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.
4 km tunnel for a 48-inch gas pipeline between Rysum (D) near Emden and Midwolda (NL).
Fehmarnbelt Tunnel Denmark
Rehabilitation of the water reservoir ensures the flood protection in the Isar valley. The construction section comprises the construction of the seepage water tunnel as well as the access structures at both ends of the tunnel.
Biggest individual construction project within the scope of the traffic project Deutsche Einheit (German unity) 8.2 New section Erfurt – Leipzig/Halle.