Hydraulic press

Abstract

To provide a pile press-in machine and a pile supply method which can move a pile above a chuck without requiring an operator.SOLUTION: A pile press-in machine 1 for pressing-in a pile P into the ground includes an arm member 40 arranged in the vicinity of a chuck 25 gripping a pile P pressed-in into the ground, wherein the arm member 40 is rotatable at a position separated forward from the chuck 25 and at a position in the vicinity of the chuck 25, and the arm member 40 is formed in such a curved shape as to project frontward in the state of being moved at the position in the vicinity of the chuck 25. After the pipe P is carried-in into the vicinity of the arm member 40 in the state where the arm member 40 is separated forward from the chuck 25, the arm member 40 is rotated at the position in the vicinity of the chuck 25, and thereby the pipe P pressed-in into the ground can be smoothly moved above the chuck 25.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pile driving machine for driving piles into the ground and a method for supplying piles in the pile driving machine.

Background Art

[0002] As a method of driving and embedding various piles such as steel pipe piles and section steels into the ground, a construction technique is known in which the upper end of an existing pile embedded in the ground in advance is grasped by a clamp to obtain a reaction force, and a chuck holding the pile is lifted and lowered to sequentially press new piles into positions adjacent to the existing pile.

[0003] The pile driving machine used for such construction has a saddle fixed to an existing pile via a plurality of clamps and a slide frame movable in the front-rear direction with respect to the saddle. A liftable chuck is attached to a leader mast rotatably mounted on the slide frame. As piles used for pressing, piles such as steel sheet piles, steel pipe sheet piles, steel pipe piles, and concrete piles are known. Then, the chuck is positioned at a predetermined position with respect to the saddle, and a pile carried in to a predetermined position by being suspended by a crane or the like is grasped by the chuck, and the chuck is lifted and lowered along the leader mast to press the pile into the ground.

[0004] Here, it is difficult to support only by hand the movement of a pile carried in by being suspended by a crane or the like up to the chuck. If the chuck is enlarged, it becomes easier to insert the pile into the chuck, but the entire pile driving machine becomes large and heavy. Therefore, in order to facilitate the conveyance of a pile suspended by a crane or the like to a predetermined position in the pile driving machine, for example, Patent Document 1 discloses a pile positioning and guiding device in which a pair of left and right guide rods are attached to the space above the chuck so as to flare toward the tip side. In this positioning and guiding device, the pile is being carried in with one of the pair of left and right guide rods extended and the other guide rod contracted.

[0005] Also, the applicant of the present application has previously filed a patent document 2Disclosed is a pile press-in machine provided with an arm member extending forward from one of the left and right side positions with respect to the chuck.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in the technique disclosed in Patent Document 1, since the pair of left and right guide rods are flared, there is a risk that the guide rods may interfere during construction in the vicinity of the structure. In addition, the pile insertion position is limited to the front of the chuck, and piles cannot be carried in above the chuck, resulting in a longer pile carrying position and a larger working space being required. Conventionally, when moving a pile above the chuck, a worker is required to engage in the set-up in order to smoothly guide the pile. The efficiency of the work depends on the skill level of the worker, and there is a certain degree of danger, and it is also necessary to install a working scaffold or the like.

[0008] In view of this point, the present invention has been made, and an object thereof is to provide a pile press-in machine and a pile supply method capable of safely and efficiently moving a pile above a chuck without requiring a worker.

Means for Solving the Problems

[0009] To achieve the above object, according to the present invention, there is provided a pile press-in machine for pressing a pile into the ground, comprising an arm member disposed in the vicinity of a chuck for gripping a pile to be pressed into the ground, the arm member is provided with driving means for at a position separated from the chuck forward and at a position close to the chuck rotating it, and in a state where the arm member has moved to a position close to the chuck,so as to substantially coincide with the opening of the chuck, There is provided a pile press-in machine characterized in that it has a curved shape protruding forward of the chuck.

[0010] In this pile press-in machine, it may have a buffer member disposed inside the arm member. Further, the arm member may be inclined downward or upward from the base end portion of the arm to the tip end portion of the arm. Further, the arm member may be interchangeable between the left side and the right side of the chuck.

[0011] Further, according to the present invention, there is provided a method for supplying a pile to a pile press-in machine that presses a pile into the ground, the method including an arm member disposed in the vicinity of a chuck that grips the pile to be pressed into the ground, and the arm member is provided with driving means for at a position away from the chuck forward and at a position close to the chuck rotating it, and In a state where the arm member has moved to a position close to the chuck, so as to substantially coincide with the opening of the chuck, it has a curved shape protruding forward of the chuck, and in a state where the arm member is separated forward from the chuck, after a pile is carried into the vicinity of the arm member, the arm member is rotated to a position close to the chuck. There is provided a method for supplying a pile in a pile press-in machine, characterized by this.

[0012] In this supply method, in a state where the arm member is separated forward from the chuck, the arm member has a buffer member located inside the arm member, and when the pile carried into the vicinity of the arm member abuts against the buffer member and the buffer member is pushed, the arm member may be rotated in a direction close to the chuck.

Advantages of the Invention

[0013] According to the present invention, in a state where the arm member is separated forward from the chuck, after a pile is carried into the vicinity of the arm member, the arm member is rotated to a position close to the chuck, so that the pile to be pressed into the ground can be smoothly moved above the chuck.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the pile driver 1 according to an embodiment of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[0016] Also, in this specification, the front direction is the direction in which the pile jacking machine 1 advances the jacking construction (in the posture with the leader mast 20 facing forward), the right side is the front and the left side is the rear in FIGS. 1 to 10. The left-right direction is determined in the state of looking down on the advancing direction of the jacking construction. In FIG. 1, the front side of the paper (the perpendicular upper side with respect to the paper) is the right side, and the back side of the paper (the perpendicular lower side with respect to the paper) is the left side. In FIGS. 2 to 10, the lower side is the right side and the upper side is the left side. The inner side is the direction from the outer side (right side or left side) toward the center line L of the pile jacking machine 1 (shown in FIGS. 2 to 10).

[0017] As shown in FIGS. 1 to 3, a plurality of clamps 11 are provided at both lower portions of the saddle 10 that forms the main body of the pile jacking machine 1 according to the embodiment of the present invention. The clamp 11 grips the upper end portion of the existing pile P that has already been jacked in and fixes the saddle 10 to the upper portion of the pile P. In FIG. 1, the upper end portions of the three existing piles P are gripped by the clamp 11 to fix the saddle 10, and a state where a new one pile P has been completely jacked in is shown in front of those three piles P. Also, in the embodiment, as an example of the pile P, a U-shaped steel sheet pile is shown.

[0018] On the upper portion of the saddle 10, a slide frame 12 that is slidable in the front-rear direction with respect to the saddle 10 is provided. On the slide frame 12, a leader mast 20 serving as a swivel base is configured to be rotatable with respect to the slide frame 12 around the central portion of the slide frame 12. The rotation of the leader mast 20 is performed by a rotation drive source (not shown) such as a motor provided on, for example, the lower surface side of the leader mast 20. In FIGS. 1 to 10, a state where the leader mast 20 is facing forward (front) is shown. Also, in this specification, each direction is described based on the state where the leader mast 20 is facing forward (front) in this way.

[0019] In front of the leader mast 20, a chuck 25 that can move up and down along the lifting guide 21 is attached. The chuck 25 has a configuration in which a chuck body 27 is mounted on a chuck frame 26 that is movably attached to the lifting guide 21 in front of the leader mast 20. The entire chuck 25 (chuck frame 26 and chuck body 27) moves up and down integrally by the telescopic operation of the main cylinder 30.

[0020] The chuck body 27 is rotatably mounted with respect to the chuck frame 26. The chuck body 27 has a generally cylindrical shape as a whole, and an opening 31 that is U-shaped in plan view and penetrates vertically is provided inside the chuck body 27. A pile P, which is a U-shaped steel sheet pile, is passed through this opening 31.

[0021] A fixed claw 32 and a movable claw 33 are provided horizontally opposite to each other at the lower inner side of the chuck body 27. The movable claw 33 approaches and separates from the fixed claw 32 by a hydraulic cylinder (not shown). The pile P to be press-fitted is gripped by the fixed claw 32 and the movable claw 33 provided on the chuck body 27.

[0022] At the upper part of the chuck body 27, a guide surface 35 is formed in a funnel shape that widens upward. As will be described later, the lower end of the pile P suspended by a crane or the like is guided by this guide surface 35, so that the pile P can be smoothly passed through the opening 31 of the chuck body 27.

[0023] The upper part of the chuck frame 26 is provided with an arm member 40 disposed in the vicinity of the chuck 25. In the illustrated form, an arm member 40 is provided that is disposed from the side to the front of the chuck 25. This arm member 40 can be mounted on either the left or right side of the chuck 25, and FIGS. 1 to 7 show a form in which the arm member 40 is mounted on the right side of the chuck 25.

[0024] At the upper part of the chuck frame 26, a base frame 41 is fixed at a position behind the pile P passed through the chuck 25, and support frames 42 can be attached to both the left and right sides of this base frame 41. Note that FIGS. 1 to 7 show a form in which the arm member 40 is mounted on the right side of the chuck 25, and the support frame 42 is attached to the right side of the base frame 41.

[0025] The arm member 40 is rotatably supported with respect to the support frame 42 by a shaft 43 provided at the tip of the support frame 42. As shown in FIG. 1, the arm member 40 is arranged to incline upward toward the front, and in such a posture of inclining upward toward the front, the arm member 40 rotates in a substantially horizontal plane about the shaft 43.

[0026] An extension part 45 is provided on the arm member 40 on the opposite side across the shaft 43, and the tip of the piston rod 47 of a cylinder 46 provided on the base frame 41 is connected to this extension part. By the operation of this cylinder 46, the piston rod 47 is rotated about the shaft 43. When the piston rod 47 contracts and the extension part 45 is pulled backward, as shown in FIG. 2, the arm member 40 is moved to a position away from the chuck 25 toward the front. On the other hand, when the piston rod 47 extends and the extension part 45 is pushed forward, as shown in FIG. 3, the arm member 40 is moved to a position close to the chuck 25. Thus, the cylinder 46 has a function as a driving means for rotating the arm member 40 between a position away from the chuck 25 toward the front and a position close to the chuck 25.

[0027] As shown in Fig. 2, in a state where the arm member 40 is moved to a position away from the chuck 25 in a plan view, it has an arm base end portion 50 extending outward toward the front and an arm tip portion 51 extending inward toward the front. The arm base end portion 50 gradually extends outward from the shaft 43 toward the front, and the arm tip portion 51 gradually extends inward further toward the front in front of the arm base end portion 50. In this way, the arm member 40 has a shape that is curved like a bow as a whole with the center protruding outward in a state where it is moved to a position away from the chuck 25. In the form where the arm member 40 is attached to the right side of the chuck 25 as shown in the figure, the direction toward the center line L of the pile driver 1 is the inner side when viewed from the arm member 40 moved to a position away from the front.

[0028] And as shown in Fig. 3, in a state where the piston rod 47 extends and the arm member 40 is moved to a position close to the chuck 25, the arm base end portion 50 is located in front of the right side of the chuck 25, and the arm tip portion 51 is located in front of the left side of the chuck 25. Also, in a state where the arm member 40 is thus moved to a position close to the chuck 25, the center of the arm member 40 has a shape protruding forward. In this way, in a state where the arm member 40 is close to the chuck 25, the front of the chuck 25 can be surrounded from both the left and right sides by the arm member 40 having a shape that is curved like a bow as a whole.

[0029] A buffer member 52 is disposed inside between the arm base end portion 50 and the arm tip portion 51 constituting the arm member 40. The buffer member 52 is made of, for example, a sling, a rubber belt, a string, a rope, a wire, etc., and has flexibility. One end of the buffer member 52 is connected to the tip of the arm member 40 (the tip of the arm tip portion 51), and the other end of the buffer member 52 is connected to the support frame 42 at a position inside and behind the shaft 43.

[0030] Next, a method for supplying the pile P in the pile press 1 according to the embodiment of the present invention configured as described above will be described.

[0031] First, in the pile press 1, the movable claw 33 is separated from the fixed claw 32, and the chuck 25 is opened. Also, the piston rod 47 of the cylinder 46 is driven to shorten, and the arm member 40 is moved to a position forward from the chuck 25.

[0032] Then, a new pile P to be pressed into the ground is suspended by a crane or the like, brought close to the pile press 1, and moved inside the arm member 40 (the side where the buffer member 52 is arranged) as shown in FIG. 4. Since the arm member 40 is moved to a position forward from the chuck 25, the pile P can be carried in a wide range from directly above the chuck 25 forward. Since the new pile P carried into the pile press 1 in this way is in a suspended state, it may sway due to inertia or the influence of wind during transportation. However, by bringing it into contact with the buffer member 52 arranged inside the arm member 40, the swaying movement of the pile P can be stopped. Further, by bringing the pile P into contact with the buffer member 52, the impact is absorbed, and damage to the machine and generation of impact noise are avoided. Further, since the arm member 40 is arranged to be inclined upward toward the front, when bringing the pile P into contact with the buffer member 52, it is not necessary to lower the pile P suspended by a crane or the like more than necessary, and the work is easy.

[0033] Then, when the pile P is moved near the arm member 40 and brought into contact with the buffer member 52 in this way, as shown in FIG. 5, the buffer member 52 is pushed by the pile P, and a tension T is generated that tries to pull the tip of the arm member 40 (the tip of the arm tip portion 51) backward. By this tension T, the tip of the arm member 40 is pulled in the direction approaching the chuck 25, and the rotation of the entire arm member 40 inward can be started. In this way, by bringing the pile P into contact with the buffer member 52, the immediacy of starting the rotation of the arm is ensured.

[0034] Next, the piston rod 47 of the cylinder 46 as the driving means extends, and the arm member 40 is rotated in the direction approaching the chuck 25. Since the buffer member 52 can expand and contract to a certain extent and the arm member 40 has a curved shape, when the arm member 40 rotates in the direction approaching the chuck 25 in this way, as shown in FIG. 6, the pile P is held between the arm base end portion 50 and the arm tip portion 51. Thus, the pile P suspended by a crane or the like is gradually positioned inside the arm member 40.

[0035] Then, the piston rod 47 of the cylinder 46 further extends. As shown in FIG. 7, when the arm member 40 moves to a position close to the chuck 25, the arm base end portion 50 is located in front of the right side of the chuck 25, and the arm tip portion 51 is located in front of the left side of the chuck 25. Thus, the pile P suspended by a crane or the like is positioned above the chuck 25 by the curved arm member 40.

[0036] As shown in FIGS. 6 and 7, when the arm member 40 is rotated in the direction approaching the chuck 25 due to the extension of the piston rod 47, the buffer member 52 gradually loosens. Further, as the buffer member 52 extends, it becomes easier for the pile P to enter between the arm base end portion 50 and the arm tip portion 51. Thereby, the positioning of the pile P is smoothly performed. Also, as shown in FIG. 7, when the arm member 40 moves to a position close to the chuck 25, the completely loosened buffer member 52 holds the pile P so as to wrap it, suppressing the unintentional horizontal movement of the pile P due to the sway of the crane or the like, while enabling the intentional rotation and vertical movement of the pile P.

[0037] After the pile P is positioned above the chuck 25, the chuck 25 is raised to pass the pile P through the opening 31 of the chuck body 27. Alternatively, the pile P may be lowered by operating a crane or the like so as to pass the pile P through the opening 31 of the chuck body 27. Further, the raising of the chuck 25 and the lowering of the pile P may be performed simultaneously. In this case, the chuck body 27 of the chuck 25 may be appropriately rotated according to the orientation of the pile P that has moved directly above the chuck 25, and the orientation of the opening 31 may be appropriately adjusted. Note that the lower end of the pile P is guided by the funnel-shaped guide surface 35 formed at the upper portion of the chuck body 27, so that the pile P can be smoothly passed through the opening 31 of the chuck body 27.

[0038] Thus, after passing the pile P through the opening 31 of the chuck 25, the movable claw 33 is moved closer to the fixed claw 32 by a hydraulic cylinder (not shown), and the pile P is gripped by the chuck 25. Then, after the suspension by a crane or the like is released, in front of the leader mast 20, the chuck 25 is lowered along the lifting guide 21 by the shortening operation of the main cylinder 30, and the pile P gripped by the chuck 25 is pressed into the ground within the movable range of the main cylinder 30. Then, when the pile P is pressed into the ground within the movable range of the main cylinder 30, at the lower portion of the chuck body 27, the movable claw 33 is separated from the fixed claw 32 by a hydraulic cylinder (not shown), and the gripping of the pile P is once released. Then, by the extending operation of the main cylinder 30, the chuck 25 is raised along the lifting guide 21. And at the position where the chuck 25 has risen, at the lower portion of the chuck body 27, the movable claw 33 is moved closer to the fixed claw 32 by a hydraulic cylinder (not shown), and the pile P is gripped by the chuck 25 again. Thereafter, the same operation is repeated, and the pile P carried into the pile driver 1 is pressed into the ground to a predetermined depth. After the pile P is gripped by the chuck 25, by the shortening operation of the piston rod 47, the arm member 40 is rotated in a direction away from the chuck 25, and then prepared so that the next pile to be pressed can be received.

[0039] As described above, according to the pile driver 1 according to the embodiment of the present invention, when the pile P is carried into the pile driver 1, the pile P suspended by a crane or the like can be positioned above the chuck 25 by the arm member 40, and it is possible to carry in the pile P without requiring an operator, achieving labor saving. Also, since there is no need for the operator to approach the chuck 25, there is no risk of being pinched by the arm member 40 or the pile P, etc., which is safe. Also, there is no need to install a work scaffold. For this reason, safety, efficiency, labor cost, etc. can be greatly improved.

[0040] As described above, an example of the embodiment of the present invention has been described, but the present invention is not limited to such an example. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims, and it is naturally understood that those also belong to the technical scope of the present invention.

[0041] For example, in the above embodiment, the form in which the arm member 40 is attached to the right side of the chuck 25 is shown, but as shown in FIG. 8, the arm member 40 can also be attached to the left side of the chuck 25. In this case, for example, the base frame 41 is made symmetric left and right, and the support frame 42 and the arm member 40 are reversed so that they can be freely replaced on both the left and right sides of the chuck 25, thereby reducing the number of parts. For example, depending on various conditions such as the site situation and the wind direction, the arm member 40 can be arbitrarily replaced on the left and right sides of the chuck 25. Also, in addition to replacing the support frame 42 and the arm member 40 on the left and right of the base frame 41, a method of rotating the base frame 41 to change the left and right positions of the arm member 40 is also conceivable.

[0042] The base frame 41 may be attached not only to the upper part of the chuck frame 26 but also, for example, to the leader mast 20 or the main cylinder 30. It is preferable to arrange the arm member 40 to be inclined upward from the horizontal toward the front so that the pile P suspended by a crane or the like can be received at a position as high as possible. Although the form in which the arm member 40 is arranged to be inclined upward toward the front is shown, the arm member 40 may be arranged to be inclined downward from the horizontal in order to adapt to a so-called low-headroom site such as under the bridge girder. Further, as an example in which the center of the arm member 40 protrudes forward in a state where the arm member 40 is moved to a position close to the chuck 25, another embodiment is conceivable in which the arm member 40 itself is flexible and, in a state where the arm member 40 is close to the chuck 25, the center of the arm member 40 is curved so as to protrude forward due to the presence of the pile P held by the arm member 40.

[0043] In addition, in the above, as an example of the pile P, a U-shaped steel sheet pile is shown, but the present invention can also be applied to a pile press-in machine for press-fitting hat-shaped steel sheet piles, concrete sheet piles, steel pipe piles, steel pipe sheet piles, and the like.

[0044] Figs. 9 and 10 are plan views of a pile press-in machine 2 according to another embodiment of the present invention. This pile press-in machine 2 has an arm base end portion 61 where the arm member 60 extends outward toward the front and an arm tip portion 62 attached so as to extend inward from the arm base end portion 61. A pair of front and rear rolls 65 and 66 are attached to the arm base end portion 61, and an endless belt 67 as a buffer member is wound around the rolls 65 and 66. In addition, since other than the configuration of the arm member 60 is the same as that of the pile press-in machine 1 described above, in elements having substantially the same functional configuration, the same reference numerals are given and redundant description is omitted.

[0045] Also in the pile driver 2 shown in FIGS. 9 and 10, similarly to the pile driver 1 described above, by abutting against the endless belt 67 as a buffer member disposed inside the arm member 60 (arm base end portion 61), the pile P can be carried in. In this way, by abutting the pile P against the endless belt 67, impacts are absorbed, and damage to the machine and generation of impact noise are avoided. Then, by the extension operation of the piston rod 47, the arm member 60 is rotated in a direction approaching the chuck 25, so that the pile P can be held and positioned between the arm base end portion 61 and the arm tip portion 62. In addition, in the pile driver 2 shown in FIGS. 9 and 10, by rotating the rolls 65 and 66 to move the endless belt 67 circumferentially with the pile P abutted against the endless belt 67 according to the situation, the pile P can be moved above the chuck 25. Since the endless belt 67 of this pile driver 2 is always in a state where tension is acting without loosening, the pile P abutting against the endless belt 67 as the arm member 60 is rotated in a direction approaching the chuck 25 rolls on the endless belt 67 and is drawn toward the chuck 25, and finally can be positioned above the chuck 25. In this way, in this pile driver 2, the endless belt 67 functions as a moving mechanism for moving the pile P above the chuck 25. Therefore, this pile driver 2 is particularly suitable for piles having a substantially circular cross section such as steel pipe piles and steel sheet piles.

[0046] Also in FIGS. 1 to 8, in the state where the arm member 40 is moved to a position close to the chuck 25, a shape in which the center of the arm member 40 protrudes forward is shown, but it is not necessarily curved at the center portion of the arm member 40. For example, as in the form shown in FIGS. 9 and 10, a curved shape between the base end and the tip of the arm member 40 such that the arm tip portion 62 is shorter than the arm base end portion 61 may be sufficient.

Industrial Applicability

[0047] The present invention can be applied to a pile driver that performs pile driving construction for driving a pile into the ground and pile pulling construction for pulling a pile out of the ground.

Explanation of Reference Numerals

[0048] 1 and 2 Hydraulic Press Pile 10 Saddles 11 Clamps 12 Slide Frames 20 Leader Masts 21 Lifting Guides 25 Chucks 26 Chuck Frames 27 Chuck Bodies 30 Main Cylinders 31 Openings 32 Fixed Claws 33 Movable Claws 35 Guide Surfaces 40 Arm Members 41 Base Frames 42 Support Frames 43 Shafts 45 Extension Parts 46 Cylinders 47 Piston Rods 50 Arm Base End Parts 51 Arm Tip Parts 52 Buffer Members 60 Arm Members 61 Arm Base End Parts 62 Arm Tip Parts 65 and 66 Rolls 67 Endless Belts (Buffer Members)

Claims

1. A pile press-in machine for press-fitting a pile into the ground, comprising: an arm member disposed in the vicinity of a chuck that grips a pile to be press-fitted into the ground; driving means for rotating the arm member to a position away from the chuck in the forward direction and a position close to the chuck; The pile press-in machine, wherein the arm member has a curved shape protruding forward of the chuck so as to substantially coincide with the opening of the chuck in a state where the arm member has moved to a position close to the chuck.

2. The pile press-in machine according to claim 1, further comprising a buffer member disposed inside the arm member.

3. The pile press-in machine according to claim 1 or 2, wherein the arm member is inclined downward or upward from the base end portion of the arm to the tip end portion of the arm.

4. The pile press-in machine according to any one of claims 1 to 3, wherein the arm member is interchangeable between the left side and the right side of the chuck.

5. A method for supplying a pile to a pile press-in machine for press-fitting a pile into the ground, comprising: an arm member disposed in the vicinity of a chuck that grips a pile to be press-fitted into the ground; driving means for rotating the arm member to a position away from the chuck in the forward direction and a position close to the chuck; The arm member has a curved shape protruding forward of the chuck so as to substantially coincide with the opening of the chuck in a state where the arm member has moved to a position close to the chuck. A method for supplying a pile in a pile press-in machine, characterized in that after a pile is carried into the vicinity of the arm member in a state where the arm member is separated from the chuck in the forward direction, the arm member is rotated to a position close to the chuck.

6. having a buffer member located inside the arm member; The method for supplying a pile in a pile press-in machine according to claim 5, characterized in that the arm member is rotated in a direction close to the chuck by the pile carried into the vicinity of the arm member abutting against the buffer member and pushing the buffer member.

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