Pile foundation scouring prevention device based on bionic spiral structure and construction method

Abstract

The present application relates to a kind of pile foundation based on the erosion prevention device of bionic helical structure and construction method, pile foundation erosion prevention device, including pile basic body, the bottom end part of the pile basic body is buried in seabed, the base of the device is installed at the junction of seabed surface and pile foundation, several limiting support rods are installed around the pile basic body, and several limiting support rods are all laid perpendicular to base;Fixed sleeve is installed at the position of the bottom end of the pile basic body, and the top end of several limiting support rods is tightly clamped by fixed sleeve;With each limiting support rod as reference, one spiral rod is matched and set, the top end of the spiral rod is fixed with fixed sleeve, and several spiral rods are arranged in the form of circumference along the outside of the pile basic body to form a hollow cylindrical structure with the pile basic body as central axis, which expands outward in the middle;The present application aims to change the flow path and speed of water flow, thereby reducing the direct impact force of water flow on pile and the erosion effect on seabed sediment, not only the effect of erosion prevention is good, but also easy to install.

Description

TECHNICAL FIELD

[0001] The present application relates to a pile scouring prevention device based on a biomimetic spiral structure and a construction method, belonging to the technical field of offshore wind turbine pile protection. BACKGROUND

[0002] Offshore wind power has become a key development area in the new energy power industry due to its proximity to power load, stable power generation, and non-occupation of land resources. However, with the rapid growth of offshore wind power grid-connected installed capacity, it also faces many challenges in engineering. Among them, the stability and reliability of offshore wind power foundation are particularly important for the long-term safe and stable operation of the wind farm and the guarantee of economic benefits.

[0003] The interaction between waves and tidal currents increases the stress on the surface of the pile and the surrounding seabed surface. Over time, the seabed surface is eroded under the influence of wave and current loads, and the scouring range gradually expands, leading to a decrease in the carrying capacity of the pile foundation and the seabed. In severe cases, scouring can cause the instability of the pile foundation, thereby threatening the safety of the entire project.

[0004] In the prior art, designs for improving the scouring resistance of pile foundations have been made, such as the invention disclosed in application number 202011130543.7, which discloses an automatic installation scouring prevention device for offshore wind power. The device includes a wind power foundation, a biomimetic grass support assembly fitted to the lower part of the wind power foundation, and the biomimetic grass support assembly includes a flexible support layer, biomimetic grass, a floating ring, and a support pipe. An electric rope reel is installed on the upper part of the wind power foundation, and the electric rope reel is connected to the corresponding support pipe through a lifting rope. The electric rope reel can drive the biomimetic grass support assembly to fold or unfold through the lifting rope. This patent connects the biomimetic grass through the support assembly, and over time, the biomimetic grass will be slowly eroded by seawater and eventually disappear. When the biomimetic grass is almost eroded by seawater, maintenance personnel need to dive to the seabed to replace the waterproof grass. Therefore, the maintenance and replacement of the scouring prevention device are still relatively cumbersome, resulting in increased maintenance and replacement costs.

[0005] To solve the problems of cumbersome maintenance and replacement and increased costs, the invention disclosed in application number 202311506787.4 discloses an automatic installation scouring prevention device for offshore wind power. The device includes a wind power bearing column, a support member adapted to connect the biomimetic grass on the side of the wind power bearing column, and a fixing unit, a clamping unit, an adjusting unit, an up-down moving unit, and a rotating unit. The fixing unit is adapted to the wind power bearing column and connected to the upper part of the support member. The clamping unit includes a first bearing frame and a second bearing frame adapted to the wind power bearing column, and the lower part of the clamping unit is clamped with the fixing unit.

[0006] However, although it facilitates the automatic installation, replacement and maintenance of the scour protection device of the wind power bearing column, the service life of the scour protection device is inevitably seriously affected due to the continuous impact of sea waves and the erosion of silt on the pile foundation installed on the seabed.

[0007] Therefore, in order to improve the scour protection performance of the pile foundation and prolong the service life of the pile foundation, a new pile foundation scour protection is needed to solve the above problems. SUMMARY

[0008] The present application provides a pile foundation scour protection device based on a bionic spiral structure and a construction method, aiming to change the flow path and speed of the water flow, thereby reducing the direct impact force of the water flow on the pile foundation and the erosion effect on the seabed silt, not only having good scour protection effect, but also being easy to install.

[0009] The technical solution adopted by the present application to solve the technical problems is:

[0010] A pile foundation scour protection device based on a bionic spiral structure, comprising a pile body, the pile body is embedded in the seabed, a base is arranged at the interface between the seabed and the pile body, a plurality of limiting support rods are installed around the pile body, and the plurality of limiting support rods are perpendicular to the base; a fixing sleeve is installed at the position close to the bottom end of the pile body, and the fixing sleeve tightly clamps the top end of the plurality of limiting support rods;

[0011] Taking each limiting support rod as a reference, one spiral rod is matched and arranged, the top end of the spiral rod is fixed with the fixing sleeve, and the plurality of spiral rods are arranged in a circular form along the outside of the pile body to form a hollow cylindrical structure with the pile body as the central axis and expanding outward in the middle;

[0012] The spiral rod is in a spiral shape, each spiral rod is connected smoothly by a plurality of cross sections, the plurality of cross sections are numbered as 1, 2, …, 9 from the base to the fixing sleeve, the hollow cylindrical structure guide line penetrates the center of the cross sections numbered 1-9, and the plane where the cross sections numbered 1-9 are located is perpendicular to the hollow cylindrical structure guide line at the corresponding center;

[0013] Taking the central axis of the limiting support rod as the 0° line, the cross section numbered 1 is located at a position 262.68° counterclockwise from the 0° line and 28.71 units away from the center of the pile body, and the radius is 3 units;

[0014] The cross section numbered 2 is located at a position 69.25° clockwise from the 0° line and 43.36 units away from the center of the pile body, and the radius is 4 units;

[0015] The cross section circle numbered 3 is located at a position of 298.21° counterclockwise rotation from the 0° line, 48.27 units away from the center of the pile basic body, with a radius of 5 units;

[0016] The cross section circle numbered 4 is located at a position of 46.14° clockwise rotation from the 0° line, 57.57 units away from the center of the pile basic body, with a radius of 5 units;

[0017] The cross section circle numbered 5 is located at a position of 22.67° clockwise rotation from the 0° line, 62.61 units away from the center of the pile basic body, with a radius of 5 units;

[0018] The cross section circle numbered 6 is located at a position of 4.57° clockwise rotation from the 0° line, 54.40 units away from the center of the pile basic body, with a radius of 5 units;

[0019] The cross section circle numbered 7 is located at a position of 8.12° counterclockwise rotation from the 0° line, 43.36 units away from the center of the pile basic body, with a radius of 5 units;

[0020] The cross section circle numbered 8 is located at a position of 2.33° clockwise rotation from the 0° line, 36.47 units away from the center of the pile basic body, with a radius of 3 units;

[0021] The cross section circle numbered 9 is located at a position of 0° line, 28.71 units away from the center of the pile basic body, with a radius of 3 units;

[0022] Further, taking the bottom surface of the base as the reference surface, the vertical direction of the base is set as the height direction, the cross section circle numbered 1 is 0 units away from the reference surface, the cross section circle numbered 2 is 34.54 units away from the reference surface, the cross section circle numbered 3 is 40.68 units away from the reference surface, the cross section circle numbered 4 is 53.52 units away from the reference surface, the cross section circle numbered 5 is 76.81 units away from the reference surface, the cross section circle numbered 6 is 100.42 units away from the reference surface, the cross section circle numbered 7 is 116.99 units away from the reference surface, the cross section circle numbered 8 is 134.47 units away from the reference surface, and the cross section circle numbered 9 is 163.54 units away from the reference surface;

[0023] Further, twenty of the spiral rods are uniformly distributed at intervals of 18° along the outer circumference of the pile basic body;

[0024] Further, the base is disc-shaped in structure, the surface of which is tightly attached to the pile basic body and is fixedly connected through a plurality of fixing bolts;

[0025] Further, a plurality of mounting holes are evenly formed on the fixing sleeve along the circumference, and the distribution distance of the mounting holes matches the distribution distance of the spiral rods, and the top ends of the spiral rods are inserted into the mounting holes;

[0026] According to the construction method of any one of the pile foundation scour prevention devices based on the bionic spiral structure, the following steps are included:

[0027] In step S1, before construction, seabed detection equipment is used to survey the construction area to determine the installation position of the base;

[0028] In step S2, the soil condition of the installation position is detected and evaluated, and if the seabed soil is soft or uneven, the local area is leveled, and a concrete plate is laid around the base after installation;

[0029] In step S3, after the base is installed stably, limit support rods are sequentially installed according to the design requirements, and are vertically and evenly distributed around the pile foundation body with the pile foundation body as the central axis, and the bottom ends of the limit support rods are fixed on the base through the clamping grooves to form a support frame;

[0030] In step S4, the fixing sleeve is sleeved and installed on the pile foundation body, and the top of the limit support rod is clamped tightly;

[0031] In step S5, according to the water flow direction and intensity, the number of spiral rods is selected, and the installation position of the spiral rods is determined, and the top ends of the spiral rods are sequentially inserted into the mounting holes of the fixing sleeve, and the bottom ends of the spiral rods are fixed on the base through the clamping grooves;

[0032] In step S6, after installation is completed, the connection part is checked, and the detection equipment is used to measure the verticality and horizontality of the installed structure, and the installation work is completed.

[0033] Through the above technical scheme, compared with the prior art, the present application has the following beneficial effects:

[0034] 1. The pile foundation scour prevention device based on the bionic spiral structure provided by the present application is inspired by the design of the spiral shape of a shell, has a streamlined outer surface, can effectively change the water flow direction and reduce the turbulent kinetic energy, so that the force of the water flow on the pile foundation body is significantly reduced, avoiding direct impact of the water flow on the pile foundation body, thereby reducing the wear and damage to the pile foundation body;

[0035] 2. The pile foundation scour prevention device based on the bionic spiral structure provided by the present application can flexibly adjust the number and distribution position of the spiral rods according to the actual water flow direction and intensity to achieve the best scour prevention effect;

[0036] 3、The pile foundation scouring prevention device based on the bionic spiral structure provided by the application is also designed with a limiting support structure, which plays a role in stabilizing and supporting the spiral rod, further reduces vibration and displacement of the device when the water flow impacts, ensures that the spiral rod will not be offset or deformed due to the impact of strong flow, thereby improving the overall stability of the system and prolonging the service life of the scouring structure. BRIEF DESCRIPTION OF DRAWINGS

[0037] The application will be further described below in combination with the drawings and examples.

[0038] Figure 1 is a front view of the pile foundation scouring prevention device based on the bionic spiral structure according to the preferred embodiment provided by the application;

[0039] Figure 2 is a top enlarged view of the pile foundation scouring prevention device based on the bionic spiral structure according to the preferred embodiment provided by the application;

[0040] Figure 3 is a cross-sectional circular arrangement view of a single spiral rod according to the preferred embodiment provided by the application;

[0041] Figure 4 is a spiral rod space structure guide line penetration cross-sectional circular view according to the preferred embodiment provided by the application;

[0042] Figure 5 is a spiral rod cross-sectional circular relative base height distance view according to the preferred embodiment provided by the application.

[0043] In the figure: 1 is a pile base body, 2 is a fixing sleeve, 3 is a base, 4 is a limiting support rod, 5 is a spiral rod, and 6 is a mounting hole. DETAILED DESCRIPTION

[0044] The application will be further described below in combination with the drawings and examples. 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 used for the convenience of describing the present 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 present application. The specific dimensions used in the present embodiment are only used to illustrate the technical solutions and do not limit the protection scope of the present application.

[0045] As set forth in the background, the prior art provides a good idea for wind power pile foundation scour prevention, but still has defects such as poor economic benefit, complicated installation, complex device, difficult maintenance, limited scour prevention effect, etc. In order to solve the above defects related to the protection measures, the present application provides a pile foundation scour prevention device based on bionic spiral structure, which is based on the natural structure of shell spiral form, and is designed by imitating the spiral form of shell, aiming to change the flow path and speed of water flow, thereby reducing the direct impact force of water flow on the pile and the erosion effect on the bed surface sediment.

[0046] As Figure 1 shown, it is the overall structure of the pile foundation scour prevention device, including a pile basic body 1, the main body part of the pile basic body is buried into the seabed, a base 3 is arranged at the interface between the seabed surface and the pile basic body, a plurality of limiting support rods 4 are installed around the pile basic body, and the plurality of limiting support rods are arranged perpendicularly to the base. The base is a disc-shaped structure, the surface of which is closely combined with the pile basic body and is fixedly connected by a plurality of fixing bolts. The design of the base considers the protection of seabed sediment, and the close contact of the gravity type structure with the seabed ensures the stability of the device in long-term work, avoiding the instability or displacement of the device caused by scour. A fixing sleeve 2 is sleeved and installed at the position close to the bottom end of the pile basic body, and the fixing sleeve tightly clamps the top end of the plurality of limiting support rods.

[0047] The limiting support rod, as the name implies, has two functions of "limiting" and "supporting". Regarding "limiting", one spiral rod 5 is matched and arranged perpendicularly to each limiting support rod, and the top end of the spiral rod is fixedly connected with the fixing sleeve. After the plurality of spiral rods are arranged in a circumferential form along the outer part of the pile basic body, a hollow cylindrical structure is formed, which has the pile basic body as the central axis and expands outward in the middle.

[0048] The hollow cylindrical structure described herein is a spiral structure. When seawater impacts the pile basic body, the streamlined design of the spiral rod separates and guides the water flow to the downstream, forming a rotating flow. This rotating effect not only prolongs the flow path of the water flow, but also effectively reduces the speed and turbulent kinetic energy of the water flow. Unlike the principle of strengthening the stability of the pile basic body itself in the current prior art, the present application reduces the impact force of the water flow from the source.

[0049] As "supporting", the base is located at the interface between the pile basic body and the seabed surface, the limiting support rod is connected with the pile basic body through a plurality of fixing bolts, and the fixing sleeve is installed at the top of the spiral rod, which is used to stably connect the scour prevention device to the pile, and maintains the stability and firmness of the installation of the spiral rod. The device plays a supporting role, ensuring its reliability in complex marine environment, and also plays a protective role for the pile basic body when facing wave impact.

[0050] In order to ensure the stability of the installation of the screw rod, preferably, Figure 2 As shown, a plurality of installation holes 6 are evenly arranged on the fixing sleeve along the circumference, the distribution distance of the installation holes matches the distribution distance of the screw rods, and the top end of the screw rod is inserted into the installation hole. Assuming that the installation holes are numbered 1-20 respectively, when the number of screw rods is 20, they are inserted into holes 1-20, and when the number of screw rods is 10, they are inserted into holes 1, 3, 5, 7, 9, 11, 13, 15, 17, and 19.

[0051] Through the foregoing description, the most important innovation of the present application is that the hollow cylindrical structure is composed of a plurality of screw rods. This structure forms a buffer space between the screw rod and the pile basic body, and the limiting support rod is placed in the buffer space. In order to make the limiting support rod provide support and limiting for the screw rod and achieve the optimal effect of reducing the direct impact of water flow on the pile basic body, the present application preferably provides a specific shape structure of the screw rod.

[0052] As shown in the figure, Figure 3 The screw rod is in a spiral shape, each screw rod is connected smoothly by a plurality of cross-section circles, in order to facilitate description, the plurality of cross-section circles are numbered from the base to the fixing sleeve direction, which are 1, 2, …, 9 respectively, the hollow cylindrical structure guide line penetrates the center of the cross-section circles numbered 1-9, and the plane where the cross-section circles numbered 1-9 are located is perpendicular to the hollow cylindrical structure guide line at the corresponding center.

[0053] Figure 4As shown, the middle axis of the limiting support rod is 0° line, the cross section circle numbered 1 is located at the position of 262.68° counterclockwise rotation from the 0° line, 28.71 units away from the center of the pile basic body, with a radius of 3 units; the cross section circle numbered 2 is located at the position of 69.25° clockwise rotation from the 0° line, 43.36 units away from the center of the pile basic body, with a radius of 4 units; the cross section circle numbered 3 is located at the position of 298.21° counterclockwise rotation from the 0° line, 48.27 units away from the center of the pile basic body, with a radius of 5 units; the cross section circle numbered 4 is located at the position of 46.14° clockwise rotation from the 0° line, 57.57 units away from the center of the pile basic body, with a radius of 5 units; the cross section circle numbered 5 is located at the position of 22.67° clockwise rotation from the 0° line, 62.61 units away from the center of the pile basic body, with a radius of 5 units; the cross section circle numbered 6 is located at the position of 4.57° clockwise rotation from the 0° line, 54.40 units away from the center of the pile basic body, with a radius of 5 units; the cross section circle numbered 7 is located at the position of 8.12° counterclockwise rotation from the 0° line, 43.36 units away from the center of the pile basic body, with a radius of 5 units; the cross section circle numbered 8 is located at the position of 2.33° clockwise rotation from the 0° line, 36.47 units away from the center of the pile basic body, with a radius of 3 units; the cross section circle numbered 9 is located on the 0° line, 28.71 units away from the center of the pile basic body, with a radius of 3 units.

[0054] Similarly, the overall height of the pile foundation scour prevention device is customized according to the height of the pile basic body and the water depth, so as to ensure that the spiral rod covers the key stress area of the pile basic body and enhances the scour prevention effect. Figure 5 As shown, the bottom surface of the base is the reference surface, and the height distance in the vertical direction of the base also has a limit. The cross section circle numbered 1 is 0 units away from the reference surface, the cross section circle numbered 2 is 34.54 units away from the reference surface, the cross section circle numbered 3 is 40.68 units away from the reference surface, the cross section circle numbered 4 is 53.52 units away from the reference surface, the cross section circle numbered 5 is 76.81 units away from the reference surface, the cross section circle numbered 6 is 100.42 units away from the reference surface, the cross section circle numbered 7 is 116.99 units away from the reference surface, the cross section circle numbered 8 is 134.47 units away from the reference surface, and the cross section circle numbered 9 is 163.54 units away from the reference surface.

[0055] When the upstream seawater flows to the device, the water flow is separated and guided by the spiral rod, causing the flow rate to slow down, the flow direction to change, and the turbulent kinetic energy to decrease, so that the water flow no longer directly impacts the pile base, and the water flow will spread downstream around the streamlined spiral rod without directly impacting the seabed, effectively controlling the scour of the seabed by stress, and achieving protection against scour of the pile base and the seabed.

[0056] It should be particularly noted that the casting of the spiral rod adopts a sectional casting process, uses high-strength corrosion-resistant alloy materials, and ensures the consistency of the shape, size and curve of each spiral unit through a precisely designed single mold. Molten metal is formed through a vacuum casting process, followed by sand cleaning, three-dimensional laser polishing and heat treatment to improve the surface finish and mechanical properties. Finally, non-destructive testing is used to ensure the quality of the casting, and a corrosion-resistant coating is applied to ensure the long-term scouring performance and stability of the spiral rod in the marine environment.

[0057] When the shape of the spiral rod is determined, in actual application, the pile base is subjected to scouring force in all directions, and the scouring force on the pile base is strongest in the main direction of the water flow. According to the actual water flow direction and intensity, the number and distribution position of the spiral rods can be flexibly adjusted to achieve the best anti-scouring effect.

[0058] Suppose the exposed pile originally bears an impact force of 500-800kN / m 2 , and it is desired to reduce it by 30%-50% to 250-400kN / m 2 . According to the kinetic energy formula E = 1 / 2mv 2 and the momentum equation F = Δ(mv) / Δt, the design with a significant advantage in hydrodynamic engineering is to set 20 spiral rods, which are evenly distributed along the outer circumference of the pile base at an interval of 18°. When the water flow passes through the spiral rod, the spiral rod changes the water flow path, generates vortexes and disperses the impact, part of the kinetic energy is converted into vortexes and dissipated, reducing the local flow rate; at the same time, the water flow loses more energy during multiple flow processes, avoiding the formation of a fluid concentration area, effectively reducing the impact force of the water flow on the structure and reducing the risk of scouring.

[0059] Compared with a small number of rods, 20 helical rods can more evenly disperse the water flow and avoid impact concentration caused by excessively large gaps. If the number of helical rods is greater than 20, the fluid resistance will significantly increase, increasing the frictional resistance and unevenly strengthening the stress distribution. Secondly, the cost of manufacturing and installing more than 20 rods will significantly increase, increasing the overall construction cost, the maintenance workload, and the durability of the device due to excessive installation holes and the excessive overall weight of the helical rods. In addition, too many helical rods can weaken the flow vortex effect, affect the weakening effect of the impact force, and even cause mutual interference between the helical rods, forming an area of poor flow and increasing the design complexity. Therefore, the design of 20 helical rods provides a moderate redundancy in structural stability, so that even if part of the helical rods are damaged, the overall protection performance will not be affected, further enhancing the long-term durability of the structure.

[0060] The above pile scouring prevention device based on the bionic helical structure is designed in a modular manner, and all components are assembled through a standardized connection method, which is convenient to install and disassemble and is suitable for large-scale application. Through the preformed installation holes and the clamping groove structure, the connection between the helical rod and the fixing sleeve is simpler and more stable. During construction, the base only needs to be fixed on the pile foundation body, and then the helical rods are installed one by one, greatly reducing the installation time and cost. The entire device surface is subjected to corrosion protection treatment to ensure its long-term stability and durability in seawater or freshwater environments.

[0061] Finally, the application also provides a construction method for the pile scouring prevention device based on the bionic helical structure, which includes the following steps:

[0062] Step S1, before construction, a seabed detection device is used to survey the construction area and determine the installation position of the base. After positioning is completed, the base can be transported to the designated position by a ship.

[0063] Step S2, the soil condition at the installation position is detected and evaluated. If the seabed soil is soft or uneven, local leveling is performed. After the base is installed, concrete plates are laid around it, and concrete pouring can be completed by underwater grouting equipment to enhance the stability and anti-skid ability of the base. The design of the base needs to be in close contact with the seabed surface to maximize the stability of the device.

[0064] Step S3, after the base is installed stably, limit support rods are sequentially installed according to the design requirements. The limit support rods are installed vertically and evenly around the pile foundation body with the pile foundation body as the central axis. The bottom end of the limit support rod is fixed on the base through the clamping groove to form a support frame.

[0065] Step S4, the fixing sleeve is sleeved and installed on the pile foundation body, and the top of the limit support rod is clamped tightly.

[0066] Step S5, according to the water flow direction, water flow intensity live, select the number of spiral rods, determine the installation position of the spiral rods, insert the top end of the spiral rods into the mounting hole of the fixed sleeve in sequence, and fix the bottom end of the spiral rods on the base through the clamping groove;

[0067] Step S6, after installation, check the connection part, and use the detection equipment to measure the verticality and horizontality of the installed structure to ensure that it meets the design standard. After the inspection is completed, it can enter the working state and continuously protect the pile basic body and seabed from erosion.

[0068] Of course, after the device starts working, professional divers or underwater robots need to be dispatched regularly for inspection, focusing on checking the connection and fastening of the spiral rods and the fixed sleeve, as well as the stability of the limiting support rod. According to the changes of sea conditions, timely replacement or reinforcement of the device can be carried out.

[0069] In order to further improve the operation efficiency of the device, a monitoring system can be installed on the anti-erosion device. The system consists of water flow monitoring sensors and stress monitoring devices installed on the device. The sensor can monitor the water flow speed, the stress state of the device and the structure health in real time, and transmit the data to the shore control center. The introduction of the monitoring system can timely discover potential risks such as device loosening or abnormal water flow, and facilitate timely adjustment or maintenance.

[0070] Those skilled in the art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood as having meanings consistent with those in the prior art, and should not be interpreted with idealized or overly formal meanings unless defined as such.

[0071] The meaning of "and / or" described in the present application means that each single existence or both existences are included.

[0072] The meaning of "connection" described in the present application can be direct connection between components or indirect connection between components through other components.

[0073] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel 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 contents in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A pile foundation anti-scour device based on a bionic spiral structure, comprising a pile base body, characterized in that: The main part of the pile foundation of the pile basic body is buried in the seabed, a base is arranged at the interface between the seabed surface and the pile foundation main body, and a plurality of limit support rods are installed around the pile basic body, and the plurality of limit support rods are arranged perpendicular to the base; a fixing sleeve is installed near the bottom end of the pile basic body, and the fixing sleeve tightens the top ends of the plurality of limit support rods; A spiral rod is matched with each limit support rod, and the top of the spiral rod is fixed to the fixed sleeve. Several spiral rods are arranged in a circular form along the outside of the pile basic body to form a hollow cylindrical structure with the pile basic body as the central axis and the middle expanding outward; The spiral rod is in a spiral shape, and each spiral rod is formed by smoothly connecting a plurality of cross-sectional circles. The plurality of cross-sectional circles are numbered 1, 2, ..., 9 from the base to the fixed sleeve. The hollow cylindrical construction guide line penetrates the center of the cross-sectional circles numbered 1-9, and the planes on which the cross-sectional circles numbered 1-9 lie are perpendicular to the hollow cylindrical construction guide line at the corresponding centers. With the center axis of the limiting support rod as the 0° line, the cross-sectional circle numbered 1 is located 262.68° counterclockwise from the 0° line and 28.71 units away from the center of the pile basic body, with a radius of 3 units; The cross-sectional circle numbered 2 is located 69.25° clockwise from the 0° line and 43.36 units away from the center of the pile body, with a radius of 4 units; The cross-sectional circle numbered 3 is located 298.21° counterclockwise from the 0° line and 48.27 units away from the center of the pile body, with a radius of 5 units; The cross-sectional circle numbered 4 is located 46.14° clockwise from the 0° line and 57.57 units away from the center of the pile body, with a radius of 5 units; The cross-sectional circle numbered 5 is located 22.67° clockwise from the 0° line and 62.61 units away from the center of the pile body, with a radius of 5 units; The cross-sectional circle numbered 6 is located 4.57° clockwise from the 0° line and 54.40 units away from the center of the pile body, with a radius of 5 units; The cross-sectional circle numbered 7 is located 8.12° counterclockwise from the 0° line and 43.36 units away from the center of the pile body, with a radius of 5 units; The cross-sectional circle numbered 8 is located 2.33° clockwise from the 0° line and 36.47 units away from the center of the pile body, with a radius of 3 units; The cross-sectional circle numbered 9 is located on the 0° line, 28.71 units away from the center of the pile basic body, and has a radius of 3 units.

2. The pile foundation anti-scour device based on the bionic spiral structure according to claim 1 is characterized by: Taking the bottom surface of the base as the reference plane and setting the direction perpendicular to the base as the height direction, the section circle numbered 1 is 0 units away from the reference plane, the section circle numbered 2 is 34.54 units away from the reference plane, the section circle numbered 3 is 40.68 units away from the reference plane, the section circle numbered 4 is 53.52 units away from the reference plane, the section circle numbered 5 is 76.81 units away from the reference plane, the section circle numbered 6 is 100.42 units away from the reference plane, the section circle numbered 7 is 116.99 units away from the reference plane, the section circle numbered 8 is 134.47 units away from the reference plane, and the section circle numbered 9 is 163.54 units away from the reference plane.

3. The pile foundation anti-scour device based on a bionic spiral structure according to claim 1 is characterized in that: A total of twenty spiral rods are provided, which are evenly distributed at intervals of 18° along the outer circumference of the pile basic body.

4. The pile foundation anti-scour device based on a bionic spiral structure according to claim 1 is characterized by: The base is a disc-shaped structure, the surface of which is tightly fitted with the pile base body and is fixedly connected by a plurality of fixing bolts.

5. The pile foundation anti-scour device based on a bionic spiral structure according to claim 1 is characterized in that: A plurality of mounting holes are evenly opened along the circumference of the fixing sleeve, the distribution distance of the mounting holes matches the distribution distance of the spiral rods, and the top ends of the spiral rods are inserted into the mounting holes.

6. The construction method of the pile foundation anti-scour device based on the bionic spiral structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1: Before construction, the construction area is surveyed and mapped using seabed detection equipment to determine the installation location of the base; Step S2: Inspect and evaluate the soil conditions at the installation location. If the seabed soil is soft or uneven, level the area. After the base is installed, lay a concrete slab around it. Step S3: After the base is firmly installed, the limit support rods are installed in sequence according to the design requirements. The limit support rods are evenly distributed vertically around the pile body as the central axis. The bottom ends of the limit support rods are fixed to the base through slots to form a support frame. Step S4: Install the fixing sleeve on the pile base and tighten the top of the limit support rod; Step S5: According to the water flow direction and water flow intensity, the number of screw rods is selected and the installation positions of the screw rods are determined. The top ends of the screw rods are sequentially inserted into the installation holes of the fixing sleeves, and the bottom ends of the screw rods are fixed to the base through the slots. Step S6: After the installation is completed, the connection part is inspected and the verticality and horizontality of the installed structure are measured using detection equipment to complete the installation work.

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