JPH11217831A - Ground cutting device of steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the ground cutting device capable of being applied only to ground cutting operation at the time of the drawing of a solid-drawn steel material such as H-steel, a steel sheet-pipe, etc., buried by driving and having high-load specifications. SOLUTION: The ground cutting device of the steel material is composed of a holder 2 supported onto a ground, a hydraulic jack 3 installed onto the holder 2, a rod 4 for drawing lifted and lowered by the jack operation of the hydraulic jack 3 and a chuck means 5 pivotally supported at the lower end of the rod 4 before and after a solid-drawn steel material S. In the hydraulic jack 3, the rod 4 is supported to the lifting-lowering body 3b of the hydraulic jack 3, and oil pressure is worked to the lifting-lowering body 3b and the rod 4 is elevated and lowered at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates mainly to the improvement and repair of seawalls and river embankments on bay shores, and particularly to the use of existing H-shaped steel or steel sheet piles buried by driving into ground. The present invention relates to a ground cutting device for cutting.

[0002]

2. Description of the Related Art In order to pull out a steel material that has already been constructed, a drawing device conventionally used continuously performs an initial ground-cutting operation and a subsequent drawing operation (drawing with a long stroke). The structure is such that the mechanical structure can withstand a load of only about 80 tons at most.

However, the implanted and buried steel materials include:
In order to prevent the settlement, a bulb-shaped resistor is mounted in the underground, so that a strong pulling force is required at the time of the first ground breaking operation (actually, 300 to 1000).
Tons of load resistance). Therefore, it is often practiced in actual construction to cut the buried steel material at an appropriate place above the resistor and leave the buried steel members, except for this, as they are. This may hinder subsequent construction at that location.

[0004]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above circumstances, and focuses on the fact that the grounding operation of a steel material can be realized in the first short stroke, and can be applied only to the grounding operation. It is an object of the present invention to provide a high-load specification ground separation device.

[0005]

Therefore, in the present invention,
In a steel grounding device for grounding drawn steel materials such as H-shaped steel and steel sheet pile buried by driving,
Before and after the steel material to be drawn, a gantry supported on the ground, a hydraulic jack provided on the gantry, a pulling rod that moves up and down by jacking the hydraulic jack, and a chuck pivotally supported at the lower end of the rod The hydraulic jack has a structure in which the rod is supported by an elevating body thereof, and a hydraulic pressure is applied to the elevating body to move the rod up and down.

In this case, the chuck means includes a suspending body having a pair of support claws approaching to a lower end, and a wedge member which wedges between the steel material to be drawn and the support claws when the rod is raised. It is good to be constituted by. Also,
It is preferable that the pulling rod has a male screw portion screwed to the elevating body so as to be adjustable in position.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a steel material partitioning device according to the present invention. Here, a steel grounding device for grounding a steel material S to be drawn such as an H-shaped steel or a steel sheet pile buried by driving is supported on the ground via a stock 1 before and after the steel material S to be drawn. A hydraulic jack 3 provided on the gantry 2, a pull-out rod 4 that moves up and down by jacking of the hydraulic jack 3, and chuck means 5 pivotally supported by a lower end of the rod 4.

The hydraulic jack 3 supports the rod 4 on an elevating body 3b via a female screw 3a screwed into a male screw 4a formed on the rod 4 so as to be position-adjustable.
The structure is such that the hydraulic pressure acts on the elevating body 3b to move the rod 4 up and down. The male screw portion 4a and the female screw portion 3a form a so-called connecting screw such as an angle tooth or a square tooth in order to secure a sufficient pulling force when the rod 4 is moved up and down. ing.

In this embodiment, the elevating body 3b
Is provided with a through-hole 3c through which the rod 4 penetrates, and in this through-hole 3c, a female screw portion 3a is provided in the form of an independent nut that comes into contact with the elevating body 3b from below.
A lock nut 6 for tightening the elevating body 3b together with the nut is screwed to the upper end of the rod 4 in an adjustable manner.

[0010] The chuck means 5 includes a hanging body 5b having a pair of support claws 5a, 5a approaching the lower end.
When the rod 4 is lifted, the steel material to be extracted and the supporting claws 5a, 5a
a, a pair of wedge members (pieces) 5c that move wedges,
5c.

In such a configuration, first, the hydraulic pressure of the hydraulic jack 3 is released, the rod 4 is lowered, and the support claw 5 is released.
The upper end of the steel material S to be drawn is introduced between a and 5a. Next, the wedge members 5c, 5c are inserted between the support claws 5a, 5a and the steel material S to be drawn (before inserted and placed between the support claws 5a, 5a, and the upper end of the steel material S to be drawn is placed therebetween. In this state, the female screw 3a is attached to the male screw 4a.
a, and the rod 4 is fixed to the lifting / lowering body 3b. Thereafter, when hydraulic pressure is charged to the hydraulic jack 3, the lifting / lowering body 3
b rises and lifts the suspension 5b via the rod 4.

Thus, between the supporting claws 5a, 5a,
Due to the wedge effect due to sliding friction, the upper end portion of the steel material S to be drawn is suspended by the suspension 5b, and by the operation of the hydraulic jack 3,
The steel material S to be drawn is raised within the range of the movable stroke of the jack. The output of the jack in this case is 300
Approximately 1000 tons, it is possible to sufficiently realize the pulling (ground cutting) of the steel material S to be drawn at the initial stage. afterwards,
By taking over the lifting operation to a large-stroke lifting device such as a crane, the lifting of the drawn steel material is completed.

[0013]

As described in detail above, the present invention relates to a steel grounding apparatus for grounding a drawn steel material such as an H-shaped steel or a steel sheet pile embedded by driving, and Before and after, a gantry supported on the ground, a hydraulic jack provided on the gantry, a pull-out rod that moves up and down by jack operation of the hydraulic jack, and chuck means pivotally supported at a lower end of the rod are constituted. The hydraulic jack has a structure in which the rod is supported by an elevating body, and hydraulic pressure is applied to the elevating body to move the rod up and down.

Therefore, when the steel material is drawn, a high-load ground-cutting operation in the initial stage is surely performed, so that it is not necessary to perform a treatment such as a conventional midway cutting, and the drawing operation of the steel material can be completed. This has the effect of facilitating subsequent construction at that location.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a steel material partitioning device according to the present invention.

FIG. 2 is also a front view.

[Explanation of symbols]

 S Steel to be drawn 1 Rootstock 2 Stand 3 Hydraulic jack 3a Female thread 3b Lifting body 3c Through hole 4 Rod 4a Male thread 5 Chuck means 5a, 5a Supporting claw 5b Suspension body 5c Through hole 6 Lock nut

Claims (3)

[Claims] 1. A steel drawing apparatus for drawing a steel material to be drawn such as an H-shaped steel or a steel sheet pile embedded by driving, a base supported on the ground before and after the drawn steel material, and , A pull-out rod that moves up and down by jack operation of the hydraulic jack, and chuck means that is pivotally supported at the lower end of the rod. And a lifting device for lifting the rod by applying hydraulic pressure to the lifting member. The chuck means includes a hanging body having a pair of support claws approaching to a lower end, and a wedge member which wedges between the steel material to be drawn and the support claws when the rod is raised. 2. The device according to claim 1, wherein
2. A steel ground separation device according to claim 1. 3. The apparatus according to claim 1, wherein the pull-out rod has a male screw portion screwed to a lifting body so as to be position-adjustable.