JP2002285554A - Pinching mechanism for pile, etc., and pile press-fitting/ extracting machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart sufficient pinching force to pinching claws of a pinching mechanism, thereby to efficiently carry out press-fitting/extracting work of piles. SOLUTION: The pinching mechanism 11 for a pile-top operating apparatus or the like, functions to pinch the pile, etc., by means of a mobile claw 13 and a fixed claw 12. According to the pinching mechanism 11, a rotation preventing means 20 is attached to the mobile claw 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping claw of a pile press-in / pulling-out machine, a clamping claw of a clamping mechanism provided in other working devices on piles, and a pile-pulling / pulling-in machine using the same.

[0002]

2. Description of the Related Art A pinching mechanism for a pile or the like used for a working device on a pile such as a pile press-in / pull-out machine is composed of a movable claw and a fixed claw. As shown in FIG. 5, the conventional movable claws 93, 9
The surface of the fixed claw 92 and the surface of the fixed claw 92 are opposed to each other in parallel, and the movable claws 93 and 94 are usually constituted by two hydraulic cylinders. When the pile 10 is clamped, the movable claws 93, 94
Moves forward and contacts the surface of the pile 10 to apply a pressing force F2 rightward in the figure. At this time, since the pile 10 is fixed in the ground and does not move, the movable claws 93 and 94 receive a reaction force from the pile 10 (see FIG. 6). In this state, the movable claw 9
3 and 94, the entire holding mechanism 91 rotates in the direction of arrow A, so that only the upper portions of the surfaces of the movable claws 93 and 94 are in contact with the surface of the pile 10, and the center of the pressing force is the point. It becomes P2. After that, the surface of the fixed claw 92 comes into contact with the surface of the pile 10, and the pile 10 is
It is in a state of being sandwiched between 94 and 92. This is the state shown in FIG. 7, in which the left side 91a of the clamping mechanism 91, that is, the portion where the movable claws 93 and 94 are provided is slightly opened, and the surfaces of the movable claws 93 and 94 are inclined with the surface of the pile 10. And an opening angle α is generated. This opening angle α increases as the weight of the clamping mechanism decreases, due to a decrease in rigidity.
In the worst case, a gap may be formed at the lower end.

The operation of the movable claws 93 and 94 will be described with reference to FIGS. In the pressed state, the movable claw 9
3, 94 are inclined and are in contact with the surface of the pile 10,
The surface pressure of the upper portions 93a and 94a of the movable claws 93 and 94 is higher, and the surface pressure of the lower portions 93b and 94b is lower. When the press-fitting of the pile 10 is continued in this state, a moment M is generated in the clamp portion 3 in the direction of the arrow in FIG. Therefore, the upper movable claw 93 exerts a force to move backward D3, and at the same time, the movable claw 9
Since the upper part 93a having a high surface pressure of No. 3 is easy to slip, an arrow E
Rotate in the direction. The lower movable claw 94 acts to move forward D4, and at the same time, the upper portion 94a slides on the pile surface and rotates in the direction of arrow F. As a result, the holding mechanism 91 is inclined by the angle θ as shown in FIG. 9B.

The pile press-in / pull-out machine 1 is inclined rearward as shown in FIG. For this reason, the posture of the pile press-in / pull-out machine 1 is lost, and a deviation occurs in the press-fitting direction. That is, since the pile 10 is driven in the direction D2 inclined by the angle θ from the vertical direction D1 which is the original press-fitting direction of the pile 10, the construction accuracy is deteriorated, and the press-fitting is lost, and the press-fitting efficiency is reduced. . In some cases, as shown in FIG. 11B, the existing pile 10a may be lifted and a step may occur.

[0005]

As described above, in the conventional clamping mechanism 91, the surfaces of the movable claws 93 and 94 slide on the pile 10 during clamping, and a sufficient clamping force cannot be obtained. In addition, when the pile 10 is press-fitted by the pile press-in / pull-out machine 1 having the above-described clamping mechanism 91 in the clamp portion 3, the clamp portion 3 cannot obtain a sufficient supporting force. The press-in / pull-out machine 1 was lifted up leaning rearward, and could not accurately press-fit the pile. The present invention eliminates the drawbacks of the conventional clamping mechanism and provides a clamping mechanism capable of securely clamping a clamped object, and a pile press-in / pull-out machine equipped with the clamping mechanism in a clamp portion. Aim.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, the gist of the present invention is to fix a pile working device or the like to a pile or the like by holding the pile or the like between a movable claw and a fixed claw. In the pinching mechanism described above, a rotation preventing means is provided on a movable claw constituting the pinching mechanism. Further, the rotation preventing means is a key which is slidably fitted into a notch formed in a lower portion of the upper movable claw and an upper portion of the lower movable claw. Further, the above-mentioned rotation preventing means is provided in a notch formed in a side portion of the upper movable claw and a side portion of the lower movable claw,
Each key is slidably fitted.

Further, the present invention is characterized in that the above-mentioned holding mechanism is provided in a clamp portion provided below the pile press-in / pull-out machine for holding an existing pile.

[0008]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a front sectional view of a clamping mechanism.
2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional front view showing the second embodiment, and FIG. 4 is a sectional view taken along the line IV-IV of FIG.
In FIG. 1, reference numeral 11 denotes a clamping mechanism, 12 denotes a fixed claw, 1
Reference numerals 3 and 14 denote movable claws. Nipping mechanism 11 of the present embodiment
Is provided with rotation preventing means attached to the movable claws 13 and 14. That is, a notch 13a is formed at the lower rear of the upper movable claw 13 of the holding mechanism 11, and a notch 14a is formed at the upper rear of the lower movable claw 14.
The key 20 serving as a rotation preventing means is attached to the holding mechanism so as to be slidably fitted to the holding members a and 14a.

Next, the operation of the present embodiment will be described. First, the movable claws 13 and 14 move forward to press the pile 10, and the fixed claws 12 are pressed.
Comes into contact with the surface of the pile 10. When the stake 10 is pressed down by pushing down the chuck portion 2 in this state, as shown in FIG. 2, a moment M acts on the holding mechanism 11 in the left direction in the figure. At the same time, a rotational force acts on the upper movable claw 13 in the direction of arrow E, and a rotational force acts on the lower movable claw 14 in the direction of arrow F. However, since the rotation of the movable claws 13 and 14 is prevented by the key 20, the surfaces of the movable claws 13 and 14 do not slide on the pile 10, and the clamping mechanism 11 securely clamps the pile 10 without tilting. Can be. Therefore, the holding mechanism 1 of the present embodiment
1 is applied to the clamp portion 3, the two claws 13, 1
4, the existing pile 10a can be securely clamped, so that the above-described problem of the conventional example is solved, and the pile 10 is driven in the vertical direction D1. In addition, even when the pile is pulled out, the clamp portion 3 has the same operation and effect, and the pile press-in and pull-out machine 1 can be prevented from being inclined to perform an efficient pulling-out operation.

FIGS. 3 and 4 show a second embodiment of the present invention. In the present embodiment, notches 23a and 24a are formed on the side portions of the upper and lower movable claws 23 and 24, respectively, and keys as rotation preventing means are slidably fitted into the notches 23a and 24a. 25 and 26 are attached to the holding mechanism. At the time of press-fitting the stake 10, similarly to the above, a rotational force E acts on the upper movable claw 25 and a rotational force F acts on the lower movable claw 26. The rotation of each 26 is prevented, and the same effect as in the first embodiment is obtained.

[0011]

As described above, according to the present invention, since the rotation preventing means is provided on the movable claw constituting the holding mechanism, the held object can be reliably held with a sufficient holding force. Therefore, even if this clamping mechanism is applied to the clamp portion of the pile press-in / pull-out machine, effects such as accurate and efficient pile press-in / pull-out work can be achieved in a reliable clamping state.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a first embodiment of a holding mechanism of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front sectional view of a second embodiment of the holding mechanism of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a front sectional view of a conventional clamping mechanism.

FIG. 6 is a diagram illustrating the operation of a conventional clamping mechanism.

FIG. 7 is a diagram illustrating the operation of a conventional clamping mechanism.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a diagram illustrating the operation of a conventional clamping mechanism.

FIG. 10 is an explanatory view showing a pile press-in operation by a pile press-in / draw-out machine.

11A and 11B are explanatory diagrams showing a pile press-in / punching-out operation by a pile press-in / pull-out machine, wherein FIG. 11A shows a state in which the pile press-in / pull-out machine is inclined rearward, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile press-in / pull-out machine 2 Chuck part 3 Clamp part 10 Pile 11 Nipping mechanism 12 Fixed claw 13, 14, 25, 26 Movable claw 20, 25, 26 Key (rotation prevention means) 13a, 14a, 23a, 24a Notch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D050 AA12 CB22 DB03 EE04 EE12

Claims (4)

[Claims] In order to fix a working device on a stake, etc. to a stake or the like, in a holding mechanism for holding the stake or the like between a movable claw and a fixed claw, the movable claw constituting the holding mechanism is provided with rotation preventing means. Characteristic pinching mechanism for piles. 2. The key according to claim 1, wherein said rotation preventing means is a key which is slidably fitted into a lower portion of said upper movable claw and a notch formed in an upper portion of said lower movable claw. For holding piles. 3. The key according to claim 1, wherein the rotation preventing means is a key which is slidably fitted into a side portion of the upper movable claw and a notch formed in a side portion of the lower movable claw. A holding mechanism for the pile or the like according to claim 1. 4. A pile press-in / draw-out machine comprising a clamp for clamping an existing pile and the clamping mechanism for a pile or the like according to claim 1, 2 or 3.