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New
tunnel section type once finished.
Offices
and refuge situated in the South portal of tunnel.
Scale
model view of ventilation center in South portal. |
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New
tunnel
General
characteristics
Safety
General characteristics
The new tunnel has the following characteristics:
Length: 5224 ms
Three lanes 3,5 m wide.
Specific speed: 80 km/h
Circulation type: Bidirectional
Maximum slope: 4,57 % from the high point to the North portal; the
slopes in the South part are of 0,62 % until the kilometer pint
0+480 and 1.68 % until the high point.
Minimum vertical high: 5,29 m
Circulation width: 12 m (in 3 lanes of 3,50 m)
Two sidewalks of 1,0 m width.
Cross section camber: 2% towards the East side, except in North
exit that will be of 4%.
Total
section: 127 m2 of excavation, with an overall complete section of 95 m2,
and a road section of 78 m2.
The road surface is
concrete to avoid contaminations in fire case.
Safety
One of the most important theme in the project of the new
Vielha tunnel will be the safety.
The old
tunnel will be reserved for the vehicles with dangerous transports.
Also the tunnel will be a evacuation way for people in incidents in
the new tunnel.
As main
elements of safety the tunnel included:
Evacuation
galleries (cross passages) connected to the present tunnel
(each 400 m, 12 in total). Each cross passages have a 12 m
long refuge adjacent to the new tunnel.
Safety niche and fire points (each 200 m, 25 in
total)
The tunnel will be enlarged at 550 m centres to provide
eight 30 m long emergency breakdown bays, 3.5 wide .
Semi-transverse ventilation system.
Water network against
fires Red throughout the tunnel.
Traffic
lights, barriers in tunnel portals. Emergence telephones.
Television
cameras (CCTV), telephony network inside the tunnel.
Fire detection system.
Automatic detection system (DAI).
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All the
technical management will be centralized and controlled form a new
control center, that will be located in the North portal of tunnel.
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