881 Meter long road tunnel
53 Million CHF
The tunnel will be excavated mainly in the downward direction using blasting and excavation methods, with the complete calotte being driven from east to west and the bench and invert excavated subsequently, in reverse to the calotte drive.
The tunnel is sealed watertight all around and receives a reinforced, up to 90cm thick inner vault made of PP fiber-reinforced concrete.
Special feature: The rock in the mining tunnel is partly geogenically contaminated with asbestos. Therefore, the excavation was carried out under full respiratory protection (blower-assisted filter devices with helmet) as well as extensive technical protective measures.