JP4712992B2 - Clamping mechanism and pile press-fitting machine using it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamping claw of a clamping mechanism or a chucking unit of a pile press-fitting / extracting machine, a working mechanism on other piles, and a pile drawing / pressing machine using the same.
[0002]
[Prior art]
A clamping mechanism such as a pile of a clamp part or a chuck part used in a work device on a pile such as a pile drawing press-fitting machine is composed of a movable claw and a fixed claw.
As shown in FIG. 7, the surface of the conventional movable claw 93 and the surface of the fixed claw 92 are not inclined and face each other in parallel.
When the pile 10 is held, the movable claw 93 moves forward, contacts the surface of the pile 10 and applies a pressing force F2 in the right direction in the figure. At this time, since the pile 10 is fixed in the ground and does not move, the movable claw 93 receives a reaction force from the pile 10 (see FIG. 8). If the movable claw 93 is continuously advanced in this state, the entire holding mechanism 91 rotates in the direction of arrow A, so that only the upper portion of the surface of the movable claw 93 is in contact with the surface of the pile 10. Thereafter, the surface of the fixed claw 92 comes into contact with the surface of the pile 10, and the pile 10 is held by the both holding claws 93 and 92.
This state is the state shown in FIG. 9, where the left side 91 a of the holding mechanism 91, that is, the portion where the movable claw 93 is installed is slightly opened, and the surface of the movable claw 93 is pressed diagonally against the surface of the pile 10. However, there is an opening angle α. The pinching mechanism is desirably small and lightweight in terms of the press-fitting work of the pile, and the weight has been reduced, but the opening angle α increases as the weight of the holding mechanism decreases, and the angle increases due to the decrease in rigidity. In the worst case, a gap may occur at the lower end.
[0003]
The case where this clamping mechanism is used for the chuck portion of the pile press-fitting and drawing machine will be described.
When the pile 10 is pulled upward in the above-described holding state, the holding force is insufficient, and the holding claws 93 and 92 are easy to slide, so that the drawing operation of the pile cannot be performed efficiently. Moreover, if this is repeated, only the upper part of the surface of the movable claw 93 is easily reduced.
Furthermore, when the pulling force of the clamping claws is increased, the portion of the upper portion of the pile 10 where the pressing force is large may be damaged and the pile may be cut.
[0004]
As shown in FIG. 10, when the pile 10 is press-fitted by a pile press-fitting / extracting machine equipped with a conventional clamping mechanism in the clamp portion, the driven pile 10 receives resistance from the soil, and therefore the pile press-fitting / extracting machine 1 is caused by the reaction force. Tilts up and floats up. Since the force is received by the clamp portion 3, a thrust force F3 is exerted on the clamp portion 3 so as to pull out from the existing pile 10a.
For this reason, in the conventional clamping mechanism, the clamping surface pressure balance is lost, and the surface of the clamping claw is likely to slip, and the pile press-fitting / pulling machine 1 may lose its posture and be out of order in the pressing-in direction. That is, the pile 10 is driven in the direction D2 inclined by the angle θ from the original press-fitting direction D1 of the pile 10 and the construction accuracy is lowered.
[0005]
[Problems to be solved by the invention]
As described above, since the surface of the movable claw 93 of the conventional clamping mechanism is in contact with the surface of the pile 10 at an angle, an opening angle α is generated between them. Therefore, the center P2 of the pressing force of the movable claw 93 is above the center of the movable claw 93, and the pressing force is not generated equally on the surface of the pile 10, and the upper portion of the holding claw 93 has a large pressing force and the lower portion has a pressing force. It is getting smaller.
[0006]
When the pile 10 is pulled upward in the above-mentioned holding state, the balance of the surface pressure is lost, and the biting area of the holding claws is reduced, so that the holding force is insufficient, and the holding claws 93 and 92 are easy to slide, and the pile pulling work is performed. It cannot be done efficiently. Moreover, if this is repeated, only the upper part of the surface of the movable claw 93 is easily reduced.
Furthermore, when the pulling force of the clamping claws is increased, the portion of the upper portion of the pile 10 where the pressing force is large may be damaged and the pile may be cut.
It is an object of the present invention to provide a gripping mechanism that can remove the drawbacks of the conventional gripping mechanism and can securely grip the gripped object.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the gist of the present invention is that in a clamping mechanism that clamps a pile or the like of a work device on a pile with a movable claw and a fixed claw, at least a movable claw or a fixed claw constituting the clamping mechanism One surface is inclined with respect to the surface of the sandwiched object, and the interval between both sandwiching claws is configured to gradually narrow downward.
[0008]
In addition, the present invention is characterized in that the above-described clamping mechanism is provided in a chuck portion that is provided in a pile press-fitting and drawing machine and presses or pulls out a pile.
Furthermore, the present invention is characterized in that the above clamping mechanism is provided in a clamp portion that is provided in a pile press-fitting and extracting machine and clamps an existing pile.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 illustrate an embodiment of the present invention. FIG. 1 is a front sectional view of a clamping mechanism, FIG. 2 is a front sectional view of a state in which a pile as a clamping object is clamped, and FIG. FIG. 4 and FIG. 4 are explanatory diagrams showing another example.
In FIG. 1, reference numeral 11 denotes a holding mechanism, 12 denotes a fixed claw, and 13 denotes a movable claw. The fixed claw 12 of this embodiment has a tapered surface. That is, the lower width L2 is larger than the upper width L1, and the surface is inclined by an angle β.
FIG. 2 is a front view showing a state where the pile 10 is held. In this case, the center P1 of the pressing force of the movable claw 13 is the same point as the center of the movable claw 13.
[0010]
The operation of this embodiment will be described. First, when the movable claw 13 moves forward and presses the pile 10 with the pressing force F1, the lower portion of the movable claw 13 is in contact with the surface of the pile 10 at the contact point P13 as shown in FIG. Since the surface 12a is a taper shape, it will be in the state which contacted the surface of the pile 10 in the contact point P12 of the lower part.
Thereafter, when the pressing force F1 of the movable claw 13 is further increased, the clamping mechanism 11 is supported at the contact points P12 and P13, and thus rotates in the arrow A direction. And when F1 becomes the maximum gripping force which becomes a predetermined gripping force and the surface 12a of the fixed claw 12 is in close contact with the pile 10, the surface 13a of the movable claw 13 is also in close contact with the pile 10, The pile 10 will be held by the entire surface of 13 and will be in the state of FIG.
[0011]
In the state where the pile 10 is sandwiched, the distance between the sandwiching claws 12 and 13 is substantially parallel, but the right side 11b of the sandwiching mechanism 11 is slightly opened, and a force that always presses the left side in the figure is applied. Therefore, the both clamping claws 12 and 13 always apply a pressing force to the pile 10 inward, that is, in a direction in which the clamping mechanism is closed.
[0012]
As described above, since both surfaces of the movable claw 12 and the fixed claw 13 are in average contact with the surface of the pile 10, the center P1 of the pressing force of the movable claw 13 is the same position as the center of the movable claw 13, The surface pressure with respect to the pile 10 at the time of clamping of both clamping claws becomes substantially constant.
When the pile 10 is pulled upward in the above-described holding state, the holding claws 13 and 12 do not slip and the pulling operation of the pile can be performed efficiently.
[0013]
What is shown in FIG. 4 is another example of the clamping claws.
In FIG. 4A, the surface of the fixed claw 22 is vertical, and a taper portion having an angle β is formed on the surface of the movable claw 23. According to this, the movable claw 23 comes into contact with the pile 10 and receives a reaction force, and the surface 23 a comes into close contact with the surface of the pile 10 in a state where the clamping mechanism is rotated.
[0014]
In the example of the clamping claw shown in FIG. 4B, the surface of the fixed claw 32 is vertical and does not form a taper portion, but is attached to the clamping mechanism with an angle β inclined.
According to this, there exists an effect similar to the fixed nail | claw 12 of the said embodiment.
[0015]
Next, the case where the said clamping mechanism is used for a pile press-fit drawing machine is demonstrated.
FIG. 5 shows an example in which the present clamping mechanism 11 is applied to the chuck portion 2.
The pile 10 in the ground is subjected to earth pressure, and soil is attached to the surface of the pile 10, and a large resistance force is applied at the time of drawing. Therefore, in the conventional clamping mechanism, troubles such as cutting of the pile occurred at the portion where the pressing force of the clamping portion at the upper end of the pile is high. However, according to this clamping mechanism 11, the large force of both clamping claws 12 and 13 Thus, since the pile 10 can be securely clamped, troubles due to the conventional example as described above are eliminated.
Further, there are no inconveniences such as the nail slipping from the pile or the nail being reduced.
[0016]
FIG. 6 shows an example in which the present clamping mechanism 11 is applied to the clamp unit 3.
The normal clamp part 3 is provided with two movable claws 12 and two fixed claws 13 as shown in the drawing. When the pile 10 is press-fitted, the driven pile 10 receives resistance from the soil, so that the pile press-fitting / pulling machine 1 is lifted by the reaction force. Therefore, a thrust force F3 acts on the clamp part 3. According to the present clamping mechanism 11, since the existing pile 10a can be reliably clamped with a large force by the both clamping claws 12 and 13, the above-mentioned problem due to the conventional example is solved, and the pile 10 is driven in the vertical direction D3. It is.
The same applies when the pile is pulled out.
[0017]
【The invention's effect】
As described above, according to the present invention, at least one surface of the movable claw or the fixed claw constituting the clamping mechanism is inclined with respect to the surface of the clamping object, and the interval between the both clamping claws is gradually narrowed downward. Since it comprised, the holding thing can be reliably held with sufficient clamping force. Therefore, even if this clamping mechanism is applied to the chuck portion or the clamp portion of the pile press-fitting / extracting machine, there is an effect that an accurate and efficient pile press-in / pull-out operation can be performed in a reliable holding state.
[Brief description of the drawings]
FIG. 1 is a front sectional view of an embodiment of the clamping mechanism of the present invention. FIG. 2 is a front sectional view of a state in which a pile is clamped by the clamping mechanism of the present invention. FIG. 4 is a front view showing another example of the clamping claw of the present invention. FIG. 5 is a front view showing an example in which the clamping mechanism of the present invention is applied to a chuck portion of a pile press-fitting and extracting machine. FIG. 7 is a front sectional view showing an example in which the clamping mechanism is applied to a clamp portion of a pile press-fitting and pulling machine. FIG. 7 is a front sectional view of a conventional clamping mechanism. Front sectional view for explaining the operation of the conventional clamping mechanism [FIG. 10] Front sectional view for explaining the operation of the conventional clamping mechanism [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile press-fit drawing machine 2 Chuck part 3 Clamp part 10 Pile 11 Clamping mechanism 12 Fixed claw 13 Movable claw

Claims (3)

In a clamping mechanism for clamping a pile such as a work device on a pile with a movable claw and a fixed claw, at least one surface of the movable claw or fixed claw constituting the clamping mechanism is inclined with respect to the surface of the sandwiched object, and both clamping claws A sandwiching mechanism characterized in that the gap is gradually narrowed downward. A pile press-in / pull-out machine in which the chucking mechanism according to claim 1 is provided at a chuck portion for press-fitting or pulling out a pile. A pile press-fitting / extracting machine in which the clamping mechanism according to claim 1 is provided in a clamp portion that clamps an existing pile.

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