Offshore wind power rigidity self-adaptive screw pile and construction method thereof

Abstract

The invention provides an offshore wind power rigidity self-adaptive screw pile and a construction method thereof. An offshore wind power rigidity self-adaptive screw pile comprises a screw pile body assembly which comprises an equal-diameter steel pipe, a first screw blade and a second screw blade, and the first screw blade and the second screw blade are fixedly arranged on the outer wall of the equal-diameter steel pipe; the hydraulic chambers are arranged in the first spiral blade and / or the second spiral blade; the hydraulic system communicates with the multiple hydraulic cavities and is used for adjusting hydraulic pressure in the multiple hydraulic cavities; the monitoring control system comprises a control system and at least one stress sensor, the stress sensors are arranged on the screw pile body assembly and used for monitoring internal force information of the screw pile body assembly, and the control system is electrically connected with the stress sensors and the hydraulic system. The control system is configured to control the hydraulic system to adjust the hydraulic pressure in the multiple hydraulic cavities according to the internal force information monitored by the stress sensors. The self-rigidity can be adjusted according to the actual stress state, and the bearing capacity and stability are improved.

Description

Technical Field

[0001] The present invention relates to an offshore wind power pile foundation and a construction method thereof, in particular to an offshore wind power stiffness adaptive spiral pile and a construction method thereof, belonging to the technical field of building pile foundation engineering. Background Art

[0002] Driven by the growing global demand for clean energy, the offshore wind power industry is developing rapidly. Screw piles, with their advantages of ease of construction and minimal environmental impact, have become a common form of offshore wind turbine foundation. However, the marine environment in which offshore wind power operates is extremely harsh and complex. The weight of the wind turbine tower and its ancillary equipment generates axial pressure, while wind, waves, and currents exert strong lateral shear forces on the screw piles. Furthermore, the torsional torque generated by the continuous rotation of the wind turbine blades is transmitted to the pile shaft.

[0003] Under the combined effect of these coupled loads, the disadvantages of traditional screw piles have gradually become apparent. Traditional screw piles in the existing technology usually adopt a design of a pile body with a uniform cross-section and fixed-pitch blades. This structure leads to a solidified stiffness distribution. When the pile body is subjected to complex coupled loads, stress concentration is easily generated, especially at the connection between the spiral blades and the pile body, which greatly shortens the fatigue life of this area and becomes the main source of structural damage. In addition, marine strata often present the complex characteristics of soft and hard interlayers. The fixed stiffness of traditional screw piles is difficult to adapt to different geological conditions, which may lead to excessive settlement in soft soil layers, difficulty in sinking piles in hard soil layers, and even damage to the pile body. The axial, lateral and torsional stiffness of existing screw piles are in a fixed proportional relationship and cannot be dynamically adjusted according to real-time changing load conditions. This may cause drastic fluctuations in the pile-soil contact pressure and accelerate the softening of the soil around the pile. These problems not only increase engineering risks, but also lead to higher maintenance costs throughout the life cycle.

[0004] Therefore, there is an urgent need to develop a new type of screw pile that can adapt to complex loads and geological conditions to ensure the safe and stable operation of offshore wind power facilities and promote the sustainable development of the offshore wind power industry. Summary of the Invention

[0005] Based on the above background, the purpose of the present invention is to provide an offshore wind power stiffness adaptive screw pile and a construction method thereof, which can adjust its own stiffness according to the actual stress state, optimize stress distribution, and improve bearing capacity and stability.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] An offshore wind power stiffness adaptive spiral pile, comprising:

[0008] A screw pile body assembly, comprising a steel pipe of equal diameter, a first spiral blade and a second spiral blade fixed to the outer wall of the steel pipe of equal diameter, wherein the first spiral blade is located at the upper part of the steel pipe of equal diameter, and the second spiral blade is located at the lower part of the steel pipe of equal diameter;

[0009] a plurality of hydraulic chambers, wherein the plurality of hydraulic chambers are arranged inside the first spiral blade and / or the second spiral blade;

[0010] a hydraulic system, the hydraulic system being in communication with the plurality of hydraulic chambers and being configured to adjust the hydraulic pressures in the plurality of hydraulic chambers;

[0011] A monitoring and control system includes a control system and at least one stress sensor, wherein the stress sensor is provided on the screw pile body assembly and is used to monitor internal force information of the screw pile body assembly. The control system is electrically connected to the stress sensor and the hydraulic system, and is configured to control the hydraulic system to adjust the hydraulic pressure in the plurality of hydraulic chambers according to the internal force information monitored by the stress sensor.

[0012] The first spiral blade mainly enhances the interaction between the pile and the shallow soil and provides horizontal bearing capacity. The second spiral blade mainly provides the screwing power during pile sinking and enhances the friction with the deep soil. By setting a hydraulic chamber inside the spiral blade and coordinating the hydraulic system and monitoring and control system, the spiral pile can actively adjust its own stiffness according to the external load and internal stress state.

[0013] Preferably, the first spiral blade and the second spiral blade are each formed by at least two layers of plate structures, and the plurality of hydraulic chambers are provided between the at least two layers of plate structures. The plate structure provides space for the hydraulic chambers and ensures the structural strength and sealing of the spiral blade itself.

[0014] Preferably, the plurality of hydraulic chambers are distributed in an annular or honeycomb shape inside the first spiral blade and / or the second spiral blade. The annular or honeycomb shape distribution helps to more evenly adjust the stiffness of the spiral blade.

[0015] Preferably, the stress sensor is arranged at the connection between the uniform diameter steel pipe and the first spiral blade and / or at the connection between the uniform diameter steel pipe and the second spiral blade. The location of the stress sensor is a stress concentration area, which can better reflect the change of the stress state of the pile body.

[0016] Preferably, the hydraulic system includes a hydraulic pipeline communicating with the hydraulic chamber, and a hydraulic pump and a hydraulic valve disposed on the hydraulic pipeline. The control system regulates the hydraulic pressure within the hydraulic chamber by controlling the operating states of the hydraulic pump and the hydraulic valve. The hydraulic pump provides a power source for injecting or withdrawing hydraulic medium from the hydraulic chamber, while the hydraulic valve controls the direction and flow rate of the hydraulic medium, thereby regulating the pressure within the hydraulic chamber.

[0017] Preferably, the hydraulic system further includes an accumulator connected to the hydraulic line, configured to store and release hydraulic energy. The accumulator can balance pressure fluctuations in the hydraulic system, store excess hydraulic oil and energy, and rapidly release it when needed to cope with sudden load changes.

[0018] Preferably, the diameter of the first spiral blade is larger than the diameter of the second spiral blade. The diameter of the first spiral blade is 2 to 3 times the diameter of the uniform diameter steel pipe, and the diameter of the second spiral blade is 1.2 to 1.5 times the diameter of the uniform diameter steel pipe. The above diameter configuration is designed based on the characteristics of soil layers at different depths and the function of the blades. The larger diameter first spiral blade is more conducive to interacting with shallow soil, providing greater horizontal resistance and partial vertical bearing capacity. The relatively smaller diameter second spiral blade is conducive to reducing torque during pile driving and mainly interacts with deep soil to provide pullout resistance and vertical bearing capacity.

[0019] Preferably, a pipeline channel for connecting the hydraulic system and the monitoring and control system is provided inside the uniform diameter steel pipe. Providing the pipeline channel inside the uniform diameter steel pipe can effectively protect the hydraulic pipeline and sensor circuit from corrosion and mechanical damage in the external marine environment.

[0020] A construction method for offshore wind power adaptive stiffness spiral piles as described above, the method comprising the following steps:

[0021] S1, prefabricating and assembling the screw pile body assembly, the hydraulic chamber, the hydraulic system, and the monitoring and control system to form the offshore wind power stiffness adaptive screw pile;

[0022] S2. transporting the assembled offshore wind power stiffness adaptive spiral pile to the target sea area and performing pile sinking operations, so that the lower portion of the offshore wind power stiffness adaptive spiral pile penetrates into the underwater soil;

[0023] S3. After the offshore wind power stiffness adaptive spiral pile is sunk into place, the monitoring and control system is started, and the stress sensor monitors the internal force information of the spiral pile body assembly in real time, and transmits the internal force information to the control system;

[0024] S4. The control system controls the hydraulic system to adjust the hydraulic pressure in the plurality of hydraulic chambers according to the received internal force information, so as to adjust the stiffness of the screw pile body assembly.

[0025] Preferably, in step S4, when the control system determines that a specific portion of the screw pile body assembly is subjected to excessive force, the control system controls the hydraulic system to inject hydraulic oil into the hydraulic chamber corresponding to the specific portion to increase the rigidity of the portion.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The offshore wind power self-adaptive stiffness spiral pile of the present invention achieves self-adaptive adjustment of the spiral pile stiffness by providing a hydraulic chamber with adjustable pressure inside the spiral blades and using a monitoring and control system to control the hydraulic system based on real-time monitoring of the internal force information of the pile body. This can effectively alleviate the local stress concentration problem of traditional spiral piles under complex loads. When subjected to axial pressure, lateral shear force and torsional moment, the various parts of the pile body can share the load more evenly, thereby improving the overall bearing capacity of the pile body.

[0028] The present invention can adjust the stiffness of the screw pile according to different geological conditions. In soft soil, the stiffness of the spiral blades can be appropriately increased to improve the stability of the pile body. In hard soil, the stiffness of the spiral blades can be appropriately reduced to reduce the resistance to pile sinking, thereby better adapting to the complex characteristics of marine strata.

[0029] The present invention alleviates the stress concentration problem and helps to slow down material fatigue damage in key parts of the pile body, thereby extending the service life of the spiral pile. The extended service life and improved structural reliability can significantly reduce the later maintenance costs and replacement risks of offshore wind power projects. 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 merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of an offshore wind power stiffness adaptive spiral pile according to the present invention;

[0032] Figure 2 It is a top view of the overall structure of the screw pile body assembly of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the first spiral blade in the present invention;

[0034] Figure 4 is a top view of the structure of the second spiral blade in the present invention;

[0035] In the figure: 1. Steel pipe of equal diameter; 2. First spiral blade; 3. Second spiral blade; 4. Hydraulic chamber; 5. Hydraulic valve; 6. Hydraulic pump; 7. Energy accumulator; 8. Stress sensor; 9. Control system. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the scope of protection of the present invention.

[0037] In the present invention, unless otherwise specified, all parts and percentages are by weight. The equipment and raw materials used are commercially available or commonly used in the art. The methods in the following embodiments, unless otherwise specified, are conventional methods in the art. The components or equipment in the following embodiments, unless otherwise specified, are all universal standard parts or components known to those skilled in the art. Their structures and principles are known to those skilled in the art through technical manuals or routine experimental methods.

[0038] The following detailed description of the embodiments of the present invention is made in conjunction with the accompanying drawings. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be implemented by those skilled in the art without these specific details.

[0039] like Figure 1-4 As shown, an embodiment of the present invention discloses an offshore wind power stiffness adaptive screw pile, comprising a screw pile body assembly, a plurality of hydraulic chambers 4, a hydraulic system and a monitoring and control system.

[0040] The screw pile body assembly includes a uniform diameter steel pipe 1, a first spiral blade 2, and a second spiral blade 3 fixed to the outer wall of the uniform diameter steel pipe 1. The uniform diameter steel pipe 1 serves as the core supporting structure of the screw pile. Its diameter is designed according to the actual needs of the project and generally ranges from 1 to 3 meters. For example, if the geological conditions in the sea area where the project is located are complex and the pile body is expected to bear a large load, a uniform diameter steel pipe with a diameter close to 3 meters can be selected; if the project is small and the geological conditions are relatively good, a steel pipe with a diameter of about 1 meter can be selected. The uniform diameter steel pipe 1 is made of low-alloy high-strength steel with a yield strength of not less than 400MPa to ensure the integrity of the structure under complex stress conditions. In order to enhance the corrosion resistance, a layer of epoxy zinc-rich primer with a thickness of 0.2 to 0.5mm is first coated on the surface of the uniform diameter steel pipe 1, and then covered with a layer of polyurethane topcoat with a thickness of 0.3 to 0.6mm. A through channel is provided inside the uniform diameter steel pipe 1 for laying hydraulic pipelines and electrical lines connecting the hydraulic system and the monitoring and control system. At the same time, an interface for connecting to the hydraulic chamber inside the spiral blade is reserved on the surface of the pile body.

[0041] The first spiral blade 2 is located at the upper part of the equal-diameter steel pipe 1, close to the seabed surface. Its main function is to enhance the interaction between the pile body and the shallow soil, providing the main horizontal bearing capacity and part of the vertical bearing capacity. The second spiral blade 3 is located at the lower part of the equal-diameter steel pipe 1, deep into the soil layer, providing the main screw-in power when sinking the pile, and enhancing the friction with the deep soil to provide pull-out bearing capacity and the main vertical bearing capacity. In this embodiment, the diameter of the first spiral blade 2 is 2 to 3 times the diameter of the equal-diameter steel pipe 1, and the diameter of the second spiral blade 3 is 1.2 to 1.5 times the diameter of the equal-diameter steel pipe 1. The first spiral blade 2 and the second spiral blade 3 are both spirally ascending, and their pitch is adjusted according to the characteristics of the stratum. For example, the pitch can be designed to be 0.5 to 1m in soft soil strata and 0.3 to 0.5m in hard soil strata. The first and second spiral blades 2 and 3 are welded from two layers of high-strength, wear-resistant steel plates, 15 to 30 mm thick and with a hardness of HB350550, to withstand wear during pile driving and use. The space between the two layers of steel plates is used to house multiple hydraulic chambers 4.

[0042] Multiple hydraulic chambers 4 are located within the first spiral blade 2 and / or the second spiral blade 3. In this embodiment, the hydraulic chambers 4 are made of high-strength aluminum alloy, with a wall thickness designed based on the hydraulic system's operating pressure, typically 5 to 10 mm. They are formed using a precision casting process to ensure dimensional accuracy and structural strength. The multiple hydraulic chambers 4 are arranged in an annular or honeycomb pattern within the first spiral blade 2 and / or the second spiral blade 3. They are interconnected or independently connected to a hydraulic distribution unit via corrosion-resistant, high-strength hydraulic piping.

[0043] The hydraulic system is connected to multiple hydraulic chambers 4 and is used to adjust the hydraulic pressure in the multiple hydraulic chambers 4. The hydraulic system specifically includes a hydraulic pipeline connected to the multiple hydraulic chambers 4, and a hydraulic pump 6 and a hydraulic valve 5 arranged on the hydraulic pipeline. The hydraulic pump 6 uses a high-pressure plunger pump with a rated pressure design of 30~50MPa and a flow rate that can be adjusted as needed within the range of 5~20L / min. The hydraulic valve 5 uses a combination of an electromagnetic reversing valve and a proportional pressure reducing valve to achieve precise control of the flow and pressure of the hydraulic oil. The connection parts of the hydraulic pipeline all use double-ferrule joints, which have good sealing and vibration resistance, can effectively prevent hydraulic oil leakage, and are easy to install and disassemble. The hydraulic system also includes an accumulator 7, specifically a bladder-type accumulator with a volume of 10~30L, which is used to store excess hydraulic oil and energy to cope with sudden load changes and stabilize the system pressure.

[0044] The monitoring and control system includes a control system 9 and multiple stress sensors 8. Stress sensors 8 are installed on the screw pile shaft assembly, specifically at the connection between the uniform diameter steel pipe 1 and the first spiral blade 2, and at the connection between the uniform diameter steel pipe 1 and the second spiral blade 3. They monitor internal forces, such as stress and strain, at these key locations in real time. Furthermore, stress sensors 8 can be equipped with independent temperature compensation devices to mitigate the effects of ocean temperature fluctuations on sensor measurement accuracy. The control system 9 is electrically connected to the stress sensors 8 and the hydraulic system's hydraulic pump 6 and hydraulic valve 5. The control system 9 utilizes a programmable logic controller (PLC) or microprocessor, offering powerful data processing capabilities and rapid response speeds, with a control response time of less than 0.1 seconds. The control system 9 can also be equipped with a wireless communication module to enable remote monitoring and data transmission. The control system 9 incorporates an intelligent algorithm, such as a combination of fuzzy control and neural network algorithms. Based on the internal force information received from the stress sensors 8 and in conjunction with a pre-set control strategy or learning model, it issues commands to the hydraulic pump 6 and hydraulic valve 5 to control their operating states, thereby regulating the hydraulic oil pressure within the multiple hydraulic chambers 4. For example, if a part of the pile body is subjected to excessive force or deformation beyond the allowable range, the control system 9 controls the hydraulic pump 6 to inject hydraulic oil into the corresponding hydraulic chamber 4, increasing the stiffness of that area. Conversely, if the force is too great, the hydraulic oil is withdrawn, reducing the stiffness of that area. The control system 9 can also incorporate multiple safety protection mechanisms. If sensor data fluctuates abnormally, hydraulic system pressure exceeds a safety threshold, or equipment malfunctions, emergency procedures are automatically initiated, such as stopping the hydraulic pump and closing the hydraulic valve.

[0045] An embodiment of the present invention further discloses a method for constructing offshore wind power stiffness adaptive spiral piles, the method comprising the following steps:

[0046] S1. Prefabrication and Assembly: Onshore, prefabricate components including the uniform diameter steel pipe 1, first spiral blade 2, second spiral blade 3, hydraulic chamber 4, hydraulic valve 5, hydraulic pump 6, accumulator 7, stress sensor 8, and control system 9 according to design requirements. During the prefabrication process, the dimensions, materials, and performance parameters of each component are strictly controlled in accordance with design standards. For example, the uniform diameter steel pipe 1 is machined and anti-corrosion coatings are applied; the spiral blade steel plates are cut and welded to form, and the hydraulic chamber positions are reserved; the hydraulic chamber is precision-casted and flaw-detected; the hydraulic pump, valve, and accumulator are selected and tested; the stress sensor is calibrated and calibrated; the control system hardware is assembled, and the built-in algorithm is written and implemented. After prefabrication of all components is completed, preliminary assembly is carried out onshore. The first and second spiral blades 2 and 3 are welded to the predetermined locations on the uniform diameter steel pipe 1, the hydraulic chamber 4 is installed and connected to the hydraulic piping, and the stress sensor 8 and control system 9 are installed and connected to the relevant wiring. The smooth connections of each component and the overall structure are checked to ensure compliance with design requirements. The hydraulic system is pressure-tested, and the control system is initially debugged.

[0047] S2. Transportation and Pile Driving: The assembled offshore wind turbine adaptive stiffness spiral piles are hoisted and transported to the target sea area by ship. During transportation, the spiral piles must be properly protected to prevent damage from collisions or vibrations. Upon arrival at the target sea area, the spiral piles are driven using specialized piling equipment such as hydraulic pile hammers, vibratory hammers, or specialized screw-in equipment. The piles are driven into the underwater soil to the designed depth. During the pile driving process, the verticality and depth of the piles must be monitored in real time to ensure that the piles sink vertically and meet the designed depth.

[0048] S3. Start monitoring: After the screw pile is sunk into place, the monitoring control system is activated and put into operation. The stress sensor 8 begins to monitor the internal force information of the screw pile body assembly in real time, such as the stress changes at the connection between the blade and the pile body, and transmits the collected data to the control system 9 in real time.

[0049] S4. Adaptive stiffness adjustment: The control system 9 uses a built-in intelligent algorithm to analyze and process the received internal force information to determine the stress state and change trend of the pile body. When it is determined that a specific part of the spiral pile body assembly, such as a blade or a certain area of ​​the blade, is subjected to excessive stress or deformation that is likely to exceed the allowable range, the control system 9 will issue a command to the hydraulic pump 6 and the corresponding hydraulic valve 5 of the hydraulic system, controlling the hydraulic pump 6 to inject hydraulic oil into the hydraulic chamber 4 corresponding to the specific part, causing the hydraulic chamber 4 to expand, thereby increasing the stiffness of the blade in that part to resist external loads and reduce stress concentration or deformation. For example, during the operation of the wind turbine, if strong winds occur and the pile body is subjected to large lateral shear forces, the stress sensor 8 will detect a significant increase in stress at the connection between the first spiral blade 2 and the uniform diameter steel pipe 1. The control system 9 will then control the hydraulic pump 6 to inject hydraulic oil into the hydraulic chamber 4 corresponding to that part, increasing the stiffness of that area. On the contrary, if the stiffness of a certain part needs to be reduced, for example, in order to reduce pile driving resistance or optimize stress distribution under specific geological conditions, the control system 9 can control the hydraulic valve 5 to extract part of the hydraulic oil from the corresponding hydraulic chamber 4.

[0050] Throughout the life cycle of the screw pile, regular maintenance and inspection are required. For example, the measurement accuracy of the stress sensor 8 should be checked and, if necessary, calibrated and verified by comparing it to a standard pressure source. The hydraulic system should be inspected for leaks, with a particular focus on the seals at the hydraulic piping connections, the hydraulic pump 6, and the hydraulic valve 5. If leaks are detected, the seals should be repaired or replaced promptly. The operating status of the control system 9 should be checked to ensure normal data processing and stable communication. Based on actual operating conditions and monitoring data, the control strategy parameters of the control system 9 can be adjusted and optimized to ensure that the screw pile is always in good working condition.

[0051] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An offshore wind power stiffness adaptive screw pile, characterized by: The offshore wind power stiffness adaptive screw pile includes: A screw pile body assembly, comprising a steel pipe of equal diameter (1), a first spiral blade (2) and a second spiral blade (3) fixed to the outer wall of the steel pipe of equal diameter (1), wherein the first spiral blade (2) is located at the upper part of the steel pipe of equal diameter (1), and the second spiral blade (3) is located at the lower part of the steel pipe of equal diameter (1); a plurality of hydraulic chambers (4), the plurality of hydraulic chambers (4) being arranged inside the first spiral blade (2) and / or the second spiral blade (3); a hydraulic system, the hydraulic system being in communication with the plurality of hydraulic chambers (4) and being used to adjust the hydraulic pressure in the plurality of hydraulic chambers (4); A monitoring and control system, comprising a control system (9) and at least one stress sensor (8), wherein the stress sensor (8) is arranged on the screw pile body assembly and is used to monitor internal force information of the screw pile body assembly, the control system (9) is electrically connected to the stress sensor (8) and the hydraulic system, and the control system (9) is configured to control the hydraulic system to adjust the hydraulic pressure in the plurality of hydraulic chambers according to the internal force information monitored by the stress sensor (8).

2. The offshore wind power stiffness adaptive screw pile according to claim 1, characterized in that: The first spiral blade (2) and the second spiral blade (3) are both formed by enclosing at least two layers of plate structures, and the multiple hydraulic chambers (4) are arranged between the at least two layers of plate structures.

3. The offshore wind power stiffness adaptive screw pile according to claim 1 or 2, characterized in that: The multiple hydraulic chambers (4) are distributed in a ring shape or a honeycomb shape inside the first spiral blade (2) and / or the second spiral blade (3).

4. The offshore wind power stiffness adaptive screw pile according to claim 1, characterized in that: The stress sensor (8) is arranged at the connection between the equal-diameter steel pipe (1) and the first spiral blade (2) and / or at the connection between the equal-diameter steel pipe (1) and the second spiral blade (3).

5. The offshore wind power stiffness adaptive screw pile according to claim 1, characterized in that: The hydraulic system comprises a hydraulic pipeline connected to the hydraulic chamber (4), and a hydraulic pump (6) and a hydraulic valve (5) arranged on the hydraulic pipeline; the control system (9) adjusts the hydraulic pressure in the hydraulic chamber (4) by controlling the working states of the hydraulic pump (6) and the hydraulic valve (5).

6. The offshore wind power stiffness adaptive screw pile according to claim 5, characterized in that: The hydraulic system further comprises an accumulator (7) in communication with the hydraulic pipeline, wherein the accumulator (7) is used to store and release hydraulic energy.

7. The offshore wind power stiffness adaptive screw pile according to claim 1, characterized in that: The diameter of the first spiral blade (2) is greater than the diameter of the second spiral blade (3); the diameter of the first spiral blade (2) is 2 to 3 times the diameter of the equal-diameter steel pipe (1), and the diameter of the second spiral blade (3) is 1.2 to 1.5 times the diameter of the equal-diameter steel pipe (1).

8. The offshore wind power stiffness adaptive screw pile according to claim 1, characterized in that: The interior of the uniform diameter steel pipe (1) is provided with a pipeline channel for laying a pipeline connecting the hydraulic system and the monitoring and control system.

9. A method for constructing offshore wind power adaptive stiffness screw piles according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1, prefabricate and assemble the screw pile body assembly, the hydraulic chamber (4), the hydraulic system and the monitoring and control system to form the offshore wind power stiffness adaptive screw pile; S2. transporting the assembled offshore wind power stiffness adaptive spiral pile to the target sea area and performing pile sinking operations, so that the lower portion of the offshore wind power stiffness adaptive spiral pile penetrates into the underwater soil; S3, after the offshore wind power stiffness adaptive spiral pile is sunk into place, the monitoring and control system is started, the stress sensor (8) monitors the internal force information of the spiral pile body assembly in real time, and transmits the internal force information to the control system (9); S4. The control system (9) controls the hydraulic system to adjust the hydraulic pressure in the plurality of hydraulic chambers (4) based on the received internal force information, so as to adjust the stiffness of the screw pile body assembly.

10. The method for constructing offshore wind power self-adaptive stiffness screw piles according to claim 9, characterized in that: In step S4, when the control system (9) determines that a specific part of the screw pile body assembly is subjected to excessive force, the hydraulic system is controlled to inject hydraulic oil into the hydraulic chamber (4) corresponding to the specific part to increase the rigidity of the part.

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