Civil Engineering Reference
In-Depth Information
ventilation also ensures that the air pollution in the tunnel tube does not
exceed the permissible level when traffic stands still. During a fire, the lon-
gitudinal ventilation system is capable of discharging the released smoke
and fumes in a controlled manner in the desired direction.
The tunnel ventilation is activated or de-activated automatically on the basis
of CO measurements and visibility readings in the tunnel tubes.The jet-fans
then always blow the air in the driving direction.
Jet-fan in the tunnel
Fig. 15.6
Automatic activation during a fire
The operator can control the ventilation
from his control desk, in which a reversal of the ventilation direction is also
possible.
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