JPH0441757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-diameter pile hole drilling device used for building piles for foundation work and the like.

[Conventional technology]

As such a large-diameter pile hole drilling device, there is one in which a large-diameter casing is built into the ground while rotating or swinging, and a drilling bucket such as a hammer club is suspended from the upper end of the casing to remove earth and sand from inside the casing.

FIG. 5 shows an example. In the figure, 1 is a base machine having a moving mechanism 1a such as a crawler track. A leader mast 2 is erected at the front of the base machine 1, and a casing 3 is rotatably mounted thereon. A loading device 4 is provided so as to be vertically movable.

The rotary construction device 4 includes a hydraulic motor 5 and a speed reducer 6.
and a casing chuck device 7, and the reducer 6 has an annular shape with a casing through hole in the center.
It is attached to the leader mast 2 via a support bracket 8 so as to be movable up and down, the motor 5 is fixed to the reducer 6, and the chuck device 7 is attached below the reducer 6 so as to be rotatable. In addition, the rotary erection device 4 is provided with an elevating cylinder 9 on the outside of the reducer 6;
This cylinder 9 is the base machine 1 as shown in the figure.
In addition to being fixed to the side, it may also be placed in contact with the ground.

In the figure, 10 is an excavation bucket such as a grab bucket, which is suspended from a crane boom 11a from a crane vehicle 11 such as a crawler crane.

Casing 3 set on rotary erection device 4
When the hydraulic motor 5 is started, the chuck device 7 rotates via the reducer 6, and the chuck device 7 rotates while the outer periphery is gripped. Then, the rotary erecting device 4 descends along the leader mast 2, and the casing 3 is erected into the ground.

At that time, the hydraulic circuit of the lifting cylinder 9 is opened, and the lifting cylinder 9 gradually lowers due to its own weight. And the rotary construction device 4
When it reaches the lower end of the leader mast 2, the locking of the chuck device 7 to the casing 3 is released, and the elevating cylinder 9 is operated to extend, and the rotary erecting device 4
Push up and check the top of the casing 3 again and repeat the same operation.

In this way, the casing 3 is erected in a manner similar to that of an insect. At the same time, the excavation bucket 10 is inserted through the upper opening of the casing 3, and the earth and sand inside are discharged to create a hole.

[Problem that the invention seeks to solve]

As described above, in conventional equipment, separate vehicles are used for the base machine for erecting the casing and the machine such as a crane for suspending the excavation bucket, and a wide work base is required. Therefore, there are significant restrictions in places where a large excavation work space cannot be secured due to geographical reasons, such as in the case of driving restraining piles on the ground such as on a mountainside. Furthermore, using two vehicles increases equipment costs and makes the unit construction cost extremely expensive.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
Since it can be configured with a single base machine, it does not take up much space and can be constructed at low cost.In addition, when moving, the rotary erection equipment can be suspended and held using the same crane boom used to hang the excavation bucket. The object of the present invention is to provide a large-diameter pile hole drilling device that has the following features.

[Means for solving problems]

In order to achieve the above object, the present invention includes a reaction frame having a short leader mast vertically movably pivoted to the front end of a base machine having a crane boom, and a casing rotary erecting device attached to the leader mast. The gist is that it is mounted so that it can move up and down.

[Effect]

According to the present invention, a rotary erecting device rotates and inserts a casing into the ground, and an excavating bucket removes earth from the inside of the casing to create a pile hole. The hanging crane boom is mounted on a common base machine. The leader mast is erected on the base machine via a reaction frame, and when moving, if the rotary erecting equipment is lifted with a crane wire from the crane boom, the reaction frame rotates upward, and the leader mast and The rotary erection device is held diagonally suspended so that it does not interfere with the movement of the base machine.

〔Example〕

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

FIG. 1 is a side view showing one embodiment of the large-diameter pile hole drilling apparatus of the present invention, and the same components as in FIG. 5 showing the conventional example are given the same reference numerals.

1 in the figure shows a base machine equipped with a moving mechanism 1a such as a crawler track, and this includes a crane boom 11a.
Use a crawler crane, etc. with

A horizontal reaction force frame 12 is pivoted to the front end of the base machine 1 so as to be vertically movable.
A short leader mast 2 was erected from 2, and a fixing jack 13 was provided to protrude downward.

A rotary erecting device 4 for the casing is attached to the leader mast 2 by a support bracket 8 so as to be vertically movable, but the rotary erecting device 4 may be the same as the conventional one. That is, it consists of a hydraulic motor 5, a reduction gear 6, and a chuck device 7 of the casing. It is rotatably mounted below 6.

In the figure, numeral 9 is a lifting cylinder attached to the outside of the reducer 1, and in this embodiment, the rod end of the cylinder is designed to be able to touch the ground.

Next, usage and operation will be explained. The pile hole excavation work is the same as the conventional one, but the reaction frame 12 extends the fixed jack to touch the ground and maintain a horizontal state.

The casing 3, whose outer periphery is gripped by the chuck device 7 and set in the rotary erection device 4, is press-fitted into the ground in the manner of a shovel, and at the same time, the crane boom 1
An excavation bucket 10 suspended from 1a discharges earth and sand in the casing 3.

When performing excavation work in this manner, the casing holder 14 may be placed on the ground to take the reaction force of the lifting cylinder 9, as shown in FIG.

After the excavation work is completed, as shown in FIG. 4, the lifting cylinder 9 and the fixing jack 13 are retracted, and the end of the crane wire 11b from the crane boom 11a is connected to a part of the rotary erection device 4, for example, the front end of the reducer 6. If you stop it and lift it up, the reaction frame 12
The part rotates up and down, and the leader mast 2 and the rotary erection device 4 are held in an oblique state. Therefore,
It does not interfere with the running of the base machine 1.

〔Effect of the invention〕

As described above, the large-diameter pile hole drilling equipment of the present invention combines a casing rotary erecting device, a leader mast that supports the casing in a vertically movable manner, and a crane boom for suspending an excavation bucket and the like into one base machine. Since it is installed in a small area, the entire structure is compact and can be used even in a narrow construction site, and the equipment cost can be reduced.

Furthermore, when the base machine is moved, the rotary erection device is suspended and held by the crane boom, making it easy to use.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the large-diameter pile hole drilling equipment of the present invention, Fig. 2 is a plan view of the main parts of the same, Fig. 3 is a side view of the main parts during operation, and Fig. 4 is FIG. 5 is a partial side view of a conventional example during movement. 1...Base machine, 1a...Movement mechanism, 2...
...Leader mast, 3...Casing, 4...Rotary erection device, 5...Hydraulic motor, 6...Reducer, 7
...Chuck device, 8...Support bracket, 9...
Lifting cylinder, 10...Drilling bucket, 11...
...Crane vehicle, 11a...Crane boom, 1
1b...Crane wire, 12...Reaction force frame, 13...Fixing jack, 14...Casing holder.

Claims (1)

[Claims] 1. A reaction frame with a short leader mast erected thereon is pivotally movable up and down to the front end of a base machine having a crane boom, and rotational or swinging force is transmitted to the leader mast to the casing for erecting it underground. A large-diameter pile hole drilling device characterized by a rotating and swinging erecting device attached so that it can move up and down.