JPH076190Y2 - Auxiliary weight - Google Patents

Description

[Detailed Description of the Invention] (Industrial application field) The present invention facilitates the press-fitting of a steel pipe pile, a steel pipe sheet pile, etc. into the ground when the steel pipe pile, the steel pipe sheet pile, etc. are pressed into the ground. About the auxiliary weight to do.

(Prior Art) When a pile such as a steel pipe pile or a steel pipe sheet pile is press-fitted into the ground, a pile press-fitting / extracting machine is used. At the time of initial press-fitting, the pile press-in / extractor was placed on a reaction force stand, and the pile of the press-in / pull-out machine was clamped and lowered to press the pile into the ground.

The reaction force when press-fitting these piles is determined by the weight of the press-fitting / pulling machine and the weight of the reaction force base. However, if the ground is hard or the press-fitting pile is long, the weight may be insufficient with only the press-fitting and extracting machine and the reaction base during the initial press-fitting, and it may take time to press-fit or the press-fitting may not be possible. . In particular, when press-fitting a steel pipe or a steel pipe sheet pile, a larger press-fitting force is required as the pipe diameter increases.

Therefore, when a large pressure input is required, an auxiliary weight is placed on the reaction force stand or the press-fitting pile to increase the reaction force.

(Problems to be solved by the invention) However, since the auxiliary weight is a bulky and heavy object, a great deal of time and effort is required to place it on the reaction force stand or the press-fit pile. Also, if it is attached to the upper end of the press-fitting pile or the reaction stand, the position of the center of gravity during work becomes high, which is dangerous.

(Means for Solving the Problem) In order to solve the above problem, the auxiliary weight of the present invention comprises a gripping mechanism in which a movable claw is attached to the side surface of a fixed claw so that the weight can be vertically inserted into a steel pipe pile. An elevating mechanism configured to make a pair and in which the weight moves up and down the inner surface of the steel pipe pile is provided between the pair of weights.

(Operation) The auxiliary weight is inserted into the pile, and the pile is gripped from the inside by the fixed claw and the movable claw of the lower gripping mechanism of the pair. Next, operate the lifting mechanism to raise the upper gripping mechanism,
The movable claw is extended to grip the pile together with the fixed claw.
Next, the movable claw of the lower gripping mechanism is retracted, and the elevating mechanism is reactivated to raise the lower gripping mechanism.

The position of the auxiliary weight does not change if the above operation is repeated in conjunction with the underground press-fitting of the pile and the auxiliary weight is raised as the pile descends.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 are operation explanatory views of the present embodiment mounted in a steel pipe pile, and FIGS. 4 and 5 are use explanatory views of the present embodiment.

The present embodiment is an auxiliary weight 1 for a steel pipe pile. As shown in FIGS. 1 to 3, a gripping mechanism 2 and a gripping mechanism 5 are provided on the upper and lower sides, and a cylinder mechanism 8 is formed between the gripping mechanism 2 and the gripping mechanism 5.

The gripping mechanism 2 includes a fixed claw 3 and a movable claw 4 having appropriate weights.
And the movable claw 4 is fixed by the action of the cylinder mechanism 2a.
It extends further and presses the inner peripheral surface of the steel pipe pile P with both pawls to fix the auxiliary weight 1 in the steel pipe pile P. The gripping mechanism 5 has the same structure as the gripping mechanism 2.

The cylinder mechanism 8 is provided between the gripping mechanism 2 and the gripping mechanism 5 and is a means for vertically moving both mechanisms. In the figure, H is a reaction force stand.

Based on the above configuration, the operation of this embodiment mounted on the steel pipe pile will be described.

As shown in FIG. 1, the auxiliary weight 1 of this embodiment is inserted into the steel pipe pile P, and the cylinder mechanism 2a of the gripping mechanism 2 is operated to press the steel pipe pile P from inside the pipe with the fixed pawl 3 and the movable pawl 4. Grasp and fix the auxiliary weight 1. At this time, the upper gripping mechanism 5 does not grip the steel pipe pile P.

Next, the cylinder mechanism 8 is operated to raise the gripping mechanism 5. After moving up, the movable claw 7 is extended to grip the steel pipe pile P together with the fixed claw 6 as shown in FIG.

After the auxiliary weight 1 is fixed by the upper gripping mechanism 5, the movable claw 4 of the lower gripping mechanism 2 is retracted to release the gripping state and the elevating mechanism 8 is operated to raise the gripping mechanism 2 (see FIG. 3).

By repeating the above operation, the auxiliary weight 1 rises in the steel pipe pile P.

As shown in FIG. 4, when the stroke rising speed of the auxiliary weight 1 (direction of arrow A in the figure) and the press-fitting stroke speed of the pile by the pile press-in / pull-out machine 10 (direction of arrow B in the figure) are matched, the auxiliary weight 1 becomes It is always in a fixed position with respect to the ground.

In particular, by electrically interlocking the auxiliary weight 1 and the pile press-fitting / pulling machine 10, the auxiliary weight 1 is automatically raised so that it can always maintain a fixed position.

As described above, when the piles are press-fitted using this embodiment, the weight of the auxiliary weight 1 is added as the press-fitting force of the pile press-fitting / pulling machine 10, so that the piles can be easily loaded even on the hard ground. It can be pressed in. The pull-out force of the existing press-fitting pile due to the reaction force generated when a new pile is press-fitted is reduced, and since the press-fitting force corresponding to the weight of the auxiliary weight 1 may be small, an unreasonable force is generated in the pile press-fitting and pulling machine 10. Absent.

Furthermore, since the position of the center of gravity is constant, the posture of the pile press-in / pull-out machine 10 is improved, and the steel pipe pile is less likely to fall.

Next, a process of moving the auxiliary weight 1 of this embodiment from the press-fitting completed pile to a new press-fitting pile will be described.

As shown in FIG. 5, a new steel pipe pile P2 is gripped by the chuck C. A new steel pipe pile P2 is placed directly above the existing steel pipe pile P1 in which the auxiliary weight 1 is fixed, and the steel pipe pile P1 and the steel pipe pile are arranged.
Match the diameter position of P2. After that, as described above, the gripping mechanisms 2 and 5 alternately grip the steel pipe piles P1 and P2, and the lifting mechanism 8
To raise the auxiliary weight 1.

As a result, the auxiliary weight 1 in the steel pipe pile P1 (phantom line in FIG. 5) moves into the steel pipe pile P2.

After that, the upper part of the pile press-in / pull-out machine 10 is moved forward and chuck C
Is lowered and a new pile P2 is pressed into the ground.

In this embodiment, since it is possible to move the existing steel pipe pile to the new press-fitting steel pipe pile by itself, it is not necessary to use a lifting device such as a crane at the time of movement.

In addition, although this embodiment was used for the steel pipe pile, the same action and effect can be obtained with the steel pipe sheet pile. Furthermore, the use of this embodiment is not limited to the initial press-fitting, but can be used for normal press-fitting.

(Effect of the Invention) As described above, the auxiliary weight of the present invention is mounted inside a steel pipe pile or a steel pipe sheet pile, and ascends in conjunction with the press-fitting speed to always maintain a low position close to the ground, which is safe. Moreover, since it is possible to move from pile to pile by itself, a lifting device is unnecessary. Further, the press-fitting time can be shortened and the piles can be easily press-fitted even on hard ground.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIGS. 1 to 3 are operation explanatory views, and FIGS. 4 and 5 are operation explanatory views. 1 ... Auxiliary weight, 2, 5 ... Gripping mechanism 3, 6 ... Fixed claw, 4, 7 ... Movable claw 8 ... Cylinder mechanism, P ... Pile

Claims (1)

[Scope of utility model registration request] 1. An elevating mechanism comprising a pair of upper and lower weights to be inserted into a steel pipe pile, which comprises a gripping mechanism in which a movable pawl is attached to a side surface of a fixed pawl so that the movable pawl can extend and contract, and the weights move up and down the inner surface of the steel pipe pile. An auxiliary weight that is provided between a pair of weights.