Austria

Pfänder Tunnel: 2nd Bore opened for Traffic

The 6,585 m long, two-lane Pfänder Tunnel on the A14 in Vorarlberg/Austria with an average daily frequency exceeding 30,000 vehicles is being provided with a second bore, which is also 2-lane, to enhance its safety and efficacy after 28 years. The ASFINAG, the state company in charge of highway development, is turning to a tunnel boring machine for the first time to produce a long road tunnel, in this case a simple shield TBM (Herrenknecht S-494) with 11.84 m cutterhead diameter. The new tunnel bore is monocoque lined with 25 cm thick reinforced concrete segments (5+1; 2.00 m). The...

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