A4/A20 Hafnerberg Tunnel, Birmensdorf

The Hafnerberg Tunnel forms part of the A4/A20 Zurich west bypass. It connects the Birmensdorf junction with Reppichstal. Each direction (Basel and Lucerne) has a separate tunnel bore with two driving lanes and a shoulder lane.

Main heading from Reppichstal with two access points. Drill and blast heading with emulsion explosives. In unconsolidated ground a total of 17 pipe umbrella sections. In Lunnerental, counter heading from 3 access points. 19 stage pipe umbrellas from the portals.

Map

Specific figures

Contract value

CHF 90 million

Construction period

2000 - 2004

Length

3400 m

Total excavated surface

135 m2

Contact for questions about the project
Implenia Industrial Construction
Telefon: +41 43 233 39 90
E-Mail: Sandra.Guetg@implenia.com

Services

Underground construction
- Transport tunnels (tunnels, underground power plants, shafts)

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