The construction of tunnels using conventional construction methods has always been a challenge to every engineer. Here, the engineer’s most important task is the evaluation of the geology and the selection of the right means of securing the excavation face until final completion of the inner lining. Wayss & Freytag already rose to this challenge in 1905 when building a railway tunnel using the conventional tunnelling method in Wasserburg/Inn in gompholite (Nagelfluh) and gravel.
The range of conventional tunnelling reaches from soft rock tunnelling (e. g. a metro tunnel in Munich gravel) and tunnelling in compressed air (e. g. Ostbahnhof metro station in Munich in Tertiary formations below groundwater) to classic drill and blast drives (e. g. Rennsteig Tunnel on the A 71 motorway, which, with a length of 8 km, is the longest motorway tunnel in Germany).
The extension of the Klaus tunnel string with the 2nd tubes on the A9 Pyhrn motorway in Austria means the end of oncoming traffic and thus provides better safety for 18,000 drivers per day.
Due to an advantageous layout of tunnel portal and tunnel excavator is was possible to do without shunting bays and laborious shunting during the construction of the single-track railway tunnel.
While investigating on the trail of the beginnings of the universe – in the nuclear research centre CERN the quarks go to the racecourse. The tunnels and caverns for the biggest machine in the world were built by Wayss & Freytag Ingenieurbau.
Accessibility and a steady increase in ridership place new demands on the infrastructure of the city railway station Dortmund. Conversion and extension of the light rail system provide the sustainability safely.