JPH047500A - Tunnel ventilation method in tunnel work - Google Patents

Abstract

PURPOSE:To make it possible to perform proper air-delivery and exhaust by radiating laser light across a space in a tunnel, sensing damped light of the laser light, and controlling airflow of a contra fan commensurate with air- pollution in the tunnel. CONSTITUTION:A laser light source 7 and a light sensor 9 are arranged to a facing side, and the laser light source 7 is placed in the vicinity of a facing 6. After hat, laser light is radiated across an air polluted space in the tunnel from the laser light source 7, and it is reflected to a mirror 8. Then, damped light of the laser light is sensed by the light sensor 9. The airflow of the contrafan 13 is controlled by an airflow control panel 10 based on the damped laser light. According to the constitution, air-delivery and exhaust commensurate with the air-pollution can be surely made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for ventilating a mine in tunnel construction, which appropriately ventilates the air inside the mine contaminated with dust, exhaust gas, etc.

[Conventional technology]

Conventionally, to ventilate a mine during tunnel construction, etc., a gas sensor 1 and a dust sensor 2 are placed near the face of the mine, as shown in Figures 3 and 4, and the gas sensor 1 detects exhaust gas and dust. Each sensor 2 measures the concentration of dust, and based on the measured value, the contrafan 3 is inverter controlled by the inverter control panel 4 shown in FIG. 3 or the ventilation control panel 5 shown in FIG. Air supply and exhaust are controlled.

However, in the conventional method described above, the concentration of exhaust gas and dust is measured at a certain point based on the arrangement of gas sensor 1 and dust sensor 2. There is a problem that the amount of air supplied and exhausted is insufficient due to the inability to perform air exhaust and air exhaust, and the fan is usually operated at maximum air volume, which increases fan drive power consumption and is uneconomical. There's a problem.

[Problem to be solved by the invention]

The present invention has been made in order to solve the above-mentioned conventional problems, and provides a method for ventilating underground mines in tunnel construction, which can completely capture dirt in the air inside the mines and perform appropriate air supply and exhaust. The problem to be solved is to do so.

7kuku□ [Means for solving the problem] As a means for solving the above problem, the underground ventilation method for tunnel construction of the present invention uses a laser light source to
A laser beam is irradiated across the space in the mine where the air is contaminated, and a light intensity sensor detects the attenuated intensity of the laser beam.
The feature is that the amount of air blown or the amount of exhaust air from the contrafan is controlled thereby.

〔Example〕

An example of ventilation work when performing tunnel construction by applying the method of the present invention will be described below with reference to the drawings. It is configured as follows.

That is, a predetermined distance H from the face 6 in FIG.
= A laser light source 7 is placed on the face side of the movable support for lining concrete or a waterproof sheet work frame located approximately 200 to 300 m away, and a mirror 8 for reflecting laser light is placed near the face 6. Furthermore, a light amount sensor 9 is arranged on the face side of the movable support for lining concrete and the waterproof sheet work frame.

Next, connect the light quantity sensor 9 and the air volume control panel 10 with the cable 11.
, and then from the air volume control panel 10 to the fan control panel 1.
2 to the contrafan 13.

Therefore, to explain the procedure for performing ventilation using the underground ventilation method of the present invention using each device arranged as described above, laser light in the direction of the arrow is irradiated from the laser light source 7 across the space where the air inside the mine is contaminated, and the mirror The amount of laser light reflected by the laser beam 8 and attenuated by the light amount sensor 9 is detected, and based on the detected amount, the air amount of the contrafan 13 is controlled by the air amount control panel 10.

As shown in FIG. 2, in the mine 18 there is a contrafan 13A for air supply and a wind pipe 1 having the configuration shown in FIG.
1 system of air supply device A including 4A, etc., and 1 system of contrafan 13B for exhaust, and 1 system of 2 systems of displacement wB including interpipe 14B etc. are arranged between the face 6 and the outside mine 15. However, a movable support 19 for concrete lining is provided in the mine 18 in the figure.

Note that it is also possible to place the light amount sensor 9 at the position of the mirror 8 without placing the mirror 8, but in this case, the laser beam! Since the attenuation of the airflow is smaller than when the mirror 8 is provided, it may be difficult to control the air volume, so the mirror 8 is provided in the above embodiment.

〔Effect of the invention〕

According to the tunnel ventilation method for tunnel construction of the present invention described above, since the pollution of the air inside the mine is measured by the degree of attenuation of laser light, air supply and exhaust can be reliably performed in accordance with the air pollution. There is an effect.

Furthermore, since the air supply and exhaust air volumes during ventilation can be controlled to appropriate air volumes, the electric power used to drive the contrafan can be saved, resulting in an economical effect.

[Brief explanation of drawings]

Figure 1 is a layout diagram of ventilation equipment when tunnel construction is carried out using the method of the present invention, and Figure 2 shows the arrangement of ventilation equipment used in tunnel construction using the method of the present invention.
A schematic side view of the mine where the system is arranged and the supply and exhaust inside the mine is carried out;
FIGS. 3 and 4 are schematic layout diagrams illustrating different conventional ventilation methods, respectively. 6... Face, 7... Laser light source, 8... Mirror 9... Light amount sensor, 10... Air volume control panel, 13.1
3A, 13B...Contra Juan! ...Laser light, H...predetermined distance.

Claims (1)

[Claims] A ventilation method for tunnel construction in which a laser beam is irradiated across a space where the air inside the mine is contaminated, and the air volume of a contrafan is controlled by the attenuated intensity of the laser beam.