JP2018003489A - Pile extractor and pile extraction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile extractor capable of extracting a pile without hindrance even at a work place with a restriction on a height, an available space, etc.SOLUTION: A pile extractor 1 is for extracting a pile buried in a ground, and includes a first chuck 1a and a second chuck 1b suspended from pressure bearing means above ground. The first chuck 1a and the second chuck 1b are respectively provided with chuck means 1d for gripping the pile by pressing a chuck member against a peripheral wall surface of the pile. The first chuck 1a is suspended through a lifting cylinder, while the second chuck 1b is suspended by the pressure bearing means (4, 4a) through a connecting rod, at a position below the first chuck 1a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pile pulling apparatus and a pile pulling method capable of pulling out a pile without hindrance even in an environment where the height of the pile embedded in the ground is limited or the space is limited. Is.

  Conventionally, in order to pull out piles such as H steel and concrete piles embedded in the ground, the pulling force of the wire is increased by a pulley and the pile is pulled out and collected on the ground. For example, a pile construction machine as described in Patent Document 1 is known. This pile construction machine has a mechanism in which a wire is wound through a pulley between an auger machine attached to a leader and a leader base. And a limit switch that detects the height of the weight at the first reference position and a control device that controls the rotation speed of the winch drum.

JP 2010-196371 A

  However, in the past, pile removal machines have been used in places where pulling piles are under highways, under bridges, where there are restrictions on the height of high-voltage cables, etc., or where there is limited space and large cranes cannot enter. There is a problem that cannot be used.

  In addition, since the wire is wound around the pile and pulled out, there are wire cuts, slipping, etc., and people must enter the hole, so accidents are always dangerous and dangerous. Ensuring is an issue. The pile drawing device and the pile drawing method according to the present invention have been proposed in order to solve such problems.

  The gist for solving the above-mentioned problems of the pile pulling device according to the present invention is to achieve the object, in the device for pulling out the pile embedded in the ground, the first chuck suspended by the ground-side supporting means; And a chuck means for pressing the chuck member against the peripheral wall surface of the pile to grip the pile, and the first chuck is a lifting cylinder. And the second chuck is suspended from the supporting means at a position below the first chuck via a connecting rod.

  The pressure bearing means is provided with a hole for penetrating at least the pile.

  The chuck member of the chuck means is arranged around the support shaft so that the diameter of the pile can correspond to the size within the range so that the chuck member enters in the radial direction of the pile and abuts and grips the peripheral wall surface of the pile. It rotates in the radial direction.

  The gist for solving the above-mentioned problems of the method for pulling out a pile according to the present invention is to form a pile pulling-out device according to the present invention, and the following a) a first chuck is attached to the head of the pile The second chuck is held in a released state, the first chuck is lifted by the lifting cylinder and the pile is pulled out, and a pile pulling process is performed. B) The lifted pile is gripped by the second chuck. And a pile holding step of releasing the gripping action of the first chuck and lowering the first chuck with the lifting cylinder, and repeating the pile drawing step and the pile holding step to remove the pile embedded in the ground. To pull it out.

According to the pulling device for a pile and the pulling device for a pile according to the present invention, the tall or large pile pulling device has a height restriction and a restriction in a narrow space, and the pulling operation The pile can be pulled out even at work sites where this is impossible.
Moreover, since a person enters the hole in the ground and it is not necessary to perform the work, an excellent effect of ensuring safety in the pulling work of the pile is achieved.

It is the top view (A) of use condition in the drawing apparatus 1 for piles which concerns on this invention, and a side longitudinal cross-sectional view (B) similarly. FIG. 2 is an enlarged detailed plan view (A) in a state where the chuck means 1d is opened and an enlarged detailed plan view (B) in a state where the chuck means 1d is closed in a part of the pile pulling device 1 according to the present invention. It is explanatory drawing (1), (2), (3), (4) explaining the pulling-out method of a pile with the pulling-out apparatus 1 for the pile which concerns on the same invention.

  As shown in FIGS. 1 (A) and 1 (B), a pile pulling apparatus 1 according to the present invention grips an embedded pile 3 and lifts and lowers it by a lifting means, and a pile. The embedded pile 3 is pulled out by the second chuck 1b that only grips.

  As shown in FIG. 1 to FIG. 2, the pile pulling device 1 according to the present invention has a first chuck 1 a suspended from a support plate 4 and a lifting support plate 4 a that are ground support units. A second chuck 1b is provided.

  The first chuck 1 a and the second chuck 1 b are respectively provided with chuck means 1 d for pressing the chuck member 1 h against the peripheral wall surface of the pile 3 to grip the pile 3.

  The first chuck 1 a is suspended from the lifting support plate 4 a via the lifting cylinder 7. The raising / lowering cylinder 7 has a base portion rotatably connected to the raising / lowering upper plate 8 via a bracket 7a. Further, the end of the rod 7c of the cylinder 7 is rotatably connected to the bracket 7b, and is connected to the lower surface of the elevating support plate 4a via the bracket 7b.

  The first chuck 1a is provided between the elevating upper plate 8 and the elevating / lowering plate 8a in three or four locations around the pile 3 in an even arrangement.

  As shown in FIG. 1 (B), the second chuck 1b is disposed below the first chuck 1a, and the support plate 4 and the elevating support plate 4a, which are the support units, are connected via a connecting rod 6. Is suspended.

  The pressure bearing plate 4 and the lifting support plate 4a, which are the pressure bearing means, are provided with holes 4b that allow at least the pile 3 to penetrate therethrough. Further, the elevating support plate 4 a is laid on a metal base material 5 laid directly on the ground 2 under the support plate 4.

  As shown in FIGS. 2 (A) and 2 (B), the chuck member 1h of the chuck means 1d enters from the radially outer side to the inner side of the pile 3 so as to come into contact with and grip the peripheral wall surface of the pile 3. The diameter of the pile 3 is rotated in the radial direction of the pile 3 around the support shaft 1k so as to be able to cope with a difference in size within an arbitrary range, for example.

  As shown in FIG. 2, the chuck means 1d has a chuck cylinder 1e, a rotation support portion 1f that rotatably supports the base portion of the cylinder 1e, and a link connected to the tip of the rod 1j of the cylinder 1e. 1g, and a chuck member 1h that is integrated with the ring 1g and swings about the support shaft 1k when the link 1g swings about the support shaft 1k. As shown in FIG. 2, the chuck means 1 d is provided on the elevating lower plate 8 a at three locations evenly arranged in the circumferential direction.

  As shown in FIG. 2 (A), in a state where the cylinder 1e is not in operation, the chuck member 1h is in an open state rotated outward in the radial direction of the pile 3, and in this case, the three chuck members 1h The maximum of the inscribed pile diameter φ1 is about φ1 = about 1000 mm.

  As shown in FIG. 2B, the pile diameter φ1 becomes about φ1 = about 350 mm in the closed state in which the cylinder 1e is operated and the rod 1j is extended to the maximum. Thus, even if the diameter of the pile 3 is different within a certain range due to the rotation of the chuck member 1h inward and outward in the radial direction, the pile 3 can be pulled out.

  The connecting rod 6 is a rod that suspends the second chuck 1b from the bearing plate 4 and is connected to a holding upper plate 9 and a holding lower plate 9a as shown in FIG. The elevating support plate 4a and the pressure bearing plate 4 penetrate and protrude upward, and are fastened to the end of the connecting rod 6 with a double nut 6a. The connecting rods 6 are provided in the circumferential direction, for example, at a required number of four or more.

  The up-and-down upper plate 8 holds the first chuck 1a sandwiched between the up-and-down lower plate 8a and is connected by a rotation support portion 1f therebetween. Further, the holding upper plate 9 and the holding lower plate 9a support the second chuck 1b between the upper and lower sides, and have an outer shape with dimensions larger than the outer shapes of the upper and lower lifting plates 8 and 8a. It has become. These outer shapes may be round or rectangular.

  Below the elevating lower plate 9a is a metal discard plate 1c laid on the bottom of the hole 2a in the ground.

  Hereinafter, the extraction method of the said pile 3 which formed the said extraction apparatus 1 for piles and used it is demonstrated. FIG. 3 shows an example in which the pile 3 is pulled out when the working height L is limited to about 4900 mm under an expressway or a bridge.

  As shown in FIG. 3A, the first chuck 1a is gripped by extending the rod 1j of the cylinder 1e against the head 3a of the pile 3. At that time, the second chuck 1b keeps the chuck member 1h in an open state and keeps it in a gripping release state.

  Next, as shown in FIG. 3 (2), the reaction force is applied to the lifting support plate 4a, and the rod 7c is retracted in the lifting cylinder 7, thereby raising the first chuck 1a and pulling out the pile 3. . This is the pile drawing process.

  When the pull-out of the pile 3 by the first chuck 1a is completed by reaching the predetermined height by the lifting cylinder 7, the chuck cylinder 1e of the chuck means 1d is driven by the second chuck 1b, and the chuck The pile 3 is gripped by the member 1h.

  Thereafter, in the first chuck 1a, the gripping action by the chuck means 1d is released. For this purpose, the rod 1j is retracted by the chuck cylinder 1e, and the chuck member 1h is rotated outward in the radial direction.

  As shown in FIG. 3C, the first chuck 1a is lowered by driving the lifting cylinder 7 and extending the rod 7c. Then, the initial state shown in FIG. So far, it is a pile holding process.

  Next, as shown in FIG. 3 (4), the pile 3 is gripped by the chuck means 1d in the lowered first chuck 1a, the gripping action of the second chuck 1b is released, and the lifting cylinder 7 is moved. By driving, the rod 7c is retracted and the first chuck 1a is pulled up, whereby the pile 3 is pulled out. Thus, the pile drawing-out method and the pile holding step are repeated, and the pile 3 is drawn out from the ground. Thus, on the ground side, there is only the bearing plate 4 and the lifting support plate 4a of the bearing means, and the pulling device 1 for piles is short on the ground, and even if there is a height restriction at the work location, the extraction is performed. There is no obstacle to work.

  The pile pulling device 1 according to the present invention allows the pile to be pulled out little by little even when there is a restriction on the work height on the ground, or when there is a restriction that a large machine cannot enter in space. Drawing work becomes possible, and the work place is not chosen.

1 Pile pulling device, 1a First chuck,
1b Second chuck, 1c Scrap plate,
1d chuck means, 1e chuck cylinder,
1f rotation support, 1g link,
1h chuck member, 1j rod,
1k support shaft, 1m connecting part,
2 ground, 2a hole,
3 piles, 3a head,
4 bearing plate, 4a elevating support plate,
4b hole,
5 Base material,
6 connecting rod, 6a double nut,
7 Lifting cylinder, 7a Bracket,
7b Bracket, 7c Rod,
8 Elevating upper plate, 8a Elevating lower plate,
9 Upper plate for holding, 9a Lower plate for holding.

Claims (4)

In a device that pulls out piles buried in the ground,
A first chuck and a second chuck that are suspended by the ground-side pressure supporting means are provided;
The first chuck and the second chuck are each provided with chuck means for holding the pile by pressing the chuck member against the peripheral wall surface of the pile,
The first chuck is suspended via a lifting cylinder;
The second chuck is suspended from the supporting means at a position below the first chuck via a connecting rod;
Pile pulling device characterized by The bearing means is provided with a hole that allows at least the pile to pass through,
The pulling-out apparatus for piles of Claim 1 characterized by these. The chuck member of the chuck means enters the radial direction of the pile, abuts against the peripheral wall surface of the pile, and grips the pile so that the diameter of the pile can correspond to the size within the range. To rotate in the radial direction,
The pile pulling-out device according to claim 1 or 2, characterized in that. The pile pulling device according to any one of claims 1 to 3, wherein: a) the first chuck is gripped by the head of the pile, and the second chuck is lifted and lowered. Pulling out the pile by raising the first chuck with a cylinder for the pile,
b) a pile holding step of holding the raised pile with a second chuck and releasing the holding action of the first chuck with the lifting cylinder;
Repeating the pile pulling-out step and the pile holding step to pull out the pile embedded in the ground,
A method of pulling out a pile characterized by

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