JPH112084A - Excavating mechanism of vertical shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavating mechanism having a small overall height by using a fixing means for fixing the excavating mechanism to a casing in such a manner as to be attachable and detachable, and alternately performing the process of screwing the casing and the excavating process to dispense with an earth drill. SOLUTION: A hydraulic cylinder 5 is set as a fixing means 4, oil is supplied thereto to displace an arm 6, and a pressing body 7 is protruded to the inner wall 11 of a casing 2 to fix an excavating mechanism 1 to the casing 2. The fluid pressure equipment of a driving means 9 is arranged adjacently to a rotating excavating means 8. In screwing process, the fixation of the excavating mechanism 1 to the casing 2 is released, and the casing 2 is screwed into the ground by use of a rotating screwing device 3. In excavating process, the excavating mechanism 1 is fixed to the casing 2, oil is supplied to the driving means 9 to rotate the rotating excavating means 8, and it is also advanced by an advancing cylinder 13. The screwing process and the excavating process are alternately performed. Thus, an earth drill is dispensed with, and the overall height can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digging mechanism for digging a shaft such as driving a foundation pile.

[0002]

2. Description of the Related Art Conventionally, a shaft excavation mechanism has been used for excavating a shaft such as driving a foundation pile.

[0003] As shown in FIG. 4, when a shaft is excavated, a rotary excavating means 22 is driven by a motor 21 of an earth drill 20.
While rotating the shaft of the screw (shown in the figure), the shaft is pressed into the ground and excavated. Reference numeral 23 denotes a casing for preventing earth and sand from collapsing on the wall of the shaft.

However, since the earth drill 20 is required to rotate the shaft of the rotary excavating means 22, the total height becomes very high by the height of the earth drill,
There was a problem that work could not be performed in places with height restrictions such as under bridges.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
An object of the present invention is to provide a shaft excavation mechanism capable of lowering the overall height than before.

[0006]

In order to solve the above-mentioned problems, the present invention employs the following technical means.

A shaft excavation mechanism according to the present invention is a mechanism for excavating a shaft in a casing for preventing collapse of earth and sand, and a fixing means for detachably fixing the shaft to the casing. A rotary digging means for digging into the ground and a driving means for driving the rotary digging means are provided, and the driving means is arranged close to the rotary digging means.

[0008] The excavation mechanism of this shaft is fixed to a casing for preventing collapse of earth and sand by fixing means,
By the driving means arranged close to the rotary excavation means,
No earth drill is required to drive the rotary digging means, as the rotary digging means can be driven into the ground.

[0009] The driving means may be a fluid pressure device, and the rotary excavating means may be a drilling bucket.

[0010]

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

As shown in FIGS. 1 to 3, a shaft excavation mechanism 1 of this embodiment is a mechanism for excavating a shaft in a metal casing 2 for preventing collapse of earth and sand. In addition, the casing 2 is forcibly driven to rotate downward from the outer peripheral side by using a known rotary screwing device 3 so that the casing 2 can be screwed into the ground.

A fixing means 4 for detachably fixing the excavation mechanism 1 of the shaft to the casing 2.
(Four pairs of hydraulic cylinders 5, arms 6, and pressing bodies 7) and rotary excavating means 8 (drilling and
Bucket) and driving means 9 (hydraulic motor) for driving the rotary excavating means 8 (drilling bucket)
And

[0013] Four pairs of hydraulic cylinders 5 are installed at 90-degree intervals as fixing means 4, and when oil is supplied from the ground through a hydraulic control box 10 by a pressure-resistant hose (not shown) via a crane by a known method. , Four pairs of hydraulic cylinders 5
The output shaft of each arm is extended and connected to each of the two rows of arms 6.
Are rotated about 45 degrees in the outer peripheral direction and displaced, so that the pressing body 7 is completely fixed by projecting against the inner wall 11 of the casing 2 (shown by a two-dot chain line).

The drilling buckets employed as the rotary excavating means 8 take in the shavings from the shaft. A screw blade 12 is provided at the tip of the drilling bucket.

The hydraulic equipment (hydraulic motor) employed as the driving means 9 is disposed in close proximity to the rotary excavating means 8 (drilling bucket), and oil is supplied from the ground via a crane by a pressure-resistant hose by a known method. The oil is supplied through the hydraulic control box 10. The hydraulic motor drives the drilling bucket to rotate.
Also, a hydraulic cylinder 13 for excavation is provided to excavate the rotary driven drilling bucket into the ground. Similarly, by supplying hydraulic pressure and driving the drilling bucket 13, the part of the drilling bucket is moved to the casing 2 and the like. It is possible to proceed relatively downward.

Next, the use state of the shaft excavation mechanism 1 of this embodiment will be described. The step of screwing the casing 2 into the ground by the rotary screwing device 3 and the step of excavating the excavation mechanism 1 by integrally fixing the excavation mechanism 1 of the shaft to the casing 2 by the fixing means 4 are alternately performed. ing.

In the step of screwing the casing 2 into the ground,
The rotary screwing device 3 is used to forcibly rotate downward from the outer peripheral side and screw into the ground. In this step, the excavation mechanism 1 of the shaft is released from being fixed to the casing 2, and the excavation mechanism 1 of the shaft is suspended in the air by a crane. Therefore, during this screwing process,
The casing 2 and the shaft excavation mechanism 1 are separated from each other.

In the underground excavation process, the excavation mechanism 1 of the shaft is moved into the casing 2 by a crane, and oil is transferred from the ground via a crane to a hydraulic control box by a pressure-resistant hose.
The hydraulic cylinder 5 is supplied through 10. Then, the output shaft of the hydraulic cylinder 5 is extended, and the four pairs of arms 6 connected thereto are displaced in the outer peripheral direction, respectively, and are completely fixed to the inner wall 11 of the casing 2. That is, the excavation mechanism 1 of the shaft is fixed to the casing 2.

Then, oil is supplied from a crane to a driving means 9 (hydraulic motor) disposed in close proximity to the rotary excavating means 8 (drilling bucket) via a hydraulic control box 10 so that the rotary excavating means 8 is driven. (Drilling bucket) is rotated and driven downward by the excavating hydraulic cylinder 13 to excavate into the ground.

According to the shaft excavating mechanism 1, an earth drill is not required to drive the rotary excavating means 8 (drilling bucket). Therefore, there is only a crane that suspends the excavating mechanism 1 of the shaft, and there is an advantage that the overall height can be made lower than before.

As shown in FIG. 4, a casing 23 for preventing the collapse of earth and sand on the wall of the shaft is conventionally screwed into the ground by an earth drill 20.

[0022]

The present invention is configured as described above and has the following effects.

Since the earth drill is not required to drive the rotary excavating means, it is possible to provide a rotary excavating mechanism capable of reducing the overall height as compared with the conventional one.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a shaft excavation mechanism of the present invention.

FIG. 2 is an explanatory diagram of a cross-sectional structure taken along line AA of a shaft excavation mechanism of FIG. 1;

FIG. 3 is an explanatory view of a structure of a section of the shaft excavation mechanism of FIG. 1 taken along line BB.

FIG. 4 is an explanatory view of a conventional shaft excavation mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavation mechanism of shaft 2 Casing 4 Fixing means 8 Rotating excavation means 9 Driving means

Claims (3)

[Claims] 1. A mechanism for excavating a shaft in a casing for preventing collapse of earth and sand, a fixing means for detachably fixing the shaft to the casing, and a rotation for excavating into the ground. An excavation mechanism for a shaft, comprising: excavation means; and drive means for driving the rotary excavation means, wherein the drive means is disposed in proximity to the rotary excavation means. 2. The excavation mechanism of a shaft according to claim 1, wherein said driving means is a hydraulic device. 3. A shaft excavation mechanism according to claim 1, wherein said rotary excavation means is a drilling bucket.