JP2019015076A - Pile cutting device, pile extraction method using pile cutting device - Google Patents

Abstract

To provide a pile cutting device and a pile extraction method which extracts a heavy existing pile safely.SOLUTION: A pile cutting device 10 for cutting an existing pile P comprises: a cylindrical device body 3 provided with a first outside cylindrical portion 4 concentrically; first driving devices 8(8a,8b) making the first outside cylindrical portion 4 move along the device body 3; and cutting bits 9a,9b. The first driving devices 8(8a,8b) make the first outside cylindrical portion 4 move along the device body 3, thus the cutting bits 9a,9b are made to stand up at a sectional center side of the device body 3, or to fall down to an inner peripheral wall 3N side of the device body 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for pulling out an existing pile buried in the ground when rebuilding a building structure or the like.

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

  In Patent Literature 1, when a long existing pile is pulled out, a cylindrical casing is embedded around the existing pile, and then the casing is pulled out once and a wire ring is hung on the tip of the casing. Then, the casing is returned to the ground, and a wire ring is hung on the upper part of the existing pile to pull out only the casing. Then, after pulling up the wire hung on the existing pile halfway, cutting and removing the existing pile that came out on the ground, the method of pulling the casing again by hanging the wire ring on the upper part of the existing pile is described .

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

However, in the construction method described in Patent Document 1, it is difficult to confirm whether or not a wire ring is hung on the upper part of the existing pile in the ground, and the existing pile is accidentally dropped into the ground and the worker is in the ground. There was a problem that there was a possibility of accidents being drawn into. In particular, long and thick existing piles called cast-in-place piles (foundation piles) are heavy, so there is a high risk of accidents due to wire-hanging work.

This invention solves the said problem and makes it a subject to extract a heavy existing pile safely.

In order to solve the above problems, the present invention is a pile cutting device for cutting an existing pile,
A cylindrical apparatus body provided with a first outer cylindrical portion concentrically;
A first driving device for moving the first outer cylindrical portion along the device body;
A cutting bit, and
By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. The present invention provides a pile cutting device that is configured to do so.

  With this configuration, a long existing pile is cut in the ground with a pile cutting device and pulled out without placing a wire, so that a heavy existing pile can be pulled out safely.

A first upper arm whose one end is pivotally supported by a first upper arm fixed shaft at a lower end of an outer peripheral wall of the first outer cylindrical portion; and the apparatus main body below the first outer cylindrical portion A first lower arm whose one end is pivotally supported on the outer peripheral wall by a first lower arm fixing shaft; the other end of the first upper arm; and the other end of the first lower arm A first movable shaft that pivotally supports the portion,
The cutting bit is provided to extend the other end of the first upper arm;
The first driving device causes the first outer cylindrical portion to move toward the distal end of the apparatus body, so that the first upper arm and the first lower arm stand up toward the center of the cross section of the apparatus body, and the cutting bit. Rises, and the first driving device moves the first outer cylindrical portion in the direction opposite to the front end direction of the apparatus main body so that the first upper arm and the first lower arm are inside the apparatus main body. You may comprise so that it may fall down to the surrounding wall side and the said cutting bit may fall down.

  With this configuration, the existing pile can be reliably cut.

It has a pile gripping part that can grip the existing pile that has been cut,
The said pile holding part is good also as a structure which can select a pile holding operation or a pile holding release operation | movement with a 2nd drive device.

  With this configuration, even a thick and heavy existing pile that has been cut can be gripped and pulled out by the pile gripping portion.

The pile gripping part is
A second outer cylindrical portion provided concentrically with the cylindrical device body on the opposite side of the device body tip direction from the first outer cylindrical portion;
The second driving device for moving the second outer cylindrical portion along the device body;
A second upper arm whose one end is pivotally supported by a second upper arm fixing shaft at the lower end of the outer peripheral wall of the second outer cylindrical portion;
A second lower arm whose one end is pivotally supported by a second lower arm fixing shaft on the outer peripheral wall portion of the apparatus main body below the second outer cylindrical portion;
A second movable shaft that pivotally supports the other end of the second upper arm and the other end of the second lower arm,
The second driving device causes the second outer cylindrical portion to move toward the distal end of the apparatus main body, and the second upper arm and the second lower arm stand up toward the center of the cross-section of the apparatus main body. A gripping operation is selected, and the second driving device moves the second outer cylindrical portion in the direction opposite to the distal end direction of the apparatus main body so that the second upper arm and the second lower arm are the apparatus main body. You may comprise so that it may lie down to the inner peripheral wall side and may select the said pile holding | release operation | movement.

  With this configuration, the cut existing pile can be reliably grasped and pulled out.

Moreover, in order to solve the said subject, this invention is a pile extraction method using a pile cutting device,
A cylindrical device main body provided with a first outer cylindrical portion concentrically; a first drive device for moving the first outer cylindrical portion along the device main body; and a cutting bit, By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. A pile cutting device preparation process for preparing a pile cutting device configured as described above,
A casing preparation step of joining a plurality of divided casings and preparing a cylindrical casing having a drilling blade at the lowermost end;
A casing embedding step of embedding the casing in the ground so as to be located around an existing pile;
A casing pulling process for pulling out the casing;
Pile cutting device embedding step for embedding the pile cutting device in the ground along the periphery of the existing pile,
A pile cutting step of cutting an existing pile by the pile cutting device;
The pile extraction method using the pile cutting device provided with the pile extraction process which extracts the existing pile which cut | disconnected is provided.

  With this configuration, a long existing pile is cut in the ground with a pile cutting device and pulled out without placing a wire, so that a heavy existing pile can be pulled out safely.

  In the pile cutting step, the pile cutting device may be rotated to advance the cutting of the existing pile, and the cutting bit may be further erected while the pile cutting device is embedded in the ground.

  With this configuration, the existing pile can be reliably cut in the ground.

The pile cutting device includes a pile gripping portion capable of selecting a pile gripping operation and a pile grip releasing operation by a second driving device,
In the pile drawing process,
While selecting a gripping operation by the second driving device and gripping an existing pile,
At least in the pile cutting device embedding step,
You may comprise so that the holding | grip of the existing pile may be cancelled | released by selecting a pile holding | grip cancellation | release operation | movement with the said 2nd drive device.

  With this configuration, in the pile pulling process, even a thick and heavy existing pile that has been cut can be gripped and pulled out by the pile gripping portion.

  A heavy existing pile can be safely pulled out by the pile drawing method according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the structure of the pile cutting device in Example 1 of this invention, (a) is the figure which the cutting bit 9 laid down, (b) is the figure which the cutting bit 9 stood up. It is a figure explaining operation | movement of the pile cutting device in Example 1 of this invention, (a) is a figure when the cutting bit 9 starts the cutting | disconnection of the existing pile P, (b) is the cutting bit 9 completing a cutting | disconnection. FIG. It is a figure explaining the casing preparation process in Example 1 of this invention. It is a figure explaining the casing embedding process in Example 1 of this invention. It is a figure explaining the casing embedding process and casing extraction process in Example 1 of this invention. It is a figure explaining a pile cutting device embedding process, a pile cutting process, and a pile drawing process in Example 1 of the present invention. It is a figure explaining the pile cutting device embedding process and the pile extraction process for extracting the existing pile which remained in the ground in Example 1 of this invention. It is a figure explaining the structure of the pile cutting device in Example 2 of this invention, (a) is a side view, (b) is a bottom view. FIG. 9A is a cross-sectional view taken along the line AA ′ of FIG. 8, in which FIG. 8A is a diagram in which the cutting bit 109 is lying down, and FIG. 8A and 8B are cross-sectional views taken along the line BB ′ of FIG. 8, in which FIG. 8A is a diagram in which the second upper arm 151 and the second lower arm 152 are lying down, and FIG. FIG. It is a figure explaining the pile cutting device embedding process, pile cutting process, and pile drawing process in Example 2 of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. 1A and 1B are diagrams illustrating a configuration of a pile cutting device according to a first embodiment of the present invention. FIG. 1A is a diagram in which a cutting bit 9 is lying down, and FIG. 1B is a diagram in which a cutting bit 9 is erected. 2A and 2B are diagrams for explaining the operation of the pile cutting device according to the first embodiment of the present invention. FIG. 2A is a view when the cutting bit 9 starts cutting the existing pile P, and FIG. It is a figure at the time of completing cutting. FIG. 3 is a diagram illustrating a casing preparation process in the first embodiment of the present invention. FIG. 4 is a diagram for explaining a casing embedding process in the first embodiment of the present invention. FIG. 5 is a diagram illustrating a casing embedding process and a casing drawing process in Embodiment 1 of the present invention. FIG. 6 is a diagram illustrating a pile cutting device embedding process, a pile cutting process, and a pile drawing process in Example 1 of the present invention. FIG. 7 is a diagram for explaining a pile cutting device embedding process and a pile drawing process for drawing an existing pile remaining in the ground in Example 1 of the present invention.

(Pile cutting device)
As shown in FIG. 1, the cutting device 10 has a cylindrical device body 3, and the upper portion is configured to be connected to a casing 20 as will be described later (illustration is omitted). ). A first outer cylindrical portion 4 is provided on the outer periphery of the apparatus main body 3 so as to be movable along the apparatus main body 3 by driving of the first drive device 8. The apparatus main body 3 is provided with a window penetrating in part, and the first upper arm 1 (1a, 1b) and the first lower arm 2 (2a, 2b) are cross-sections of the apparatus main body 3 through the window. It is provided to stand on the center side (see FIG. 1B) or to fall on the inner peripheral wall 3N side of the apparatus body 3 (see FIG. 1A).

  The first lower arm 2 (2a, 2b) has a U-shape with a hollowed end, and the first upper arm 1 (1a, 1b) enters the hollowed portion. Yes. One end of the first upper arm 1 (1a, 1b) is connected to the apparatus main body 3 by the first upper arm fixed shaft 5 (5a, 5b) in the first upper arm fixed shaft mounting portion 12 (12a, 12b). It is axially supported in a direction orthogonal to the longitudinal direction. One end of the first lower arm 2 (2a, 2b) is connected to the first lower arm fixed shaft mounting portion 13 (13a, 13b) by the first lower arm fixed shaft 6 (6a, 6b). It is pivotally supported in a direction orthogonal to the longitudinal direction of the main body 3. As shown in FIG. 1, the first upper arm fixed shaft mounting portion 12 (12a, 12b) is provided at the lower end portion of the first outer cylindrical portion 4, and the first lower arm fixed shaft mounting portion is provided. The part 13 (13a, 13b) is provided on the outer peripheral wall part of the apparatus main body 3 below the first outer cylindrical part 4 (apparatus main body tip direction D). That is, the first upper arm 1 (1a, 1b) is pivotally supported on the lower end portion of the first outer cylindrical portion 4 by the first upper arm fixing shaft 5 (5a, 5b), and the first lower arm 2 is supported. (2a, 2b) are pivotally supported by the first lower arm fixing shaft 6 (6a, 6b) on the outer peripheral wall portion of the apparatus main body 3 below the first outer cylindrical portion 4. Further, at the location where the second lower arm 2 (2a, 2b) is cut out, the first upper arm 1 (1a, 1b) and the first lower arm 2 are moved by the first movable shaft 7 (7a, 7b). The other end of each of (2a, 2b) is pivotally supported.

  Cutting bits 9 (9a, 9b) are provided to extend the other end of the first upper arm 1 (1a, 1b). An ultra-hard bit made of diamond or the like is provided at the tip of the cutting bit 9 (9a, 9b), whereby the existing pile P can be cut.

  Here, the length of the first upper arm 1 (1a, 1b) is shorter than that of the first lower arm 2 (2a, 2b). Therefore, as will be described later, the first upper arm 1 (1a, 1b) can be erected in a direction substantially perpendicular to the distal direction D of the apparatus body 3, and the first upper arm 1 ( The first lower arm 2 (2a, 2b) can be erected at a position supporting 1a, 1b) (see FIG. 1 (b)).

The first upper arm 1 (1a, 1b) and the first lower arm 2 (2a, 2b) are made of iron as a main material and have dimensions corresponding to the diameter of the existing pile P to be cut. Specifically, when the cutting bit 9 (9a, 9b) is completely erected, the first upper arm 1 (1a, 1b), the first The lengths of the lower arm 2 (2a, 2b) and the cutting bit 9 (9a, 9b) are configured.

  In the first embodiment, the first driving device 8 (8a, 8b) is constituted by a hydraulic cylinder, and when the first driving device 8 (8a, 8b) compresses, the first outer cylindrical portion 4 becomes the device main body. When the first outer cylindrical portion 4 is moved in the direction opposite to the distal end direction D and extended, the first outer cylindrical portion 4 is moved in the distal end direction D of the apparatus main body. Therefore, as shown in FIG. 1A, the first outer cylindrical portion 4 is moved in the direction opposite to the distal end direction D of the apparatus main body 3 by the compression of the first driving device 8, and the first upper arm 1 (1a, 1b) falls on the inner peripheral wall 3N side. Then, when the first upper arm 1 (1a, 1b) falls on the inner peripheral wall 3N side, the first lower arm 2 (2a, 1b) is placed on the other end of the first upper arm 1 (1a, 1b). Since the other end of 2b) is pivotally supported, the first lower arm 2 (2a, 2b) also falls on the inner peripheral wall 3N side. Further, the cutting bit 9 (9a, 9b) provided to extend to the other end of the first upper arm 1 (1a, 1b) also lies down on the inner peripheral wall 3N side.

  In the first embodiment, the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) lie down on the inner peripheral wall 3N side. However, more preferably, it may be configured to fall outside the inner peripheral wall 3N. Thereby, in the casing embedding process described later, the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) due to the influence of earth pressure are provided. Since it is possible to prevent the body from falling outside more than necessary, when the first driving device 8 (8a, 8b) is extended, the first upper arm 1 (1a, 1b) and the first lower arm 2 (2a, 2b) and the cutting bit 9 (9a, 9b) can be prevented from standing up and not standing up rather than inside.

  In FIG. 1 (b), the first driving device 8 (8a, 8b) is extended, the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) shows a state in which the apparatus main body 3 stands on the cross-sectional center side. In other words, the first upper arm 1 (1a, 1b), by extending the first driving device 8 (8a, 8b) and moving the first outer cylindrical portion 4 in the distal direction D of the device body 3, The first lower arm 2 (2a, 2b) and the cutting bit 9 (9a, 9b) stand up from the inner peripheral wall 3N of the apparatus main body 3 using windows provided through the apparatus main body 3.

  In the first embodiment, the number of the first upper arm, the first lower arm, and the cutting bit is two. However, the number is not necessarily limited to this, depending on the hardness and diameter of the existing pile P to be cut. Can be changed as appropriate. For example, the number of the first upper arm, the first lower arm, and the cutting bit may be three or more. In the first embodiment, two first driving devices are provided. However, the first driving device is not necessarily limited thereto, and can be appropriately changed depending on the hardness of the existing pile P or the like. For example, three or more first driving devices may be used in accordance with the number of first upper arms, first lower arms, and cutting bits.

  Next, the operation of the pile cutting device 10 will be described. The pile cutting device 10 is mainly used when cutting an existing pile P embedded in the ground. As shown in FIG. 2 (a), the pile cutting device 10 embedded around the existing pile P first extends the first drive device 8 (8a, 8b) to cut the cutting bit 9 (9a, 9b). Is brought into contact with the existing pile P. And the pile cutting device 10 is rotated and the cutting of the existing pile P is started by the cutting bit 9 (9a, 9b).

  In accordance with the progress of the cutting of the existing pile P, in addition to the rotation of the pile cutting device 10, the first drive device 8 (8a, 8b) is further extended to the first upper arm 1 (1a, 1b), the first The lower arm 2 (2a, 2b) and the cutting bit 9 (9a, 9b) are gradually raised to the center of the cross section of the apparatus body 3. At the same time, the pile cutting device 10 is gradually embedded into the ground. As a result, finally, as shown in FIG. 2B, the cutting bit 9 (9a, 9b) stands almost horizontally with the first upper arm 1 (1a, 1b). If the cutting bit 9 (9a, 9b) and the first upper arm 1 (1a, 1b) stand substantially horizontally, the first driving device 8 (8a, 8b) extends and the pile cutting device 10 enters the ground. Stop embedding of. And if rotation is continued, raising the pile cutting device 10 a little, the existing pile P will be cut | disconnected naturally and the existing pile P of the lower side after cutting will fall below.

  In the first embodiment, the first driving device 8 (8a, 8b) is constituted by a hydraulic cylinder, but is not necessarily limited to this and can be changed as appropriate. For example, you may comprise so that other drive devices, such as a motor drive, may be used.

  In the first embodiment, the cutting bit 9 (9a, 9b) is provided so as to extend to the other end of the first upper arm 1 (1a, 1b). Is possible. For example, you may provide so that it may extend to the other edge part of the 1st lower arm 2 (2a, 2b). In this case, it is preferable to provide the first lower arm 2 (2a, 2b) so as to extend at a predetermined angle.

  If the existing pile P is cut in the ground using such a pile cutting device 10, it is not necessary to cut and wire the existing pile P on the ground. There is no danger of being pulled in, and the existing pile P can be pulled out safely.

(Pile removal method using a pile cutting device)
First, the pile cutting device preparation step is executed, and the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) are connected to the inner peripheral wall 3N. The above-described pile cutting device 10 lying on the side is prepared.

  Next, a casing preparation process is executed to prepare a cylindrical casing 20 that joins a plurality of divided casings and has a drilling blade at the lowermost end. More specifically, as shown in FIG. 3, a telescopic crawler pile cutting machine 100 that can be moved by a caterpillar and is easy to assemble is prepared. The telescroller pile remover 100 suspends a casing 20 in which five divided casings are joined by a crane 40 by a hydraulic reduction gear 30. The hydraulic speed reducer 30 moves along the leader 50, rotates the casing 20, and embeds it in the ground while digging the soil with a digging blade provided at the lowermost end. Moreover, each division | segmentation casing is each joined with the volt | bolt, and it is set as the structure which 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 about 500 mmφ to 1800 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), and the like. The casing 20 is selected according to the diameter and length of the existing pile. That is, the casing 20 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 soil so that the head may be seen.

  In addition, in Example 1, although the number of the division | segmentation casings in the casing 20 to prepare was set to five, it is not necessarily limited to this, It can change suitably by convenience, such as the length of the existing pile P. For example, it may be 4 or less, or 6 or more. Further, as will be described later, in the casing embedding step, the divided casings can be further added according to the length of the existing pile P.

  Next, a casing embedding step for embedding the casing 20 in the ground so as to be positioned around the existing pile P is executed. As shown in FIG. 4 (a), the casing 20 is positioned and lowered around the existing pile P, and as shown in FIG. 4 (b), the casing 20 is rotated by the hydraulic speed reducer 30 with the excavating blade. Dig the soil and embed it in the ground. Then, as shown in FIG. 4 (c), once the uppermost divided casing of the casing 20 is embedded to near the ground, the embedding is temporarily stopped and the uppermost divided casing is separated from the divided casing immediately below it. Then lift the top split casing.

Then, as shown in FIG. 5A, a new divided casing 20c is added. That is, the lower ends of the uppermost divided casing and the uppermost end of the casing 20b embedded in the ground are joined together by bolts in the plurality of divided casings 20c. The split casing 20c is added when the long casing 20 cannot be embedded at one time because the length of the existing pile P is long like a cast-in-place pile. That is, when the existing pile P is short, it is not necessary to add the split casing 20c. And as shown in FIG.5 (b), the casing 20 is embedded deeper than the existing pile P, rotating the casing 20 with the hydraulic reduction gear 30. FIG. Thereby, the existing pile P is released from the earth pressure, and the existing pile P can be pulled out. And a casing extraction process is performed and the casing 20 is extracted from underground (refer FIG.5 (c)).

  In the case of an existing pile P of 1500φ class or more, it may be difficult to rotate the casing 20 with the hydraulic reducer 30 and embed it in the ground. In this case, the casing 20 is rotated and embedded in the ground by using a dedicated device installed on the ground surface called a tubing device.

Next, as shown in FIG. 6A, the prepared pile cutting device 10 is joined to the lowermost end of the casing 20. And the pile cutting device 10 is embedded in the ground along the existing pile P. If the pile cutting device 10 is embedded up to the planned cutting site of the existing pile P, the embedding is stopped and the pile cutting process is executed.

In the pile cutting process, the cutting bit 9 (9a, 9b) is erected until it abuts against the existing pile P, and the casing 20 and the pile cutting device 10 are rotated. Thereby, the existing pile P is gradually cut. Then, the cutting bit 9 (9a, 9b) is further erected in accordance with the progress of cutting, and the pile cutting device 10 is embedded in the ground (see FIG. 6 (b)). Then, as shown in FIG. 2 (b), when the cutting progresses to a place where the cutting bit 9 (9a, 9b) stands almost horizontally, the cutting bit 9 (9a, 9b) stands up and the pile cutting device 10 is underground. The embedding is stopped and the pile cutting device 10 is pulled up while continuing to rotate. If it does so, the existing pile P will be cut | disconnected completely with dead weight, and the existing pile P below the cut | disconnect will fall in the ground (refer FIG.6 (c)).

Next, a pile drawing process is executed. That is, the pile cutting is performed with the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) standing on the center side of the cross section of the apparatus body 3. By pulling up the device 10, the lowermost end of the existing pile P after cutting can be supported and pulled out.

  Next, a remaining pile drawing process is performed and the existing pile P below the cut after being left in the ground is pulled out. That is, as shown to Fig.7 (a), the casing 20c is added and the long casing 20 is comprised, and the pile cutting device 10 is embedded to the lowest end of the existing pile P left in the ground (FIG.7 (b)). reference). Then, the first upper arm 1 (1a, 1b), the first lower arm 2 (2a, 2b), and the cutting bit 9 (9a, 9b) of the pile cutting device 10 are erected on the center side of the cross section of the device body 3. Then, the lower end of the existing pile P is supported or the lowermost part is held by the cutting bit 9 (9a, 9b), and the casing 20 and the pile cutting device 10 are pulled out. Thereby, the existing pile P below the cut after being left in the ground can be pulled out to the ground (see FIG. 7C).

  Conventionally, when pulling out a long and heavy existing pile P, the wire was hooked on the head of the existing pile P and pulled out. However, in the above-described pile pulling method using the pile cutting device 10, a wire hook is used. No longer needed. As a result, it is possible to eliminate an accident in which an operator is drawn into the ground during wire hanging, and it is possible to safely pull out a heavy existing pile.

Thus, in Example 1 of the present invention, a pile cutting device for cutting an existing pile,
A cylindrical apparatus body provided with a first outer cylindrical portion concentrically;
A first driving device for moving the first outer cylindrical portion along the device body;
A cutting bit, and
By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. By using a pile cutting device characterized in that it is configured to cut a long existing pile in the ground with a pile cutting device and pull it out without hanging a wire, so that a heavy existing pile can be pulled out safely Can do.

In addition, a pile removal method using a pile cutting device,
A cylindrical device main body provided with a first outer cylindrical portion concentrically; a first drive device for moving the first outer cylindrical portion along the device main body; and a cutting bit, By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. A pile cutting device preparation process for preparing a pile cutting device configured as described above,
A casing preparation step of joining a plurality of divided casings and preparing a cylindrical casing having a drilling blade at the lowermost end;
A casing embedding step of embedding the casing in the ground so as to be located around an existing pile;
A casing pulling process for pulling out the casing;
Pile cutting device embedding step for embedding the pile cutting device in the ground along the periphery of the existing pile,
A pile cutting step of cutting an existing pile by the pile cutting device;
Pile pulling process using a pile cutting device equipped with a pile cutting process that pulls the existing pile that has been cut, and the pile cutting device cuts long existing piles in the ground and pulls them without laying wires. Existing piles can be pulled out safely.

  The second embodiment is different from the first embodiment in that the pile cutting device includes a pile gripping portion in addition to the cutting bit. A second embodiment will be described with reference to FIGS. 8A and 8B are diagrams illustrating the configuration of a pile cutting device according to the second embodiment of the present invention, in which FIG. 8A is a side view and FIG. 8B is a bottom view. 9A and 9B are cross-sectional views taken along the line AA ′ of FIG. 8, in which FIG. 9A is a diagram in which the cutting bit 109 is lying down, and FIG. 10A and 10B are cross-sectional views taken along the line BB ′ of FIG. 8, in which FIG. 10A shows the second upper arm 151 and the second lower arm 152 lying down, and FIG. 10B shows the second upper arm 151 and the second upper arm 151. It is the figure where the lower arm 152 stood up. FIG. 11 is a diagram illustrating a pile cutting device embedding process, a pile cutting process, and a pile drawing process in Example 2 of the present invention.

(Pile cutting device)
The pile cutting device 110 according to the second embodiment is mainly used when a particularly thick existing pile P having a diameter of 1500φ or more is pulled out. As shown in FIG. 8, the pile cutting device 110 includes three pile holding portions 150 in addition to the cutting bits 109 (109a, 109b, 109c).

  The pile cutting bit 109 (109a, 109b, 109c) has the same configuration as that of the first embodiment, but is different in that it includes three cutting bits. That is, three cutting bits 109 (109a, 109b, 109c) are provided every 120 ° along the circumference of the apparatus main body 103. In addition, three pile gripping portions 150 are provided every 120 ° along the circumference of the apparatus main body 103 at intermediate positions of the cutting bits 109 (109a, 109b, 109c).

  First, the configuration of the cut bit 109 (109a, 109b, 109c) will be described. A first outer cylindrical portion 104 is provided on the outer periphery of the apparatus main body 103 so as to be movable along the apparatus main body 103 when driven by the first driving device 108. The apparatus main body 103 is provided with a window penetrating in part, and the first upper arm 101 (101a, 101b, 101c) and the first lower arm 102 (102a, 102b, 102c) are connected through the window. The main body 103 is provided so as to stand on the cross-sectional center side (see FIG. 9B) or to fall on the inner peripheral wall 103N side of the apparatus main body 103 (see FIG. 9A).

The first upper arm 101 (101a, 101b, 101c) has a U shape with a part cut out in a side view, and the first lower arm 102 (102a, 102b, 102c) is formed in the cut out part. ) Enters. One end of the first upper arm 101 (101a, 101b, 101c) is connected to the first upper arm fixed shaft 105 (105a, 105b, 105c) at the first upper arm fixed shaft mounting portion 112 (112a, 112b, 112c). 105c) is axially supported in a direction orthogonal to the longitudinal direction of the apparatus main body 103. One end of the first lower arm 102 (102a, 102b, 102c) is connected to the first lower arm fixed shaft 106 (106a, 106a) at the first lower arm fixed shaft mounting portion 113 (113a, 113b, 113c). 106b and 106c) are axially supported in a direction perpendicular to the longitudinal direction of the apparatus main body 103. As shown in FIG. 9, the first upper arm fixed shaft mounting portion 112 (112a, 112b, 112c) is provided at the lower end portion of the first outer cylindrical portion 104, and is fixed to the first lower arm fixed portion. The shaft attachment portion 113 (113a, 113b, 113c) is provided on the outer peripheral wall portion of the device main body 103 below the first outer cylindrical portion 104 (device main body tip direction D). That is, the first upper arm 101 (101a, 101b, 101c) is pivotally supported by the first upper arm fixing shaft 105 (105a, 105b, 105c) on the lower end portion of the first outer cylindrical portion 104, The lower arm 102 (102a, 102b, 102c) is pivotally supported by the first lower arm fixing shaft 106 (106a, 106b, 106c) on the outer peripheral wall portion of the apparatus main body 103 below the first outer cylindrical portion 104. ing. Further, at the location where the first upper arm 101 (101a, 101b, 101c) is cut out, the first upper arm 101 (101a, 101b, 101c) and the first movable shaft 107 (107a, 107b, 107c) are connected to each other. The other end of each of the first lower arms 102 (102a, 102b, 102c) is pivotally supported.

  A cutting bit 109 (109a, 109b, 109c) is provided so as to extend the other end of the first upper arm 101 (101a, 101b, 101c). An ultra-hard bit made of diamond or the like is provided at the tip of the cutting bit 109 (109a, 109b, 109c), whereby the existing pile P can be cut.

The first upper arm 101 (101a, 101b, 101c) and the first lower arm 102 (102a, 102b, 102c) are composed mainly of iron and have dimensions corresponding to the diameter of the existing pile P to be cut. ing. Specifically, when the cutting bit 109 (109a, 109b, 109c) is completely erected, the first upper arm 101 (101a, 101b, 101c) is able to enter the inside of more than half the diameter of the existing pile P. The length of the first lower arm 102 (102a, 102b, 102c) and the cutting bit 109 (109a, 109b, 109c) is configured.

  In the second embodiment, the first driving device 108 (108a, 108b, 108c) is constituted by a hydraulic cylinder, and the first outer cylindrical portion is compressed when the first driving device 108 (108a, 108b, 108c) is compressed. 104 is moved in the direction opposite to the apparatus main body front end direction D, and when extended, the first outer cylindrical portion 104 is moved in the apparatus main body front end direction D. Therefore, the compression of the first driving device 108 moves the first outer cylindrical portion 104 in the direction opposite to the tip direction D of the device main body 103 as shown in FIG. 101 (101a, 101b, 101c) falls to the inner peripheral wall 103N side. Then, when the first upper arm 101 (101a, 101b, 101c) falls on the inner peripheral wall 103N side, the first lower arm is placed on the other end of the first upper arm 101 (101a, 101b, 101c). Since the other end of 102 (102a, 102b, 102c) is pivotally supported, the first lower arm 102 (102a, 102b, 102c) also falls on the inner peripheral wall 103N side. Further, the cutting bit 109 (109a, 109b, 109c) provided to extend to the other end of the first upper arm 101 (101a, 101b, 101c) also lies down on the inner peripheral wall 103N side.

  In FIG. 9B, the first driving device 108 (108a, 108b, 108c) is extended, and the first upper arm 101 (101a, 101b, 101c) and the first lower arm 102 (102a, 102b, 102c). ) And the cutting bit 109 (109a, 109b, 109c) stand up on the center side of the cross section of the apparatus main body 103. That is, the first driving device 108 (108a, 108b) is extended to move the first outer cylindrical portion 104 in the distal direction D of the device main body 103, whereby the first upper arm 101 (101a, 101b, 101c). ), The first lower arm 102 (102a, 102b, 102c), and the cutting bit 109 (109a, 109b) are located on the inner side of the inner peripheral wall 103N of the apparatus main body 103 using a window penetrating the apparatus main body 103. Stand up.

  In the second embodiment, the number of the first upper arm, the first lower arm, and the cutting bit is set to three. However, the number is not necessarily limited to this, depending on the hardness and diameter of the existing pile P to be cut. Can be changed as appropriate. For example, the number of the first upper arm, the first lower arm, and the cutting bit may be four or more, or two. In the first embodiment, three first driving devices are provided. However, the first driving device is not necessarily limited thereto, and can be appropriately changed depending on the hardness of the existing pile P or the like. For example, two or four or more first driving devices may be used in accordance with the number of first upper arms, first lower arms, and cutting bits.

  The pile gripping portion 150 is provided via a second outer cylindrical portion 154 provided concentrically with the cylindrical device main body 103 and on the opposite side of the device main body distal direction D from the first outer cylindrical portion 104. 2 upper arms 151 (151a, 151b, 151c) and second lower arms 152 (152a, 152b, 152c). The second outer cylindrical portion 154 can be moved along the apparatus main body 103 by the second driving device 158 (158a, 158b, 158c).

One end of the second upper arm 151 (151a, 151b, 151c) at the second upper arm fixed shaft mounting portion 162 (162a, 162b, 162c) at the lower end of the outer peripheral wall of the second outer cylindrical portion 154 The portion is pivotally supported by a second upper arm fixed shaft 155 (155a, 155b, 155c) in a direction perpendicular to the front end direction D of the apparatus main body. Further, the second lower arm fixed shaft mounting portion 163 (163a, 163b, 163c) on the outer peripheral wall portion of the apparatus main body below the second outer cylindrical portion 154 is used for the second lower arm 152 (152a, 152b, 152c). ) Is pivotally supported by a second lower arm fixing shaft 156 (156a, 156b, 156c) in a direction orthogonal to the front end direction D of the apparatus main body.

Further, the other end of the second upper arm 151 (151a, 151b, 151c) and the other end of the second lower arm 152 (152a, 152b, 152c) are connected to a second movable shaft 157 (157a). 157b, 157c), and is supported in a direction perpendicular to the front end direction D of the apparatus main body.

Then, when the second driving device 158 (158a, 158b, 158c) is extended, the second outer cylindrical portion 154 moves in the device body front end direction D and the second upper arm 151 (151a, 151b, 151c). ) And the second lower arm 152 (152a, 152b, 152c) can stand up on the cross-sectional center side of the apparatus main body 103 and select the pile gripping operation. Further, as the second driving device 158 (158a, 158b, 158c) compresses, the second outer cylindrical portion 154 moves in the direction opposite to the device body front end direction D, and the second upper arm 151 (151a, 151a, 151b, 151c) and the second lower arm 152 (152a, 152b, 152c) can fall down to the inner peripheral wall 103N side of the apparatus main body 103 and select the pile grip releasing operation.

  When the pile gripping part 150 selects the pile gripping operation, the existing pile P can be firmly gripped, and the existing pile P after cutting can be reliably pulled out in the pile pulling-out process described later. Moreover, when the pile holding | grip part 150 selects pile holding | release operation | movement, in the below-mentioned pile cutting device embedding process, the influence of earth pressure can be eliminated and a pile cutting device can be embedded in the ground.

  Note that the pile grip releasing operation may be selected in addition to the pile cutting device embedding step. For example, it is good also as selecting in a cutting bit standing-up process or a pile cutting process. At least in the pile cutting device embedding step, the pile grip releasing operation may be selected.

  Further, in order to ensure the grip of the existing pile P, the second upper arm 151 (151a, 151b, 151c) or the second lower arm 152 (152a, 152b, 152c) is sharpened at the other end. Nails may be provided.

(Pile removal method using a pile cutting device)
The pile drawing method using the pile cutting device in the second embodiment is the same as that in the first embodiment until the pile cutting device preparation step, the casing preparation step, the casing embedding step, and the casing drawing step. However, what is prepared in the pile cutting device preparation step is the above-described pile cutting device 110. And the pile cutting device embedding process, the pile cutting process, and the pile drawing process are different from the first embodiment.

  The pile cutting device embedding process in Example 2 will be described. As shown in FIG. 11A, the prepared pile cutting device 110 is joined to the lowermost end of the casing 20. And the pile cutting device 110 is embedded in the ground along the existing pile P. At this time, the three pile holding portions 150 select the pile holding release operation, and the cutting bits 109 (109a, 109b, 109c) are laid down on the inner peripheral wall 103N side of the apparatus main body 103. If the pile cutting device 110 is embedded up to the location where the existing pile P is cut, the embedding is stopped and the pile cutting step is executed.

In the pile cutting process, the three pile holding portions 150 select the pile holding release operation. And the cutting bit 109 (109a, 109b, 109c) is made to stand until it contacts the existing pile P, and the casing 20 and the pile cutting device 110 are rotated. Thereby, the existing pile P is gradually cut. Along with this, the cutting bit 109 (109a, 109b, 109c) is further erected in accordance with the progress of cutting, and the pile cutting device 110 is further embedded in the ground (see FIG. 11B). Then, as shown in FIG. 9 (b), when the cutting proceeds until the cutting bit 109 (109a, 109b, 109c) rises substantially horizontally, the cutting bit 109 (109a, 109b, 109c) rises and the pile cutting device The embedding is stopped in the ground of 110, and the pile cutting device 110 is pulled up while continuing to rotate. If it does so, the existing pile P of the lower part after cutting will fall below with dead weight, and cutting will be completed (refer to Drawing 11 (c)).

Next, a pile drawing process is executed. That is, the first upper arm 101 (101a, 101b, 101c), the first lower arm 102 (102a, 102b, 102c), and the cutting bit 109 (109a, 109b, 109c) are arranged on the center side of the cross section of the apparatus main body 103. While standing, the three pile gripping portions 150 select a pile gripping operation. That is, the second driving device 158 (158a, 158b, 158c) is extended, the second outer cylindrical portion 154 is moved in the direction D of the device body, and the second upper arm 151 (151a, 151b, 151c). And the 2nd lower arm 152 (152a, 152b, 152c) stands on the cross-sectional center side of the apparatus main body 103, and selects a pile holding | grip operation | movement. As a result, the existing pile P is supported at the lowermost end by the cutting bit 109 (109a, 109b, 109c) and the second upper arm 151 (151a, 151b, 151c) and the second lower arm in the pile gripping portion 150. The arm 152 (152a, 152b, 152c) holds the upper part of the existing pile P slightly firmly from the lowermost end. And the existing pile P of the upper direction after a cutting | disconnection can be pulled out by pulling up the pile cutting device 110. FIG.

  The existing pile P remaining in the ground is pulled out using the pile cutting device 110 in the same manner as in Example 1 to perform the remaining pile drawing process.

  Thus, in Example 2, it is provided with the pile holding part which can hold the cut existing pile, The pile holding part can choose pile holding operation or pile holding release operation with the 2nd drive device. It is possible to hold and pull out a thick and heavy existing pile that has been cut by a pile gripping part, and to cut a long existing pile in the ground with a pile cutting device and pull it without applying a wire. Existing piles can be pulled out safely.

Further, the pile cutting device includes a pile gripping portion that can select a pile gripping operation and a pile grip releasing operation by the second driving device,
In the pile drawing process,
While selecting a gripping operation by the second driving device and gripping an existing pile,
At least in the pile cutting device embedding step,
By selecting the pile grip release operation by the second driving device and releasing the grip of the existing pile, even a thick and heavy existing pile that has been cut can be gripped and pulled out by the pile grip portion, Since a long existing pile is cut in the ground and pulled without laying a wire, a heavy existing pile can be safely pulled out.

The pile cutting device according to the present invention and the pile drawing method using the pile cutting device can be widely used in the field of existing pile drawing.

1 (1a, 1b): first upper arm 2 (2a, 2b): first lower arm
3: Device main body 3N: Inner peripheral wall 4: First outer cylindrical portion
5 (5a, 5b): first upper arm fixed shaft
6 (6a, 6b): first lower arm fixing shaft
7 (7a, 7b): first movable shaft
8 (8a, 8b): First driving device 9 (9a, 9b): Disconnect bit
10: Pile cutting device
12 (12a, 12b): first upper arm fixed shaft mounting portion
13 (13a, 13b): first lower arm fixed shaft mounting portion
20: Casing 30: Hydraulic reducer 40: Crane
50: Leader 100: Telescopic crawler pile remover
101 (101a, 101b, 101c): first upper arm
102 (102a, 102b, 102c): first lower arm
103: apparatus main body 103N: inner peripheral wall 104: first outer cylindrical portion
105 (105a, 105b, 105c): first upper arm fixed shaft
106 (106a, 106b, 106c): First lower arm fixing shaft
107 (107a, 107b, 107c): first movable shaft
108 (108a, 108b, 108c): first driving device
109 (109a, 109b, 109c): Disconnect bit
110: Pile cutting device
112 (112a, 112b, 112c): First upper arm fixed shaft mounting portion
113 (113a, 113b, 113c): First lower arm fixed shaft mounting portion
151 (151a, 151b, 151c): second upper arm
152 (152a, 152b, 152c): second lower arm
154: Second outer cylindrical portion
155 (155a, 155b, 155c): second upper arm fixed shaft
156 (156a, 156b, 156c): second lower arm fixing shaft
157 (157a, 157b, 157c): second movable shaft
158 (158a, 158b, 158c): second driving device
162 (162a, 162b, 162c): second upper arm fixed shaft mounting portion
163 (163a, 163b, 163c): second lower arm fixed shaft mounting portion
D: Device body tip direction P: Existing pile

Claims (7)

A pile cutting device for cutting an existing pile,
A cylindrical apparatus body provided with a first outer cylindrical portion concentrically;
A first driving device for moving the first outer cylindrical portion along the device body;
A cutting bit, and
By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. The pile cutting device characterized by comprising so that it may do. A first upper arm whose one end is pivotally supported by a first upper arm fixing shaft at the lower end of the outer peripheral wall of the first outer cylindrical portion;
A first lower arm whose one end is pivotally supported by a first lower arm fixing shaft on the outer peripheral wall portion of the apparatus body below the first outer cylindrical portion;
A first movable shaft that pivotally supports the other end of the first upper arm and the other end of the first lower arm;
The cutting bit is provided to extend the other end of the first upper arm;
The first driving device causes the first outer cylindrical portion to move toward the distal end of the apparatus body, so that the first upper arm and the first lower arm stand up toward the center of the cross section of the apparatus body, and the cutting bit. Rises, and the first driving device moves the first outer cylindrical portion in the direction opposite to the front end direction of the apparatus main body so that the first upper arm and the first lower arm are inside the apparatus main body. The pile cutting device according to claim 1, wherein the pile bit falls on the peripheral wall side and falls. It has a pile gripping part that can grip the existing pile that has been cut,
The pile cutting device according to claim 1 or 2, wherein the pile gripping portion can select a pile gripping operation or a pile grip releasing operation by a second driving device. The pile gripping part is
A second outer cylindrical portion provided concentrically with the cylindrical device body on the opposite side of the device body tip direction from the first outer cylindrical portion;
The second driving device for moving the second outer cylindrical portion along the device body;
A second upper arm whose one end is pivotally supported by a second upper arm fixing shaft at the lower end of the outer peripheral wall of the second outer cylindrical portion;
A second lower arm whose one end is pivotally supported by a second lower arm fixing shaft on the outer peripheral wall portion of the apparatus main body below the second outer cylindrical portion;
A second movable shaft that pivotally supports the other end of the second upper arm and the other end of the second lower arm,
The second driving device causes the second outer cylindrical portion to move toward the distal end of the apparatus main body, and the second upper arm and the second lower arm stand up toward the center of the cross-section of the apparatus main body. A gripping operation is selected, and the second driving device moves the second outer cylindrical portion in the direction opposite to the distal end direction of the apparatus main body so that the second upper arm and the second lower arm are the apparatus main body. The pile cutting device according to claim 3, wherein the pile gripping release operation is selected by falling to the inner peripheral wall side of the pile. A pile removal method using a pile cutting device,
A cylindrical device main body provided with a first outer cylindrical portion concentrically; a first drive device for moving the first outer cylindrical portion along the device main body; and a cutting bit, By moving the first outer cylindrical portion along the device main body by the first driving device, the cutting bit stands on the cross-sectional center side of the device main body or falls on the inner peripheral wall side of the device main body. A pile cutting device preparation process for preparing a pile cutting device configured as described above,
A casing preparation step of joining a plurality of divided casings and preparing a cylindrical casing having a drilling blade at the lowermost end;
A casing embedding step of embedding the casing in the ground so as to be located around an existing pile;
A casing pulling process for pulling out the casing;
Pile cutting device embedding step for embedding the pile cutting device in the ground along the periphery of the existing pile,
A pile cutting step of cutting an existing pile by the pile cutting device;
A pile drawing method using a pile cutting device comprising: a pile drawing process for drawing a cut existing pile.   The said pile cutting process WHEREIN: While rotating the said pile cutting device and advancing the cutting | disconnection of an existing pile, the said cutting bit is further raised while embedding the said pile cutting device in the ground. Pile removal method using a pile cutting device. The pile cutting device includes a pile gripping portion capable of selecting a pile gripping operation and a pile grip releasing operation by a second driving device,
In the pile drawing process,
While selecting a gripping operation by the second driving device and gripping an existing pile,
At least in the pile cutting device embedding step,
The pile removal method using the pile cutting device according to claim 5 or 6, wherein the pile driving release operation is selected by the second driving device to release the existing pile.

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