JPH0748981A - Bucket self-elevation type excavator - Google Patents

Abstract

PURPOSE:To facilitate working by providing a bucket having a guide in a casing pipe, and providing a lock means interlocking with the guide with rotation in the direction of excavation and releasing the interlock with the rotation opposed to the direction of excavation in the pipe. CONSTITUTION:The ground is excavated in the shape of a ring up to specific depth with a casing 1. Then, after the casing 1 is pulled up to the initial position, a bucket 6 is suspended in the casing 1 with a crane with a guide 6a as the guide. After that, when the guide 6a reaches a groove 4a of a locking groove 4 provided to a first pipe 3, the casing 1 is rotated in the direction of excavation to interlock the guide 6a with a groove 4b. When the casing 1 is retated and is driven forward, the bucket 6 excavates the inside of the casing 1, and earth is taken in. In addition, when a specific amount of earth is excavated, the casing 1 is reversely rotated, and after the engagement of the guide 6a with the groove 4b is released, the bucket 6 is pulled up to move earth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for drilling a hole in which a casing pipe is connected to a first pipe having a plurality of drag bits provided in a sawtooth shape on the end face of a steel pipe.

[0002]

2. Description of the Related Art There is known a technique in which the ground height in a casing and the indentation depth of an excavating device for excavating the casing are measured to fix and position the excavating device in the casing for excavating.

[0003]

However, since the pushing distance of the bucket changes every time depending on the promotion of the casing and the discharge condition of the earth and sand in the pipe, it is a troublesome work because it is measured and managed each time. It took a lot of work.

Therefore, the present invention provides a bucket self-elevating excavator which has a simple structure and is capable of excavating the inside of the casing by locking the casing by rotating the casing when the bucket is inserted to a predetermined depth. Has an aim.

[0005]

According to the present invention, in a drilling device for drilling a hole, a first pipe having a plurality of drag bits provided in a sawtooth shape on an end surface of a steel pipe is connected to a casing pipe, and A bucket is provided on the bucket, and at least three guides are provided on the bucket so as to be coaxial with the casing pipe. The guide is engaged at a predetermined depth of the casing pipe by the rotation in the excavation direction and engages with the guide to rotate in the reverse direction to the excavation direction. Locking means for releasing the engagement is provided.

[0006]

[Description of Operation and Effects] In the bucket self-elevating excavator constructed as described above, the guide attached to the bucket keeps the bucket coaxial with the casing, and when the guide reaches a predetermined depth in the casing, the guide moves. The rotation of the casing in the excavating direction engages with the locking means provided on the inner circumference, and the excavating device in the casing performs the same rotation, propulsion, and withdrawal operations as the casing.

When the casing is rotated in the reverse direction, the guide is disengaged from the casing and only the bucket can be taken out of the casing.

Therefore, it is not necessary to measure the depth for each excavation.

[0009]

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

In FIG. 1, one end of a casing 1 is connected to a rotating / propelling device 2, a first pipe 3 is attached to the other end, and a drag bit 5 is attached to the tip of the first pipe 3.

Further, at a predetermined position on the inner circumference of the first pipe 3, there is provided a locking groove 4 which is a locking means with which a guide 6a provided on the bucket 6 is engaged, and the groove 4 is aligned with the axis of the first pipe 3. The parallel groove 4a and the groove 4a and the groove 4b extending along the circumference in the direction perpendicular to the groove 4a are formed in an L shape, and are provided at three positions on the circumference in the illustrated example.

As shown in FIG.
2, a plurality of (three in the illustrated example) guides 6 are attached.

The guide 6a is formed in an arc shape along the outer circumference of the bucket 6, and the width dimension B of the arc portion is equal to the groove width 4a of the lock groove 4 provided in the first pipe 3. .

Further, the height dimension A of the arc portion is the groove width 4b.
Is configured equal to.

Therefore, when the guide 6a is engaged with the lock groove 4 in the bucket 6 suspended in the casing via a hole 6b of the bucket in the casing, the casing 1 is not shown.
With it, it can rotate in the direction of excavation.

The lower end of the bucket 6 constitutes a cutter 8 having a drag bit 7, and the cutter 8 has a hinge 6.
It is attached to the bucket 6 with d and a lock 6c.

The operation will be described below.

First, when the casing 1 is excavated in a ring shape to a predetermined depth, the casing 1 is returned to its original position, and the bucket 6 is suspended in the casing 1 by a not-shown crane using the guide 6a as a guide.

When the guide 6a reaches the locking groove 4a, if the casing 1 is rotated in the excavating direction, the guide 6a will move into the groove 4b.
Engage with. So, rotate the casing in the direction of excavation,
If propelled, the bucket 6 excavates the inside of the casing and takes in the earth and sand into the bucket.

After excavating a predetermined amount, the casing 1 may be reversely rotated to release the engagement between the guide 6a and the groove 4b, pull up the bucket 6, and discharge the earth and sand in the bucket.

If the same operation is repeated below, the hole can be easily and efficiently excavated.

FIG. 4 shows another embodiment of the present invention, which is a block 14a formed in an inverted L-shape at the bottom of the casing 1.
This is the same as the first embodiment except that the L-shaped lock groove 14 is formed by welding the bar-shaped block 14b and the block-shaped block 14b, and the operation is the same.

If the upper surface of 14a is inclined in a direction along the circumference like C, and the lower portion of the guide 6a shown in FIG. It is preferable to prevent the guide 6a from easily entering the groove 14 due to collision between the surfaces during the engagement.

[0024]

Since the present invention is configured as described above, the excavation depth is determined from the condition of the discharged soil and the power of the propulsion device, and the depth is measured each time to excavate the bucket. You don't have to decide the depth.

Therefore, the work is easy and the man-hour and the work time are small, which contributes to the shortening of the work period.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing the bucket of FIG.

FIG. 3 is a diagram showing a side cross-section of a main part of the excavator of FIG.

FIG. 4 is a perspective view showing another embodiment of the locking groove of the present invention.

[Explanation of symbols]

 1 ... Casing 2 ... Rotation / Propulsion Device 3 ... First Pipe 4, 14 ... Lock Groove 5, 7 ... Drag Bit 6 ... Bucket 8 ... Cutter 9 ... Bucket

Claims (1)

[Claims] 1. A drilling device for drilling a hole by connecting a first pipe having a plurality of drag bits provided in a sawtooth shape on an end surface of a steel pipe to a casing pipe to provide a bucket in the casing pipe, and the bucket has the bucket. Guides are provided at at least three locations so as to be coaxial with the casing pipe, and locking means is provided at a predetermined depth of the casing pipe to engage with the guides by rotating in the excavating direction and release the engagement by rotating in the reverse direction to the excavating direction. A bucket self-lifting excavator that is characterized.