Silvaplana bypass and tunnel.
The Julierstrasse connects the valley of Oberhalbstein with the Engadin. The "Silvaplana bypass" has relieved Silvaplana of the transit traffic. The overall length of this by-pass road is about 1.5 km. A central component of the project is the Silvaplana tunnel which is approx. 720 m long. It is built as a multi-lane road tunnel with two lanes each for oncoming traffic, including safety tunnels, 2 escape tunnels, underground operations centre and 2 underground ventilation plants.
Most of the tunnels and galleries were excavated by blasting in rock of good quality (granite). In the entrance areas, in soft rock, machine-assisted excavation was applied. During construction, the consortium supported the client in the technical site management.
CHF 50.0 Mio.
Design: 2010 - 2014
Execution: 2014 - 2018
Technical office Canton Grisons, Coira (CH)