Steel pipe pile dismantling device and method for offshore wind power under deep water condition

Abstract

The application discloses a device and method for removing offshore wind power steel pipe piles under deep water conditions, which comprises a supporting device and a counterforce device, a hydraulic jack is installed between the supporting device and the counterforce device, the supporting device is used for providing jacking support force for the hydraulic jack, and the counterforce device is used for providing jacking counterforce for the hydraulic jack after being fixedly connected with a steel pipe pile to be removed. The device is simple in structure, does not need to use a high-pressure system during construction, greatly reduces construction difficulty, has little influence of the environment on construction during construction, does not need to consider the influence of the rising and falling tides on construction during the whole construction process, is convenient for construction progress management and control, and can greatly shorten the construction period.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power technology, and specifically relates to a device and method for dismantling offshore wind power steel pipe piles under deep-water conditions. Background Technology

[0002] After the service life of an offshore wind farm expires, the facilities should be dismantled, and all navigational obstructions on site should be removed. Traditional dismantling methods typically involve cutting the pile foundation. This involves installing jet cutting and pumping equipment inside the pile to pump mud from the inside out. Then, shaped charge blasting, diamond wire saws, and high-pressure water abrasive cutting equipment are installed to cut the pile foundation using hydraulic cutters or thermal melting cutting techniques. However, this method has drawbacks, such as the pile foundation remaining on the seabed.

[0003] Chinese patent CN 108797588 A discloses an auxiliary tooling and dismantling process for the overall dismantling of a monopile foundation for an offshore wind turbine on a soft soil seabed. The auxiliary tooling includes a sealing device, a hydraulic pressurization system, an auxiliary dismantling airbag, an airbag inflation device, an auxiliary dismantling airbag support bracket, several wall-mounted vibrators, and a high-pressure sidewall friction-reducing water spray system. This patent dismantles the monopile by inflating the airbag at low tide and converting the buoyancy of the airbag at high tide into an upward lifting force.

[0004] The main flaw in this patent is:

[0005] 1. The implementation of this patent depends on the ebb and flow of the tides at sea, which not only has great uncertainty, but also leads to a long demolition period. As it is an offshore operation, the operating cost is too high.

[0006] 2. This patent requires a hydraulic pressurization system and a high-pressure sidewall friction-reducing spray system, making the equipment relatively complex and difficult to construct. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for dismantling offshore wind turbine steel pipe piles in deep water conditions. This device has a simple structure, is easy to construct, and has minimal impact from the environment, which can effectively shorten the construction period and reduce construction costs.

[0008] The technical objective of this invention is achieved through the following technical solution: a method for dismantling offshore wind turbine steel pipe piles under deep-water conditions, comprising a support device and a reaction device, wherein a hydraulic jack is installed between the support device and the reaction device, the support device is used to provide lifting support force for the hydraulic jack, and the reaction device is fixedly connected to the steel pipe pile to be dismantled and is used to provide lifting reaction force for the hydraulic jack.

[0009] Preferably, the support device includes a precast pipe pile for driving into the soil inside the steel pipe pile to be demolished and a base plate fixedly connected to the top of the precast pipe pile.

[0010] Preferably, the reaction device includes a fixed frame and an adjusting frame. The fixed frame has multiple bolt connection slots of different heights opened laterally, and the fixed frame and the adjusting frame are connected by bolts.

[0011] Preferably, the adjusting frame includes a reaction plate and connecting ears connected to both sides of the reaction plate, the connecting ears being connected to the fixing frame.

[0012] Preferably, a vibrator is installed at the bottom of the reaction plate, and a hollow force transmission rod is also installed between the vibrator and the hydraulic jack.

[0013] Preferably, it also includes a buoyancy device, which is used to provide lifting buoyancy to the steel pipe pile to be demolished after being installed at the lower part of the steel pipe pile to be demolished.

[0014] Preferably, the buoyancy device includes two semi-circular connecting plates connected by bolts, and cable loops are provided on the connecting plates, which are connected to the airbag via airbag cables.

[0015] This invention also provides a method for removing offshore wind turbine steel pipe piles under deep-water conditions, comprising the following steps:

[0016] S1 Installation support device: Multiple precast pipe piles are driven into the soil below the steel pipe piles to be demolished, and a base plate is fixedly installed on the top of the precast filling. The precast pipe piles are used to provide lifting support force for the hydraulic jacks.

[0017] S2 Install the buoyancy device: Pre-connect the two connecting tiles with bolts, pass the two airbag cables through the symmetrical cable loops on both sides, lower the buoyancy device through the cables to a distance of 3m above the mud surface elevation of the steel pipe pile, then fix and tighten the two connecting tiles, keep the airbag with the airbag protection frame in an uninflated state, and install it on the cable loop.

[0018] S3 Install jacks, vibrators and reaction devices: Install hydraulic jacks and vibrators in sequence inside the steel pipe pile to be demolished, weld the fixing frame of the reaction device to the outer surface of the steel pipe pile to be demolished, and bolt the adjusting frame to the fixing frame. The bolt connection position is located in the bolt connection groove at the top of the fixing frame.

[0019] S4 airbag inflation: The airbag is fully inflated, so that the airbag is buoyed and acts on the steel pipe pile;

[0020] S5 connecting steel pipe piles: Connect the hook of the crane on the work vessel to the lifting lugs on both sides of the steel pipe pile;

[0021] S6 Pile Extraction: Simultaneously activate the vibrator and hydraulic jacks, causing the steel pipe pile to be removed to gradually move upward under the combined action of the buoyancy of the buoyancy device, the upward pulling force of the crane on the crane ship, the low-frequency high-frequency vibration of the vibrator, and the upward pulling force of the jacks.

[0022] S7 Adjust the hydraulic jack stroke and reload: After the vertical stroke of the hydraulic jack reaches its maximum stroke, the crane maintains the lifting and tensioning state, restores the hydraulic jack stroke to the predetermined position, moves the connection position between the adjusting frame and the fixed frame downward, connects the adjusting frame to the fixed frame again, starts the hydraulic jack and vibrator to reload and vibrate, and continues to pull the pile upward. Repeat this operation until the steel pipe pile is pulled out.

[0023] S8 device recovery: Recovery of support devices, hydraulic jacks, vibrators and reaction devices, and recovery of buoyancy devices.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The device of the present invention has a simple structure and does not require a high-pressure system during construction, which greatly reduces the difficulty of construction.

[0026] 2. The present invention has minimal impact on construction due to environmental factors, and does not require consideration of the impact of tides on construction throughout the entire process, which facilitates construction progress management and control and can greatly shorten the construction period. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the connection structure between the fixed frame and the adjusting frame in this invention.

[0029] Figure 3 This is a top view of the fixed frame structure in this invention.

[0030] Figure 4 This is a side view of the fixing frame structure in this invention.

[0031] Figure 5 This is a schematic diagram of the buoyancy device in this invention.

[0032] Figure 6 This is a schematic diagram of the structure of the three-end airbag connecting cable in this invention.

[0033] In the above attached diagrams: 1. Steel pipe pile; 2. Soil core; 3. Crane boat; 4. Adjustment frame; 5. Fixing frame; 7. Hydraulic jack; 8. Top plate; 9. Bottom plate; 10. Vibrator; 11. Precast pipe pile; 12. Hollow dowel bar; 20. Airbag protection frame; 21. Airbag; 22. Inlet valve; 23. Airbag connecting column; 24. Main inflation pipe; 25. First branch inflation pipe; 26. Second branch inflation pipe; 27. Three-end airbag connecting cable; 28. Inflation pump; 29. ​​Buoyancy device; 40. Connecting... 41. Reaction plate; 50. Arc-shaped end plate; 51. Lifting lug; 53. Loading reinforcement plate; 54. Support plate; 60. Connecting bolt; 70. Multi-row bolt sliding groove; 71. First bolt sliding groove; 72. Second bolt sliding groove; 73. Third bolt sliding groove; 74. Bolt vertical sliding groove; 270. First connecting tile; 271. Second connecting tile; 272. Cable loop; 273. Bolt; 274. First end of cable; 275. Second end of cable; 276. Third end of cable. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] refer to Figures 1-5 As a preferred embodiment of the present invention, this embodiment provides a device for dismantling offshore wind power steel pipe piles under deep water conditions, including a support device and a reaction device. A hydraulic jack 7 is installed between the support device and the reaction device. The reaction device includes an adjusting frame 4 and a fixing frame 5. The fixing frame 5 includes a loading reinforcing plate 53. The support device includes a precast pipe pile 11.

[0037] In the above embodiment, the precast pipe pile 11 is located in the soil core 2 inside the steel pipe pile 1, and mainly serves to support the hydraulic jack 7 at the end. It is connected to the hydraulic jack 7. The hydraulic jack 7 is provided with a bottom plate 9 and a top plate 8 at both ends. The top lifting lugs 51 are provided on both sides of the top of the steel pipe pile 1 to be demolished.

[0038] Furthermore, a hollow force transmission rod 12 is provided between the reaction device and the hydraulic jack 7. After assembly, the hydraulic jack 7 is located between the base plate 9 and the top plate 8. A vibrator 10 is provided on the upper part of the hollow force transmission rod 12. The adjusting frame 4 includes a connecting lug 40 and a reaction plate 41. The top of the vibrator 10 is the reaction plate 41 of the adjusting frame.

[0039] Furthermore, the fixing frame 5 is composed of an arc-shaped end plate 50, a loading reinforcing plate 53, a support plate 54, and multiple rows of bolt sliding grooves 70. The multiple rows of bolt sliding grooves 70 are composed of a first bolt sliding groove 71, a second bolt sliding groove 72, a third bolt sliding groove 73, and a bolt vertical sliding groove 74. To facilitate the adjustment of the hydraulic jack 7 loading system, the vertical spacing of the multiple rows of bolt sliding grooves 70 is set relatively large. A high clearance is reserved between the reaction plate 41 and the top of the steel pipe pile 1. When all hydraulic jacks 7 reach their maximum stroke, the adjusting frame 4 can be adjusted layer by layer to reduce the clearance between it and the top of the steel pipe pile 1, thus providing a loading stroke distance for the hydraulic jacks 7.

[0040] Furthermore, it also includes a buoyancy device 29, which is used to provide lifting buoyancy to the steel pipe pile to be demolished after being installed at the lower part of the steel pipe pile to be demolished.

[0041] Furthermore, the buoyancy device 29 is composed of a first connecting tile 270, a second connecting tile 271, a cable ring 272, and a bolt 273. The buoyancy device also includes an airbag protection frame 20, an airbag 21, a main inflation pipe 24, and an inflation pump 28. The semi-circular first connecting tile 270 and second connecting tile 271 are connected and fastened to the steel pipe pile 1 by bolts 273. The cable ring is fixedly connected to the first connecting tile 270 and the second connecting tile 271. The cable ring 272 is connected to the airbag through the airbag cable.

[0042] For further details, please refer to the appendix. Figure 1 The airbag 21 is a long cylindrical shape, with an airbag protective frame 20 on its outside. The airbag 21 is composed of multiple sub-airbags connected by airbag connecting columns 23. An air inlet valve 22 is provided at one end of the airbag 21. An air pump 28 is used to fill the airbag 21 with air through the main inflation pipe 24, the first branch inflation pipe 25, and the second branch inflation pipe 26 to drain the air and create a huge buoyancy.

[0043] For further details, please refer to the appendix. Figure 6 The airbag protection frame 20 is connected to the three-end airbag connecting cable 27, which is composed of a first end 274, a second end 275, and a third end 276.

[0044] The above embodiments have a simple structure and do not require a high-voltage system during construction, which reduces the difficulty of extracting the foundation steel pipe piles for offshore wind power.

[0045] Example 2

[0046] This invention also provides a method for removing offshore wind turbine steel pipe piles under deep-water conditions, comprising the following steps:

[0047] S1 Installation support device: For the demolition of ultra-long friction pipe piles, firstly, multiple precast pipe piles 11 are driven into the soil core 2 at the bottom of the steel pipe pile 1 to be demolished, and the base plate 9 is fixedly installed on the top of the precast filling. The precast pipe piles 11 are used to provide lifting support force for the hydraulic jack 7.

[0048] S2. Install the buoyancy device: Pre-connect the steel pipe pile 1 to the first connecting tile 270 and the second connecting tile 271 using bolts 273, ensuring a certain distance between the first connecting tile 270, the second connecting tile 271 and the steel pipe pile 1. Pass the two three-end airbag connecting cables 27 through the symmetrical cable loops 272 on both sides in advance. Lower the buoyancy device 29 through the cables to a distance of 3m above the mud surface elevation of the steel pipe pile, then tighten the bolts 273. (See attached diagram.) Figure 1 and attached Figure 6 As shown, the airbag 21 with the airbag protection frame 20 is kept in an uninflated state. The first end 274 of the three-end airbag connecting cable 27, which has passed through the cable loop 272, is connected and fixed to the airbag protection frame 20. The second end 275 of the cable is fixed to the winch of the crane vessel 3. The airbag 21 is lifted and lowered into the seawater. The winch is rotated, and the airbag 21 is lowered to the elevation under the tension of the cable. The winch is then locked to fix it. The buoyancy device on the other side of the steel pipe pile 1 is then lowered in the same way.

[0049] S3 Install jacks, vibrators and reaction devices: Hydraulic jacks 7 and vibrators 10 are installed sequentially inside the steel pipe pile 1 to be demolished. The loading reinforcement plate 53 of the fixing frame 5 of the reaction device is welded to the outer surface of the steel pipe pile 1 to be demolished. The adjusting frame 4 is connected to the fixing frame 5 by connecting bolts 60. The bolt connection position is located in the first bolt sliding groove 71.

[0050] S4 airbag inflation: Operate the air pump 28 on the crane ship 3 to allow air to enter the airbags on both sides of the steel pipe pile through the main inflation pipe 24, the first branch inflation pipe 25 and the second branch inflation pipe 26 respectively. Each sub-airbag is interconnected through the airbag connecting column. After being inflated to a predetermined pressure, the airbag floats up. The third end 276 of the cable is fixed to the lifting lug 51 on the top of the steel pipe pile, so that the buoyancy of the buoyancy device is fully applied to the steel pipe pile 1.

[0051] S5 connects the steel pipe pile: connect the crane hook on the crane ship 3 to the lifting lugs 51 on both sides of the steel pipe pile 1.

[0052] S6 Pile Extraction: Simultaneously activate the vibrator 10 and the hydraulic jack 7, so that the steel pipe pile 1 to be removed gradually moves upward under the combined action of the buoyancy of the buoyancy device, the upward pulling force of the crane on the crane ship, the low-frequency high-frequency vibration of the vibrator, and the upward pulling force of the jack.

[0053] S7 Adjust the stroke of hydraulic jack 7 and reload: After the vertical stroke of hydraulic jack 7 reaches its maximum stroke, the crane maintains the lifting and tensioning state, restores the stroke of hydraulic jack 7 to the predetermined position, moves the connection position between the adjusting frame 4 and the fixed frame 5 downward, connects the adjusting frame 4 to the fixed frame 5 again, starts hydraulic jack 7 and vibrator 10 to reload and vibrate, and continues to pull the pile upward. This cycle is repeated until the steel pipe pile is pulled out.

[0054] S8 device recovery: Recovery of support devices, hydraulic jacks, vibrators and reaction devices, and recovery of buoyancy devices.

[0055] During the pipe extraction process, the upward resistance and upward force during pile foundation demolition are calculated using the following formulas:

[0056] Uplift resistance = frictional resistance of the outer wall of the pipe pile + frictional resistance of the inner wall of the pipe pile + self-weight of the pipe pile after deducting buoyancy + self-weight of the pile foundation auxiliary structures; Uplift force = jack loading + airbag buoyancy + vibrator dynamic action + crane pulling force.

[0057] In this embodiment, the environment has little impact on construction, and there is no need to consider the impact of tides on construction throughout the entire process. This facilitates construction progress management and control, and can greatly shorten the construction period.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for removing a steel pipe pile of an offshore wind power under deep water conditions, characterized in that, The device comprises a support device and a counterforce device, a hydraulic jack is installed between the support device and the counterforce device, the support device is used to provide jacking support force for the hydraulic jack, the support device comprises a prefabricated pipe pile used to hit the soil in the steel pipe pile to be removed and a bottom plate fixedly connected to the top of the prefabricated pipe pile; the counterforce device is fixedly connected to the steel pipe pile to be removed and is used to provide jacking counterforce for the hydraulic jack; the counterforce device comprises a fixing frame and an adjusting frame, a plurality of bolt connection grooves of different heights are horizontally formed on the fixing frame, the fixing frame is connected to the adjusting frame through bolts, the adjusting frame comprises a counterforce plate and connecting ears connected to the two sides of the counterforce plate, the connecting ears are connected to the fixing frame; a vibration exciter is installed at the bottom of the counterforce plate, a hollow force transmission rod is further installed between the vibration exciter and the hydraulic jack, the hydraulic jack and the vibration exciter are sequentially lowered and installed in the steel pipe pile to be removed, and the fixing frame of the counterforce device is welded to the outer surface of the steel pipe pile to be removed.

2. A deep water offshore wind turbine steel pipe pile removal apparatus according to claim 1, characterised in that, The device further comprises a buoyancy device, which is used to provide jacking buoyancy for the steel pipe pile to be removed after being installed to the lower part of the steel pipe pile to be removed.

3. A deep water offshore wind turbine steel pipe pile removal apparatus according to claim 2, characterised in that, The buoyancy device comprises two semicircular connecting tiles, the two connecting tiles are connected through bolts, cable rings are arranged on the connecting tiles, and the cable rings are connected to air bags through air bag cables.

4. A method for removing offshore wind steel pipe piles under deep water conditions, characterized in that, The device is used for removing the steel pipe pile of offshore wind power under deep water conditions, and comprises the following steps: S1, installing the support device: a plurality of prefabricated pipe piles are hit into the soil at the lower part of the steel pipe pile to be removed, and a bottom plate is fixedly installed at the top of the prefabricated pipe pile, the prefabricated pipe pile is used to provide jacking support force for the hydraulic jack; S2, installing the buoyancy device: two connecting tiles are pre-connected through bolts, two air bag cables are respectively passed through the two symmetric cable rings, the buoyancy device is lowered to a distance of 3 m above the mud surface of the steel pipe pile through the cables, then the two connecting tiles are fixedly tightened, the air bags with air bag protection frames are kept in an uninflated state, and are installed on the cable rings; S3, installing the jack, the vibration exciter and the counterforce device: the hydraulic jack and the vibration exciter are sequentially lowered and installed in the steel pipe pile to be removed, the fixing frame of the counterforce device is welded to the outer surface of the steel pipe pile, the adjusting frame is bolted to the fixing frame, and the bolted position is located in the topmost bolt connection groove on the fixing frame; S4, inflating the air bags: the air bags are fully inflated, so that the air bags act on the steel pipe pile under the action of buoyancy; S5, connecting the steel pipe pile: the hook of the crane on the work ship is connected to the lifting lugs on the two sides of the steel pipe pile; S6, pulling out the pile: the vibration exciter and the hydraulic jack are started at the same time, so that the steel pipe pile to be removed is gradually moved upward under the combined action of the upward force of the buoyancy device, the upward force of the crane, the low-frequency high-frequency vibration of the vibration exciter and the loading of the jack. S7 Adjust the hydraulic jack stroke and reload: After the vertical stroke of the hydraulic jack reaches its maximum stroke, the crane maintains the lifting and tensioning state, restores the hydraulic jack stroke to the predetermined position, moves the connection position between the adjusting frame and the fixed frame downward, connects the adjusting frame to the fixed frame again, starts the hydraulic jack and vibrator to reload and vibrate, and continues to pull the pile upward. Repeat this operation until the steel pipe pile is pulled out. S8 device recovery: Recovery of support devices, hydraulic jacks, vibrators and reaction devices, and recovery of buoyancy devices.

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