JPH0610350A - Device for extracting steel pipe pile - Google Patents

Abstract

PURPOSE:To rapidly and safely pull out a pile without vibrations and noises, and further, without deformation and breakage of the pile. CONSTITUTION:An attaching shaft 3 projected to the pulling-out direction is fitted at the front end of a cylindrical body 2 at which a jack 12 is jointed and a metal fixture 4 is fitted on the attaching shaft 3 to be movable in the pulling-out direction. A grasping claw 5 is attached to the lower end of the attaching shaft 3 so that the grasping face 5a at time front end thereof can move reciprocally against the inner face of the steel pipe pile P. The front end of grasping claw 5 is connected to the metal fixture 4 through a connection link 6. When the cylindrical body 2 is raised by the jack 12, the grasping face 5a of claw 5 presses the inner face of the steel pipe pile P and holds the upper end of the pipe. And the steel pipe pile P connected to the cylindrical body 2 as a unit is pulled out by the jack 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing device for steel pipe piles used for sheet piles.

[0002]

2. Description of the Related Art A sheet pile that has been driven into the ground before construction for the purpose of retaining soil or water is pulled out after construction, but in the past, a vibro hammer of a pile driver was used, and a steel pipe was used by the chuck of this vibro hammer. Either the upper end of a pile or the like was directly grasped, or an iron plate was welded to the upper end of a steel pipe pile or the like, and this was grasped and pulled out.

[0003]

However, in the conventional drawing method using the vibro hammer as described above,
Since the pile is vibrated through the chuck and the gripping area of the chuck is small, the pile may be deformed or cut. Further, there is a problem that the use place is limited due to vibration and noise of the vibro hammer. The present invention has been made to solve the above-mentioned problems, and an object thereof is to be able to pull out without deforming or cutting a pile, and to pull out quickly and safely without vibration and noise. An object of the present invention is to provide a pulling device for steel pipe piles, etc.

[0004]

According to the present invention, at the lower end of a columnar main body to which a jack is connected, a mounting shaft projecting in the pulling-out direction is provided, and a connecting metal fitting is provided on the mounting shaft so as to be movable in the pulling-out direction. A gripping claw is attached to the lower end of the mounting shaft, and a tip gripping surface of the mounting shaft is axially attached to the inner surface of the steel pipe pile so that the gripping claw can advance and retreat. The tip end of the gripping claw and the connection fitting are connected via a connecting link. .

[0005]

[Operation] When pulling out the steel pipe pile, if the connecting metal fitting is placed on the upper end of the steel pipe pile and the columnar main body is raised by the jack,
The shaft mounting base of the gripping claw rises through the mounting shaft, the tip of the gripping claw is pushed out toward the inner surface of the steel pipe pile by the connecting link, and the gripping surface of the gripping claw is pressed against the inner surface of the steel pipe pile.
The upper end of the steel pipe pile is gripped by the gripping claws, and the columnar body and the steel pipe pile are integrated. If the columnar body is raised by a jack, the steel pipe pile can be easily pulled out. When the columnar body is lowered with respect to the steel pipe pile by the jack, the gripping claws are separated from the inner surface of the steel pipe pile through the connecting link due to the lowering of the mounting shaft, and the pulling device can be easily detached from the upper end of the steel pipe pile. You can

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. This is an example applied to the drawing of a steel pipe sheet pile.
As shown in FIGS. 1 to 4, the drawing device 1 of the present invention is
A chuck is attached to the tip of the Yatco that is added to the steel pipe pile P. Mainly a columnar body (Yatco) 2,
It is composed of a mounting shaft 3, a connecting fitting 4, a grip claw 5, and a connecting link 6.

The columnar main body 2 is a cylindrical tubular body, is provided with a pair of lifting metal fittings 2A on the upper part thereof and can be lifted by a crane, and a mounting substrate 2B for connecting a chuck is mounted on the lower part. The columnar main body 2 is a portion that is held and pulled up by a holding body of a power casing jack, which will be described later, and has a strength that can withstand this and a length that can perform a pulling-type raising described later.

The mounting shaft 3 has a mounting hole 2C in the mounting substrate 2B.
The upper end of the steel pipe pile P so as to project into the upper end portion of the steel pipe pile P. The connection fitting 4 includes a connection board 4A placed on the upper end of the steel pipe pile P,
The columnar main body is formed below the mounting board 2B by including the ring-shaped guide plate 4B that covers the outer surface of the upper end of the steel pipe pile P and inserting the mounting shaft 3 into the insertion hole 4C that is formed in the center of the connection board 4A. It is possible to move relative to 2 in the pull-out direction. The guide plate 4B may be composed of two wedge-shaped members, which are superposed on each other and connected by bolts (see FIG. 1).

The gripping claw 5 has a claw member 5A having a gripping surface 5a which is in an arcuate shape in plan view and is capable of contacting the inner surface of the steel pipe pile P.
This claw member is composed of a pair of support levers 5B attached to the tip of the upper part, and by attaching the base of the support lever 5B to the tip of the attachment shaft 3 via the horizontal pin 7, the gripping surface 5a becomes the inner surface of the steel pipe pile P. Configure to retreat to. The connection link 6 connects the connection board 4A and the top end of the grip claw 5, and both ends of the connection board 4 are connected to each other.
The lower end of A and the upper part of the support lever 5B are oscillated by being mounted via a pin 8, and the vertical movement of the mounting shaft 3 prevents the upper end portion of the gripping claw 5 from moving up and down. It is a member that moves back and forth with respect to the inner surface.

The lengths and angles of the gripping claws 5 and the connecting links 6 are such that when the mounting shaft 3 rises with respect to the connection fitting 4, the gripping surface 5a is pressed against the inner surface of the steel pipe pile P, and when it descends, the gripping surface 5a. Is set to be separated from the inner surface of the steel pipe pile P by a predetermined distance. In addition, connecting pieces 9 and 10 that overlap each other are provided on the side surfaces of the mounting board 2B and the connection board 4A, respectively. 4A is fixed in a state of abutting, and the grip claw 5 can be held in an open state in which the grip surface 5a is separated from the inner surface of the steel pipe pile. The grip claws 5 are arranged in pairs on both sides of the mounting shaft 3 so that the grip claws 5 can be gripped over the entire inner surface of the steel pipe pile P. Further, the gripping surface 5a is provided with a large number of teeth parallel to the extraction direction, for example.

The power casing jack 12 is shown in FIG.
As shown in FIG. 4, for example, four jacks 13 fixed on the reaction table 14 and driven in synchronization with each other, and connected to a movable body of the jacks 13 are opened and closed to hold the columnar main body 2. It is composed of a pair of holding bodies 15 to be obtained, and is configured so that the columnar main body 2 can be held and raised, and the holding can be released and lowered to raise the columnar main body 2 in a lengthy manner.

With the above construction, the pulling device 1 operates as follows. By connecting the connecting pieces 9 and 10 with the fixing pin 11, the pair of gripping claws 5 are held in an open state in which the gripping surfaces 5a are retracted from the inner surface of the steel pipe pile, and the columnar main body 2 is hung by a crane, and the lower chuck part is held. Is fitted to the upper end of the steel pipe pile P. At this time, the ring-shaped guide plate 4B of the connection fitting 4 serves as a guide, and the grip claws 5 are smoothly inserted into the steel pipe pile P. Remove the fixing pin 11 to remove the power casing jack 1
When the columnar main body 2 is lifted by 2 for example by about 50 mm, the mounting shaft 3 rises with respect to the connection fitting 4, and the gripping surface 5a of the gripping claw 5 advances toward the inner surface of the steel pipe pile P by the action of the connecting link 6. The inner surface of the steel pipe pile P is pressed to tighten the steel pipe pile P from the inside.

When the columnar main body 2 and the steel pipe pile P are integrated and the columnar main body 2 is lifted by the power casing jack 12, the steel pipe pile P is pulled out. When the steel pipe pile P is pulled out to a predetermined height by sequentially holding the columnar main body 2, raising the jack 12 by one stroke, releasing the holding, and lowering the jack 12 by one stroke, the columnar main body 2 is jacked by the jack 12. Thus, when the steel pipe pile P is lowered, the grip claws 5 are opened. When the connecting pieces 9 and 10 are connected by the fixing pin 11,
The grip claw 5 is fixed in the open state. The columnar main body 2 is hung by a crane and removed from the upper end of the steel pipe pile P.

FIG. 4 shows an example applied to the drawing of a steel pipe sheet pile, and the drawing is carried out by the following procedure. Attach the reaction caps 16 to the upper ends of the steel pipe piles on both sides,
The reaction force base 14 is installed on this. The power casing jack 12 is installed on the reaction table 14, and the drawing device 1 is connected to the upper end of the steel pipe pile P.
The holding body 15 holds the columnar main body 2. The power pipe jack 12 pulls out the steel pipe pile P in a lengthwise manner. The upper portion of the steel pipe pile P that has been pulled out is cut and removed. Backfill the filling soil and repeat the above steps until the junction comes off. When the junction comes off, pull out the bow. In the above, the case of pulling out the steel pipe pile has been described, but it goes without saying that the present invention can be applied to pulling out piles and sheet piles having other shapes.

[0015]

As described above, in the pulling device of the present invention, the mounting shaft is provided at the tip of the columnar main body to which the jack is connected, the connecting metal is movably provided on the mounting shaft, and the mounting shaft is gripped at the lower end of the mounting shaft. The claw is pivotally mounted so that its tip gripping surface can advance and retreat with respect to the inner surface of the steel pipe pile, and this gripping claw and the connecting fitting are connected via a connecting link, and the columnar body is moved up and down to open and close the gripping claw. Since the columnar main body is gripped and pulled up, the following effects are obtained. (1) Since the columnar main body is pulled up by the jack and the gripping area can be increased, the pile is deformed,
It can be pulled out without cutting. (2) Since it is pulled out by the jack, the construction can be performed without vibration and noise. (3) The construction speed is high, and safe extraction can be performed. (4) The pile can be easily attached and detached.

[Brief description of drawings]

FIG. 1 is a schematic view showing a drawing device of the present invention, (a)
Shows the state where the chuck is closed, and (b) shows the state where the chuck is opened.

FIG. 2 is a vertical cross-sectional view showing an embodiment of the drawing device of the present invention.

3A is a view taken along the line IIIa-IIIa in FIG.
(B) is a IIIb-IIIb line sectional view of FIG.

FIG. 4 is a schematic view showing an example of drawing a steel pipe sheet pile by using the drawing device of the present invention in the order of steps.

[Explanation of symbols]

1 Pulling Device 2 Columnar Body 3 Mounting Shaft 4 Connection Metal Fitting 5 Grip Claw 6 Connection Link 12 Power Casing Jack 15 Holding Body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Ando 9-39 Mizuki-dori, Hyogo-ku, Kobe-shi, Hyogo

Claims (1)

[Claims] 1. A columnar main body to which a jack is connected is provided with a mounting shaft projecting in the pulling-out direction at the lower end thereof, and a connecting metal fitting is provided on the mounting shaft so as to be movable in the pulling-out direction, and a grip claw is provided at the lower end of the mounting shaft. A pulling-out device for steel pipe piles or the like, wherein the tip gripping surface is axially mounted so as to be capable of advancing and retracting with respect to the inner surface of the pile, and the tip end portion of the gripping claw and the connecting fitting are connected via a connecting link.