JPH07216885A - Casing tube - Google Patents

Abstract

PURPOSE:To provide a casing tube which can excavate the ground in order to draw out an existing pile without damaging it. CONSTITUTION:A spiral blade 16 in which an existing pile 15 can be inserted is formed at the inner periphery of a casing tube 10 having a diameter with which the casting tube defines a predetermined gap A between itself and the outer periphery of the existing pile 15, extending from the front end to rear end of the casing tube 10 which is therefore thrust into the ground by swinging or rotating the casing tube 10. The ground is excavated by cutting blades 17, 18 at the front end of the casing tube 10 while sediment around the pile 15 is discharged upward in order to remove friction between the pile 15 and the ground, thereby it is possible to easily withdraw the pile 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing tube having a digging blade attached to its tip and pushed into the ground by rocking or rotating.

[0002]

2. Description of the Related Art Conventionally, as a device for pushing a casing tube having an excavating blade attached to its tip to the ground by swinging or rotating, for example, a tubing device disclosed in Japanese Patent Laid-Open No. 63-251520 has been proposed. There is known an all-casing construction method in which a casing tube is pushed in using such an apparatus and the earth and sand inside is discharged to construct a foundation resistance.

In a place where there is an existing building at the construction site, as in the case of urban redevelopment, there may be existing piles. When constructing a new building in such a place, it is necessary to eliminate existing piles. In such a case, the tubing device pushes the casing tube, which is slightly larger than the existing pile, coaxially with the existing pile by rotating or the like. Then, the existing pile in the casing tube is destroyed by dropping a chisel or the like and taken out by a hammer mag, or it is destroyed by rotating an auger screw in the casing tube.

[0004]

However, in such a conventional one, in order to destroy and remove the existing pile, in addition to the tubing device, a proper strength and driving force of the crane and the auger device are required. It requires equipment to have, and the equipment becomes large-scale. In addition, there is a problem that noise is generated due to the destruction of the existing pile.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a casing tube for excavation so that an existing pile can be easily pulled out without breaking it.

[0006]

In order to achieve such an object, the present invention has the following constitution as means for solving the problem. That is, in the casing tube where the drilling blade is attached to the tip and is pushed into the ground by swinging or rotating, the existing pipe is attached to the inner periphery of the casing tube having an inner diameter that forms a predetermined gap with the outer periphery of the existing pile. That is, the structure of the casing tube is characterized in that spiral vanes into which the piles of

[0007]

When the casing tube having the above structure is pushed into the ground by swinging or rotating around the existing pile, the excavating blade excavates and the blade discharges the earth and sand around the existing pile. Remove the friction between the pile and the ground. Therefore, the existing pile can be easily removed with a crane or the like.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a tubing device, in which a lifting frame 4 for lifting a lifting frame 3 is assembled on a base frame 2 which is held in a horizontal state, and a ring shape is mounted on the lifting frame 3 via a bearing 5. The rotating member 6 is rotatably supported. A gear 7 is provided on the outer periphery of the rotating member 6.
Is formed, the drive gear 8a fixed to the rotary shaft of the hydraulic motor 8 provided on the elevating frame 3 and the gear 7 are meshed via the idle gear 9, and the rotary member 6 is rotated by the rotation of the hydraulic motor 8. Is configured.

A taper hole 11 through which the casing tube 10 can be inserted is formed on the inner circumference of the rotary member 6, and the taper hole 11 is formed so as to reduce its diameter downward. A bracket 13a that is moved up and down by a chuck cylinder 12 arranged on the elevating frame 3 is provided above the rotating member 6, and the rotating frame 1 is interposed between the bracket 13a and the rotating member 6 via a bearing 13b.
3c is supported and arranged so as to move up and down together with the bracket 13a. A wedge-shaped chuck member 14 suspended from the rotating frame 13c is inserted between the tapered hole 11 and the casing tube 10.

In this embodiment, the casing tube 10 comprises a plurality of casing tubes 10a, 10a having a predetermined length.
It is configured so that b can be added to form. In addition, the casing tube 10 is the existing pile 15
It has an inner diameter such that a predetermined gap A is formed between it and the outer periphery of the pile, and by removing the soil around the existing pile 15, the friction between the existing pile 15 and the ground can be removed. It suffices if the gap A has a predetermined size.

A spiral blade 16 is provided on the inner circumference of the casing tube 10, and the blade 16 is formed from the front end to the rear end of the casing tube 10.
The blades 16 are used for the casing tube 10 having a predetermined length.
blades 16a and 1 provided on the inner circumferences of a and 10b, respectively.
6b, each casing tube 10a, 1
When 0b is added, the blade 16 is formed so as to have a continuous spiral shape. Further, the inner diameter of the blade 16 is formed so that the existing pile 15 can be inserted therein, and there may be a certain gap between the inner circumference of the spiral blade 16 and the outer circumference of the existing pile 15. .

A plurality of digging blades 17 are attached to the tip of the casing tube 10, and in this embodiment,
A plurality of cutting blades 18 are also attached to the tip of the spiral blade 16. The excavating blade 18 can be excavated without providing it in the case of soft soil and may be provided depending on the soil quality.

Next, the operation of the casing tube of this embodiment will be described. First, the tubing device 1 is installed so that the center of the existing pile 15 coincides with the center of the casing tube 10, and the casing tube 10 is inserted into the tapered hole 11. Then, the chuck cylinder 12 is driven to lower the bracket 13a, and the chuck member 14 is moved through the bearing 13b and the rotating frame 13c.
Is inserted between the tapered hole 11 and the casing tube 10, and the rotating member 6 and the casing tube 10 are fastened by the chuck member 14.

Next, the hydraulic motor 8 is rotationally driven to rotate the rotary member 6 via the drive gear 8a and the idle gear 9, and the casing tube 10 is rotated along with the rotation of the rotary member 6.
Is rotated. Further, the elevating cylinder 4 is driven to lower the elevating frame 3, and the casing tube 10 is pushed into the ground through the rotating member 6, the chuck member 14, and the like.

When the casing tube 10 is rotated and pushed into the ground while excavating with the excavating blades 17 and 18, the earth and sand around the existing piles 15 are conveyed upward along the blades 16 and into the predetermined gap A. The corresponding soil around the existing pile 15 is discharged. If the length of the existing pile 15 is long,
The required number of casing tubes 10b are added and excavated.

After excavating to the vicinity of the tip of the existing pile 15 by the casing tube 10, the friction between the existing pile 15 and the ground is removed, and the existing pile 15 is removed by a crane or the like not shown. As described above, according to the casing tube 10 of the present embodiment, with a simple configuration in which the spiral blade 16 is provided on the inner circumference of the casing tube 10,
Since the friction between the existing pile 15 and the ground can be removed, the existing pile 15 can be easily removed with a crane or the like. In addition, at that time, since noise due to the breakage of the existing pile 15 is not generated, the existing pile 15 can be silently removed.

As described above, the present invention is not limited to such embodiments, and can be carried out in various modes without departing from the scope of the present invention.

[0018]

As described above in detail, the casing tube of the present invention has a simple structure in which spiral blades are provided on the inner circumference of the casing tube, and the friction between the existing pile and the ground is removed. Since it can be done, it can be easily removed without destroying the existing pile. In addition, since no noise is generated due to the destruction of the existing piles, it is possible to quietly remove the existing piles.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a casing tube as an embodiment of the present invention together with a tubing device.

[Explanation of symbols]

1 ... Tubing device 4 ... Lifting cylinder
6 ... Rotating member 10 ... Casing tube 16 ... Blade
17, 18 ... Drilling blade

Claims (1)

[Claims] 1. A casing tube having a drilling blade attached to the tip thereof and pushed into the ground by rocking or rotating, wherein the casing tube has an inner diameter that forms a predetermined gap with the outer circumference of an existing pile. A casing tube, wherein spiral blades into which the existing piles can be inserted are provided from the front end toward the rear end.