Tunnels - Wayss & Freytag Ingenieurbau AG

Henndorf Bypass
Austria
General Data:
Project: B 1 Federal Road Wiener Straße, Henndorf Bypass, two-lane road tunnel
Client: Land Salzburg, Landesbaudirektion [State of Salzburg, State Building Authority]
Contractor: Wayss & Freytag Ingenieurbau AG as technical leader of a joint venture
Construction period: 2006 to 2009
Construction costs: € 38 million
Technical Data:
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
Geology: Ground moraine and Flysch sedimentary rock
Vienna Metro - U2/2 Taborstrasse
Austria
General Data:
Project: Metro line 2, Section 2, Taborstrasse
Client: Wiener Linien GmbH & Co KG
Contractor: Wayss & Freytag Ingenieurbau AG
in a joint venture
Construction period: 2002 to 2007
Construction costs: € 110 million
Technical Data:
Scope of work: Length: 2 x 1.1 km, excavated cross-section: 39 m² - 44 m²;
2 station tubes, excavated cross-section: 65 m²;
access and supply shafts
Construction method: Tunnel excavator:
advance under the protection of jet-grouted canopies and jet-grouted bulkheads
Dewatering:
270 wells up to a depth of 40 m, electronic monitoring and control system,
maximum output 285 l/s, total output 25 million cubic metres of ground water
Geology: Tertiary silts and sands, groundwater
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