| 摘要 |
Tunnel ventilation system providing a horizontal partition (1) divided into three separate ventilation ducts (4 and 5) with fire-resistant flaps which in an emergency hermetically close the ventilation ducts. Their position is controlled in dependence on measured parameters in the tunnel and whether or not there is fire in the tunnel and, if there is, the position of fire. Fans (3, 3a) are operated in dependence on conditions prevailing in the tunnel. An air screen (6a) prevents the influx of air in excess of the designed quantity from the environment into the tunnel. The system incorporates a tube-shaped tank (9) positioned longitudinally under the carriageway that contains air with reduced oxygen content in quantity sufficient for fire fighting. In the event of fire, air with reduced oxygen content is brought into the space of the tunnel's fire section. |
