In traffic route construction, a retained cut consists of lateral retaining walls and a closed invert, the latter normally being constructed as a ramp. The traffic way is built on the ramp.
If situated below the groundwater table, such a retained cut has to be made waterproofed, e.g. by using water resistant concrete. In such a case, the structure is to be protected from uplift (buoyancy). This can be achieved by means of the structure's own weight and/or by anchoring it in the subsoil. Driven piles made from reinforced concrete or steel or reinforced concrete bored piles are used for anchorage
The most demanding contract section was executed underneath the historic central station building during full traffic.
Retained Cut constructions remove bottleneck in main transportation network in northern Hamburg