JPS63265100A - Method and device for cleaning air 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 [Field of Industrial Application] The present invention relates to a method for cleaning air in a tunnel and a cleaning device used for the purpose. , Spraying relates to an air cleaning method and a cleaning device for improving the working environment inside a tunnel by separating the area with an air curtain when the air is contaminated by concrete dust, etc.

[Conventional technology] To improve and maintain the working environment inside the tunnel.

Traditionally, fresh air is taken in from outside the mine or from the mine entrance for ventilation. However, as contaminated air diffuses into the mine, similar equipment is required for exhaust. However, scattered dust is difficult to capture and cleaning is not sufficient.

On the other hand, air curtains are installed at the openings of buildings to prevent the flow of conditioned air from heating and cooling systems at entrances and exits.
There is an example of applying this technology to tunnels,
In the invention of No. 18495, an air supply duct is provided on a frame spanning the entire cross section of the tunnel, and an air curtain is formed downward by the air flow jetted out from a large number of air outlets, blocking the face side and trapping contaminated air. , it is known that contaminated air is discharged from the exhaust duct.

[Problems to be solved by the invention] The ventilation system according to the prior art requires mechanical equipment and a large amount of power for sending and exhausting, and when the cross section of the tunnel is not very large, the efficiency of sending and exhausting is good, but when both pipes are It gets in the way of the working space inside the mine.

Furthermore, forming an air curtain requires a large frame, making it difficult to accommodate any cross section, and also requires supply and exhaust pipes. Contamination of the air inside tunnels is not limited to dust caused by excavation, but gas ejections must also be taken into consideration. There is also a strong demand for cleaning methods and cleaning devices that can handle such situations.

[Means for Solving the Problems] The present invention was developed with the aim of solving the problems in view of the above-mentioned current situation, and it involves forming an air curtain by a completely new means. The air blowing from the air pipe is blown perpendicularly to the tunnel wall and collides with it, and the counterflowing airflow forms an air curtain within the tunnel cross section, and extracts contaminated air commensurate with the amount of air supplied. This invention is characterized by employing a dust collector, guiding contaminated air to the intake pipe of the dust collector, and supplying the cleaned exhaust air from the dust collector to the air curtain. A cleaning device used in such a cleaning method is mainly composed of a dust collector.

[Work] The operation of the present invention will be explained in detail based on the drawings.

FIG. 1 is a sectional view taken in a direction perpendicular to the axis near the face of the tunnel, in which 1 is the tunnel, 2 is its wall surface, 3 is an air pipe, 4 is an air flow jetting out from the tip 31 of the air pipe 3,
5 is an air flow flowing counter-currently from the wall surface 2. Now, in this cross section S, the tip 31 of the air pipe 3 is directed toward the wall surface 2, and an effective countercurrent air flow 5 is generated from the air flow 4 by adjusting a suitable angle with respect to the circumferential direction of the wall surface. let The wall surface 2 is generally a rough surface, but experiments have shown that if the appropriate spray angle and jet speed are selected, the airflow can be controlled by the "Coanda effect".
The air flows counter-currently along the curved surface from the crown 21 to the earth flat 23 along the opposite side of the back 22, circulates to the invert 6, and an air curtain can be formed by the entire airflow. The circulating airflow within this cross section S allows the inside of the tunnel to be divided into a contaminated side and a clean side. Therefore, depending on the amount of air supplied, air from the contaminated side is removed from the exhaust pipe 7.
Ventilation is achieved by supplying and exhausting air.

Purification of the air within the tunnel is achieved. The cleaning method of the present invention is not limited to the face, but in the middle part of the tunnel,
It is clear that this method can also be applied to cases where noxious gas blows out from the ground by setting the cross section S to two sides.

In the second aspect of the present invention, the air supply pipe 3° and the exhaust pipe 7. A dust collector that is integrated with a filter, a drive unit, etc. is used, and the contaminated air is sucked in through the exhaust pipe (intake pipe) 7, the dust is filtered, and the clean exhaust air is supplied to the air supply pipe 3. The operation is similarly understood when used.

[Example] The air cleaning method of the present invention and the cleaning device of the second invention will be described in detail based on drawings showing examples. 2 is a cross-sectional view of the tunnel similar to that in FIG. 1, FIG. 3 is a vertical cross-sectional view in the axial direction along line A--A in FIG. 2, and FIG. 4 is a plan view. Reference numerals in FIG. 1 are common to corresponding parts. In the figure, 8 is a face of the tunnel, and 9 is a contaminated area filled with contaminated air in front of the face 8.

Reference numeral 10 denotes, for example, an electric dust collector, which is mounted on the loading platform of a transport vehicle T and has a cross section S that limits and blocks the contaminated area 9.
It is installed with the front section in the position of . 7 is dust collection 8
110, which corresponds to the exhaust pipe 7 related to the contaminated site. The exhaust pipe 3 of the dust collector 10 is folded back from the rear to the front of the filter F built in the dust collector 10, and
It is bent in a direction perpendicular to the axis of the tunnel, and corresponds to the above-mentioned air supply pipe 3, with the exhaust port at its tip 31 facing the wall surface 2. This tip portion 31 is configured to be able to pivot or be fixed relative to the axis of the exhaust pipe 3, and its pivot plane is set as a cross section S. In order to prevent the intake pipe 7 from short-circuiting with the exhaust port 31 of the exhaust pipe 3, it is preferable to install the intake lower 1 under the dust collector 10 to effectively form an air curtain due to the above-mentioned "Coanda effect".

When the dust collector 10 is operated, the air from the contaminated area 9 is sucked in through the intake pipe 7, and after filtering floating dust and gas with the filter F, the purified air is blown onto the wall surface 2 from the exhaust pipe 3, and is preferably An air curtain is formed at the position of cross section S according to the selected angle and air ejection speed. At this time, the angle of the air flow 4 with respect to the wall surface 2 is tilted upward from the perpendicular line so that the air flow due to the Coanda effect can reach a long distance along the wall surface. Further, a nozzle is formed at the exhaust port at the tip 31 of the exhaust pipe 3, and the speed of the air flow 4 and the distance to the wall surface are selected depending on the scale of the tunnel. In this way, an air curtain is formed inside the tunnel.
At that time, the balance of air remains constant during the work, and there is no need to supply air from outside the mine using a supply/exhaust pipe installed inside the mine, or to discharge it outside the mine, and dust from contaminated air is removed.
The air in the area is ventilated with clean air to achieve the purpose. Of course, as shown in FIG. 4, by using the duct D leading to the outside of the mine and supplying fresh air separately, ventilation is achieved as shown by the arrow, and the purpose can be achieved quickly.

[Effects of the Invention] Since the present invention is as detailed above, purification of contaminated air within a tunnel is effectively achieved through the presence of an air curtain, which effectively circulates air at required locations, particularly at the face, and is installed in a mine. No supply or exhaust pipes are required, and the work space is not obstructed.

Furthermore, the dust collector only needs to be large enough to be movable within the cross section of the tunnel, and there is no need to connect or separate pipes at all as construction progresses. Moreover, the length of the bent part of the exhaust pipe, the blowing speed,
All you need to do is adjust the amount of balloons. By mounting the dust collector on the transport vehicle, it is easy to evacuate for blasting work at the face. Overall, using the cleaning method and cleaning device of the present invention greatly improves the maintenance and management of the working environment inside the tunnel.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view of a tunnel illustrating the method of cleaning contaminated air in a tunnel according to the present invention, and FIGS. 2, 3, and 4 are cleaning methods based on embodiments. FIG. 2 is an explanatory diagram of a cleaning device. FIG. 2 is a sectional view of the tunnel face similar to FIG. 1, and FIG. 3 is a side view. FIG. 4 is a plan view of another example. 1... Tunnel, 2... Wall surface, 3... Air pipe, dust collector exhaust pipe, 4... Air flow, 5... Counterflow air flow,
6... Invert, 7... Exhaust pipe, intake pipe of dust collector, 8... Face, 9... Contaminated area, 10... Dust collector, 31... Tip of air pipe, exhaust port, 71 ...Intake port, S...Cross section, F...Filter, T...Transportation vehicle, D...Duct. Figure 1 1 Tunnel 2 Wall 6 Invert 3 Air pipe
7 Exhaust pipe 4 Air flow 31 Tip 5 Counterflow air'' A, S Cross section 2 Δ L.

Claims (3)

[Claims] (1) Guide the air supply pipe to the area where the air inside the tunnel is contaminated, and direct the tip of the pipe in a direction perpendicular to the axial direction of the tunnel to blow the air against the tunnel wall and cause it to flow counter-currently. 1. A method for cleaning air in a tunnel, which comprises forming an air curtain on the air curtain, and discharging air on the contaminated side of the blocking surface to the other side. (2) The air cleaning method according to claim 1, wherein the air supply pipe is an exhaust pipe of a dust collector installed in the tunnel, and the air is discharged through the intake pipe of the dust collector. (3) A dust collector that is movably installed in a tunnel and has an exhaust pipe and an intake pipe, and the exhaust pipe has an exhaust port at its tip that is oriented perpendicular to the axial direction of the tunnel. The air purifier in a tunnel is characterized in that the exhaust port is rotatable or fixed in a direction perpendicular to the axis of the tunnel, and the intake pipe has an intake port in the direction of the axis of the dust collector. Device.