JP3302282B2 - How to prevent the fall of Mt. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing collapse of a cutting face ground which can surely hold down the ground near the cutting face and further improve the safety at the time of charging and installing a supporting material.

[0002]

2. Description of the Related Art Excavated objects in tunnel construction are:
There are very many types, such as clay, silt, sand, gravel, soft rock and hard rock, and the properties change significantly depending on the degree of compaction of soil particles and the state of containing water.

[0003] Apart from hard rock that is not likely to collapse, in drilling work for collapsible geology, after drilling work with a heavy drilling machine such as a drill jumbo, blasting charges and support materials near the face are cut off. Since human labor is required at the time of installation work, it is necessary to prevent collapse of the mountain face above it and to ensure the safety of workers.

[0004] As a method of preventing the collapse, hitherto, the fall was prevented by pressing a pressing iron plate attached to the end of the boom of the heavy equipment against the face immediately above the working position to press the face.

[0005]

However, this fall prevention method has the following drawbacks.

(1) While the face of the cutting face has an uneven shape, the pressing iron plate is flat, so that the face of the face cannot be pressed evenly, and the earth and sand easily collapse from the gap with the iron plate. .

(2) Heavy equipment is required to prevent face collapse, and large heavy equipment is congested in a narrow tunnel.
Work efficiency decreases. For example, after drilling with a drill jumbo, it is necessary to replace the heavy equipment such as retreating the drill jumbo and moving the heavy equipment for working at heights, and this work takes considerable time and labor. was there.

(3) Since the holding iron plate is heavy and has a large shape, it is troublesome to replace and remove the heavy machine for working at height from the end of the boom.

The object of the present invention is to solve the above-mentioned problems. An object of the present invention is to provide a lightweight and easy-to-handle method, which can press even a face having a large unevenness with a uniform pressure. The present invention also provides a method for preventing collapse of a cutting face mountain which further improves the safety of work at a lower portion thereof.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention relates to a mangage attached to a boom tip of a heavy excavator for ground excavation, and a mancage attached to the tip end of the mancage prior to blast preparation work. And a mantle cage approaching an appropriate position on the face in accordance with the extension and angle adjustment of the boom, and then the face resting body presser. By pumping the fluid, expand it and press it along the uneven shape of the face,
It is characterized by supporting the face. Also the
The invention of 2 is attached to the end of the boom of the heavy machine for excavating ground.
Man cage and flexible located at the tip of the man cage
And a holding face body made of a bag.
Cut the man cage according to the extension and angle adjustment of the
Approach the appropriate position on the wing surface, and then press on the face
The fluid is pumped to expand the fluid, and the unevenness of the face
Pressing along the shape to support the face immediately above the worker
It is characterized by the following.

Therefore, according to the present invention, after drilling work,
By approaching the man cage attached to the heavy equipment to the corresponding collapse prevention point and applying fluid pressure to the face
The presser body expands unevenly along the shape, and presses the face face without gaps by the fluid pressure, so that it is possible to surely prevent collapse.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a tolyl jumbo 1 to which the method of the present invention is applied. The drill jumbo 1 includes a self-propelled vehicle body 2, one or a plurality of drilling drillers 3 provided at the tip of the vehicle body 2 as a hole drilling device for drilling a face, and The vehicle includes one or a plurality of booms 4 which are supported so as to be able to swing up and down and which can expand and contract, and a man cage 5 which is horizontally arranged at the tip of each boom 4.

The man cage 5 is a place where a worker A for monitoring the work is arranged at the time of drilling, and the safety of the worker A is secured by surrounding the deck plate with a handrail 6.

On the front side of the handrail 6, a ground holding body 8 made of a flexible bag is disposed on the front surface of the handrail 6 via a protective plate or a storage box 7. As shown by a solid line in the figure, the ground holding body 8 is normally arranged in a contracted state on the front surface of the protective plate 7 and is connected to an unillustrated pneumatic (oil) pressure hose. By applying a fluid pressure such as air pressure or hydraulic pressure to the inside of the holding member 8, as shown in the imaginary line in FIG. 1 and in an enlarged manner in FIG.
In this state, the rear side expansion is restricted, so that the front side and the upper and lower sides are expanded.

In FIG. 1, a face 1 of a tunnel 10 is shown.
1 shows a state in which the drilling 11a by the drilling drifter 3 with respect to No. 1 has been completed and the drifter 3 has been retracted to the standby position. In this state, the work for packing the blasting charge into the drilling hole 11a is performed. The work procedure is shown.

First, the inspection worker A gets on the man cage 5 of the boom 4 at the standby position, and then extends the boom 4 while raising it to a required angle, thereby removing the man cage 5 from the hole 1.
It is brought close to the vicinity of the face 11 which is the position directly above 1a. The worker A inspects the wall surface, and if it is determined to be a dangerous place, the boom 4 is fixed at that position.

Subsequently, the hose valve is opened by the instruction of the worker A or the hand of the worker A, and a fluid pressure is applied to the holding body 8, so that the holding body 8 in the contracted state is moved to the front side as shown in each figure. And expands up and down, closely adheres to the uneven surface of the face 11, and presses the face 11 tightly with a pressing force corresponding to the fluid pressure.
Safety is ensured.

After the safety immediately above the drill hole 11a is confirmed by the above operation, the blasting worker B sends the corresponding drill hole 11a.
To perform the blast preparation work such as loading the blast charge.

After completion of the blasting preparation work, after confirming that the worker B has retreated to the retracted position, the fluid of the presser body 8 is extracted and contracted, the boom 4 is retracted to the standby position, and the drill jumbo itself is also retracted to the retracted position. By retracting, blasting work can be performed.

Since not only the blast preparation work but also the installation and assembling of the support material near the face is performed by the operator, the work of supporting the face 11 by the pressing body 8 is performed immediately above the installation position. It can be performed while safety is ensured.

In the above embodiment, the case where the worker A gets on the man cage 5 of the boom 4 is exemplified. However, the charging operation can be performed by remote control without the worker A getting on the man cage 5. Of course.

[0023]

As is apparent from the above description, in the method for preventing the fall of the cutting face mountain according to the present invention, after drilling, the man cage attached to the heavy equipment is brought close to the corresponding fall prevention point. By applying fluid pressure to the cutting face mountain holding body, the holding body expands unevenly along the shape, and the fluid pressure can press the face face without gaps. There is no gap, and the safety of the worker directly under the gap can be further improved. In addition, since the face face can be pressed using a man cage provided on a heavy machine such as a drill jumbo for drilling, safety assurance work can be performed immediately after the excavation work, so that there is no replacement of the heavy machine and congestion associated therewith. , Work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of a drill jumbo to which the method of the present invention is applied.

FIG. 2 is a partially enlarged view showing a safety assurance operation using a man cage of the drill jumbo.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drill jumbo (heavy machinery for drilling) 4 Boom 5 Man cage 8 Ground holding body 10 Tunnel 11 Face face

────────────────────────────────────────────────── (5) References JP-A-55-119900 (JP, A) JP-A-58-24031 (JP, A) JP-A-4-82096 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) E21D 9/04 E21D 9/00 E02D 17/04 E21B 7/02

Claims (2)

(57) [Claims] Before the blasting preparation work, a man cage attached to the end of a boom of a heavy excavator for ground excavation and a cutting face holding body made of a flexible bag disposed at the end of the man cage are provided. In accordance with the extension and angle adjustment of the boom, the man cage is brought close to an appropriate position on the face, and then a fluid is pressure-fed to the face ground holding body to expand the fluid, and the uneven shape of the face is obtained. A method for preventing collapse of a mountain face face, comprising pressing against the face face along the face. 2. A ground excavator attached to a boom tip of a heavy machine.
Man cage with flexible
Face holding body made of a plastic bag body,
Extend the man cage according to the boom extension and angle adjustment.
Approach the appropriate position on the face, and then press on the face
By pumping the fluid through the body, it expands and the concave face
Pressing along the convex shape to support the face immediately above the worker
A method for preventing the fall of a mountain face, characterized by the following.