JP2007120123A - Pile extraction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile extraction device capable of surely extracting an existing pile P by developing a sufficient holding force on the existing pile P by a simple structure. <P>SOLUTION: This pile extraction device comprises a drive part 1a. A soil pressure is added to a casing 1 advancing into a soil when reversely rotated by the driving according to the normal rotation of the casing 1. The pile extraction device comprises a plurality of holding claws 2 advancing into the casing by horizontally rotating around a first shaft 20 extending in the axial direction of the casing 1 and engaged with the existing pile P in the casing 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile removing device used for extracting existing piles such as old concrete piles, wooden piles, steel pipe piles, etc., which are no longer necessary for redevelopment of urban areas.

It is necessary to extract old existing piles such as concrete piles from the ground in order to reclaim land in the redevelopment of urban areas. Conventionally, a pile removing device for extracting an existing pile by mechanical force has been proposed. The pile removing device includes an inner cylinder and an outer cylinder inserted and fitted into the inner cylinder, a cylinder attached between the inner cylinder and the outer cylinder, and a cylinder that advances the outer cylinder relative to the inner cylinder, and an inner cylinder. And a gripping mechanism that is operated by the advancement of the outer cylinder accompanying the operation of Further, the gripping mechanism is attached to the lower side of the inner cylinder in a vertically oriented posture on a rotary shaft extending in a direction perpendicular to the axial direction of the inner cylinder, and the inner cylinder is moved downward by the movement of the cylinder. A plate-like gripping member that advances to the front is provided (Patent Document 1). When removing the existing pile, after inserting the inner and outer cylinders around the existing pile, the outer cylinder is lowered with respect to the inner cylinder by the operation of the cylinder, and the gripping member is pushed by the tip of the outer cylinder accordingly. The tip of the gripping member is advanced to the inside of the inner cylinder around the rotation axis, and the tip of the gripping member is pressed against an existing pile in the inner cylinder to be clamped. Thereafter, the entire inner and outer cylinders are lifted upward together with the existing piles, and the existing piles are extracted.
Japanese Patent Laid-Open No. 2001-164572

  However, in the conventional pile removing device, since the cylinder is used to lower the outer cylinder with respect to the inner cylinder in order to hold the existing pile with the holding member, the complicated pressure oil supplied to and discharged from the cylinder is used. Piping is required. In addition, since the outer cylinder is lowered while the entire surface is in contact with the soil in the ground, the cylinder requires a large amount of power, which is not only expensive but also causes noise problems for local residents. . In addition, the gripping member of the gripping mechanism is attached to a rotary shaft extending in a direction orthogonal to the axial direction of the inner cylinder in a vertically oriented posture, and advances toward the inner cylinder around the rotary axis. In order to grip the existing pile, it is difficult to say that the clamping force against the existing pile is sufficient, and the gripping member may rotate freely in the direction of escaping outward with respect to the existing pile during extraction, and the gripping force may be impaired. There is poor reliability.

  Therefore, an object of the present invention is to provide a pile removing device that can exhibit a sufficient clamping force with respect to an existing pile with a simple configuration and reliably extract the existing pile.

  In order to achieve the above object, a pile removing apparatus according to the first configuration of the present invention includes a drive unit, and rotates in the reverse direction by the drive to enter the soil. When pressure is applied, it pivots horizontally around the first axis extending in the axial direction of the casing, advances into the casing, and attaches a plurality of clamping claws that bite into existing piles inside .

  When extracting an existing pile, the casing is rotated around the existing pile while being reversely rotated, and then the casing is rotated forward. Then, due to the normal rotation of the casing, the plurality of clamping claws receive earth pressure, rotate in the horizontal direction around the first axis extending in the axial direction of the casing, advance into the casing, and are located in the casing. Bit into the pile. The existing pile is extracted by pulling up the casing from the soil in a state where the clamping claws are bitten. At this time, when the clamping claws are bitten into the existing pile, the clamping claws are rotated in the horizontal direction by the forward rotation of the casing, and are advanced into the casing so as to be bitten into the existing pile. As in the case, it is not necessary to use a large cylinder or the like. Further, the clamping claw is configured to clamp the existing pile by rotating horizontally around the first axis extending in the axial direction of the casing and advancing into the casing. Sometimes, the holding claws do not slip, and a sufficient holding force is exerted on the existing piles so that the existing piles can be pulled out reliably.

  In a preferred embodiment of the present invention, the sandwiching claws are positioned outside the casing and are nail pieces that bite into an existing pile supported rotatably about a first axis extending in the axial direction of the casing. And an operating piece that rotates the claw piece under pressure. With the clamping claws having this configuration, a sufficient clamping force can be exerted on the existing pile, and the existing pile can be extracted more reliably.

  The pile removing device according to the second configuration of the present invention, in the casing provided with the driving unit, advances into the casing along with the forward rotation of the casing together with the clamping claws according to claim 1, to the existing pile in the casing. A plurality of sub clamping claws for biting are attached.

  When the existing pile is extracted by the pile removing device having the second configuration, the holding claw according to claim 1 is bitten into the existing pile, and the auxiliary holding claw is advanced into the casing by forward rotation of the casing. In this state, the existing pile is pulled out by pulling the casing from the soil. In this way, the existing pile can be extracted more reliably by holding and extracting the two places of the existing pile with the plurality of holding claws and the plurality of auxiliary holding claws.

  In a preferred embodiment of the present invention, the auxiliary clamping claw is supported so as to be able to advance and retreat in and out of the casing by rotating in the horizontal direction around the second axis extending in the axial direction of the casing. With the auxiliary clamping claws of this configuration, a sufficient clamping force can be exerted on the existing pile, and the existing pile can be extracted more reliably.

  According to the above pile extraction apparatus, it is possible to reliably extract the existing pile by exhibiting a sufficient clamping force with respect to the existing pile with a simple configuration.

  Hereinafter, a pile removing device according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an overall structure of a pile removing apparatus PO according to an embodiment of the present invention, and FIG. 2 is a side view showing a state when an existing pile P is extracted by the pile removing apparatus PO. In this figure, a leader L is attached to the front of a crawler type self-propelled vehicle C via a support arm A and a backstay B, and the leader L is supported by a pile removing device PO. The pile removing device PO is inserted and fitted around the existing pile P in the soil E by reversely rotating in the direction of arrow a in the figure.

  FIG. 3 is an enlarged front view showing a main part of the pile removing apparatus PO, and FIG. 4 is a longitudinal sectional view thereof. As shown in FIG. 1, the pile removing device PO includes a plurality of metal casings 1 that are vertically connected to each other, and the upper end of the uppermost casing 1 is rotated forward and forward to rotate the casing 1 in the soil E. And a plurality of metal clamping claws 2 are provided at a lower position of the lowermost casing 1, and a plurality of metal auxiliary clamping claws 3 are provided at an upper position thereof. Yes. The lowermost casing 1 is composed of two members, a first cylinder 11 and a second cylinder 12 that is inserted and connected to the outer periphery of the first cylinder 11. A sub-clamping claw 3 is attached, and the rotational power of the first cylinder 11 is transmitted to the sub-clamping claw 3 and rotated around the outer periphery of the connecting portion of the first and second cylinders 11 and 12. A third cylinder 13 is attached.

  5 and 6 are plan sectional views as seen from the X-X and Y-Y directions in FIG. 3, and FIGS. 7 and 8 show that the holding claw 2 and the auxiliary holding claw 3 are moved from the states shown in FIGS. It is a plane sectional view showing the state. As shown in FIG. 5 and FIG. 7, the clamping claw 2 is attached to the wall portion of the second cylinder 12 and extends in the horizontal direction to bite into the existing pile P, and is located near the claw piece 21. And an operating piece 22 extending in the vertical direction that receives earth pressure and rotates the claw piece 21 toward the existing pile P when the second cylinder 12 is rotated forward in the direction of arrow b in FIG. Yes.

  When the claw piece 21 is supported by the second cylinder 12, as shown in FIG. 3, a long rectangular hole-shaped attachment hole 12 a is formed in the circumferential direction in the attachment part of the claw piece 21 in the second cylinder 12. A metal cover 23 that is substantially the same shape as the attachment hole 12a and is open at a lower portion is integrally attached to the outside of the second cylindrical body 12 by welding, and the claw piece 21 is attached to the cover 23. The first cylinder 20 extending in the axial direction of the second cylinder 12 is supported so as to be able to advance and retract from the mounting hole 12a. In the illustrated embodiment, the claw piece 21 is divided into two members, a claw piece main body 21a and a support 21b that supports the claw piece main body 21a, and the claw piece main body 21a is fixed to the support 21b with a plurality of bolts 21c. The support 21 b is supported inside the cover 23 by the first shaft 20. Thus, by forming the claw piece 21 with the two members of the claw piece main body 21a and the support body 21b, for example, when the claw piece main body 21a is damaged, it can be easily replaced, and all the members are replaced. Compared to the case, the cost is reduced.

  Further, as shown in FIG. 3, the operating piece 22 is integrally formed with a pressing portion 22 a located behind the support 21 b of the claw piece 21 inside the cover 23, and below the cover 23. A rotating shaft 22c that extends downward from the open portion and receives the earth pressure directly, and extends in the vertical middle portion of the pressing portion 22a in a direction orthogonal to the axial direction of the second cylindrical body 12. It is supported so that it can rotate around the center.

  On the other hand, as shown in FIGS. 6 and 8, the auxiliary clamping claw 3 is provided integrally with a claw piece 31 that bites into an existing pile P, and is pressed by the third cylinder 13 so as to disengage the claw piece 31. And a second shaft 30 extending in the axial direction of the second cylinder 12 through an attachment hole 12b formed in the second cylinder 12 at an intermediate portion between the claw piece 31 and the operation piece 32. It is rotatably supported through

  In rotating the sub clamping claw 3 by the rotational power from the first cylinder 11, in the illustrated embodiment, the following is performed. That is, as shown in FIG. 4, a plurality of long rectangular holes 12c in the circumferential direction are formed in the upper part of the peripheral wall of the second cylindrical body 12, and the outer peripheral wall of the first cylindrical body 11 has a width narrower than that of the rectangular hole 12c. A plurality of square pieces 15 respectively engaged with the square holes 12c are fixed integrally, the fourth cylinder 14 is inserted into the outer periphery of the square pieces 15, and the fourth cylinder 14 is further inserted into the outer periphery of the fourth cylinder 14. The 3rd cylinder 13 is inserted, and the 1st cylinder 11, the square piece 15, the 4th cylinder 14, and the 3rd cylinder 13 are being fixed integrally, respectively. Further, a rectangular hole 13a which is long in the circumferential direction is formed at a lower position of the third cylindrical body 13, and the operating piece 32 of the auxiliary clamping claw 3 is inserted into the rectangular hole 13a.

  Then, the first cylinder 11 is rotated forward by the drive unit 1a, so that the outer peripheral square piece 15, the fourth cylinder 14 and the third cylinder 13 are rotated forward. An attachment hole 12b formed in the second cylinder 12 by pressing the operating piece 32 of the auxiliary clamping claw 3 with the edge of the formed square hole 13a and rotating the tip of the claw piece 31 about the second shaft 30. To advance radially inward.

  In the embodiments shown in the drawings, a plurality of excavation bits 16 are fixed to the lower end of the second cylinder 12 and between the clamping claws 2 and the auxiliary clamping claws 3 on the outer periphery of the second cylinder 12. These excavation bits 16 allow the casing 1 to enter the soil while excavating the soil E.

  Next, the procedure for extracting the existing pile P using the pile removing apparatus PO having the above configuration will be described. First, as shown in FIG. 1, the pile removing device PO is positioned right above the existing pile P embedded in the soil E, and each casing 1 is rotated in the direction of the arrow a by the drive unit 1a. Insert around the pile P. That is, with the reverse rotation of the first cylinder 11 of the casing 1, the square piece 15 provided on the outer periphery thereof moves in the square hole 12 c of the second cylinder 12, and the edge of the square hole 12 c is moved to the corner. When the piece 15 is pressed, the second cylinder 12 is reversely rotated and enters the soil E. At this time, the fourth cylindrical body 14 and the third cylindrical body 13 are also rotated reversely following the first cylindrical body 11. Further, at this time, the operating piece 22 of the clamping claw 2 provided on the second cylindrical body 12 does not push the claw piece 21 by receiving earth pressure in the direction of the opposite arrow c in FIG. Since the claw piece 21 does not advance inward of the second cylinder 12, the claw piece 21 is housed in the cover 23 and held in the retracted state by the second cylinder 12 as shown in FIG. 5. . On the other hand, when the third cylinder 13 rotates in the direction a following the second cylinder 12, the sub-nipping claw 3 of the second cylinder 12 also has the claw piece 31 as shown in FIG. The two cylinders 12 are held in the retracted state inside the mounting holes 12b.

  Thereafter, as shown in FIG. 2, each casing 1 of the pile removing device PO is rotated forward in the direction of the arrow b by the drive unit 1a, and the existing pile P is extracted. At this time, when the casing 1 is normally rotated in the direction b, the first cylinder body 11 to the third cylinder body 13 are both rotated in the same direction. That is, as the first cylinder 11 rotates forward, the outer peripheral square piece 15 moves in the opposite direction to the reverse rotation in the square hole 12c of the second cylinder 12, and the square hole 12c When the square piece 15 presses the other edge, the second cylinder 12 is rotated forward via the fourth cylinder 14 and the third cylinder 13. As the second cylinder 12 rotates forward, the receiving portion 22b of the operating piece 22 constituting the clamping claw 2 receives earth pressure from the direction of the arrow c in FIG. 3, and the pressing portion 22a on the upper portion of the receiving portion 22b It is rotated in the reverse c direction around the rotation shaft 22c. Then, the claw piece 21 is rotated horizontally around the first shaft 20 extending in the axial direction of the casing 1 by the pressing portion 22a as shown in FIG. 7, and the claw piece main body 21a of the claw piece 21 is rotated. Bites into the existing pile P in each cylinder 11-13.

  At this time, when the claw piece 21 of the clamping claw 2 is bitten into the existing pile P, the claw piece 21 is rotated in the horizontal direction around the first shaft 20 by the normal rotation of the casing 1, and the second cylindrical body 12. Since it advances to the inside and can be bitten into the existing pile P, it is not necessary to use a large cylinder or the like as in the conventional case. Further, the sandwiching claw 2 is configured to rotate horizontally around the first shaft 20 extending in the axial direction of the casing 1, thereby causing the claw piece 21 to be caught in the existing pile P and sandwiched. For this reason, the clamping claws 2 do not escape outward from the existing pile P during extraction, and a sufficient clamping force is exerted on the existing pile P, so that the existing pile P can be extracted reliably.

  At the same time, the secondary clamping claw 3 of the second cylindrical body 12 has a square hole 13a formed in the third cylindrical body 13 as shown in FIG. 8 when the third cylindrical body 13 is normally rotated in the direction b. The operating piece 32 is pressed by the end edge of the claw piece 31, and the tip of the claw piece 31 is rotated in the horizontal direction around the second shaft 30 to radially inward from the mounting hole 12 b formed in the second cylinder 12. It advances and it bites into the existing pile P in each cylinder 11-13.

  As described above, after the clamping claw 2 and the sub clamping claw 3 are bitten into the existing pile P, the casing 1 is rotated forward in the direction of the arrow b by the drive unit 1a as shown in FIG. By pulling up from the soil E, the existing pile P is extracted together with the casing 1. As in the above-described embodiment, the existing pile P is clamped at the two positions by the plurality of clamping claws 2 and the plurality of auxiliary clamping claws 3 and the existing pile P is extracted, so that the work can be reliably performed.

It is a side view showing the whole pile removal device structure concerning one embodiment of the present invention. It is a side drawing which shows a state when extracting an existing pile with a pile removal apparatus. It is a front view which expands and shows the principal part of a pile removal apparatus. It is the longitudinal cross-sectional view. It is the plane sectional view seen from the XX line direction of FIG. It is the plane sectional view seen from the YY line direction of FIG. FIG. 6 is a cross-sectional plan view showing a state in which the clamping claw and the auxiliary clamping claw have moved from the state of FIG. It is a plane sectional view which shows the state which the clamping nail and the sub clamping nail moved from the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 1a Drive part 2 Clamping claw 20 1st axis | shaft 21 Claw piece 22 Receiving piece 3 Sub clamping claw 30 2nd axis | shaft P Existing pile

Claims (4)

  A casing that includes a drive unit and rotates reversely by the drive and enters the soil is subjected to earth pressure along with the forward rotation of the casing, thereby horizontally extending around the first axis extending in the axial direction of the casing. A pile removing device to which a plurality of clamping claws are attached that rotate in the direction and advance into the casing and bite into the existing pile inside.   In Claim 1, the said nail | claw is located in the exterior of a casing, the nail | claw piece which bites into the existing pile supported rotatably about the 1st axis | shaft extended in the axial direction of a casing, and receives earth pressure. And a pile removing device having an operating piece for rotating the claw piece.   Pile puncher in which a plurality of sub-clamping claws are attached to a casing provided with a drive unit, together with the clamping claws according to claim 1, advancing into the casing as the casing rotates forward and biting into existing piles in the casing apparatus.   4. The pile removing device according to claim 3, wherein the auxiliary clamping claws are supported so as to be able to advance and retreat in and out of the casing by rotating in a horizontal direction around a second axis extending in the axial direction of the casing.

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