JP3148142B2 - Prevention device for fall of mountain face - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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.

Conventionally, as a method for preventing the collapse, a collapse prevention device composed of a presser iron plate attached to the end of a boom of a heavy machine such as an aerial work vehicle is pressed against the face immediately above the working position to press the face. I was

However, this fall prevention device has the following problems.

(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 or the like,
It is necessary to replace the heavy equipment such as retreating the drill jumbo and advancing the heavy equipment for working at a high place, and this work requires a considerable amount of time and effort.

(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.

[0010] Therefore, the present applicant has devised to develop an air bag type collapse prevention device using a flexible bag as an alternative to the iron plate collapse prevention device. That is,
The reason for this is that the air bag is inflated while being in close contact with the surface of the face by the injection of pressurized air by injecting pressurized air, so that the face of the face can be pressed evenly, and that the face is lightweight and easy to handle.

The air bag has been put into practical use as a shock absorbing device at the time of a recent collision of a passenger car, and its structure is such that a gas is generated in a folded air bag by detecting an impact, and this gas is generated. It has a function to rapidly inflate the airbag by pressure and attenuate the acceleration applied to the human body.

However, this air bag is disposable, and in order to be practically used as a collapse prevention device, pressurized air is discharged and discharged by an air compressor or the like.
It is necessary to have a configuration in which expansion and contraction are repeated.

[0013]

However, in the case of this air bag type collapsing prevention device, it is good to inflate it. However, even if the air is evacuated, the remaining air does not completely fold it, so When returning to the stored state, the folding operation is required while bleeding the air manually, and there is a problem that the number of steps required for storage is increased.

Although it is possible to return to the stored state by completely evacuating the air by vacuum suction, in this case, a vacuum suction device is required in addition to the air compressor, which complicates the device configuration. .

The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to inflate and store an air bag from a storage box only by an operation of supplying and discharging air by switching a solenoid valve. Provided is a device for preventing collapse of a face mountain, and a device for preventing collapse of a face mountain which is lightweight, easy to handle, and can be pressed with even pressure even on a face surface having significant unevenness. Is provided.

[0016]

Means for Solving the Problems In order to achieve the above object, the present invention according to claim 1 of the present invention provides a storage box having a front opening, a storage box which is stored in the storage box, and which is formed along the unevenness of the face. An air bag made of a flexible bag body that can be inflated, an air hose connected to an air inlet of the air bag through a first solenoid valve, and for sending air from the air compressor side, and an air bag. An air discharge pipe connected to a discharge port via a second electromagnetic valve, and a negative pressure generating nozzle branched from the air hose and depressurizing the inside of the air discharge pipe through a third electromagnetic valve at the distal end side. A discharge air nozzle connected thereto, and when the air bag is inflated, air is injected into the air bag by opening only the first solenoid valve to inflate the air bag, and when the air bag is retracted, the first solenoid valve is inflated. To Flip, second, by opening the third solenoid valve, the inside of the air bag causes open to the atmosphere,
It is characterized in that the inside of the airbag is depressurized and contracted by a suction action to the atmosphere side by the negative pressure generating nozzle. Therefore, according to the present invention, the airbag can be inflated and contracted by switching the respective solenoid valves.

According to a second aspect of the present invention, in the first aspect of the present invention, the airbag according to the first aspect is a front surface of a bellows fixed to an inner rear portion of the storage box so as to be able to expand and contract toward the front surface. It is characterized by being integrated in an airtight state. Therefore, in the present invention, the bellows retracts to the back of the storage box due to the negative pressure at the time of contraction, so that the airbag can be completely stored in the storage box.

In the invention according to a third aspect of the present invention, the storage box and the airbag housed in the storage box are arranged at a tip of a man cage provided at a tip of a boom of a heavy excavator for ground excavation. It is characterized by the following.
Therefore, in the invention according to claim 3, after the drilling operation by the heavy equipment is completed, the work for ensuring the safety of the upper part of the face face can be immediately performed by using the air bag, and there is no congestion of the work due to the replacement of the heavy equipment, and the work efficiency is reduced. Can be improved.

[0019]

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

FIG. 1 shows a drill jumbo 1 provided with the apparatus of the present invention. 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 work monitoring is provided at the time of drilling, and the safety of the worker A is secured by surrounding the deck plate with a handrail 6.

A storage box 7 having a front opening is provided at the front of the handrail 6, and an air bag 8 made of a flexible bag is disposed inside the storage box 7.

The air bag 8 is stored in a contracted state inside the storage box 7 and is connected to an air hose described later. By applying air pressure to the inside of the holding body 8 through this hose, the air bag 8 shown in FIG. As indicated by the imaginary line, the airbag 8 is inflated and protrudes from the front of the storage box 7 and presses it along the uneven shape of the face face 11 in the tunnel 10 facing the storage box 7 to prevent collapse.

FIGS. 2 (a), 2 (b) and 2 (c) show a specific configuration of the airbag 8 and a device for operating the airbag. In the figure, an airbag 8 is integrated with a front surface of a bellows 12 that is extendably arranged on the inner surface of a storage box 7, and an inlet 13 is provided on the back surface and the lower surface of the bellows 12.
And an outlet 14 is opened.

The inlet 13 has one end connected to the air compressor 1.
5 is connected to the air hose 16 via a first solenoid valve 17 and a pressure reducing valve 18.

The outlet 14 is connected via a second solenoid valve 19 to a discharge pipe 20 opened to the atmosphere. Further, on the upstream side of the first solenoid valve 17, a discharge air hose 21 is branched and piped to the air hose 16, and this air hose 21 is connected to the third solenoid valve 2.
2 is connected to a negative pressure generating nozzle 23 disposed inside the discharge pipe 20.

Each of these solenoid valves 17, 19, 22 is (a)
As shown in (a), when the airbag 8 is in the retracted state, the solenoid valves 17, 19, and 22 are closed, and the inside of the airbag 8 is in a negative pressure state, as shown in FIG. And stored in the storage box 7 with the bellows 12 contracted.

In order to inflate the air bag 8 from this state, as shown in FIG.
While holding the first and second solenoid valves 17 and 22 in a normal state, the bellows 12 protrudes, and the air bag 8
Expands and presses it while deforming along the uneven shape of the face 11.

Next, the air bag 8 is removed from the inflated state.
Is stored again, the first solenoid valve 17 is closed and the second and third solenoid valves 19 and 22 are opened, as shown in FIG. At the same time as the air is released to the atmosphere, the inside of the discharge pipe 20 and the inside of the air bag 8 are further reduced in pressure by the jet flow blown out from the nozzle 23, and the bellows 12 and the air bag 8 are sucked flat by the decompression effect, and again. It will be stored in the storage box 7. After the storage, the stored state is maintained by closing the second and third solenoid valves 19 and 22 again as shown in FIG.

In FIG. 1, a drilling hole 11a is formed on the face face 11 of the tunnel 10 by the drilling drifter 3.
Is completed, and the drifter 3 is retracted to the standby position, and the operation procedure for performing the operation of filling the explosive charge into the borehole 11a in this state is illustrated.

First, the inspection worker A rides on the man cage 5 of the boom 4 at the standby position, extends the boom 4 while raising it to a required angle, and moves the man cage 5 to the position of the face 11 directly above the hole 11a. Move closer to the vicinity. 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.

Next, the operator A operates the solenoid valve controller 24 to apply air pressure to the air bag 8, so that the presser body 8 in the contracted state protrudes from the storage box 7 and expands, and the unevenness of the face 11. And presses the face 11 tightly with a pressing force corresponding to the air pressure without gap to prevent the face 11 from collapsing and to secure the safety of the face 11.

After the safety is confirmed just above the drilling hole 11a by the above operation, the blasting worker B moves to the position of the corresponding drilling hole 1a and performs blasting preparation work such as loading the blasting charge. it can.

After the blast preparation work is completed, the worker B confirms the retreat to the retracted position, operates the solenoid valve controller 24 again to store the airbag 8 in the storage box 7, and then moves the boom 4 to the standby position. And return to drill jumbo 1
The blasting operation can be performed by retreating itself to the retracted position.

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 airbag 8 is performed immediately above the installation position. It can be performed while safety is ensured.

[0036]

As is apparent from the above description, in the device for preventing collapse of the cutting face mountain according to the present invention, since the air bag is used as the device for preventing collapse, the handling is simple and the vacuum pump or the like is used. The air bag can be inflated and contracted only by the switching operation of each solenoid valve without the need for the device described above, and the operation at the time of storage is also simplified. Furthermore, by adopting the invention of claim 2, the air bag comes into and out of the storage box, so that the operation at the time of storage can be performed automatically.

Further, as described in the third aspect of the present invention, the fall prevention device of the present invention is attached to the tip of a mancage for monitoring the operation of a heavy equipment for drilling such as a drill jumbo.
There is an advantage that there is no replacement or congestion of heavy equipment for ensuring safety, and safety can be secured immediately after drilling.

[Brief description of the drawings]

FIG. 1 is a side view of a drill jumbo to which a collapse prevention device according to the present invention is applied.

FIGS. 2A to 2C are explanatory diagrams showing an airbag storage state, an inflated state, and a re-storage state in the device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drill jumbo (heavy machine for drilling) 4 boom 5 mancage 7 storage box 8 air bag 10 tunnel 11 face face 12 bellows 15 air compressor 16 air pipe 17, 19, 21 solenoid valve 18 pressure reducing valve 20 discharge pipe 21 discharge air pipe 23 Negative pressure generating nozzle

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-B-61-44200 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/00 E21D 9/04

Claims (3)

(57) [Claims] An air bag comprising a storage box having a front opening, a flexible bag stored in the storage box, and inflatable along irregularities on a face of the storage box, and a first air inlet provided in the air bag. An air hose that is connected through an electromagnetic valve and that sends air from the air compressor side, an air discharge pipe that is connected to a discharge port of an air bag through a second electromagnetic valve, and branches from the air hose. A discharge air nozzle connected to a negative pressure generating nozzle for reducing the pressure in the air discharge pipe via a third solenoid valve at the front end side, and only the first solenoid valve is opened when the air bag is inflated. By injecting air into the air bag, inflating it, closing the first solenoid valve and opening the second and third solenoid valves at the time of deflation and storage, releasing the inside of the air bag to the atmosphere. Let Both collapse preventing device of the working face natural ground, characterized in that for vacuum shrink the air bag by the suction action of the air side by the negative pressure producing nozzle. 2. The airbag according to claim 1, wherein the airbag is airtightly integrated with a front surface of a bellows fixed to the inside of the storage box so as to extend and contract toward the front surface. A device for preventing fall of a face face mountain according to the above. 3. The storage box according to claim 1, wherein the storage box and the airbag accommodated in the storage box are disposed at a tip end of a man cage provided at a tip end of a boom of a heavy excavator for ground excavation. The fall prevention device of the face face mountain described in the above.