JPH06102893B2 - Removal equipment for existing concrete piles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing concrete pile removing apparatus for crushing and removing existing concrete piles, piles, etc. (hereinafter simply referred to as concrete piles) remaining in the ground, and in particular, connecting concrete piles. The present invention relates to a concrete pile removing device including a connection removing tool capable of removing a portion.

[0002]

2. Description of the Related Art When dismantling an old building and constructing a new building in its place, it is necessary to remove the existing concrete piles because they interfere with the construction. As an example of this type of removing device, a crushing device for a concrete pile that crushes the end face of the concrete pile and removes the driven pile is known.

In this crushing device, a screw having a crushing blade is provided at the lower end of an auger shaft connected to a rotation driving means, and a guide cap having a cutting blade is provided. As a result, when the auger shaft is driven and lowered, the outer peripheral soil of the concrete pile is excavated by the cutting blade and the end surface of the concrete pile is scraped off by the crushing blade and crushed. At this time, since the crushed concrete fragments are discharged by the screw of the auger shaft,
The concrete pile can be removed.

[0004]

However, the crushing device for concrete piles described above can crush concrete piles with a crushing blade that rotates with an auger shaft, but when concrete piles are connected, the There is a problem that concrete piles cannot be removed. That is, when a long concrete pile is buried in the structure of a building, a plurality of concrete piles are usually connected to each other by using a metal flange at the connecting portion. Therefore, it is possible to crush the upper concrete pile, but when the crushing blade reaches the flange, this metal flange cannot be destroyed, so the crushing work cannot be continued, and the lower concrete pile There was a problem that it would be impossible to remove.

An object of the present invention is to solve the above problems.

[0006]

In the present invention, in order to achieve the above object, a base portion is rotatably attached to a lower end portion of an auger shaft connected to a rotation driving means, and the auger shaft is normally rotated. It rotates in the centripetal direction and passes through the hollow hole of the connection part of the concrete pile, and when the auger shaft rotates in the reverse direction, it rotates in the centrifugal direction and the tip side crushes the peripheral wall of the concrete pile from the inner surface side, and the auger shaft It is provided with a bow-shaped connection removing tool that hooks and removes the connection portion of the concrete pile when rising.

[0007]

With the above structure, when the auger shaft is rotated and lowered, the bow-shaped connecting and removing tool pivots in the centripetal direction and passes through the hollow hole of the connecting portion (metal flange) of the concrete pile, so that the lower portion It can reach the hollow holes of concrete piles. Here, when the auger shaft is reversely rotated,
The connection removing tool rotates in the centrifugal direction and the tip side crushes the peripheral wall of the concrete pile from the inner surface side. For this reason, when the auger shaft is raised, the bow-shaped connection removing tool that has rotated in the centrifugal direction hooks the connection portion (metal flange) of the concrete pile to separate the concrete pile and the connection portion of the concrete pile. Therefore, the connection portion of the concrete pile can be taken out by further raising the auger shaft. In addition, after taking out the connection portion of the concrete pile, the auger shaft may be rotated and lowered again to crush the lower concrete pile with the crushing blade.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an existing concrete pile removing device.

In the existing concrete pile removing device, a drive device 4 is provided on a leader mast 2 of a crawler crane 1, and the drive device 4 has a crushing blade 10 and a connection removing tool 1.
1 is attached to the casing rotating mechanism 6 to which the auger shaft 5 and the casing 7 are attached. The existing concrete piles P buried in the ground are crushed and the connecting portion (flange) F ( (See FIGS. 4 to 8)
Can be removed.

The drive unit 4 contains a motor and a speed reducer in a main body case 4a. And body case 4
A wire 3 is stretched between the upper portion of a and the headstock 2a of the leader mast 2, and a guide portion 4b is provided on a side portion of the main body case 4a. Thereby, the drive device 4 is
By winding and unwinding the wire 3, the leader mast 2
It is movable up and down along the guide rail 2b. Two
Reference numeral c is an antivibration tool for the casing 7.

The auger shaft 5 has a body case 4 at the upper end.
It is connected to the speed reducer in a, and screw vanes 5a are provided on the outer periphery for discharging the fragments of the crushed concrete piles, the chips of the reinforcing bars of the concrete piles, and the like.
A rod 8 is detachably attached to the lower end of the auger shaft 5. The lower end of the rod 8 has a pair of guide members 9 for guiding the descent of the auger shaft 5,
9 is fixed by welding.

2, the lower surface of the tip side 10a of the crushing blade 10 is substantially parallel to the end surface P1 of the concrete pile P, and the end surface P1 is cut to crush and rebar is cut. Also serving as a cutter, the concrete pile P can be crushed while cutting the reinforcing bars exposed at the time of cutting the end face P1. The screw blade 5a is continuously provided on the upper portion of the crushing blade 11, and the connection removing tool 11 is provided on the lower portion.
Two are provided.

As shown in FIG. 3, the connecting / disconnecting tool 11 has an arcuate shape and has a sharp tip 11a, and a hole is formed in the base 11c shown in FIG. It is designed to be freely movable. That is, the pair of holding portions 12 are fixed to the outer peripheral surface of the rod 8 by welding. A bolt hole for inserting the bolt 13 is provided at the center of the pair of holding portions 12.
Further, a stopper 14 that restricts the rotation of the connection removing tool 11 is formed at one end. When the connection removing tool 11 is mounted, the base portion 11c of the connection removing tool 11 is fitted into the groove 12a between the pair of holding portions 12, and the bolt 13 is rotatably inserted into the hole of the base portion 11c. The connection removing tool 11 is rotatably attached to the rod 8 by being screwed into the bolt holes of the holding portion 12. Accordingly, when the connection removing tool 11 is converged, the connection removing tool 11 is fitted into the guide groove 12a, and at this time, the outer peripheral surface of the connection removing tool 11 (the outer surface on the radius from the axis of the auger shaft 5).
However, it is located inward of the inner peripheral surface of the hollow hole P2 of the concrete pile P and is not in contact with the inner peripheral surface (inner diameter W1) of the flange F. Further, in a state where the outer surface of the connection removing tool 11 contacts the stopper 14 of the holding portion 12 and the connection removing tool 11 is expanded, the outermost end of the tip end side 11a is enlarged until it reaches the outer peripheral portion of the concrete pile P. Then, the peripheral wall P3 of the concrete pile P is crushed from the inner surface side. The connection removing tool 11 and the crushing blade 10 are firmly fixed to the rod 8. When the upper part of the replaceable rod 8 is connected to the auger shaft 5, the crushing blade 10 is screw blades 5a, 5b. It is designed to be linked to.

The casing rotating mechanism 6 includes a body portion 6a.
The main body 6a including a motor is fixed to the drive device 4 and the lower rotary portion 6b is rotated.

The casing 7 has a diameter larger than the outer diameter W2 of the concrete pile P, and the upper side thereof is connected to the rotating portion 6b, which is interlocked with the rotation of the rotating portion 6b. As shown in FIGS. 2 and 3, a digging blade 7a is provided at the lower end of the casing 7, so that the soil around the concrete pile P is digged when the casing 7 rotates. There is.

Next, the concrete pile crushing process by the existing concrete pile removing device will be described.

In this example, the case of removing the two concrete piles Pa and Pb connected by using the metal flange F will be described.

First, the auger shaft 5 to which the connection removing tool 11 and the crushing blade 10 are attached via the rod 8 is built on the head of the concrete pile Pa remaining in the ground, and as shown in FIG. -The casing 7 is inserted around the outer circumference of the pile Pa.

Then, when the auger shaft 5 is lowered while being rotated in the forward direction, the concrete pile P on the upper portion is crushed by the crushing blade 10.
a is crushed. Then, as shown in FIG. 5, the guide member 9
When the crushing blade 10 has passed through the flange F and has reached above the flange F, the connection removing tool 11 is rotated in the centripetal direction and is in a converged state. Reach the hollow hole P2 of the pile Pb. At this time, the crushing may be temporarily stopped in the vicinity of the flange F, but since the length of the concrete pile Pa is normally known in advance, the crushing blade 10 is stopped when the crushing blade 10 does not contact the flange F, It is located on the upper surface of F.

Here, when the auger shaft 5 is rapidly rotated in the reverse direction, as shown in FIG. 6, the connection removing tool 11 rotates in the centrifugal direction, and the tip side 11a is the lower peripheral wall of the concrete pile Pa. It collides with P4 and crushes this concrete pile Pa from the inner surface side. Therefore, the lower concrete pile Pb and the flange F are in a separable state.

Then, when the auger shaft 5 is raised as shown in FIG. 7, the flange F is hooked by the enlarged connection removing tool 11 and removed from the lower concrete pile Pb. Then, the auger shaft 5 is lifted to raise the flange F.
Discard.

After that, when the auger shaft 5 is lowered again while rotating in the forward direction, the lower concrete pile Pb can be crushed by the crushing blade 10 as shown in FIG. 8, and two concretes can be crushed. The piles Pa and Pb can be removed.

In the above embodiment, the auger shaft 5
The case where the crushing blade 10 and the connection removing tool 11 are attached to the rod 8 has been described, but only the crushing blade 10 or the connection removing tool 11 is fixed to this rod 8 to replace the crushing blade 10 and the connection removing tool 11. You may do it. in this case,
First, the upper concrete pile Pa is removed by the crushing blade 10, and then the crushing blade 10 is lifted to replace the connection removing tool 11. Next, the connection removing tool 11 is lowered, and when it reaches the lower side of the flange, the auger shaft is reversely rotated, and the separated flange F is hooked and discarded. After this,
The crushing blade 10 is attached again to crush and remove the lower concrete pile Pb.

[0024]

As described above, according to the present invention, the peripheral wall of the concrete pile can be crushed from the inner surface side and the connecting portion of the concrete pile can be hooked and removed. Therefore, in the case of crushing a plurality of concrete piles connected by a metal connecting part that cannot be removed by a crushing blade, the auger shaft is rotated and lowered, and after reversely rotated at a predetermined position, it is raised. There is an excellent effect that these concrete piles can be removed by a simple process.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view of a connection removing tool.

FIG. 3 is a back view of the connection removing tool.

FIG. 4 is an explanatory view showing a crushed state of an upper existing concrete pile.

FIG. 5 is an explanatory view showing a state immediately before the end of the crushing of the existing concrete pile on the upper side.

FIG. 6 is an explanatory view showing a state where the existing concrete pile at the bottom is crushed by the connection removing tool.

FIG. 7 is an explanatory view showing a state in which the connecting portion between the existing concrete piles is hooked and raised by the connection removing tool.

FIG. 8 is an explanatory view showing a state in which the existing concrete pile at the lower portion is crushed.

[Explanation of symbols]

 1 Crawler Crane 2 Leader Mast 4 Rotational Drive Means 5 Auger Shaft 11 Connection Removal Tool 11c Base P Concrete Pile P2 Hollow Hole P4 Peripheral Wall F Connection

Claims (1)

[Claims] 1. A base portion is rotatably attached to a lower end portion of an auger shaft connected to a rotation driving means, and when the auger shaft is normally rotated, the auger shaft is rotated in a centripetal direction to open a hollow hole in a connection portion of a concrete pile. As described above, when the auger shaft rotates in the reverse direction, the tip side crushes the peripheral wall of the concrete pile from the inner surface side by rotating in the centrifugal direction, and the connecting portion of the concrete pile is hooked and removed when the auger shaft rises. An existing concrete pile removing device equipped with a connection removing tool.