JP6753656B2 - Pile extraction machine - Google Patents

Description

The present invention relates to a pile press-fitting machine and a pile press-fitting method for press-fitting piles into the ground, and a pile extraction machine.

Conventionally, a clamp device that grips the upper end of an existing pile that has been press-fitted into the ground, and a chuck that has an opening for inserting the pile up and down and presses the side surface of the pile inserted through the opening from the outside to grip the pile. A pile press-fitting / pulling machine equipped with an apparatus and an elevating drive device for elevating and driving a chuck device with respect to a clamping device is used. This pile press-fit / pull-out machine grips an existing pile adjacent to the press-fit position of the pile gripped by the chuck device in one direction by the clamp device, and then lowers the pile by the lifting drive device of the chuck device that grips the pile. By repeating the ascending operation by the elevating drive device of the chuck device that released the pile, the pile can be press-fitted into the ground, and the ascending operation by the elevating drive device of the chuck device that grips the pile and the chuck device that released the pile. The pile can be pulled out from the ground by repeating the lowering operation by the elevating drive device (for example, Non-Patent Document 1).
In the conventional pile press-fitting machine, when an existing pile adjacent to the other direction (for example, 180 degrees opposite direction) different from the one direction is gripped by the clamp device and the pile gripped by the chuck device is press-fitted into the ground. It was not configured to get a reaction force.

In the pile press-fitting machine described in Patent Document 1, the auger is driven in front of the pile chuck in a situation where there is no existing pile (no reaction force is taken from the existing pile) at the first stage of using the reaction force mount. However, when the pile is press-fitted, the reaction force mount and the existing auger are arranged in one direction with respect to the pile chuck due to the movement of the pile press-fitting machine and the reaction force mount.
In the pile press-fitting machine described in Patent Document 2, the auger (Horishin rod) is also used in the initial stage of using the reaction force pedestal, and there is no existing pile (no reaction force is taken from the existing pile). Is buried in the ground, the reaction force pedestal moved to the side of the buried auger (Horishin rod) and the auger (Horishin rod) are connected, and the auger is used as the anchor of the reaction force pedestal, and then the pile press-fitting is performed. Do.
In the pile press-fitting machine described in Patent Document 3, the pile loading test is not a pile press-fitting method, but the loading test chuck (reference numeral 53 in the same document) of the pile press-fitting machine is press-fitted. The upper end of the pile (reference numeral PO in the same document) is supported by a flange (reference numeral 54 in the same document), and the side surface of the pile required for press-fitting or pulling out of the pile is pressed from the outside and gripped to a vertical position. There is no chuck device that can be changed and grabbed.

Japanese Unexamined Patent Publication No. 8-144277 Special Fair 5-30934 Japanese Unexamined Patent Publication No. 2003-27518

Gyro press method (http://www.giken.com/files/ja/press-in/Press-in_Gyropress_JPA_ver036ja04.pdf)

In the conventional pile press-fitting machine, when the pile is press-fitted, the existing pile adjacent to the press-fitting position of the pile gripped by the chuck device is gripped by the clamp device to obtain a reaction force, but the reaction force is obtained in the other direction (especially). It does not take a reaction force by gripping a structure fixed to the ground such as an existing pile adjacent to the opposite side). Therefore, a moment is usually generated by the pressure input and the reaction force. In order to withstand the moment, the existing piles adjacent to the press-fitting position of the piles in one direction and the existing piles adjacent to the existing piles (a total of about 3 existing piles) are gripped.
However, if the press-fitting resistance is large and the above moment is large, it is undeniable that the pile press-fitting machine tilts backward, and it becomes difficult to press-fit the pile due to the inclination angle, or it is difficult to construct the pile accurately. There is a problem of becoming. Since the inclination angle does not exceed the limit, there is a problem that the pressure input must be kept small.
Further, in the conventional pile press-fitting / pulling machine, when the pile is pulled out, the existing pile adjacent to the existing pile to be pulled out which is gripped by the chuck device is gripped by the clamp device to obtain a reaction force. No reaction force is applied to the surface of the ground adjacent to the direction (particularly on the opposite side). Therefore, a moment is generated by the pulling force and the reaction force, and the pulling resistance is large. If the moment is large, it is undeniable that the pile press-fitting machine tilts forward, and it is difficult to pull out the pile due to the tilt angle. There is a problem of becoming. Since the inclination angle does not exceed the limit, there is a problem that the pulling force must be kept small.

The present invention was made in view of the problems in the above prior art, when pulling out the already設杭obtains reaction force from the existing pile, while reducing the moment may occur between the arguments抜力reaction force The challenge is to easily secure a large reaction force and pull out the pile with high efficiency.

Or of the first aspect for solving the problem, a clamping device for gripping the upper end of the existing pile press-fitted into the ground,
A grounding member that comes into contact with the surface of the ground,
A chuck device having an opening for inserting the pile up and down and pressing the side surface of the pile inserted through the opening from the outside to grip the pile.
A lifting drive device for raising and lowering the chuck device with respect to the clamp device and the grounding member is provided.
As the elevating drive device, a first elevating drive device for elevating and lowering the chuck device with respect to the clamp device and a second elevating drive device for elevating and lowering the chuck device with respect to the grounding member are separately provided. Have and
The first elevating drive device is provided by connecting the clamp device and the chuck device without going through the second elevating drive device.
The second elevating drive device is provided by connecting the grounding member and the chuck device without going through the first elevating drive device.
The existing pile to be pulled out is gripped by the clamping device in one direction with respect to the existing pile to be pulled out, and the grounding member is brought into contact with the surface of the ground adjacent to the existing pile to be pulled out in another direction different from the one direction. The ascending operation of the chuck device holding the pile by the first and second elevating drive devices and the lowering operation of the chuck device that released the existing pile to be pulled out by the first and second elevating drive devices. It is a pile pulling machine configured so that the pile can be pulled out from the ground by repetition.

According to the pile extraction machine of the present invention, the reaction force is taken from the positions adjacent to each other in different directions with respect to the existing pile to be extracted, so that a large reaction force can be generated while reducing the moment that can be generated by the extraction force and the reaction force. It can be easily secured and the pile can be pulled out with high efficiency.

It is a right side view of the pile press-fitting-out machine which concerns on one Embodiment of this invention. It is a top view of the pile press-fitting-out machine which concerns on one Embodiment of this invention. It is a front view of the pile press-fitting-out machine which concerns on one Embodiment of this invention. It is a right side view of the chuck front unit which shows the state of the back-and-forth movement of the 2nd clamp device of the pile press-fitting-out machine which concerns on one Embodiment of this invention. It is a front view of the chuck front unit which shows the state of the left-right movement of the 2nd clamp device of the pile press-fitting-out machine which concerns on one Embodiment of this invention. It is a right side view of the pulling-out form when there is no existing pile in front of the chuck of the pile press-fitting-drawing machine which concerns on one Embodiment of this invention.

An embodiment of the present invention will be described below with reference to the drawings. The following is an embodiment of the present invention and does not limit the present invention.

First, the embodiments shown in FIGS. 1 to 5 will be described.
The pile press-fit / pull-out machine 1 of the present embodiment is configured by using a conventional pile press-fit / pull-out machine 2 and attaching a chuck front unit 3 to the conventional pile press-fit / pull-out machine 2. Therefore, the directions such as front and rear in the explanation will be described with reference to the pile press-fit / pull-out machine 2.
The pile press-fitting / pulling machine 2 has three first clamp devices 21a, 21b, 21c provided at the lower part of the mast 20, a slide base 22 provided so as to be movable back and forth on the mast 20, and a slide, as in the conventional case. It includes a mast 23 erected on the base 22 so as to be rotatable, an elevating cylinder device 24, and a chuck device 25 supported by the mast 23 via the elevating cylinder device 24.
The chuck front unit 3 is supported on the frame 31 via a frame 31 attached to the front end of the chuck device 25, an elevating cylinder device 32, a biaxial horizontally movable joint 33, an elevating cylinder device 32, and a biaxial horizontally movable joint 33. The second clamp device 34 is provided. The jet reels 26 and 35 are optional because they adopt an auxiliary construction method by fluid injection. In the present embodiment, the jet reel 26 is fixed on the mast 23, and the jet reel 35 is fixed on the frame 31.

The elevating cylinder devices 24 and 32 arranged on both sides of the chuck device 25 constitute an elevating drive device that elevates and drives the chuck device 25 with respect to the first clamp devices 21a, 21b, 21c and the second clamp device 34.
The elevating cylinder device 32 is configured to expand and contract in synchronization with the branch oil passages 32a and 32b branched from the drive oil passage of the elevating cylinder device 24. Notwithstanding this, the elevating cylinder devices 24 and 32 may be configured to operate and output in a controllable manner independently of each other.

Each of the clamping devices 21a, 21b, 21c, and 34 is a mechanism for gripping the upper end portion of the existing pile press-fitted into the ground. In this embodiment, a configuration in which the tubular pile 4 is press-fitted / pulled out will be described as a basic description.
Each of the clamping devices 21a, 21b, 21c, and 34 has a plurality of pressing members that are inserted into the tubular pile 4 and advance and retreat toward the inner peripheral surface of the tubular pile to press the inner peripheral surface in a radial manner. The upper end of the tubular pile is gripped from the inside by expanding the pressing members apart from each other in the radial direction by the device. When the pile to be press-fitted / pulled out is not tubular but plate-shaped, a mechanism is applied in which two pressing members are arranged facing each other and sandwiched from the outside.
The first clamp devices 21a, 21b, and 21c can move left and right independently of the saddle 20. In addition, two of the first clamp devices 21a, 21b, and 21c are movable back and forth so as to change the arrangement pitch in the front and back.
The second clamp device 34 is movable back and forth with respect to the frame 31 as shown in FIG. 4, and is movable left and right with respect to the frame 31 as shown in FIG. This is due to the biaxial horizontal movable joint 33. The biaxial horizontal movable joint 33 is configured by vertically connecting a slider in the front-rear direction and a slider in the left-right direction.
The biaxial horizontal movable joint 33 is connected to the frame 31 via the elevating cylinder device 32. Therefore, since the elevating cylinder device 32 does not move back and forth and left and right, the movable portion can be reduced and the movable space to be secured can be reduced. It is also possible to connect the elevating cylinder device 32 to the frame 31 via a biaxial horizontal movable joint 33.

The chuck device 25 has an opening into which the tubular pile 4 is inserted, and a plurality of pressing members that advance and retreat toward the outer peripheral surface of the tubular pile 4 inserted into the opening and press the outer peripheral surface are radially arranged. Then, the tubular pile 4 is gripped from the outside by contracting each pressing member so as to approach each other in the radial direction by the cylinder device. Further, the chuck device 25 has a function of rotating the gripped tubular pile 4, and the pile press-fit / pull-out machine 1 and the pile press-fit / pull-out machine 2 can carry out the rotary press-fitting method and the rotary drawing method. When the pile to be press-fitted / pulled out is not tubular but plate-shaped, a mechanism is applied in which two pressing members are arranged facing each other and sandwiched from the outside. In any case, it is a mechanism that has an opening through which the pile is inserted vertically and presses the side surface of the pile inserted through the opening from the outside to grip the pile.

As shown in FIG. 1, the number of the first clamps is three in the present embodiment, but the number is not limited to this. The first clamp device is a first clamp device 21a, a first clamp device 21b, and a first clamp device 21c from the front. At least the first first clamp device 21a at the head is provided.
The number of the second clamp device 34 is one in the present embodiment, but the number is not limited to this.
In FIG. 1, among the piles 4a, 4b, 4c, 4d, 4e arranged in a row, the second clamp device 34 skips one pile 4a, the first clamp device 21a skips the pile 4c, and the first clamp device. 21b grips the pile 4d, and the first clamp device 21c grips the pile 4e.
In this state, the pile 4b gripped by the chuck device 25 can be press-fitted by taking a reaction force from the existing piles 4a, 4c, 4d, 4e via the clamp devices 21a, 21b, 21c, 34.
That is, as the press-fitting operation, the lowering operation by the elevating drive device (24, 32) of the chuck device 25 holding the pile 4b and the ascending operation by the elevating drive device (24, 32) of the chuck device 25 releasing the pile 4b. By repeating the above steps, the pile 4b is press-fitted into the ground. As described above, a method of rotating the pile 4b at the time of press fitting may be adopted.

In this press-fitting operation, the existing piles 4c (, 4d, 4e) adjacent to the press-fitting position of the pile 4b gripped by the chuck device 25 in one direction (rear in FIG. 1) are clamped by the first clamp device 21a (, 21b, 21c). The existing pile 4a adjacent to the other direction (front in FIG. 1) different from the one direction is gripped by the second clamp device 34, and then the pile 4a is gripped.
Therefore, the moment generated by the force pushing the pile 4b downward and the force pulling the existing piles 4c, 4d, 4e upward as the reaction force, the force pushing the pile 4b downward, and the existing pile as the reaction force. Since the moments generated by the force pulling 4a upward are opposite to each other, at least a part of them cancel each other out, so that a large reaction force can be easily secured while reducing the moments that can be generated by the pressure input and the reaction force. can do. In this way, since the pressure input can be increased, the pile can be press-fitted with high efficiency, and since the inclination due to the above moment is suppressed, the pile can be press-fitted with high accuracy.

Further, if the pile 4b is an existing pile press-fitted into the ground, it can be pulled out.
That is, as the pull-out operation, the ascending operation by the elevating drive device (24, 32) of the chuck device 25 gripping the pile 4b and the descending operation by the elevating drive device (24, 32) of the chuck device 25 releasing the pile 4b. By repeating the above, the pile 4b is pulled out from the ground. As described above, a method of rotating the pile 4b at the time of pulling out may be adopted.
In this pulling operation, the existing piles 4c (, 4d, 4e) adjacent to the pile 4b press-fitted into the ground to be pulled out in one direction (rear in FIG. 1) are clamped by the first clamp device 21a (, 21b, 21c). The existing pile 4a adjacent to the other direction (front in FIG. 1) different from the one direction is gripped by the second clamp device 34, and then this is performed.
Therefore, the moment generated by the force pulling the pile 4b upward and the force pushing the existing piles 4c, 4d, 4e downward as the reaction force, the force pulling the pile 4b upward, and the existing pile as the reaction force. Since the force generated by pushing 4a downward and the moment generated by it are opposite to each other, at least a part of them is offset, and therefore a large reaction force can be easily secured while reducing the moment that can be generated by the pulling force and the reaction force. can do. In this way, the pulling force can be increased, so that the pile can be pulled out with high efficiency.

In order to obtain a large amount of offsetting of the above moments, it is preferable that the first clamp devices 21a, 21b, 21c and the second clamp device 34 are arranged 180 degrees opposite to each other via the chuck device 25 during the press-fitting / pulling operation. .. Therefore, the pile press-fitting / drawing machine 1 is implemented in which the arrangement of the first clamp devices 21a, 21b, 21c, the chuck device 25, and the second clamp device 34 on the horizontal plane coordinates (FIG. 2) can be aligned. Is preferable.

As described above, the chuck device 25 and the first clamp devices 21a, 21b, 21c are variably connected to each other in terms of their relative horizontal plane coordinates (FIG. 2), and the chuck device 25 and the second clamp device are variably connected. With 34, the arrangements on the horizontal coordinates (FIG. 2) relative to each other are variably connected.
This is because such variability makes it possible to deal with cases where the piles 4a, 4b, 4c, 4d, and 4e are not arranged in a straight line or where the arrangement pitches are different. If they are not arranged in a straight line or if the arrangement pitch is different, it may occur due to design intent or construction error.
The arrangement of the chuck device 25 and the first clamp devices 21a, 21b, 21c on the relative horizontal coordinates (FIG. 2) of each other, and the relative of the chuck device 25 and the second clamp device 34 to each other. At least one of the arrangements on the horizontal plane coordinates (FIG. 2) is provided with a drive device that is powered to change the arrangement. It is preferable to provide both. In the case of the present embodiment, the former is configured by the conventional pile press-fit / pull-out machine 2, and the latter is omitted. However, it can be configured by attaching a cylinder device in the front-rear direction and a cylinder device in the left-right direction to the biaxial horizontal movable joint 33. Further, it is also possible to carry out the configuration in which two pile press-fitting / pulling machines 2 are arranged to face each other and the chuck device 25 is shared.

(Specific application example)
Specifically, the pile press-fitting / pulling machine 1 described above can be applied when constructing a loop deadline pile or when constructing the second and subsequent stages of articulated piles. The working operation of the pile press-fitting / pulling machine 1 will be described below using these as examples.

(Construction of loop deadline pile)
The case of constructing the deadline pile of the loop will be described.
The loop referred to here is a loop when piles are arranged and constructed in a loop shape surrounding a predetermined area on the ground, and a loop deadline pile is one of which closes (closes) the loop. It is a stake. The deadline pile of the loop can be described as the pile 4b shown in FIG.
That is, the deadline pile 4b is gripped by the chuck device 25, and the existing pile 4c (, 4d, 4e) forming a loop adjacent to the press-fitting position of the deadline pile 4b in one direction (rear in FIG. 1) is first clamped. The existing pile 4a, which is gripped by the device 21a (, 21b, 21c) and constitutes a loop adjacent to the other direction (forward in FIG. 1) different from the one direction, is gripped by the second clamp device 34, and then the deadline is concerned. The lowering operation of the chuck device 25 holding the pile 4b by the elevating drive device (24, 32) and the ascending operation of the chuck device 25 releasing the deadline pile 4b by the elevating drive device (24, 32) are repeated. The deadline pile 4b is press-fitted into the ground to close the loop.

The process leading up to the loop deadline is as follows.
First, the pile 4a is press-fitted, then the pile 4z is press-fitted, and then the pile 4a is press-fitted by the conventional pile press-fitting / pulling machine 2 in which the reaction force pedestal installed on the ground is gripped by the first clamp devices 21a, 21b, 21c. After that (forward in FIG. 1), a pile is constructed and turns in a loop to press-fit the pile 4e, then the pile 4d, and then the pile 4c.
Next, the deadline pile 4b is gripped by the chuck device 25, the existing pile 4a is gripped by the second clamp device 34, and press-fitting of the deadline pile 4b is started. At the start of this press-fitting, the leading first clamp device 21a is still in a state of gripping the pile 4d two before the deadline pile 4b. After press-fitting the cut-off pile 4b to the extent that the pile press-fit / pull-out machine 2 can be supported, the first clamp devices 21a, 21b, 21c are released, the saddle 20 is raised, and the saddle is held while the cut-off pile 4b is being held by the chuck device. FIG. 1 shows that the existing tubular piles 4c, 4d, 4e are gripped by the first clamp devices 21a, 21b, 21c by the process of advancing the 20, lowering the saddle 20, and re-grasping the first clamp devices 21a, 21b, 21c. Make it a state. Further, the press-fitting operation of the deadline pile 4b is continued. As described above, the deadline pile 4b is press-fitted by taking reaction force on both sides of the deadline pile 4b.
Since not only the deadline pile 4b but also the existing pile 4a is gripped in the process of ascending, advancing, and descending the saddle 20, a high bearing capacity for supporting the pile press-fit / pull-out machine 2 can be obtained, and the deadline pile 4b The forward movement is possible relatively early from the start of press fitting.

(Construction of the second and subsequent stages of articulated piles)
Next, the case of constructing the second and subsequent stages of the articulated pile will be described. Here, the articulated pile is a length in which the upper end of a pile (first pile) that is press-fitted into the ground first and the lower end of a pile (second-stage pile) that is press-fitted into the ground later are aligned with the central axis by a joint. It is a structure connected in the direction. The number of stages is two or more. When constructing a row in which the lower end of the second-stage pile is connected to the upper end of the first-stage pile pressed into the ground and the articulated piles press-fitted into the ground are arranged, the second and subsequent stages of this articulated pile are constructed. The pile press-fitting / pulling machine 1 can be applied to the construction.
That is, in FIG. 1, the pile 4b is used as the second and subsequent one-stage piles (pile that is not the most preceding stage), the one-stage pile 4b is gripped by the chuck device 25, and one direction with respect to the press-fitting position of the one-stage pile 4b. The piles 4c (, 4d, 4e) of the existing steps forming the row adjacent to (rear in FIG. 1) are gripped by the first clamping device 21a (, 21b, 21c), and the other direction (, 21b, 21c) different from the one direction ( The elevating drive device (24, 32) of the chuck device 25 that grips the existing stage piles 4a forming the row adjacent to (in the front in FIG. 1) by the second clamp device 34 and then grips the one stage pile 4b. By repeating the lowering operation of the one-stage pile 4b and the ascending operation of the elevating drive device (24, 32) of the chuck device 25 that released the one-stage pile 4b, the one-stage pile 4b is added to the preceding-stage pile (not shown) to the ground. Press in.

After that, the grip of the chuck device 25 and the second clamp device 34 is released, and the mast 24 is advanced by the operation of the slide base 22 so that the chuck device 25 is arranged above the pile 4a of the existing stage. Similarly, the pile 4a can be press-fitted into the subsequent pile. At that time, the second clamp device 34 grips the pile 4z in front of the pile 4a, and the piles 4c, 4d, 4e are initially gripped by the first clamp devices 21a, 21b, 21c, and then the additional pile is press-fitted into the pile 4a. However, when the additional pile is press-fitted to a extent that the pile press-fit / pull-out machine 2 can be supported, the chuck device 25 grips the additional pile as it is, and the second clamp device 34 grips the pile 4z. The existing tubular piles 4b, 4c, by the process of releasing the grip of the clamping devices 21a, 21b, 21c, raising the saddle 20, moving the saddle 20 forward, lowering the saddle 20, and re-grasping the first clamping devices 21a, 21b, 21c, The pile press-fit / pull-out machine 2 can be advanced until the 4d is gripped by the first clamping devices 21a, 21b, 21c. After that, similarly, the pile press-fit / pull-out machine 1 can self-propell and construct a row with articulated piles.
In the process of ascending, advancing, and descending the saddle 20, not only the additional pile but also the existing pile 4z is gripped, so that a high bearing capacity for supporting the pile press-fit / pull-out machine 2 can be obtained, and the press-fitting of the additional pile is started. It is possible to move forward relatively early.

In the above embodiment, three clamp devices are arranged on one side of the chuck device and one clamp device is arranged on the opposite side, but one clamp device is arranged on one side of the chuck device and the other side. A configuration in which one clamp device is arranged, two clamp devices are arranged on one side of the chuck device, two clamp devices are arranged on the opposite side, two clamp devices are arranged on one side of the chuck device, and the other side is arranged. It may be carried out in a configuration in which one clamp device is arranged, or in any other combination.
In the above embodiment, the second clamp device 34 grips the upper end portion of the existing pile by its operation, thereby connecting the upper end portion of the existing pile and the chuck device 25 to the elevating cylinder device 32 and the biaxial horizontal movable joint. It was connected via 33. Notwithstanding this, since it is sufficient that the upper end of the existing pile and the chuck device 25 can be connected via the elevating cylinder device 32 (further, if applicable, the biaxial horizontally movable joint 33), the connecting portion is replaced with the second clamp device 34. May be supported at the lower end of the elevating cylinder device 32, and the connecting portion may be fixed to the upper end portion of the existing pile by welding or the like so as to withstand the reaction force at the time of press-fitting the pile. As the configuration of the connecting portion, it is preferable that the connecting portion has a plate member having an appropriate size to be placed on the upper end of the existing pile. This plate member is hinged to the lower end of the elevating cylinder device 32. By fixing the plate member and the upper end of the existing pile to each other by welding or the like, the upper end of the existing pile and the chuck device 25 can be connected via the elevating cylinder device 32. The connection can be released by cutting the welded portion.

When there is no existing pile in front of the chuck, the form shown in FIG. 6 is implemented. That is, as shown in FIG. 6, the pile press-fitting / pulling machine 1B supports the grounding member 36 at the lower end of the elevating cylinder device 32 instead of the second clamp device 34, and the lower surface of the grounding member 36 is on the surface of the ground G. By abutting, the reaction force at the time of pulling out the pile is applied to the front side of the chuck device 25.
The grounding member 36 has a plate-shaped main body and is hinged to the lower end of the elevating cylinder device 32. If the grounding member 36 is also used as the connecting portion, it is possible to save the trouble of replacing the grounding member 36 at the time of press fitting and at the time of pulling out.
The pulling operation by the pile press-fitting / pulling machine 1B to which the grounding member 36 is applied includes an ascending operation by the elevating drive device (24, 32) of the chuck device 25 holding the pile 4b and an elevating operation of the chuck device 25 having released the pile 4b. The pile 4b is pulled out from the ground by repeating the lowering operation by the drive device (24, 32). As described above, a method of rotating the pile 4b at the time of pulling out may be adopted.
In this pulling operation, the existing piles 4c (, 4d, 4e) adjacent to the pile 4b press-fitted into the ground to be pulled out in one direction (rear in FIG. 6) are clamped by the first clamping device 21a (, 21b, 21c). The grounding member 36 is brought into contact with the surface of the ground G adjacent to the ground G in another direction (forward in FIG. 6) different from the one direction.
Therefore, the moment generated by the force pulling the pile 4b upward and the force pushing the existing piles 4c, 4d, 4e downward as the reaction force, the force pulling the pile 4b upward, and the ground contact member as the reaction force. Since the moment generated by the force pushing the surface of the ground G downward by 36 is opposite to each other, at least a part thereof is canceled out, and therefore a large reaction is reduced while reducing the moment that can be generated by the pulling force and the reaction force. The force can be easily secured. In this way, the pulling force can be increased, so that the pile can be pulled out with high efficiency.
With the above-mentioned pile press-fit / pull-out machine 1B, before pulling out the pile 4b, the pile press-fit / pull-out machine 2 is retracted to hold the pile 4d with the clamp device 21a, then the pile 4b is pulled out, and then the pile 4c. Since there are no piles on the front side of the pile, the clamp devices 21a, 21b, 21c and the grounding member 36 can similarly apply a reaction force to pull out the pile 4c. Hereinafter, the withdrawal can be performed while sequentially retreating in the same manner.

1 Pile press-fitting / pulling machine (invention)
2 Pile press-fitting / pulling machine (conventional technology part)
3 Chuck front unit 4 Tubular piles 21a, 21b, 21c First clamp device 24, 32 Lifting cylinder device (lifting drive device)
25 Chuck device 31 Frame 33 2-axis horizontal movable joint 34 Second clamp device

Claims (1)

A clamp device that grips the upper end of an existing pile that has been press-fitted into the ground,
A grounding member that comes into contact with the surface of the ground,
A chuck device having an opening for inserting the pile up and down and pressing the side surface of the pile inserted through the opening from the outside to grip the pile.
A lifting drive device for raising and lowering the chuck device with respect to the clamp device and the grounding member is provided.
As the elevating drive device, a first elevating drive device for elevating and lowering the chuck device with respect to the clamp device and a second elevating drive device for elevating and lowering the chuck device with respect to the grounding member are separately provided. Have and
The first elevating drive device is provided by connecting the clamp device and the chuck device without going through the second elevating drive device.
The second elevating drive device is provided by connecting the grounding member and the chuck device without going through the first elevating drive device.
The existing pile to be pulled out is gripped by the clamping device in one direction with respect to the existing pile to be pulled out, and the grounding member is brought into contact with the surface of the ground adjacent to the existing pile to be pulled out in another direction different from the one direction. The ascending operation of the chuck device holding the pile by the first and second elevating drive devices and the lowering operation of the chuck device that released the existing pile to be pulled out by the first and second elevating drive devices. A pile extraction machine configured to be able to withdraw the pile from the ground by repeating.

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