Lausanne metro, lots 1100 and 1200, Lausanne

Construction of two double-track underground railway (metro) tunnels with two underground stations and lowering of the tunnel base in an existing tunnel in the city.

  • Flon station 70 m
  • St. Laurent station double-track tunnel 306 m
  • Riponne station, length 85 m
  • Construction in part using cut and cover
  • Viret double-track tunnel, length 265 m
  • Lowering of the tunnel base in the existing tunnel by approximately (lot 1100)

  • Heading with roadheader machine for full 66 m2 cross section
  • Supported with lattice arch girders and reinforced shotcrete,
  • in portal areas with pipe umbrella vault.
  • St. Laurent Tunnel with single-skin shotcrete construction
  • Viret Tunnel with all-round sealing and
  • lining in reinforced shotcrete.
  • Lowering of existing tunnel: Underpinning with jetting


Specific figures

Contract value

CHF 76 million

Construction period

2004 - 2008


726 m

Total excavated surface

66 m2