Technical specifications

Scope of work

  • 1 double-track railway tunnel (Oenzberg Tunnel)
    total length: 3,161 m, of which 2,265 m were driven using a TBM
    internal diameter: 10.84 m;
  • 2 single-track branch-off tunnels (Wolfacher Tunnels)
    lengths: 754 m
    excavated cross-section: 80 m²

Construction method

  • Oenzberg Tunnel:
    TBM-tunnelling using a convertible TBM:
    1,925 m in hard rock mode
    340 m in slurry shield mode
    shield diameter: 12.34 m
    double lining consisting of reinforced concrete segments
    and an in-situ concrete inner lining with external water proofing;
  • Branch-off tunnels (Wolfacher Tunnels):
    roadheader tunnelling: 900 m
    sprayed concrete lining (SCL) method
    cut and cover method = 0.1 km

Geology

  • Molasse
  • Moraine

General data

Project
Oenzberg Tunnel,
double-track railway tunnel,
new railway line between Zurich and Bern (200 km/h)

Client
SBB Project Group “Neubaustrecke Mattstetten - Rothrist”
[Swiss Federal Railways]

Contractor
Wayss & Freytag Ingenieurbau AG
in a joint venture

Construction period
1999 to 2003

Construction costs
€ 150 million

Utilisation
Infrastructure
Type
Railway tunnel, double-track
Length
3,161 m
Construction Method
TBM Vortrieb Hydroschild and Hartgestein
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