JP5579900B1 - Self-propelled adapter and pile construction method - Google Patents

Abstract

[PROBLEMS] To reduce the construction period and cost by using an existing pile press-in machine when piles are continuously buried at an interval of at least the pile diameter.
A self-propelled adapter 10 having a cylindrical body at least at two places in the front and rear, and one cylindrical body 1 disposed on the rear side is attached to a pile head Pt of a pile P that has been press-fitted. In this state, the clamp device 11 of the pile presser 100 has a structure capable of holding the pile P, and the other cylindrical body 2 arranged on the front side is gripped by the chuck device 15 of the pile presser 100. By using the self-propelled adapter 10 having a structure capable of holding the lowering device 50 on the cylindrical body 2 in a state where the lowering device 50 is connected, the existing pile presser 100 is used. Thus, when the pile P is continuously buried at least at an interval equal to or greater than the pile diameter, the construction period can be shortened and the construction cost can be reduced.
[Selection] Figure 1

Description

  The present invention relates to a self-propelled adapter and a pile construction method.

As a method for continuously constructing piles, a construction method using a pile press-fitting and pulling machine is known in which a head of an embedded pile is grabbed and a new pile is embedded with a static load by using it as a reaction force.
When piles such as deterrent piles, foundation piles, continuous wall reinforcement piles, etc. are continuously buried with a gap of at least the pile diameter using an existing pile presser, dummy short piles are placed between the piles. There are cases in which a method of pulling out a dummy short pile after press-fitting and passing through a pile presser is employed, but this method has a problem that the construction period and construction cost increase.

  On the other hand, the pile gripping body (clamp) is arranged in two parts in the front and rear, and there is provided an advancing / retreating means for extending and retracting the other half by avoiding the pile head of the existing pile by extending and contracting between them There has been proposed a pile press-in machine in which a pair of pile gripping bodies adjacent to each other is configured to be capable of simultaneously gripping one existing pile by a shortening operation (see, for example, Patent Document 1). According to this pile press-in machine, a plurality of piles can be continuously buried with an interval equal to or greater than the pile diameter without using a dummy short pile.

JP 2000-31880 A

  However, since the pile press-in machine of the above-mentioned patent document 1 divides the pile gripping body into two parts in the front and back, and provides advancing and retreating means between them, the mechanism is complicated compared to the existing pile press-in machine. The operation of the machine is complicated, and it is difficult to reduce the weight of the machine.

  An object of the present invention is to use an existing pile press-in machine to shorten the construction period and reduce the construction cost when the piles are continuously buried at an interval of at least the pile diameter.

In order to solve the above problems, the invention described in claim 1
It is a self-propelled adapter that is used by placing it on the pile head during the press-fitting construction of the pile,
It has a cylindrical body at least at two places in the front and rear,
One cylindrical body arranged on the rear side has a structure in which the clamp device of the pile press-in machine can hold the pile in a state attached to the pile head of the pile that has been press-fitted,
The other cylindrical body arranged on the front side has a structure capable of holding the member on the cylindrical body in a state in which the predetermined member grasped by the chuck device of the pile press-in machine is connected. And

The invention according to claim 2 is the self-propelled adapter according to claim 1,
The said one cylindrical body is provided with the peripheral part which covers the outer peripheral surface of the said pile head part, and the edge part which extends inward from the said peripheral surface part and rests on the upper surface of the said pile head part, It is characterized by the above-mentioned.

The invention according to claim 3 is the self-propelled adapter according to claim 1 or 2,
The one cylindrical body is provided with a locking member that contacts the pile head and locks the one cylindrical body to the pile head.

The invention according to claim 4 is the self-propelled adapter according to any one of claims 1 to 3,
The one cylindrical body has a fixed part fixed to the other cylindrical body side and a movable part provided so that a gap through which the pile head can pass can be formed. It is characterized by being.

The invention according to claim 5 is a pile construction method,
The step of attaching the one cylindrical body of the self-propelled adapter according to claim 1 to a pile head of a leading pile in a plurality of piles buried in the ground by a pile presser;
Connecting a predetermined member grasped by the chuck device of the pile press-fitting machine to the other cylindrical body;
The clamp device of the pile presser is released, the pile presser is advanced by the pitch of the clamp device, and the pile head to which the one cylindrical body is attached is moved by the clamp device on the leading side in the traveling direction. Step to grab,
After removing the predetermined member from the chuck device, press-fitting a new pile inserted through the chuck device into the ground ahead of the other cylindrical body; and
Removing the self-propelled adapter from the pile head,
By repeating these steps, the piles are continuously embedded at intervals.

  ADVANTAGE OF THE INVENTION According to this invention, when burying a pile continuously with the space | interval more than a pile diameter at least, an existing pile press-in machine can be used and a work period shortening and construction cost reduction can be aimed at.

It is the top view (a) which shows the adapter for self-propelling concerning the present invention, and its sectional view (b). It is explanatory drawing regarding the step 1 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding the step 2 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding the step 3 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding the step 4 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding step 5 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding step 6 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding the step 7 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding step 8 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding step 9 in the pile construction method using the adapter for self-propelled. It is explanatory drawing regarding step 10 in the pile construction method using the adapter for self-propelled. It is sectional drawing which shows the modification of the adapter for self-propelled. It is a top view which shows the other modification of the adapter for self-propelled, and has shown the state (a) at the time of use, and the attachment or detachment state (b) to a pile head.

Hereinafter, with reference to drawings, an embodiment of a self-propelled adapter and a pile construction method using the self-propelled adapter according to the present invention will be described in detail.
The self-propelled adapter is used by being placed on the pile head at the time of press-fitting construction of the pile, and is configured to have a cylindrical body at least in two front and rear positions.

As shown in FIGS. 1 (a) and 1 (b), the self-propelled adapter 10 includes one cylindrical body 1 disposed on the rear side during press-fitting of a pile (steel pipe pile), and another disposed on the front side. A cylindrical body 2 is provided, and one cylindrical body 1 and another cylindrical body 2 are integrally connected by a fixed body 3.
The one cylindrical body 1 and the other cylindrical body 2 are arranged side by side so that their central axes are parallel to each other.

One cylindrical body 1 has a structure in which a clamp device 11 of a pile press-in machine 100 to be described later can grip the pile P in a state of being attached to a pile head Pt of the pile P that has been press-fitted.
Specifically, one cylindrical body 1 includes a cylindrical peripheral surface portion 1b that covers the outer peripheral surface of the pile head portion Pt, and an edge portion that extends inward from the upper end of the peripheral surface portion 1b and rests on the upper surface of the pile head portion Pt. 1a is provided.
Since this edge portion 1a protrudes inward by the thickness of the pile P from the peripheral surface portion 1b, the clamp of the pile presser 100 is placed in the pile head Pt with one cylindrical body 1 attached to the pile head Pt. The device 11 can be inserted and the pile P can be gripped by the clamping device 11.

The other cylindrical body 2 has a structure capable of holding the member on the cylindrical body 2 in a state where a predetermined member (for example, the lowering device 50) gripped by the chuck device 15 of the pile press-in machine 100 described later is connected. have.
Specifically, the other cylindrical body 2 can be loaded at the lower end portion of a predetermined member (for example, the lowering device 50), and the lower end portion is loaded into the cylindrical body 2 in a predetermined amount. The large-diameter portion that is thicker than the portion has a cylindrical shape that abuts against the upper surface of the cylindrical body 2.
That is, when a predetermined member grasped by the chuck device 15 is inserted and connected to another cylindrical body 2 from above, the other cylindrical body 2 supports the predetermined member and holds it on the cylindrical body 2. Can do.

Moreover, as shown in FIG.1 (b), the locking member 4 which contact | abuts the pile head Pt inside the one cylindrical body 1, and latches the one cylindrical body 1 to the pile head Pt. Is provided.
As the locking member 4, for example, a metal claw-like member, a rubber sheet-like member, or the like can be used. When this locking member 4 abuts against the pile head Pt, the frictional resistance between the one cylinder 1 and the pile head Pt increases, and the cylinder 1 (self-propelled adapter) against the pile head Pt. 10) can be stabilized. Moreover, it can prevent that the cylindrical body 1 remove | deviates from the pile head Pt, and can prevent that the adapter 10 for self-propelled falls.

Next, the existing pile press-in machine 100 used for press-in construction of the pile P will be described.
As shown in FIGS. 2 to 11, the pile press-in machine 100 is a machine that holds a predetermined pile (steel pipe pile) P with the chuck device 15 and press-fits it into the ground, and the existing pile P that has already been press-fit into the ground. A saddle 12 having a plurality of (three in this embodiment) clamping devices 11 for holding and supporting the pile head Pt, a slide base 13 movable back and forth with respect to the saddle 12, and a slide base 13. A leader mast 14 that can turn left and right, a chuck device 15 attached to the front surface of the leader mast 14 so as to be movable up and down, a main hydraulic cylinder 16 that drives the chuck device 15 up and down with respect to the leader mast 14, and the like.

The clamp device 11 is provided on the lower surface of the saddle 12. The clamp device 11 is expanded by driving a hydraulic cylinder (not shown) in a state where it is inserted into the pile head Pt of the existing pile P that has been previously press-fitted, and grips the pile head Pt of the pile P. can do. That is, the clamp device 11 functions as a fixing means that fixes the pile press-fitting machine 100 to the upper end portion of the existing pile P by grasping the pile head Pt of the existing pile P.
In particular, the clamp device 11 takes the reaction force from the existing pile P that is held and supported, and the pile presser 100 can be inserted into the pile P so that the pile presser 100 can press-fit the pile P newly. Fixed to be installed.

  The slide base 13 moves forward with respect to the saddle 12 and moves the chuck device 15 horizontally to the front side, so that the new pile is moved ahead of the existing pile P that has already been press-fitted without moving the saddle 12. Can be press-fitted sequentially.

  The leader mast 14 can bend to the right or to bend the direction of the row of piles that are sequentially press-fitted by turning the chuck device 15 by turning left and right with respect to the slide base 13. It is possible.

  The chuck device 15 is in a state in which the back side thereof is fitted to the front side of the leader mast 14 so as to be movable up and down, and is driven up and down by a main hydraulic cylinder 16 connected to the leader mast 14 and the chuck device 15. ing. The chuck device 15 can grip the pile P inserted into the device with a holding claw that is operated by driving a hydraulic cylinder (not shown).

  Then, when the pile P held and held by the chuck device 15 is press-fitted into the ground, the lifting range of the chuck device 15 is limited. Therefore, holding the pile P and lowering the chuck device 15; The chuck device 15 is repeatedly lifted and released. Thus, the press-in of the pile P is repeated for each stroke in which the chuck device 15 moves up and down, and the pile P can be pressed into the ground deeper than the lift range of the chuck device 15.

The above-mentioned pile press-in machine 100 has an operation of press-fitting a new pile P ahead of the existing pile P with the chuck device 15, an operation of gripping and releasing the pile head Pt of the existing pile P by the clamp device 11, and a leader By combining the vertical movement operation of the chuck device 15 with respect to the mast 14 and the forward / backward movement operation of the slide base 13 with respect to the saddle 12, it is possible to self-propell and move on the pile row composed of the existing piles P.
In addition, since the operation | movement which the pile press-fit machine 100 self-propels on a pile row is known, it does not elaborate on here.

  Next, the procedure of the pile construction method using the self-propelled adapter 10 will be described.

First, the pile P is press-fitted into the ground by the pile press-in machine 100 installed on the existing pile P.
As shown in FIG. 2, the pile press-in machine 100 installed on the existing pile P takes a reaction force from the existing pile P gripped by the clamp device 11 and places a new pile P gripped by the chuck device 15 on the ground. Press fit inside (step 1).
Here, the pile press-in machine 100 presses a new pile P into the ground at an interval of at least the pile diameter from the existing pile P at the top of the pile row. The pile row (existing pile P) in the figure is a pile row in which a plurality of piles P are continuously embedded with an interval of at least the pile diameter. In addition, the pile press-fit machine 100 is installed on the pile row in a state where the pile head Pt of the existing pile P is held by the clamp device 11 on the leading side in the traveling direction and the clamp device 11 on the rear end side.

  Next, as shown in FIG. 3, a cylindrical lowering device 50, which is a predetermined member, is built on the pile P gripped by the chuck device 15 (step 2).

Next, as shown in FIG. 4, the pile P is continuously press-fitted, and the lowering device 50 connected to the pile P is inserted into the chuck device 15. Then, the pile P is press-fitted to a predetermined position (planned level) by the pile press-fitting machine 100 through the lowering device 50 inserted through the chuck device 15 (step 3).
Here, the pile P that is connected to the driving device 50 and press-fitted to a predetermined position (plan level) becomes an existing pile P that constitutes a pile row.

Next, as shown in FIG. 5, after releasing the holding of the pile head Pt by the clamp device 11 of the pile press-in machine 100, the main hydraulic cylinder 16 is driven to drive the chuck device 15 that holds the lowering device 50. The pile presser 100 on the leader mast 14 side is raised. Subsequently, after the saddle 12 is moved forward with respect to the slide base 13, the pile presser 100 is lowered to insert the clamp device 11 into the pile head Pt of the existing pile P, and the pile presser 100 is connected to the clamp device 11. Is advanced by one pitch (step 4).
Here, the pile press-in machine 100 is installed on the pile row in a state in which the pile head Pt of the existing pile P is gripped by the central clamping device 11.

  Next, as shown in FIG. 6, the chuck device 15 that holds the lowering device 50 is raised, and the lowering device 50 is pulled up and removed from the pile head Pt. One cylindrical body 1 of the self-propelled adapter 10 is attached to Pt (step 5).

  Next, as shown in FIG. 7, after the slide base 13 is moved forward with respect to the saddle 12, the chuck device 15 is lowered, and the lowering device 50 gripped by the chuck device 15 is changed to the other of the self-propelled adapter 10. Connect to the cylindrical body 2 (step 6).

Next, as shown in FIG. 8, after releasing the holding of the pile head Pt by the clamp device 11 of the pile press-fitting machine 100, the chuck device 15 that grips the lowering device 50 by driving the main hydraulic cylinder 16. The pile presser 100 on the leader mast 14 side is raised. Subsequently, after the saddle 12 is moved forward with respect to the slide base 13, the pile presser 100 is lowered to insert the clamp device 11 into the pile head Pt of the existing pile P, and the pile presser 100 is connected to the clamp device 11. Is advanced by one pitch (step 7).
Here, the pile press-in machine 100 is holding the pile head Pt of the pile P to which the one cylindrical body 1 is attached with the clamp device 11 on the leading side in the traveling direction.
That is, step 7 is a process in which the pile presser 100 is advanced by the pitch of the clamp device 11 and the pile head Pt to which the one cylindrical body 1 is attached is gripped by the clamp device 11 on the leading side in the traveling direction. It is.
And the pile press-fit machine 100 is installed on the pile row in a state where the pile head Pt of the existing pile P is gripped by the clamp device 11 on the leading side in the traveling direction and the clamp device 11 on the rear end side.

Next, as shown in FIG. 9, after the dropping device 50 is removed from the chuck device 15 and removed, a new pile P is inserted into the chuck device 15, and the new pile P is inserted ahead of the other cylindrical body 2. (Step 8).
Here, the pile press-in machine 100 advances the slide base 13 with respect to the saddle 12, and the pile press-in machine 100 transfers a new pile P gripped by the chuck device 15 from the existing pile P at the top of the pile row to at least the pile diameter. It press-fits into a position with the above interval.
The pile press-in machine 100 presses the pile P into the ground until it becomes possible to obtain a support force from the new pile P gripped by the chuck device 15.

Next, as shown in FIG. 10, after releasing the holding of the pile head Pt by the clamp device 11 of the pile press-in machine 100 in a state where the support force can be obtained from the new pile P, the main By driving the hydraulic cylinder 16, the pile presser 100 on the leader mast 14 side is raised with respect to the chuck device 15 that has grasped the new pile P.
And the adapter 10 for self-propelled is removed from the pile head Pt in the state which the clamp apparatus 11 separated from the pile head Pt (step 9).

Next, as shown in FIG. 11, after removing the self-propelled adapter 10 from the pile head Pt, the pile on the leader mast 14 side with respect to the chuck device 15 that has grasped the new pile P by driving the main hydraulic cylinder 16. The press-fitting machine 100 is lowered, and the clamp device 11 is inserted into and held by the pile head Pt of the existing pile P (step 10).
Here, the pile press-in machine 100 is installed on the pile row in a state where the pile head Pt of the existing pile P is gripped by the clamp device 11 on the leading side in the traveling direction and the clamp device 11 on the rear end side. It is possible to press-fit a new pile P gripped by the device 15 into the ground.

That is, in step 10 (see FIG. 11), the pile presser 100 is lowered, the pile head Pt of the existing pile P is gripped by the clamp device 11, and the pile presser 100 is placed on the pile row (existing pile P). Once installed, the process returns to step 1 (see FIG. 2), which is a process of press-fitting a new pile P gripped by the chuck device 15 into the ground.
In this way, by repeating Step 1 to Step 10 described above, the piles P can be continuously embedded at an interval of at least the pile diameter.
In particular, by using the self-propelled adapter 10 in the process in which the pile presser 100 press-fits a plurality of piles P, the pile presser 100 is a pile row composed of existing piles P that are continuously arranged with an interval equal to or greater than the pile diameter. The top can be easily self-propelled, and the piles P can be press-fitted continuously.

  As described above, if the self-propelled adapter 10 according to the present invention is used, the pile presser 100 can be used without using a dummy short pile even when a plurality of piles P are press-fitted at intervals equal to or greater than the pile diameter. The pile P made of a plurality of existing piles P can be easily self-propelled and the piles P can be press-fitted continuously.

  Therefore, when using the existing pile press-in machine 100 and continuously burying the pile P with an interval of at least the diameter of the pile, the construction using the self-propelled adapter 10 is performed, thereby shortening the construction period and cost. Savings can be achieved.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 12, a cylinder 5 as a locking member may be provided in one cylindrical body 1 of the self-propelled adapter 10. The cylinder 5 is a device provided with a head (cylinder head) that can advance and retract. A part of the cylinder 5 provided in one cylindrical body 1 is accommodated in the fixed body 3.
If the locking member provided in one cylindrical body 1 is the cylinder 5, the one cylindrical body 1 is attached to the pile head Pt in a state where the head of the cylinder 5 is retracted from the inner wall surface of the cylindrical body 1 into the cylindrical body. After the cylindrical body 1 is attached to the pile head Pt, the head of the cylinder 5 can be pushed out from the inner wall surface of the cylindrical body 1 and brought into contact with the pile head Pt.
If this cylinder 5 is a self-propelled adapter 10 provided in one cylindrical body 1, it can be easily attached to the pile head Pt, and the frictional resistance force between the one cylinder 1 and the pile head Pt can be reduced. It can increase reliably and the attitude | position of the cylindrical body 1 (self-propelled adapter 10) with respect to the pile head Pt can be stabilized more.

Further, as shown in FIGS. 13A and 13B, one cylindrical body 1 of the self-propelled adapter 10 is fixed to a fixed body 3 on the other cylindrical body 2 side, and a pile. The structure which has the movable part 7 provided so that the gap | interval which can pass the head Pt can be formed between the fixed parts 6 may be sufficient.
The fixed portion 6 and the movable portion 7 have a shape that bisects a cylindrical body.
One end of the fixed portion 6 and the movable portion 7 is connected by a hinge portion 8, and the movable portion 7 is pivotally supported by the fixed portion 6 so as to be rotatable.
At the other end of the fixed portion 6 and the movable portion 7, an engaging portion 9 that can be engaged with each other is provided.
By engaging the engaging portion 9 of the fixed portion 6 and the engaging portion 9 of the movable portion 7, a cylindrical body composed of the fixed portion 6 and the movable portion 7 is obtained.
The self-propelled adapter 10 should be used in a state where the portion where the fixed portion 6 and the movable portion 7 are engaged is fixed with a bolt or the like, depending on the coupling strength of the engaging portion 9. Is preferred. If the engaging portions 9 are fixed to each other, the fixed portion 6 and the movable portion 7 are separated while the self-propelled adapter 10 is being used, and the single cylinder 1 (the self-propelled adapter 10 is separated from the pile head Pt. ) Can be prevented from coming off.

And the one cylindrical body 1 which consists of the fixed part 6 and the movable part 7 cancel | released the engagement of the engaging part 9, and rotated the movable part 7 so that each engaging part 9 might be spaced apart. At this time, a gap larger than the pile diameter of the pile P can be formed between the fixed portion 6 and the movable portion 7.
If a gap larger than the pile diameter of the pile P is formed between the fixed part 6 and the movable part 7, the pile head Pt can easily pass between the fixed part 6 and the movable part 7. One cylindrical body 1 can be attached to and detached from the pile head Pt.
For example, in the above embodiment, when removing the self-propelled adapter 10 from the pile head Pt in Step 9 (see FIG. 10), the pile presser 100 is raised from the existing pile P. However, the fixed portion 6 and the movable portion 7, the self-propelled adapter 10 having a single cylindrical body 1 is removed from the pile head Pt with the pile presser 100 installed on the existing pile P. be able to.
Moreover, in the said embodiment, when attaching the adapter 10 for self-propelled to the pile head Pt in step 5 (refer FIG. 6), the chuck apparatus 15 was raised and the lowering apparatus 50 was pulled up from the pile head Pt. Is a self-propelled adapter 10 having a single cylindrical body 1 composed of a fixed part 6 and a movable part 7, the pile head Pt in a state in which the driving device 50 is built in the existing pile P The self-propelled adapter 10 can be attached to
Thus, if it is the self-propelled adapter 10 of the structure provided with the one cylindrical body 1 which consists of the fixed part 6 and the movable part 7, the one cylindrical body 1 (self-propelled adapter 10) in the pile head Pt. When attaching / detaching, the pile press-in machine 100 can be lifted from the existing pile P, and the work of pulling up the lowering device 50 from the pile head Pt can be omitted, so that the construction period can be further shortened.

In the above embodiment, the self-propelled adapter 10 having two cylindrical bodies has been described as an example. However, the present invention is not limited to this, and has three or more cylindrical bodies. It may be a thing.
Moreover, the dimension between cylindrical bodies is arbitrary and what is necessary is just to change suitably according to the space | interval of the existing pile P in the pile row | line to construct.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 One cylindrical body 1a Edge 1b Peripheral surface part 2 Other cylindrical bodies 3 Fixed body 4 Locking member 5 Cylinder (locking member)
6 fixed portion 7 movable portion 8 hinge portion 9 engaging portion 10 self-propelled adapter 50 driving device (predetermined member)
100 Pile Pressing Machine 11 Clamping Device 12 Saddle 13 Slide Base 14 Leader Mast 15 Chuck Device 16 Main Hydraulic Cylinder P Pile Pt Pile Head

Claims (5)

It is a self-propelled adapter that is used by placing it on the pile head during the press-fitting construction of the pile,
It has a cylindrical body at least at two places in the front and rear,
One cylindrical body arranged on the rear side has a structure in which the clamp device of the pile press-in machine can hold the pile in a state attached to the pile head of the pile that has been press-fitted,
The other cylindrical body arranged on the front side has a structure capable of holding the member on the cylindrical body in a state in which the predetermined member grasped by the chuck device of the pile press-in machine is connected. A self-propelled adapter.   The said one cylindrical body is provided with the peripheral surface part which covers the outer peripheral surface of the said pile head part, and the edge part extended inside from the said peripheral surface part and mounted on the upper surface of the said pile head part. 1. The self-propelled adapter according to 1.   The said one cylindrical body is provided with the latching member which contact | abuts to the said pile head part, and latches the said one cylindrical body to the said pile head part. The self-propelled adapter described.   The one cylindrical body has a fixed part fixed to the other cylindrical body side and a movable part provided so that a gap through which the pile head can pass can be formed. The self-propelled adapter according to any one of claims 1 to 3, wherein the adapter is self-propelled. The step of attaching the one cylindrical body of the self-propelled adapter according to claim 1 to a pile head of a leading pile in a plurality of piles buried in the ground by a pile presser;
Connecting a predetermined member grasped by the chuck device of the pile press-fitting machine to the other cylindrical body;
The clamp device of the pile presser is released, the pile presser is advanced by the pitch of the clamp device, and the pile head to which the one cylindrical body is attached is moved by the clamp device on the leading side in the traveling direction. Step to grab,
After removing the predetermined member from the chuck device, press-fitting a new pile inserted through the chuck device into the ground ahead of the other cylindrical body; and
Removing the self-propelled adapter from the pile head,
A pile construction method characterized in that piles are continuously buried at intervals by repeating these steps.

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