CN115613574A - Offshore wind power steel pipe pile dismantling device and method under deep water condition - Google Patents

Abstract

The invention discloses a device and a method for removing a marine wind power steel pipe pile under a deepwater condition. The device has a simple structure, a high-pressure system is not required to be adopted during construction, the construction difficulty is greatly reduced, the influence of the environment on construction is small during construction, the influence of tide rise and fall on the construction in the whole construction process is not required to be considered, the construction progress management and control are convenient, and the construction period can be greatly shortened.

Description

Offshore wind power steel pipe pile dismantling device and method under deep water condition

Technical Field

The invention belongs to the technical field of offshore wind power, and particularly relates to a device and a method for dismantling an offshore wind power steel pipe pile under a deep water condition.

Background

After the offshore wind farm is over the service life, the facilities should be dismantled, and all the obstructive objects on the site should be removed. In the traditional demolition process, the pile foundation demolition generally adopts a cutting process, namely, the pile foundation demolition is provided with jet cutting equipment and pump equipment, and slurry is pumped from the inside to the outside of the pile; and then installing equipment such as energy-gathering blasting, a diamond wire saw, high-pressure water abrasive cutting and the like, and cutting the pile foundation by using a hydraulic cutting knife or a hot melting cutting process, wherein the process has the problems that the lower part of the pile foundation still remains on the seabed and the like.

The patent publication No. CN 108797588A discloses an auxiliary tool and a process for integrally removing a single pile foundation of an offshore wind turbine on a soft soil seabed, wherein the auxiliary tool comprises a sealing device, a hydraulic pressurization system, an auxiliary removal air bag, an air bag inflating device, an auxiliary removal air bag supporting bracket, a plurality of wall-mounted vibrators and a high-pressure side wall friction-reducing water spraying system.

The main drawbacks of this patent are:

1. the implementation of the patent needs to depend on the tide of rising and falling at sea, which not only has larger uncertainty, but also causes longer demolition period, and the operation cost is too high due to offshore operation.

2. This patent need rely on water conservancy pressurization system and high-pressure lateral wall antifriction to hinder the water spray system, and equipment is comparatively complicated on the whole, and the construction degree of difficulty is higher.

Disclosure of Invention

The invention aims to provide a device for removing an offshore wind power steel pipe pile under a deep water condition, which has the advantages of simple structure, small construction difficulty, small influence of the environment on the construction, effective shortening of the construction period and reduction of the construction cost.

The technical purpose of the invention is realized by the following technical scheme: the method for dismantling the offshore wind power steel pipe pile under the deep water condition comprises a supporting device and a counter-force device, wherein a hydraulic jack is installed between the supporting device and the counter-force device, the supporting device is used for providing jacking supporting force for the hydraulic jack, and the counter-force device is fixedly connected with the steel pipe pile to be dismantled and then used for providing jacking counter-force for the hydraulic jack.

Preferably, the supporting device comprises a precast tubular pile and a bottom plate, wherein the precast tubular pile is used for driving a soil body in the steel pipe pile to be dismantled, and the bottom plate is fixedly connected to the top of the precast tubular pile.

Preferably, the counterforce device comprises a fixing frame and an adjusting frame, wherein a plurality of bolt connecting grooves with different heights are transversely formed in the fixing frame, and the fixing frame is connected with the adjusting frame through bolts.

Preferably, the adjusting bracket comprises a reaction plate and connecting lugs connected to two sides of the reaction plate, and the connecting lugs are connected with the fixing bracket.

Preferably, a vibration exciter is installed at the bottom of the reaction plate, and a hollow dowel bar is further installed between the vibration exciter and the hydraulic jack.

Preferably, the device further comprises a buoyancy device, and the buoyancy device is used for providing jacking buoyancy for the steel pipe pile to be dismantled after being mounted on the lower portion of the steel pipe pile to be dismantled.

Preferably, 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 with the air bags through air bag cables.

The invention also provides a method for dismantling the offshore wind power steel pipe pile under the deepwater condition, which comprises the following steps:

s1, mounting a supporting device: a plurality of precast tubular piles are driven into the soil body at the lower part of the steel pipe pile to be dismantled, a bottom plate is fixedly installed at the top of the precast filling, and the precast tubular piles are used for providing jacking supporting force for a hydraulic jack;

s2, installing a buoyancy device: the two connecting tiles are pre-connected by bolts, two air bag mooring ropes respectively penetrate through symmetrical cable rope rings on two sides, the buoyancy device is lowered to a distance of 3m above the mud surface elevation of the steel pipe pile through the mooring ropes, then the two connecting tiles are fixedly screwed, an air bag with an air bag protection frame is kept in an uninflated state, and the air bag is installed on the cable rope rings;

s3, mounting a jack, a vibration exciter and a counterforce device: sequentially lowering and installing a hydraulic jack and a vibration exciter in a steel pipe pile pipe to be dismantled, welding a fixed frame of a counterforce device to the outer surface of the steel pipe pile to be dismantled, connecting an adjusting frame with the fixed frame through bolts, and positioning the bolt connecting position in a bolt connecting groove at the top of the fixed frame;

s4, inflating an air bag: fully inflating the air bag to enable the air bag to act on the steel pipe pile after receiving buoyancy;

s5, connecting the steel pipe piles: connecting a hook of a crane on an operation ship with lifting lugs on two sides of the steel pipe pile;

s6, pile pulling: simultaneously starting a vibration exciter and a hydraulic jack, so that the steel pipe pile to be dismantled gradually moves upwards under the combined action of the buoyancy force of the buoyancy device, the upward tension of the crane ship crane, the low-cycle high-frequency vibration effect of the vibration exciter and the loading and upward pulling of the jack;

s7, adjusting the stroke of the hydraulic jack to reload: after the vertical stroke of the hydraulic jack reaches the maximum stroke, the crane keeps a hoisting tensioning state, the stroke of the hydraulic jack is recovered to a preset position, the connecting position of the adjusting frame and the fixing frame is moved downwards, the adjusting frame is connected to the fixing frame again, the hydraulic jack and the vibration exciter are started to be loaded and excited again, the pile is continuously pulled upwards, and the operation is circulated until the steel pipe pile is pulled out;

and S8, device recovery: the device comprises a recovery supporting device, a hydraulic jack, a vibration exciter, a counterforce device and a recovery buoyancy device.

Compared with the prior art, the invention has the following beneficial effects:

1. the device has a simple structure, a high-pressure system is not required to be adopted during construction, and the construction difficulty is greatly reduced.

2. The construction method has small influence on the construction by the environment during construction, does not need to consider the influence of tide rise and fall on the construction in the whole construction process, is convenient for construction progress management and control, and can greatly shorten the construction period.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic view of the connection structure of the fixing frame and the adjusting frame of the present invention.

Fig. 3 is a schematic top view of the fixing frame of the present invention.

Fig. 4 is a side view of the fixing frame of the present invention.

Figure 5 is a schematic view of the construction of the buoyancy device of the present invention.

Figure 6 is a schematic representation of the construction of a three-terminal airbag attachment cable according to the present invention.

In the above drawings: 1. steel pipe piles; 2. a soil core; 3. a crane vessel; 4. an adjusting bracket; 5. a fixed mount; 7. a hydraulic jack; 8. a top plate; 9. a base plate; 10. a vibration exciter; 11. prefabricating a tubular pile; 12. a hollow dowel bar; 20. an airbag protection bracket; 21. an air bag; 22. an intake valve; 23. an air bag communication column; 24. a primary gas-filled tube; 25. a first branch inflation tube; 26. a second branch gas-filled tube; 27. the three-end airbag is connected with a cable; 28. an inflator pump; 29. a buoyancy device; 40. connecting lugs; 41. a reaction plate; 50. an arc-shaped end plate; 51. lifting lugs; 53. loading a reinforcing plate; 54. a support plate; 60. a connecting bolt; 70. a plurality of rows of bolt sliding grooves; 71. a first bolt sliding groove; 72. a second bolt sliding groove; 73. a third bolt sliding groove; 74. a bolt vertical sliding groove; 270. a first connection tile; 271. a second connecting tile; 272. a cable loop; 273. a bolt; 274. a first end of a cable; 275. a second end of the cable; 276. a third end of the cable.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 5, as a preferred embodiment of the present invention, the present embodiment provides a marine wind power steel pipe pile dismantling device under deep water conditions, which includes a support device and a counterforce device, a hydraulic jack 7 is installed between the support device and the counterforce device, the counterforce device includes an adjusting frame 4 and a fixed frame 5, the fixed frame 5 includes a loading reinforcing plate 53, and the support device includes a precast pipe pile 11.

In the above embodiment, the precast tubular pile 11 is located in the soil core 2 in the steel pipe pile 1, and mainly plays a role of supporting the hydraulic jack 7 by the end, and is connected with the hydraulic jack 7, the two ends of the hydraulic jack 7 are respectively provided with the bottom plate 9 and the top plate 8, and pile top lifting lugs 51 are arranged on two sides of the pile top of the steel pipe pile 1 to be dismantled.

Furthermore, a hollow dowel bar 12 is arranged between the counterforce device and the hydraulic jack 7, and after assembly, the hydraulic jack 7 is positioned between the bottom plate 9 and the top plate 8. The upper part of the hollow dowel bar 12 is provided with a vibration exciter 10, the adjusting bracket 4 comprises a connecting lug 40 and a reaction plate 41, and the top of the vibration exciter 10 is provided with the reaction plate 41 of the adjusting bracket.

Further, the fixing frame 5 is composed of an arc-shaped end plate 50, a loading reinforcing plate 53, a supporting plate 54 and a plurality of rows of bolt sliding grooves 70. Multirow bolt sliding tray 70 comprises first bolt sliding tray 71, second bolt sliding tray 72, third bolt sliding tray 73, the vertical sliding tray 74 of bolt, for the convenience adjusts hydraulic jack 7 loading system, multirow bolt sliding tray 70 vertical spacing sets up great, reserve higher headroom between reaction plate 41 and steel-pipe pile 1 pile top, can adjust alignment jig 4 layer by layer when hydraulic jack 7 all reaches the maximum stroke, reduce its and steel-pipe pile 1 pile top headroom, provide loading stroke distance for hydraulic jack 7.

Further, the device comprises a buoyancy device 29, and the buoyancy device 29 is used for providing jacking buoyancy for the steel pipe pile to be dismantled after being installed on the lower portion of the steel pipe pile to be dismantled.

Further, the buoyancy device 29 comprises a first connecting tile 270, a second connecting tile 271, a cable ring 272 and a bolt 273, and further comprises an air bag protection frame 20, an air bag 21, a main inflation pipe 24 and an inflator 28, wherein the first connecting tile 270 and the second connecting tile 271 which are semicircular are connected and fastened on the steel pipe pile 1 through the bolt 273, the cable ring is fixedly connected to the first connecting tile 270 and the second connecting tile 271, and the cable ring 272 is connected with the air bag through an air bag cable.

Further, referring to fig. 1, the air bag 21 is a long cylindrical shape, an air bag protection frame 20 is arranged outside the air bag 21, the air bag 21 is composed of a plurality of sub air bags connected through an air bag communication column 23, one end of the air bag 21 is provided with an air inlet valve 22, and air is filled into the air bag 21 through a main air filling pipe 24, a first branch air filling pipe 25 and a second branch air filling pipe 26 by using an air pump 28 to be drained, so that huge buoyancy is formed.

Further, referring to fig. 6, the airbag protection bracket 20 is connected to a three-ended airbag attachment cable 27, and the three-ended airbag attachment cable 27 is comprised of a cable first end 274, a cable second end 275, and a cable third end 276.

Above-mentioned embodiment, simple structure need not to adopt high-pressure system during the construction, has reduced marine wind power's basic steel-pipe pile tube drawing construction degree of difficulty.

Example 2

The invention also provides a method for dismantling the offshore wind power steel pipe pile under the deepwater condition, which comprises the following steps:

s1, mounting a supporting device: for the dismantling construction of the ultra-long friction pipe pile, firstly, driving a plurality of precast pipe piles 11 into a soil core 2 at the lower part of a steel pipe pile 1 to be dismantled, and fixedly mounting a bottom plate 9 at the top of the precast pipe piles, wherein the precast pipe piles 11 are used for providing jacking supporting force for a hydraulic jack 7;

s2, installing a buoyancy device: the steel pipe pile 1 is connected with a first connecting tile 270 and a second connecting tile 271 and is pre-connected by bolts 273, so that a certain distance is kept between the connection of the first connecting tile 270 and the second connecting tile 271 and the steel pipe pile 1, two three-end air bag connecting cables 27 respectively penetrate through cable rings 272 which are symmetrical on two sides in advance, the buoyancy device 29 is lowered to a distance which is 3m above the mud surface elevation of the steel pipe pile through cables, and then the bolts 273 are fastened, as shown in the attached drawings 1 and 6, an air bag 21 with an air bag protection frame 20 is kept in an uninflated state, the first end 274 of the cable which penetrates through the three-end air bag connecting cable 27 of the cable ring 272 is fixedly connected with the air bag protection frame 20, the second end 275 of the cable is fixed on a winch of a crane ship 3, the air bag 21 is lowered into seawater through the crane air bag 21, the winch is rotated, the air bag 21 is lowered to the elevation under the tensile force of the cable, and the winch is locked to be fixed; then, the buoyancy device on the other side of the steel pipe pile 1 is lowered in the same method;

s3, mounting a jack, a vibration exciter and a counterforce device: sequentially lowering and installing a hydraulic jack 7 and a vibration exciter 10 in a steel pipe pile pipe 1 to be dismantled, welding a loading reinforcing plate 53 of a fixing frame 5 of a counterforce device on the outer surface of the steel pipe pile 1 to be dismantled, connecting an adjusting frame 4 with the fixing frame 5 by using a connecting bolt 60, and positioning the bolt connecting position in a first bolt sliding groove 71;

s4, inflating an air bag: operating an inflator pump 28 on the crane ship 3 to enable air to enter air bags on two sides of the steel pipe pile through a main inflation pipe 24, a first branch inflation pipe 25 and a second branch inflation pipe 26 respectively, enabling all sub air bags to be communicated with each other through an air bag communication column, floating the air bags after inflating for a preset pressure, fixing a third end 276 of a cable on a lifting lug 51 at the pile top of the steel pipe pile, and enabling all buoyancy of a buoyancy device to act on the steel pipe pile 1;

s5, connecting the steel pipe piles: connecting a crane hook on the crane ship 3 with lifting lugs 51 on two sides of the steel pipe pile 1;

s6, pile pulling: simultaneously starting the vibration exciter 10 and the hydraulic jack 7, so that the steel pipe pile 1 to be dismantled gradually moves upwards under the combined action of the buoyancy force of the buoyancy device, the upward tension of the crane ship crane, the low-cycle high-frequency vibration effect of the vibration exciter and the loading and upward pulling of the jack;

s7, adjusting the stroke of the hydraulic jack 7 for reloading: after the vertical stroke of the hydraulic jack 7 reaches the maximum stroke, the crane keeps a hoisting tensioning state, the stroke of the hydraulic jack 7 is recovered to a preset position, the connecting position of the adjusting frame 4 and the fixing frame 5 is moved downwards, the adjusting frame 4 is connected to the fixing frame 5 again, the hydraulic jack 7 and the vibration exciter 10 are started to be loaded and excited again, the pile is continuously pulled upwards, and the operation is circulated until the steel pipe pile is pulled out;

and S8, device recovery: the device comprises a recovery supporting device, a hydraulic jack, a vibration exciter, a counterforce device and a recovery buoyancy device.

In the pipe drawing process, the upper drawing resistance and the upper drawing force in the pile foundation dismantling process are respectively calculated according to the following formulas:

the uplift resistance = the friction resistance of the outer wall of the tubular pile, the friction resistance of the inner wall of the tubular pile, the deadweight of the tubular pile after buoyancy is deducted and the deadweight of an auxiliary structure of the pile foundation; the uplifting force = jack loading + airbag buoyancy + vibration exciter power action + crane uplifting force.

The environment is less to the construction influence when the embodiment is under construction, need not to consider the influence of rise and fall tide to the construction in the whole work progress, and the construction progress management and control of being convenient for can be very big reduction of erection time.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may 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 of them should be covered in the claims of the present invention.

Claims (8)

1. The offshore wind power steel pipe pile dismantling device under the deep water condition is characterized by comprising a supporting device and a counter-force device, wherein a hydraulic jack is installed between the supporting device and the counter-force device, the supporting device is used for providing jacking supporting force for the hydraulic jack, and the counter-force device is fixedly connected with a steel pipe pile to be dismantled and then used for providing jacking counter-force for the hydraulic jack.

2. The offshore wind power steel pipe pile dismantling device under deep water conditions of claim 1, wherein the supporting device comprises a precast pipe pile for driving a soil body in the steel pipe pile to be dismantled and a bottom plate fixedly connected to the top of the precast pipe pile.

3. The device for dismantling the offshore wind power steel pipe pile under the deepwater condition as claimed in claim 1, wherein the counterforce device comprises a fixing frame and an adjusting frame, a plurality of bolt connecting grooves with different heights are transversely formed in the fixing frame, and the fixing frame is connected with the adjusting frame through bolts.

4. The offshore wind power steel pipe pile dismantling device under the deep water condition of claim 3, wherein the adjusting frame comprises a reaction plate and connecting lugs connected to two sides of the reaction plate, and the connecting lugs are connected with the fixing frame.

5. The device for dismantling the offshore wind power steel pipe pile under the deep water condition according to claim 4, wherein a vibration exciter is installed at the bottom of the reaction plate, and a hollow dowel bar is further installed between the vibration exciter and the hydraulic jack.

6. The offshore wind power steel pipe pile dismantling device under the deepwater condition of claim 1, further comprising a buoyancy device, wherein the buoyancy device is used for providing jacking buoyancy for the steel pipe pile to be dismantled after being installed at the lower part of the steel pipe pile to be dismantled.

7. The deep water offshore wind power steel pipe pile dismantling device according to claim 6 and being characterized in that the buoyancy device comprises two semicircular connecting tiles, the two connecting tiles are connected through bolts, a cable ring is arranged on each connecting tile, and the cable ring is connected with the air bag through an air bag cable.

8. The method for dismantling the offshore wind power steel pipe pile under the deepwater condition is characterized by comprising the following steps of:

s1, mounting a supporting device: a plurality of precast tubular piles are driven into the soil body at the lower part of the steel pipe pile to be dismantled, a bottom plate is fixedly installed at the top of the precast filling, and the precast tubular piles are used for providing jacking supporting force for a hydraulic jack;

s2, installing a buoyancy device: the two connecting tiles are pre-connected by bolts, two air bag mooring ropes respectively penetrate through symmetrical cable rope rings on two sides, the buoyancy device is lowered to a distance of 3m above the mud surface elevation of the steel pipe pile through the mooring ropes, then the two connecting tiles are fixedly screwed, an air bag with an air bag protection frame is kept in an uninflated state, and the air bag is installed on the cable rope rings;

s3, mounting a jack, a vibration exciter and a counterforce device: sequentially lowering and installing a hydraulic jack and a vibration exciter in a steel pipe pile pipe to be dismantled, welding a fixed frame of a counterforce device to the outer surface of the steel pipe pile to be dismantled, connecting an adjusting frame with the fixed frame through bolts, and positioning the bolt connecting position in a bolt connecting groove at the top of the fixed frame;

s4, inflating an air bag: fully inflating the air bag to enable the air bag to act on the steel pipe pile after receiving buoyancy;

s5, connecting the steel pipe piles: connecting a hook of a crane on an operation ship with lifting lugs on two sides of the steel pipe pile;

s6, pile pulling: simultaneously starting a vibration exciter and a hydraulic jack, so that the steel pipe pile to be dismantled gradually moves upwards under the combined action of the buoyancy force of the buoyancy device, the upward tension of the crane ship crane, the low-cycle high-frequency vibration effect of the vibration exciter and the loading and upward pulling of the jack;

s7, adjusting the stroke of the hydraulic jack to reload: after the vertical stroke of the hydraulic jack reaches the maximum stroke, the crane keeps a hoisting tensioning state, the stroke of the hydraulic jack is recovered to a preset position, the connecting position of the adjusting frame and the fixing frame is moved downwards, the adjusting frame is connected to the fixing frame again, the hydraulic jack and the vibration exciter are started to be reloaded and excited, the pile pulling upwards is continued, and the operation is circulated until the steel pipe pile is pulled out;

and S8, device recovery: the device comprises a recovery supporting device, a hydraulic jack, a vibration exciter, a counterforce device and a recovery buoyancy device.

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