Back to overview
Tunneling

Stuttgart
Los 1A und Los 1B - Stuttgart 21

Stuttgart, Germany / 08.2011 - 02.2019

As part of the Stuttgart 21 rail project, the joint venture comprising PORR Bau GmbH and PORR GmbH & Co. KGaA was involved in lots 1A and 1B. The client was DB Netz AG, represented by DB Projekt Stuttgart–Ulm GmbH. The scope of work included the construction of several tunnel sections and junction structures for the future route in the greater Stuttgart area.

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 t
© PORR AG

Facts & Figures

Company

PORR Bau GmbH and PORR GmbH & Co. KGaA in a consortium

Type

Tunneling

Runtime

08.2011 - 02.2019

Principal
DB Netz AG, represented by DB Projekt Stuttgart–Ulm GmbH

A new high-speed rail network for Europe.

Lots 1A and 1B form part of the new rail links between the future Stuttgart Central Station, the Filderebene as well as the Ober- and Untertürkheim districts. The construction works comprised both mechanised tunnel boring as well as conventional tunnelling methods in accordance with the New Austrian Tunnelling Method (NÖT).

Lot 1A: Fildertunnel

The 9.5 km-long Filder Tunnel consists of two parallel single-track tubes and connects the new underground Stuttgart station with the Filderebene.

The tunnel is divided into three sections:Lot 1B: Ober-/Untertürkheim access tunnel

  • Upper Filder Tunnel: The upper section was excavated using a tunnel boring machine (TBM). A shield machine operating in multi-mode mode was used.
  • Middle Filder Tunnel: The middle section is approximately 1.1 km long and was constructed using the NÖT method. The route passes through the geological strata of the Upper and Lower Bunte Mergel.
  • Lower Filder Tunnel: The lower section is approximately 4.1 km long. For this section, the tunnel boring machine was converted into an open-face shield machine. The tunnel runs through sections of the unweathered Gypsum Keuper.

The Ober-/Untertürkheim access tunnel connects the southern exit of the future underground station with the existing railway lines. The structure consists of two parallel single-track tunnels, which were also constructed using the NÖT method.

Junction structures and intermediate access shaft

A key component of the project is the main tunnel between the junction structure at the northern end of the Filder Tunnel and the Wangen junction structures. An intermediate access shaft was constructed in the Ulmer Straße area. From there, tunnelling proceeded in both a westerly and an easterly direction.

Connection to Untertürkheim and Obertürkheim

Two tunnel branches extend from the Wangen junction structures: these tunnel structures form part of the future rail infrastructure in the Stuttgart area.

  • a tunnel branch towards Untertürkheim, connecting to the open-cut section of the Untertürkheim construction pit
  • a tunnel branch towards Obertürkheim, approximately 1.4 km in length

Basis for the new route

The tunnel structures in Lots 1A and 1B constitute key components of the future railway infrastructure as part of the Stuttgart 21 project. These structures connect the future underground station with the adjoining sections of the line and form the basis for further technical installations and railway operations.