Wind power pile foundation recovery device and method

Abstract

The present invention provides a wind power pile foundation recovery device, comprising a power shaft, a support frame, an electromagnetic disturbance plate, a casing, and a control plate. The end of the power shaft is fixedly connected to a connecting block. The support frame is rotatably mounted on the power shaft and fixedly connected to the outer wall of the casing. The electromagnetic disturbance plates are fixed to the connecting block in a circular array. A circular cavity for accommodating the wind power pile foundation is provided in the center enclosed by the electromagnetic disturbance plates. The electromagnetic disturbance plates are connected to a power supply device. The casing is evenly provided with a plurality of water inlet cavities, the water inlet cavities are spaced apart with a plurality of water outlet holes, the casing is provided with a plurality of slots, the control plate is slidably connected in the slots, and the control plate is provided with control holes arranged equidistantly from the water outlet holes and staggered. The present invention also provides a wind power pile foundation recovery method, which performs three disturbances on the soil layer in the casing: segmentation, extrusion, and high-pressure impact. The present invention can better recycle and reuse wind power foundations, reduce foundation investment costs, and has broad development prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power pile recovery, and in particular to a wind power pile foundation recovery device and method. Background Art

[0002] Monopile steel foundations are currently the most commonly used offshore wind turbine foundation worldwide and have been widely adopted in existing offshore wind farms. Offshore wind turbine monopile foundations have a diameter of 6 to 10 meters and a length of approximately 100 meters. They are driven into the seabed using a large hydraulic pile hammer. The upper portion of the monopile is connected to the tower via a flange and bolts. Monopile foundations are suitable for shallow water depths of 10 to 30 meters or medium water depths of 30 to 60 meters, and can accommodate wind turbines of various capacities.

[0003] Single steel foundations are expensive to build and difficult to recover. Existing methods involve excavating the perimeter of the foundation using large excavation equipment and then lifting it out. However, excavation on the seabed is significantly hindered by the seawater, making excavation difficult and costly. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides a wind power pile foundation recovery device and method, which solves the problems in the prior art that excavation operations on the seabed are greatly obstructed by seawater, excavation operations are difficult, costs are high, and recovery is difficult.

[0005] According to the technical solution of the present invention, a wind power pile foundation recovery device includes a power shaft, a support frame, an electromagnetic disturbance plate, a casing and a control board. The top of the power shaft is equipped with a power device to provide vertical force and rotational force for the power shaft. The end of the power shaft is fixedly connected with a connecting block. The support frame is rotatably mounted on the power shaft and is fixedly connected to the outer wall of the casing. There are several electromagnetic disturbance plates and they are fixed on the connecting block in an annular array. The center enclosed by the electromagnetic disturbance plates is provided with a space for accommodating the wind power pile foundation. The circular cavity of the foundation, the electromagnetic disturbance plate is connected to a power supply device to enable the electromagnetic disturbance plate to generate magnetism for adsorbing the wind power pile foundation, the casing is evenly provided with a plurality of water inlet cavities arranged in a circular array parallel to the central axis of the casing, the water inlet cavity is spaced apart with a plurality of water outlet holes leading to the inner cavity of the casing, the casing is provided with a plurality of card slots corresponding to the water inlet cavities, the control board is slidably connected in the card slots, the control board is provided with control holes arranged equidistantly from the water outlet holes and staggered, and the water inlet cavity is connected with a high-pressure pumping device.

[0006] Furthermore, a plurality of limit grooves arranged in a circular array are provided on the inner wall of the casing, the limit grooves are staggered with the water inlet chamber, the electromagnet disturbance plate is arranged in the corresponding limit groove and the width of the limit groove is greater than the width of the electromagnet disturbance plate.

[0007] Furthermore, a circular ring is provided on the top of the control board, and the circular ring is fixedly connected to the control board. A limiting hole perpendicular to the central axis of the power shaft is opened on the circular ring, and a limiting rod matching the limiting hole is threadedly connected to the casing.

[0008] Furthermore, the diameter of the control hole is larger than the diameter of the water outlet hole.

[0009] Furthermore, an annular accumulation groove is provided at the bottom of the casing, and the cross section of the accumulation groove is arc-shaped.

[0010] Furthermore, the bottom end of the casing and the bottom end of the electromagnetic disturbance plate are both provided with an inclined portion which is obliquely inserted into the soil layer.

[0011] Furthermore, the electromagnetic disturbance plate includes a steel plate body and an electromagnet, the electromagnet is fixedly connected to the side of the steel plate body adjacent to the wind power pile foundation, and the electromagnet is adapted to the outer wall of the wind power pile foundation.

[0012] According to another technical solution of the present invention, a wind power pile foundation recovery method, using the above-mentioned recovery device, includes the following steps:

[0013] Align the circular cavity enclosed by the electromagnetic disturbance plate with the wind turbine pile foundation to be recovered, and sink the recovery device under its own weight to install it safely on the soil surface outside the pile foundation;

[0014] The power shaft is connected to an external power device, and the power device applies vertical force and rotational force to the power shaft. The vertical force is applied by the power device to the power shaft, so that the casing and the electromagnetic disturbance plate perform the first cutting disturbance on the soil layer outside the pile foundation, and the casing and the electromagnetic disturbance plate are vertically sunk to the designed depth. The rotational force is applied by the power device to the power shaft, so that the power shaft drives the electromagnetic disturbance plate to perform the second squeezing disturbance on the soil layer inside the casing that has been disturbed for the first time. The first disturbance and the second disturbance are performed alternately.

[0015] After the recovery device is penetrated to the designed position, a high-pressure water flushing operation is carried out. During the penetration of the recovery device, the hole of the control plate just blocks the high-pressure water outlet under the action of its own weight. When high-pressure water flushing is needed, the control plate is lifted to a fixed height by external force so that the water outlet of the high-pressure water flushing and the center of the control hole of the control plate coincide with each other. The recovery device performs a third high-pressure water flushing disturbance on the soil layer that has been disturbed twice. The third disturbance is carried out alternately with the first and second disturbances until the soil layer inside the casing outside the pile foundation is completely destroyed.

[0016] After the recovery device is completely covered on the pile foundation, the power supply device causes the electromagnet disturbance plate to generate magnetic attraction to adsorb the pile foundation, and the recovery device is used to lift the pile foundation with greatly reduced resistance, completing the recovery of the pile foundation.

[0017] The technical principle of the present invention is: using a casing to disconnect the soil layer inside the casing from the external soil layer so as to destroy the wind turbine pile foundation soil layer inside the casing; using the wind turbine pile foundation as a positioning point, the electromagnetic disturbance plate is arranged around the wind turbine pile foundation to avoid the obstruction of seawater, and the electromagnetic disturbance plate is more likely to destroy the soil layer inside the casing; using gravity penetration plus external force rotation, the electromagnetic disturbance plate is distributed in the soil layer outside the wind turbine pile foundation; the electromagnetic disturbance plate is used to perform a first disturbance on the soil layer outside the wind turbine pile foundation to reduce the side friction resistance of the wind turbine pile foundation; combined with the effect of high-pressure water flushing, the loose soil layer inside the casing is disturbed for a second time with high-pressure water to make the side friction resistance of the foundation as close to zero as possible, thereby reducing the external force required for foundation recovery; and then the electromagnetic disturbance plate is connected to a power supply device to generate suction on the wind turbine pile foundation, and the wind turbine pile foundation and the recovery device are lifted out of the seabed together to complete the recovery.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention can realize the recycling of single and multiple wind power pile foundations for both land and sea use, reduce the external force for foundation recycling, improve the recycling rate of wind power pile foundations, reduce the pollution of the project to the ecological environment, avoid the use of large equipment, and reduce the investment cost of wind power.

[0020] (2) When the recovery device of the present invention is penetrated into the bottom of the foundation, vertical penetration and the rotation of the electromagnetic disturbance plate are operated alternately, causing the initial disturbance of the soil outside the foundation, reducing the frictional resistance on the outer side of the foundation while reducing the power required for the next penetration. With the electromagnetic disturbance plate, after being energized, the electromagnetic disturbance plate absorbs the loosened wind turbine pile foundation, making the recovery of the wind turbine pile foundation more convenient and effective.

[0021] (3) The high-pressure water flushing operation of the present invention can further loosen the soil outside the wind turbine pile foundation, reduce the side friction resistance of the wind turbine pile foundation, and reduce the external power required for the recovery of the wind turbine pile foundation.

[0022] (4) The present invention only disturbs the soil within a certain range outside the foundation (the soil inside the casing). During the recovery process of multiple pile foundations, the device can avoid the stress impact on the external environment of other pile foundations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples:

[0024] Figure 1 This is a schematic diagram of a top view of the structure of an embodiment of the present invention;

[0025] Figure 2 For the present invention Figure 1 Schematic diagram of the AA section structure;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the BB cross-section structure.

[0027] In the above drawings: power shaft 1, connecting block 2, support frame 3, electromagnet disturbance plate 4, casing 5, control plate 6, water inlet chamber 7, water outlet hole 8, control hole 9, limit groove 10, ring 11, limit rod 12, stacking groove 13, inclined part 14, pile foundation 15. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0029] like Figures 1-3 As shown, the embodiment of the present invention proposes a wind power pile foundation recovery device, including a power shaft 1, a support frame 3, an electromagnetic disturbance plate 4, a casing 5 and a control board 6. The top of the power shaft 1 is equipped with a power device to provide vertical force and rotational force for the power shaft 1. The end of the power shaft 1 is fixedly connected to a connecting block 2. The support frame 3 is rotatably mounted on the power shaft 1 and is fixedly connected to the outer wall of the casing 5. The electromagnetic disturbance plates 4 are provided in a plurality and are fixed on the connecting block 2 in an annular array. The center enclosed by the electromagnetic disturbance plates 4 is provided with a space for accommodating the wind power pile foundation 1. 5, the electromagnetic disturbance plate 4 is connected to a power supply device so that the electromagnetic disturbance plate 4 generates magnetism for adsorbing the wind power pile foundation 15, and the casing 5 is evenly provided with a plurality of water inlet cavities 7 arranged in a circular array parallel to the central axis of the casing 5, and the water inlet cavity 7 is provided with a plurality of water outlet holes 8 leading to the inner cavity of the casing 5 at intervals, and the casing 5 is provided with a plurality of card slots corresponding to the water inlet cavity 7, and the control board 6 is slidably connected in the card slot, and the control board 6 is provided with control holes 9 arranged equidistantly and staggered with the water outlet holes 8, and the water inlet cavity 7 is connected to a high-pressure pumping device.

[0030] The power device, power supply device model and pumping device model are designed based on the specific dimensions of the pile foundation involved in the present invention.

[0031] The operating steps of this embodiment are: after the recovery device is transported to the vicinity of the pile foundation 15, the recovery device is hoisted and installed according to the position of the pile foundation. First, it is sunk and installed under the action of its own weight. After the device is safely located on the surface of the soil outside the foundation, the main power shaft 1 is connected to the external power equipment, so that the bottom of the device is vertically sunk to the bottom of the pile foundation 15 in batches under the action of external force. At this time, the pile foundation 15 is located in the circular cavity enclosed by the electromagnetic disturbance plate 4. After each external force penetration stops, the main power shaft 1 is provided with rotational power by the external equipment, so that the rotation of the device after penetration disturbs the soil outside the foundation. The external force penetration and external force rotation are completed alternately, which not only reduces the friction resistance on the external side of the foundation but also reduces the intensity of the next external force penetration. Moreover, when the soil condition outside the foundation is poor, the rotation step can selectively avoid the unfavorable soil environment.

[0032] During this process, the recovery device is penetrated into the designated position under the action of external force and then a high-pressure flushing operation is performed. The high-pressure water outlet holes 8 are distributed around the edge of the ring plate. The number of holes of the high-pressure flushing control plate 6 and the high-pressure water outlet holes 8 on the casing 5 are the same, and they are staggered. The holes of the high-pressure flushing control plate 6 just block the high-pressure water outlet holes 8 under the action of its own weight, preventing the soil from entering the water outlet holes 8 during the external force penetration and rotation of the device, thereby affecting the operation of the water outlet holes 8; when high-pressure flushing is required, the control plate 6 is lifted to a fixed height by external force, so that the center of the high-pressure flushing water outlet hole 8 and the hole center of the control plate 6 coincide, and the recovery device can perform a high-pressure flushing operation. The high-pressure water flushing step can completely loosen the soil outside the foundation. The soil is loosened again to make the lateral friction resistance of the foundation as close to zero as possible, reducing the external force required for foundation recovery and avoiding the need for large equipment for foundation recovery. At this time, the electromagnet disturbance plate 4 is charged to form a magnetic attraction on the pile foundation 15. Since the soil layer outside the pile foundation 15 is destroyed, the resistance to the pile foundation 15 is greatly reduced, thereby lifting the pile foundation 15 from the soil layer and completing the recovery of the pile foundation 15.

[0033] like Figure 3 As shown, in another embodiment, the inner wall of the casing 5 is provided with a plurality of limiting grooves 10 arranged in a circular array. The limiting grooves 10 are offset from the water inlet chamber 7. The electromagnetic disturbance plates 4 are disposed in corresponding limiting grooves 10, and the width of the limiting grooves 10 is greater than the width of the electromagnetic disturbance plates 4. The limiting grooves 10 improve the structural strength of the connection between each electromagnetic disturbance plate 4 and the casing 5, and enable the electromagnetic disturbance plate 4 to rotate slightly within the limiting grooves 10, thereby ensuring disturbance while improving the structural stability of the recovery device.

[0034] like Figure 2As shown, in another embodiment, a circular ring 11 is provided on the top of the control panel 6, and the circular ring 11 is fixedly connected to the control panel 6. A limiting hole perpendicular to the central axis of the power shaft 1 is opened on the circular ring 11, and a limiting rod 12 that cooperates with the limiting hole is threadedly connected to the casing 5. The limiting rod 12 is used to cooperate with the limiting hole to fix the control panel 6 at a fixed height so that the control hole 9 of the control panel 6 is aligned with the water outlet 8, which is convenient for accurately adjusting the alignment position of the control panel 6.

[0035] like Figure 2 As shown, in another embodiment, the diameter of the control hole 9 is larger than the diameter of the water outlet hole 8, so as to avoid the control plate 6 having an obstructive effect on the water outlet of the water outlet 8, so that the high-pressure water flowing out of the water outlet 8 is smooth, and the impact force of the high-pressure water is avoided to be reduced.

[0036] like Figure 2 As shown, in another embodiment, an annular accumulation groove 13 is provided at the bottom of the casing 5, and the cross-section of the accumulation groove 13 is arc-shaped. When the casing 5 breaks the soil in the middle and late stages, the accumulation groove 13 provides an accumulation space for loose soil, which facilitates the casing 5 and the electromagnetic disturbance plate 4 to break the soil in the later stage.

[0037] like Figure 2 As shown, in another embodiment, the bottom end of the casing 5 and the bottom end of the electromagnetic disturbance plate 4 are both provided with an inclined portion 14 that is obliquely inserted into the soil layer, which makes it easier for the recovery device to cut into the soil layer more smoothly and more conveniently.

[0038] like Figure 2 、 Figure 3 As shown, in another embodiment, the electromagnetic disturbance plate 4 includes a steel plate body and an electromagnet. The electromagnet is fixedly connected to the side of the steel plate body adjacent to the wind turbine pile foundation 15, and the electromagnet is adapted to the outer wall of the wind turbine pile foundation 15. The electromagnet disposed on the side of the pile foundation 15 has a greater suction force on the pile foundation 15, facilitating the lifting of the pile foundation 15.

[0039] like Figures 1-3 As shown, the embodiment of the present invention also proposes a wind power pile foundation recovery method, using the above recovery device, including the following steps:

[0040] Align the circular cavity enclosed by the electromagnetic disturbance plate 4 with the wind turbine pile foundation to be recovered, and sink the recovery device under the action of its own weight to install it safely on the soil surface outside the pile foundation;

[0041] The power shaft 1 is connected to an external power device, and the power device applies vertical force and rotational force to the power shaft 1. The vertical force is applied by the power device to the power shaft 1, so that the casing 5 and the electromagnetic disturbance plate 4 perform a first cutting disturbance on the soil layer outside the pile foundation, and the casing 5 and the electromagnetic disturbance plate 4 are vertically sunk to the designed depth. The rotational force is applied by the power device to the power shaft 1, so that the power shaft 1 drives the electromagnetic disturbance plate 4 to perform a second squeezing disturbance on the soil layer inside the casing 5 that has been disturbed for the first time. The first disturbance and the second disturbance are performed alternately.

[0042] After the recovery device is penetrated to the designed position, a high-pressure flushing operation is performed. During the penetration of the recovery device, the hole of the control plate 6 just blocks the high-pressure water outlet hole 8 under the action of its own weight. When high-pressure flushing is needed, the control plate 6 is lifted to a fixed height by external force so that the center of the high-pressure flushing water outlet hole 8 and the control hole 9 of the control plate 6 coincide with each other. The recovery device performs a third high-pressure flushing disturbance on the soil layer disturbed twice. The third disturbance is performed alternately with the first and second disturbances until the soil layer inside the casing 5 outside the pile foundation 15 is completely destroyed.

[0043] After the recovery device is completely covered on the pile foundation, the power supply device causes the electromagnet disturbance plate 4 to generate a magnetic attraction force to adsorb the pile foundation 15, and the recovery device is used to lift the pile foundation with greatly reduced resistance, thereby completing the recovery of the pile foundation 15.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wind power pile foundation recovery device, characterized in that: It includes a power shaft, a support frame, an electromagnetic disturbance plate, a casing and a control board. A power device is installed on the top of the power shaft to provide vertical force and rotational force for the power shaft. The end of the power shaft is fixedly connected to a connecting block. The support frame is rotatably installed on the power shaft and is fixedly connected to the outer wall of the casing. There are several electromagnetic disturbance plates, which are fixed on the connecting block in a ring array. The center enclosed by the electromagnetic disturbance plates is provided with a circular cavity for accommodating the wind power pile foundation. The electromagnetic disturbance plates are connected to a power supply device to enable the electromagnetic disturbance plates to generate magnetism for adsorbing the wind power pile foundation. The casing is evenly provided with several water inlet cavities arranged in a ring array parallel to the central axis of the casing. The water inlet cavities are spaced apart and have passages to There are several water outlet holes in the inner cavity of the casing, and several slots corresponding to the water inlet chamber are provided on the casing. The control plate is slidably connected in the slots. Control holes equidistantly arranged and staggered with the water outlet holes are provided on the control plate, and the water inlet chamber is connected to a high-pressure pumping device; a plurality of limit grooves arranged in a circular array are provided on the inner wall of the casing, and the limit grooves are staggered with the water inlet chamber. The electromagnet disturbance plate is provided in the corresponding limit groove and the width of the limit groove is greater than the width of the electromagnet disturbance plate; a circular ring is provided on the top of the control plate, and the circular ring is fixedly connected to the control plate, and a limit hole perpendicular to the central axis of the power shaft is provided on the circular ring, and a limit rod matching the limit hole is threadedly connected to the casing.

2. A wind power pile foundation recovery device according to claim 1, characterized in that: The diameter of the control hole is larger than the diameter of the water outlet hole.

3. The wind power pile foundation recovery device according to claim 1, characterized in that: An annular accumulation groove is provided at the bottom of the casing, and the cross section of the accumulation groove is arc-shaped.

4. A wind power pile foundation recovery device according to claim 1, characterized in that: The bottom end of the casing and the bottom end of the electromagnet disturbance plate are both provided with an inclined portion which is obliquely inserted into the soil layer.

5. The wind power pile foundation recovery device according to claim 1, characterized in that: The electromagnetic disturbance plate includes a steel plate body and an electromagnet. The electromagnet is fixedly connected to the side of the steel plate body adjacent to the wind power pile foundation, and the electromagnet is adapted to the outer wall of the wind power pile foundation.

6. A wind power pile foundation recovery method, characterized in that: Using the recovery device according to any one of claims 1 to 5 comprises the following steps: Align the circular cavity enclosed by the electromagnetic disturbance plate with the wind turbine pile foundation to be recovered, and sink the recovery device under its own weight to install it safely on the soil surface outside the pile foundation; The power shaft is connected to an external power device, and the power device applies vertical force and rotational force to the power shaft. The vertical force is applied by the power device to the power shaft, so that the casing and the electromagnetic disturbance plate perform the first cutting disturbance on the soil layer outside the pile foundation, and the casing and the electromagnetic disturbance plate are vertically sunk to the designed depth. The rotational force is applied by the power device to the power shaft, so that the power shaft drives the electromagnetic disturbance plate to perform the second squeezing disturbance on the soil layer inside the casing that has been disturbed for the first time. The first disturbance and the second disturbance are performed alternately. After the recovery device is penetrated to the designed position, a high-pressure water flushing operation is carried out. During the penetration of the recovery device, the hole of the control plate just blocks the high-pressure water outlet under the action of its own weight. When high-pressure water flushing is needed, the control plate is lifted to a fixed height by external force so that the water outlet of the high-pressure water flushing and the center of the control hole of the control plate coincide with each other. The recovery device performs a third high-pressure water flushing disturbance on the soil layer that has been disturbed twice. The third disturbance is carried out alternately with the first and second disturbances until the soil layer inside the casing outside the pile foundation is completely destroyed. After the recovery device is completely covered on the pile foundation, the power supply device causes the electromagnet disturbance plate to generate magnetic attraction to adsorb the pile foundation, and the recovery device is used to lift the pile foundation with greatly reduced resistance, completing the recovery of the pile foundation.

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