Small diameter quick pile extraction device and use method thereof

Abstract

The present invention discloses a small-diameter quick pile pulling device and a method for using the same. The pile pulling device includes a base with a pile pulling hole, a clamping mechanism and a hydraulic drive mechanism; the clamping mechanism includes a first and a second annular seats, a lifting mechanism, a first clamping assembly and a second clamping assembly arranged in the two annular seats, and the hydraulic drive mechanism includes a hydraulic cylinder, a hydraulic push rod and a hydraulic oil pipeline. The hydraulic cylinder is divided into an upper hydraulic oil chamber, an air chamber, a middle hydraulic oil chamber and a lower hydraulic oil chamber from top to bottom through three piston plates. The middle hydraulic oil chamber provides hydraulic oil to the upper second clamping assembly through the first connecting pipe, the upper hydraulic oil chamber provides hydraulic oil to the lower first clamping assembly through the second connecting pipe, and the lower hydraulic oil chamber provides hydraulic oil to the piston-type lifting mechanism through the third connecting pipe. The present invention only needs to control the hydraulic push rod to achieve pile pulling, thereby avoiding a complex hydraulic system and improving the practicality of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of pile pulling, and in particular to a small-diameter quick pile pulling device and a use method thereof. Background Art

[0002] Pile foundations are pillars used to support buildings. Usually, the piles are cast underground. After the building is demolished, the pile foundations also need to be removed. When removing some smaller diameter pile foundations, it is expensive to use large equipment. Therefore, a small diameter quick pile extraction device is needed.

[0003] In the prior art, a general pile pulling device requires a complex lifting system during use to ensure that the pile foundation can be lifted periodically to complete the pulling work. In addition, in most hydraulic systems, various valves are required, and various operations on the valves can be performed to achieve the pulling work of the pile foundation, which has low practicality. Summary of the invention

[0004] The object of the present invention is to provide a small-diameter quick pile pulling device and a use method thereof, so as to solve the technical problems in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a small-diameter quick pile pulling device, which includes a base, a clamping mechanism and a hydraulic drive mechanism. A pile pulling hole is opened on the base, and the clamping mechanism is erected above the pile pulling hole through a support plate;

[0006] The clamping mechanism comprises a first annular seat, a second annular seat, a lifting mechanism, a first clamping assembly arranged in the first annular seat and a second clamping assembly arranged on the second annular seat, the second annular seat and the first annular seat are vertically and parallelly distributed directly above the base, and the hollow areas of the two annular seats are directly opposite to the pile pulling holes, the first annular seat and the second annular seat are slidably connected by a plurality of connecting rods, the lower end of each connecting rod is fixed on the first annular seat, and the upper end is slidably connected to the second annular seat; the lifting mechanism is a piston-type lifting mechanism, the bottom of its piston sleeve is fixed on the base, and the top of the piston rod is fixed on the second annular seat; the first clamping assembly and the second clamping assembly each comprise a plurality of piston-type clamping heads distributed along the corresponding annular seats, and the clamping end of each piston-type clamping head is placed in the annular seat, and its clamping surface faces the center position of the annular seat;

[0007] The hydraulic drive mechanism includes a hydraulic cylinder, a hydraulic push rod and a hydraulic oil pipeline. A first piston plate and two second piston plates are arranged in the hydraulic cylinder from top to bottom. The three piston plates divide the hydraulic cylinder into an upper hydraulic oil chamber, an air chamber, a middle hydraulic oil chamber and a lower hydraulic oil chamber from top to bottom. The first piston plate is connected to the upper second piston plate through a piston-type connecting piece, the two second piston plates are connected through a spring, and the bottom of the lower second piston plate is connected to the bottom surface of the hydraulic cylinder through a damping telescopic rod; the hydraulic push rod extends into the upper hydraulic oil chamber of the hydraulic cylinder and is connected to the first piston plate; the hydraulic oil pipeline includes a first connecting pipe connecting the middle hydraulic oil chamber with multiple piston-type clamping heads of the upper second clamping assembly, a second connecting pipe connecting the upper hydraulic oil chamber with multiple piston-type clamping heads of the lower first clamping assembly, and a third connecting pipe connecting the lower hydraulic oil chamber with the piston-type lifting mechanism, and hydraulic oil is provided to the multiple piston-type clamping heads and the piston lifting mechanism respectively through the hydraulic oil pipeline.

[0008] The preferred technical solution of the present invention is as follows: the piston-type lifting mechanism is provided with two groups, which are symmetrically arranged on both sides of the first annular seat and the second annular seat; each group of piston-type lifting mechanism includes a first piston sleeve, a first piston block and a first piston rod, the first piston sleeve is vertically arranged on the top of the base, the first piston block is slidably embedded in the first piston sleeve, and the first piston sleeve is divided into two piston chambers, the lower end of the first piston rod is connected to the top of the first piston block, and the upper end is connected to the second annular seat on the upper layer through a connecting block; the hydraulic drive mechanism simultaneously provides hydraulic power to the first piston blocks of the two groups of piston-type lifting mechanisms, driving the first piston rod to move upward in the first piston sleeve, thereby driving the second annular seat to rise along the connecting rod.

[0009] The preferred technical solution of the present invention is as follows: the connection between the hydraulic push rod and the hydraulic cylinder is sealed, and the hydraulic push rod drives the first piston plate to move in the hydraulic cylinder; the telescopic end of the damping telescopic rod is fixedly connected to the bottom of the lower second piston plate, and the lower end of the damping telescopic rod is connected to the bottom surface of the hydraulic cylinder; the piston-type connecting part includes a third piston sleeve, a third piston block and a third piston rod. The third piston sleeve is a cylinder structure with one end closed, and the barrel mouth of the third piston sleeve is fixed to the bottom of the upper second piston plate. The third piston block is slidably embedded in the third piston sleeve and divides the third piston sleeve into two upper and lower cavities. The cavity below the third piston block is filled with air, one end of the third piston rod is fixed to the bottom of the first piston plate, and the other end passes through the upper second piston plate and extends into the third piston sleeve from the barrel mouth of the third piston sleeve and is connected to the third piston block.

[0010] The preferred technical solution of the present invention is as follows: the multiple piston-type clamping heads of each clamping assembly are equidistantly distributed in a ring shape on the corresponding annular seat; each piston-type clamping head includes a second piston sleeve, a second piston block, a second piston rod and a rubber clamping head; a plurality of mounting holes are correspondingly provided on the annular surface of each annular seat; the second piston sleeve is penetrated in the mounting hole of the corresponding annular seat side wall; the second piston block is slidably embedded in the second piston sleeve and divides the second piston sleeve into two piston chambers; one end of the second piston rod is connected to the end face of the second piston block adjacent to the inner ring of the annular seat, and the other end extends out of the second piston sleeve and is connected to the rubber clamping head; the hydraulic drive mechanism provides hydraulic power for the second piston block, pushes the second piston rod to drive the rubber clamping head to move toward the center position of the annular seat, and clamps the pile body placed in the annular seat.

[0011] The preferred technical solution of the present invention is as follows: the base is a circular base, and a plurality of support plates are dispersedly arranged around the pile pulling hole, and the first annular seat is arranged on the top of the support plate; a fixing plate is provided on the side of the base, and the hydraulic cylinder is fixedly installed on the fixing plate, and its bottom surface is sealed by the fixing plate.

[0012] The preferred technical solution of the present invention is as follows: multiple connecting rods are equidistantly distributed along the first annular seat, and multiple connecting holes are correspondingly opened on the first annular seat and the second annular seat. The lower end of each connecting rod is fixed in the connecting hole of the first annular seat, and the upper end is slidably connected to the corresponding connecting hole on the second annular seat. The connected second annular seat slides up and down along the multiple connecting rods, and a limiting component is provided at the top of the connecting rod.

[0013] A further technical solution of the present invention: the hydraulic oil pipeline also includes an upper annular tube and a lower annular tube, the upper annular tube is sleeved on the outer ring of the second annular seat, and is respectively connected with the rodless chambers of the second piston sleeves of the multiple piston-type clamping heads on the second annular seat away from the clamping end, the lower annular tube is sleeved on the outer ring of the first annular seat, and is respectively connected with the rodless chambers of the second piston sleeves of the multiple piston-type clamping heads on the first annular seat away from the clamping end; one end of the first connecting tube is connected with the upper annular tube, and the other end extends into the hydraulic cylinder from the bottom of the hydraulic cylinder, and passes through the lower second piston plate through a hose to the middle hydraulic oil chamber between the two layers of the second piston plates; one end of the second connecting tube is connected with the lower annular tube, and the other end leads from the top of the hydraulic cylinder to the upper hydraulic oil chamber in the hydraulic cylinder located above the first piston plate; the third connecting tube is a three-way tube, which is arranged at the bottom of the hydraulic cylinder, one end of which leads to the lower hydraulic oil chamber of the hydraulic cylinder located below the lower second piston plate, and the other two ends are respectively connected with the rodless chambers at the lower ends of the first piston sleeves of the two groups of piston-type lifting mechanisms.

[0014] A further technical solution of the present invention is as follows: the upper hydraulic oil chamber, the middle hydraulic oil chamber and the lower hydraulic oil chamber are all filled with hydraulic oil, and no hydraulic oil is injected into the air chamber; the second connecting pipe, the hose, the first connecting pipe, the three-way pipe, the upper annular pipe and the lower annular pipe are all filled with hydraulic oil, the first piston sleeve is filled with hydraulic oil at a position below the first piston block, and the second piston sleeve is filled with hydraulic oil at one side of the second piston block and away from the rubber clamping head, and the entire hydraulic system is in a sealed state.

[0015] The present invention also provides a method for using the small-diameter quick pile pulling device, which specifically comprises the following steps:

[0016] Step 1: Place the base on the pile body, and place the pile body to be pulled out in the pile pulling hole of the base, turn on the switch of the hydraulic push rod, and drive the first piston plate to descend through the hydraulic push rod. During the descending process of the first piston plate, the second piston plate is kept stationary through the piston-type connecting piece between the first piston plate and the upper second piston plate, and the first piston plate is close to the upper second piston plate;

[0017] Step 2: When the piston-type connector is fully retracted, the first piston plate contacts the upper second piston plate and continues to push the upper second piston plate downward. At this time, under the action of the damping telescopic rod, the two second piston plates approach each other and compress the spring. After the two second piston plates approach each other, the hydraulic oil in the hydraulic oil chamber between the two second piston plates enters each piston-type clamping head in the second clamping assembly on the upper second annular seat through the first connecting pipe;

[0018] Step 3: When the hydraulic oil enters each piston clamping head in the second clamping assembly, it will squeeze the multiple piston clamping heads of the second clamping assembly to clamp and fix the pile body to be pulled at the same time;

[0019] Step 4: As the hydraulic push rod continues to press down, the upper second piston plate and the lower second piston plate are squeezed to the limit, which will push the lower second piston plate down, causing the damping telescopic rod to contract, and the hydraulic oil in the lower hydraulic oil chamber below the second piston plate in the hydraulic cylinder enters the piston lifting mechanism through the third connecting pipe, driving the piston lifting mechanism to drive the upper second annular seat to rise along the connecting rod, which will drive the clamped pile body to rise as a whole, thereby realizing the lifting of the pile body;

[0020] Step 5: When the second annular seat rises to the uppermost end of the connecting rod, the hydraulic push rod is controlled to contract, driving the first piston plate to rise. In the initial stage of the rise, under the action of the piston-type connecting member, the upper second piston plate does not move. When the first piston plate rises, the hydraulic oil in the upper hydraulic oil chamber above the first piston plate in the hydraulic cylinder is input into the first clamping assembly on the lower first annular seat through the second connecting pipe, thereby fixing the pile body.

[0021] Step 6: When the first piston plate rises until the air cavity returns to its original position, the upper second piston plate is driven to rise. Under the action of the spring and the damping telescopic rod, the two second piston plates are separated, so that the second clamping assembly on the second annular seat releases the pile body;

[0022] Step seven: When the upper second piston plate rises until the spring returns to its original position, it will drive the lower second piston plate to rise. During the rising process of the lower second piston plate, the hydraulic oil in the piston lifting mechanism returns to the lower hydraulic oil chamber through the three-way pipe, and the piston rod of the piston lifting mechanism descends, driving the upper second annular seat to descend along the connecting rod and return to its original position; the hydraulic push rod can be pressed down again to realize the pulling out of the pile body.

[0023] The present invention is provided with two upper and lower annular seats and a hydraulic driving mechanism. The two annular seats are slidably connected by a connecting rod. A clamping mechanism is arranged in each of the two annular seats. The hydraulic driving mechanism is connected with the clamping mechanisms on the two annular seats through different hydraulic pipelines respectively, and the clamping mechanisms on the two annular seats are individually controlled to clamp the pile body in the annular seats; the hydraulic driving mechanism comprises a hydraulic push rod, a first piston plate, a second piston plate, a damping telescopic rod, a spring and a connecting assembly. The first piston plate is driven to descend by the hydraulic push rod. During the descending process of the first piston plate, the air in the third piston sleeve is compressed by the third piston rod and the third piston block. When the air cannot be compressed, the third piston rod and the third piston block are used. A piston plate contacts the second piston plate and pushes the second piston plate to move. At this time, under the action of the damping telescopic rod, the two second piston plates approach each other and compress the spring. After the two second piston plates approach each other, the hydraulic oil between the two second piston plates enters the clamping mechanism on the upper second annular seat to fix the pile body. As the hydraulic push rod continues to work, the second piston plate descends, causing the damping telescopic rod to contract, and the hydraulic oil under the second piston plate in the hydraulic cylinder enters the first piston sleeve through the three-way pipe. The hydraulic oil and the first piston plate push the first piston rod to rise. Under the action of the connecting rod, the first annular seat and the second annular seat are separated to achieve the lifting of the pile body.

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

[0025] The invention only needs to control the hydraulic push rod during the pile pulling process, and can respectively realize the process of repeatedly fixing and pulling out the pile body through a set of hydraulic drive system, thereby avoiding a complex hydraulic system and improving the practicality of the entire device; and the invention can fix the pile body during the pile pulling process to ensure its stability, and the entire pile pulling process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the first piston sleeve and the first piston rod of the present invention;

[0028] Figure 3 is a schematic diagram of the connection between the first annular seat and the second annular seat of the present invention;

[0029] Figure 4 It is a schematic diagram of the explosion structure of the second piston sleeve, the second piston rod and the second piston block of the present invention;

[0030] Figure 5 It is a schematic diagram of the explosion structure of the first piston sleeve, the first piston rod and the first piston block of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the hydraulic cylinder, the first connecting pipe, the second connecting pipe and the three-way pipe of the present invention;

[0032] Figure 7 It is a schematic diagram of the cross-sectional structure of the hydraulic cylinder of the present invention;

[0033] Figure 8 is a schematic diagram of the first piston plate in the hydraulic cylinder initially contacting the second piston plate in the present invention;

[0034] Fig. 9 It is a schematic diagram of the exploded structure of the connection assembly of the present invention.

[0035] 1. Base; 100. Pile pulling hole; 101. Support plate; 2. First annular seat; 3. Second annular seat; 4. Connecting rod; 5. Fixed plate; 6. Hydraulic cylinder; 600. Upper hydraulic oil chamber; 601. Air chamber; 602. Middle hydraulic oil chamber; 603. Lower hydraulic oil chamber; 7. Hydraulic push rod; 8. Upper annular tube; 9. First piston sleeve; 10. First piston rod; 11. Connecting block; 12. Second piston sleeve; 13. Second piston block; 14. Second piston rod; 15. Rubber clamping head; 16. Connecting hole; 17. First connecting tube; 18. First piston block; 19. Three-way tube; 20. Second connecting tube; 21. First piston plate; 22. Second piston plate; 23. Spring; 24. Damping telescopic rod; 25. Hose; 26. Third piston sleeve; 27. Third piston block; 28. Third piston rod; 29. ​​Lower annular tube. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiment 1 provides a small diameter quick pile pulling device, such as Figures 1 to 9 As shown, it includes a base 1, a clamping mechanism and a hydraulic drive mechanism; the base 1 is a circular base, a pile pulling hole 100 is opened on the base 1, a plurality of support plates 101 are dispersedly arranged around the pile pulling hole 100, and the clamping mechanism is arranged on the top of the support plate 101;

[0041] The clamping mechanism includes a first annular seat 2, a second annular seat 3, a lifting mechanism, a first clamping assembly arranged in the first annular seat 2, and a second clamping assembly arranged on the second annular seat 3. The second annular seat 3 and the first annular seat 2 are arranged vertically and parallelly above the base 1, and the hollow areas of the two annular seats correspond to the pile extraction holes 100. The lower first annular seat 2 is connected to a plurality of support plates 101. Figure 3As shown, the first annular seat 2 and the second annular seat 3 are slidably connected by a plurality of connecting rods 4, which are evenly distributed along the annular seat. A plurality of connecting holes 16 are correspondingly opened on the first annular seat 2 and the second annular seat 3. The lower end of each connecting rod 4 is fixed in the connecting hole of the first annular seat 2, and the upper end is slidably connected to the corresponding connecting hole on the second annular seat 3. The connected second annular seat 3 can slide up and down along the plurality of connecting rods 4, and a limiting component is provided at the top of the connecting rod 4 to prevent the second annular seat 3 from being separated from the connecting rod 4. Figure 2 and Figure 5 As shown, the lifting mechanism is provided with two groups, which are symmetrically arranged on both sides of the first annular seat 2 and the second annular seat 3, each group of lifting mechanism includes a first piston sleeve 9, a first piston block 18 and a first piston rod 10, the first piston sleeve 9 is vertically arranged on the top of the base 1, the first piston block 18 is slidably embedded in the first piston sleeve 9, and the first piston sleeve 9 is divided into two piston chambers, the lower end of the first piston rod 10 is connected to the top of the first piston block 18, and the upper end is connected to the upper second annular seat 3 through the connecting block 11; the hydraulic drive mechanism provides hydraulic power for the first piston block 18, drives the first piston rod 10 to move upward in the first piston sleeve 9, thereby driving the second annular seat 3 to rise along the connecting rod 4.

[0042] The first clamping assembly and the second clamping assembly arranged on the two annular seats in the first embodiment have the same structure. Figure 1 As shown, each clamping assembly includes a plurality of piston clamping heads, which are distributed in an annular shape and equidistantly on the corresponding annular seat, and the clamping ends are placed in the annular seat; each piston clamping head is as shown in FIG. Figure 4 As shown, it includes a second piston sleeve 12, a second piston block 13, a second piston rod 14 and a rubber clamping head 15. A plurality of mounting holes are correspondingly opened on the annular surface of each annular seat. The second piston sleeve 12 is penetrated and arranged in the mounting hole of the corresponding annular seat side wall. The second piston block 13 is slidably embedded on the inner wall of the second piston sleeve 12 and divides the second piston sleeve 12 into two piston chambers. One end of the second piston rod 14 is connected to the end face of the second piston block 13 adjacent to the inner ring of the annular seat, and the other end extends out of the second piston sleeve 12 and is connected to the rubber clamping head 15. The hydraulic drive mechanism provides hydraulic power for the second piston block 13, pushes the second piston rod 14 to drive the rubber clamping head 15 to move toward the center position of the annular seat, and clamps the pile body placed in the annular seat.

[0043] Embodiment 1 provides a small diameter quick pile pulling device, such as Figure 1 and Figure 8As shown, the hydraulic drive mechanism includes a hydraulic cylinder 6, a hydraulic push rod 7, a piston-type connecting piece, a first piston plate 21, a second piston plate 22, a damping telescopic rod 24 and a hydraulic oil pipeline. A fixed plate 5 is provided on the side of the base 1. The hydraulic cylinder 6 is fixedly installed on the fixed plate 5, and its bottom surface is sealed by the fixed plate 5. The first piston plate 21 and the second piston plate 22 are slidably embedded in the hydraulic cylinder 6, and the second piston plate 22 is placed below the first piston plate 21. The second piston plate 22 is provided with two pieces, and the two second piston plates 22 are connected by a spring 23. The first piston plate 21 and the two second piston plates 22 divide the hydraulic cylinder 6 into an upper hydraulic oil chamber 600, an air chamber 601, a middle hydraulic oil chamber 602 and a lower hydraulic oil chamber 603 from top to bottom. The upper hydraulic oil chamber 600, the middle hydraulic oil chamber 602 and the lower hydraulic oil chamber 603 are all filled with hydraulic oil, and no hydraulic oil is injected into the air chamber 601. The output end of the hydraulic push rod 7 slides from the upper end of the hydraulic cylinder 6 into the hydraulic cylinder and is connected to the first piston plate 21. The connection between the hydraulic push rod 7 and the hydraulic cylinder 6 is sealed, and the hydraulic push rod 7 can drive the first piston plate 21 to move in the hydraulic cylinder 6; the damping telescopic rod 24 is arranged below the lower second piston plate 22, and the telescopic end of the damping telescopic rod 24 is fixedly connected to the bottom of the lower second piston plate 22, and the lower end of the damping telescopic rod 24 is connected to the bottom surface of the hydraulic cylinder 6. Figure 8 As shown, the piston-type connecting member is arranged at the bottom of the upper second piston plate, and the upper end of the piston-type connecting member passes through the upper second piston plate and is connected to the first piston plate 21; the piston-type connecting member includes a third piston sleeve 26, a third piston block 27 and a third piston rod 28, the third piston sleeve 26 is a cylindrical structure with one end closed, the barrel mouth of the third piston sleeve 26 is fixed at the bottom of the upper second piston plate, the third piston block 27 is slidably embedded in the third piston sleeve 26, and the third piston sleeve 26 is divided into two upper and lower cavities, the cavity below the third piston block 27 is filled with air, one end of the third piston rod 28 is fixed to the bottom of the first piston plate 21, and the other end passes through the upper second piston plate 22 and then extends into the third piston sleeve 26 from the barrel mouth of the third piston sleeve 26, and is connected to the third piston block 27.

[0044] The hydraulic oil pipeline in the first embodiment is as follows Figure 1 , Figure 2 , Figures 4 to 7As shown, it includes an upper annular tube 8, a lower annular tube 29, a first connecting tube 17, a three-way tube 19 and a second connecting tube 20. The upper annular tube 8 is sleeved on the outer ring of the second annular seat 3 and is respectively connected to the rodless chambers of the second piston sleeves 12 of the multiple piston-type clamping heads on the second annular seat 3. The lower annular tube 29 is sleeved on the outer ring of the first annular seat 2 and is respectively connected to the rodless chambers of the second piston sleeves 12 of the multiple piston-type clamping heads on the first annular seat 2; one end of the first connecting tube 17 is connected to the upper annular tube 8, and the other end is connected from the bottom of the hydraulic cylinder 6. It extends into the hydraulic cylinder 6, and passes through the lower second piston plate through the hose 25 to the middle hydraulic oil chamber 602 between the two second piston plates; one end of the second connecting pipe 20 is connected with the lower annular pipe 29, and the other end leads from the top of the hydraulic cylinder 6 to the upper hydraulic oil chamber 600 located above the first piston plate 21 in the hydraulic cylinder 6; the three-way pipe 19 is arranged at the bottom of the hydraulic cylinder 6, one end of which leads to the lower hydraulic oil chamber 603 of the hydraulic cylinder 6 located below the lower second piston plate, and the other two ends are respectively connected with the rodless chamber at the lower end of the first piston sleeve 9 of the two sets of lifting mechanisms.

[0045] In the embodiment, the upper hydraulic oil chamber 600, the middle hydraulic oil chamber 602, the lower hydraulic oil chamber 603, the second connecting pipe 20, the hose 25, the first connecting pipe 17, the three-way pipe 19, the upper annular pipe 8 and the lower annular pipe 29 are all filled with hydraulic oil, the first piston sleeve 9 is filled with hydraulic oil at the position below the first piston block 18, and the second piston sleeve 12 is filled with hydraulic oil at the side of the second piston block 13 and away from the rubber clamping head 15, and the entire hydraulic system is in a sealed state. The amount of hydraulic oil in the hydraulic cylinder 6 can meet the simultaneous lifting and lowering of two sets of lifting mechanisms, and the clamping state of multiple piston clamping heads at the same time.

[0046] The hydraulic driving process of the present invention is as follows: by pushing the hydraulic push rod 7 downward, the hydraulic push rod 7 pushes the first piston plate 21 down. During the process of the first piston plate 21 descending, the third piston rod 28 drives the third piston block 27 to compress the air in the piston chamber below the third piston sleeve 26. When the air cannot be compressed, the first piston plate 21 contacts the upper second piston plate 22 and pushes the upper second piston plate to move. At this time, under the action of the damping telescopic rod 24, the upper and lower second piston plates 22 approach each other, compressing the spring 23. After the two second piston plates 22 approach each other, The hydraulic oil in the hydraulic oil chamber 602 located between the two second piston plates 22 enters the upper annular tube 8 through the hose 25 and the first connecting tube 17, and is filled into the second piston sleeve 12 of each piston clamping head of the second annular seat 3 through the upper annular tube 8. Through the injection of hydraulic oil, the second piston block 13 in the second piston sleeve 12 is pushed to move toward the center position of the second annular seat 3, thereby pushing the second piston rod 14 and the rubber clamping head 15 to move toward the center position of the second annular seat 3 to squeeze the pile body located in the second annular seat 3, thereby fixing the pile body.

[0047] As the hydraulic push rod 7 continues to work, the upper and lower second piston plates 22 are squeezed to a certain extent, and then they will drop as a whole, causing the damping telescopic rod 24 to contract, and the hydraulic oil in the lower hydraulic oil chamber 603 below the second piston plate 22 in the hydraulic cylinder 6 enters the first piston sleeves 9 of the two lifting mechanisms through the three-way pipe 19. During the injection of the hydraulic oil, the first piston blocks 18 in the two first piston sleeves 9 are simultaneously pushed upward, thereby pushing the first piston rod 10 to drive the second annular seat 3 to rise along the connecting rod 4, so that the first annular seat 2 and the second annular seat 3 are separated, and the pile body is lifted; when the second annular seat 3 rises to the highest position, the hydraulic push rod 7 is controlled to contract. During the contraction of the hydraulic push rod 7, the first piston plate 21 is first driven to rise. In the initial stage of the rise, the third piston rod 28 at the bottom of the first piston plate 21 drives the third piston block 27 to move in the third piston sleeve 26, and the gas in the third piston sleeve 26 is restored, ensuring that the second piston plate 22 remains fixed during this process, and only the first piston plate 21 rises; when the first piston plate 21 rises, the hydraulic oil in the upper hydraulic oil chamber 600 above the first piston plate 21 in the hydraulic cylinder 6 is input into the lower annular tube 29 through the second connecting pipe 20, and enters the clamping mechanism on the first annular seat 2, and then the pile body is fixed by the clamping mechanism on the first annular seat 2. When the third piston block 27 rises to the uppermost part of the third piston sleeve 26, the gas in the third piston sleeve 26 is in a normal state, and the hydraulic push rod 7 continues to move upward, which will drive the upper second piston plate 22 to rise. Under the action of the spring 23 and the damping telescopic rod 24, the two second piston plates 22 separate, and the hydraulic oil in the clamping assembly of the second annular seat 3 returns to the middle hydraulic oil chamber 602, so that the clamping assembly on the second annular seat 3 releases the pile body; the hydraulic push rod 7 continues to move upward, and after the spring 23 is completely returned to its position, the lower second piston plate 22 also rises, and the hydraulic oil in the two sets of lifting mechanisms also returns to the lower hydraulic oil chamber 603 through the three-way pipe 19, and the first piston rod 10 will descend and return to its position. Then repeat the above work, and the pile body can be pulled out again through the hydraulic push rod 7.

[0048] Embodiment 2 provides a method for using the small-diameter quick pile pulling device in Embodiment 1, which specifically includes the following steps:

[0049] Step 1: Place the base 1 on the pile body, place the pile body to be pulled out in the pile pulling hole 100 on the base 1, turn on the switch of the hydraulic push rod 7, and drive the first piston plate 21 to descend through the hydraulic push rod 7. During the process of the first piston plate 21 descending, the third piston rod 28 drives the third piston block 27 to compress the air in the piston chamber below the third piston sleeve 26;

[0050] Step 2: When the air cannot be compressed, the first piston plate 21 contacts the second piston plate 22 and pushes the second piston plate 22 to move. At this time, under the action of the damping telescopic rod 24, the two second piston plates 22 approach each other, compressing the spring 23. After the two second piston plates 22 approach each other, the hydraulic oil between the two second piston plates 22 enters the multiple piston clamping heads on the upper second annular seat 3 through the hose 25 and the first connecting pipe 17. The multiple piston clamping heads squeeze the pile body to fix the pile body.

[0051] Step 3: As the hydraulic push rod 7 continues to work, the second piston plate 22 descends, causing the damping telescopic rod 24 to contract, and the hydraulic oil in the hydraulic cylinder 6 below the second piston plate 22 enters the first piston sleeve 9 through the three-way pipe 19. The hydraulic oil and the first piston block 18 push the first piston rod 10 up, and under the action of the connecting rod 4, the first annular seat 2 and the second annular seat 3 are separated, thereby realizing the lifting of the pile body;

[0052] Step 4: When the first annular seat 2 and the second annular seat 3 are separated to a certain extent, the first piston plate 21 is driven to rise by contraction of the hydraulic push rod 7. In the initial stage of the rise, the gas of the third piston sleeve 26 is restored to realize the initial stage of the rise of the first piston plate 21. The second piston plate 22 remains fixed. When the first piston plate 21 rises, the hydraulic oil in the hydraulic cylinder 6 above the first piston plate 21 is input into the lower annular pipe 29 below through the second connecting pipe 20, and enters the clamping mechanism on the first annular seat 2 to fix the pile body.

[0053] Step 5: When the gas in the third piston sleeve 26 is in a normal state, the first piston plate 21 rises, driving the second piston plate 22 to rise. Under the action of the spring 23 and the damping telescopic rod 24, the two second piston plates 22 separate, so that the clamping mechanism on the second annular seat 3 releases the pile body. Finally, the second piston plate 22 rises, and the first piston rod 10 is lowered through the three-way pipe 19, so that the pile body can be pulled out again by the hydraulic push rod 7.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A small diameter quick pile pulling device, characterized in that: The pile pulling device comprises a base (1), a clamping mechanism and a hydraulic drive mechanism; a pile pulling hole (100) is provided on the base (1); and the clamping mechanism is mounted above the pile pulling hole (100) via a support plate (101); The clamping mechanism comprises a first annular seat (2), a second annular seat (3), a lifting mechanism, a first clamping assembly arranged on the first annular seat (2), and a second clamping assembly arranged on the second annular seat (3); the second annular seat (3) and the first annular seat (2) are arranged in parallel up and down directly above the base (1), and the hollow areas of the two annular seats are directly opposite to the pile extraction hole (100); the first annular seat (2) and the second annular seat (3) are slidably connected via a plurality of connecting rods (4); the lower end of each connecting rod (4) is fixed to the first annular seat (2), and the upper end is slidably connected to the second annular seat (3); the lifting mechanism is a piston-type lifting mechanism, the bottom of its piston sleeve is fixed to the base (1), and the top end of the piston rod is fixed to the second annular seat (3); the first clamping assembly and the second clamping assembly both comprise a plurality of piston-type clamping heads distributed along the corresponding annular seats, and the clamping end of each piston-type clamping head is placed in the annular seat, and the clamping surface thereof faces the center position of the annular seat; The hydraulic drive mechanism comprises a hydraulic cylinder (6), a hydraulic push rod (7) and a hydraulic oil pipeline. A first piston plate (21) and two second piston plates (22) are arranged in the hydraulic cylinder (6) from top to bottom. The three piston plates divide the hydraulic cylinder (6) into an upper hydraulic oil chamber (600), an air chamber (601), a middle hydraulic oil chamber (602) and a lower hydraulic oil chamber (603) from top to bottom. The first piston plate (21) is connected to the upper second piston plate (22) via a piston-type connector. The two second piston plates (22) are connected via a spring (23). The bottom of the lower second piston plate (22) is connected via a damping telescopic rod. (24) is connected to the bottom surface of the hydraulic cylinder (6); the hydraulic push rod (7) extends into the upper hydraulic oil chamber (600) of the hydraulic cylinder (6) and is connected to the first piston plate (21); the hydraulic oil pipeline includes a first connecting pipe (17) connecting the middle hydraulic oil chamber (602) and the multiple piston clamping heads of the upper second clamping assembly, a second connecting pipe (20) connecting the upper hydraulic oil chamber (600) and the multiple piston clamping heads of the lower first clamping assembly, and a third connecting pipe connecting the lower hydraulic oil chamber (603) and the piston lifting mechanism, and hydraulic oil is provided to the multiple piston clamping heads and the piston lifting mechanism through the hydraulic oil pipeline.

2. A small diameter quick pile pulling device according to claim 1, characterized in that: The piston-type lifting mechanism is provided with two groups, which are symmetrically arranged on both sides of the first annular seat (2) and the second annular seat (3); each group of the piston-type lifting mechanism comprises a first piston sleeve (9), a first piston block (18) and a first piston rod (10); the first piston sleeve (9) is vertically arranged on the top of the base (1); the first piston block (18) is slidably embedded in the first piston sleeve (9) and divides the first piston sleeve (9) into two piston chambers; the lower end of the first piston rod (10) is connected to the top of the first piston block (18), and the upper end is connected to the second annular seat (3) on the upper layer through the connecting block (11); the hydraulic drive mechanism simultaneously provides hydraulic power to the first piston blocks (18) of the two groups of piston-type lifting mechanisms, driving the first piston rod (10) to move upward in the first piston sleeve (9), thereby driving the second annular seat (3) to rise along the connecting rod (4).

3. A small diameter quick pile pulling device according to claim 1 or 2, characterized in that: The connection portion between the hydraulic push rod (7) and the hydraulic cylinder (6) is sealed, and the hydraulic push rod (7) drives the first piston plate (21) to move in the hydraulic cylinder (6); the telescopic end of the damping telescopic rod (24) is fixedly connected to the bottom of the lower second piston plate (22), and the lower end of the damping telescopic rod (24) is connected to the bottom surface of the hydraulic cylinder (6); the piston-type connecting member comprises a third piston sleeve (26), a third piston block (27) and a third piston rod (28); the third piston sleeve (26) is a cylinder structure with one end closed, and the third The mouth of the piston sleeve (26) is fixed to the bottom of the upper second piston plate. The third piston block (27) is slidably embedded in the third piston sleeve (26) and divides the third piston sleeve (26) into two upper and lower chambers. The chamber below the third piston block (27) is filled with air. One end of the third piston rod (28) is fixed to the bottom of the first piston plate (21), and the other end passes through the upper second piston plate (22) and then extends into the third piston sleeve (26) from the mouth of the third piston sleeve (26) and is connected to the third piston block (27).

4. A small diameter quick pile pulling device according to claim 2, characterized in that: The plurality of piston clamping heads of each clamping assembly are equidistantly distributed in an annular shape on the corresponding annular seat; each piston clamping head comprises a second piston sleeve (12), a second piston block (13), a second piston rod (14) and a rubber clamping head (15); a plurality of mounting holes are correspondingly provided on the annular surface of each annular seat; the second piston sleeve (12) is penetrated in the mounting hole of the corresponding annular seat side wall; the second piston block (13) is slidably embedded in the second piston sleeve (12) and divides the second piston sleeve (12) into two piston chambers; one end of the second piston rod (14) is connected to the end surface of the second piston block (13) adjacent to the inner ring of the annular seat, and the other end extends out of the second piston sleeve (12) and is connected to the rubber clamping head (15); the hydraulic drive mechanism provides hydraulic power to the second piston block (13), pushes the second piston rod (14) to drive the rubber clamping head (15) to move toward the center position of the annular seat, and clamps the pile body placed in the annular seat.

5. A small diameter quick pile pulling device according to claim 1 or 2, characterized in that: The base (1) is a circular base, and a plurality of support plates (101) are dispersedly arranged around the pile extraction hole (100), and the first annular seat (2) is arranged on the top of the support plate (101); a fixing plate (5) is provided on the side of the base (1), and the hydraulic cylinder (6) is fixedly mounted on the fixing plate (5), and its bottom surface is sealed by the fixing plate (5).

6. A small diameter quick pile pulling device according to claim 4, characterized in that: A plurality of connecting rods are equidistantly distributed along the first annular seat (2); a plurality of connecting holes (16) are correspondingly provided on the first annular seat (2) and the second annular seat (3); the lower end of each connecting rod (4) is fixed in the connecting hole of the first annular seat (2); the upper end is slidably connected to the corresponding connecting hole on the second annular seat (3); the second annular seat (3) slides up and down along the plurality of connecting rods (4) after connection; and a limiting component is provided at the top end of the connecting rod (4).

7. A small diameter quick pile pulling device according to claim 6, characterized in that: The hydraulic oil pipeline further comprises an upper annular tube (8) and a lower annular tube (29); the upper annular tube (8) is sleeved on the outer ring of the second annular seat (3) and is respectively connected to the rodless cavities of the second piston sleeves (12) of the plurality of piston-type clamping heads on the second annular seat (3) away from the clamping end; the lower annular tube (29) is sleeved on the outer ring of the first annular seat (2) and is respectively connected to the rodless cavities of the second piston sleeves (12) of the plurality of piston-type clamping heads on the first annular seat (2) away from the clamping end; one end of the first connecting tube (17) is connected to the upper annular tube (8), and the other end extends from the bottom of the hydraulic cylinder (6) into the hydraulic cylinder (6). and passes through the lower second piston plate through a hose (25) to the middle hydraulic oil chamber (602) between the two second piston plates; one end of the second connecting pipe (20) is connected to the lower annular pipe (29), and the other end leads from the top of the hydraulic cylinder (6) to the upper hydraulic oil chamber (600) located above the first piston plate (21) in the hydraulic cylinder (6); the third connecting pipe is a three-way pipe (19) arranged at the bottom of the hydraulic cylinder (6), one end of which leads to the lower hydraulic oil chamber (603) located below the lower second piston plate of the hydraulic cylinder (6), and the other two ends are respectively connected to the rodless chambers at the lower ends of the first piston sleeves (9) of the two sets of piston lifting mechanisms.

8. A small diameter quick pile pulling device according to claim 7, characterized in that: The upper hydraulic oil chamber (600), the middle hydraulic oil chamber (602) and the lower hydraulic oil chamber (603) are all filled with hydraulic oil, and no hydraulic oil is injected into the air chamber (601); the second connecting pipe (20), the hose (25), the first connecting pipe (17), the three-way pipe (19), the upper annular pipe (8) and the lower annular pipe (29) are all filled with hydraulic oil, the first piston sleeve (9) is filled with hydraulic oil at a position below the first piston block (18), and the second piston sleeve (12) is filled with hydraulic oil at a side of the second piston block (13) and away from the rubber clamping head (15), and the entire hydraulic system is in a sealed state.

9. A method for using the small-diameter quick pile pulling device according to claim 7 or 8, characterized in that: The specific steps include: Step 1: Place the base on the pile body, and place the pile body to be pulled out in the pile pulling hole of the base, turn on the switch of the hydraulic push rod, and drive the first piston plate to descend through the hydraulic push rod. During the descending process of the first piston plate, the second piston plate is kept stationary through the piston-type connecting piece between the first piston plate and the upper second piston plate, and the first piston plate is close to the upper second piston plate; Step 2: When the piston-type connector is fully retracted, the first piston plate contacts the upper second piston plate and continues to push the upper second piston plate downward. At this time, under the action of the damping telescopic rod, the two second piston plates approach each other and compress the spring. After the two second piston plates approach each other, the hydraulic oil in the hydraulic oil chamber between the two second piston plates enters each piston-type clamping head in the second clamping assembly on the upper second annular seat through the first connecting pipe; Step 3: When the hydraulic oil enters each piston clamping head in the second clamping assembly, it will squeeze the multiple piston clamping heads of the second clamping assembly to clamp and fix the pile body to be pulled at the same time; Step 4: As the hydraulic push rod continues to press down, the upper second piston plate and the lower second piston plate are squeezed to the limit, which will push the lower second piston plate down, causing the damping telescopic rod to contract, and the hydraulic oil in the lower hydraulic oil chamber below the second piston plate in the hydraulic cylinder enters the piston lifting mechanism through the third connecting pipe, driving the piston lifting mechanism to drive the upper second annular seat to rise along the connecting rod, which will drive the clamped pile body to rise as a whole, thereby achieving the lifting of the pile body; Step 5: When the second annular seat rises to the uppermost end of the connecting rod, the hydraulic push rod is controlled to contract, driving the first piston plate to rise. In the initial stage of the rise, under the action of the piston-type connecting member, the upper second piston plate does not move. When the first piston plate rises, the hydraulic oil in the upper hydraulic oil chamber above the first piston plate in the hydraulic cylinder is input into the first clamping assembly on the lower first annular seat through the second connecting pipe, so as to fix the pile body; Step 6: When the first piston plate rises until the air cavity returns to its original position, the upper second piston plate is driven to rise. Under the action of the spring and the damping telescopic rod, the two second piston plates are separated, so that the second clamping assembly on the second annular seat releases the pile body; Step seven: When the upper second piston plate rises until the spring returns to its original position, it will drive the lower second piston plate to rise. During the rising process of the lower second piston plate, the hydraulic oil in the piston lifting mechanism returns to the lower hydraulic oil chamber through the three-way pipe, and the first piston rod of the piston lifting mechanism descends to drive the upper second annular seat to descend along the connecting rod and return to its original position; the hydraulic push rod can be pressed down again to realize the pulling out of the pile body.

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