JPH11132000A - Ventilation-station facility for road tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an air duct for smoke exhaust corresponding to the time of emergency (a fine generation, etc., in a main tunnel) at low civil-engineering cost while using a ventilation-station facility for a road tunnel adopting an electrostatic precipitator as the dust removal means of ventilation air an object. SOLUTION: An electrostatic precipitator 9, into which a damper 9c is incorporated, is installed to a ventilation air duct 3 as the dust removal means of ventilation air sucked from the main tunnel 1 of the tunnel while a smoke-removal damper 13 is juxtaposed and arranged to a residual space by utilizing the residual space between the electrostatic precipitator 9 and the ventilation air duct 3. The electrostatic precipitator 9 is operated under the state, in which the smoke-removal damper 13 is closed at the normal time, the electrostatic precipitator 9 is shut down at the time of emergency when a fire is generated in the tunnel and the damper 9c is closed while the smoke-exhaust damper 13 is opened, and smoke filled into the tunnel through the smoke-exhaust damper 13 is discharged to the outside of the tunnel through an air blower and a ventilation tower at post stages. Accordingly, the excavation construction works of an exclusive smoke-exhaust air duct bypassing the electric dust collector are made unnecessary apart from the ventilation air duct 3, and civil-engineering construction cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilating facility for a road tunnel for discharging air sucked from a main tunnel through a dust removing means and a blower into the atmosphere.

[0002]

2. Description of the Related Art In a tunnel of a long motorway that passes through the mountainous area, the underground of an urban area, or the like, a ventilating facility is constructed in the middle of the tunnel in order to improve the field of view in the tunnel, and vehicle exhaust gas is emitted from the tunnel. Air polluted by soot and floating dust in the tunnel is discharged to the ground to ventilate the tunnel main shaft. Also, in this case, if the ventilation air discharged to the ground side is dirty, it may cause air pollution to the surrounding environment. To release into the atmosphere outside the tunnel.

[0003] Fig. 2 shows a configuration of a conventional ventilation station facility for an automobile road tunnel. In the figure, 1 is a tunnel main shaft in which a car 2 runs, 3 is a ventilation air passage branched from the main shaft 1, 4 is a ventilation station, and the ventilation station 4 is connected to the ventilation air passage 3 and protrudes to the ground. The structure is a combination of a ventilation tower (chimney) 5, a ventilation blower 6, a dust filter 7, and the like. Reference numeral 8 denotes auxiliary equipment installed in the building of the ventilation station 4.

[0004] With such a configuration, the air that is normally drawn from the tunnel main shaft 1 (the air in the tunnel is contaminated with the exhaust gas, dust and the like of the automobile 2) is removed by the dust filter 7.
And then discharged from the ventilation tower 5 through the blower 6 into the air above the ground. In the above-mentioned ventilation station 4, the dust filter 7 is removed from the operating position in an emergency when a fire occurs in the tunnel main shaft due to an automobile collision accident or the like. This is because a large amount of smoke fills the tunnel during a fire,
If you continue to use the dust removal filter as it is, the filter will be clogged and damaged by a large amount of soot adhering, and in addition to the smoke exhaust air volume dropping extremely,
While the dust filter is functioning, the amount of smoke (black smoke) discharged from the ventilation tower on the ground is reduced, which may delay the visual notice of abnormalities in the tunnel from the ground side. It is.

[0005]

In recent years, the problem of air pollution prevention has become increasingly important from the viewpoint of environmental protection, while the efficiency of dust removal by the above-mentioned filter is limited. Therefore, the use of an electric precipitator with high dust removal efficiency as a means of dust removal for ventilation tunnel facilities in road tunnels has been studied. Newly constructed road tunnels and existing roads have been studied. A plan to install an electric precipitator as a means of removing ventilation equipment in accordance with the tunnel renovation work plan has been embodied.

By the way, even if the dust filter of the ventilation station equipment is replaced with an electric dust collector, as in the case of the filter dust removal method, it is necessary to take measures for smoke emission in the event of a fire in the tunnel main pit. Become. That is, if the electric dust collector is continuously operated even in the event of a fire, a large amount of dust flows through the electric dust collector, which may cause a spark discharge in the charging unit and the dust collecting unit and cause a failure. As in the case of the filter, the space between the electrodes of the dust collecting section is clogged, and the amount of air flow is extremely reduced.Furthermore, as in the case of the conventional filter, while the electric precipitator is functioning, the ventilation tower is used. There is a possibility that the occurrence of abnormalities in the tunnel cannot be visually confirmed from the ground side due to the small amount of smoke exhausted.

[0007] Therefore, when installing the electric precipitator in the ventilation station equipment, as shown in FIG. 3, as an emergency countermeasure, the electric precipitator 9 is installed so as to bypass the electric precipitator 9 installed in the ventilation air passage 3. A plan has been proposed in which a flue gas passage 10 for bypass is constructed outside the air passage 3 and smoke flue dampers 11 and 12 are provided on the inflow side and the outflow side, respectively. In the illustrated example, in order to suppress the expansion of the building space of the ventilation station 4, the electric precipitator 9 is installed in the air passage of the ventilation air passage 3 away from the building, and the electric precipitator 9 and the ventilation air passage 3 are connected to each other. Space (especially ventilation air duct 3 with electric dust collector 9 installed)
On the ceiling side, an extra space is provided for installing a dust collector and a hoist for taking out the dust collector). An electric precipitator may be installed inside the building.

With such a configuration, the smoke exhaust dampers 11, 1 are normally used.
The electric precipitator 9 is operated in a state in which the ventilator 2 is closed, and the air sucked from the tunnel main shaft 1 is passed through the electric precipitator 9 as shown by an arrow A to purify the ventilation air, and then passed through the ventilation tower 5. Released into the ground. On the other hand, in an emergency (when a fire occurs in the main tunnel), the operation of the electric precipitator 9 is stopped, and the inlet and outlet dampers incorporated in the main body of the precipitator are closed. Flue gas damper 1
The smoke blown out of the main tunnel 1 is opened by opening the smoke exhaust passage 10 as indicated by an arrow B, and the smoke is discharged from the ventilation tower 5 to the atmosphere above the ground via the blower 6 at the subsequent stage to exhaust the smoke. To do.

However, in the above configuration, when constructing the ventilation station equipment, civil works for excavating the smoke exhaust air path 10 in addition to the exhaust air path 3 are required, which increases the construction cost of the ventilation station equipment. become. The present invention has been made in view of the above points, and is intended for a ventilation facility of a road tunnel that employs an electric precipitator as a means for removing ventilation air. It is an object of the present invention to provide a ventilation facility for a road tunnel capable of securing an air passage for smoke discharge in response to the occurrence of a fire.

[0010]

According to the present invention, in order to achieve the above-mentioned object, a ventilation air passage branching from a main tunnel and leading to the atmosphere outside the tunnel is provided with dust removing means and a ventilation blower. In a ventilation facility of a road tunnel that removes air sucked from a tunnel main shaft and discharges the air into the atmosphere, an electric precipitator with a damper function is installed in the ventilation air duct as the above-mentioned dust removing means, and the electric precipitator is installed. A smoke exhaust damper is installed in the ventilation duct in parallel with the dust collector, the electric dust collector is operated with the smoke exhaust damper closed at all times, and the electric dust collector is operated in an emergency when a fire occurs in the tunnel Stopping and closing the damper, opening the smoke exhaust damper, and exhausting the smoke filled in the tunnel to the outside of the tunnel through the smoke exhaust damper (Claim 1). Dust machine and ventilation Using the residual space between the road here to install the flue gas damper (claim 2).

[0011] According to this configuration, in order to secure an emergency smoke exhaust passage, there is no need for civil engineering work for excavating another smoke exhaust passage that bypasses the electric dust collector outside the ventilation air passage.
Emergency smoke can be exhausted through the smoke exhaust damper installed here by using the remaining space of the ventilation air duct, and the construction cost of ventilation equipment can be reduced accordingly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the embodiment shown in FIG. In the drawings of the embodiment, the same members corresponding to FIG. 3 are denoted by the same reference numerals. 1 (a) and 1 (b), an electric precipitator 9 is stacked and installed on the exhaust air passage 3 in the upper and lower stages, and the electric precipitator 9 on the upper side and the ceiling of the ventilation air passage 3 are connected to each other. A smoke exhaust damper 13 that opens and closes the damper blades 13a by electric or pneumatic operation using a remaining space left therebetween is provided here. As is well known, the electric precipitator 9 includes a damper that is electrically or pneumatically opened and closed at the inlet and outlet sides of the main body case in addition to the charging section 9a and the dust collecting section 9b in the main body case (housing). 9c is equipped. This damper 9c
Normally, the dust collector is opened when the dust collector is in operation.
Closed when the dust collected in step b is washed with water and washed away, and used to prevent the dust from being scattered out of the dust collector with the spray of the washing water. The remaining space generated on the side of the electrostatic precipitator 9 is closed by a shielding plate 10, and an inspection door through which an operator comes and goes during maintenance is provided.

With such a configuration, the electric dust collector 9 is normally operated with the smoke exhaust damper 13 closed, and the ventilation air (arrow A) sucked from the tunnel main shaft 1 flows to the electric dust collector 9 for purification. After that, the downstream blower and ventilation tower (Fig. 2, Fig. 3
(See Reference). On the other hand, in the event of a fire in the tunnel main shaft 1, the operation of the electric precipitator 9 is immediately stopped based on the alarm signal detected by the fire alarm of the tunnel main shaft, and the inflow side and the discharge side are operated. And the smoke exhaust damper 13 is opened. As a result, the smoke blown out from the tunnel main shaft 1 into the ventilation air passage 3 flows through the smoke exhaust damper 13 as indicated by the arrow B, and is exhausted from the ventilation tower via the downstream blower.

Incidentally, the above-described configuration can of course be implemented similarly when the electric precipitator 9 is installed in the building of the ventilation station 4 shown in FIG. 3, and in this case, separately from the ventilation wind path. Since it is not necessary to secure a flue gas path, it is not necessary to expand the space of the ventilation station building.

[0015]

As described above, according to the present invention,
An electric precipitator with a damper function is installed in the ventilation air duct as a means to remove ventilation air, and smoke exhaust dampers are juxtaposed here using the remaining space between the dust precipitator and the ventilation air duct. Normally, the electric dust collector is operated with the smoke exhaust damper closed, and in an emergency when a fire occurs in the tunnel, the electric dust collector is stopped and the damper is closed, and the smoke exhaust damper is opened. Since the smoke filled in the tunnel is exhausted to the outside of the tunnel through the smoke exhaust damper, as a measure against smoke exhaustion in the event of a fire in the tunnel, electric dust is collected from the ventilation duct. There is no need to provide a separate flue duct to bypass the machine, which saves the cost of excavation work and the construction of a ventilation center building for the construction of road tunnel ventilation facilities.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a main part configuration diagram of a ventilating facility according to an embodiment of the present invention, (a) is a cross-sectional view of an installation location of an electric precipitator along a ventilation air passage, Arrow XX sectional view

FIG. 2 is a cross-sectional view showing the configuration of a conventional road tunnel ventilating facility employing a filter as a means for removing air from ventilation.

FIG. 3 is a cross-sectional view of the configuration of a road tunnel ventilation station facility according to a conventional example in which an electric precipitator is used as a means for removing air from ventilation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel main shaft 3 Ventilation airway 4 Ventilation station 5 Blower 6 Ventilation tower 9 Electric precipitator 9c Damper 13 Smoke exhaust damper 13a Damper blade

Claims (2)

[Claims] 1. A ventilation air passage branching from a tunnel main tunnel and leading to the atmosphere outside the tunnel is provided with a dust removing means and a ventilation blower, which removes air taken from the tunnel main tunnel and discharges the air into the atmosphere. In a ventilation facility of a road tunnel, an electric precipitator with a damper function is installed in the ventilating air duct as the dust removing means, and a smoke exhaust damper is provided in the ventilating air duct in parallel with the electric precipitator. Operates the electric precipitator with the smoke exhaust damper closed, stops the electric precipitator in the event of a fire in the tunnel, closes the damper, opens the smoke exhaust damper, A ventilation facility for a road tunnel, wherein smoke filled in the tunnel is discharged outside the tunnel through a smoke damper. 2. The ventilation system for a road tunnel according to claim 1, wherein a smoke exhaust damper is installed in the remaining space between the electric precipitator and the ventilation duct. Facilities.