JP2545342B2 - Clamping device for pile press-in / pull-out machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device which is attached to a pile press-in / pull-out machine and which obtains a reaction force when the pile is press-fitted into or extracted from the ground.

[0002]

A pile press-in / pull-out machine is used for press-fitting a new pile or pulling out a pile from a row of piles while moving on an existing pile. Such a pile press-in / pull-out machine performs press-in / pull-out of the pile by moving up and down while the chuck holds the pile, and secures reaction force at the press-in / pull-out of this pile to prevent its fall. Therefore, a clamp device that clamps the existing pile is provided.

FIG. 7 shows a state where a pile is clamped by a conventional clamp device. In the illustrated example, H steel is used as the pile 71, and a plurality of the piles 71 made of the H steel are press-fitted into the ground so as to be linearly arranged, whereby a linear pile row is constructed. The clamp device has a clamp main body 75 that hangs down from a pile press-fitting / extracting machine (not shown), and a clamp claw 76 attached to the clamp main body 75. The clamp claw 76 is a pile between a movable claw 76a that moves forward and backward in the pile direction by driving a fluid pressure cylinder (not shown) attached to the clamp body 75, and a movable claw 76a that is provided at a position facing the movable claw 76a. It is composed of a fixed claw 76b for holding 71.

In such a clamp device, the head of the existing pile 71 is clamped by the clamp claw 76 to obtain a reaction force at the time of press-fitting and pulling-out the pile. In the illustrated example, since the pile 71 is made of H steel and the central portion thereof cannot be sandwiched, each clamp body 75 is positioned so as to correspond to the boundary portion of the adjacent pile 71, and the heads of the adjacent piles 71 are simultaneously sandwiched. The reaction force is obtained by doing.

[0005]

The above-mentioned conventional clamping device can smoothly clamp a linear pile row, but a part of the pile row is bent or a circular pit is formed. In the case where the entire pile row is arcuate, the sandwiching of the pile rows adversely affects the piles. FIG. 8 shows a circular pit constructed by using H steel as the pile 71 and press-fitting the H steel so as to be arranged in an arc shape. Pile 71
Are arranged along the curvature of the circular pits, and the piles 71 adjacent to each other have a predetermined angle that matches the curvature of the circular pits. When the clamp claw of the clamp device clamps the boundary portion of the pile having such an angle, the clamp claw has a structure for clamping the linearly arranged pile, and therefore the head of the pile is indicated by the broken line 71a. Transform as shown. For this reason, there is a problem that the pile cannot be reliably clamped by the clamp claws and the construction accuracy of the newly press-fitted pile is lowered.

The present invention has been made in consideration of the above circumstances, and provides a clamp device capable of reliably clamping an existing pile without deforming the existing pile even for a pile row having a predetermined curvature. The purpose is to provide.

[0007]

In order to achieve the above object, the clamp device of the present invention has a clamp claw provided on a clamp main body for clamping an existing pile in a pile row to thereby reduce the pressure at the time of press-fitting or pulling-out the pile. In the clamp device of the pile press-fitting / extracting machine to be obtained, a pressing surface having a shape corresponding to the curvature of the pile row to be constructed is formed on the clamp claw, and the clamp claw is detachably attached to the clamp body. Clamp device.

[0008]

The clamp pawls of this clamp device are formed such that their pressing surfaces are shaped to match the curvature of the pile row to be constructed. That is, the pressing surface of the clamp claw corresponds to the angle of the piles to be constructed along the pile row. Therefore, the existing pile can be reliably and uniformly clamped, and the existing pile is not deformed.

[0009]

1 to 5 show an embodiment of the present invention.
FIG. 1 shows the entire pile press-fitting / pulling machine to which the present embodiment is applied, and includes a plurality of clamping devices 1 for sandwiching the existing piles 20 arranged side by side, and a chuck 2 for press-fitting new piles 21.

The clamp 1 hangs from the saddle 3,
A slide base 4 is mounted on the saddle 3 so as to relatively move in the pile row direction at least one pitch of the existing piles 20. A mast 5 is erected on the slide base 4, and a guide rail 6 is provided on the front side of the mast 5.
Are provided in the vertical direction. The elevating body 7 can be moved up and down along the guide rails 6, and the chuck 2 is attached to the elevating body 7. Such lifting body 7
Is moved up and down by the main cylinder 8 driven by fluid pressure, and a new pile 21 is press-fitted by lowering the lifting body 7. When the chuck 2 holds the pile and the lifting / lowering body 7 rises, the pile can be pulled out.
The clamp device 1 obtains a reaction force at the time of press-fitting or pulling-out the pile by moving the chuck 2 up and down, and therefore holds the existing pile 20.

2 and 3 show a clamp device 1 of this embodiment. In this embodiment, both the existing pile 20 and the new pile 21 are made of H steel (see FIGS. 4 and 5). The clamp device 1 includes a clamp body 10 that is attached so as to hang down from the saddle 3, and a clamp claw 11 that is attached to the clamp main rest 10. The clamp body 10 has a slit 12 into which the existing pile 20 is inserted by opening the lower end portion.

The clamp claws 11 are movable claws 1 facing each other.
1a and fixed claw 11b, these claws 11a,
11b is provided so as to be located in the slit 12. The movable claw 11 a is attached to the tip of a clamp cylinder 13 which is a fluid pressure cylinder attached to the clamp body 10. On the other hand, the fixed claw 11b is attached to the clamp body 10 so as to face the movable claw 11a. These movable claw 11a and fixed claw 11b
Is detachably attached to the clamp body 10. The movable claw 11a is fixed to the tip of the clamp cylinder 13 by laterally screwing a fastener 14 such as a bolt, and the fixed claw 11b. It is attached by screwing a similar fastener 15 from the back side of the clamp body 10. Therefore, by releasing the fastening of the fasteners 14 and 15, the movable claw 11a and the fixed claw 11b can be removed and replaced.

The movable claws 11a and the fixed claws 11b have pressing surfaces 16 and 1 whose surfaces facing the existing piles 20 press the existing piles 20.
7, the pressing surfaces 16 and 17 are formed in a shape that matches the curvature of the pile row. In the illustrated example, the pile row is constructed to construct a circular pit, and the piles 20 made of H steel are arranged on the circumferential line of the circular pit. In FIG. 4, reference numeral 25 denotes the circumferential line of this pile row. Since all the piles 20 are press-fitted along this circumference line 25,
Adjacent piles 20 are arranged not at a straight line but at a predetermined angle A. Pressing surface 1 of movable claw 11a and fixed claw 11b
Reference numerals 6 and 17 simultaneously press two adjacent piles 20 having the angle A as described above, and the respective pressing surfaces 16 and 17 are bent at the angle A as shown in FIG. To be molded. In this case, the pressing surface 16 of the movable claw 11a is a convex surface having an angle A, and the fixed claw 11b
The pressing surface 17 of is a concave surface having an angle A, which is determined by the holding direction of these claws 11a and 11b with respect to the pile 20, and when the holding direction is opposite, this is the opposite. .

As described above, the movable claw 11a and the fixed claw 11b
By molding the pressing surfaces 16 and 17 in accordance with the angle of the adjacent piles 20, the pressing surfaces 16 and 17 have a shape matched to the curve of the pile row. FIG. 5 shows a case where a plurality of clamp devices 1 having the clamp claws 11 configured as described above are arranged in a pile press-fitting / pulling machine. The pile row in FIG. 5 is for constructing a circular pit, and the clamp claws 11 of each clamp device 1 simultaneously clamp two adjacent piles 20 at an angle, but the movable claw 11a and the fixed claw 11b are included. Since the pressing surfaces 16 and 17 are molded to match this angle, the heads of the piles 20 are securely held. For this reason, the head of the pile 20 is not deformed, and the pile can be stably sandwiched, and the construction accuracy of the newly press-fitted pile is improved.

FIG. 6 shows another embodiment of the present invention, in which 41 is a curvature line of the pile row. In this embodiment, the steel sheet piles 30 are arranged along the curvature line 41 of the pile row. The steel sheet pile 30 includes a central web 31 and flanges 32 on both sides of the web 31.
And the grip 33 at the end of the flange 32 are connected to each other, and the steel sheet pile 3 is adjacent to the grip 33.
The steel sheet piles 30 are connected to each other by fitting with the grip 33 of 0. Since these steel sheet piles 30 are press-fitted along the curvature line 41, they are not arranged in a straight line, and the webs 31 thereof are in an oblique state between the adjacent steel sheet piles 30.
The clamp device 1 of the pile press-in / pull-out machine clamps the web 31 of the steel sheet pile 30, and by forming the movable claw 11a and the fixed claw 11b of the clamp claw 11 of each clamp device 1 according to this oblique angle. , The web 31 of the steel sheet pile 30 is securely clamped. This prevents the head of the steel sheet pile 30 from being deformed. Although the above embodiments have shown application to pile rows of circular pits, the present invention is not limited to this, and may be similarly applied to connected corrugated pile rows and pile rows having corner portions. You can

[0016]

According to the present invention, since the pressing surface of the clamp claw is formed into a shape that matches the curvature of the pile row, the pile can be reliably clamped even if it is a bent pile row. Therefore, a stable reaction force can be obtained without deforming the pile due to the sandwiching, and the pile press-fitting construction accuracy is also improved.

[Brief description of drawings]

[Fig.1] Overall side view of pile press-in / pull-out machine

FIG. 2 is a front view of an embodiment of the present invention.

FIG. 3 is a plan view of an embodiment of the present invention.

FIG. 4 is a plan view showing a sandwiched state.

FIG. 5 is a plan view showing the action on the constructed pile row.

FIG. 6 is a plan view showing the operation of another embodiment.

FIG. 7 is a plan view showing a clamped state of a conventional clamp device.

FIG. 8 is a plan view for explaining the deformation of the pile head.

[Explanation of symbols]

 1 Clamping device 10 Clamp body 11 Clamp claw 11a Movable claw 11b Fixed claw 16, 17 Pressing surface 20 Pile

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A clamp device for a pile press-in / pull-out machine, in which a clamp claw provided in a clamp body holds an existing pile in a pile row to obtain a pressure during press-fitting or pulling-out of the pile, according to the curvature of the pile row to be constructed. A clamping device, wherein a pressing surface having a curved shape is formed on the clamp claw, and the clamp claw is detachably attached to the clamp body.