JP3505561B2 - Road tunnel ventilation station equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation facility for a road tunnel that discharges air sucked from a main tunnel through a dust removing means and a blower into the atmosphere. 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 to improve the field of view in the tunnel main tunnel. Air polluted with soot from automobile exhaust gas and airborne dust in the tunnel is released to the ground to ventilate the main tunnel. In this case, if the ventilation air discharged to the ground side is dirty, it will cause air pollution to the surrounding environment. To release it into the atmosphere outside the tunnel. [0003] Fig. 2 shows a configuration of a conventional ventilation center facility for an automobile road tunnel. In the figure, reference numeral 1 denotes a tunnel main shaft in which a car 2 travels, 3 denotes a ventilation air passage branched from the main shaft 1, 4 denotes a ventilation station, and the ventilation station 4 is connected to the ventilation air passage 3 and protrudes to the ground. The configuration 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 sucked from the tunnel main shaft 1 (the air in the tunnel is contaminated with the exhaust gas and dust 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. Also, in the above-mentioned ventilating 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 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 more and more important in terms 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 of road tunnels has been studied. A plan to install an electric precipitator as a means of removing ventilator equipment has been embodied in accordance with the existing road tunnel repair work plan. 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 system, it is necessary to take measures for smoke emission in the event of a fire in the main tunnel. Become. In other words, when 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. 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 discharged. Therefore, when installing the electric precipitator in the ventilating equipment, as shown in FIG. 3, ventilation is performed so as to bypass the electric precipitator 9 installed in the ventilation duct 3 as an emergency measure. 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 duct of the ventilation air duct 3 away from the building, and the electric precipitator 9 and the ventilation air duct 3 are connected to each other. Space (especially ventilation air duct 3 with electric precipitator 9 installed)
On the ceiling side, an extra space for installing a dust collector and a hoist for taking out the dust collector is secured by a shielding plate 13. 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 main tunnel 1 is passed through the electric precipitator 9 as shown by an arrow A to purify the ventilation air. 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 from 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, and the construction cost of the ventilation station equipment increases accordingly. become. The present invention has been made in view of the above points, and is intended for a ventilation facility of a road tunnel employing 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 a fire or the like. According to the present invention, in order to attain the above object, a dust removing means and a ventilation device are provided in a ventilation air passage branched from a main tunnel and leading to the atmosphere outside the tunnel. In a ventilation facility of a road tunnel that has a blower and removes the air sucked from the main tunnel and discharges it to the atmosphere, an electric precipitator with a damper function is installed in the ventilation air duct as a dust removal means. Install a smoke exhaust damper in the remaining space between the dust collector and the ceiling of the ventilation duct, always operate the electric dust collector with the smoke exhaust damper closed, and in the event of a fire in the tunnel, The operation of the electric precipitator was stopped, the damper of the electric precipitator was closed, the smoke exhaust damper was opened, and the smoke filled in the tunnel was exhausted out of the tunnel through the smoke exhaust damper. [0011] According to this configuration, in order to secure an emergency smoke exhaust passage, there is no need for civil engineering work to dig 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 the ventilation equipment can be reduced accordingly. 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. In FIGS. 1 (a) and 1 (b), an electric precipitator 9 is stacked and installed in the exhaust air passage 3 in the upper and lower stages, and the electric precipitator 9 in the upper stage and the ceiling of the ventilation air passage 3 are connected. 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 has 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 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 workers come and go 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 main tunnel 1 is passed through 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 occurring 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. Is closed, and the smoke exhaust damper 13 is opened. As a result, the smoke blown out from the main tunnel 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. [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 for dust removal of 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 emission 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 excavation costs for building road tunnel ventilation facilities and construction costs for ventilator buildings.

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 position of an electric precipitator along a ventilation wind path, (b) ) Is a sectional view taken along the line XX in FIG. 2A. [FIG. 2] A sectional view of the configuration of a conventional road tunnel ventilation facility employing a filter as a means for removing ventilation air. [FIG. 3] A means for removing ventilation air. Cross-sectional view of the construction of road tunnel ventilation station equipment according to a conventional drafting example adopting an electric dust collector [Description of reference numerals] 1 Tunnel main shaft 3 Ventilation airway 4 Ventilation station 5 Blower 6 Ventilation tower 9 Electric dust collector 9c Damper 13 Smoke exhaust damper 13a Damper wing

Claims (1)

(57) [Claims] [Claim 1] A ventilation air passage branched from a tunnel main tunnel and leading to the atmosphere outside the tunnel is provided with a dust removing means and a ventilation blower, and air sucked from the tunnel main tunnel is provided. In a ventilation facility of a road tunnel that removes dust and discharges it to the atmosphere, an electric precipitator with a damper function is installed in the ventilation duct as a dust removal means, and between the electric precipitator and the ceiling of the ventilation duct. Smoke exhaust dampers are installed in the remaining remaining space, and the electric dust collector is operated with the smoke exhaust damper closed at all times, and in the event of a fire in the tunnel, the electric dust collector is stopped and the electric dust collector is stopped. A ventilating facility for a road tunnel, wherein a damper of the machine is closed, a smoke exhaust damper is opened, and smoke filled in the tunnel is exhausted outside the tunnel through the smoke exhaust damper.