JPH0625415B2 - Pile pulling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the rebuilding of a building,
The present invention relates to a device for pulling out foundation piles and the like driven in at the time of construction.

[0002]

2. Description of the Related Art Conventional removal work of existing piles is carried out by attaching a casing to the lower end of the earth auger of a pile driver, excavating the casing while rotating the casing with a tool provided at the tip, and surrounding the pile. After excavating to the depth of the tip, pull up the casing. After that, attach a wire to the tip of the residual pile, wind up this wire, and pull out the pile. And finally, it consists of the step of introducing sand into the excavation hole after extraction by a mini excavator.

However, according to the conventional method, since the excavation of the casing and the pulling up of the piles are performed by another tool after the casing is pulled up, the efficiency is low, and further, in the case where the driven piles are multi-stage piles, the There is a drawback that the stake remains and it takes a lot of time to pull it out.

[0004] As a means for eliminating this drawback,
Japanese Patent Application Laid-Open No. 58-26119 describes a structure in which a pile holding mechanism is pressed inward by the resistance of earth and sand when the excavating casing is rotated in the direction opposite to that during excavation. However, the earth-and-sand resistance described in the publication may cause a shortage of the pressing force due to the earth-and-sand resistance and a shortage of the hugging force of the existing pile, resulting in a lack of work safety. From this point of view, as described in Japanese Patent Publication No. 61-19774, the method of operating the pile hugging mechanism attached to the casing from the outside of the casing is excellent in terms of work stability. .

However, the device disclosed in the above publication needs to be provided with a hydraulic medium passage and other accessory mechanisms in order to operate by the hydraulic mechanism, and it is necessary to increase the thickness of the casing for holding the pile.

Therefore, as in the case of urban redevelopment,
There is a problem that the actual application is impossible when targeting a narrow land where many existing piles exist. In particular, if the existing pile is a multi-tier pile, it cannot be handled at all.

[0007]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that the pile pull-out operation can be performed with a single device regardless of whether the residual pile is a single pile or a multi-stage pile, and even if the pile is pulled out in a narrow space. It is to provide a device that can perform

[0008]

SUMMARY OF THE INVENTION A pile extracting device of the present invention has an opening at a lower peripheral wall of a casing having an excavating blade at a lower end and a water discharge port opening toward the inside at the lower end. A multi-tiered pile-holding cam mechanism composed of an L-shaped cam that rotates in the up-down direction with the opening wall as an intersection, and for winding the wire attached to the outer end of the L-shaped cam at a position above the casing. And a cam rotation mechanism composed of a piece having a handle with a ratchet.

[0009]

[Operation] While rotating the casing in one direction while holding the existing pile in it, excavating the periphery of the pile with the digging blade at the tip of the casing, and grasping the pile enclosed in the casing from the outside. The cam is operated to strongly grip the existing pile, and when the casing is pulled up by this, the existing pile is pulled up together with the casing while being held in the casing.

Therefore, since a simple structure of the cam mechanism is provided in a plurality of stages on the outer circumference of the casing,
The digging diameter can be reduced without expanding the outer peripheral surface of the casing. Moreover, the pile can be mechanically and reliably pulled up. At this time, by providing the hugging mechanism over a plurality of stages, the existing piles divided into a plurality of parts can be simultaneously pulled up.

[0011]

FIG. 1 shows the appearance of an embodiment of the device of the present invention,
FIG. 2 shows a sectional structure.

3 and 4 show a hugging mechanism, FIG. 3 shows a mechanism of a gripping cam, and FIG. 4 shows an operating mechanism.

In these drawings, 1 is a casing for excavation, 2 is an excavating blade attached to the tip peripheral surface of the casing, and when the casing 1 is rotated in one direction, the existing pile shown by a dashed line in FIG. Drill the outside area. Reference numeral 3 denotes a water introducing passage for introducing water from the auger mounting portion 4 of the casing 1 at the time of excavation and ejecting water into the inside of the casing 1 from a water discharge port 5 which is opened inward at the lower end of the casing 1.

Further, the casing 1 is provided with a hugging cam mechanism 6 at a lower position thereof in a plurality of stages at two opposing outer peripheral surfaces of the casing. In the case shown, only one of the multi-stage hugging cam mechanisms is shown. As shown in FIG. 3, the hugging cam mechanism 6 is attached to an L-shaped cam 7 by a pulling wire 8 so as to rotate in a vertical direction about a fulcrum 9 provided in an opening of the casing 1. ing. The wire 8 for the L-shaped cam 7 is wound or unwound by operating a cam rotation mechanism 10 provided above the casing 1 shown in FIG. FIG. 4 shows details of the cam rotation mechanism 10 for this purpose. In the figure, 11 is a wire 8
Shows a piece for winding up the handle 12 with ratchet
When the wire 8 is pulled upward by rotating, the cam 7 rotates in the direction of the arrow as shown by the alternate long and short dash line in FIG.

Therefore, when pulling up the pile 13 held in the casing 1, it is possible to surely pull up without rotating the casing 1 in the reverse direction.

FIG. 5 shows an embodiment of a pile pulling-out method using the device of the present invention. As shown in FIG. 3A, the casing 1 is attached to the lower end of the sheath auger of the pile driving machine M, and the casing 1 is rotated in one direction by the excavating blade 2 as shown in FIGS. Excavate around.
As shown in (d), after reaching the tip of the pile P, (e)
As shown in FIG. 2, the handle 12 of the cam rotation mechanism 10 is rotated in the process of pulling up the casing, the pile P is gripped by the L-shaped cam, and the casing 1 is pulled up at the same time as the pile P is pulled up.
Also lift.

In this process, the pile holding cam mechanism 6
By providing the cams 7 that form the
As shown in the drawing, even if the upper pile and the lower pile are separated, it is possible to lift the multi-stage pile in one step without pulling only the upper pile.

[0018]

According to the present invention, the pile can be efficiently and safely pulled out regardless of the form of the driven pile, and the pile used in the old building, which has been a bottleneck in the land redevelopment, can be removed. Can be done easily and reliably, which can contribute to the improvement of the overall efficiency of redevelopment.

[Brief description of drawings]

1 shows the appearance of an embodiment of the device according to the invention.

FIG. 2 shows a cross-sectional structure of the device of the present invention.

FIG. 3 is a view showing a mechanism of a gripping cam.

FIG. 4 is a diagram showing an operating mechanism.

FIG. 5 shows a pile removing process using the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Excavation blade 3 Water introduction path 4 Auger mounting part 5 Water discharge port 6 Hugging cam mechanism 7 Cam 8 Lifting wire 9 Support point 10 Cam rotation mechanism 11 Piece 12 Handle with ratchet 13 Driving pile

Claims (1)

[Claims] 1. An opening is provided in a lower peripheral wall of a casing having an excavating blade at a lower end thereof and a water discharge port opening toward the inside at the lower end thereof, and the casing is pivoted up and down with the opening wall as a fulcrum. A cam swivel consisting of a plurality of stages of pile hugging cam mechanism composed of die-shaped cams, and a piece having a handle with a ratchet for winding the wire attached to the outer end of the L-shaped cam above the casing. Withdrawal device having a moving mechanism.