JP2015034385A - Ventilation air outlet instrument for tunnel construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a parallel flow type air curtain by providing an air outlet near a working face when a tunnel is constructed.SOLUTION: An air feeding duct 1 is arranged in a substantially central position in the transverse direction of the upper side of a tunnel pit so as to extend from a pit mouth of the tunnel pit to a working face direction. An air duct which is laterally substantially symmetrical in transverse cross section (hereinafter referred to as "air curtain forming air duct 5") is extended at a terminal part of the air feeding duct, and has upper direction air outlets 2 and lower direction air outlets 3. When an air blower for supplying air is operated, fresh air from outside the tunnel pit is sucked from an inlet into the air feeding duct 1, and is blown out nearly evenly from the upper direction air outlets 2 and lower direction air outlets 3 through the air curtain forming air duct 5 provided at the terminal part of the air feeding duct 1, thus allowing an air curtain to be formed.

Description

The present invention is an air outlet that forms an air curtain having a substantially parallel flow in a short section of a tunnel attached to the tip of a wind pipe. A slit-shaped air outlet that blows out toward the upper and lower parts of the tunnel is provided to form a parallel flow air curtain.

In conventional tunnel construction, excavation work is performed near the face, and a large amount of dust is generated. If dust spreads throughout the tunnel, the working environment will deteriorate and the health of workers will be impaired. Therefore, it is very important to properly plan the ventilation.

As means for solving this problem, there is a method of forming an air curtain by blowing air supply air in a tunnel cross-sectional direction (see, for example, Patent Document 1).
By using this air curtain system, there is a possibility that dust may be contained near the face.
In this blower outlet, it blows out circularly from the upper part of the center of a tunnel cross section, and blows off radially in the transverse direction in a tunnel mine. In the tunnel mine, an air layer that divides the mine space into the front side and the rear side in the face direction is formed.

JP 2004-339780 A

However, since the air outlet is located at the upper part of the center of the tunnel cross section, the air flow is diffused at the end portion of the air flow and the effect of the air curtain is weakened.
In particular, the lower portion of the tunnel cross-section is difficult to reach the air flow, and the dust in the lower portion cannot be contained, leaks, and the dust may diffuse throughout the tunnel.

The present invention has been made in order to solve the above-described problems, and by providing an outlet near the face during tunnel construction, a parallel flow air curtain is formed with respect to the short section of the tunnel. The problem is to propose this.

The invention according to claim 1 is a ventilation method for ventilating the inside of a tunnel mine during a tunnel mine cutting work, wherein the air supply wind pipe is at a substantially central position in the transverse direction on the upper side in the tunnel mine, Arranged so as to extend in the face direction from the tunnel anti-wellhead, extend a wind pipe that is substantially symmetrical with a short cross-section at the end portion of the air supply wind pipe, and blow out in the vertical direction of the wind pipe By using the air pipe for air supply, fresh air absorbed from the outside of the tunnel tunnel is blown up and down from the substantially symmetrical wind pipe to form an up and down parallel flow air curtain. This is a blowout device characterized by that.

The invention according to claim 2 is a blowout device characterized in that an enlarged portion from the end portion of the air supply wind tube to the wind tube that is substantially symmetrical in a short cross section has a streamlined shape. is there.

The invention according to claim 3 is characterized in that an air volume distribution guide is disposed in the inside of the enlarged portion of the air pipe that extends from the end portion of the air supply wind pipe to the wind pipe that is substantially symmetrical in the lateral cross section. To do.

The invention according to claim 1 prevents the dust around the face from diffusing throughout the tunnel by forming a parallel flow air curtain in the vertical direction of the short section of the tunnel, and the working environment is deteriorated. It can prevent harming your health.

The invention according to claim 2 is made smooth so as not to disturb the air flow from the wind tube by streamlining the enlarged portion from the end portion of the air supply wind tube to the wind tube that is substantially symmetrical to the short cross section. Thus, resistance to the airflow can be prevented.

According to the third aspect of the present invention, by arranging the air volume distribution guide, an unbalanced air volume can be blown out from the air outlet, forming an even air curtain, and making the air curtain air flow as far away as possible. The air curtain effect can be exerted more by being able to reach.

It is a shape figure of the blower outlet apparatus installed in the tunnel mine which concerns on embodiment of this invention. It is a top view in the tunnel mine which concerns on embodiment of this invention. It is a short sectional view in a tunnel mine according to an embodiment of the present invention. It is a longitudinal cross-sectional view in the tunnel mine which concerns on embodiment of this invention.

In this embodiment, an embodiment of a ventilation device in a tunnel mine and a ventilation device used therefor will be described with reference to the drawings.
FIGS. 1-4 shows forming the air curtain by the ventilator installed in the tunnel mine which concerns during cutting construction.
The air supply wind pipe 1 is arranged so as to extend in the direction of the face from the entrance of the tunnel mine at a substantially central position in the transverse direction on the upper side in the tunnel mine, and has a short cross section at the end portion of the air supply wind pipe A wind pipe (hereinafter referred to as an air curtain forming wind pipe 5) that is substantially symmetrical to the left and right is extended to an upper air outlet 2 and a lower air outlet 3 of the air pipe.

An air supply blower (not shown) that blows the sucked fresh air to the air curtain forming wind tube 5 is connected to the air supply wind tube 1.
By operating the air supply blower, fresh air from the outside of the tunnel is sucked into the air supply wind pipe 1 from the inlet and is provided at the end portion of the air supply wind pipe 1. Air curtains can be formed by being blown out from the upper direction outlet 2 and the lower direction outlet 3 through the curtain forming wind pipe 5 substantially evenly.

FIG. 1 is a perspective view of the shape of the air outlet.
The air blower is operated, and the fresh air blown is sent from the upper direction outlet 2 and the lower direction outlet 3 along the air curtain forming wind pipe 5 which is streamlined through the air feeding wind pipe 1. Fresh air is blown out.

In FIG. 2, the shape of the outlet is described on a plane.
By disposing the air volume distribution guide 4 inside the air curtain forming wind pipe 5, a uniform air volume can be blown out from the air outlet.

FIG. 3 shows a short section of the tunnel. A pattern in which a parallel flow air curtain is formed in the vertical direction from the air curtain forming wind pipe 5 is shown.

FIG. 4 describes a tunnel longitudinal section.
Dust around the face can be prevented from diffusing throughout the tunnel by the air curtain.

DESCRIPTION OF SYMBOLS 1 Air supply pipe 2 Upper direction blower outlet 3 Lower direction blower outlet 4 Air volume distribution guide 5 Air curtain formation wind pipe

Claims (3)

A ventilation method for ventilating the inside of a tunnel mine during cutting work of a tunnel mine, wherein the air supply wind pipe is located at a substantially central position in the transverse direction on the upper side in the tunnel mine, from the tunnel pit entrance to the face direction. The air supply wind pipe is disposed so as to extend, and a wind pipe that is substantially symmetrical with respect to a short cross-section is extended to a terminal portion of the air supply wind pipe, and an outlet is provided in the vertical direction of the wind pipe. Using a pipe, the fresh air absorbed from outside the tunnel mine is blown up and down from the substantially symmetric wind pipe to form a parallel flow air curtain in the vertical direction of the short section of the tunnel. Air outlet equipment. The blowout device according to claim 1, wherein the enlarged portion from the end portion of the air supply wind tube to the wind tube that is substantially symmetrical to the short cross section has a streamlined shape. 3. An air volume distribution guide is arranged inside an enlarged portion of the wind pipe extending from a distal end portion of the air supply wind pipe to a wind pipe that is substantially symmetrical with respect to a short cross section. Outlet equipment.

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