Special features

As a result of the new construction of Stuttgart’s main station, part of the current light rail tunnel between Arnulf-Klett-Platz and the Türlenstraße stop will be relocated. This follow-up measure consists of two single-track mining tunnel tubes and the branch and junction structures to be constructed using the cut-and-cover method.

The tubes, which are to be constructed using mining methods, start at Heilbronner Straße and reconnect to the existing structure at the level of Türlenstraße, with branching structures being built shortly beforehand for the continuation of an additional U12 light rail line into the new A1 construction area created as part of Stuttgart 21. These branching caverns are produced as a WU construction in in-situ concrete and concreted block by block using special formwork.

According to the original construction schedule, it was planned to construct the branching cavern in “dissolved construction” according to the principle of base, walls and dome vault. RSB presented and offered a special proposal to the client, in which it is planned to concrete the base in advance, but to produce the walls and cap in one “pour”. The resulting handling advantages and the enormous time savings of this solution finally persuaded the customer to choose this variant. The 10 m long and approx. 120 tonne special construction is moved, positioned and shuttered fully hydraulically. The necessary intermediate conversions and transports could be carried out in cooperation with the customer and with the many years of experience of FA. RSB in special and tunnel formwork construction could be reduced to a minimum, which also led to advantages of the system in terms of increased efficiency.