JPH09111763A - Device for pulling-out casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate pull-out of a casing. SOLUTION: A pair of hydraulic jacks 6 and 8 arranged on both sides of a casing 1 driven in a ground are provided. A beam member 26 spans between the hydraulic jacks 6 and 8 across a position above the casing 1. First suspension metal fittings 44 and 46 are oscillatorily and slidably suspended from fulcrum axles 32 and 34 horizontally supported at the beam member 26 and second suspension metal fittings 48 and 50 oscillatorily coupled to first suspension metal fittings 44 and 46 are connected to a casing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing pulling device for pulling out a casing embedded in the ground when constructing a pile hole.

[0002]

2. Description of the Related Art Conventionally, in a reverse circulation method (hereinafter referred to as a reverse method) and an earth drill method, a stand pipe or a casing called a surface casing is built during pile construction to prevent collapse of a hole wall near the surface. Etc.

In the reverse construction method, water is injected into the casing, the excavation bit at the tip of the drill excavates, and the earth and sand are drained together with the muddy water for excavation. Further, in the earth drill method, a drilling bucket is inserted into the casing, the drilling bucket is rotated to excavate, and the excavated earth and sand is taken into the drilling bucket. Then, the drilling bucket is pulled up to remove the soil. After the pile hole was formed, the reinforcing rod cage was inserted and concrete was placed, and then the wire rope was connected to the casing and pulled out from the ground by the crane.

[0004]

However, since lateral pressure from the hole wall is applied to the casing, it cannot be pulled out easily, and in some cases, the wire rope breaks, especially during the period when the casing was built. When the length is long, there is a problem that a large pulling force is required and the pulling is not easy.

An object of the present invention is to provide a casing pulling-out device which can pull out the casing easily.

[0006]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, a pair of jacks installed on both sides of a casing built in the ground are provided, and a beam member is stretched across the casing between the jacks, and the beam members are provided at intervals according to the diameter of the casing. A casing pulling-out device is characterized in that a pair of hanging metal fittings are swingably suspended and the hanging metal fittings and the casing are connected to each other.

Further, the hanging metal fitting may be slidably and slidably hung on a fulcrum shaft horizontally supported by the beam member, and the hanging metal fitting oscillates on the fulcrum shaft. A first suspension fitting that is movably and slidably suspended;
A second suspending member may be provided so as to be swingably connected to the first suspending member and connected to the casing.

Alternatively, the beam member may be expandable / contractible in the axial direction, and the beam member may be divided and an extension member may be interposed therebetween.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a casing, which is built by a vibro hammer or the like (not shown) when constructing a pile hole. As shown in FIG. 4, the casing 1 is provided with a pair of through holes 2 and 4 at its upper edge in advance.

A pair of hydraulic jacks 6 and 8 are installed on both sides of the casing 1, and the hydraulic jacks 6 and 6 are provided.
8 includes hydraulic cylinders 10 and 12, and hydraulic cylinder 1
The rod sides of 0 and 12 are fixed to the bases 14 and 16. A pair of guide plates 18 to 21 are erected on the bases 14 and 16 along the hydraulic cylinders 10 and 12, respectively, and slidably support the outer circumferences of the cylinder tubes of the hydraulic cylinders 10 and 12. There is.

Mounting bases 22 and 24 are fixed to the cylinder tubes of both hydraulic cylinders 10 and 12 so as to face each other (see FIG. 4). The mounting bases 22 and 24 are provided with beam members 26. The fixed bases 28 and 30 at both ends are fixed. The beam member 26 extends across the casing 1 and is stretched between the mounting bases 22 and 24.

A pair of fulcrum shafts 3 are provided on the lower surface of the beam member 26.
Support member 3 in which 2, 34 are projected from the lower surface of the beam member 26
6 to 39 are inserted and supported. Both fulcrum shafts 32,
The intervals of 34 are arranged so as to be substantially equal to the diameter of the casing 1. A pair of latch members 40 and 42 are attached to the upper surface of the beam member 26 at predetermined intervals.

On both fulcrum shafts 32 and 34, first suspension fittings 44 and 46 are swingable, and fulcrum shafts 32 and 3 are provided.
4 is slidably inserted and hung in the axial direction. The second suspension metal fittings 48, 50 are swingably connected to and suspended from the first suspension metal fittings 44, 46 by pins 52, 54. The second suspension fittings 48, 50 are connected to the casing 1 by bolts 56, 58 inserted into the through holes 2, 4 of the casing 1 (see FIG. 4). In this embodiment, the first hanging metal fittings 44 and 46, the second hanging metal fittings 48 and 50,
The pins 52 and 54 form a hanging fitting, but the first
The hanging metal fittings 44, 46 and the second hanging metal fittings 48, 50 may be formed by an integral member.

Next, the operation of the above-mentioned casing withdrawing apparatus of this embodiment will be described. Insert the rebar cage in the pile hole,
When the casing 1 is pulled out after pouring concrete, the wire rope 60 is hung on the latch members 40 and 42 as shown in FIG. It is hoisted by a crane (not shown) so that both hydraulic jacks 6 and 8 are installed on both sides of the casing 1 and the beam member 26 passes through the center of the casing 1 and crosses it.

After that, the first suspension fittings 44, 46 and the second
The first suspension fittings 44, 46 are attached to the fulcrum shaft 32, so that the suspension fittings 48, 50 are spaced according to the diameter of the casing 1.
Slide along 34. After adjusting the distance, the second suspension fittings 48, 50 and the casing 1 are connected by the bolts 56, 58.

Then, the hydraulic cylinders 10 and 12 are driven to the extension side to raise the beam member 26. Therefore, FIG.
As shown in (b), the support members 36 to 39 and the fulcrum shaft 3
2, 34, first hanging metal fittings 44, 46, pins 52, 54,
The casing 1 is pulled out from the ground through the second suspension fittings 48, 50 and the bolts 56, 58. When the casing 1 is pulled out from the ground even a little, the frictional resistance between the outer periphery of the casing 1 and the hole wall is drastically reduced, and thereafter it can be pulled out with a small force. Therefore, the hydraulic cylinders 10 and 12 do not require a stroke for completely withdrawing the casing 1.

After maximally extending the hydraulic cylinders 10 and 12, the whole is lifted by a crane (not shown) and the casing 1 is completely pulled out. Also, the hydraulic cylinder 10,
12 is driven to the reduction side, the casing 1 is moved to a place away from the pile hole by the crane, and slowly lowered to the ground.

At this time, as shown in FIG. 2D, when the casing 1 is brought into contact with the ground and then lowered by moving the casing extracting device laterally by a crane, the casing 1 is laid down sideways. At that time, the first suspension fittings 44, 46
And the second suspension fittings 48, 50 are the fulcrum shaft 34, the pin 52,
By relatively swinging around 54 and bolts 56 and 58, the casing pulling-out device is maintained in a state of being suspended vertically from the wire rope 60.

Then, as shown in FIG. 2 (e), after the casing 1 is completely laid down sideways, the bolts 56 and 58 are removed to disconnect the second suspension fittings 48 and 50 from the casing 1. Next, as shown in FIG. 2F, the casing pulling-out device is lowered to the ground, and the work is completed.

Next, a second embodiment different from the above-mentioned embodiment will be described with reference to FIG. The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The same applies hereinafter. In the second embodiment, the above-mentioned beam member 26 is different, and the beam member 70 of the second embodiment is provided with square tube members 72 and 74 to which the fixing bases 28 and 30 are attached respectively, and both square tube members 72 and 74. A connecting member 76 made of I-shaped steel is slidably inserted in the. Both fixed bases 28,
30 and the connecting member 76 are connected to the cylinders 78 and 80, respectively.
Connected by

By extending and retracting the cylinders 78 and 80, the interval between the hydraulic jacks 6 and 8 can be changed, and the first suspension fittings 44 and 46 and the second suspension fitting 4 can be changed.
The spacing of 8, 50 can be varied to accommodate casings 1 of various diameters.

Next, a third embodiment will be described with reference to FIG. The beam member 90 of the third embodiment includes arm members 92 and 94 to which the fixed bases 28 and 30 are attached, and flange portions 96 and 98 are provided on the arm members 92 and 94 so as to face each other. . An extension member 104 having flange portions 100 and 102 provided at both ends is interposed between the arm members 92 and 94, and the flange portions 96 and 9 are provided.
8, 100 and 102 are joined by a bolt (not shown).

By preparing various extension members 104 having different lengths in advance and exchanging the extension members 104, the distance between the hydraulic jacks 6 and 8 can be changed as in the second embodiment. It is possible to change the interval between the first suspension fittings 44 and 46 and the second suspension fittings 48 and 50, and it is possible to accommodate casings 1 having various diameters. Moreover,
It can be implemented with a simple configuration.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0025]

As described above in detail, in the casing extracting device of the present invention, the hanging metal fitting is connected to the casing and the casing is pulled out by the jack, so that the casing can be reliably and easily pulled out. Since the oscillates, it is easy to lay the casing over after it is pulled out. Further, by making the suspending metal slidable on the support shaft, the position of the suspending metal can be easily aligned with the outer periphery of the casing 1. Further, the beam member can be expanded and contracted in the axial direction, and the extension member can be interposed, so that it is possible to cope with casings having various diameters.

[Brief description of the drawings]

FIG. 1 is a perspective view of a casing pulling device as an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a procedure of pulling out using the casing pulling-out device of the present embodiment.

FIG. 3 is an explanatory diagram showing a procedure of laying down a casing after being pulled out by using the casing pulling-out device of the present embodiment.

FIG. 4 is a front view of a casing pulling-out device according to a second embodiment.

FIG. 5 is a front view of a casing pulling-out device according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 6, 8 ... Hydraulic jack 26, 70, 90 ... Beam member 32, 34 ... Support shaft 44,46 ... First suspension metal fitting 48, 50 ... Second suspension metal fitting 104 ... Extension member

Claims (5)

[Claims] 1. A pair of jacks installed on both sides of a casing built in the ground, wherein a beam member is stretched across the casing between the jacks, and the beam member is provided to the beam member according to the diameter of the casing. A casing pulling-out device, characterized in that a pair of hanging fittings are oscillatedly suspended at different intervals to connect the hanging fittings to the casing. 2. The casing pulling-out device according to claim 1, wherein the suspending metal hangs slidably and slidably on a fulcrum shaft horizontally supported by the beam member. 3. The hanging metal fitting is connected to the casing so as to swingably and slidably hang on the fulcrum shaft and a first hanging metal fitting swingably connected to the first hanging metal fitting. The second pulling metal fitting is provided, The casing pulling-out device according to claim 2, wherein. 4. The casing withdrawing device according to claim 1, wherein the beam member is capable of expanding and contracting in the axial direction. 5. The casing withdrawing apparatus according to claim 1, wherein the beam member is divided and an extension member can be interposed between the divided beam members.