Technical specifications

Scope of work

  • Length: 2.2 km, excavated cross-section: 80 m² - 100 m²
  • 2 parking bays, area: 125 m²
  • 6 cross-passages to an existing exploration tunnel
  • Ventilation shaft, diameter: 4m, depth: 38 m
  • Service buildings and emergency exit shafts

Construction method

  • Drill and blast method in combination with tunnel excavator,
    length: 1.4 km;
  • Cut and cover method: 732 m


  • Ground moraine
  • Flysch sedimentary rock

General data

B 1 Federal Road Wiener Straße
Henndorf Bypass, two-lane road tunnel

Land Salzburg, Landesbaudirektion
[State of Salzburg, State Building Authority]

Wayss & Freytag Ingenieurbau AG
as technical leader of a joint venture

Construction period
2006 to 2009

Construction costs
€ 38 million

Road Tunnel, double-track
2.2 km
Construction Method
Drill and blast method in combination with tunnel excavator

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