Civil Engineering Reference
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extinguishing system works automatically: when the nozzle is removed, the
pumps start and the system reaches an active pressure. When an emer-
gency post is opened this is signalled in the control room, then the camera,
which is directed towards the relevant tunnel section, automatically zooms
in. The tilting outwards of a fire hose reel, the removal of a powder extin-
guisher and the depressing of the activating button in the emergency posts,
are treated as a fire alarm. Water from the fire hoses is mixed with a foam-
forming agent so that, aside from normal fires, fuel fires can also be extin-
guished. All areas in the tunnel and the controlling building are provided
with a fire detection system.
Cross connections
In cases of disaster, the cross connections serve as an escape route for road
users to the other tube and as an access for the emergency services. The
Fig. 4.9
The access door to a
cross connection
Fig. 4.10
The interior of a cross
connection
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