Tunnelbuilder Promoting the world's tunnelling industry to a huge qualified audience

View the Spanish Tunnelbuilder website View the Italian Tunnelbuilder website

Archive Search


Switzerland, Uetliberg - ch/24

Zurich Motorway

  Tenders called for Uetliberg (4,340 m) and Eggrain (500 m) by Zurich Canton Tiefbauamt. Eggrain will have maximum cross-section of 136 m2 with support by pipe spiles and sprayed concrete. May 1999.Twin 4.4 km three-lane tunnels at 34 m separation with crosscuts every 300 m, every third wide enough for car turning. 3.3 km rock section may utilise 15 m-diameter TBM. 330 m cut-and-cover, 770 m soft ground. Major box section beneath Reppisch river will house crossover and services. Designed by Amberg Consulting Engineers, e-mail amberg@amberg.ch for details. August 1999.   Construction of twin-tube 4.4 km x 145 sq m Uetliberg tunnel in hard sandstone and soft marls as part of Zurich western bypass to commence Spring, 2001. Value $590 million financed 80% by Swiss State and 20% Canton of Zurich. Visit www.amberg.ch October 2000.  Breakthrough of pilot tunnel 20th February, 2003. Reaming to 14.2/14.4 m-diameter commenced using Wirth TBE. Cutters on this model displace radially on a spiral, requiring 8-10 rotations of cutterhead for 20 cm advance. For a full technical description click here. Visit www.wirth-europe.com and www.amberg.ch 19/03.