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.
The new underground line provides a connection between the Moosach district and the „Olympia” shopping centre which was also built by W&F Ingenieurbau.
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.
4 km tunnel for a 48-inch gas pipeline between Rysum (D) near Emden and Midwolda (NL).
The North-South link Antwerp is part of the Brussels-Amsterdam high-speed line. The project comprises the reconstruction of the existing accesses, the construction of a passage under the main station as well as the construction of two tunnel sections from „Astridplatz“ to „Damplatz“.