JPH08120671A - Remover of underground pile - Google Patents

Abstract

PURPOSE: To easily remove a pile by providing a casing driver for bearing a casing formed by projection a cutter to the inside a cylinder on the upper part of the pile in a revolvable and press-fit manner and a rubble remover for taking out the treated pile. CONSTITUTION: A casing driver is provided right above a pile to be removed. Then, a driving cutter 3a is provided to the lower edge, and a casing 3 mounting a cutter 2 to the downward inside thereof is provided to the casing driver. Then, the casing driver is driven, and when revolution and pressure are applied to the casing 3, reinforcing bars 10 of the pile 1 are cut off with the cutter 2 to smash the whole pile to pieces. After the pile 1 is removed to the extent of providing no obstacle to the original work, a hammer glove is lowered to the inside of the casing 3 to move the remains of the pile 1 or earth and sand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing underground piles, and more particularly to a device for removing reinforced concrete piles.

[0002]

2. Description of the Related Art Generally, when constructing an underground tunnel, for example, an underground iron or a large drainage channel, a structure which becomes an obstacle may be buried in the route.

When deciding a course, it is of course necessary to avoid designing existing structures such as foundations of buildings in advance, but in the case where unnecessary piles are buried in the ground. Not a few. Therefore, the route of the underground tunnel is generally determined on the premise of removing such unnecessary piles.

Therefore, conventionally, when removing unnecessary piles, etc., the periphery of the piles has been excavated and then pulled out.

[0005]

However, according to the above-mentioned conventional method, it is difficult to remove the existing building when the existing building is in the surrounding area because it is necessary to excavate the surrounding area of the pile or the like. In addition, piles, etc., should be removed to a depth that does not hinder the underground tunnel.
When pulling out by the above method, all of the piles and the like must be completely pulled out, so that considerable work is required to pull out piles with a deep depth.

Therefore, the present applicant has devised a device as shown in FIG. FIG. 10 is a plan view, and a plurality of reinforcing bars 10 are contained inside the pile 1 to be removed. First, the cylindrical casing 30 is press-fitted at a position displaced from the center of the pile 1 while rotating. A digging cutter 31 is provided at the tip of the casing 30 and advances while cutting the reinforcing bar 10 inside together with the pile 1. After cutting to the required depth in this way, the casing 30 is pulled out, the position is changed again, and cutting is performed. That is, the two circles whose centers are offset are cut out.

According to this method, together with the pile 1, the reinforcing bar 10
Can also be cut and is easy to remove. At this time, the debris in the casing 30 is removed by a grab hammer, but since all the reinforcing bars 10 cannot be completely cut, there is a problem that a special reinforcing bar cutting machine must be used.
In addition, there is a problem in that work efficiency is lacking because three processes, a process of press-fitting the casing 30 twice and a process of treating debris are required.

The present invention has been made in view of the above matters, and it is a technical object to provide an underground pile removing device capable of completely removing piles in one step.

[0009]

In order to solve the above technical problems, the present invention has the following constitution. That is, in the structure of claim 1, the device is a device for removing the pile 1 buried in the ground, the casing 3 having the cutter 2 protruding from the inside of the cylinder, and the casing 3 for the casing 3. Casing driver 1 that supports rotation and press fit on top
1 and debris removing means 13 for taking out the treated pile in the casing 3. And casing 3
Is pressed into the periphery of the pile 1 while rotating, and the pile 1 is broken by the cutter 2, and then the remains of the pile 1 are removed from the casing 3.

Here, the pile 1 represents a structure buried in the ground, for example, a concrete column having a reinforcing bar inside. The diameter of the pile 1 that can be treated depends on the diameter of the casing 3, but is preferably within a few meters for ease of treatment.

The cutter 2 is a hard tooth such as high speed steel, and its shape can be formed like a flat tooth or a canine tooth. A single bed or a plurality of beds can be provided on each bed welded to the inner surface of the casing 3.

The casing driver 11 may be, for example, one that secures the periphery of the casing 3 by a plurality of inclined rollers, and is pressed into the ground while rotating the casing.

The debris removing means 13 may be, for example, a grab or a bucket suspended from a crane, and in short, any means capable of discharging the debris remaining inside the casing 3 to the outside may be used.

According to a second aspect of the present invention, there is provided a device for removing a pile 1 buried in the ground, which comprises a casing 3 having a movable cutter 4 projecting forward and backward in a cylinder, and the casing 3. A casing driver 11 for supporting the pile 3 on the upper part of the pile 1 so as to be rotatable and press fit, and a debris removing means 13 for taking out the treated pile in the casing 3.

After the casing 3 is rotated around the pile 1 and press-fitted to a predetermined depth, the movable cutter 4 is projected and the casing 3 is rotated to cut the pile 1 with the movable cutter 4 and then cut. The removed pile 1 is removed from the casing 3.

Here, the movable cutter 4 can be moved back and forth by hydraulic pressure. That is, the bed is provided with a hydraulic cylinder and a piston fitted in the hydraulic cylinder, and a cutter is attached to the piston. On the other hand, a hydraulic power source is installed on the ground and connected to the cylinder by a high pressure hose. The cutter may be configured to be moved forward and backward by applying a hydraulic pressure from a hydraulic pressure source.

It is preferable that a plurality of cutters 2 are provided on the inner surface of the casing 3, for example, about 4 to 12 cutters. Further, it is desirable to change the amount of protrusion of each of these cutters 2. This is for facilitating the crushing of the pile 1 by cutting the inside of the casing step by step.

[0018]

In the construction of claim 1, the casing 3 is mounted on the casing driver 11 and set right above the pile 1, and rotation and pressure are applied. Then, the cutter 2 provided in the casing 3 grinds the whole of the pile 1 while cutting the reinforcing bars of the pile 1 and advances.

In this way, the pile 1 is removed to the required depth, that is, the depth at which the pile 1 does not hinder the original construction. Thereafter, the debris removing means 13, such as a grab, discharges the debris and earth and sand inside the casing 3.

In the second aspect of the invention, rotation and pressure are applied to the casing 3 installed right above the pile 1 to be removed. At this time, the movable cutter 4 is retracted and the pile 1 is
Avoid touching. By rotating the pile 1, the sand around the pile 1 is removed by the cutter 2.

In this way, the pile 1 is lowered to the desired depth. Here, the movable cutter 4 is projected to cut off the pile and the internal reinforcing bar. In this method, it is not necessary to crush the entire pile 1 and it can be efficiently removed.

[0022]

【Example】

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS.

This device is for removing the pile 1 buried in the ground, and comprises a cylindrical casing 3 and a casing driver 11 for press-fitting the casing 3 around the pile 1. On the other hand, an 80-ton class crane 12 is installed on the ground, and a hammer grab 13 for removing soil is suspended.

The casing driver 11 is adapted to grip the outer periphery of the pile 1 so that it can be pressed into the ground while rotating the pile 1. The casing driver 11 is connected to the crane 12 by a bar 14 so that the casing driver 11 does not rotate. A digging cutter 3a is provided around the lower edge of the casing 3. Also,
The cutter 2 is attached to a lower inner surface of the casing 3 at a total of four places.

A plurality of cutters 2 are attached to a bed 2a welded to a casing 3. Bed 2
The a is firmly supported by triangular stays 2b provided above and below and triangular stays 2c provided on the side surfaces of the bed 2a.

Then, as shown in FIG. 3, the cutters 2 provided at the four places are provided with steps at their mounting depths. Further, as shown in FIG. 2, the cutters 2 at the four locations are different in protrusion length. That is, the cutter 2 located at the bottom is projected most, and the projection length of the cutter 2 located at the top is short.

When removing the pile 1 buried in the ground by the above-mentioned device, first, the casing driver 11 is installed right above the pile 1 to be removed. Then, the casing 3 is set in the casing driver 11, and rotation and pressure are applied. Then, as shown in FIG. 2, the cutter 2 cuts the reinforcing bars 10 of the pile 1 and crushes the whole to proceed.

Thus, the required depth, that is, the pile 1 is removed to the extent that it does not hinder the original construction. After this, the hammer glove 13 is lowered into the casing 3 to discharge the debris and earth and sand inside.

In this embodiment, the outer diameter of the casing is 1.5 meters, the diameter of the pile 1 is 1 meter, and the depth of the reinforcing bar 10 is 15 centimeters from the surface of the pile 1. <Second Embodiment> A second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the pile 1 is removed by crushing it from the top, but in this embodiment, the pile 1 is cut at a required position. Inside the pile 1, in addition to the fixed cutter 2 described above, a movable cutter (copy cutter)
4 is projected so that it can move forward and backward. This movable cutter 4
It is provided on a bed 4a in which a hydraulic cylinder is installed, and can be retracted in the horizontal direction. A hydraulic pressure is applied to the bed 4a by a high pressure hose 4b, and the high pressure hose 4b connected to a hydraulic pressure source 40 on the ground is connected to a connector 4c.
It is connected so that it can be moved freely.

When the delivery pressure of the hydraulic pressure source 40 is increased, the movable cutter 4 is projected, and when the hydraulic pressure is reduced, the movable cutter 4 is retracted. As shown in FIG. 6, two movable cutters 4 are provided facing each other, and the other fixed cutters 2 are one.
0 is provided.

When removing the pile 1 buried in the ground using the above-mentioned device, first, the casing driver 11 is installed right above the pile 1 to be removed. Then, the casing 3 is set in the casing driver 11, and rotation and pressure are applied. At this time, the movable cutter 4 is retracted so as not to touch the pile 1. By rotating the pile 1, the sand around the pile 1 is removed by the cutter 2.

In this way, the pile 1 is lowered to a desired depth (FIG. 7). Here, the delivery pressure of the hydraulic pressure source 40 is increased to project the movable cutter 4 (FIGS. 6 and 8). The pile 1 is further rotated to cut the pile and the reinforcing bar 10 inside. In this method, it is not necessary to crush the entire pile 1 and it can be efficiently removed (FIG. 9).

[0034]

According to the present invention, the pile can be removed without excavating the periphery of the pile largely, and even if there is a reinforcing bar in the pile, it can be reliably cut with a cutter.

Further, since the pile can be cut at a required depth without breaking it, the working efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a casing according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of this casing.

FIG. 3 is a vertical sectional view of this casing.

FIG. 4 is a schematic view showing a construction situation of the present invention.

FIG. 5 is a vertical sectional view of a casing according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of this casing.

FIG. 7 is a cross-sectional view showing a state in which a casing is press-fitted around a pile.

FIG. 8 is a cross-sectional view showing a state in which the pile is cut by the cutter of the casing.

FIG. 9 is a cross-sectional view showing a state in which the pile is cut.

FIG. 10 is a cross-sectional view of a construction situation in the development process of the present invention.

[Explanation of symbols]

 1 ・ ・ Pile, 2 ・ ・ Cutter, 3 ・ ・ Casing, 4 ・ ・ Movable cutter 11 ・ ・ Casing driver, 13 ・ ・ Hammer grab 13.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Yuri 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (3)

[Claims] 1. A device for removing a pile 1 buried in the ground, comprising a casing 3 having a cutter 2 projecting from the inside of a cylinder, and rotating and press-fitting the casing 3 on the upper part of the pile. An underground pile removing device comprising: a casing driver 11 that supports the pile and a debris removing unit 13 that takes out the treated pile in the casing 3. 2. A device for removing a pile buried in the ground, which comprises a casing in which a movable cutter is projected in a cylinder so that the movable cutter can advance and retreat, and the casing is rotated and press-fitted on an upper portion of the pile. An underground pile removing device comprising a casing driver that supports the pile and a debris removing unit 13 that takes out the treated pile in the casing. 3. The underground pile removing device according to claim 1 or 2, wherein the debris removing means 13 is a grab.