Mechanised tunnelling
In the past Wayss & Freytag was significantly involved in the development of mechanized tunnelling techniques. For example, they initiated the support of the tunnel face by means of a bentonite suspension and air-cushion. With the so-called “slurry shield” this technique was brought to operational maturity. Wayss & Freytag is a pioneer of this technique and has in the meantime driven more than 150 km of tunnel using slurry shields. In addition, more than 80 km of tunnel were driven using earth pressure balance shields and 30 km using hard rock TBMs.
Related Projects
Parallel drive with two TBMs with EPB shields for the extension of the Karlsruhe – Basel motorway.
During the construction of the Leipzig City Tunnel in the shopping centre under the station concourse of Leipzig Main station it was not possible to carry out any works from above ground. Therefore, two pilot tunnels were driven by pipe jacking so that vertical freezing bulkheads could be built.
1,700 m above sea level: In the Linthal Project 2015 the inclined tunnel with an incline of 24 % compensates an altitude difference of 900 m in the high mountains of Switzerland.
Resources
