JPH0726867A - Bucket self-elevation type excavating device - Google Patents

Abstract

PURPOSE:To separate propulsion of a casing and propulsion of bucket from each other by a method wherein an expanding contracting means to transmit a rotation force and increase and decrease a distance between a bucket device and a gripper device is located between the bucket device to excavate the interior of a casing and the gripper device to fix the bucket device to the casing. CONSTITUTION:A kelley-bar 9 is expandably and contractably attached to the inner side of a gripper device 6 through a hydraulic jack 8 and a Kelley-bar guide 9a in a manner to transmit a rotation force to a bucket device 10. By means of a signal from a control device 5, a gripper device 6 is fixed on the inside of a casing 1 by a gripper 6a. By feeding pressure oil to a hydraulic cylinder 8 through an accumulator 7, the bucket device 10 is pressed down based on the casing 1 by the Kelley-bar 9 and a rotation force is transmitted in a state that a relative position between the casing 1 and the bucket device 10 is changed. This constitution performs independent propulsion of the casing and the bucket from each other and employs a plurality of excavation method, such as casing precedence and bucket precedence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a first tube in which a plurality of drag bits are provided in a sawtooth shape on an end surface of a steel pipe at a tip portion of a casing pipe, and the casing is rotated to excavate and take in the inside thereof. Regarding the device.

[0002]

2. Description of the Related Art For example, as shown in FIG. 9, a rotating / propulsion device 17 in which a casing pipe 1 is connected to a power supply device 16.
The bucket device 10 is provided with a bucket device 10 for fixing the bucket device 10 or the screw conveyor device for excavating and taking in the inside thereof to the casing pipe.
Alternatively, a technique in which the conveyor device 15 and the conveyor device 15 are mutually fixed is known.

[0003]

However, in the above technique, since the casing inner surface and the bucket device are fixed by the gripper device, the drag bit at the tip of the casing and the cutter of the bucket device excavate at the same time when the casing is propelled. Therefore, there is a problem that the excavation force becomes large.

Therefore, it is an object of the present invention to provide a bucket self-elevating excavator in which the casing propulsion and the bucket propulsion can be separated and the propulsion capability is improved.

[0005]

According to the present invention, a fast tube having a plurality of drag bits provided in a sawtooth shape on an end surface of a steel pipe is provided at a tip portion of a casing pipe, and the casing is rotated to excavate the inside thereof. In the digging device that takes in the water, between the bucket device that digs the inside and the gripper device that fixes the bucket device to the casing, an expansion / contraction means that can transmit a rotational force and can expand / contract the gap between the bucket device and the gripper device. A control device for controlling the expansion and contraction means is provided.

[0006]

In the bucket self-elevating excavator constructed as described above, the casing propulsion and the bucket propulsion can be arbitrarily selected, so that the casing propulsion and the internal excavation intake can be performed separately. It enables deeper and larger diameter excavation with the same rotary and propulsion device.

Alternatively, in the drilling work having the same specifications, it is possible to work with a rotary / propulsion device having a smaller capacity.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a casing 1 is attached to a casing rotation / propulsion device (not shown), and its tip portion 1
A fast tube 2 is fixed to a, and a drag bit 2a is attached to the tip of the first tube 2 in a sawtooth shape.

Further, inside the casing 1, a bucket 10 for excavating the inside of the casing 1 through a wire 4 on a hook 3 of a Clen not shown, a gripper device 6 and a space between the bucket 10 and the gripper device 6. The kelly bar 9 which is an expansion / contraction means for expanding / contracting the space and its control device 5 are suspended.

The gripper device 6 is provided with a plurality of grippers 6a in upper and lower two stages, and a gripper jack 6b.
Then, the gripper device 6 is fixed to the center of the casing 1. Here, reference numeral 7 indicates an accumulator.

Also, referring to FIGS. 2 and 3, inside the gripper device 6, a kerry bar 9 can transmit a rotational force to the bucket device 10 via a hydraulic jack 8 and a kelly bar guide 9a. And it is attached so that it can expand and contract.

Therefore, referring to FIG. 4, in response to a signal from the control device 5, the gripper device 6 is fixed in the casing 1 by the gripper 6a, and pressure oil is sent to the hydraulic cylinder 8 via the accumulator 7, so that the kelly bar 9 is removed. The rotating force can be transmitted in a state where the bucket 10 is pushed down with respect to the casing 1 and the relative positions of the casing 1 and the bucket 10 are changed.

The excavation method will be described below with reference to FIGS.

The casing 1 is rotated and propelled to excavate a groove inside and outside the casing 1 (FIG. 5).

At this time, since the earth and sand, rocks, etc. in the casing 1 rotate together with the casing, even if the bucket 10 is pushed in, the earth and sand cannot be taken into the bucket (FIG. 6).

With the bucket pressed against the earth and sand surface, only the casing 1 is pulled up to a height at which the earth and sand do not rotate (FIG. 7).

If the bucket 1 is fixed to the casing 1 by the gripper 6a and the casing is rotated and propelled, the tip of the casing can be loaded into the bucket 10 without excavating,
Just pull it up (Fig. 8). Since the casing and the bucket are not simultaneously excavated, the excavation force is small.

[0019]

Since the present invention is configured as described above, the casing and the bucket can be independently propelled, so that the characteristics of the ground and the power of the rotation / propulsion device of the casing installed on the ground can be used. A plurality of excavation methods such as casing leading and bucket leading can be adopted, and efficient construction can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a bucket self-lifting excavator according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a main part of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a perspective view of the excavator of FIG. 1 with a kelly bar extended.

FIG. 5 is a view showing a state where the casing is dug.

FIG. 6 is a diagram showing a state in which a bucket is lowered.

FIG. 7 is a view showing a state where the casing is pulled up in the state of FIG.

FIG. 8 is a view showing a state in which earth and sand are taken into a bucket and pulled up.

FIG. 9 is a perspective view showing an example of a conventional technique.

[Explanation of symbols]

 1 ... Casing 2 ... First tube 4 ... Wire 5 ... Control device 6 ... Gripper device 7 ... Accumulator 8 ... Hydraulic cylinder 9 ... Kerry bar 10 ... Bucket

Claims (1)

[Claims] 1. An excavating device in which a first tube having a plurality of drag bits provided in a sawtooth shape on an end surface of a steel pipe is provided at a tip portion of a casing pipe, and the casing is rotated to excavate and take in the inside thereof. Between the bucket device and the gripper device for fixing the bucket device to the casing, an expansion / contraction means capable of transmitting the rotational force and expanding / contracting the interval between the bucket device and the gripper device is provided,
A bucket self-elevating excavating device, characterized in that a control device for controlling the expanding and contracting means is provided.