Wind power suction tube jacket dismantling method for air bag auxiliary type in-pile dredging

Abstract

The invention belongs to the technical field of ocean engineering wind power equipment, and discloses a wind power suction tube jacket dismantling method for air bag auxiliary type in-pile dredging, which comprises the following steps: cutting off the part, exposed out of a soil body, of a suction tube jacket; a soil body in the pipe pile is broken through a high-pressure water column sprayed by the rotary spraying part, and seawater mixed with soil is sucked away through the suction part synchronously; a bottom sealing plate and a top sealing plate which are prefabricated in an infield are welded to the top end and the bottom end of an inner cavity of the suction barrel jacket correspondingly and are sealed; discharging seawater in the pipe pile; synchronously ventilating a plurality of uniformly arranged flexible air bags which are contracted and folded on the top sealing plate to assist the floating of the pipe pile; and slurry generated in the pipe pile process is recycled, treated and then backfilled. The pipe pile is dismantled through the combination of the in-pile desilting and dredging technology and the flexible air bag floating assisting technology, the use of a large crane ship is reduced, the construction efficiency is improved, the dismantling cost is greatly reduced, the economical efficiency is high, and a better environment is created for follow-up engineering through dismantling operation.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering wind power equipment, and in particular to a method for dismantling a wind power suction tube jacket by airbag-assisted dredging in piles. Background Art

[0002] In the field of marine engineering, with the continuous growth in demand for construction and maintenance of offshore wind power facilities, cross-sea bridges and underwater structures, the importance of underwater pile removal and related operations has become increasingly prominent.

[0003] However, traditional steel pipe pile extraction relies on the coordinated operation of lifting equipment and vibratory hammers, which vibrate and liquefy the soil around the pile to reduce frictional resistance and achieve pile extraction. However, this method is limited by the access capabilities of large floating cranes in low-headroom scenarios (such as the base of a new bridge). In narrow spaces or complex terrain, insufficient operating space for the equipment limits operations. While there are improved solutions using floating vessels and hydraulic lifts, adjusting the angle of steel pipe piles inserted obliquely into the silt layer is difficult and costly. Existing underwater split demolition methods are complex and time-consuming, and it is difficult to achieve zero residue. While airbag-assisted demolition has certain application potential, pressure differences during seabed inflation can easily cause the airbags to burst, posing a high safety risk. Furthermore, a complex central control system is required to regulate the inflation volume and pressure, resulting in insufficient reliability. Furthermore, during the construction of bored piles for cross-sea bridges, steel casing deformation is a frequent problem. Complex geological conditions, excessive driving stress, insufficient rigidity, and excessive out-of-roundness can easily lead to buckling and instability of the steel casing. Among the existing treatment methods, underwater electrical cutting is only applicable to partial deformation cases, while the removal and re-insertion method used for severe deformation relies on large equipment, which significantly increases the construction difficulty and cost.

[0004] Therefore, the present invention designs a method for dismantling a wind power suction tube jacket by using an airbag-assisted pile dredging method to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for dismantling a wind power suction tube jacket by airbag-assisted pile dredging, so as to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging, comprising the following steps:

[0007] Cut off the part of the suction tube jacket exposed to the soil, leaving the pipe pile part in the soil;

[0008] The suction head of the dredging system is inserted into the inner cavity of the pipe pile through the telescopic arm. The high-pressure water jet ejected by the rotary jet component breaks the soil inside the pipe pile, and the seawater mixed with mud is sucked away by the suction component at the same time, realizing dredging inside the pile and removing the soil inside the pile;

[0009] The bottom sealing plate and top sealing plate prefabricated in the field are welded to the bottom and top ends of the inner cavity of the suction tube jacket respectively, and sealed by the sealing assembly;

[0010] Compressed gas is introduced into the sealed suction tube jacket to discharge the seawater in the pile through the bottom sealing plate;

[0011] Synchronously ventilate several flexible air bags evenly arranged on the contracted and folded top sealing plate to help the pile float;

[0012] The mud generated during the pipe pile construction is recovered and backfilled after treatment.

[0013] Preferably, a drain valve with a check function is provided at the top of the bottom sealing plate for discharging seawater from the pipe pile; and a plurality of air intake valves with a check function are provided at the top of the top sealing plate for injecting air into the pipe pile.

[0014] Preferably, the top sealing plate is provided with a plurality of airbag interfaces, and the airbag interfaces communicate with the inner cavity of the pipe pile and the flexible airbag.

[0015] Preferably, the sealing assembly includes two sealing grooves provided on the side walls of the top sealing plate, sealing rings are provided in the sealing grooves, and the sealing rings abut against the inner wall of the pipe pile.

[0016] Preferably, a grouting port is provided on the bottom sealing plate, and the grouting port is connected to a grouting pump provided on a sea vessel on the sea surface, so as to fill sealant between the bottom sealing plate and the inner wall of the pipe pile.

[0017] Preferably, a plurality of sacrificial anode blocks are provided at the weld positions of the bottom sealing plate, the top sealing plate and the pipe pile.

[0018] Preferably, anti-fouling coating is sprayed on the welds between the bottom sealing plate, the top sealing plate and the pipe piles.

[0019] Preferably, the top sealing plate is provided with a plurality of monitoring units corresponding to the airbag interfaces, and the monitoring units are electrically connected to the airbag interfaces.

[0020] Preferably, the mud in the process of the pipe pile floating is sequentially subjected to cyclone separation, filtration and electric flocculation treatment, the separated seawater is returned to the ocean, and the separated soil is backfilled into the original foundation pit.

[0021] Preferably, before cutting the pipe piles, the surrounding environment of the pipe piles is manually cleaned and reinforced with sand bags.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention provides a method for dismantling a wind turbine suction tube jacket with airbag-assisted dredging in piles, which cuts off the part of the suction tube jacket exposed to the soil and retains the pipe pile part buried in the soil, providing an operational basis for subsequent dredging and sealing operations in the piles; the dredging system utilizes a rotary jet component to spray a high-pressure water column to crush the soil, and at the same time, the mixed mud is sucked to the water surface processing platform through a suction component to achieve soil removal in the pile, reduce the overall weight of the pipe pile, reduce the friction between the outer wall of the pipe pile and the surrounding seabed, reduce the resistance to dismantling, reduce the tonnage required for lifting, and reduce the cost; the two ends of the pipe pile are double-ended, and the sealing of the two ends of the pipe pile is increased by a sealing component to isolate the pipe pile from the outside world. And ensure long-term sealing; introduce compressed gas into the pipe pile, use compressed air to expel the seawater in the pipe pile to form a cavity and maintain the balance of internal and external pressures, which reduces the overall weight of the pipe pile, reduces the removal pressure, and can also avoid the deformation of the pipe pile by balancing the internal and external pressures; inflate a number of flexible air bags evenly arranged along the circumference of the top sealing plate to assist the pipe pile to float in the seawater, improve the recovery efficiency, and shorten the construction period; at the same time, by adjusting the inflation speed of the flexible air bags, the floating state of the pipe pile can be adjusted to facilitate subsequent recovery and reduce risks; after treatment and separation of the mud and water generated by dredging the pipe piles and recycling, the clean seawater is injected back into the seabed, and the separated solids are backfilled into the foundation pit of the pipe pile, restoring the bearing capacity of the seabed, reducing pollution emissions, and reducing the impact on the marine environment.

[0023] The present invention realizes the removal of pipe piles through the combination of pile internal dredging technology and flexible air bag buoyancy, which reduces the use of large crane ships, improves construction efficiency, greatly reduces the removal cost, is highly economical, and creates a better environment for subsequent projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0025] Figure 1 Schematic diagram of the cross section of the pipe pile of the present invention;

[0026] Figure 2 For the present invention Figure 1 A partial enlarged view of middle A;

[0027] Figure 3 This is a schematic diagram of the bottom sealing plate structure from a top view of the present invention;

[0028] Figure 4 This is a schematic diagram of the top sealing plate structure from above;

[0029] In the figure: 1. Pipe pile; 2. Sand bag; 3. Telescopic arm; 4. Dredging system; 5. Suction head; 6. Jet jet component; 7. Suction component; 8. Bottom sealing plate; 9. Top sealing plate; 10. Flexible airbag; 11. Drain valve; 12. Inlet valve; 13. Airbag interface; 14. Sealing groove; 15. Sealing ring; 16. Grouting port; 17. Grouting pump; 18. Sealant; 19. Sacrificial anode block; 20. Anti-fouling coating; 21. Monitoring unit. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figure 1 - Figure 4 As shown, this embodiment provides a method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging, comprising the following steps:

[0033] Cut off the part of the suction tube jacket exposed to the soil, leaving the pipe pile part in the soil;

[0034] The suction head 5 of the dredging system 4 is inserted into the inner cavity of the pipe pile 1 through the telescopic arm 3. The high-pressure water jet sprayed by the rotary jet component 6 breaks the soil inside the pipe pile 1, and the seawater mixed with mud is sucked away by the suction component 7 at the same time, thereby dredging the pile and removing the soil inside the pile;

[0035] The bottom sealing plate 8 and top sealing plate 9 prefabricated in the inner field are welded to the top and bottom ends of the inner cavity of the suction tube jacket respectively, and sealed by the sealing assembly;

[0036] Compressed gas is introduced into the sealed suction tube jacket to discharge the seawater in the pile 1 through the bottom sealing plate 8;

[0037] Synchronously ventilate a plurality of evenly arranged flexible air bags 10 that are contracted and folded on the top sealing plate 9 to help the pile 1 float;

[0038] The slurry from the pipe pile 1 process is recovered and backfilled after treatment.

[0039] The present invention provides a method for removing a wind power suction tube jacket with airbag-assisted dredging in piles, wherein the part of the suction tube jacket exposed to the soil is cut off, and the part of the pipe pile 1 buried in the soil is retained, thereby providing an operation basis for subsequent dredging and sealing operations in the pile; the dredging system 4 utilizes a rotary jet component 6 to spray a high-pressure water column to crush the soil, and at the same time, the mixed mud is sucked to a water surface processing platform through a suction component 7, thereby removing the soil in the pile, reducing the overall weight of the pipe pile 1, reducing the friction between the outer wall of the pipe pile 1 and the surrounding seabed, reducing the resistance to removal, reducing the tonnage required for lifting, and reducing the cost; double-end sealing is performed on both ends of the pipe pile 1, and the sealing performance of the two ends of the pipe pile 1 is increased by a sealing component, so that the pipe pile 1 is isolated from the outside world and a long-term seal is ensured; the inside of the pipe pile 1 is filled with water. Compressed gas is introduced and used to expel the seawater in the pipe pile 1 to form a cavity and maintain a balance between internal and external pressures, thereby reducing the overall weight of the pipe pile 1, reducing the removal pressure, and preventing the pipe pile 1 from deforming by balancing the internal and external pressures; air is inflated into a number of flexible air bags 10 evenly arranged along the circumference of the top sealing plate 9 to assist the pipe pile 1 in floating in the seawater, thereby improving the recovery efficiency and shortening the construction period; at the same time, by adjusting the inflation rate of the flexible air bags 10, the floating state of the pipe pile 1 is adjusted, facilitating subsequent recovery and reducing risks; after the dredged pipe pile 1 and the recovered muddy water are treated and separated, the clean seawater is re-injected into the seabed, and the separated solids are backfilled into the foundation pit of the pipe pile 1, thereby restoring the seabed bearing capacity, reducing pollutant emissions, and reducing the impact on the marine environment. The present invention realizes the removal of the pipe pile 1 by combining the in-pile dredging technology with the floating assistance of the flexible air bags 10, reducing the use of large crane ships, improving construction efficiency, greatly reducing the removal cost, and being highly economical. The removal operation creates a better environment for subsequent projects.

[0040] In one embodiment of the present invention, the maximum telescopic length of the telescopic arm 3 is not less than 10 m, ensuring that the inner cavity of the pipe pile 1 can be thoroughly cleaned.

[0041] In one embodiment of the present invention, the high-pressure jet pressure of the rotary jet component 6 is 25-30 MPa, which ensures that the soil in the pipe pile 1 can be broken up and layered stripping can be achieved.

[0042] In one embodiment of the present invention, the vacuum suction efficiency of the suction component 7 is not less than 15m 33 / h, ensuring that the delaminated mud and water can be sucked out.

[0043] In one embodiment of the present invention, the amount of soil residue after dredging of the pipe pile 1 is no more than 3%.

[0044] In one embodiment of the present invention, the pressure difference in the pipe pile 1 needs to be monitored during the desilting process, and the threshold value of the pressure difference is -0.3 bar to prevent the wall of the pipe pile 1 from buckling.

[0045] A further optimized solution features a drain valve 11 with a check function at the top of the bottom sealing plate 8, used to drain the seawater from the pile 1. Several air inlet valves 12 with a check function are installed at the top of the top sealing plate 9, used to inject air into the pile 1. The drain valves 11 on the bottom sealing plate 8 and the air inlet valves 12 on the top sealing plate 9 control the discharge and injection of gas and seawater from the pile 1. During use, air inlet valves 12 control the injection of gas, increasing the pressure within the pile 1 and causing the seawater within the pile 1 to be discharged through the drain valves 11. This, in turn, empties the pile 1 of seawater, reducing its weight and facilitating subsequent pile removal. Combined with the buoyancy of the flexible airbag 10, this shortens buoyancy generation time and improves removal efficiency by 30%. Simultaneously, the drain valves 11 and air inlet valves 12 regulate the pressure within the pile 1, balancing the internal and external pressure differentials, preventing compression and deformation of the cylinder and improving operational safety.

[0046] A further optimization scheme features several airbag interfaces 13 on the top sealing plate 9, connecting the inner cavity of the pile 1 with the flexible airbags 10. Several monitoring units 21, corresponding to the airbag interfaces 13, are also provided on the top sealing plate 9 and electrically connected to the airbag interfaces 13. The airbag interfaces 13 on the top sealing plate 9 are used to connect to the flexible airbags 10, which provide auxiliary buoyancy through inflation. Monitoring units 21 are also provided on the top sealing plate 9 to monitor the airbag pressure and the pile 1's posture in real time. The flexible airbags 10, combined with compressed gas, form a composite buoyancy system, enhancing the pile 1's buoyancy. Multiple flexible airbags 10 are symmetrically arranged, and their buoyancy distribution is adjusted through independent inflation to ensure vertical buoyancy of the pile 1, with a verticality error within ±1°. Real-time data from the monitoring units 21 is fed back to the control system, dynamically adjusting the pressure and inflation rate of the flexible airbags 10. Abnormal posture or pressure fluctuations automatically trigger an alarm, reducing manual intervention, improving operational efficiency, and enhancing operational safety by 98%.

[0047] In one embodiment of the present invention, the flexible airbag 10 is mainly composed of a bag body and end metal components, wherein the bag body is the main buoyancy providing part, mainly made of a rubber-mixed fiber composite material, with an outer layer of tear-resistant rubber, a middle layer embedded with a honeycomb aluminum skeleton, and an inner lining of a polyurethane anti-seepage coating; and the end metal components are made of metal material and are connected to the airbag interface 13 to realize inflation of the flexible airbag 10.

[0048] In one embodiment of the present invention, each flexible airbag 10 is equipped with an independent air circuit, the air source of which comes from a ship-borne two-stage air compressor with a low pressure level of 0-1 MPa and a high pressure level of 1-10 MPa, and is connected to the ISO standard airbag interface 13 through a titanium alloy pipeline.

[0049] In one embodiment of the present invention, a pressure controller is provided on the airbag interface 13 , and the plurality of pressure controllers control the synchronous inflation of the plurality of flexible airbags 10 at a rate of 0.01 bar / s, with the initial pressure set to 0.3 bar.

[0050] In one embodiment of the present invention, during inflation, a deep reinforcement learning algorithm simultaneously processes 32 parameters, including flow rate, attitude, and soil resistance, to generate target pressures for each airbag. A proportional valve then adjusts the inflation volume with millisecond-level response. As the cylinder begins to rise, the inertial navigation unit continuously monitors changes in inclination angle. If the deviation exceeds 0.5 degrees, the algorithm immediately initiates differential pressure compensation: the upstream airbag is pressurized by 0.1-0.3 bar, while the downstream side maintains or reduces pressure. Simultaneously, the jet spray arm automatically reduces its operating speed to prevent disturbances from exacerbating imbalances.

[0051] In one embodiment of the present invention, the monitoring unit 21 adopts an inertial measurement unit IMU to collect posture data at a frequency of 100 Hz, and dynamically adjusts the pressure of each flexible airbag 10 in combination with a deep reinforcement learning algorithm. When an inclination angle > 1° is detected, differential pressure compensation is performed according to the formula ΔP = 0.15θ + 0.0 (dθ / dt). The pressure of the flexible airbag 10 is adjusted in real time through the pressure controller and the monitoring unit 21 to ensure that the floating speed is stable within the range of 0.2-0.5 m / s, ensuring the dynamic balance of buoyancy and cylinder force.

[0052] To further optimize the solution, the sealing assembly includes two sealing grooves 14 defined in the sidewalls of the top sealing plate 9. Sealing rings 15 are installed within these grooves, abutting the inner wall of the pile 1. The bottom and top sealing plates 8 and 9 are constructed from 20mm-thick duplex stainless steel, offering high strength and corrosion resistance, ensuring their suitability for subsea use. The outer rings of the duplex stainless steel plates are provided with two sealing grooves 14, while the sealing rings 15 are custom-made double O-rings made of hydrogenated nitrile rubber. These are embedded in the sealing grooves 14 of the bottom and top sealing plates 8 and 9, and then welded to the top and bottom ends of the pile 1 within a dry, high-pressure chamber to secure them.

[0053] In one embodiment of the present invention, in order to increase the structural strength of the duplex stainless steel plate, honeycomb-shaped reinforcement ribs are processed on the duplex stainless steel plate to resist deep-sea pressure.

[0054] To further optimize the solution, a grouting port 16 is provided on the bottom sealing plate 8. This grouting port 16 is connected to a grouting pump 17 installed on a seagoing vessel at sea, which fills the gap between the bottom sealing plate 8 and the inner wall of the pile 1 with sealant 18. During offshore operations, the outlet of the grouting pump 17 on the vessel pumps modified silane sealant 18 into the gaps between the bottom sealing plate 8, the top sealing plate 9, and the pile 1. The sealant solidifies within 20 minutes at seawater temperature, and the injection pressure is dynamically adjusted based on the real-time strain data fed back by the optical fiber sensor to ensure uniform stress distribution on the sealing surface.

[0055] To further optimize the solution, several sacrificial anode blocks 19 are installed at the welds between the bottom sealing plate 8, the top sealing plate 9 and the pile 1; and anti-fouling coating 20 is sprayed at the welds between the bottom sealing plate 8, the top sealing plate 9 and the pile 1. After welding the bottom sealing plate 8, the top sealing plate 9 and the pile 1, the welds are cleaned and helium leak detection is immediately performed. The leakage rate is controlled within 1×10 -5 mbar·L / s, then a zinc-aluminum-magnesium alloy sacrificial anode block 19 is attached to the weld area, and a silicone rubber antifouling coating 20 containing capsaicin slow-release microcapsules is sprayed on the surface to achieve long-term corrosion protection. Combined with subsequent glue injection, a triple protection of "mechanical sealing + glue injection compensation + long-term corrosion protection" is formed.

[0056] Further optimization of the solution involved the mud from pile 1 undergoing cyclone separation, filtration, and electro-flocculation treatment. The separated seawater was returned to the ocean, and the separated soil was backfilled into the original foundation pit. The environmental recovery system was activated throughout the entire ascent. The pumped mud was treated by a ship-mounted cyclone separator and electro-flocculation device. The pumped mud then underwent cyclone separation to remove particles >50μm, ceramic membrane filtration to retain suspended solids >1μm, and 30V electro-flocculation treatment to reduce the turbidity of the discharged water to <5NTU. The purified water was then injected back into the seabed, and the separated soil was compressed and backfilled into the original foundation pit, restoring the seabed's bearing capacity to over 90%. Ultimately, through the coordinated control of multiple systems, the combined goals of a complete cylinder recovery rate of ≥99%, a 58% reduction in operating costs, and zero pollutant emissions were achieved.

[0057] In one embodiment of the present invention, each link of the present invention adopts deep-sea special materials and adaptive control strategies, so that the scheme can still achieve a 98% complete cylinder recovery rate at a water depth of 150 meters, which is nearly three times higher than the traditional process.

[0058] To further optimize the solution, before cutting the pile 1, the surrounding area was manually cleaned and reinforced with sandbags 2. Before demolition work began, sand control equipment was placed on the outside of the pile pipe, and sandbags 2 were used to build a dam around the jacket to retain sand. Because the sediment on the seabed is highly mobile, if the slope of the pit is not fixed, the sediment around the pit will flow back into the existing pit, making the pit unable to meet construction requirements.

[0059] Construction steps:

[0060] First, an engineering vessel equipped with a hydraulic jacking device is positioned directly above the target suction cylinder. An ROV (Remote Operating Vehicle) is then used to release anchor piles with a diameter of 1.2m and a depth of 8m to secure the vessel. Markers are placed at the mud surface locations where the pile legs need to be removed, and then mud removal diving operations are carried out. Divers must then use offshore lifting equipment to clear debris near the seabed below the jacket, such as steel pipes, angle irons, and fishing nets. After the cleanup is complete, sand control equipment is placed outside the piles (1), and sandbags (2) are used to build a dam around the jacket to trap sediment. Because the sediment on the seabed is highly mobile, if the slope of the pit is not fixed, the sediment around the pit will flow back into the already constructed pit, preventing it from meeting construction requirements. Therefore, during the pit construction process, divers enter the water and release the sandbags (2) from the vessel one by one into the sea. Underwater, the divers fill the slope of the pit and around the legs with the sandbags (2). After securing the hypotenuse of the pit, the divers emerge from the water. The diver directed the crane to lower the high-pressure water jet cutter near the steel pile and instructed the crane to slowly move it to the installation location. Divers or an ROV assisted in straightening the high-pressure water jet cutter, passing a chain through the gears of the high-pressure water jet cutter, tightening the chain, connecting the chain, and locking it with a latch. The equipment on the construction support vessel was then activated to begin cutting the outside of the pile leg. The ROV operated a plasma arc cutter (model HYPERCUT-80D) to cut along the circumference of the barrel. During the cutting process, the incision temperature was maintained below 150°C to reduce thermal deformation. After cutting, the cross-section flatness error of the barrel top was less than 2mm.

[0061] Then the rotary jet suction operation is carried out. The three sets of telescopic arms 3 drive the rotary jet component 6 of the suction head 5 of the dredging system 4 to spray water at a pressure of 25MPa. At the same time, the suction component 7 cooperates with the vacuum suction pump to pump water at a pressure of 12m. 3 / h rate to clear the soil in the pile 1, the PTX5012 pressure sensor in the middle of the suction component 7 pipe monitors the vacuum degree in the pile 1 in real time, and automatically opens the compensation valve when the threshold of -0.28bar is reached. 3 Seawater was reinjected at a flow rate of / h. After dredging was completed, the ROV guided the installation of a dry welding chamber with an inner diameter of 8.5m to complete the welding of bottom seal plate 8 at 1.3 times the ambient pressure. ER2594 welding wire was used for double-sided argon arc welding. Post-weld phased array ultrasonic testing showed that the weld penetration rate met the standard of 100%.

[0062] During the installation phase of the top sealing plate 9, the prefabricated top sealing plate 9 containing two symmetrical air inlet valves 12 and four airbag interfaces 13 is docked with the top of the cylindrical body of the pipe pile 1 by means of a hydraulic clamp. The air inlet valve 12 has a built-in spring-loaded check valve, and the airbag interface 13 is connected using ISO14409 standard snap fasteners. After completing the air tightness test, four flexible airbags 10 are evenly deployed along the circumference of the top sealing plate 9 and fixed using a diamond lashing method with a preload force of 7.2kN. When the inflation program is started, the pressure controller inflates synchronously with an initial pressure of 0.3 bar, and the monitoring system feeds back attitude data in real time. When an eastward tilt of 1.2° is detected, the intelligent control system outputs the algorithm of ΔP = 0.15×1.2+0.02×0.8 = 0.196 bar, and pressurizes a flexible airbag 10 on the west side until the inclination angle returns to 0.3°. During the ascent, the drain valve 11 is at 15m 3 The slurry is drained at a rate of 100 / min. The separation system processes the slurry through a cyclone and ceramic membrane, reducing the turbidity of the discharged water to 4.3 NTU. The purified water is then injected back into the stable seabed surrounding the cylinder through a compensation valve. Ultimately, the cylinder rises to the surface at a uniform speed, significantly reducing the time required compared to traditional methods and achieving safe, economical, and environmentally friendly demolition.

[0063] The technical solution of this invention achieves revolutionary adaptability to complex deep-sea working conditions through the deep collaboration of multiple modules. The coordinated design of in-pile dredging and flexible airbag 10 buoyancy assistance is not a simple technical superposition, but rather achieves a synergistic effect of "drag reduction, buoyancy enhancement, and stable operation" through precise mechanical coupling and real-time intelligent control.

[0064] 1. Mechanical synergy of dredging drag reduction and airbag buoyancy

[0065] Traditional demolition relies on large floating cranes to overcome the weight of the barrel and the frictional resistance of the soil, usually requiring a 5000-ton floating crane to provide a pile-pulling force of more than 3000kN. In this solution, the jet dredging system uses 25-30MPa high-pressure water jets to accurately peel off the soil inside the barrel, reducing the lateral friction from 3000kN to less than 200kN. At this point, only 4, 6 or 8 12m cranes with a buoyancy of 150kN are needed. 2 The flexible-grade airbag can provide 1200kN of net buoyancy. Combined with the cylinder's self-buoyancy of about 800kN, the total buoyancy completely covers the remaining resistance. This "dredging-based drag reduction, supplemented by airbags" model reduces the demand for floating cranes from 5000-ton to 200-ton auxiliary vessels, reducing equipment costs by 80%.

[0066] 2. Risk hedging between sealing reliability and system response

[0067] The three-stage sealing system and pressure control form a risk interlock mechanism: when the fiber optic sensor detects a sudden change in local strain on the sealing surface, indicating a leakage risk, it immediately triggers two levels of protection:

[0068] Airbag pressure soft landing: The inflation rate is reduced from 0.1 bar / s to 0.02 bar / s to avoid sudden pressure changes that may exacerbate leakage;

[0069] Dredging emergency braking: The jetting boom pauses propulsion, and the suction system switches to pressure-maintaining mode to maintain pressure balance within the barrel. This cross-system linkage reduces the probability of seal failure from the industry average of 1‰ to 0.02‰.

[0070] 3. Positive cycle of environmental protection and operational efficiency

[0071] The closed soil-water separation system not only meets environmental requirements but also improves seabed stability by optimizing backfill soil gradation, reducing dredging energy consumption by 35% when removing adjacent suction cylinders. This synergistic gain in ecological restoration and engineering efficiency creates a sustainable demolition process chain.

[0072] 4.Benefits generated:

[0073] Dredging efficiency doubles, reducing required buoyancy by 60%. This approach transcends the linear gain limitations of traditional technologies. Furthermore, through in-situ soil backfill and closed-loop energy utilization, each demolition operation creates a better environment for subsequent projects, resulting in an exponential improvement in technical effectiveness. Reducing the need for large crane vessels significantly reduces demolition costs, resulting in high economic efficiency.

[0074] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0075] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging, characterized in that The following steps are involved: Cutting off the portion of the suction tube jacket exposed to the soil, leaving the pipe pile (1) portion in the soil; The suction head (5) of the dredging system (4) is inserted into the inner cavity of the pipe pile (1) through the telescopic arm (3), and the high-pressure water column ejected by the rotary jet component (6) breaks the soil inside the pipe pile (1), and the seawater mixed with the mud is sucked away by the suction component (7) at the same time, thereby achieving dredging inside the pile and clearing the soil inside the pile; The bottom sealing plate (8) and the top sealing plate (9) prefabricated in the inner field are respectively welded to the bottom end and the top end of the inner cavity of the suction tube catheter frame, and sealed by a sealing assembly; Compressed gas is introduced into the sealed suction tube jacket to discharge the seawater in the pipe pile (1) through the bottom sealing plate (8); Synchronously ventilating a plurality of evenly arranged flexible air bags (10) that are contracted and folded on the top sealing plate (9) to assist the pipe pile (1) in floating; The slurry from the pipe pile (1) is recovered and processed before backfilling.

2. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 1 is characterized in that: The top end of the bottom sealing plate (8) is provided with a drain valve (11) with a check function for discharging seawater from the pipe pile (1); the top end of the top sealing plate (9) is provided with a plurality of air intake valves (12) with a check function for injecting air into the pipe pile (1).

3. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 2 is characterized in that: A plurality of airbag interfaces (13) are provided on the top sealing plate (9), and the airbag interfaces (13) communicate with the inner cavity of the pipe pile (1) and the flexible airbag (10).

4. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 1 is characterized in that: The sealing assembly comprises two sealing grooves (14) provided on the side walls of the top sealing plate (9), a sealing ring (15) being provided in the sealing groove (14), and the sealing ring (15) abutting against the inner wall of the pipe pile (1).

5. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 4 is characterized in that: The bottom sealing plate (8) is provided with a grouting port (16), which is connected to a grouting pump (17) provided on a sea vessel on the sea surface, and fills a sealant (18) between the bottom sealing plate (8) and the inner wall of the pipe pile (1).

6. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 5 is characterized in that: A plurality of sacrificial anode blocks (19) are provided at the weld positions of the bottom sealing plate (8) and the top sealing plate (9) and the pipe pile (1).

7. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 6 is characterized in that: The welds between the bottom sealing plate (8), the top sealing plate (9) and the pipe pile (1) are sprayed with an anti-fouling coating (20).

8. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 3 is characterized by: The top sealing plate (9) is provided with a plurality of monitoring units (21) corresponding to the airbag interfaces (13), and the monitoring units (21) are electrically connected to the airbag interfaces (13).

9. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 1 is characterized in that: The mud in the process of the pipe pile (1) floating up is sequentially subjected to cyclone separation, filtration and electric flocculation treatment, the separated seawater is returned to the ocean, and the separated soil is backfilled into the original foundation pit.

10. The method for dismantling a wind turbine suction tube jacket using airbag-assisted pile dredging according to claim 1 is characterized in that: Before the pipe pile (1) is cut, the surrounding environment of the pipe pile (1) is manually cleaned and reinforced with sand bags (2).

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