Pile pulling and bottoming device and pile pulling equipment

Abstract

The invention provides a pile pulling and bottom supporting device and pile pulling equipment, the pile pulling and bottom supporting device comprises a sleeve box and at least one pile supporting part, the sleeve box is internally provided with a cavity used for enclosing a pile body and two end openings allowing the pile body to penetrate through, and the pile supporting part is arranged on the sleeve box in a sliding mode and penetrates through the cavity of the sleeve box; the pile supporting part is used for avoiding the pile body when the pile body penetrates through the sleeve box, and when the sleeve box is close to the bottom of the pile body, the pile supporting part slides to the bottom of the pile body to lift the pile body. The pile pulling and bottom supporting device is simplified in structure and convenient to operate, and the pile pulling efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of pile extraction technology in building engineering, and specifically relates to a pile extraction support device and pile extraction equipment. Background Technology

[0002] In recent years, with the continuous advancement of urbanization, the three-dimensional development and functional upgrading of urban spaces have placed higher demands on underground space. New high-rise buildings and shield tunnels for rail transit inevitably create spatial conflicts with older, previously constructed pile foundations. For example, during shield tunnel construction, if these deeply buried concrete piles, steel pipe piles, or precast square piles located along the track are not cleared and removed beforehand, it may lead to severe wear or even jamming of the tunnel boring machine's cutterhead, making the project impossible to continue. Addressing this issue after it occurs is not only time-consuming and labor-intensive but also affects the structural safety of the shield tunnel.

[0003] To address this challenge, the full-rotation, full-casing pile extraction technology has emerged. This technology uses a high-torque drilling rig to drive a steel casing for rotary cutting, completely encasing the existing pile before extraction. The resulting hole is then backfilled with soil or mortar. However, this technology relies on specialized high-torque equipment, customized casings (matching the pile diameter and soil hardness), and a matching grouting system. This results in low pile extraction efficiency and high investment per set of equipment, placing significant cost pressure on small and medium-sized construction companies. Summary of the Invention

[0004] This invention provides a pile extraction support device and a pile extraction equipment, which not only has a simplified structure and is easy to operate, but also improves the efficiency of pile extraction.

[0005] The technical solution of the present invention is as follows:

[0006] A pile-pulling and bottom-supporting device, comprising:

[0007] A casing, wherein the casing is provided with a cavity for enclosing the pile and openings at both ends for the pile to pass through;

[0008] At least one pile support is provided, which is slidably disposed on the sleeve and passes through the cavity of the sleeve. The pile support is used to avoid the pile when the pile passes through the sleeve, and to slide to the bottom of the pile to support the pile when the sleeve is close to the bottom of the pile.

[0009] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, the casing includes a first panel, a second panel, a third panel, and a fourth panel, which together form a quadrilateral structure. The first and second panels are located at both ends in the width direction of the casing, and the third and fourth panels are located at both ends in the length direction of the casing; and / or,

[0010] The cross-sectional shape of the sleeve box along the direction perpendicular to the height of the sleeve box is a trapezoidal structure, and the top dimension of the sleeve box is smaller than the bottom dimension of the sleeve box.

[0011] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, the pile-pulling and bottom-supporting device includes two parallel pile-supporting parts. Each end face of the sleeve along its width direction has two sliding grooves for sliding the pile-supporting parts. The two sliding grooves are inclined along the height direction of the sleeve and are relatively inclined to each other to form a figure-eight structure, so that the distance between the two pile-supporting parts gradually decreases from the top to the bottom of the sleeve; and / or,

[0012] The supporting pile part is a cylindrical structure; and / or...

[0013] Limiting plates are provided at both ends of the pile support, which are located on the outside of the sleeve to limit the pile support and prevent it from detaching from the sleeve.

[0014] Furthermore, the pile extraction and support device further includes:

[0015] The liquid inlet pipe is installed on the casing and leads to the cavity of the casing. It is used to connect with an external water tank or grouting equipment for flushing or grouting.

[0016] An air tube, which is installed on the casing and leads to the cavity of the casing, is used to connect to an external air compressor for inflation.

[0017] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, the liquid inlet pipe and the air pipe are disposed on the outer wall of one end of the casing along its length, with the liquid inlet pipe and the air pipe spaced apart; and / or,

[0018] The outer wall of the casing at one end along its length is provided with two through holes for the liquid inlet pipe and the air pipe to pass through; and / or,

[0019] The liquid inlet pipe and the gas pipe are welded to the casing.

[0020] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, protective components are respectively provided on the outer wall of the through hole of the sleeve through which the liquid inlet pipe and the air pipe pass, and the protective components are close to the bottom of the sleeve.

[0021] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, the protective component is an inverted trapezoidal structure, and the inclined surface of the inverted trapezoidal structure is close to the liquid inlet pipe or air pipe; and / or

[0022] The protective component is made of solid steel.

[0023] Furthermore, the pile extraction and support device also includes a lifting plate and a reinforcing plate. The lifting plate is located at the top of the casing and is used to connect with an external crane to lift the casing and the pile. The reinforcing plate is located at the top of the casing and is situated on one side of the lifting plate. The reinforcing plate is connected to the lifting plate, and a gap is provided between the lifting plate and the reinforcing plate for the pile to pass through.

[0024] Furthermore, in the aforementioned pile-pulling and bottom-supporting device, the reinforcing plate and the lifting plate are welded together; and / or,

[0025] The lifting plate and the reinforcing plate are respectively welded to the top of the casing; and / or,

[0026] The lifting plate is made of Larssen steel, and the reinforcing plate is made of steel plate; and / or,

[0027] The reinforcing plate has a triangular structure.

[0028] A pile extraction device, comprising:

[0029] The aforementioned pile-pulling and bottom-supporting device is used to support the bottom of the pile body;

[0030] A vibration device is used to apply vibration to the pile to disturb the soil around the pile.

[0031] A lifting device is connected to the top of the pile pulling and bottom support device to provide vertical pulling force.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention discloses a pile extraction and support device. By incorporating two gravity-sliding pile-supporting parts on a hollow internal casing, it lifts the bottom of the pile, avoiding the residual problems caused by pile breakage in full-rotation techniques and improving the efficiency of complete pile extraction. This pile extraction and support device not only has a simplified structure and is easy to operate, but also significantly reduces equipment and construction costs while improving economic efficiency, thus meeting the low-cost, high-efficiency needs of small and medium-sized construction enterprises.

[0034] This pile extraction and support device also incorporates a liquid inlet pipe and an air pipe. During the sinking phase, the combined action of water flushing and air flushing quickly disperses the soil around the pile and reduces frictional resistance, resulting in a faster sinking speed for the casing compared to fully rotating steel casings in similar strata (cohesive soil, sandy soil). For soft soil strata where the efficiency of fully rotating technology drops sharply, this device eliminates the need for high-torque cutting, achieving efficient sinking through water flushing and air flotation.

[0035] This pile extraction and support device simplifies the operation process and lowers the technical threshold. The device's casing, pile support section, liquid inlet pipe, air pipe, lifting plate, and reinforcing plate are connected by welding and other methods. Compared to full-rotation technology, which requires professional personnel to adjust drilling rig torque and grouting pressure, this device only requires a lifting device (such as a crane) and a vibration device (vibratory hammer). The core operation process can be mastered quickly, reducing reliance on highly skilled workers. During construction, there is no need to adjust complex parameters in real time; only the switching between flushing / grouting and the crane's lifting speed needs to be controlled, effectively reducing the risk of equipment damage or construction accidents caused by human error.

[0036] This pile extraction and support device significantly reduces equipment and construction costs, improving economic efficiency. Compared to the full-rotation full-casing pile extraction technology, which relies on high-torque specialized drilling rigs and customized steel casings costing millions of yuan, this device uses a casing, pile support section, liquid inlet pipe, and air pipe, eliminating the high cost of specialized equipment and meeting the low-cost needs of small and medium-sized enterprises. In terms of consumables, it eliminates the need for frequent replacement of the easily worn and expensive pipe shoes used in the full-rotation technology, and the liquid inlet pipe and air pipe are conventional steel pipelines, resulting in low procurement and maintenance costs. Attached Figure Description

[0037] Figure 1 This is a side view schematic diagram of a pile-pulling and bottom-supporting device according to the present invention;

[0038] Figure 2 This is a top view schematic diagram of the liquid inlet pipe and air pipe of a pile pulling and bottom supporting device according to the present invention;

[0039] Figure 3 This is a bottom view schematic diagram of a pile-pulling and bottom-supporting device according to the present invention.

[0040] In the diagram: 1. Sleeve; 2. Supporting pile; 3. Liquid inlet pipe; 4. Air pipe; 5. Lifting plate; 6. Reinforcing plate; 7. Protective component; 11. First panel; 12. Second panel; 13. Third panel; 14. Fourth panel; 15. Slide groove; 21. Limiting plate. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0042] like Figures 1-3 As shown, this embodiment provides a pile extraction and support device, including a housing 1 and at least one pile support part 2, and may also include a liquid inlet pipe 3 and an air pipe 4. Taking the extraction of a 300mm×300mm square pile as an example.

[0043] The sleeve 1 has a cavity for enclosing the pile and openings at both ends for the pile to pass through. The sleeve 1 may include a first panel 11, a second panel 12, a third panel 13, and a fourth panel 14, which together form a quadrilateral structure. The first panel 11 and the second panel 12 are located at both ends in the width direction of the sleeve 1, and the third panel 13 and the fourth panel 14 are located at both ends in the length direction of the sleeve 1. The first panel 11, the second panel 12, the third panel 13, and the fourth panel 14 are preferably made of Q235 hot-rolled steel plate with a thickness of 10mm.

[0044] Specifically, the first panel 11, the third panel 13, the second panel 12, and the fourth panel 14 are welded together in sequence to form a hollow quadrilateral structure. The internal cavity dimensions are 400mm × 400mm (50mm larger on each side than the pile body), and the length is 1m. The dimensions of the first panel 11 and the second panel 12 are larger than the dimensions of the third panel 13 and the fourth panel 14, so that the cross-sectional shape of the sleeve 1 along the direction perpendicular to the height of the sleeve 1 is a trapezoidal structure, and the top dimension of the sleeve 1 is smaller than the bottom dimension of the sleeve 1. Figure 1 In the diagram, the top of the sleeve 1 is the left end of the sleeve 1, and the bottom of the sleeve 1 is the right end of the sleeve 1. Two sliding grooves 15, each 55mm wide and 600mm long, can be opened on the first panel 11 and the second panel 12, respectively. The two sliding grooves 15 are inclined along the height direction of the sleeve 1 and have a figure-eight structure. Figure 1 In the figure, the height direction of the sleeve 1 is the left-right direction of the sleeve 1. Two through holes (not shown) with a diameter of 30mm can be opened on the third panel 13, and the through holes can be 50mm away from the bottom of the sleeve 1.

[0045] The pile support 2 is slidably mounted on the sleeve 1 and passes through the cavity of the sleeve 1. The pile support 2 is used to avoid the pile body when it passes through the sleeve 1, and to slide to the bottom of the pile body to support it when the sleeve 1 is close to the bottom of the pile body. The pile support 2 is preferably two cylinders with a diameter of 50mm, made of round steel. The length of the pile support 2 is 10mm longer than the width of the sleeve 1. The two ends of the pile support 2 pass through two symmetrically arranged sliding grooves 15 on the first panel 11 and the second panel 12, respectively, and slide in engagement with the sliding grooves 15. The body of the pile support 2 is located inside the cavity of the sleeve 1. The two pile support 2 are arranged parallel to each other between the first panel 11 and the second panel 12 of the sleeve 1. The two pile support 2 move from the top of the sleeve 1 to the bottom of the sleeve 1 along the two sliding grooves 15, so that the distance between the two pile support 2 gradually decreases. By setting two V-shaped sliding grooves 15 in the sleeve 1, the support of the pile body by the two pile support 2 is realized.

[0046] The inlet pipe 3 is installed on the casing 1 and leads to the cavity of the casing 1 for connection to an external water tank or grouting equipment. When the pile extraction and support device sinks, the inlet pipe 3 is connected to the water tank for flushing. When the pile extraction and support device lifts the pile, the inlet pipe 3 is connected to the grouting equipment for grouting.

[0047] The air pipe 4 is installed on the casing 1 and leads to the cavity of the casing 1 for connection to an external air compressor. When the pile pulling and supporting device sinks or pulls the pile, the air pipe is connected to the air compressor to provide air.

[0048] The lifting device is connected to the vibration device, which in turn is connected to the pile extraction and support device. During construction, the lifting device (such as an external crane) and the vibration device drive the housing 1 of the pile extraction and support device to sink. The pile extends from the bottom of the housing 1 into its cavity. The two pile support parts 2 are pressed by the pile and located at the ends of the two sliding grooves 15 near the top of the housing 1. When the housing 1 sinks to the bottom of the pile, the two pile support parts 2 are released from the pressure of the pile and slide down the two sliding grooves 15 towards the bottom of the housing 1. Because the two sliding grooves 15 have a V-shaped structure, the distance between the two pile support parts 2 gradually decreases during the descent. When the two pile support parts 2 slide down to the end of the sliding groove 15 near the bottom of the housing 1, they lift the bottom of the pile. The lifting device then drives the pile extraction and support device to pull out the pile. During the sinking process of the pile extraction support device, the liquid inlet pipe 3 is connected to the water tank to flush the soil around the pile with water, and the air pipe 4 is connected to the air compressor to inflate the soil around the pile, allowing the sleeve 1 to sink smoothly to the bottom of the pile. During the lifting process of the pile, the liquid inlet pipe 3 is connected to the grouting equipment to inject cement grout into the soil voids during the pile lifting process. At the same time, the air pipe 4 inflates the cement grout, allowing the cement grout to fill the soil voids after pile extraction, ensuring the compactness of the soil after pile extraction. The external dimensions, strength, and rigidity parameters of the pile extraction support device can be determined based on the shape, size, and depth of the pile to be extracted.

[0049] In the aforementioned structure, two gravity-sliding pile-supporting parts 2 are installed on the hollow inner casing 1, which lifts the bottom of the pile. This avoids the residual problems caused by pile breakage in full-rotation technology and improves the efficiency of complete pile extraction. This pile extraction and support device not only has a simplified structure but is also easy to operate. It improves construction efficiency while significantly reducing equipment and construction costs, enhancing economic efficiency, and meeting the low-cost, high-efficiency needs of small and medium-sized construction enterprises.

[0050] like Figure 1 and Figure 3As shown, in a preferred embodiment, the two ends of the support pile 2 are provided with limiting plates 21. The limiting plates 21 are located on the outside of the sleeve 1 and are used to limit the support pile 2 and prevent it from detaching from the sleeve 1. The limiting plate 21 is preferably a circular end plate with a thickness of 20mm and a diameter of 80mm, and the welding height between the end plate and the support pile 2 is not less than 8mm. During assembly of the support pile 2, both ends of the support pile 2 can be passed through the sliding groove 15 first, then the limiting plate 21 at one end of the support pile 2 is welded first, and then the limiting plate 21 at the other end of the support pile 2 is welded. The setting of the limiting plates 21 can effectively prevent the support pile 2 from detaching from the sleeve 1, ensuring the lifting effect.

[0051] like Figure 1 and Figure 2 As shown, in a preferred embodiment, the inlet pipe 3 can be welded onto the outer wall of the third panel 13 of the casing 1 and leads into the cavity of the casing 1 for connection to an external water tank or grouting equipment to flush water into the soil around the pile or to inject grout into the hole after the pile is pulled out. The inlet pipe 3 is preferably a seamless steel pipe with a diameter of 25mm (pressure resistance ≥10MPa). One end of the inlet pipe 3 is connected to an external water pipe / grouting equipment, and the other end of the inlet pipe 3 passes through a through hole on the third panel 13. The length extending into the inner cavity of the casing 1 can be set to 10mm to avoid interfering with the pile. The connection between the inlet pipe 3 and the through hole is plug-welded.

[0052] Furthermore, the air pipe 4 can be welded onto the outer wall of the third panel 13 of the casing 1 and leads into the cavity of the casing 1 for connection to an external air compressor to inflate the soil around the pile. The air pipe 4 and the liquid inlet pipe 3 are spaced apart. The air pipe 4 is preferably a seamless steel pipe with a diameter of 25mm (pressure resistance rating ≥10MPa). The pipe body of the air pipe 4 that contacts the third panel 13 is welded to the third panel 13. One end of the air pipe 4 is connected to the external air compressor, and the other end of the air pipe 4 passes through the through hole on the third panel 13. The length of the air pipe 4 extending into the inner cavity of the casing 1 can be set to 10mm to avoid interfering with the pile. The connection between the air pipe 4 and the through hole is plug-welded.

[0053] Specifically, when the lifting mechanism and vibration device drive the casing 1 to sink, the water tank injects water into the inlet pipe 3, causing the inlet pipe 3 to flush water into the soil, breaking up the soil and assisting the casing 1 to sink. At the same time, the air compressor inflates the air pipe 4, causing the air pipe 4 to inflate the soil, breaking up the soil and reducing friction between the casing 1 and the soil. When the casing 1 sinks to the bottom of the pile and the two pile support parts 2 are located at the bottom of the pile, the lifting mechanism drives the casing 1 to lift the pile with the two pile support parts 2. At the same time, the grouting equipment injects grout into the inlet pipe 3, causing the inlet pipe 3 to fill the voids in the soil after the pile is pulled out with cement grout. Simultaneously, the air pipe 4 inflates the voids, flushing the cement grout from the inlet pipe 3 into the voids in the soil, ensuring the compactness of the soil filling after the pile is pulled out.

[0054] The liquid inlet pipe 3 scours and softens the soil surrounding the pile, weakening the embedment between the pile and the soil, thereby improving pile extraction efficiency. It also fills the voids in the soil after the pile is extracted. The air pipe 4 disturbs the soil surrounding the pile, reducing the frictional resistance of the soil against the casing 1. It also injects cement grout into the soil voids, increasing the density of the void filling. During the sinking stage, the combined action of water and air flushing quickly disperses the soil around the pile and reduces frictional resistance, making the sinking speed of casing 1 faster than that of a full-rotation steel casing in similar strata (cohesive soil, sandy soil). For soft soil strata where the efficiency of full-rotation technology drops sharply, this device does not rely on high-torque cutting; it achieves efficient sinking through water flushing and air flotation.

[0055] like Figures 1-3 As shown, in a preferred embodiment, protective components 7 are respectively provided on the outer wall of the through hole of the sleeve 1 through which the liquid inlet pipe 3 and the air pipe 4 pass, and the protective components 7 are close to the bottom of the sleeve 1. The protective component 7 can preferably be a solid steel body with an inverted trapezoidal structure, and the inclined surface of the inverted trapezoidal structure is close to the liquid inlet pipe 3 or the air pipe 4. During the sinking process of the bottom support device, it is easy to encounter hard obstacles (such as stones), which can damage or deform the bends of the liquid inlet pipe 3 or the air pipe 4. The setting of the protective component 7 facilitates the protection of the bends of the liquid inlet pipe 3 and the air pipe 4, improves the service life of the device, and ensures the normal progress of construction.

[0056] like Figure 1 and Figure 2 As shown, in a preferred embodiment, the pile pulling and bottom support device further includes a lifting plate 5, which is disposed on the top of the casing 1 and is used to connect with an external crane to lift the casing 1 and the pile body.

[0057] Specifically, the lifting plate 5 is vertically positioned on top of the casing 1 and welded to the top of the casing 1, with a weld leg size of not less than 8mm. The lifting plate 5 is preferably a Type III Larssen steel plate, with a width of 400mm. The specifications of the lifting plate 5 can be determined based on the external dimensions and depth of the pile being extracted, generally 100mm larger than the external dimensions of the pile. The lifting device is connected to the top of the lifting plate 5, driving the lifting plate 5 to lift the casing 1 and the two pile support parts 2. The lifting plate 5 provides vertical lifting force to the device, thereby improving pile extraction efficiency.

[0058] like Figure 1 As shown, the pile pulling and bottom support device further includes a reinforcing plate 6, which is disposed on the top of the sleeve 1 and located on one side of the lifting plate 5. The reinforcing plate 6 is connected to the lifting plate 5, and a gap is provided between the lifting plate 5 and the reinforcing plate 6 for the pile body to pass through.

[0059] Specifically, the number of reinforcing plates 6 is preferably two 10mm thick stiffening steel plates, and the reinforcing plates 6 can preferably be steel plates with a right-angled triangular structure. The two reinforcing plates are located on both sides of the connection between the lifting plate and the sleeve box. One side of the right-angle end of the reinforcing plate 6 is welded to the side of the lifting plate 5, and the other side of the right-angle end of the reinforcing plate 6 is welded to the top of the sleeve box 1.

[0060] The reinforcement plate 6 enhances the shear stiffness and strength at the connection between the lifting plate 5 and the sleeve 1, improving the stability of the device and thus ensuring the safety and continuity of the pile extraction operation.

[0061] like Figure 1 As shown, this embodiment also provides a pile extraction device, including a pile extraction support device, a vibration device (not shown), and a lifting device (not shown). The pile extraction device also includes an air compressor, a water tank, a grout storage tank, grouting equipment, and other supporting devices. The lifting device is connected to the vibration device, and the vibration device is connected to the pile extraction support device. The pile extraction support device is used to support the bottom of the pile. The vibration device is used to apply vibration to the pile to disturb the soil around the pile. The vibration device can preferably be a vibratory hammer. The lifting device is used to provide vertical extraction force. The lifting device can preferably be a crane.

[0062] The lifting device and the vibration device drive the pile extraction and support device to sink. The vibration device disturbs the soil around the pile to reduce the resistance around the pile, so that the sleeve 1 and the two pile support parts 2 sink to the bottom of the pile and lift the bottom of the pile. When the two pile support parts 2 lift the pile base into place, the lifting device drives the pile extraction and support device to move upward and pull out the pile.

[0063] In the aforementioned structure, the efficient and complete extraction of the pile is achieved through the coordinated use of a pile extraction support device, a vibration device, and a lifting device. This pile extraction equipment integrates functions such as vibratory water jetting to reduce drag, bottom support, top lifting, and backfilling, significantly reducing pile extraction resistance and equipment load. While improving pile extraction efficiency, it also takes into account construction safety and economy.

[0064] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A pile-pulling and bottom-supporting device, characterized in that, include: The sleeve (1) is provided with a cavity for enclosing the pile body and openings at both ends for the pile body to pass through. At least one pile support (2) is slidably disposed on the sleeve (1) and passes through the cavity of the sleeve (1). The pile support (2) is used to avoid the pile body when the pile body passes through the sleeve (1) and to slide to the bottom of the pile body to support the pile body when the sleeve (1) is close to the bottom of the pile body.

2. The pile-pulling and bottom-supporting device as described in claim 1, characterized in that, The sleeve (1) includes a first panel (11), a second panel (12), a third panel (13), and a fourth panel (14). The first panel (11), second panel (12), third panel (13), and fourth panel (14) form a quadrilateral structure. The first panel (11) and second panel (12) are located at both ends in the width direction of the sleeve (1), and the third panel (13) and fourth panel (14) are located at both ends in the length direction of the sleeve (1); and / or, The cross-sectional shape of the sleeve (1) along the direction perpendicular to the height of the sleeve (1) is a trapezoidal structure, and the top dimension of the sleeve (1) is smaller than the bottom dimension of the sleeve (1).

3. The pile-pulling and bottom-supporting device as described in claim 1, characterized in that, The pile-pulling and bottom-supporting device includes two parallel pile-supporting parts (2). Two sliding grooves (15) for sliding the pile-supporting parts (2) are respectively opened on each end face of the sleeve (1) along its width direction. The two sliding grooves (15) are inclined along the height direction of the sleeve (1) and are relatively inclined to form a figure-eight structure, so that the distance between the two pile-supporting parts (2) gradually decreases from the top to the bottom of the sleeve (1); and / or, The support pile (2) is a cylindrical structure; and / or, Limiting plates (21) are provided at both ends of the pile support part (2). The limiting plates (21) are located on the outside of the sleeve (1) and are used to limit the pile support part (2) and prevent the pile support part (2) from falling out of the sleeve (1).

4. The pile-pulling and bottom-supporting device as described in claim 1, characterized in that, The pile-pulling and bottom-supporting device also includes: Liquid inlet pipe (3) is installed on the casing (1) and leads to the cavity of the casing (1) for connection with an external water tank or grouting equipment for flushing or grouting. Air pipe (4), which is installed on the casing (1) and leads to the cavity of the casing (1), is used to connect with an external air compressor for inflation.

5. The pile-pulling and bottom-supporting device as described in claim 4, characterized in that, The liquid inlet pipe (3) and the air pipe (4) are disposed on the outer wall of one end of the sleeve (1) along the length direction, and the liquid inlet pipe (3) and the air pipe (4) are spaced apart; and / or, The outer wall of the sleeve (1) at one end along its length is provided with two through holes for the liquid inlet pipe (3) and the air pipe (4) to pass through; and / or, The liquid inlet pipe (3) and the air pipe (4) are welded to the casing (1).

6. The pile-pulling and bottom-supporting device as described in claim 5, characterized in that, The outer wall of the sleeve (1) through the through hole through which the liquid inlet pipe (3) and the air pipe (4) pass is provided with protective components (7), which are located near the bottom of the sleeve (1).

7. The pile-pulling and bottom-supporting device as described in claim 6, characterized in that, The protective component (7) has an inverted trapezoidal structure, and the inclined surface of the inverted trapezoidal structure is close to the liquid inlet pipe (3) or the air pipe (4); and / or The protective component (7) is a solid steel body.

8. The pile-pulling and bottom-supporting device as described in claim 1, characterized in that, It also includes a lifting plate (5) and a reinforcing plate (6). The lifting plate (5) is located on the top of the casing (1) and is used to connect with an external crane to lift the casing (1) and the pile. The reinforcing plate (6) is located on the top of the casing (1) and is located on one side of the lifting plate (5). The reinforcing plate (6) is connected to the lifting plate (5). A gap is provided between the lifting plate (5) and the reinforcing plate (6) for the pile to pass through.

9. The pile-pulling and bottom-supporting device as described in claim 8, characterized in that, The reinforcing plate (6) and the lifting plate (5) are welded together; and / or, The lifting plate (5) and the reinforcing plate (6) are respectively welded to the top of the sleeve (1); and / or, The lifting plate (5) is a Larssen steel plate, and the reinforcing plate (6) is a steel plate; and / or, The reinforcing plate (6) has a triangular structure.

10. A pile extraction device, characterized in that, include: The pile-pulling and bottom-supporting device as described in any one of claims 1-9 is used to support the bottom of the pile body; A vibration device is used to apply vibration to the pile to disturb the soil around the pile. A lifting device is connected to the top of the pile pulling and bottom support device to provide vertical pulling force.

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