multi-level turbulence paths and energy dissipation areas to reduce the impact force of waves. At the same time, the generated vortices can induce sand and gravel in the waves to settle in the grid of the protective net structure, further realizing sand and gravel protection and suppressing the local scouring depth.

[0029] (7) The present invention arranges exhaust pipe groups, distributes adjacent exhaust pipe groups alternately, and inserts the protruding exhaust cavity laterally into the gravel soil layer, which can increase the stability of the fixed column, improve its vertical pull-out resistance, and thus improve the stability of the protection component installation, thereby improving the stability of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments described in the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0031] Figure 1 It is a three-dimensional structural diagram of a preferred embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the internal structure of a fixed column in a drainage member in a preferred embodiment of the present invention;

[0033] Figure 3 It is a preferred embodiment of the present invention Figure 2 A in the middle is an enlarged schematic diagram;

[0034] In the figure: 1. Pile foundation; 2. Protective sleeve; 3. Rotating ring; 4. Paddle; 5. Support ring; 6. Support rod; 7. Fixed column; 8. Exhaust chamber; 9. Exhaust pipe group; 10. Piston; 11. Connecting rod; 12. Rotating column; 13. Slot plate; 14. Connecting column; 15. Pressure column; 16. Blade; 17. Connecting ring; 18. Exhaust hole. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In areas with highly saturated loose sand or silt layers, or in gravel layers, the accumulation of pore water pressure caused by cyclic wave loads may trigger soil liquefaction. Specifically, the pore water pressure in saturated loose sand increases rapidly, causing the effective stress to approach zero. This causes the soil to behave like a fluid within a short period of time, completely losing its shear strength and bearing capacity. This leads to a sharp drop in soil strength and a loss of effective support, causing the pile foundation 1 structure to deform excessively or even become unstable and overturn.

[0040] like Figure 1 and Figure 2 As shown, the offshore wind power monopile foundation based on cemented riprap includes: a pile foundation 1, a protective sleeve 2 sleeved on the outside of the pile foundation 1, a spoiler component installed on the protective sleeve 2, and a protective component located around the protective sleeve 2;

[0041] The spoiler assembly includes: a rotating ring 3, and a plurality of paddles 4 mounted on the rotating ring 3; the rotating ring 3 is rotatably mounted on the outside of the protective sleeve 2 and is rotatably connected thereto; the plurality of paddles 4 are evenly arranged radially along the outer circumference of the rotating ring 3, and the paddles 4 are curved rectangular structures, with the top of each paddle 4 having a preset inclination angle, and the inclination direction is in the direction of the curved path of the paddle 4; the inclination direction of the top of the paddle 4 is at an angle of 45°-60° to the horizontal plane;

[0042] The protective assembly includes: a support ring 5, a number of support rods 6 arranged on the outer periphery of the support ring 5, and a number of drainage parts arranged on the support rods 6; the support ring 5 is sleeved on the outer periphery of the pile foundation 1 and fixedly connected thereto, and the number of drainage parts are evenly distributed along the extension direction of the support rods 6, and the drainage parts induce the discharge of pore water in the gravel soil layer.

[0043] Cemented riprap is used as the pile foundation 1, and the pile foundation 1 is installed in a gravel layer. The offshore wind power monopile is installed on the pile foundation 1. When the waves on the seabed hit, the waves will first hit the protective components. The protective components will gradually weaken the impact force of the waves, reducing the impact force on the pile foundation 1. The drainage components will guide the pore water in the gravel layer to be released in a vertical direction, avoiding the formation of soil liquefaction caused by the impact of the waves, and further preventing the waves from driving the gravel near the pile foundation 1 to impact the pile foundation 1, further maintaining the stability of the pile foundation 1.

[0044] After being buffered by the protective component, the waves enter the spoiler component and impact the paddle 4. Since the paddle 4 is a curved rectangular structure, the bending direction of several paddles 4 is clockwise. Under the impact of the waves, the rotating ring 3 will be driven to rotate, guiding the formation of a spiral water flow, which can produce a spin disturbance effect under the action of the wave fluid, so that the fluid kinetic energy originally concentrated on the root of the pile foundation 1 is converted into a vortex disturbance of the surrounding flow, thereby effectively weakening the bottom flow velocity, reducing the local scouring force, and suppressing the formation of "scouring pits", further ensuring the stability of the pile foundation 1, and at the same time helping to dissipate the pore water pressure and induce drainage.

[0045] It is worth mentioning that the vortex center of the generated spiral water flow is usually accompanied by a decrease in pressure, which can form a relatively negative pressure area around the pile foundation. The negative pressure "wraps" the structure, which can slow down the speed and impact of the external water flow entering the bottom area of the pile foundation, and constructs a hydrodynamic buffer "shield", which can further offset the subsequent impact force of the waves, avoid the direct impact of the waves on the pile foundation 1, and improve the stability of the pile foundation 1. The setting of the inclination angle of the top of the paddle 4 can induce the floating gravel particles to rotate and deposit in the direction of the pile bottom, forming a dense sedimentation zone at the bottom of the pile, and preventing the bottom of the pile foundation 1 from becoming cavitated.

[0046] like Figure 3 As shown, in the present invention, in order to prevent the soil from liquefying and causing the gravel to float when the waves hit, a drainage device is provided, which includes: a fixed column 7, a plurality of exhaust pipe groups 9 installed on the fixed column 7, and an exhaust unit for controlling the exhaust pipe groups 9 to exhaust; the fixed column 7 is a cavity structure;

[0047] The exhaust pipe group 9 includes a plurality of exhaust cavities 8, and the plurality of exhaust cavities 8 surround the outer periphery of the fixed column 7. The plurality of exhaust pipe groups 9 are evenly distributed along the extension direction of the fixed column 7, and adjacent exhaust pipe groups 9 are alternately distributed.

[0048] An exhaust hole 18 is provided on the side of the exhaust cavity 8 away from the fixing column 7;

[0049] The exhaust part includes: a plurality of drive units; each drive unit corresponds to an exhaust pipe group 9.

[0050] The drive unit includes: a plurality of pistons 10 and a plurality of connecting rods 11; one end of the connecting rod 11 is hinged to the piston 10, and the other end is hinged to the other connecting rods 11 through a rotating column 12. Both ends of the rotating column 12 pass through the plurality of connecting rods 11. Both ends of the connecting rod 11 are fixedly mounted with a slot plate 13, and the connecting rod 11 is fixed to one end of the slot plate 13;

[0051] A connecting column 14 is provided between adjacent drive units, and the connecting column 14 is fixedly connected to the slot plate 13 of the adjacent drive unit. The drive unit located at the bottom of the fixed column 7 is rotatably connected to the fixed column 7 through the connecting column 14. The connecting column 14 on the drive unit located at the top of the fixed column 7 passes through the fixed column 7. A driving part is provided on the connecting column 14 located outside the fixed column 7, which is used to receive the impact force of the waves to control the operation of the drive unit.

[0052] The slot plate 13 is in a slot shape, and the midpoint of the slot plate 13 is located at the axis position of the fixing column 7 . The connecting column 14 is coaxially arranged with the fixing column 7 .

[0053] By driving the connecting column 14 to rotate, and the axis of the connecting column 14 coincides with the midpoint of the slot plate 13, the slot plate 13 rotates at the same time as the connecting column 14 rotates, and one end of the connecting rods 11 is rotatably mounted on one end of the slot plate 13. Therefore, when the slot plate 13 rotates, the slot plate 13 and the end of the connecting rods 11 rotatably mounted thereon will drive the connecting rods 11 to rotate with the axis of the connecting column 14 as the center and the end of the slot plate 13 and the connecting rods 11 rotatably mounted thereon as the radius, thereby driving the connecting rods 11 to swing, and the other ends of the connecting rods 11 are hinged to the relative pistons 10, and the pistons 10 are slidably connected to the exhaust chamber 8, thereby driving the pistons 10 in the exhaust chamber 8. The reciprocating movement compresses the gas in the exhaust chamber 8 and discharges it into the gravel layer through the exhaust hole 18, thereby generating bubbles. During the rising process of the bubbles, the local water flow is pulled and disturbed, providing an additional seepage channel for the gravel layer, so that the pore water pressure escapes upward in time, avoiding the liquefaction state in which the water pressure accumulates to be equal to the total vertical stress and causes the soil to lose its rigidity; at the same time, the particle-water-air interaction under the two-phase flow field increases the friction resistance and cohesion between the particles, so that the soil can still maintain a certain shear strength under cyclic load, further avoiding the liquefaction of the gravel layer under the impact of waves, preventing the waves from driving the gravel to impact the pile foundation 1, and improving the stability of the pile foundation 1.

[0054] It is worth mentioning that the adjacent exhaust pipe groups 9 are distributed alternately, and the protruding exhaust cavity 8 is inserted horizontally into the gravel layer, which can increase the stability of the fixed column 7, improve its vertical pull-out resistance, and thereby improve the stability of the installation of the protective component, thereby improving the stability of the pile foundation 1.

[0055] In the present invention, in order to drive the connecting column 14 to rotate, a driving unit is provided. The driving unit uses the impact force of the waves to drive the connecting column 14 to rotate, thereby causing the exhaust unit to exhaust. The driving unit includes: a pressure column 15, and a plurality of blades 16 installed on the pressure column 15; the pressure column 15 is coaxially fixed to the connecting column 14, and the plurality of blades 16 are evenly radially arranged along the outer periphery of the pressure column 15, and the blades 16 are a curved rectangular structure.

[0056] When the waves hit the blades 16, the blades 16 will drive the pressure column 15 to rotate. The pressure column 15 is fixed coaxially with the connecting column 14, so it will drive the connecting column 14 to rotate, thereby driving the exhaust part to exhaust.

[0057] It is worth mentioning that the drive unit not only provides power for the exhaust unit, but also several drive units form a ring-shaped turbulence barrier structure. When the waves hit the blades 16, they rotate and generate vortices, guiding the deflection of the wave fluid, gradually dispersing the kinetic energy, forming multi-level turbulence paths and energy dissipation areas, thereby reducing the impact force of the waves, avoiding soil liquefaction, and reducing the risk of concentrated wave kinetic energy attacking the roots of the piles, further suppressing the local scouring depth.

[0058] The setting of the driving part is the first line of defense to disperse the impact force of the waves, in order to reduce the impact force of the waves and thus reduce the damage caused by the waves to the pile foundation 1.

[0059] At the same time, several drive units are gradually and densely arranged toward the pile foundation 1. When the waves first hit the outermost drive unit, the wave flow is forced to generate shear and vortex in the annulus between the first-layer drive unit and the pile tube, converting part of the kinetic energy into eddy current dissipation energy. The remaining energy continues to propagate inward. The density of the inner-layer drive units is higher, which means that the water flow has to "pass through" a narrow gap between each layer, consuming part of the remaining energy each time it passes through a layer. The multi-level damping and shear energy dissipation significantly reduce the wave kinetic energy transmitted to the innermost layer close to the pile body, avoiding stress concentration or fatigue damage to the structure due to instantaneous large loads.

[0060] When the spacing between the outer driving parts is wide, the wave current velocity is still high; but after entering the next layer of denser driving parts, the gap decreases and the water flow channel shrinks, causing the local flow velocity to slow down and the vortex to diffuse. The "cascade convergence-diffusion" channel formed by gradually increasing density causes the water flow velocity to decrease in multiple stages and generates multiple vortices at the same time, effectively breaking up the concentrated incoming flow and reducing the scouring speed in a single channel, ultimately reducing the risk of seabed sediment being entrained, and at the same time reducing the shear impact of the fluid around pile foundation 1 on the pile body.

[0061] It should be noted that the connecting column 14 is sealedly connected to the fixing column 7 .

[0062] In the present invention, a plurality of connecting rings 17 are provided on the plurality of support rods 6 . The plurality of connecting rings 17 are coaxial with the protective sleeve 2 , and the plurality of connecting rings 17 are nested in each other and fixed to the plurality of support rods 6 .

[0063] A protective net structure is formed between the supporting rods 6 and the connecting rings 17 .

[0064] The protective net is projected onto the seabed in a ring or grid layout. The overlapping ring structure makes it difficult for sand to be directly washed out of the exhaust area during impact. Instead, a weak stagnation zone will be formed between the connecting rings 17. With the disturbance of bubbles or water flow, the sand in the grid area will gradually diffuse outward or settle, forming a "buffer-deposition" sand bed transition zone from the outside to the inside.

[0065] A spatial surrounding mesh structure is formed on the periphery of the pile foundation 1, which effectively resists the direct scouring effect of high-speed water flow generated by the impact of waves on the root of the pile foundation 1. Sand and gravel and fine particles are blocked or slowed down outside the structure, which greatly reduces the local flow velocity at the bottom and delays the formation and development process of the scouring pit, thereby improving the anti-scouring stability of the single pile foundation 1 during long-term service and preventing it from being affected by the impact of waves and causing the loss of sand and gravel.

[0066] In the present invention, a one-way valve structure is provided at the exhaust hole 18 .

[0067] By providing a one-way valve structure at the exhaust hole 18, it is ensured that seawater will not enter when the exhaust hole 18 is venting, and when the piston moves away from the exhaust hole 18, the negative pressure generated by the exhaust chamber 8 will not suck seawater into the exhaust chamber 8. The one-way valve structure is a prior art and will not be elaborated on here.

[0068] An offshore wind power device includes the offshore wind power monopile foundation based on cemented riprap provided above.

[0069] When the present invention is used, when the waves hit the blades 16, the blades 16 will drive the pressure column 15 to rotate, and the pressure column 15 is coaxially fixed with the connecting column 14, driving the connecting column 14 to rotate, and the axis of the connecting column 14 coincides with the midpoint of the slot plate 13, so when the connecting column 14 rotates, the slot plate 13 rotates at the same time, and one end of the several connecting rods 11 is rotatably mounted on one end of the slot plate 13. Therefore, when the slot plate 13 rotates, the slot plate 13 and the several connecting rods 11 are rotatably mounted on one end, which will drive the several connecting rods 11 to rotate with the axis of the connecting column 14 as the center and the one end of the slot plate 13 and the several connecting rods 11 being rotatably mounted as the radius, thereby driving the several connecting rods 11 to swing, and the other ends of the several connecting rods 11 are hinged to the corresponding pistons 10, and the pistons 10 are slidably connected to the exhaust chamber 8, thereby driving the pistons 10 to reciprocate in the exhaust chamber 8, compressing the gas in the exhaust chamber 8 and discharging it into the gravel soil layer through the exhaust hole 18, thereby generating bubbles;

[0070] After being buffered by the protective component, the waves enter the spoiler component and impact the paddle 4. Since the paddle 4 is a curved rectangular structure, the bending direction of several paddles 4 is clockwise. Under the impact of the waves, the rotating ring 3 will be driven to rotate, guiding the formation of a spiral water flow.

[0071] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. The offshore wind power monopile foundation based on cemented riprap is characterized by: include: A pile foundation, a protective sleeve sleeved outside the pile foundation, a spoiler assembly mounted on the protective sleeve, and a protective assembly located around the protective sleeve; The spoiler assembly includes: a rotating ring, and a plurality of paddles mounted on the rotating ring; the rotating ring is rotatably mounted on the outer side of the protective sleeve and is rotatably connected thereto; the plurality of paddles are evenly radially arranged along the outer circumference of the rotating ring, and the paddles are curved rectangular structures, and the top of each paddle has a preset inclination angle, with the inclination direction being in the direction of the curved path of the paddle; The protective assembly includes: a support ring, a plurality of support rods arranged on the outer periphery of the support ring, and a plurality of drainage parts arranged on the support rods; the support ring is sleeved on the outer periphery of the pile foundation and fixedly connected thereto, and the plurality of drainage parts are evenly distributed along the extension direction of the support rods, and the drainage parts induce the discharge of pore water in the gravel soil layer.

2. The offshore wind power monopile foundation based on cemented riprap according to claim 1, characterized in that: The top of the paddle is inclined at an angle of 45° to 60° to the horizontal plane.

3. The offshore wind power monopile foundation based on cemented riprap according to claim 1, characterized in that: The drainage member includes: a fixed column, a plurality of exhaust pipe groups installed on the fixed column, and an exhaust unit for controlling the exhaust pipe groups to exhaust; the fixed column is a cavity structure; The exhaust pipe group includes a plurality of exhaust cavities, and the plurality of exhaust cavities surround the outer periphery of the fixed column. The plurality of exhaust pipe groups are evenly distributed along the extension direction of the fixed column, and adjacent exhaust pipe groups are alternately distributed; An exhaust hole is provided on a side of the exhaust cavity away from the fixing column; The exhaust part includes: a plurality of drive units; each of the drive units corresponds to one exhaust pipe group.

4. The offshore wind power monopile foundation based on cemented riprap according to claim 3, characterized in that: The driving unit includes: a plurality of pistons and a plurality of connecting rods; one end of the connecting rod is hinged to the piston, and the other end is hinged to the other connecting rods through a rotating column, both ends of the rotating column pass through the plurality of connecting rods, and both ends of the connecting rod are fixedly mounted with a slot plate, and the connecting rod is fixed to one end of the slot plate; A connecting column is provided between adjacent drive units, and the connecting column is fixedly connected to the slot plate of the adjacent drive unit. The drive unit located at the bottom of the fixed column is rotatably connected to the fixed column through the connecting column. The connecting column on the drive unit located at the top of the fixed column passes through the fixed column. A driving part is provided on the connecting column located outside the fixed column, which is used to receive the impact force of the waves to control the operation of the drive unit.

5. The offshore wind power monopile foundation based on cemented riprap according to claim 4, characterized in that: The slot plate is in a slot shape, and the midpoint of the slot plate is located at the axis position of the fixing column, and the connecting column is coaxially arranged with the fixing column.

6. The offshore wind power monopile foundation based on cemented riprap according to claim 4, characterized in that: The driving part includes: a pressure column and a plurality of blades mounted on the pressure column; the pressure column is coaxially fixed with the connecting column, the plurality of blades are evenly radially arranged along the periphery of the pressure column, and the blades are a curved rectangular structure.

7. The offshore wind power monopile foundation based on cemented riprap according to claim 1, characterized in that: A plurality of connecting rings are provided on the support rods, the connecting rings are coaxial with the protective sleeves, and the connecting rings are nested in each other and fixed to the support rods.

8. The offshore wind power monopile foundation based on cemented riprap according to claim 1, characterized in that: A protective net structure is formed between the plurality of support rods and the plurality of connecting rings.

9. The offshore wind power monopile foundation based on cemented riprap according to claim 3, characterized in that: A one-way valve structure is provided at the position of the exhaust hole.

10. An offshore wind power device, characterized in that: The offshore wind power device comprises the offshore wind power monopile foundation based on cemented riprap according to any one of claims 1 to 9.

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