JP2019035268A - Pile cap of pile extraction machine, and pile extraction method using pile cap - Google Patents

Abstract

To provide a method of safely extracting an existing pile.SOLUTION: A pile cap of a pile extraction machine for extracting an existing pile P comprises: an approximately cylindrical inner cylinder portion 3; a cap body 2 provided at an outer side of the inner cylinder portion 3 movably along the inner cylinder portion 3; claws 7a,7c shaft-supported on an outer peripheral wall of the cap body 2; and an inner cylinder portion window 3W and a cap body window 2W respectively penetrating and provided in the inner cylinder portion 3 and the cap body 2 so that the claws 7a,7c can stand in an inside of an inner peripheral wall 3N of the inner cylinder portion 3. Moving the cap body 2 upward with respect to the inner cylinder portion 3 stands the claws 7a,7c in the inside of the inner peripheral wall 3N of the inner cylinder portion 3. Meanwhile, moving the cap body 2 downward with respect to the inner cylinder portion 3 lays the claws 7a,7c to the inner peripheral wall 3N side of the inner cylinder portion 3.SELECTED DRAWING: Figure 3

Description

The present invention relates to a construction method for pulling out an existing pile buried in the ground when a building structure is rebuilt.

  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 Document 1, when an 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 top of an existing pile in the ground, and when hanging a wire on a heavy existing pile that has been pulled up halfway, There was a problem that an accident could occur in which an existing pile accidentally dropped into the ground and workers were pulled into the ground.

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

In order to solve the above problems, the present invention is a pile cap of a pile removing machine for pulling out an existing pile,
A substantially cylindrical inner cylindrical portion;
A cap body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion;
Claws pivotally supported on the outer peripheral wall of the cap body;
An inner cylindrical portion window and a cap body window provided through the inner cylindrical portion and the cap body, respectively, so that the claw can stand up from the inner peripheral wall of the inner cylindrical portion;
The claw is raised from the inner peripheral wall of the inner cylindrical portion by raising the cap main body with respect to the inner cylindrical portion, and the claw is lowered by lowering the cap main body with respect to the inner cylindrical portion. The present invention provides a pile cap for a pile remover characterized in that the pile cap is laid down on the inner peripheral wall side of the inner cylindrical portion.

  By using the pile cap with this configuration, the existing pile can be safely pulled out without dangerous wire hanging.

  You may comprise the axial support direction of the said nail | claw being a direction orthogonal to the moving direction of the said cap main body with respect to the said inner side cylindrical part.

  By this structure, a nail | claw can be made to stand or fall down only by the movement of the cap main body with respect to an inner side cylindrical part, and an existing pile can be hold | gripped with a simple structure.

Moreover, in order to solve the said subject, this invention is the pile drawing-out method using the pile cap which pulls out the existing pile,
A substantially cylindrical inner cylindrical portion, a cap main body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion, a claw pivotally supported on an outer peripheral wall of the cap main body, and the claw An inner cylindrical portion window and a cap main body window provided through the inner cylindrical portion and the cap body, respectively, so as to be able to stand up from the inner peripheral wall of the inner cylindrical portion, and with respect to the inner cylindrical portion, Raising the cap body raises the claw from the inner peripheral wall of the inner cylindrical portion, and lowering the cap main body relative to the inner cylindrical portion moves the claw to the inner peripheral wall side of the inner cylindrical portion. A pile cap preparation process for preparing a pile cap of a pile puller to fall down;
A casing preparation step for preparing a casing to be embedded in the ground;
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;
By positioning the pile cap with the cap body raised relative to the inner cylindrical portion around the existing pile and lowering the claw while abutting the head of the existing pile, the claw is moved to the inner cylinder. A nail lodging process to fall on the inner peripheral wall side of the part,
A pile cap embedding step of embedding the pile cap in the ground along the existing pile;
Pile pulling step of raising the pile cap body with respect to the inner cylindrical part and holding or supporting the existing pile by raising the claw from the inner peripheral wall of the inner cylindrical part and pulling the existing pile A pile drawing method using a pile cap characterized by comprising:

  With this configuration, the existing pile can be safely pulled out without dangerous wire hanging.

  An existing pile can be safely pulled out by the pile cap of the pile puller of the present invention and the pile pulling method using the pile cap.

It is a figure which shows the pile cap 1 of the state in which the nail | claw 7 in the Example 1 of this invention fell. It is a figure which shows the pile cap 1 of the state in which the nail | claw 7 in the Example 1 of this invention stood up. It is a figure explaining the fall and standing of the nail | claw 7 in Example 1 of this invention, (a) shows the lying state, (b) shows the standing state. It is a figure explaining the casing preparation process in Example 1 of this invention. It is a figure explaining the (a) and (b) casing embedding process in Example 1 of this invention, and the (c) casing extraction process. It is a figure explaining the (a) pile cap embedding process in Example 1 of this invention, the (b) and (c) pile drawing-out process.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a pile cap 1 in a state in which a claw 7 in the first embodiment of the present invention is laid down. FIG. 2 is a diagram illustrating the pile cap 1 in a state where the claws 7 are erected in the first embodiment of the present invention. FIGS. 3A and 3B are diagrams for explaining the fall / stand of the claw 7 according to the first embodiment of the present invention, where FIG. 3A shows the fallen state and FIG. 3B shows the stand state. FIG. 4 is a diagram illustrating a casing preparation process in the first embodiment of the present invention. FIG. 5 is a diagram illustrating (a) and (b) a casing embedding process and (c) a casing drawing process in Embodiment 1 of the present invention. FIG. 6 is a diagram illustrating (a) a pile cap embedding step, (b) and (c) a pile drawing step in Example 1 of the present invention.

(Pile cap)
In order to pull out the existing pile P buried in the ground, a chucking mechanism that holds the existing pile P or supports the tip is referred to as a pile cap in the present application. The pile cap 1 in Example 1 is demonstrated. As shown in FIGS. 1 to 3, the pile cap 1 includes a substantially cylindrical inner cylindrical portion 3, a cap main body 2 provided outside the inner cylindrical portion 3 so as to be movable along the inner cylindrical portion 3, and a cap main body. The four claws 7 (7a, 7b, 7c, 7d) pivotally supported on the outer peripheral wall 2 and the claws 7 (7a, 7b, 7c, 7d) can stand up from the inner peripheral wall of the inner cylindrical portion 3, An inner cylindrical portion window 3W and a cap main body window 2W provided through the inner cylindrical portion 3 and the cap main body 2 are provided.

Then, the claw 7 (7a, 7b, 7c, 7d) is brought into contact with the upper part of the inner cylindrical window 3W by raising the cap main body 2 with respect to the inner cylindrical portion 3, and the inside of the inner peripheral wall 3N of the inner cylindrical portion 3 The claw 7 (7a, 7b, 7c, 7d) comes into contact with the lower portion of the inner cylindrical window 3W by lowering the cap body 2 with respect to the inner cylindrical portion 3, and the inner peripheral wall 3N of the inner cylindrical portion 3 I surrender to the side. FIGS. 1 and 3 (a) show the state in which the claws 7 (7a, 7b, 7c, 7d) are lying down, and FIGS. 2 and 3 (b) show that the claws 7 (7a, 7b, 7c, 7d) stand up. Indicates the state. The claw 7 (7a, 7b, 7c, 7d) is pivotally supported on the outer periphery of the cap body 2 every 90 ° in a direction perpendicular to the moving direction of the cap body 2 with respect to the inner cylindrical portion 3. The claw 7d exists on the opposite side of the claw 7b between the claw 7a and the claw 7c, but is not shown.

  The claw 7 (7a, 7b, 7c, 7d) is made of iron as a main material, can withstand the weight of the existing pile P to be pulled out, and has a size that comes into contact with the existing pile P. In Example 1, the length is 200 to 300 mm, the width is 100 mm, and the thickness is about 50 mm. A direction having a length of 200 to 300 mm is referred to as a longitudinal direction in the present application.

  The end of the claw 7 (7a, 7b, 7c, 7d) opposite to the side on which the shaft is supported may be formed with an acute tip to improve the gripping force on the existing pile P. Moreover, you may process with the material which consists of superhardness at the front-end | tip.

  In Example 1, the direction in which the claw 7 (7a, 7b, 7c, 7d) is axially supported is a direction orthogonal to the moving direction of the cap body 2 with respect to the inner cylindrical portion 3, and the claw 7 (7a, 7a, 7b, 7c, 7d) can be laid down or raised, but is not necessarily limited to this and can be changed as appropriate. For example, the same direction as the moving direction of the cap body 2 relative to the inner cylindrical portion 3 may be used. Thereby, the length of the moving direction of the pile cap 2 can be shortened.

The cap body 2 is connected to a substantially circular top plate 5 by two joints 4 (4a, 4b). One wire hook 6 is provided at the center of the top plate 5. As will be described later, the pile cap 1 can be hung by a crane or the like by hanging a wire on the wire hanging portion 6.

Here, the wire hooking portion 6 becomes the upper portion of the pile cap 1, and the portion where the claws 7 (7 a, 7 b, 7 c, 7 d) are pivotally supported becomes the lower portion of the pile cap 1. Moving the cap body 2 in the direction from the lower part to the upper part of the pile cap 1 is called raising. Conversely, moving the cap body 2 in the direction from the upper part to the lower part of the pile cap 1 is called lowering.

  In addition, in Example 1, although it comprised so that the four claws 7 (7a, 7b, 7c, 7d) and the two joints 4 (4a, 4b) might be provided, it is not necessarily limited to this and the pile cap 1 The size can be changed as appropriate depending on the size and weight. For example, the number of claws 7 may be one to three, or five or more claws 7 may be provided. Further, three or more joints 4 may be provided.

  Furthermore, although it comprised so that one wire hook part 6 might be provided in the center part of the top plate 5, it is not necessarily limited to this, It can change suitably according to the magnitude | size of the pile cap 1, or the convenience of a weight. For example, you may comprise so that the wire hooking part 6 may be provided in two or more edge parts of the top plate 5. FIG. Moreover, the top plate 5 is good also as hollow parts other than an outline.

FIG. 1 is a diagram showing a pile cap 1 in a state where claws 7 (7a, 7b, 7c, 7d) are lying down. For example, the pile cap 1 is shown when the pile cap 1 is placed on the ground. Yes. That is, the position of the cap body 2 is lowered and the overall height of the pile cap 1 is low. And the nail | claw 7 (7a, 7b, 7c, 7d) is lying down to the inner peripheral wall 3N side of the inner side cylindrical part 3. As shown in FIG. As shown in FIG. 3A, the cap body 2 descends with respect to the inner cylindrical portion 3, so that the claws 7 (7 a, 7 b, 7 c, 7 d) supported on the outer peripheral wall of the cap body 2 are used. This is because the lower end portion in the longitudinal direction of () comes into contact with the lower portion of the inner cylindrical window 3W. In addition, although the existing pile P is described by the dashed-dotted line in Fig.3 (a), this is for demonstrating the below-mentioned nail fall process, and the nail | claw 7 (7a, 7b, 7c, 7d) is shown. When the pile cap 1 is lowered while being in contact with the existing pile P, force is applied to the claws 7 (7a, 7b, 7c, 7d) and the cap body 2 is lowered with respect to the inner cylindrical portion 3. That is, the claws 7 (7a, 7b, 7c, 7d) lie down on the inner peripheral wall 3N side of the inner cylindrical portion 3.

  Moreover, FIG. 2 is a figure which shows the pile cap 1 of the state which the nail | claw 7 (7a, 7b, 7c, 7d) stood inside the inner peripheral wall 3N of the inner side cylindrical part 3, for example, piled the pile cap 1 with a wire It represents a state where it is pulled up from the ground by hanging it on the part 6 or the like. That is, the position of the cap body 2 rises and the height of the pile cap 1 as a whole is high. And the nail | claw 7 (7a, 7b, 7c, 7d) stands up from the inner peripheral wall 3N of the inner side cylindrical part 3 inside. As shown in FIG. 3 (b), the claw 7 (7 a, 7 b, 7 c, 7 d) pivotally supported on the outer peripheral wall of the cap body 2 by raising the cap body 2 relative to the inner cylindrical portion 3. This is because the upper end portion in the longitudinal direction of a) contacts the upper portion of the inner cylindrical window 3W. In addition, in FIG.3 (b), although the existing pile P is described with the dashed-dotted line, this is for demonstrating the pile drawing-out process mentioned later, and the nail | claw 7 (7a, 7b, 7c, 7d) is provided. The existing pile P can be pulled out by standing up from the inner peripheral wall 3N of the inner cylindrical portion 3 and holding or supporting the existing pile P. When the existing pile P is gripped by the claw 7 (7a, 7b, 7c, 7d), the tip of the claw 7 (7a, 7b, 7c, 7d) opposite to the shaft-supported side is formed at an acute angle. And it is good to improve the grasping force with respect to the existing pile P. In addition, it is better to process the tip portion with a material made of super hard material.

  As described above, the pile cap 1 according to the first embodiment of the present invention can grip or support the existing pile P without using a drive device such as a hydraulic cylinder. For this reason, the existing pile P can be pulled out with a simple configuration without cost. In addition, by hooking the wire hanging portion 6 in advance, work in a dangerous state becomes unnecessary, and the existing pile P can be pulled out safely.

(Pile removal method using a pile cap)
First, a pile cap preparation process is performed. The pile cap refers to a chucking mechanism that grips the existing pile P or supports the tip in order to pull out the existing pile P buried in the ground. In Example 1, the above-mentioned pile cap 1 is prepared, and the existing pile P is grasped or supported and pulled out in a pile drawing-out process described later.

  Next, a casing preparation process is executed to prepare a cylindrical casing 10 that joins a plurality of divided casings and has a drilling blade at the lowermost end. More specifically, as shown in FIG. 4, a telescopic crawler pile remover capable of moving on a caterpillar and easily assembled is prepared. In this telescopic crawler pile remover, a casing 10 in which five divided casings are joined by a crane is suspended by a hydraulic reduction gear. The hydraulic reduction gear is embedded in the ground while rotating the casing 10 and digging the ground 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.

  In the first embodiment, a telescroller pile remover that can be moved by a caterpillar and is easy to assemble is prepared. However, the present invention is not necessarily limited to this and can be changed as appropriate. For example, you may make it prepare the arbitrary pile cutting machines which cannot perform a caterpillar movement.

  An existing pile P is buried in the ground. The existing pile P is approximately 150 mmφ to 1200 mmφ in diameter and 6 m to 22 m in length, and the material is cement (PC pile), pine (pine pile), steel pipe (steel pipe pile), and the like. The casing 10 is selected according to the diameter and length of the existing pile P. That is, the casing 10 is prepared so that the inner diameter of the casing 10 is larger than the diameter of the existing pile P and the length reaches the tip P1 of the existing pile P. And the existing pile P excavates soil so that the head P2 can be seen.

  In addition, in Example 1, although the number of the division | segmentation casings in the casing 10 to prepare was 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 10 in the ground so as to be positioned around the existing pile P is executed. As shown in FIG. 5 (a), the casing 10 is positioned and lowered around the existing pile P, and as shown in FIG. 5 (b), the casing 10 is buried in the ground while rotating. And if the casing 10 is embedded until it reaches the front-end | tip P1 of the existing pile P, a casing extraction process will be performed and the casing 10 will be extracted as shown in FIG.5 (c). After the casing 10 is pulled out, the soil around the existing pile P is removed by the casing 10.

After the casing 10 is pulled out from the ground, a wire is hung on the wire hooking portion 6 of the prepared pile cap 1 and is aligned with the existing pile P and lowered. That is, the pile cap 1 in a state where the cap body 2 is raised with respect to the inner cylindrical portion 3 of the pile cap 1 is positioned around the existing pile P, and the claws 7 (7a, 7b, 7c, 7d) are attached to the existing pile P. The claw 7 (7a, 7b, 7c, 7d) is pushed by the head P2 of the existing pile P, and the cap body 2 is lowered relative to the inner cylindrical portion 3 by being lowered while being brought into contact with the head P2. Thus, the claws 7 (7a, 7b, 7c, 7d) are laid down on the inner peripheral wall 3N side of the inner cylindrical portion 3 (see FIG. 3A). That is, the nail fall process is executed by lowering the pile cap 1 while bringing the pile cap 1 into contact with the head P2 of the existing pile P.

  Next, a pile cap embedding step for embedding the pile cap 1 in a space formed in the ground along the existing pile P is executed. That is, by performing the above-described casing embedding step, soil is removed around the existing pile P to create a space, and thus the pile cap 1 is positioned and embedded in this space (see FIG. 6A). ).

Next to the pile cap embedding process, a pile drawing process is executed. That is, the pile cap body 2 is lifted with respect to the inner cylindrical portion 3 by pulling up the pile cap 1 with a wire, and the claw 7 (7a, 7b, 7c, 7d) is moved from the inner peripheral wall 3N of the inner cylindrical portion 3 to the inside. Can stand up. The existing pile P can be gripped by the claws 7 (7a, 7b, 7c, 7d) (see FIG. 3B). If the pile cap 1 is pulled up in this state, the gripped existing pile P can be pulled out (see FIGS. 6B and 6C). In this case, if the tip of the claw 7 (7a, 7b, 7c, 7d) is processed at an acute angle, the existing pile P can be gripped more reliably.

Here, since the pile cap 1 has a configuration in which the existing pile P is gripped by raising the cap body 2 with respect to the inner cylindrical portion 3, many workers are engaged like a conventional wire-hanging operation. However, there is no work around the existing pile P, and the danger that the worker is drawn into the ground can be prevented.

Finally, cement milk and sand are thrown into the underground space after being pulled out, and the underground space is backfilled to complete the extraction of the existing pile P.

  In addition, in Example 1, although it comprised so that the existing pile P might be hold | gripped and pulled out with the nail | claw 7 (7a, 7b, 7c, 7d) of the pile cap 1, it is not necessarily limited to this but can change suitably. . For example, when the existing pile P is relatively short, the tip P1 of the existing pile may be supported and pulled out by the claws 7 (7a, 7b, 7c, 7d) of the pile cap 1.

That is, in the pile cap embedding step, the pile cap 1 is embedded up to the tip P1 of the existing pile P. And the nail | claw 7 (7a, 7b, 7c, 7d) is made to stand inside from the inner peripheral wall 3N of the inner cylindrical part 3 by raising the pile cap main body 2 with respect to the inner cylindrical part 3 of the pile cap 1, and the existing pile Support the tip of P. If the pile cap 1 is pulled up in this state, the tip P1 of the existing pile P can be lifted and pulled out, and the existing pile P can be broken in the middle of pulling and pulled out to the ground without leaving a part in the ground. Can do.

  In this case, the wire hooking portion 6 in the pile cap 1 is provided not at the center of the top plate 5 but at both ends or three locations, and the existing pile P passes through the top plate 5 with the portion other than the contour portion of the top plate 5 being hollow. It is better to configure in this way.

Thus, in Example 1, it is a pile cap of a pile remover that pulls out an existing pile,
A substantially cylindrical inner cylindrical portion;
A cap body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion;
Claws pivotally supported on the outer peripheral wall of the cap body;
An inner cylindrical portion window and a cap body window provided through the inner cylindrical portion and the cap body, respectively, so that the claw can stand up from the inner peripheral wall of the inner cylindrical portion;
The claw is raised from the inner peripheral wall of the inner cylindrical portion by raising the cap main body with respect to the inner cylindrical portion, and the claw is lowered by lowering the cap main body with respect to the inner cylindrical portion. By using a pile cap of a pile puller characterized by lying on the inner peripheral wall side of the inner cylindrical portion, the existing pile can be safely pulled out without dangerous wire hanging.

Moreover, it is a pile drawing method using a pile cap that pulls out an existing pile,
A substantially cylindrical inner cylindrical portion, a cap main body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion, a claw pivotally supported on an outer peripheral wall of the cap main body, and the claw An inner cylindrical portion window and a cap main body window provided through the inner cylindrical portion and the cap body, respectively, so as to be able to stand up from the inner peripheral wall of the inner cylindrical portion, and with respect to the inner cylindrical portion, Raising the cap body raises the claw from the inner peripheral wall of the inner cylindrical portion, and lowering the cap main body relative to the inner cylindrical portion moves the claw to the inner peripheral wall side of the inner cylindrical portion. A pile cap preparation process for preparing a pile cap of a pile puller to fall down;
A casing preparation step for preparing a casing to be embedded in the ground;
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;
By positioning the pile cap with the cap body raised relative to the inner cylindrical portion around the existing pile and lowering the claw while abutting the head of the existing pile, the claw is moved to the inner cylinder. A nail lodging process to fall on the inner peripheral wall side of the part,
A pile cap embedding step of embedding the pile cap in the ground along the existing pile;
Pile pulling step of raising the pile cap body with respect to the inner cylindrical part and holding or supporting the existing pile by raising the claw from the inner peripheral wall of the inner cylindrical part and pulling the existing pile By using a pile drawing method using a pile cap characterized in that, the existing pile can be safely pulled out without dangerous wire hanging.

The pile cap of the pile puller in the present invention and the pile removal method using the pile cap can be widely used in the field of existing pile extraction.

1: Pile cap 2: Cap body 2W: Cap body window
3: Inner cylindrical part 3N: Inner peripheral wall 3W; Inner cylindrical window
4: Joint 5: Top plate 6: Wire hook 7: Claw
10: Casing
P: Existing pile P1: Tip P2: Head

Claims (3)

It is a pile cap of a pile puller that pulls out an existing pile,
A substantially cylindrical inner cylindrical portion;
A cap body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion;
Claws pivotally supported on the outer peripheral wall of the cap body;
An inner cylindrical portion window and a cap body window provided through the inner cylindrical portion and the cap body, respectively, so that the claw can stand up from the inner peripheral wall of the inner cylindrical portion;
The claw is raised from the inner peripheral wall of the inner cylindrical portion by raising the cap main body with respect to the inner cylindrical portion, and the claw is lowered by lowering the cap main body with respect to the inner cylindrical portion. A pile cap of a pile remover characterized in that the pile is laid down on the inner peripheral wall side of the inner cylindrical portion.   The pile cap of the pile removing machine according to claim 1, wherein the axial support direction of the claw is a direction orthogonal to a moving direction of the cap body with respect to the inner cylindrical portion. It is a pile drawing method using a pile cap that pulls out an existing pile,
A substantially cylindrical inner cylindrical portion, a cap main body provided outside the inner cylindrical portion so as to be movable along the inner cylindrical portion, a claw pivotally supported on an outer peripheral wall of the cap main body, and the claw An inner cylindrical portion window and a cap main body window provided through the inner cylindrical portion and the cap body, respectively, so as to be able to stand up from the inner peripheral wall of the inner cylindrical portion, and with respect to the inner cylindrical portion, Raising the cap body raises the claw from the inner peripheral wall of the inner cylindrical portion, and lowering the cap main body relative to the inner cylindrical portion moves the claw to the inner peripheral wall side of the inner cylindrical portion. A pile cap preparation process for preparing a pile cap of a pile puller to fall down;
A casing preparation step for preparing a casing to be embedded in the ground;
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;
By positioning the pile cap with the cap body raised relative to the inner cylindrical portion around the existing pile and lowering the claw while abutting the head of the existing pile, the claw is moved to the inner cylinder. A nail lodging process to fall on the inner peripheral wall side of the part,
A pile cap embedding step of embedding the pile cap in the ground along the existing pile;
Pile pulling step of raising the pile cap body with respect to the inner cylindrical part and holding or supporting the existing pile by raising the claw from the inner peripheral wall of the inner cylindrical part and pulling the existing pile A method of pulling out a pile using a pile cap.

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