JP2009203768A - Wooden pile extractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, as for an extracting method for an existing wooden pile buried in the ground, a method for extracting the wooden pile wherein the existing wooden pile can be pulled out easily and efficiently without being damaged. <P>SOLUTION: A wooden-pile extractor 1 is composed at least of a tube body 3 loosely fitted over a buried wooden pile 2 and a holding device 4 provided on the tube body 3 for holding the wooden body in a state that the pile head is covered with the tube body. The extractor 1 is placed on the pile head part of the buried wooden pile 2, and a vertical oscillation by a motion-exciter is transmitted to the extractor. The downward oscillation is transmitted to the pile head through the bottom part (top panel) of the tube body while the upward oscillation is transmitted to the wooden body 2a through the holding device 4, so as to reduce a friction force around the buried wooden pile for pulling it out. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for extracting a wooden pile for extracting an existing wooden pile driven into the ground as needed, and a drawing device used therefor.

Conventionally, in order to pull out a wooden pile buried in the ground, it is certain to dig all the way around the buried wooden pile to the lower end position, but it takes a long time and labor. Therefore, as an example of efficiently cutting the edge of the buried wooden pile, for example, a pipe having a larger inner diameter than the pile is externally fitted to the lower end position of the buried wooden pile while giving vertical vibration to the pipe. A method and an apparatus for pulling out a pile after being driven into the ground are known (see Patent Document 1).
JP 05-272138 A

  However, in the conventional wood pile pulling device, the wood pile driven into the ground is not necessarily driven vertically, but rather is often driven obliquely, so the pipe for cutting the edge with the ground, It is often difficult to drive to the lower end of the buried wooden pile. In addition, there is a method of pulling the pile head portion directly by hooking it with a wire, but the pile head portion is damaged or the peripheral frictional force of the pile is strong and cannot be pulled out. Furthermore, even if an attempt is made to pull out the pile head by applying vibration to the pile head via a wire attached to the pile head, vertical friction in the vertical direction is not transmitted to the pile, so the peripheral frictional force of the pile trunk portion does not change, and the wire It is difficult to pull out. The wooden pile drawing apparatus according to the present invention has been proposed in order to solve such a problem.

  The gist for solving the above-mentioned problems of the method for pulling out a wooden pile according to the present invention is as follows. A cylindrical body loosely fitted to a pile head of an embedded wooden pile, and the cylindrical body provided in the cylindrical body The pulling device for a wooden pile comprising at least a gripping device for gripping a wooden trunk in a state where the pile head is placed on the pile head, the pulling device is installed on the pile head of the buried wooden pile, and the pulling device is vibrated. Transmits vibrations in the vertical direction of the device, transmits downward vibrations to the pile head at the bottom of the cylinder, and transmits upward vibrations to the wooden trunk with the gripping device to transmit the peripheral friction force of the buried wooden pile Is to pull out with reduced.

  Moreover, the gist of the pulling device for a wooden pile according to the present invention is that a cylinder having one end opened so that the pile head of the buried wooden pile is loosely fitted and the other end has a bottom, and the cylinder is the pile head. A vibration transmitting member that is erected upward from the bottom of the cylindrical body in a state of use, and a base is fixed to the outer periphery of the cylindrical body. A gripping device that freely grips a wooden barrel portion located below the opening of the cylindrical body in the use state, and a reciprocating vibration of the vibration generating device with respect to the buried wooden pile is a bottom portion of the cylindrical body Is transmitted downward by the gripping device.

  A plurality of gripping devices are provided at equal intervals in the circumferential direction on the outer periphery of the cylinder, and one gripping device has a base fixed to the bottom side of the cylinder and expands and contracts toward the opening side of the cylinder. One end of the cylinder is rotatably connected to the tip of the cylinder rod, and the other end of the cylinder is positioned below the cylinder in the use state with a fulcrum provided on the opening side of the cylinder. It is composed of a gripping arm portion that swings so as to come into contact with the wood barrel.

  Further, the other end portion of the gripping arm portion has a claw member having a bifurcated claw abutting on the surface of the wooden body and a connecting portion with the other end portion being swingable. One of the claws includes that the gripping device is positioned above the rotation center position of the connecting portion and bites into the wooden body when the gripping device vibrates upward in use.

According to the method for pulling out a wooden pile of the present invention and the pulling device therefor, the wooden head of the buried wooden pile is not strongly gripped, so that the wooden pile is not damaged. In addition, the head of the buried wooden pile is loosely fitted with a cylinder, and the vibration of the seismic device is reliably transmitted by firmly grasping the wooden trunk, so it is possible to easily remove the wooden pile by reducing the peripheral friction force it can.
Conversely, the wooden pile can be driven into the ground by compressing the wooden pile while applying vibration.
Furthermore, since the nail | claw member of a holding | grip apparatus bites into a wooden trunk, the vibration of the up-down direction of a vibration generator can be reliably transmitted to an embedded wooden pile.

  As shown in FIG. 1, the method for pulling out a wooden pile according to the present invention includes a cylindrical body 3 that is loosely fitted to a pile head 2 a of an embedded wooden pile 2, and the cylindrical body 3 provided on the cylindrical body 3. The pulling device 1 is installed on the pile head 2a of the buried wooden pile 2 by a wooden pile pulling device 1 comprising at least a gripping device 4 for gripping the wooden trunk 2b in a state of covering the head 2a. The vertical vibration of a vibration generator (hydraulic vibrator hammer, etc.) not shown in the figure is transmitted to the apparatus 1, and the downward vibration is transmitted to the pile head 2a at the bottom part (a top plate) 3a of the cylindrical body 3. In this method, the gripping device 4 transmits the upward vibration to the wood barrel 2b to reduce the peripheral friction force of the buried wooden pile 2 and pull it out.

  By such a drawing method, the buried wooden pile 2 is vibrated up and down with the vibration of the vibration generator reliably transmitted, and the contact with the surrounding ground is cut off by the vibration of the vibration generator. And the peripheral frictional force which is a supporting force as a friction pile decreases, the pulling device 1 is pulled up, or the pulling device 1 is removed from the pile head of the wooden pile 2 to pull the wooden pile directly. The buried wooden pile 2 can be easily pulled out.

  As a specific example of the drawing device 1 used for such a method of drawing a wooden pile, for example, one end is opened so that the pile head 2a of the buried wooden pile 2 is loosely fitted and the other end is a bottom (or top). Plate) a steel cylinder 3 having a 3a, and a vibration not shown in the figure, standing up from the bottom 3a of the cylinder 3 in a use state where the cylinder 3 is put on the pile head 2a. A plate-shaped steel vibration transmission member 5 having a uniform thickness for transmitting the vibration of the apparatus to the cylinder 3, and a base 4c fixed to the outer periphery of the cylinder 3 and the one end 4d in the use state when the cylinder 4 It comprises a rigid gripping device 4 that freely grips the lower part of the wooden barrel 2b from the opening 3b of the body 3.

  And the reciprocating vibration with respect to the said buried wooden pile 2 of the said vibration generator is reliably transmitted to the downward direction by the bottom part (or top plate) 3a of the said cylinder 3, and the upward direction by the said holding | grip apparatus 4, respectively. is there.

  As shown in FIGS. 1A and 1B, a plurality of gripping devices 4 are provided on the outer peripheral portion of the cylindrical body 3 at equal intervals in the circumferential direction. In this embodiment, three gripping devices 4 are provided. Is a cylinder 4a having a base 4c fixed to the bottom (top plate) 3a side of the cylindrical body 3 and being extensible toward the opening 3b side of the cylindrical body 3, and one end at the tip of a rod 4e of the cylinder 4a. 4f is rotatably connected, and the other end 4d swings around a fulcrum 4g provided on the opening 3b side of the cylindrical body 3 so that the wooden barrel 2b below the cylindrical body 3 is in use. It comprises a gripping arm 4b formed so as to abut.

  As shown in FIG. 2, the other end 4d of the gripping arm 4b has bifurcated claws 6a and 6b that come into contact with the surface of the wooden barrel 2b, and a connecting portion 6c to the other end 4d. For example, there is a claw member 6 which is swingable by pin coupling. One claw 6a of the claw member 6 is located at a position a higher than the rotation center position of the connecting portion 6c when the gripping device 4 vibrates upward in use, and bites into the wooden case 2a. It has become.

With such a wooden pile drawing device 1, the head 3a of the buried wooden pile 2 is covered with the cylinder 3, and the vibration transmission member 5 is gripped by a gripping portion of a vibration generator (not shown). Then, the cylinder 4 is driven hydraulically to swing the gripping arm 4b, and the claw member 6 at the other end 4d is firmly brought into contact with the wooden body 2a.

  Next, the vibration generator is vibrated. Then, the cylinder 3 of the drawing device 1 vibrates in the vertical direction, pushes the pile head 2a downward at the bottom (top plate) 3a, and moves the tree 3 with the cylinder 3 by the gripping arm 4b. The trunk 2 b is pulled up, and the vibration of the cylinder 3 is directly transmitted to the buried wooden pile 2. Since the gripping arm portion 4b has the claw member 6, the one claw 6a bites into the wooden body 2b well and reliably transmits vibration. Therefore, the peripheral frictional force with the ground surroundings of the buried wooden pile 2 is reduced and extinguished. Thus, the buried wooden pile 2 can be easily pulled out.

The front view (A) of the state which mounted the extraction device 1 for wooden piles which concerns on this invention in the pile head of the buried wooden pile 2, and the front of the state which rocks the arm part 4b so that it may pull out, and may hold | grip a wooden pile It is a figure (B). It is a one part enlarged front view of the drawing apparatus 1 for wooden piles of the same invention. It is the top view (A) and bottom view (B) of the drawing apparatus 1 for the same wooden pile.

Explanation of symbols

1 wooden pile drawing device,
2 buried pile, 2a pile head,
2b wooden barrel,
3 cylinder, 3a bottom (top plate),
3b opening,
4 gripping device, 4a cylinder,
4b gripping arm, 4c base,
4d other end, 4e rod,
4f one end, 4g fulcrum,
5 Vibration transmission member,
6 claw member, 6a one claw,
6b The other nail, 6c connecting part.

Claims (4)

A wooden pile pulling device comprising at least a cylinder body loosely fitted to a pile head portion of an embedded wooden pile, and a gripping device that is provided on the cylinder body and grips a wooden trunk in a state where the cylinder body is placed on the pile head portion. By
Installing the pulling device on the pile head of the buried wooden pile, and transmitting the vibration in the vertical direction of the vibration generator to the pulling device;
Transmitting downward vibration to the pile head at the bottom of the cylinder, transmitting upward vibration to the wooden barrel with the gripping device to reduce the peripheral frictional force of the buried wooden pile, and pulling out,
A method for pulling out wooden piles. A cylinder having one end opened and the other end having a bottom so as to loosely fit the pile head of the buried wooden pile;
A vibration transmitting member that is erected upward from the bottom of the cylindrical body in a use state where the cylindrical body is put on the pile head, and transmits vibrations of the vibration generator to the cylindrical body;
A base is fixed around the outer periphery of the cylindrical body, and one end of the cylindrical body includes a gripping device that freely grips a wooden barrel portion located below the opening of the cylindrical body in the use state.
Reciprocal vibration of the vibration generator with respect to the buried wooden pile is transmitted downward by the bottom of the cylindrical body and upward by the gripping device;
A pulling device for wooden piles. A plurality of gripping devices are provided at equal intervals in the circumferential direction on the outer periphery of the cylinder, and one gripping device has a base fixed to the bottom side of the cylinder and is extendable toward the opening side of the cylinder A cylinder and one end portion rotatably connected to the tip of the rod of the cylinder, and the other end portion of the tree in a lower position of the cylinder in the use state around a fulcrum provided on the opening side of the cylinder Consisting of a gripping arm that swings so as to abut the torso,
The wooden pile pulling-out device according to claim 2, wherein: At the other end of the gripping arm, there is a claw member having a bifurcated claw that comes into contact with the surface of the wooden body, and a connecting portion with the other end is swingable. The claw is positioned above the rotation center position of the connecting portion when the gripping device vibrates upward during use, and is configured to bite into the wooden barrel.
The wooden pile pulling device according to claim 3.

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