Extension of Zurich northern bypass.

Project 

As part of the extension of the Zurich northern bypass, a 3rd tunnel tube is being constructed at Gubrist. This 3 km long tunnel increases the capacity to handle the growing traffic volume around Zurich and contributes to traffic safety.

It is an extraordinary project: There is no second tunnel in Switzerland with an excavation diameter of almost 16 metres. And the excavation and the inner lining is done in the direct proximity of the existing 2nd tube under service.

Technical data

• Construction of a 3rd tube with cross connections to the existing 2nd tube
• Construction of an operation and ventilation center at portal Affoltern
• Construction of an operation and ventilation center at portal Weiningen
• Construction of an underground operating centre

Costs

CHF 565'000’000

Timeline

2014 - 2022

Clients

Federal Roads Office ASTRA/FEDRO, Winterthur (ZH)

Services

• Site supervision SIA phases 52 and 53