A device and method for removing pipe piles of cofferdams in a lake crossing project

Abstract

The present invention provides a device and method for removing pipe piles from a cofferdam of a lake crossing project, which belongs to the technical field of pile pipe removal in earthwork engineering, and is used to solve the problem of how to pull out pipe piles after the cofferdam construction is completed in the prior art. The device includes a carrier, a loosening and twisting mechanism, and a pulling-out mechanism, wherein the carrier floats on the water surface; the loosening and twisting mechanism includes a loosening and twisting shell, a tightening ring, and a loosening and twisting cylinder, wherein the loosening and twisting shell is connected to the edge of the carrier through a lifting structure, the tightening ring is rotatably arranged in the loosening and twisting shell, and the two ends of the loosening and twisting cylinder are respectively hinged to the inner wall of the loosening and twisting shell and the outer wall of the tightening ring, and the loosening and twisting cylinder drives the tightening ring to twist back and forth when reciprocating and telescoping, and the inner side of the tightening ring loosens and tightens the pipe piles; the pulling-out mechanism includes a pulling-out shell and a pulling-out cylinder, wherein the shell of the pulling-out cylinder is fixedly connected to the loosening and twisting shell, and the pulling-out shell is arranged on the telescopic shaft of the pulling-out cylinder, and the inner side of the pulling-out shell loosens and tightens the pipe piles. The device combined with the method makes the construction process simple and quick, and provides convenience and flexibility for the removal of pipe piles in cofferdam projects.

Description

Technical Field

[0001] The invention belongs to the technical field of pile pipe removal in earthwork engineering, and in particular relates to a device and method for removing cofferdam pipe piles in a lake crossing engineering project. Background Art

[0002] The construction of a cofferdam across a lake is a key technology in water operations, which aims to create a waterless construction environment. In the early stage of construction, two rows of steel pipe piles are driven into the lake on both sides of the construction area to form a stable enclosure structure. Geogrids, geotextiles and waterproof structures are placed between the two rows of steel pipe piles on the same side to effectively block the gaps and enhance the waterproof performance. Dense soil is filled between the two piles to form a water-proof weir core to ensure that the construction area is isolated from the water.

[0003] Two sets of steel pipe pile cofferdams are laid on both sides of the construction area. Once completed, the pumping operation will be started to quickly drain the lake water in the area to create conditions for subsequent operations. After the construction of bridge pile foundations, underwater tunnels or other projects in the construction area is completed and the structure is stable, the cofferdam needs to be dismantled to restore the water body, and the steel pipe piles need to be recycled for reuse to achieve resource recycling. Therefore, a device is needed to pull out the pipe piles of the cofferdam. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a device and method for removing pipe piles of a cofferdam of a lake crossing project, so as to solve the problem of how to pull out the pipe piles after the cofferdam construction is completed in the prior art.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a device and method for removing pipe piles of a cofferdam of a lake crossing project.

[0006] Among them, a device for removing pipe piles from cofferdams of a lake crossing project:

[0007] It comprises a carrier, a loosening and twisting mechanism and a pulling out mechanism, wherein the carrier floats on the water surface;

[0008] The loosening mechanism comprises a loosening shell, a tightening ring and a loosening cylinder. The loosening shell is connected to one side edge of the carrier through a lifting structure. The tightening ring is rotatably arranged in the loosening shell. The two ends of the loosening cylinder are respectively hinged to the inner wall of the loosening shell and the outer wall of the tightening ring. When the loosening cylinder reciprocates and retracts, it drives the tightening ring to twist reciprocally. A diameter reducing mechanism is arranged on the inner side of the tightening ring for loosening and tightening the pipe pile.

[0009] The pulling mechanism comprises a pulling shell and a pulling cylinder, the shell of the pulling cylinder is fixedly connected to the loosening and twisting shell, the pulling shell is arranged on the telescopic shaft of the pulling cylinder, the telescopic direction is parallel to the axis of the clamping ring, and a clamping mechanism is arranged inside the pulling shell for loosening and tightening the pipe pile;

[0010] The clamping areas of the clamping mechanism and the diameter reducing mechanism are concentric.

[0011] Optionally, the lifting structure includes a lifting cylinder and a first bracket;

[0012] The first bracket includes two sub-brackets arranged opposite to each other, and the loose-twist housing is located in the middle area of ​​the two sub-brackets;

[0013] A cylindrical rod is provided at the contact position between the loose-twist housing and the sub-bracket, and a lifting groove is provided at the contact position between the sub-bracket and the loose-twist housing, wherein the direction of the lifting groove is parallel to the axis of the clamp ring;

[0014] The lifting cylinder is installed in the lifting groove, and a matching ring is arranged at the end of the output shaft of the lifting cylinder. The cylindrical rod on the loose-twist housing is rotationally matched with the matching ring.

[0015] Optionally, the diameter-changing mechanism comprises: a cavity provided on the inner wall of the clamping ring, a telescopic cylinder installed in the cavity, the telescopic direction of the telescopic cylinder pointing to the center of the circle along the radius, and an arc-shaped clamping block provided at the end of the telescopic shaft of the telescopic cylinder;

[0016] Alternatively, the diameter-changing mechanism comprises: a cavity arranged on the inner wall of the tightening ring, a first flexible airbag installed in the cavity, and an arc-shaped clamping block is arranged on the surface of the first flexible airbag facing the center of the circle.

[0017] Optionally, a through area with a "U"-shaped cross-section is provided in the extraction housing, and the clamping mechanism comprises:

[0018] A cavity provided in the extraction housing and opening toward the penetration area, a second flexible airbag provided in the cavity, a surface layer of the second flexible airbag facing the central area being provided with an arc-shaped clamping area and a plane guiding area;

[0019] The arc-shaped clamping area is located inside the "U"-shaped opening of the extraction housing and its central axis coincides with the axis of the clamping ring. The surface of the arc-shaped clamping area is provided with an arc-shaped clamping block;

[0020] The plane guide area is located at one side of the "U"-shaped opening end of the extraction shell, and includes a plate-shaped guide block arranged opposite to the surface of the second flexible airbag, and the two plate-shaped guide blocks are in a trumpet shape.

[0021] Optionally, the surface of the arc-shaped clamping block is provided with convex ridges, and the axis of the convex ridges is parallel to the axis of the clamping ring.

[0022] Optionally, a horizontal placement mechanism is also included, which is used to change the pulled-out pipe pile from a vertical state to a horizontal state.

[0023] Optionally, the horizontal placement mechanism includes a rail frame, a restriction ring and a driver;

[0024] One end of the rail frame is located in the area above the loosening and twisting mechanism, and the other end is connected to the inner side of the carrier body structure. The rail frame is located in the area above the loosening and twisting mechanism and is a straight section. The straight section and the carrier body are connected by an inclined section. The rail frame includes two rails located on both sides of the loosening and twisting mechanism, and slide grooves are provided on the rails.

[0025] The inner ring surface size of the limiting ring matches the pipe pile, and the two sides of the outer ring surface are respectively provided with protruding sliding seats, and the two sliding seats are respectively slidably matched with the sliding grooves on the two sides of the steel rails, and the limiting ring slides along the steel rail frame;

[0026] A limiting frame is provided at the end of the straight section, the limiting frame limits the position of the limiting ring at the end of the straight section, the limiting frame is in contact with the limiting ring, a hole is provided on the limiting frame, and a matching protruding shaft is provided on the limiting ring;

[0027] The driver is a winding motor arranged outside the limiting frame, and a cable is connected to the winding drum of the winding motor. After the cable passes through the hole on the limiting frame, it is fixedly connected to the protruding shaft.

[0028] Optionally, the inner annular surface of the limiting ring is also provided with the diameter-changing mechanism.

[0029] Optionally, the vehicle is formed by splicing a plurality of pontoons, and the pontoons include two groups. The two groups of pontoons are connected by a connecting structure, and the connecting structure is arranged at the bottom between the two groups of pontoons. A groove structure is formed on the upper side of the connecting structure, and the loosening mechanism and the pulling-out mechanism are arranged at the groove structure, and the horizontal placement mechanism is arranged above the groove structure.

[0030] A method for removing pipe piles from a cofferdam of a lake crossing project adopts the above-mentioned device for removing pipe piles from a cofferdam of a lake crossing project, and comprises the following steps:

[0031] In the initial state, the diameter reducing mechanism in the loosening and twisting mechanism maintains a large-diameter state, the extraction cylinder of the extraction mechanism is in a retracted state, the extraction shell of the extraction mechanism contacts the loosening and twisting mechanism, the clamping mechanism in the extraction shell is in a relaxed state, and the limiting ring of the horizontal placement mechanism slides above the loosening and twisting mechanism;

[0032] In the docking state, the carrier adjusts its position, the loosening and twisting mechanism and the pulling mechanism are located above the target pile, the lifting structure drives the loosening and twisting housing and the pulling mechanism to move downward, and the loosening and twisting mechanism and the pulling mechanism cover the top of the pile;

[0033] In the loosening and twisting state, the diameter reducing mechanism of the loosening and twisting mechanism reduces the inner diameter of the clamping ring and clamps the pipe pile, the loosening and twisting cylinder reciprocates and drives the clamping ring to twist reciprocally, and then drives the pipe pile to twist reciprocally, and the fixed connection between the bottom of the pipe pile and the soil layer is loosened;

[0034] In the pulling-out state, the pulling-out cylinder of the pulling-out mechanism pushes the pulling-out shell to move downward, the clamping mechanism of the pulling-out shell clamps the pipe pile, the reducing mechanism of the loosening and twisting mechanism increases the inner diameter of the clamping ring and loosens the pipe pile, the pulling-out cylinder of the pulling mechanism pulls the pulling shell upward and pulls the pipe pile out for a distance, then the reducing mechanism of the loosening and twisting mechanism reduces the inner diameter of the clamping ring and clamps the pipe pile, the clamping mechanism of the pulling shell loosens the pipe pile, the pulling cylinder of the pulling mechanism pushes the pulling shell downward to prepare for the next pulling-out, and the above pulling-out process is repeated;

[0035] In the horizontal state, the top of the pipe pile penetrates the limiting ring, and after the bottom of the pipe pile leaves the lake bottom soil layer, the pipe pile begins to be tilted. The driver controls the sliding distance of the limiting ring on the rail frame through the cable, thereby controlling the tilting angle of the top of the pipe pile. The lower part of the pipe pile is controlled by the loosening and twisting mechanism and the pulling mechanism. The loosening and twisting mechanism and the pulling mechanism tilt with the pipe pile. The pulling and tilting of the pipe pile are carried out simultaneously until the pipe pile is completely pulled out and placed horizontally in the trench structure.

[0036] The pipe pile is transported away, a long cylindrical air bag is installed from the end of the pipe pile and inflated with gas to allow the pipe pile to float, a cable is connected to the pipe pile, the cable is pulled from the shore, the pipe pile is pulled out of the trench structure and pulled back to the shore for recovery.

[0037] As described above, the device and method for removing pipe piles of a cofferdam for a lake crossing project of the present invention have at least the following beneficial effects:

[0038] This device, with its significant low-cost advantage, has greatly reduced the economic burden of project execution. At the same time, its implementation process is simple and fast, and there is no need to call a heavy crane to go deep into the water, which significantly saves time and labor costs. Its design is ingenious, and the required working height is low. Even in an environment with limited space above, it can flexibly and efficiently complete the pipe pile extraction operation, providing convenience and flexibility for cofferdam projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Shown is an overall schematic diagram of the present invention.

[0040] Figure 2 Shown is a top view schematic diagram of the torque release mechanism of the present invention.

[0041] Figure 3 It is a schematic diagram of the loosening and twisting mechanism and the extraction mechanism of the present invention.

[0042] Figure 4 It is a schematic diagram showing the connection between the loosening and twisting mechanism of the present invention and the carrier bracket.

[0043] Figure 5 Shown is a schematic diagram of the diameter-changing mechanism of the torque-releasing mechanism of the present invention.

[0044] Figure 6 Shown is a schematic diagram of the extraction mechanism of the present invention.

[0045] Figure 7 It is a schematic diagram showing the present invention including a horizontal placement mechanism.

[0046] Figure 8 The diagram shows a horizontal state of the present invention.

[0047] Fig. 9 Shown as the present invention Figure 8 A partial enlarged schematic diagram in the middle.

[0048] Fig.10 Shown is a schematic diagram of the construction scene of the present invention.

[0049] Among them: carrier 1, pontoon 10, groove structure 12, loosening mechanism 2, loosening shell 20, cylindrical rod 201, tightening ring 21, loosening cylinder 22, pull-out mechanism 3, pull-out shell 30, pull-out cylinder 31, rail frame 41, slide groove 411, limit frame 412, limit ring 42, protruding shaft 422, driver 43, winding drum 433, lifting cylinder 50, matching ring 501, sub-bracket 51, lifting groove 511, diameter reducing mechanism 6, first flexible airbag 60, arc clamping block 601, convex ridge 6011, clamping mechanism 7, second flexible airbag 70, arc clamping area 701, plane guide area 702, land area 92, lake area 91, construction area 90. DETAILED DESCRIPTION

[0050] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0051] See also Figures 1 to 10 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0052] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0053] For this example, please refer to Figure 1-Figure 3 , an embodiment of a device for removing pipe piles of a cofferdam of a lake crossing project provided by the present invention comprises a carrier 1, a loosening and twisting mechanism 2 and a pulling mechanism 3, wherein the carrier 1 floats on the water surface (lake surface);

[0054] Twist-release mechanism 2 can be found in Figure 2 , including a loosening shell 20, a tightening ring 21 and a loosening cylinder 22. The loosening shell 20 is connected to a side edge of the carrier 1 through a lifting structure. The loosening shell 20 can be lifted and lowered relative to the carrier 1. The tightening ring 21 is rotatably arranged in the loosening shell 20. An annular slide rail can be arranged on the inner side of the loosening shell 20. An annular slide groove is arranged at the bottom of the tightening ring 21 to cooperate with the annular slide rail to realize rotation. The two ends of the loosening cylinder 22 are respectively hinged to the inner wall of the loosening shell 20 and the outer wall of the tightening ring 21. Multiple groups of loosening cylinders 22 can be arranged. Initially, the axis of the loosening cylinder 22 can be made parallel to the tangent of the tightening ring 21. When the loosening cylinder 22 reciprocates and expands, it drives the tightening ring 21 to twist reciprocally. A diameter-changing mechanism 6 is arranged on the inner side of the tightening ring 21 for loosening and tightening the pipe piles, and it can adapt to pipe piles of different calibers.

[0055] The extraction mechanism 3 can be found in Figure 3 , including a pull-out shell 30 and a pull-out cylinder 31, the shell of the pull-out cylinder 31 is fixedly connected to the loosening and twisting shell 20, the pull-out shell 30 is arranged on the telescopic axis of the pull-out cylinder 31, the telescopic direction is parallel to the axis of the clamping ring 21, and a clamping mechanism 7 is arranged inside the pull-out shell 30 for loosening and tightening the pipe pile;

[0056] The clamping areas of the clamping mechanism 7 and the diameter-changing mechanism 6 are concentric, allowing the pipe pile to pass through.

[0057] In the above embodiment, the main working steps of the pipe pile removal device are as follows: Figure 1 and Figure 7 Initially, the carrier 1 moves and adjusts its position so that the clamping ring 21 and the extraction shell 30 are above the first pipe pile, and then the clamping ring 21 and the extraction shell 30 move down to cover the pipe pile; then the clamping ring 21 clamps the pipe pile, but at the same time the extraction shell 30 remains loosened, and the loosening cylinder 22 drives the clamping ring 21 to twist back and forth when it reciprocates, and then drives the pipe pile to twist repeatedly, so that the part of the bottom of the pipe pile inserted into the soil layer is loosened and separated from the soil layer, so that the interaction force between the pipe pile and the soil layer is reduced; finally, the extraction mechanism 3 moves down and holds the pipe pile tightly, the clamping ring 21 loosens the pipe pile, and then the extraction mechanism 3 moves up to pull the pipe pile out a distance, then the clamping ring 21 holds the pipe pile tightly, the extraction mechanism 3 loosens the pipe pile and moves down to hold the pipe pile again, the clamping ring 21 loosens the pipe pile, and the extraction mechanism 3 pulls out a distance again. Repeat the above process until all the pipe piles are pulled out.

[0058] The effect of the above-mentioned embodiment is that the process of pulling out the pipe piles is significantly optimized through the operation mode of twisting first and then pulling out. The effective pulling out of the pipe piles is achieved without relying on heavy cranes and large-scale carriers, which greatly reduces the construction difficulty and cost. Through the reciprocating twisting of the clamping ring, the bottom of the pipe pile is separated from the surrounding soil layer in advance, which significantly reduces the resistance during pulling out, thereby greatly reducing the required pulling out force and avoiding damage to the bottom soil structure during direct pulling out. This design not only simplifies the construction process, but also makes the configuration of construction machinery more streamlined, without the need for additional bulky cranes and large carrier ships, further reducing construction costs. Overall, the device is efficient, economical, and convenient, and provides a new solution for pipe pile removal operations in water projects.

[0059] In this embodiment, Figure 4 As shown, the lifting structure includes a lifting cylinder 50 and a first bracket;

[0060] The first bracket includes two sub-brackets 51 arranged opposite to each other, the loose-twist housing 20 is located in the middle area of ​​the two sub-brackets 51, and the first bracket is fixedly installed on the carrier body;

[0061] A cylindrical rod 201 is provided at the contact position between the loose-twist housing 20 and the sub-bracket 51, and a lifting groove 511 is provided at the contact position between the sub-bracket 51 and the loose-twist housing 20. The direction of the lifting groove 511 is parallel to the axis of the clamp ring 21.

[0062] The lifting cylinder 50 is installed in the lifting groove 511. A matching ring 501 is set at the end of the output shaft of the lifting cylinder 50. The cylindrical rod 201 on the loose-twist housing 20 rotates with the matching ring 501. When the lifting cylinder 50 is extended or retracted, it drives the loose-twist housing 20 to rise and fall along the direction of the lifting groove 511.

[0063] The lifting structure of the above embodiment enables the loosening and twisting mechanism 2 and the extraction mechanism 3 to be lifted relative to the carrier. Its main function is to make the initial positions of the loosening and twisting mechanism 2 and the extraction mechanism 3 higher, especially higher than the initial positions of the loosening and twisting mechanism 2 and the extraction mechanism 3. Figure 7 The upper end of the pipe pile in the lake is shown, so that when it descends, it can cover the pipe pile for subsequent twisting and pulling out operations. The shell of the loosening and twisting mechanism 2 is rotatably connected to the first bracket through the cylindrical rod 201, so that the loosening and twisting mechanism 2 can not only be lifted but also flipped relative to the carrier body, and its function will be supplemented and described later.

[0064] This embodiment can be found in Figure 5 The diameter-changing mechanism 6 includes: a cavity arranged on the inner wall of the clamp ring 21, the cavity can be arranged in multiple groups around the circumference, for example, four groups, and also includes a telescopic cylinder installed in the cavity, the telescopic direction of the telescopic cylinder points to the center of the circle along the radius, and an arc-shaped clamping block 601 is arranged at the end of the telescopic shaft of the telescopic cylinder. When the telescopic cylinder is extended, the arc-shaped clamping block 601 moves toward the center and clamps the pipe pile;

[0065] Alternatively, the diameter-changing mechanism 6 includes: a cavity arranged on the inner wall of the clamping ring 21, a first flexible airbag 60 installed in the cavity, and an arc-shaped clamping block 601 is arranged on the surface of the first flexible airbag 60 facing the center of the circle. When the first flexible airbag 60 is pressurized, the first flexible airbag 60 will bulge, thereby clamping the pipe pile.

[0066] The flexible airbag can use a softer rubber, such as the inner tube material of a tire, or a fiber material such as nylon; the clamping block can use a harder rubber, such as the outer tube material of a tire.

[0067] The variable diameter mechanism design in the above embodiment realizes the flexible clamping of the clamp ring on the pipe pile. Whether it is directly clamped by driving the arc clamping block through the telescopic cylinder, or indirectly clamped by inflating the first flexible airbag, it can effectively adapt to pipe piles of different diameters, improving the applicability and flexibility of the device. This design simplifies the clamping operation of the pipe pile, improves the construction efficiency, and reduces the risk of damage to the surface of the pipe pile.

[0068] For this example, please refer to Figure 6 , a through area with a "U"-shaped cross section is provided in the extraction housing 30, and the clamping mechanism 7 includes:

[0069] A second flexible airbag 70 is provided in the cavity of the extraction housing 30 and the opening is toward the through-area. The second flexible airbag 70 is provided in the cavity. The surface of the second flexible airbag 70 facing the central area is provided with an arc-shaped clamping area 701 and a plane guide area 702. The shape of the second flexible airbag 70 is preset as follows: Figure 6 As shown, it is relatively soft when not pressurized, and can be deformed by squeezing. It becomes hard after pressurization, and clamps the pipe piles in the area;

[0070] The arc-shaped clamping area 701 is located inside the "U"-shaped opening of the extraction housing 30 and its central axis coincides with the axis of the clamping ring 21. The surface of the arc-shaped clamping area 701 is provided with an arc-shaped clamping block 601.

[0071] The plane guide area is located at one side of the "U"-shaped opening end of the pull-out shell 30, and includes plate-shaped guide blocks arranged opposite to the surface of the second flexible airbag 70. The two plate-shaped guide blocks are in a trumpet shape, and the guide blocks can be made of metal material.

[0072] Initially, the housing 30 can be removed as Figure 7As shown, it is not necessary to be higher than the pipe pile, but to be within the range of the pipe pile. By moving the carrier, the pipe pile is allowed to enter the "U"-shaped opening area of ​​the extraction housing 30 from the trumpet shape. Since the second flexible airbag 70 is not pressurized at this time, the second flexible airbag 70 can be deformed by properly squeezing it, so that the pipe pile enters the arc clamping area 701 accordingly. At this time, the second flexible airbag 70 is inflated and pressurized, and the arc clamping area 701 can clamp the pipe pile, and the opening shape of the plane guide area 702 can also limit the pipe pile from coming out. At this time, the loosening and twisting mechanism 2 moves downward to cover the pipe pile, and the twisting and pulling actions described above are performed.

[0073] The beneficial effects of the above embodiment are: first, the "U"-shaped opening design of the extraction shell 30 can be horizontally sleeved on the pipe pile without being inserted from top to bottom, so that the lifting stroke of the lifting structure connected to the loosening and twisting mechanism 2 can be reduced when the loosening and twisting mechanism 2 and the extraction mechanism 3 are inserted into the pipe pile; second, the second flexible airbag 70 clamps the pipe pile by air pressure, and the second flexible airbag 70 fills the entire extraction shell 30. When pulling out, the second flexible airbag 70 (extraction shell 30) first moves down, then inflates and hugs the pipe pile, and then the extraction shell 30 and the pipe pile are lifted upward by the retraction of the extraction cylinder 31. In this process, the inflated second flexible airbag 70 will also generate huge buoyancy, and lift the pipe pile upward together with the extraction cylinder 31. The two work together to reduce the load of the extraction cylinder 31 with the help of buoyancy, and can be pulled out without the help of large devices such as cranes.

[0074] In summary, the beneficial effects of this embodiment are remarkable: the "U"-shaped opening design is adopted to facilitate the horizontal insertion of the pipe pile, reduce the lifting stroke, improve the operation efficiency and simplify the mechanical complexity. The second flexible airbag clamps the pipe pile by air pressure and generates buoyancy during the extraction process, working in conjunction with the extraction cylinder to effectively reduce the load of the extraction cylinder, realize easy extraction without the assistance of a crane, reduce the difficulty of the operation, and enhance flexibility and applicability.

[0075] Furthermore, the surface of the arc-shaped clamping block 601 is provided with convex ridges 6011, and the axis of the convex ridges 6011 is parallel to the axis of the clamping ring 21, which can increase the clamping effect.

[0076] For this example, please refer to Figure 7-Figure 9 , and also includes a horizontal placement mechanism for changing the pulled-out pipe pile from a vertical state to a horizontal state. The horizontal placement mechanism includes a rail frame 41, a restriction ring 42 and a driver 43;

[0077] One end of the rail frame 41 is located in the area above the loosening and twisting mechanism 2, and the other end is connected to the inner side of the main body structure of the carrier 1. The area above the loosening and twisting mechanism 2 of the rail frame 41 is a straight section, and the straight section and the main body of the carrier 1 are connected by an inclined section. The rail frame 41 includes two rails located on both sides of the loosening and twisting mechanism 2, and a slide groove 411 is provided on the rails. The rails are supported and reinforced by a plurality of second brackets;

[0078] The inner ring surface size of the limiting ring 42 matches the pipe pile, and protruding sliding seats are respectively provided on both sides of the outer ring surface. The two sliding seats are respectively slidably matched with the sliding grooves 411 on the two side rails. The limiting ring 42 slides along the rail frame 41. The sliding seat can be set to be cylindrical, so that the limiting ring 42 can also turn around the axis of the sliding seat during the sliding process along the rail frame 41.

[0079] A limit frame 412 is provided at the end of the straight section, and the limit frame 412 limits the limit ring 42 at the end position of the straight section. At this time, the limit frame 412 coincides with the axis of the tight hoop 21, and the limit frame 412 is in contact with the limit ring 42. A hole is provided on the limit frame 412, and a matching protruding shaft 422 is provided on the limit ring 42.

[0080] The driver 43 is a winding motor disposed outside the limit frame 412. A cable is connected to the winding drum 433 of the winding motor. After the cable passes through the hole on the limit frame 412, it is fixedly connected to the protruding shaft 422. By controlling the length of the cable by the winding motor, the position of the limit ring 42 on the rail frame 41 can be controlled.

[0081] In the above embodiment, the main working principle is that when the bottom of the pipe pile has been completely pulled out of the lake bottom soil layer (but still in the water), and the top of the pipe pile has penetrated the limiting ring 42, the pipe pile can be tilted under the action of external force and fall down along the rail frame 41, and the winding motor controls the length of the cable to control the tilt angle of the pipe pile. In this process, the loosening and twisting mechanism 2 and the pulling mechanism 3 will also turn over with the pipe pile. It is precisely because the shell of the loosening and twisting mechanism 2 is rotatably connected with the matching ring 501 in the first bracket through the cylindrical rod 201 that the loosening and twisting mechanism 2 can turn over relative to the carrier body, thereby allowing the pipe pile to be placed horizontally.

[0082] Furthermore, the inner surface of the limiting ring 42 is also provided with a diameter-changing mechanism 6, so that piles of different diameters can be used. The vehicle 1 is composed of a plurality of pontoons 10, which are modular watertight boxes with multiple functions. The pontoons are provided with connecting devices on the four sides, and have good interchangeability. They can be combined into a variety of floating structures, such as floating docks, floating piers, water operation platforms, etc. In this embodiment, Figure 8 As shown, the pontoons 10 include two groups, and the two groups of pontoons 10 are connected by a connecting structure. The connecting structure is arranged at the bottom between the two groups of pontoons 10. A groove structure 12 is formed on the upper side of the connecting structure. The loosening mechanism 2 and the pulling mechanism 3 are arranged at the groove structure 12, and the horizontal placement mechanism is arranged above the groove structure 12.

[0083] During operation, the vehicle 1 (floating box 10) will have a certain draft depth, so the connection structure between the two groups of floating boxes will be located below the water surface, and there will be water in the groove structure 12. The pipe piles are pulled out while being placed horizontally, and will eventually be placed horizontally in the groove structure 12 without falling into the water. At the same time, the loosening and twisting mechanism 2 and the pulling mechanism 3 can be flipped back to their original state, and the limiting ring 42 can return to the initial position, so as to pull out the next pipe pile. At the same time, the pipe piles in the groove structure 12 are ready to be taken away. Not only does it realize the conversion of the pipe piles from vertical to horizontal, improving the operation efficiency and safety, but also the height of the entire pulling mechanism is reduced through a unique design. This improvement avoids the pulling mechanism from contacting the upper bridge or other structures during operation, reduces potential risks and damage, and further ensures the safety and smooth progress of construction. At the same time, the modular design of the pontoon enhances the flexibility and adaptability of the equipment, enabling the device to operate efficiently in a variety of complex water operation environments.

[0084] This embodiment is an embodiment of a method for removing pipe piles of a cofferdam of a cross-lake project, and is used in conjunction with the above-mentioned device for removing pipe piles of a cofferdam of a cross-lake project.

[0085] To understand this technical solution, please refer to Fig.10 When it is necessary to build a bridge across the lake or an underwater tunnel in the lake waters of the land area 92, it is necessary to carry out cofferdam construction first. Specifically, the construction area 90 needs to erect bridge piers or dig underground tunnels. Before the formal construction, the cofferdam construction is first carried out in the lake area 91, and two groups of pipe piles are inserted on both sides of the construction area 90. Reinforcement and waterproof structures are set between the two groups of pipe piles on both sides, and then earth or other core filling materials are filled to form the waterproof wall of the cofferdam; then the lake water between the pipe piles on both sides is drained to carry out the construction of bridge piers or tunnels. After the construction is completed and the structure is stable, a few pipe piles near the shore are first removed by a crane or other device, so that the lake water re-enters the original drained area (the original construction area 90). After the water level of the original construction area 90 is consistent with the water level of the lake area 91, the pipe pile removal operation is officially started. The pipe pile removal device is launched from the position where the pipe piles have been pulled out in advance, moves along the distribution line of the pipe piles and pulls them out one by one.

[0086] The following steps are involved:

[0087] In the initial state, the diameter-changing mechanism 6 in the loosening and twisting mechanism 2 maintains a large-diameter state, the extraction cylinder 31 of the extraction mechanism 3 is in a retracted state, the extraction housing 30 of the extraction mechanism 3 contacts the loosening and twisting mechanism 2, the clamping mechanism 7 in the extraction housing 30 is in a relaxed state, and the limiting ring 42 of the horizontal placement mechanism slides to the top of the loosening and twisting mechanism 2;

[0088] In the docking state, the carrier 1 adjusts its position so that the loosening and twisting mechanism 2 and the pulling mechanism 3 are located above the target pile, and the lifting structure drives the loosening and twisting housing 20 and the pulling mechanism 3 to move downward, so that the loosening and twisting mechanism 2 and the pulling mechanism 3 cover the top of the pile;

[0089] In the loosening state, the diameter reducing mechanism 6 of the loosening mechanism 2 reduces the inner diameter of the clamping ring 21 and clamps the pipe pile, and the loosening cylinder 22 reciprocates and drives the clamping ring 21 to twist back and forth, thereby driving the pipe pile to twist back and forth, and the fixed connection between the bottom of the pipe pile and the soil layer is loosened. The loosening mechanism flexibly adjusts the inner diameter of the clamping ring through the diameter reducing mechanism, effectively clamps the pipe pile, and cooperates with the reciprocating motion of the loosening cylinder to achieve the reciprocating twisting of the pipe pile, breaking the fixed connection between the bottom of the pipe pile and the soil layer, reducing the pulling force required for subsequent extraction, and reducing the damage to the bottom soil layer structure during extraction;

[0090] In the pulling-out state, the pulling-out cylinder 31 of the pulling-out mechanism 3 pushes the pulling-out shell 30 downward, the clamping mechanism 7 of the pulling-out shell 30 clamps the pipe pile, the reducing mechanism 6 of the loosening mechanism 2 increases the inner diameter of the clamping ring 21 and loosens the pipe pile, the pulling-out cylinder 31 of the pulling-out mechanism 3 pulls the pulling-out shell 30 upward and pulls the pipe pile out a certain distance, then the reducing mechanism 6 of the loosening mechanism 2 reduces the inner diameter of the clamping ring 21 and clamps the pipe pile, the clamping mechanism 7 of the pulling-out shell 30 loosens the pipe pile, and the pulling-out cylinder 31 of the pulling mechanism 3 pushes the pulling shell 30 downward to prepare for the next pulling-out, and the above pulling-out process is repeated. The pulling-out shell 30 is an empty shell with an airbag inside. The airbag pressurization can not only expand and clamp the pipe pile, but also use buoyancy to reduce the load of the pulling-out cylinder 31. The pulling-out mechanism uses the airbag as the clamping mechanism. The airbag design not only enhances the clamping flexibility but also reduces the load of the pulling cylinder 31, significantly improving construction efficiency and safety, and reducing energy consumption and operating difficulty;

[0091] In the horizontal state, the top of the pipe pile passes through the limiting ring 42, and after the bottom of the pipe pile leaves the lake bottom soil layer, the pipe pile begins to be tilted, and the driver 43 controls the sliding distance of the limiting ring 42 on the rail frame 41 through the cable, thereby controlling the tilting angle of the top of the pipe pile. The lower part of the pipe pile is controlled by the loosening and twisting mechanism 2 and the pulling mechanism 3. The loosening and twisting mechanism 2 and the pulling mechanism 3 tilt with the pipe pile, and the pipe pile is pulled out and tilted at the same time until all the pipe piles are pulled out and placed horizontally in the trench structure 12. The pulling out and horizontal placement of the pipe piles are cleverly integrated, and the sliding of the limiting ring is accurately controlled by the driver to achieve the smooth and oblique placement of the pipe piles into the trench structure. This design significantly reduces the working height, and is especially suitable for confined spaces such as under bridges, improving safety and efficiency. The horizontal placement process is smooth and controllable, and subsequent transportation is more convenient, which optimizes the construction process as a whole;

[0092] The piles are transported away, and a long-tube airbag is installed from the end of the pile and filled with gas to allow the piles to float. The cable is connected to the piles, and the cable is pulled from the shore to pull the piles out of the trench structure 12 and back to the shore for recovery. The innovative method of long-tube airbag and cable traction is adopted to achieve efficient transportation of piles from the carrier to the shore, without the need for a large transfer ship, saving costs and easy operation. This solution avoids the accumulation of piles on the pontoon carrier, making the carrier compact, flexible, and easy to assemble and disassemble, further reducing construction costs and improving overall construction efficiency and flexibility.

[0093] In summary, the present invention effectively overcomes various shortcomings in the prior art, can produce beneficial technical effects, and has significant progress.

[0094] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for removing pipe piles of cofferdams in a lake crossing project, characterized in that: It comprises a carrier (1), a loosening and twisting mechanism (2) and a pulling mechanism (3), wherein the carrier (1) floats on the water surface; The twist-releasing mechanism (2) comprises a twist-releasing shell (20), a clamping ring (21) and a twist-releasing cylinder (22); the twist-releasing shell (20) is connected to a side edge of the carrier (1) via a lifting structure; the clamping ring (21) is rotatably arranged in the twist-releasing shell (20); two ends of the twist-releasing cylinder (22) are respectively hinged to the inner wall of the twist-releasing shell (20) and the outer wall of the clamping ring (21); when the twist-releasing cylinder (22) reciprocates and retracts, it drives the clamping ring (21) to twist reciprocally; and a diameter-changing mechanism (6) is provided on the inner side of the clamping ring (21) for loosening or tightening the pipe pile; The pulling mechanism (3) comprises a pulling shell (30) and a pulling cylinder (31); the shell of the pulling cylinder (31) is fixedly connected to the loosening and twisting shell (20); the pulling shell (30) is arranged on the telescopic shaft of the pulling cylinder (31), and the telescopic direction is parallel to the axis of the clamping ring (21); a clamping mechanism (7) is arranged inside the pulling shell (30) for loosening or tightening the pipe pile; The clamping areas of the clamping mechanism (7) and the diameter reducing mechanism (6) are concentric; The lifting structure comprises a lifting cylinder (50) and a first bracket; The first bracket comprises two sub-brackets (51) arranged opposite to each other, and the twist-off housing (20) is located in the middle area between the two sub-brackets (51); A cylindrical rod (201) is provided at a contact position between the loose-twist housing (20) and the sub-bracket (51), and a lifting groove (511) is provided at a contact position between the sub-bracket (51) and the loose-twist housing (20), wherein the direction of the lifting groove (511) is parallel to the axis of the clamp ring (21); The lifting cylinder (50) is installed in the lifting groove (511), and a matching ring (501) is provided at the end of the output shaft of the lifting cylinder (50), and the cylindrical rod (201) on the loose-twist housing (20) is rotationally matched with the matching ring (501); It also includes a horizontal placement mechanism for changing the pulled-out pipe pile from a vertical state to a horizontal state; The horizontal placement mechanism comprises a rail frame (41), a restriction ring (42) and a driver (43); One end of the rail frame (41) is located in the area above the loosening and twisting mechanism (2), and the other end is connected to the inner side of the main body structure of the carrier (1); the area of ​​the rail frame (41) located above the loosening and twisting mechanism (2) is a straight section, and the straight section and the main body of the carrier (1) are connected via an inclined section; the rail frame (41) includes two rails located on both sides of the loosening and twisting mechanism (2), and slide grooves (411) are provided on the rails; The inner ring surface of the limiting ring (42) has a size matching that of the pipe pile, and protruding sliding seats are respectively provided on both sides of the outer ring surface, and the two sliding seats are respectively slidably matched with the sliding grooves (411) on the steel rails on both sides, and the limiting ring (42) slides along the steel rail frame (41); A limiting frame (412) is provided at the end of the straight section, the limiting frame (412) limiting the position of the limiting ring (42) at the end of the straight section, the limiting frame (412) being in contact with the limiting ring (42), the limiting frame (412) being provided with a hole, and the limiting ring (42) being provided with a matching protruding shaft (422); The driver (43) is a winding motor arranged outside the limiting frame (412); a cable is connected to the winding reel (433) of the winding motor; the cable passes through a hole on the limiting frame (412) and is fixedly connected to the protruding shaft (422).

2. A device for removing pipe piles of a cofferdam for a lake crossing project as claimed in claim 1, characterized in that: The diameter-changing mechanism (6) comprises: a cavity provided on the inner wall of the clamping ring (21), a telescopic cylinder installed in the cavity, the telescopic direction of the telescopic cylinder pointing along the radius to the center of the circle, and an arc-shaped clamping block (601) provided at the end of the telescopic shaft of the telescopic cylinder; Alternatively, the diameter-changing mechanism (6) comprises: a cavity provided on the inner wall of the tightening ring (21), a first flexible airbag (60) installed in the cavity, and an arc-shaped clamping block (601) provided on the surface of the first flexible airbag (60) facing the center of the circle.

3. The device for removing pipe piles of a cofferdam for a lake crossing project according to claim 1, characterized in that: A through-area with a U-shaped cross-section is provided in the extraction housing (30), and the clamping mechanism (7) comprises: A second flexible airbag (70) is disposed in the extraction housing (30) and has an opening facing a cavity in the penetration area, wherein a surface layer of the second flexible airbag (70) facing the central area is provided with an arc-shaped clamping area (701) and a plane guide area (702); The arc-shaped clamping area (701) is located inside the "U"-shaped opening of the extraction housing (30) and its central axis coincides with the axis of the clamping ring (21), and an arc-shaped clamping block (601) is provided on the surface of the arc-shaped clamping area (701); The planar guide area (702) is located on one side of the "U"-shaped opening end of the extraction shell (30), and comprises a plate-shaped guide block arranged opposite to the surface of the second flexible airbag (70), and the two plate-shaped guide blocks are in a trumpet shape.

4. A device for removing pipe piles of a cofferdam for a lake crossing project as claimed in claim 2 or 3, characterized in that: The surface layer of the arc-shaped clamping block (601) is provided with convex ridges (6011), and the axis of the convex ridges (6011) is parallel to the axis of the tightening ring (21).

5. The device for removing pipe piles of a cofferdam for a lake crossing project according to claim 1, characterized in that: The inner ring surface of the limiting ring (42) is also provided with the diameter-changing mechanism (6).

6. The device for removing pipe piles of a cofferdam for a lake crossing project according to claim 1, characterized in that: The vehicle (1) is formed by splicing a plurality of pontoons (10), wherein the pontoons (10) include two groups, and the two groups of pontoons (10) are connected via a connecting structure, wherein the connecting structure is arranged at the bottom between the two groups of pontoons (10), a groove structure (12) is formed on the upper side of the connecting structure, the loosening and twisting mechanism (2) and the pulling mechanism (3) are arranged at the groove structure (12), and the horizontal placement mechanism is arranged above the groove structure (12).

7. A method for removing pipe piles from a cofferdam of a lake crossing project, using a device for removing pipe piles from a cofferdam of a lake crossing project as claimed in claim 6, characterized in that: The following steps are involved: In the initial state, the diameter-changing mechanism (6) in the loosening and twisting mechanism (2) maintains a large-diameter state, the extraction cylinder (31) of the extraction mechanism (3) is in a retracted state, the extraction housing (30) of the extraction mechanism (3) is in contact with the loosening and twisting mechanism (2), the clamping mechanism (7) in the extraction housing (30) is in a relaxed state, and the limiting ring (42) of the horizontal placement mechanism slides to the top of the loosening and twisting mechanism (2); In the docking state, the carrier (1) adjusts its position, the loosening and twisting mechanism (2) and the pulling mechanism (3) are located above the target pipe pile, the lifting structure drives the loosening and twisting housing (20) and the pulling mechanism (3) to move downward, and the loosening and twisting mechanism (2) and the pulling mechanism (3) are sheathed on the top of the pipe pile; In the loosening state, the diameter reducing mechanism (6) of the loosening mechanism (2) reduces the inner diameter of the clamping ring (21) and clamps the pipe pile, and the loosening cylinder (22) reciprocates and drives the clamping ring (21) to twist reciprocally, thereby driving the pipe pile to twist reciprocally, and the fixed connection between the bottom of the pipe pile and the soil layer is loosened; In the pulling-out state, the pulling-out cylinder (31) of the pulling-out mechanism (3) pushes the pulling-out shell (30) to move downward, the clamping mechanism (7) of the pulling-out shell (30) clamps the pipe pile, the diameter-changing mechanism (6) of the loosening and twisting mechanism (2) increases the inner diameter of the clamping ring (21) and loosens the pipe pile, the pulling-out cylinder (31) of the pulling-out mechanism (3) pulls the pulling-out shell (30) upward and pulls the pipe pile out for a certain distance, then the diameter-changing mechanism (6) of the loosening and twisting mechanism (2) reduces the inner diameter of the clamping ring (21) and clamps the pipe pile, the clamping mechanism (7) of the pulling shell (30) loosens the pipe pile, the pulling-out cylinder (31) of the pulling mechanism (3) pushes the pulling shell (30) downward to prepare for the next pulling-out, and the above pulling-out process is repeated; In the horizontal state, the top of the pipe pile penetrates the limiting ring (42), and the bottom of the pipe pile is separated from the lake bottom soil layer, and the pipe pile begins to be tilted. The driver (43) controls the sliding distance of the limiting ring (42) on the rail frame (41) through the cable, thereby controlling the tilting angle of the top of the pipe pile. The lower part of the pipe pile is controlled by the loosening and twisting mechanism (2) and the pulling mechanism (3). The loosening and twisting mechanism (2) and the pulling mechanism (3) tilt with the pipe pile, and the pulling and tilting of the pipe pile are carried out simultaneously until the pipe pile is completely pulled out and placed horizontally in the trench structure (12); The pipe pile is transported away, a long tube air bag is installed from the end of the pipe pile and inflated with gas to allow the pipe pile to float, a cable is connected to the pipe pile, the cable is pulled from the shore, the pipe pile is pulled out of the trench structure (12) and pulled back to the shore for recovery.

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