Tunnels, retained cuts and top-down excavations - special kinds of traffic structure.
Wherever geology and inner city traffic conditions permit, cut-and-cover tunnels, retained cuts and top-down excavations are preferred for financial reasons. Moreover, almost all access and exit ramps of shield-driven tunnels, which take traffic underground and back to the surface, are also constructed within sheet-piled excavations.
Cut-and-cover tunnels rank high among the numerous traffic route projects carried out by Wayss & Freytag Ingenieurbau AG. Important structures of this kind, either already completed or currently under construction, are the Berlin Inner Ring S21 and the Leipzig City Tunnel, Contract C.
Innercity road tunnel in the heart of Dusseldorf creates new space for urban living
The 2,800 m long, inner-city tunnel using both bored pile-cover construction method and open construction method relieves a central traffic junction in Munich.
A special procedure allowed for blasting operations with ongoing traffic on BAB 8
60.000 m² coherent park area for approximately 40.000 inhabitants – a street tunnel makes it possible.