JP6708848B2 - Pile removal machine and pile removal method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile removing machine for extracting an existing pile buried in the ground when rebuilding a building structure or the like, and a pile removing method.

Buildings such as buildings and condominiums have piles embedded in the ground to support their loads. When rebuilding these building structures, it is necessary to remove the existing embedded piles. Conventionally, in order to remove the existing pile, the existing pile was crushed and taken out, or the existing pile was pulled out and removed with a wire.

In Patent Document 1, when a long existing pile is pulled out, after embedding a cylindrical casing around the existing pile, the casing is temporarily pulled out by the main wire hook 19A, and a wire loop is hung on the tip of the casing. Hang the other end of the wire on the sub wire hook 19B. Then, the casing is returned to the ground, the loop of wire is hung on the upper part of the existing pile, and only the casing is pulled out by the main wire hook 19A. After that, the other end of the wire hung on the existing pile is hung from the sub wire hook 19B to the main wire hook 19A and pulled up to the middle, and after cutting and removing the existing pile that has come out on the ground, the wire loop is again attached to the existing pile. The method of pulling up the casing by hanging it on the upper part of is described.

Patent Document 1: Japanese Patent Laid-Open No. 2012-112149

However, the construction method described in Patent Document 1 hangs the other end of the wire on the sub wire hook 19B when the wire is hung on the upper part of the existing pile in the ground, and the other end of the wire when the existing pile is pulled out. There is a problem that it takes time and effort to change the sub wire hook 19B from the main wire hook 19A. In addition, there is a possibility that an operator may be pulled into the ground during this replacement.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and pull out existing piles efficiently and safely.

In order to solve the above problems, the present invention is a pile removing machine for extracting an existing pile buried in the ground,
With a leader that can stand almost vertically from the surface of the earth,
A first sheave and a second sheave provided at one end of the leader,
A guide sheave that the first sheave supports via a wire, holds the existing pile and pulls it out,
A speed reducer for supporting the second sheave through a wire, burying the casing in the ground, and pulling it from the ground;
Equipped with
The leader has a first rail and a second rail from the one end to the other end, and the guide sheave is slidably fitted to the first rail and slidable on the second rail. The present invention provides a pile removing machine characterized in that the speed reducer is fitted to the pile removing machine.

With this configuration, the existing pile can be pulled out efficiently and safely.

The guide sheave may have a structure in which a wire is pulled by a pulley.

With this configuration, the pulling force can be increased and the heavy existing pile can be pulled out.

The position of the guide sheave and the position of the speed reducer may be changed by rotating the leader standing upright with one end facing upward in a substantially horizontal direction.

With this configuration, after pulling out the casing, it is possible to pull out the existing piles by using the same leader.

Further, in order to solve the above problems, the present invention is a pile extracting method for extracting an existing pile buried in the ground,
A casing embedding step of embedding the casing held by the reducer in the ground around the existing pile,
A casing pulling out process of pulling out the casing from the ground by pulling up the speed reducer,
A pile withdrawing step of pulling out the existing pile with the guide sheave,
The guide sheave fitted to the substantially vertical standing leader from the ground surface to the top portion slides along the leader and fits to the second rail provided from the ground surface to the top portion of the leader. The speed reducer described above slides along the leader to provide a method for extracting a pile.

With this configuration, the existing pile can be pulled out efficiently and safely.

The guide sheave may have a structure in which a wire is pulled by a pulley.

With this configuration, the pulling force can be increased and the heavy existing pile can be pulled out.

Between the casing withdrawing step and the pile withdrawing step, the leader may be rotated in a substantially horizontal direction to perform a replacement step of replacing the position of the guide sheave and the position of the speed reducer with each other.

With this configuration, after pulling out the casing, it is possible to pull out the existing piles by using the same leader.

With the pile removing machine and the pile removing method of the present invention, the existing piles can be extracted efficiently and safely.

It is a figure explaining the pile removing machine in Example 1 of this invention. It is a figure explaining the cross section of the leader in Example 1 of this invention. It is a figure explaining a casing burying process and a casing pulling-out process among the pile pulling-out methods in Example 1 of the present invention. It is a figure explaining a position change process and a pile pulling-out process among the pile pulling-out methods in Example 1 of the present invention. It is a figure explaining a position change process and a pile pulling-out process among the pile pulling-out methods in Example 2 of the present invention.

Example 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a pile removing machine according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating a cross section of the leader according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating a casing burying step and a casing pulling step in the pile extracting method according to the first embodiment of the present invention. FIG. 4 is a diagram for explaining the position changing step and the pile pulling-out step in the pile pulling-out method according to the first embodiment of the present invention.

(Pile removal machine)
In the first embodiment of the present invention, as shown in FIG. 1, an existing pile P buried in the ground is pulled out by a pile removing machine 10 equipped with a telescopic crawler 7 that can be moved by a caterpillar and is easy to assemble. Is. The pile removing machine 10 supports the leader 1 standing upright at the tip of the telescopic crawler 7 rotatably in the horizontal direction. The leader 1 serves as a pillar for embedding and extracting the casing 4 and for extracting the existing piles P. The first sheave 5 and the second sheave 6 are supported on one end which is the top portion of the leader 1, and the other end of the leader 1 is supported on the ground. The first sheave 5 supports the guide sheave 2 via a rope, and the second sheave 6 supports the speed reducer 3 via another rope.

Further, the positions of the first sheave 5 and the guide sheave 2 and the positions of the second sheave 6 and the speed reducer 3 are provided at horizontal positions facing the leader 1, and the leader stands substantially vertically. By rotating 1 in a substantially horizontal direction, the positions of the first sheave 5 and the guide sheave 2 and the horizontal positions of the second sheave 6 and the speed reducer 3 can be changed. As a result, as will be described later, it is possible to pull out the casing 4 and the existing piles P by one telescroller 7 with high efficiency.

In the first embodiment, the positions of the first sheave 5 and the guide sheave 2 and the positions of the second sheave 6 and the speed reducer 3 are provided at horizontal positions facing the reader 1, but not necessarily. The present invention is not limited to this and can be changed as appropriate. For example, the positions of the first sheave and the guide sheave 2 and the positions of the second sheave and the speed reducer 3 may be provided at horizontal positions that do not face the reader 1 and have a predetermined angle.

Further, although the pile punching machine 10 using the telescopic crawler is used in the first embodiment, it is not necessarily limited to this and can be appropriately changed. For example, a pile removing machine using a crawler crane may be used.

The guide sheave 2 has a structure in which the wire is pulled by multiple pulleys, and a high pulling force can be exerted by cooperating with the multiple pulleys provided in the first sheave 5. The guide sheave 2 is provided with a hook for suspending the rope or the pile cap, and the rope or the pile cap supported by the hook can hold the existing pile P to pull out the heavy existing pile P. The speed reducer 3 also includes a multi-pulley, and can hold the heavy cylindrical casing 4 and embed it in the ground while rotating. Further, the speed reducer 2 can raise the casing 4 embedded in the ground to the ground.

The existing pile P buried in the ground has a diameter of approximately 150 mmφ to 500 mmφ and a length of 6 m to 22 m, and the material is cement (PC pile), pine (pine pile), steel pipe (steel pipe pile), or the like. is there. The casing 4 has a cylindrical shape, and its diameter and length are selected so that it can be embedded in the ground around the existing pile P. That is, a plurality of casings 4 are joined by bolts so that the inner diameter of the casing 4 is larger than the diameter of the existing pile P and the length thereof is longer than the length of the existing pile P.

The reader 1 is provided with two pairs of rails, that is, a first rail 1A and a second rail 1B from one end to the other end. When the leader 1 stands up substantially vertically from the ground surface, the first rail 1A and the second rail 1B are connected to the leader 1 from the other end supported by the ground surface to the top portion which is one end of the leader 1. Stretch along. As shown in FIG. 2, the guide sheave 2 is slidably fitted to the first rail 1A and is movable from the ground surface to the top portion of the leader 1. The speed reducer 3 is slidable on the second rail. It is possible to move from the ground surface to the top part of the reader 1 by fitting. The guide sheave 2 or the speed reducer 3 can be moved along the first rail 1A or the second rail 1B by winding up or rewinding the wire with the telescopic crawler 7.

If the guide sheave 2 is slidably fitted to the first rail 1A and does not move up and down along the leader 1, the guide sheave 2 may be shaken by the wind or sway, which is dangerous for workers. However, since the guide sheave 2 is slidably fitted on the first rail 1A and moves up and down along the leader 1, the positioning when pulling out the existing pile P is easy, and the existing pile P is straightened. Since it can be pulled out, work can be carried out efficiently and safely.

Similarly, if the speed reducer 3 is slidably fitted to the second rail 1B and does not move vertically along the leader 1, the speed reducer 3 may be shaken by the wind or sway, which is dangerous for workers. However, since the speed reducer 3 is slidably fitted to the second rail 1B and moves up and down along the leader 1, positioning when the casing 4 is embedded in the ground or pulled out is easy, Moreover, since the casing 4 can be straightly embedded or pulled out, the work can be performed efficiently and safely.

(Pile removal method)
Next, the pile-pulling method in Example 1 will be described. First, a casing preparation step is performed to join a plurality of divided casings and prepare a cylindrical casing 4 having an excavating blade at the lowermost end. More specifically, as shown in FIG. 1, there is prepared a telescopic crawler type pile removing machine 10 that can move a caterpillar and is easy to assemble. In this telescopic crawler type pile removing machine 10, a plurality of casings 4 are joined by a crane and suspended by a speed reducer 3 (a plurality of casings 4 in FIG. 1 are not joined). The speed reducer 4 moves along the leader 1, rotates the casing 4, and digs the soil with the digging blade provided at the lowermost end to embed it in the ground. The joined casings 4 are fixed by bolts so that they can be removed and added.

An existing pile P is buried in the ground. The target existing pile P in the present invention has a diameter of approximately 500 mmφ to 1800 mmφ and a length of 6 m to 22 m, and the material thereof is cement (PC pile), pine (pine pile), steel pipe (steel pipe pile), or the like. The casing 4 is selected according to the diameter and length of the existing pile. That is, the casing 4 having an inner diameter larger than the diameter of the existing pile P and a length corresponding to the length of the existing pile P is prepared. And the existing pile P excavates the soil so that the head can be seen.

The number of casings 4 to be joined can be appropriately selected depending on the length of the existing piles P and the like. For example, the number may be one or two or more. In addition, in the casing embedding step, the casings 4 can be sequentially added according to the length of the existing piles P.

Next, a casing embedding step of embedding the casing 4 in the ground so as to be located around the existing pile P is executed. As shown in FIG. 3A, the casing 4 is positioned and lowered around the existing pile P, and the casing 4 is rotated by the speed reducer 3 to excavate the soil by the excavating blade to embed it in the ground. Then, as shown in FIG. 3B, a new casing 4 is added to the uppermost portion of the casing 4 in accordance with the length of the existing pile P to proceed with embedding. The addition of the casing 4 is performed when the long casing 4 cannot be embedded at once because the length of the existing pile P is long like a cast-in-place pile. That is, when the length of the existing pile P is short, it is not necessary to add the casing 4.

Then, as shown in FIG. 3C, when the casing 4 is embedded deeper than the existing pile P while the casing 4 is being rotated by the speed reducer 3, the casing withdrawing step is executed. In the casing pulling-out step, the reducer 3 rises along the leader 1 to pull out the casing 20 from the ground (see FIG. 3D). As a result, the existing pile P is released from earth pressure, and the existing pile P can be easily pulled out.

Next, a wire hanging process is performed. That is, as shown in FIG. 4A, a wire is hooked on the lowermost end of the casing 4 and embedded in the ground again, and the tip of the wire is hooked on the existing pile P. Then, the casing 4 is pulled out while one end of the wire is hooked on the existing pile P (see FIG. 4B).

Then, a pile extraction process is performed. That is, by holding the other end of the wire whose one end is hooked on the existing pile P by the guide sheave 2 and raising the guide sheave 2 along the leader 1, the existing pile P can be pulled straight and quickly and safely. It can be pulled out (see FIG. 4(c)). At this time, since the guide sheave 2 has a structure in which the wire is pulled by the multiple pulleys, the pulling force can be increased to pull out the heavy existing pile P.

At this time, in the first embodiment, the position changing step is executed after the casing drawing step and before the pile drawing step. In the position changing step, the leader 1 standing upright vertically is rotated in a substantially horizontal direction so that the position of the guide sheave 2 supported by the first sheave 5 via the wire and the position of the guide sheave 2 supported by the second sheave 6 via the wire. The position of the speed reducer 3 is changed so that the guide sheave 2 is located at a position where the existing pile P can be pulled out straight. As a result, the casing drawing process can be smoothly and smoothly transferred to the pile drawing process without moving the telescopic crawler 7.

In the first embodiment, the position changing process is executed after the casing drawing process and before the pile drawing process, but the position changing process is not necessarily limited to this and can be changed as appropriate. For example, the casing drawing process and the pile drawing process may be performed by using two telescopic crawlers and a leader without performing the position changing process. However, when pulling out the existing pile P in a narrow place, it is extremely effective to execute the position changing process using one telescopic crawler and leader.

As described above, in the first embodiment of the present invention, a pile extracting machine for extracting an existing pile buried in the ground,
With a leader that can stand almost vertically from the surface of the earth,
A first sheave and a second sheave provided at one end of the leader,
A guide sheave that the first sheave supports via a wire, holds the existing pile and pulls it out,
A speed reducer for supporting the second sheave through a wire, burying the casing in the ground, and pulling the casing from the ground.
Equipped with
The leader has a first rail and a second rail from the one end to the other end, and the guide sheave is slidably fitted to the first rail and slidable on the second rail. The existing pile can be pulled out efficiently and safely by the pile removing machine characterized by fitting the speed reducer to the.

In addition, it is a pile-pulling method to pull out existing piles buried in the ground,
A casing embedding step of embedding the casing held by the reducer in the ground around the existing pile,
A casing pulling out process of pulling out the casing from the ground by pulling up the speed reducer,
A pile withdrawing step of pulling out the existing pile with the guide sheave,
The guide sheave fitted to the substantially vertical standing leader from the ground surface to the top portion slides along the leader and fits to the second rail provided from the ground surface to the top portion of the leader. According to the pile removing method characterized in that the speed reducer slides along the leader, the existing pile can be extracted efficiently and safely.

The second embodiment is different from the first embodiment in that the head of the existing pile P is gripped by the pile cap instead of hooking the wire on the existing pile P when pulling out the existing pile P. Example 2 will be described with reference to FIG. FIG. 5: is a figure explaining the position change process and the pile pulling-out process in the pile pulling-out method in Example 2 of this invention.

In the second embodiment, the above-mentioned wire hanging step is not performed, and the head of the existing pile P is gripped by the pile cap 19 and the pile drawing step is executed.

The pile cap 19 is a chucking mechanism for gripping the heads of the existing piles P, has a substantially cylindrical shape with an open bottom, and has a plurality of cylindrical tips (lower part in FIG. 5) provided inside. It is configured to grip the existing pile P by the claw standing up (falling inward).

After the casing drawing process and the position changing process, the pile cap 19 holds the exposed head of the existing pile P on the ground to execute the pile drawing process. As a result, it is possible to prevent an accident in which the worker is pulled into the ground when the wire is hooked on the existing pile P.

Also in the second embodiment, the guide sheave 2 is slidably fitted to the first rail 1A and vertically moved along the leader 1, so that the existing pile P can be easily positioned and pulled straight. Since the existing piles P can be pulled out, work can be carried out safely without being affected by the wind.

Similarly, the speed reducer 3 is slidably fitted to the second rail 1B and moves up and down along the leader 1 to facilitate positioning when the casing 4 is embedded in the ground or pulled out. Moreover, since the casing 4 can be embedded or pulled out straight, the work can be safely advanced without being affected by the wind.

INDUSTRIAL APPLICABILITY The pile removing machine and the pile removing method according to the present invention can be widely used in the field of existing pile extracting.

1: Leader 1A: 1st rail 1B: 2nd rail 2: Guide sheave 3: Reducer 4: Casing
5: 1st sheave 6: 2nd sheave 7: Telescopic crawler 9: Wire
10: Pile puncher
19: Pile cap
P: Existing pile

Claims (6)

A pile removing machine for extracting existing piles buried in the ground,
With a leader that can stand almost vertically from the surface of the earth,
A first sheave and a second sheave provided at one end of the leader,
A guide sheave that the first sheave supports via a wire, holds the existing pile and pulls it out,
A speed reducer for supporting the second sheave through a wire, burying the casing in the ground, and pulling it from the ground;
Equipped with
The leader has a first rail and a second rail from the one end to the other end, and the guide sheave is slidably fitted to the first rail and slidable on the second rail. A pile removing machine, characterized in that the speed reducer is fitted to. The pile shedding machine according to claim 1, wherein the guide sheave pulls the wire with a pulley. 2. The position of the guide sheave and the position of the speed reducer can be changed by rotating the leader standing upright in a substantially vertical direction with the one end portion facing upward, in a substantially horizontal direction. Alternatively, the pile removing machine described in 2. A pile-pulling method for pulling out existing piles buried in the ground,
A casing embedding step of embedding the casing held by the reducer in the ground around the existing pile,
A casing pulling process of pulling the casing out of the ground by pulling up the reducer,
A pile withdrawing step of pulling out the existing pile with the guide sheave,
The guide sheave fitted to the substantially vertical standing leader from the ground surface to the top portion slides along the leader and fits to the second rail provided from the ground surface to the top portion of the leader. The method of removing a pile, wherein the speed reducer slides along the leader. The method of claim 4, wherein the guide sheave pulls the wire with a pulley. Between the casing drawing step and the pile drawing step, the leader is rotated in a substantially horizontal direction, and a position changing step of changing the position of the guide sheave and the position of the speed reducer is executed. The pile removing method according to claim 4 or 5.

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