Stuttgart 21, Lot 1A and Lot 1B

As part of the 1,500km Highway for Europe, PORR is building the new stretch from Stuttgart to Ulm. Once the entire project is completed, the high-speed network will connect cities and regions with a total of 34 million inhabitants and 16 million jobs in five countries. Also situated directly on the West-East axis, a link between the cities of Paris, Straßburg, Munich and Vienna to Bratislava and Budapest, are the German towns of Stuttgart, Karlsruhe and Ulm. This section will thereby be a key artery for the economic, political and cultural relationships between Western and Eastern Europe.

It is not only rail routes that are being built in the course of the project; it also encompasses a wide range of construction measures. In addition to engineering structures and the new construction or adaptation of station facilities, there are also plans for a comprehensive urban development project with multiple building construction and civil engineering works:

Lot 1A.
The 9.05km Filder Tunnel consists of two parallel single-track tunnels and connects the south head of the new underground railway station in Stuttgart with the Filder Plain. The tunnel is divided into three sections:

• The Upper Filder Tunnel is being driven using TBM technology with the help of a multimode shield machine.
• The Middle Filder Tunnel will pass through the Oberer Bunter Mergel and the Unterer Bunter Mergel over a length of 1.1km and will be realised using the NATM (New Austrian Tunnelling Method).
• The Lower Filder Tunnel, with a length of 4.1km, will pass through the anhydrite, unleached Gypsum Keuper. To achieve this, the TBM will be converted to an open shield machine.

Lot 1B.
The Obertürkheim/Untertürkheim connection tunnels will be realised with two parallel single-track tunnels and connect the south exit of the new underground station with the existing railway line. PORR is also using the NATM here. The connection tunnels consist of a main tunnel that will lead from the branch-off at the north end of the Lower Filder Tunnel, heading east to the Wangen branch-off.

The Ulmer Straße intermediate heading is situated just before Wangen, via which the main tunnel to the west and the east will be driven up to the Wangen branch-off. From Wangen there will be a branch heading north, where it will reach the construction pit after around 1km of cut-and-cover tunnelling. A second branch will lead from the Wangen branch-off heading south-east and end in the Obertürkheim construction pit after approx. 1.4km.