SBT 2.1. Fröschnitzgraben

Client: Österreichische Bundesbahnen AG (ÖBB)

Contractor ARGE / JV

Swietelsky – Implenia

General tunnel Semmering – pilot point 2.1

  • Shaft Fröschnitz 1 and 2 with a depth of more than 400 m, a diameter of 11 m or 8.5 m
  • Building for operation and ventilation Fröschnitzgraben
  • Two connected excavation fronts (including a cavern), approximately 8.6 km down towards Gloggnitz
  • Two cyclic excavation fronts, about 4.3 km further towards Mürzzuschlag
  • 26 crossbeams (emergency exits)
  • Parking niches in the length of approx. 1 km
  • 4.4 Mio. m³ of excavated material