Tunnels - Wayss & Freytag Ingenieurbau AG

Rennsteig Tunnel
Germany
General Data:
Project: Rennsteig Tunnel, twin-tube, two-lane motorway tunnel on the BAB A 71
Client: DEGES Deutsche Einheit Fernstraßenplanungs- und -bau GmbH, Berlin
Contractor: Wayss & Freytag Ingenieurbau AG
as commercial leader of a joint venture
Construction period: 1998 - 2003
Construction costs: € 192 million
Technical Data:
Scope of work: 2 x 7.9 km, standard cross-section: 80 m², emergency lay-bys: 120 m²;
23 cross-passages, 2 central ventilation stations with exhaust shaft; 2 air supply adits;
tunnelling under a 100-year old railway tunnel with a small clearance between the tunnels
Construction method: Drill and blast method, sprayed concrete lining (SCL) method
Geology: Porphyry, conglomerates
Velbert-Langenberg Tunnel
Germany
General Data:
Project: Road tunnel (double-lane) as part of the construction of the new L107 state road in the centre
of the town of Velbert-Langenberg
Client: Landschaftsverband Rheinland / Essen [Rhineland Regional Authority]
Contractor: Wayss & Freytag Ingenieurbau AG
Construction period: 1999 to 2002
Construction costs: € 18 million
Technical Data:
Scope of work: Length: 486 m, excavated cross-section = 85 m²
Construction method: Drill and blast method in combination with tunnel excavator and sprayed concrete lining (SCL)
Geology: Carbonate basement rock, clay and sandstone
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