Stake puller

Abstract

To provide a pile puller capable of easily pulling out a pile from a hard ground without using excessive physical strength by lifting a lifting jig of a jack with the rotational force of an impact wrench and pushing up the pile with the jig. [Solution] The system comprises a jack 1 which pushes up and pulls out a pile driven into the ground, a jig lifting bolt 2 which is arranged inside the jack 1 and rotates on its axis, a rotating member 3 connected to the upper end of the jig lifting bolt 2, a lifting jig 4 which rises and falls by a screw motion caused by the rotation of the jig lifting bolt 2 on its axis, a single-pipe clamp 7 which is connected to the lifting jig 4 and clamps the upper side of the pile 6, and an impact wrench 8 which rotates the rotating member 3.

Description

[Technical field]

[0001] This invention relates to a pile puller used to pull out piles that have been driven into the ground at construction sites, etc., after work is completed, and in particular to a pile puller that has a jig that raises a jack to easily pull out piles from hard ground without using excessive physical strength, and an impact wrench that rotates and raises the jig. [Background technology]

[0002] At construction sites, many piles are driven into the ground, and these piles are often pulled out after work is completed. For this purpose, various tools are used. For example, a pantograph jack or a device that uses the principle of leverage could not remove piles that had been driven into hard ground (such as asphalt road surfaces). Furthermore, if there are a large number of stakes, it requires considerable physical strength. Hydraulic jacks are used to pull out piles from hard ground, but they also require equipment such as generators and are time-consuming because of their slow lifting speed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7462992 [Patent Document 2] Utility model registration No. 3246217 [Patent Document 3] Utility model registration No. 3141504 [Patent Document 4] Patent Publication No. 2013-044110 [Patent Document 5] Patent Publication No. 2007-297800 [Patent Document 6] Utility model registration No. 3241609 [Patent Document 7] Patent Publication No. 2004-092258 [Patent Document 8] Patent Publication No. 09-163876 [Patent Document 9] Patent Publication No. 2023-172131 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned pantograph jack, devices that apply the principle of leverage, hydraulic jacks, etc. have difficulty in removing piles that are driven in at an angle, and because the amount of lift in one go is small, it is necessary to repeat the same operation several times to remove the pile.

[0005] This invention was invented in consideration of the above problems and to solve them, and its purpose is to provide a pile puller that uses the rotational driving force of an impact wrench to raise a jack lifting jig, which then pushes up the pile, allowing the pile to be easily pulled out of hard ground without using excessive physical strength. [Means for solving the problem]

[0006] In order to achieve the above objects, this invention comprises a means comprising a jack that is placed upside down on the ground when in use and is used to push up and pull out a pile that has been driven into the ground, a jig lifting bolt that is placed inside the jack and rotates on its axis, a rotating member connected to the upper end of the jig lifting bolt, a lifting jig that rises and falls by a screw motion caused by the rotation of the jig lifting bolt, a single-pipe clamp connected to the rising lifting jig and clamping the upper side of the pile, and an impact wrench that rotates the rotating member that rotates the jig lifting bolt. Effect of the Invention

[0007] With the pile extractor of this invention, it is possible to pull out piles that are driven into hard ground and cannot be pulled out even with a 3-ton lifting jack, and even piles that are driven in at an angle, in one operation by applying the axial force of the jig lifting bolt, thereby shortening the work time. In this way, the rotational force of the electric impact wrench is used to raise the jack lifting jig, which is then used to push up the pile, providing an extremely practical and beneficial effect of making it possible to easily pull out the pile from hard ground without using excessive physical strength. [Brief description of the drawings]

[0008] [Figure 1] 1 is an overall side view showing a form for implementing the present invention; [Diagram 2] 1 is a perspective view of a jack showing an embodiment of the present invention; [Diagram 3] 1 is a front perspective view of a jack showing an embodiment of the present invention; [Figure 4] 1 is an overall plan view showing an embodiment of the present invention; [Diagram 5] 1 is a partial side cross-sectional view of the inside of a jack showing an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present invention will be described in more detail based on the embodiments of the invention illustrated in the drawings. In the figure, the pile extraction tool is composed of a jack 1 that pushes up and pulls out a pile 6 that has been driven into hard ground, a jig lifting bolt 2 that is positioned inside the jack 1 and rotates on its axis, a rotating member 3 connected to the upper end of the jig lifting bolt 2, a lifting jig 4 that rises and falls by a screw motion caused by the rotation of the jig lifting bolt 2, a single-pipe clamp 7 connected to the rising lifting jig 4 and clamps the upper side of the pile 6, and an impact wrench 8 that rotates the rotating member 3 that rotates the jig lifting bolt 2 on its axis.

[0010] The jack 1 is made of strong metal and has a hollow cylindrical shape. When in use, the jack 1 is placed facing upside down on solid ground. A cylindrical metal upper lid 1a and a lower lid 1b are attached to the upper and lower ends of the cylinder of the jack 1, respectively. A hole (not shown) is formed in the center of the upper lid 1a and the lower lid 1b.

[0011] A jig lifting bolt 2 is disposed inside the jack 1. The jig lifting bolt 2 is disposed parallel to the axial direction of the jack 1 in the central portion inside the jack 1. Both the upper and lower ends of the jig lifting bolt 2 disposed inside the jack 1 are rotatably, i.e., axially supported by holes (not shown) formed in the central portions of the upper cover 1a and the lower cover 1b.

[0012] The jig lifting bolt 2, which is journalled between the upper and lower lids 1a and 1b, is a round metal bar extending in the vertical direction, with a helical thread cut on the entire periphery. A rotating member 3, for example a hexagonal column, with a diameter larger than that of the round bar is attached to the head, which is the upper end of the jig lifting bolt 2.

[0013] The upper end side of the jig lifting bolt 2 arranged inside the jack 1 passes through a hole in the upper cover 1a and is integrally connected to the rotation center of the rotating member 3 attached to the top of the upper cover 1a. The rotating member 3 used has, for example, a hexagonal shape when viewed from above.

[0014] The rotating member 3 on the upper end side of the jack 1 is attached to the top surface of the upper lid 1a so as to be freely rotatable in both directions. When the rotating member 3 is rotated in both directions, the jig lifting bolt 2, whose upper and lower ends are rotatably supported in holes in the center of the upper lid 1a and the lower lid 1b, rotate together around an axis in the same direction.

[0015] A rectangular bottom plate 5, for example, is attached to the bottom end of the jack 1 via a lower cover 1b. The bottom surface of the lower cover 1b is fixed to the center of the top surface of the bottom plate 5 by welding or the like. A downward load acts on the bottom plate 5 on the lower end side of the jack 1 during use, but the jack 1 is supported on the ground GL by this bottom plate 5.

[0016] The lifting jig 4 serves the function of pushing up the pile 6 driven into the hard ground through the single pipe clamp 7 that clamps the upper side of the pile 6, and pulling it out of the hard ground. The lifting jig 4 is made of a thick metal member because it exerts the force required to pull out the pile 6 through the single pipe clamp 7. The plate thickness of the lifting jig 4 is smaller than the groove width of the jig lifting groove 1c of the jack 1 described below, and is designed to protrude from the jig lifting groove 1c.

[0017] The thick lifting jig 4 faces upside down when the jack 1 is in use, with its upper edge protruding horizontally from the side of the jack 1, the tip of the protruding upper edge formed at a right angle downward, and its lower side inclining diagonally downward in the retracting direction, with its lower edge formed parallel to the upper edge. The lifting jig 4 of this shape is connected to a jig lifting nut 4a attached inside the jack 1.

[0018] The jig lifting nut 4a is attached horizontally inside the jack 1. The jig lifting nut 4a has a cylindrical outer shape with an outer diameter slightly smaller than the inner diameter of the cylindrical jack 1 so that it can move smoothly up and down without coming into contact with the inner peripheral side surface of the cylindrical jack 1.

[0019] A jig lifting bolt hole is formed in the center of the jig lifting nut 4a, through which the jig lifting bolt 2 is screwed. For this purpose, a helical thread is cut on the inner peripheral side surface of the jig lifting bolt hole to screw with the jig lifting bolt 2. The jig lifting nut 4a used is the same as a commonly known nut.

[0020] The jig lifting nut 4a moves vertically, that is, rises and falls, along the outer peripheral side surface of the helically threaded jig lifting bolt 2 by screw motion through the jig lifting bolt hole. The lifting jig 4 connected to the jig lifting nut 4a, which rises and falls vertically, also rises and falls together.

[0021] A jig lifting groove 1c is formed on the outer peripheral side surface of the jack 1 along the longitudinal direction of the jack 1, that is, along the lifting direction of the lifting jig 4. The base end side of the lifting jig 4 passes through this jig lifting groove 1c and is integrally connected to a jig lifting nut 4a that is screwed onto the jig lifting bolt 2 inside the jack 1 so as to be freely liftable.

[0022] When the jig lifting bolt 2 rotates in one direction, i.e., rotates on its axis, the lifting jig 4, whose base end side jig lifting nut 4a is screwed onto the jig lifting bolt 2, attempts to rotate in the same direction as the axial rotation of the jig lifting bolt 2.

[0023] However, since the lifting jig 4 protrudes from the jig lifting groove 1c and both sides are sandwiched in the groove 1c, it cannot rotate and rises and moves upward by screw motion. When the jig lifting bolt 2 rotates in the opposite direction, the lifting jig 4, which is screwed to the jig lifting bolt 2 via the jig lifting nut 4a, descends by screw motion.

[0024] The single pipe clamp 7 is used to firmly clamp the upper side of the pile 6. The single pipe clamp 7 that clamps the upper side of the pile 6 is connected to the upper part of the lifting jig 4 that protrudes outward from the jig lifting groove 1c formed on the outer circumferential side of the jack 1, and serves to push the pile 6 upward through the rising lifting jig 4. For example, a commercially available product is used as the single pipe clamp 7.

[0025] The impact wrench 8 serves to easily rotate the rotating member 3 of the jack 1 at the site without having to turn it by hand. A commercially available impact wrench 8 generally comprises a spindle to which rotation is transmitted from a motor, a hammer that is cam-coupled to the spindle and biased forward by a coil spring, and an anvil that engages with the hammer in the rotational direction and protrudes forward.

[0026] A socket (not shown) having, for example, a hexagonal hole is attached to the tip of the anvil of the impact wrench 8 in order to fit and rotate the rotating member 3 of the jack 1 from the outside. The impact wrench 8 is also equipped with, for example, a battery as a power source, and the rotating member 3 of the jack 1 can be easily rotated using the impact wrench 8 even at a site where there is no power source nearby.

[0027] Next, a method of using the stake puller based on the configuration of the embodiment for carrying out the invention will be described below. The pile extractor according to this invention is brought to and set up next to a pile 6 that has been driven into hard ground. The bottom plate 5 of the jack 1 constituting the pile extractor is set up facing up and down on the ground next to the pile 6, and a single pipe clamp 7 firmly clamped to the upper side of the pile 6 is connected to the lifting jig 4 that protrudes outward from a jig lifting groove 1c formed facing up and down on the outer periphery side of the jack 1.

[0028] At this time, the lifting jig 4 protruding from the outer periphery of the jack 1 is pre-adjusted to a height that corresponds to the height of the pile 6 to be pulled out. The protruding height of the lifting jig 4 is adjusted by rotating the rotating member 3 on the upper end of the jack 1 in the reverse direction. The rotating member 3 is adjusted by rotating it in the reverse direction using an impact wrench 8. The impact wrench 8 is equipped with a battery, so it can be used even at sites where there is no power source nearby.

[0029] A socket (not shown) having, for example, a hexagonal hole is attached to the tip of the anvil of the impact wrench 8, which rotates the rotating member 3 on the upper end side of the jack 1 in one direction, and the rotating member 3 of the jack 1 is fitted into the socket. When the torque to the anvil increases, the hammer repeatedly engages and disengages with the anvil, generating intermittent shocks (impacts) in the direction of rotation, and causing the rotating member 3 on the upper end side of the jack 1 to rotate.

[0030] The impact wrench 8 rotates the rotating member 3 through the fitted socket, and this rotating member 3 rotates the jig lifting bolt 2 connected to the upper end head in one direction. The jig lifting nut 4a rises by screw motion in conjunction with the rotation of the jig lifting bolt 2. Since the lifting jig 4 is connected to the rising jig lifting nut 4a, the lifting jig 4 rises along the jig lifting groove 1c in conjunction with the rise of the jig lifting nut 4a.

[0031] A single pipe clamp 7 is connected to the rising lifting jig 4, and the upper side of the pile 6 is firmly clamped to this single pipe clamp 7. Therefore, the jack 1, whose rotating member 3 is rotated by the impact wrench 8, pushes the upper side of the pile 6 upward via the rising lifting jig 4 and the single pipe clamp 7. This allows the worker on-site to easily pull out the pile 6 from the hard ground without using excessive physical strength.

[0032] Incidentally, this invention is not limited to the above-mentioned embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of this invention. [Explanation of symbols]

[0033] 1 Jack 1a Upper lid 1b Lower lid 1c Jig lifting groove 2 Jig lifting bolt 3 Rotating parts 4 Lifting jig 4a Jig lifting nut 5 Bottom plate 6 stakes 7 Single pipe clamp 8. Impact wrench

Claims

[Claim 1] This pile puller is characterized by comprising: a jack that is placed upside down on the ground when in use and is used to push up and pull out a pile that has been driven into the ground; a jig lifting bolt that is placed inside the jack and rotates on its axis; a rotating member connected to the upper end of the jig lifting bolt; a lifting jig that rises and falls by a screw motion caused by the axial rotation of the jig lifting bolt; a single-pipe clamp connected to the rising lifting jig and clamps the upper side of the pile; and an impact wrench that rotates the rotating member that rotates the jig lifting bolt on its axis.

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