Single pile foundation anti-drag removal system and method

Abstract

The invention relates to the technical field of offshore wind power engineering foundation construction, in particular to a single pile foundation drag reduction removing system and method.The single pile foundation drag reduction removing system comprises an electroosmosis system and a vacuum system, the electroosmosis system comprises a power source and graphite electrodes, the graphite electrodes are distributed around a pile foundation in the circumferential direction, and the positive electrode of the power source is electrically connected with the pile foundation; the cathode of the power supply is electrically connected with the graphite electrode; the vacuum system comprises a plug sealing assembly and a pump assembly, the plug sealing assembly is installed at the radial section of the pile foundation and provided with a channel communicating with the interior of the pile foundation, and the pump assembly communicates with the plug sealing assembly and vacuumizes the interior of the pile foundation through the plug sealing assembly. The strength of soil around the pile is reduced through combination of electroosmosis and vacuumizing, the pile pulling resistance can be effectively reduced through the synergistic effect of electroosmosis softening and vacuum seepage, force except pile pulling is not added to a pile body in the implementation process, extra vibration or impact load is not applied to a pile foundation, meanwhile, the damage risk of the pile body is reduced, and the recovery integrity rate of the pile foundation is increased; the noise is reduced.

Description

Technical Field

[0001] This application relates to the field of offshore wind power engineering foundation construction technology, and in particular to a single pile foundation drag reduction and removal system and method. Background Technology

[0002] In scenarios such as offshore wind turbine dismantling and marine engineering pile foundation replacement, seabed soil often exhibits complex characteristics of high water content and high cohesion. This leads to the core problem of excessive pile-soil interface cohesion in traditional pile extraction techniques, which can easily cause pile fracture and low recovery efficiency. Currently mainstream drag-reduction removal technologies have significant drawbacks: Mechanical excavation methods cause significant disturbance during construction, which can easily lead to large-scale subsidence of the seabed and damage to the marine ecosystem. Furthermore, they are subject to space constraints in pile foundation operations, resulting in a substantial reduction in efficiency. Chemical grouting relies on expensive chemicals, resulting in high costs. Furthermore, the grouting process and its residues can easily pollute the marine environment and hinder subsequent ecological restoration. Vibratory pile extraction methods involve high vibration frequencies and loud noise, which not only interfere with the survival of marine life such as fish and mammals, but may also damage the pile structure and increase the risk of pile foundation fracture.

[0003] None of the above technologies can precisely control the characteristics of the seabed soil, and cannot balance drag reduction effect, environmental protection requirements and operation efficiency, making it difficult to meet the construction needs in confined spaces at sea. Summary of the Invention

[0004] This application provides a drag reduction and removal system and method for monopile foundations to solve the problems of high resistance and low efficiency in the removal process of monopile foundations in the prior art.

[0005] On the one hand, this application provides a single-pile foundation drag reduction and removal system, comprising: An electroosmosis system includes a power source and graphite electrodes. The graphite electrodes are distributed circumferentially around the pile foundation. The positive terminal of the power source is electrically connected to the pile foundation, and the negative terminal of the power source is electrically connected to the graphite electrodes. The vacuum system includes a plug assembly and a pump assembly. The plug assembly is installed at the radial section of the pile foundation and has a channel communicating with the interior of the pile foundation. The pump assembly is connected to the plug assembly and evacuates the interior of the pile foundation through the plug assembly.

[0006] In one possible design, a water molecule enrichment sensor is provided on the graphite electrode, and the electroosmosis system also includes a first electrical signal feedback adapter. The water molecule enrichment sensor and the first electrical signal feedback adapter are connected through a first electrical signal transmission line, and a first electrical signal amplifier is provided on the first electrical signal transmission line.

[0007] In one possible design, the sealing components include: A pile cap is installed on the radial section of the pile foundation, and an inlet for the mixture of vented liquid is provided on the pile cap. The valve is installed at the inlet of the liquid mixture to be vented and is connected to the pump assembly through the liquid mixture pipeline.

[0008] In one possible design, the valve is connected to the valve control circuit via a second electrical signal transmission circuit. The valve control circuit includes a second electrical signal amplifier, a second electrical signal feedback converter, and an electrical box connected in sequence. And / or, the valve is also connected to a pressure gauge.

[0009] In one possible design, the sealing assembly also includes a connecting hoop located at the connection between the pile cap and the pile foundation, fitted onto the outer wall of the pile cap and the pile foundation, for connecting the pile cap and the pile foundation. The connecting hoop includes an outer steel pipe and an inner rubber plug. The connecting hoop includes two symmetrically arranged semi-circular hoops, with mating ends at the close ends of the two semi-circular hoops, and the two mating ends are connected by locking bolts.

[0010] In one possible design, a filter layer is provided on the lower end face of the pile cap.

[0011] In one possible design, the lower end face of the pile cap has a mating groove that matches the outer wall of the pile foundation, and a sealing rubber is installed inside the mating groove.

[0012] In one possible design, the upper surface of the pile cap is provided with slings and auxiliary lifting rings, with the slings fixed to the center of the pile cap and the lifting rings located around the slings.

[0013] In one possible design, the pump assembly includes: Vacuum tank, the inlet of which is connected to the pipeline containing the liquid mixture to be vented; Vacuum pump, the inlet of which is connected to the top of the vacuum tank; The gas-water separator has its inlet connected to the outlet of the vacuum pump, and its outlet connected to the main drainage pipe. The water pump's inlet is connected to the lower end of the vacuum tank, and its outlet is connected to the main drainage pipe.

[0014] On the other hand, this application also provides a method for reducing and removing drag on a single pile foundation, employing the above-mentioned single pile foundation drag reduction and removal system, the method comprising: The portion of the pile foundation above the water surface was removed. Install the sealing assembly onto the cut surface of the pile foundation; Activate the electro-osmosis system to allow pore water to flow from the pile foundation to the surrounding soil; After the electroosmosis system stabilizes, the pump assembly is started to create a vacuum in the pile foundation, forming a seepage channel inside, allowing water on the outside of the pile-soil interface to be discharged through the seepage channel inside the pile foundation. Once the electroosmosis system and vacuum system meet the working requirements, the pile foundation is pulled out of the soil using an external pile extraction device.

[0015] The beneficial effects of this application are as follows: The single-pile foundation drag reduction and removal system of this application uses electroosmosis + vacuum to reduce the soil strength around the pile. The synergistic effect of electroosmosis softening and vacuum seepage can reduce the pile extraction resistance by more than 50% (based on theoretical calculations), which is suitable for pile foundation operations and improves recovery efficiency.

[0016] During implementation, no additional forces other than those applied to the pile body will be exerted on the pile body, and no additional vibration or impact loads will be applied to the pile foundation, reducing noise generation and minimizing the impact on the marine environment, making it more environmentally friendly. At the same time, it reduces the risk of pile damage, effectively protecting the pile body, minimizing pile damage, and improving the integrity rate of pile foundation recovery.

[0017] Both the electroosmosis system and the vacuum system are integrated with self-regulating modules, which can dynamically adjust parameters in real time without frequent manual intervention, saving labor costs and ensuring operational stability.

[0018] The absence of mechanical excavation causes soil disturbance, chemical grouting causes marine pollution, and vibration pile extraction causes noise interference, significantly reducing the impact on the marine ecosystem.

[0019] The single-pile foundation drag reduction and removal method provided in this application, because it adopts the single-pile foundation drag reduction and removal system of this application, also includes all the above-mentioned advantages of the single-pile foundation drag reduction and removal system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is an overall schematic diagram of the single-pile foundation drag reduction and removal system of this application; Figure 2 This is a schematic diagram illustrating the drag reduction principle of the single-pile foundation drag reduction and removal system of this application. Figure 3 This is a schematic diagram of the electroosmosis system of the single-pile foundation drag reduction and removal system of this application; Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the pump assembly of the monopile foundation drag reduction and removal system of this application; Figure 6This is a schematic diagram of the sealing component of the monopile foundation drag reduction and removal system of this application; Figure 7 This is a cross-sectional view of the pile cap and pile foundation of the single pile foundation drag reduction and removal system of this application; Figure 8 for Figure 7 Enlarged view of the structure at point B; Figure 9 for Figure 7 Enlarged view of the structure at point C; Figure 10 This is a schematic diagram of the sealing process between the pile cap and the pile foundation in the proposed single-pile foundation drag reduction and removal system. Figure 1 ; Figure 11 This is a schematic diagram of the sealing process between the pile cap and the pile foundation in the single-pile foundation drag reduction and removal system applied for. Figure 2 ; Figure 12 This is a schematic diagram of the sealing process between the pile cap and the pile foundation in the proposed single-pile foundation drag reduction and removal system. Figure 3 ; Figure 13 This is a schematic diagram of the sealing process between the pile cap and the pile foundation in the proposed single-pile foundation drag reduction and removal system. Figure 4 .

[0022] Figure label: 1. Pile foundation; 2. Electroosmosis system; 21. Power supply; 22. Graphite electrode; 23. Water molecule enrichment sensor; 24. First electrical signal feedback adapter; 25. First electrical signal transmission line; 26. First electrical signal amplifier; 3. Vacuum system; 31. Sealing assembly; 311. Pile cap; 3111. Inlet of the liquid mixture to be vented; 3112. Sling; 3113. Auxiliary lifting ring; 312. Valve; 313. Pipeline for the liquid mixture to be vented; 314. Second electrical signal transmission circuit; 315. Valve control circuit; 3151. Second electrical signal amplifier 3152. Second electrical signal feedback adapter; 3153. Electrical box; 316. Pressure gauge; 317. Connecting clamp; 3171. Outer steel pipe; 3172. Inner rubber plug; 3173. Butt joint; 3174. Locking bolt; 318. Filter layer; 319. Sealing rubber; 32. Pump assembly; 321. Vacuum tank; 3211. Drain valve; 322. Vacuum pump; 323. Gas-water separator; 324. Water pump; 325. Pressure regulator; 326. Pressure gauge; 327. Gate valve; 328. Filter; 329. Main drain pipe. Detailed Implementation

[0023] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following is combined Figures 1-13 This application describes a single-pile foundation drag reduction and removal system provided in the embodiments of this application.

[0025] Reference Figure 1 , Figure 2 As shown in the embodiment of this application, the single pile foundation 1 drag reduction and removal system includes an electroosmosis system 2 and a vacuum system 3. Through the synergistic effect of electroosmosis softening and vacuum seepage, the strength of the soil around the pile and the water flow state at the pile-soil interface are dynamically controlled, reducing the pile extraction resistance and achieving the dual goals of efficient recovery of the pile foundation 1 and low disturbance to the marine environment.

[0026] Reference Figure 3 , Figure 4 As shown, the electroosmosis system 2 is used to soften the soil around the pile and includes a power supply 21, a graphite electrode 22, and a self-adjusting module.

[0027] Power supply 21 provides a DC electric field. Its positive terminal is electrically connected to pile 1 through a positive output line (pile 1 acts as the anode), and its negative terminal is electrically connected to graphite electrode 22 through a negative output line (graphite electrode 22 is evenly distributed around pile 1, so that the surrounding soil acts as the cathode).

[0028] Graphite electrodes 22 are arranged in a ring around the outer periphery of the pile foundation 1. The outer side is connected to the electrical signal transmission line, and the inner side is uniformly and densely covered with water molecule enrichment sensors 23, which are used to monitor the moisture status of the soil around the pile.

[0029] The self-regulating module includes a power supply 21, a water molecule enrichment sensor 23, a first electrical signal transmission line 25, a first electrical signal amplifier 26, and a first electrical signal feedback adapter 24. The water molecule enrichment sensor 23 collects the degree of water molecule enrichment in the soil in real time, converts the data into an electrical signal, amplifies it, and transmits it to the first electrical signal feedback adapter 24. After analyzing the signal, the adapter calculates the optimal electroosmotic voltage and feeds it back to the power supply 21 to achieve dynamic voltage regulation and ensure the stability of the electroosmosis process.

[0030] Working principle of electroosmosis system 2: Under the action of a DC electric field, pore water flows from the anode (pile 1) to the cathode (surrounding soil). Due to poor drainage of the soil around the pile, water temporarily accumulates at the pile-soil interface, increasing the soil moisture content and reducing the soil strength; at the same time, electrolysis at the anode generates hydrogen ions (H+). +This process lowers the soil pH, disrupts the clay mineral structure, and converts bound water into free water. The migration of negatively charged clay particles toward the anode further hinders water flow. Together, these factors exacerbate water accumulation at the pile-soil interface and enhance the softening effect.

[0031] Reference Figure 5 , Figure 6 As shown, the vacuum system 3 is used to break the bond at the pile-soil interface, and its core includes a sealing assembly 31 and a pump assembly 32.

[0032] Reference Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the sealing assembly 31 is used to seal the pile foundation 1 and ensure a stable vacuum environment. It includes a pile cap 311, a valve 312, a connecting clamp 317, a filter layer 318, and a sealing rubber 319.

[0033] The pile cap 311 is installed on the radial section of the pile foundation 1 (the section after removing the portion above the water surface). The lower end face of the pile cap 311 forms a mating annular groove that matches the outer wall of the pile foundation 1. A sealing rubber 319 is installed inside the mating annular groove to improve sealing and friction. A lifting sling 3112 is fixed at the center of the upper end face of the pile cap 311 for subsequent hoisting. Auxiliary lifting rings 3113 are evenly arranged around it to facilitate installation and positioning. An inlet 3111 for the mixture of the liquid to be vented is opened on the pile cap 311, and a valve 312 is installed at the inlet 3111.

[0034] Valve 312 is connected to pump assembly 32 via pipeline 313 for the liquid mixture to be vented, and is also connected to pressure gauge 316 and second electrical signal transmission circuit 314 to monitor pipeline pressure. The second electrical signal transmission circuit 314 includes a second electrical signal amplifier 3151, a second electrical signal feedback adapter 3152, and an electrical box 3153, forming a vacuum self-regulating module that can dynamically adjust the opening and closing degree of valve 312 according to pressure data.

[0035] The connecting hoop 317 is fitted onto the outer wall of the connection between the pile cap 311 and the pile foundation 1, and consists of two symmetrical semi-ring hoops. The outer layer of the connecting hoop 317 is a steel pipe, and the inner layer is a rubber plug, ensuring high sealing performance and friction. The semi-ring hoop has a mating end 3173 at the mating end, which is locked by a locking bolt 3174 to further strengthen the sealed connection between the pile cap 311 and the pile foundation 1.

[0036] The filter layer 318 is located on the lower end face of the pile cap 311 and is used to filter mud impurities in the gas-liquid mixture inside the pile to prevent blockage of subsequent pipelines.

[0037] Reference Figure 5 As shown, the pump assembly 32 is installed on the workboat to extract gas from the pile to form a negative pressure, and includes a vacuum tank 321, a vacuum pump 322, a gas-water separator 323, and a water pump 324.

[0038] The front end of the vacuum tank 321 is connected to the valve 312 of the sealing assembly 31 through a pipe. A filter 328 is installed at the inlet to filter impurities in the gas-liquid mixture. The vacuum tank 321 serves as a buffer container to stabilize the system vacuum and avoid pressure fluctuations. The upper layer inside the tank contains water-containing gas, and the lower layer contains water.

[0039] The inlet of the water pump 324 is connected to the lower end of the vacuum tank 321, and the outlet is connected to the main drainage pipe 329 through a pipe. A pressure regulator 325, a pressure gauge 326 and a gate valve 327 are installed on the pipe to pressurize and discharge the water in the lower layer of the vacuum tank 321.

[0040] The inlet of the vacuum pump 322 is connected to the upper end of the vacuum tank 321, and the outlet is connected to the gas-water separator 323. The high-speed rotation creates negative pressure to extract the water-containing gas in the upper layer of the vacuum tank 321.

[0041] The inlet of the gas-liquid separator 323 is connected to the outlet of the vacuum pump 322. The outlet is divided into an exhaust port and a liquid discharge port. Part of the liquid discharged from the liquid discharge port is returned to the vacuum pump 322 as working fluid through the liquid supply pipeline. The other part of the liquid discharged from the liquid discharge port flows into the main drain pipeline 329.

[0042] Working principle of pump assembly 32: After startup, the gas-liquid mixture in the pile enters the pipeline through valve 312 and filter layer 318 of the sealing assembly 31. After impurities are removed by filter 328, it is stored in vacuum tank 321. After static stratification, water pump 324 pressurizes the lower layer of water and discharges it to the main drainage pipeline 329. Vacuum pump 322 draws the upper layer of water-containing gas to gas-liquid separator 323. The separator separates gas and liquid. The gas is discharged directly, and part of the liquid is fed back to drive vacuum pump 322 and discharged. The sewage in vacuum tank 321 is discharged from the bottom drain valve 3211, realizing efficient gas-liquid separation and stable system operation.

[0043] Reference Figure 10 , Figure 11 , Figure 12 , Figure 13 As shown in the embodiment of this application, a method for removing a single pile foundation 1 with reduced drag is also provided. The method uses the above-mentioned single pile foundation 1 drag reduction and removal system to remove the pile foundation 1. The specific steps are as follows: Use a cutting machine to remove the portion of pile 1 above the water surface to reduce the lifting weight and expose the radial section of pile 1. Before on-site installation, the pile cap 311 is pre-connected to the pile foundation 1, and a set of docking ends 3173 are pre-connected using locking bolts 3174. The external hoisting equipment is connected to the auxiliary lifting rings 3113 and slings 3112. The pile cap 311 is hoisted to the docking surface of the pile foundation 1 and closed onto the pile body. The docking position is located according to the position of the sudden change in the thickness of the rubber seal.

[0044] After merging, use locking bolts 3174 to connect and lock the other set of mating ends 3173. After installation, the pile cap 311, pile foundation 1, and connecting hoop 317 form a sealed whole.

[0045] After installation, power is turned on (21) to start the electroosmosis system (2). Pore water flows from the pile (anode) to the surrounding soil (cathode). However, the water in the soil around the pile cannot be discharged quickly, causing temporary accumulation of water near the pile-soil interface, which increases the water content and decreases the strength of the soil around the pile. During this process, the water molecule enrichment sensor (23) monitors the degree of water molecule enrichment in the surrounding soil in real time and converts the information into an electrical signal. This signal is transmitted through an electrical signal amplifier via an electrical signal transmission circuit. The amplified signal is then transmitted to an electrical signal feedback adapter. Guided by the electrical signal, the adapter calculates the electroosmosis voltage and further adjusts it in the form of an electrical signal to ensure the stability of the electroosmosis process.

[0046] After the electroosmosis stabilizes, the vacuum system 3 is started, and the pump assembly 32 and valve 312 are opened. The pressure gauge 316 monitors the pipeline air pressure in real time and adjusts the opening and closing degree of valve 312 through the second electrical signal feedback adapter 3152 to ensure that a stable negative pressure is formed inside the pile. The negative pressure causes water on the outside of the pile-soil interface to be drawn into the pile, forming a seepage channel and destroying the bonding force.

[0047] Once the electroosmosis system 2 (soil softening) and the vacuum system 3 (seepage channel formation) have both met the working requirements, the pile cap 311 is connected to the external pile extraction device via the sling 3112 on the pile cap 311, and the external pile extraction device is activated to pull the pile 1 out of the soil.

[0048] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-pile foundation drag reduction and removal system, characterized in that, include: An electroosmosis system, comprising a power source and graphite electrodes, the graphite electrodes being distributed circumferentially around the pile foundation, the positive terminal of the power source being electrically connected to the pile foundation, and the negative terminal of the power source being electrically connected to the graphite electrodes. A vacuum system, comprising a sealing assembly and a pump assembly, wherein the sealing assembly is installed at a radial section of the pile foundation and has a channel communicating with the interior of the pile foundation, and the pump assembly is connected to the sealing assembly and evacuates the interior of the pile foundation through the sealing assembly.

2. The single-pile foundation drag reduction and removal system according to claim 1, characterized in that, A water molecule enrichment sensor is provided on the graphite electrode, and the electroosmosis system also includes a first electrical signal feedback adapter. The water molecule enrichment sensor and the first electrical signal feedback adapter are connected through a first electrical signal transmission line, and a first electrical signal amplifier is provided on the first electrical signal transmission line.

3. The single-pile foundation drag reduction and removal system according to claim 1, characterized in that, The sealing assembly includes: A pile cap, which can be installed at the radial section of the pile foundation, and the pile cap has an inlet for the mixture of vented liquid; A valve is installed at the inlet of the liquid mixture to be vented and is connected to the pump assembly through the liquid mixture to be vented pipeline.

4. The single-pile foundation drag reduction and removal system according to claim 3, characterized in that, The valve is connected to the valve control circuit via a second electrical signal transmission circuit. The valve control circuit includes a second electrical signal amplifier, a second electrical signal feedback adapter, and an electrical box connected in sequence. And / or, the valve is also connected to a pressure gauge.

5. The single-pile foundation drag reduction and removal system according to claim 3, characterized in that, The sealing assembly also includes a connecting hoop, located at the connection between the pile cap and the pile foundation, and sleeved on the outer wall of the pile cap and the pile foundation for connecting the pile cap and the pile foundation. The connecting hoop includes an outer steel pipe and an inner rubber plug. The connecting hoop includes two symmetrically arranged semi-circular hoops, and the two semi-circular hoops are respectively provided with mating ends at their close ends. The two mating ends are connected by locking bolts.

6. The single-pile foundation drag reduction and removal system according to claim 3, characterized in that, A filter layer is provided on the lower end face of the pile cap.

7. The single-pile foundation drag reduction and removal system according to claim 3, characterized in that, The lower end face of the pile cap is formed with a mating ring groove that matches the outer wall of the pile foundation, and a sealing rubber is provided in the mating ring groove.

8. The single-pile foundation drag reduction and removal system according to claim 3, characterized in that, The upper end face of the pile cap is provided with a sling and an auxiliary lifting ring. The sling is fixed to the center of the pile cap, and the lifting ring is located around the sling.

9. The single-pile foundation drag reduction and removal system according to any one of claims 3-8, characterized in that, The pump assembly includes: A vacuum tank, the inlet of which is connected to the pipeline containing the liquid mixture to be vented; A vacuum pump, the inlet of which is connected to the upper end of the vacuum tank; A gas-water separator, wherein the inlet of the gas-water separator is connected to the outlet of the vacuum pump, and the outlet of the gas-water separator is connected to the main drainage pipeline; A water pump, the inlet of which is connected to the lower end of the vacuum tank, and the outlet of which is connected to the main drainage pipeline.

10. A method for reducing drag and removing single pile foundations, characterized in that, The method of using the single pile foundation drag reduction and removal system according to any one of claims 1-9 includes: The portion of the pile foundation above the water surface was removed. Install the sealing assembly on the cut surface of the pile foundation; Activate the electro-osmosis system to allow pore water to flow from the pile foundation to the surrounding soil; After the electroosmosis system stabilizes, the pump assembly is started to create a vacuum in the pile foundation, forming a seepage channel inside, allowing water on the outside of the pile-soil interface to be discharged through the seepage channel inside the pile foundation. Once the electroosmosis system and vacuum system meet the working requirements, the pile foundation is pulled out of the soil using an external pile extraction device.

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