Breakthrough at Pfänder Tunnel

A second bore for the 6.6 km long Pfänder Tunnel was driven with a tunnelling machine (S-494, Herrenknecht AG) with 11.85 m cutterhead diameter. The support was provided with 25 cm thick and 2 m wide reinforced concrete segmental rings (5 – 1) and the TBM arrived at the tunnel’s south portal on November 13, 2009 after 14 months. Following the breakthrough 30 cross-passages are now being produced by drill+blast between the 2 tunnel bores as well as the connection with the ventilation shafts. Subsequently the new tunnel tube will be lined (inner shell, concrete carriageway, signal units etc.).


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