JPS6187100A - Dust removing apparatus in tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a device for preventing the dispersion of dust generated in a tunnel and removing the dust, and more specifically, the invention relates to a device that partitions the inside of the tunnel with a foam membrane layer and has a face part. This invention relates to a dust removal device in a tunnel that efficiently eliminates and eliminates generated dust.

(Prior technology) During tunnel excavation construction, the face is blasted and concrete is sprayed instead of steel shoring or sheet piles. A large amount of dust is generated in so-called shotcrete. The concentration of this dust inside the tunnel must be controlled below a certain level from the standpoint of occupational safety and health and work environment management. Therefore, in tunnel excavation work, a m collector is installed and operated directly inside the tunnel. Moreover, in order to increase the dust collection efficiency of dust collectors, methods are used to keep the airflow in the mine stationary using air curtains or water curtains. However, the former method does not require installing a dust collector directly near the face in a tunnel with a small cross section.
If a dust collector is installed, it will interfere with excavation work.

On the other hand, the method of using air curtains or water curtains to stop the underground airflow simply partitions the mine with an air film or atomized film, so the airflow generated by the jet of air or water spreads the dust, reducing the dust collection effect itself. let Furthermore, since the water curtain turns water into a mist and flows down from the top into the tunnel, the tunnel becomes humid, which worsens the working environment and makes it difficult to see inside the tunnel, which hinders the operation of the tunnel. Moreover, a dedicated water treatment system must be installed to prevent the underground roadbed from turning into mud due to exposure to water.

(Object of the Invention) Therefore, the present invention provides a dust removal device that improves the drawbacks of the conventional oil dust removal method described above and efficiently removes oil dust without spreading the dust generated in a tunnel. be.

(Summary of the Invention and Examples) Hereinafter, a device for removing dust in a tunnel according to the present invention will be explained in detail based on the drawings.

In FIG. 1, a tunnel 1 is formed by excavating a ground G from a mine entrance 11 to a face 12. A foamed membrane layer 2 is formed inside the tunnel 1 to partition the tunnel into a tunnel 1 and a face 14, respectively.

As shown in the explanatory front view of the tunnel in FIG. 2, an arc-shaped pipe 21 having approximately the same diameter as the arch portion of the tunnel I is fixed with rock poles 22, 22, etc. Rockpol) 2
2, 22, . . . are provided in advance in the arch of the tunnel 1 at required intervals in a direction substantially perpendicular to the tunnel axis. The pipe 21 is gripped by gripping portions provided at the tips of the lock bolts 22, 22.... Next, a net 23 having a required mesh is suspended from the pipe 21. This net 23 may be formed of a single sheet of netting, or may be formed of a plurality of netted sheets. In either case, any structure may be used as long as the mesh of the net 23 is covered with the foaming agent to form a foamed film. Also, a plurality of lifting ropes 24, 24... are provided in the vertical direction at required positions of the net 23, and when the operating rope 25 continuous with the lifting ropes 24, 24... is pulled up, the lower end of the net 23 is pulled up by the lifting rope. It is pulled upward through 24°24...

On the other hand, an appropriate number of nozzles n are provided on the lower surface of the pipe 21.

are in communication with each other, and the foaming agent fed under pressure by a pressure hose connected to the pipe 21 is ejected from the nozzles n, n... and adheres to the net 23 directly below, forming a foam membrane 26.
The foamed membrane 26 gradually moves downward to cover the entire mesh of the net 23 to form the foamed membrane layer 2.

Next, a case will be described in which shotcrete is constructed inside the tunnel 1 using the dust removal device of the present invention.

As shown in the explanatory schematic diagram of FIG. 1, a net 23 is suspended within the tunnel 1 to form a face side space 14.

Then, with the net 23 pulled up by the operating rope 25, the spraying device 3, which is one of the tunnel inner wall treatment equipment, is carried into the face side space 14. Next, the operating rope 25 is loosened, the net 23 is lowered, and the tunnel 1 is partitioned off by the net 23. In such a state, an excavation jumbo consisting of an excavation device 4, a foaming device 5, and a dust collector 6 is placed in the wellhead side space 13. The foaming device 5 includes a foaming machine 51 and a pressure pump 5
The pressure pump 52 is connected to the pipe 21 via a pressure hose 53. Further, the dust collector 6 communicates a suction port 61 opened to the face side space 14 with a suction duct 62, and causes dust-containing air to be sucked into a blower 64 by a 4Sl+ flow fan 63.

In such an excavation jumbo, first, the foaming machine 51 is driven and the foaming agent is forced into the pipe 21 by the pressure pump 52 via the pressure hose 53. The foaming agent in the pipe 21 is ejected from the nozzles n, n, . . . and flows down to adhere to the net 23, forming the foamed film layer 2 as described above. The foaming agent is mainly composed of a surfactant, and is selected to have the amount of bubbles, duration of foaming, and viscosity depending on the construction time of the shotcrete.

When the foam film 26 is formed on the net 23 as described above, the tunnel +! A foam membrane layer 2 is formed perpendicular to 41+, and 9
The J wing side space 14 is partitioned off by one foam membrane layer 2.

Next, the spray device 3 is remotely controlled by an operating machine (not shown) provided in the tunnel entrance side space 13, and the arch section 1 inside the tunnel is
Spray concrete on each side. At this time, a large amount of dust is generated, but since it is partitioned by the foam membrane layer 2, the dust remains in the face side chamber 114. Moreover, since no airflow is generated in the face side space 14 and dust is adhered to the surface of the foamed membrane layer 2 by the adsorption force of the surfactant, the dust is not diffused.

Therefore, when the axial fan 63 of the dust collector 6 is driven, dust-containing air is sucked in from the suction port 61 and introduced into the dew blower 64 via the suction duct 62. The frost blower 64 passes the introduced dust-containing atmosphere through the frost blower, causes the dust to fall into a receiving tank, and discharges it to the outside as clean air.

In addition, when controlling the spraying device 3 remotely, it is necessary to check the movement and blowing position of the spraying device 3, and a required number of inspection windows 27, 27, . . . are provided in the foamed membrane layer 2. The inspection windows 27, 27, . . . are made of transparent vinyl and are integrally formed with the net 23.

When concrete spraying work is completed in the face side space 14 and dust removal is also completed, the net 23 is pulled up using the operating rope 25 to communicate the tunnel mouth side space 13 and the face side space 14, and the blowing device 3 is turned on. At the same time, the excavation jumbo is placed on the face 12 and the next process of excavation work is started. After a predetermined distance has been excavated, the inner wall of the tunnel is again sprayed with concrete, and the dust is removed in the same manner as described above.

As the excavation progresses, the face side space 14 becomes larger and the dust collection volume also becomes larger. Therefore, the foamed membrane layer 2 is sequentially advanced as the excavation progresses. That is, the pipe 21 is reattached to the rock poles (22, 22, etc.) provided in the advanced position, and the net 23 is suspended. A so-called net 23 is moved parallel to the excavation direction. Thereafter, the foamed membrane layer 2 is formed as described above.

In the above explanation, the net 23 is set in advance in the tunnel l.
The tunnel inner wall treatment equipment is carried into the face side space 14 by lifting the net 23 with the operating rope 25, or in the present invention, the tunnel inner wall treatment equipment is placed on the face surface 12 in advance and the lock bolts 22. The pipe 21 may be attached via... and the net 23 may be suspended.

In any case, after placing the tunnel inner wall treatment equipment in the face side space 14, the foaming device 5 is driven and the net 23
It is sufficient if the foam film 26 is formed on the surface of the foam film layer 2 to form the foam film layer 2 on the entire surface.

(Effects) As explained above, the device for removing dust in a tunnel according to the present invention forms a foamed membrane layer in the tunnel to partition the space on the face side and the tunnel mouth side, so that dust is removed in the so-called face side space where dust is generated. No dust flow is generated, and dust-containing gas can be efficiently discharged from the space on the side of the mine entrance. Further, since dust is directly attached to the surface of the foamed membrane mainly composed of a surfactant, an efficient dust collection effect is exhibited in both cases. In addition, since a foam membrane layer is formed and partitioned by the operating rope, it is extremely easy to enter and exit the excavation equipment δ and tunnel inner wall processing equipment, and the construction efficiency is not reduced. It is a removal device.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating the dust removal device of the present invention, and FIG. 2 is a front view of a tunnel. l...tunnel, 11...wellhead, 12...
・Face. 13... Space on the tunnel mouth side, 14... Space on the face side. 2... Foamed membrane layer, 21... Pipe. 22.22...Rock bolt, 23...Net. 24... Pulling rope, 25... Operation rope. 26... Foam membrane, 27... Inspection window. 3...Tunnel inner wall treatment equipment. 4...Drilling equipment, 5...Foaming equipment. 51... Foaming machine, 6... Dust collector.

Claims (1)

[Claims] 1. In a device for removing dust generated in a tunnel,
A device for removing dust in a tunnel, characterized in that a net is hung perpendicular to the tunnel axis, and a foamed membrane layer is formed on the net to partition the tunnel into a space on the face side and on the tunnel entrance side. 2. Tunnel inner wall treatment equipment is provided in the space on the face side, and a dust discharge device, excavation equipment, and foaming device are provided in the space on the tunnel entrance side. Dust removal equipment inside the tunnel. 3. The foamed membrane layer is formed by forcing a foaming agent foamed by a foaming device into a pipe provided at the upper end of the net via a pressure feeding hose, and spraying it between the meshes of the net using a nozzle provided in the pipe. A dust removal device in a tunnel according to claim 1, characterized in that: 4. The device for removing dust in a tunnel as set forth in claim 1, wherein the foam membrane layer is configured to communicate the space on the face side and the space on the tunnel entrance side by pulling up the lower end of the net with an operating rope. 5. The dust removal device in a tunnel as set forth in claim 1, wherein inspection windows are provided at required locations on the foamed membrane layer.