Civil Engineering Reference
In-Depth Information
Fig. 4.11
Fire brigade drill in the
tunnel
Fig. 4.12
Fire brigade drill in
Switzerland
escape route is clearly marked. The accesses from the tunnel tubes to the
cross connections are provided with fire-retarding smoke-resistant doors. In
the cross connections, the ventilation system ensures there is a slight excess
pressure so that no gases or smoke can enter. The clean air is inducted from
the other tunnel tube where there is no disaster. Every cross connection has
an intercom system.
The maintenance personnel can make use of a (locked) escape route from the
plant rooms under the road surface to the tunnel tube.This hatch in the road-
side is unlocked only after the tunnel tube/driving lane has been cleared.
To be able to ensure that the emergency services can reach the tunnel
quickly, separate service roads have been provided to the access ramps.
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