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
Storage sewer at Berlin's Mauerpark will prevent sewer overflow into the Spree and Pranke rivers in the future.
Due to swelling events and the associated heave and damage to the tunnel inner lining, it was planned to install protective netting in the area of the tunnel roof and the upper side walls.
Twin-tube road tunnel under the River Thames, 2 x 1,400 m long, internal diameter 10.66 m, external diameter 11.45 m, Access ramps, 600 m in length
1 four-lane motorway tunnel, total tunnel length 1,100 m, length of total section on our behalf approx. 4,800m.