Safety Tunnel N13, Viamala
New Construction of Safety Tunnel with 5 Cross-Connections
The new 660-m-long safety tunnel was constructed with 4 cross-connections at regular intervals to the existing tunnel operated in the direction of oncoming traffic. Close to the western tunnel portal, the safety tunnel crosses the traffic tunnel Viamala with only 3.70 m cover.
• Drilling and blasting in the rock with descending tunneling at a gradient of up to 8.7%
• A tunnel = 18.7 m², A cross connections = 15.4 m²
• Challenging geology with isoclinally folded, scaly, obducted and slightly metamorphic sediments, rock cover approx. 220 m
Project period: 2010 - 2017
Services: Project author construction/BSA for all phases, site supervision