JPH0681344A - Pliers for foundation pile - Google Patents

Abstract

PURPOSE:To safely and efficiently perform the connecting and releasing works of pliers to a pile top by remote control. CONSTITUTION:A pair of hangers 10, 10 clamping a rod-like body 3 protruded and fixed from a pile top 1 are pivotally fitted to a pliers main body freely opened or closed at the lower end. A pair of hangers 10, 10 are closed and fixed by the wedge action of a wedge 14 vertically moved by oil pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yatco, which is used for driving a foundation pile into the ground so as to drive the tip of the foundation pile to the supporting ground by connecting to the pile head. For Yatco that is detachable.

[0002]

2. Description of the Related Art In FIGS. 5 and 6, reference numeral 1 designates a yatco, which is a cap 2 attached to a lower end thereof, a yatco main body 3 having a smaller diameter continuously provided on an upper end of the cap 2 and an upper end of the yatco main body 3. It is composed of a mounting flange 4 provided and a plurality of long bolts 5 loosely inserted in the bolt insertion holes formed in the cap 2.

Then, this yatco 1 is attached to the head 6 of the foundation pile.
When connecting with, the cap 2 is covered on the pile head 6 and a plurality of female screw holes 8 formed in the end plate 7 thereof are used,
The tips of the bolts 5 are screwed into the female screw holes 8 and tightened to fix the bolts 5. Next, after driving the foundation piles to the support ground through the yatco 1, the yatco 1 is buried in the pile head 6 until it is fixed, or each of the bolts 5 is rotated in the reverse direction so that the female screw hole 8 is formed. Unscrew it, remove the Yatco 1 from the pile head 6, and pull it out.

[0004]

However, it is difficult and dangerous to screw or unfasten a plurality of long bolts 5 manually, and it is time-consuming and inefficient. Further, there is a problem that it is uneconomical to bury the Yatco 1 while fixing it to the pile head 6.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and remotely mounts and removes the yatco to and from the pile head of the foundation pile. The purpose is to provide something that can be carried out safely and in a short time.
When a pair of hangers for sandwiching a stick-shaped body protruding from the outer periphery of the pile head are pivotally attached to the Yatco body so that the lower ends of the hangers can be opened and closed, the pair of hangers move up and down by hydraulic pressure or the like. There is a yatco for a foundation pile, which is configured to be closed and fixed by a wedge action.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 is a front view in which a part of the yatco according to the present invention is cut out, FIG. 2 is a longitudinal sectional view of a main part of the yatco, FIG. 3 is an operation explanatory view of the yatco, and FIG. 4 is a basis using the yatco. It is a perspective view of the head of a pile.

In the figure, 1 is a pile head of a foundation pile, and a plurality of (four in the drawing) short rods 3 are radially fixed at predetermined intervals to an end plate 2 of each foundation rod. The tips 3A of 3 respectively project from the outer periphery of the pile. The means for fixing the round bar 3 is, as described above, a method of directly welding to the end plate 2,
The round bar 3 is welded to a ring plate (not shown) having the same diameter as the end plate 2, and this ring plate is formed in the female screw hole (not shown) formed in the end plate 2 by using this female screw hole. There is a method of screwing, and any of them may be used.

Reference numeral 4 designates a yatco, which has a cap 5 fitted on the pile head 1 at a lower portion thereof, and a holding portion 6 arranged on the outer periphery at a position corresponding to the round bar 3 fixed to the end plate 2. . The holding portion 6 is embedded in the outer periphery of the yatco 4 and is mounted in a rectangular case 7 having an opening at the bottom, and the outside of the case 7 is covered with a cover 8.

Reference numeral 9 designates a bearing portion. A pair of left and right hangers 10, 10 are rotatably pivoted to the bearing portion 9 by a pivot 11 in an intersecting state.
On the opposite surface of 0, concave portions 12A, 1 for holding the round bar 3 which is fixed to the pile head 1 and becomes a long hole 12 when closed.
Although 2A is formed respectively, an introduction port 13 for facilitating the insertion of the round bar 3 is formed in the lower part of both opposing surfaces by the triangular corners. Further, on the outer side surfaces of both hangers 10, 10 when closed, an upper half portion thereof is formed by an inclined surface 10A that expands outward from the bearing portion 9 downward, and further from the lower end portion of the inclined surface 10A. A portion reaching the lower end is formed by a vertical surface 10B, and a wedge 14 is vertically movable in a gap between the left and right parallel surfaces 10B and the side plate 7A of the case 7.

Reference numeral 15 denotes a support plate disposed immediately above the bearing portion 9, which is fixed to a pin 17 that moves in a box 16 fixed to the case 7 and is arranged so as to be able to move up and down. The left and right end portions 15A, 15A of 15 and the wedges 14, 14 are connected by tie rods 18, respectively, and the center of the upper portion of the support plate 15 is fixed to the upper portion of the case 7 by a hydraulic cylinder 19 or the like. It is connected to the rod. Reference numeral 20 in the drawing denotes a guide long groove opened in the cover 8, and the pin 17 slides along the guide long groove 20.

Therefore, the pile head 1 of the foundation pile sunk in the ground
To connect Yatco 4 to, first, as shown in Fig. 3,
By operating the cylinder 19 to raise the support plate 15 from the state shown by the chain line to the state shown by the solid line, the support plate 1
Tie rods 18, 18 on both left and right end portions 15A, 15A of 5
The wedges 14 and 14 connected via the above are respectively raised. As a result, the wedge 14 functioning as a wedge comes out in the gap between the vertical surface 10B of the pair of hangers 10, 10 and the side plate 7A of the case 7, so that the pair of hangers 10, 10 are centered on the pivot 11, respectively. It is free to move outward. Next, the cap 5 is lowered and fitted onto the pile head 1 while the round bars 3 fixed to the pile head 1 and the inlets 13 of the hangers 10, 10 are aligned with each other.

Then, the introduction port 13 descends and the round bar 3
Therefore, the hangers 10 and 10 receive a reaction force in the outward direction, respectively, and the hangers 10 and 10 open in the left-right direction around the pivot 11 as shown by the solid line in FIG. The round bar 3 is inserted into. Then, after the round bar 3 is inserted into the recess 12A from the introduction port 13, the cylinder 1
9 is operated in the reverse direction to lower the support plate 14, and the wedge 1
If 4 is made to penetrate along the parallel surface 10B from the inclined surface 10A in the gap between the side plate 7A of the case 7 and the outer surface of both hangers 10, both wedges 10 and 10 are drawn by the wedge action of the lowered wedge 14. It is fixed in the closed state as shown by the chain line in 3. As a result, the round bar 3 is sandwiched in the elongated hole 12, and the pile head 1 and the yatco 4 are coaxially connected. In this state, the upper end of the yatco 4 is tapped or pressed to form the foundation pile. Drive to the support ground.

Next, when the yatco 4 is to be removed from the pile head 1 of the foundation pile, the cylinder 19 is operated to raise the support plate 15 in the same manner as described above, and the wedge 14 connected to the support plate 15 is also lifted. Since the two hangers 10 and 10 are moved upward, the hangers 10 and 10 are free to move outwardly about the pivot 11, so if the yatco 4 is pulled up in this state, the round bar 3
Collide with the lower end 12B of the long hole 12, and the two hangers 10, 10 that have become free to move due to the reaction force thereof move outwardly so that the round bar 3 comes out of the inlet 13, and the pile head 1 and both hangers. Since the connection with 10, 10 is released, only the Yatco 4 can be pulled out.

[0014]

As described above, the yatco for a foundation pile according to the present invention is provided with a pair of hangers for sandwiching a stick-like body projecting from the outer periphery of the pile head and holding the pair of hangers so that the lower end of the hanger can be opened and closed. When they are put on, the pair of hangers are closed and fixed by the wedge action of the wedges that move up and down by hydraulic pressure etc., so it is safe to remotely attach and remove the Yatco to the pile head of the foundation pile. In addition, it can be performed in a short time, and it is economical because it can be used repeatedly.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a yatco for a foundation pile according to the present invention is cut away.

FIG. 2 is a vertical cross-sectional view of the essential parts of the same yatco.

FIG. 3 is a diagram for explaining the operation of the same yatco.

FIG. 4 is a perspective view of a pile head used for the same yatco.

FIG. 5 is a front view of a conventional semi-cut yatco for foundation piles.

FIG. 6 is a plan view of the same yatco.

[Explanation of symbols]

 1 Pile head 2 End plate 3 Round bar 3A Tip 4 Yatco 5 Cap 6 Clamping part 7 Case 8 Cover 9 Bearing part 10 Hanger 10A Sloping surface 10B Vertical surface 11 Axis 12 Long hole 12A Recess 12B Lower end 13 Inlet port 14 Wedge 15 Support plate 15A Both ends 16 Box 17 Pin 18 Tie rod 19 Cylinder 20 Guide long groove

Claims (1)

[Claims] 1. A pair of hangers for sandwiching a rod-shaped body protruding and fixed from the outer periphery of a pile head are pivotally attached to the Yatco body so that the lower ends of the hangers can be opened and closed. A yatco for a foundation pile, which is constructed so as to be closed and fixed by the wedge action of a vertically moving wedge.