Client: DB Netz AG, Frankfurt
Project author: DB Projekt Stuttgart-Ulm GmbH
Construction: ARGE Tunnel Feuerbach
Partners: Baresel GmbH | Bertschinger Bau GmbH | AUGUST REINERS Bauunternehmung GmbH
Tech. Management: Baresel GmbH
Commercial management: AUGUST REINERS Bauunternehmung GmbH
Object: DB Stuttgart-Ulm project, PFA 1.5, lot 2 (mainline feeder line from and to Stuttgart main station — Stuttgart Feuerbach)
Period: 2012
As part of the major Stuttgart 21 project, AUGUST REINERS has been involved in PFA 1.5, Lot 2 for the construction of the Feuerbach tunnel since May 2012. The overall project includes the conversion of the terminus station into an 8‑track, lower-lying through station for long-distance and regional traffic. Compared to the current location of the main station, the future main station will be rotated by approx. 90 degrees. It will be connected underground by feeder lines from Feuerbach, Bad Cannstatt, Ober- and Untertürkheim and the Filder plain.
The Feuerbach tunnel begins at the Feuerbach stop, for which the main line coming from Mannheim is lowered at Borsigstraße. Via a new trough structure to be built, a tunnel with a cover construction and after crossing under the SSB and S‑Bahn tracks by mining means, the mainline railway line will first be routed to the new through station in a double-track tunnel and then in two single-track tunnels.
The overall construction project includes the following services: Structures using the cut-and-cover method: Retaining walls; pedestrian underpass; rescue access; trough structure; cut-and-cover construction; structures using the mining method: Prague access tunnel (L=319m); Feuerbach branching structure (double-track, 320m); two single-track tubes of the railroad tunnel (1 x L=2,449m, 1 x L=2,426m); five connecting structures; mining undercutting of the SSB and S‑Bahn tracks in a rectangular profile under the protection of a bored pile wall and a DSV advance support.
The mainline tunnels to and from Stuttgart — Feuerbach are driven from an intermediate heading with three main headings. The tunnel portal of the ZA Prague intermediate heading is located at the east portal of the existing Prague Tunnel. The tunnel has a total length of 319 m and a gradient of 7.11%. The two single-track tunnels begin behind the Feuerbach branching structure and end at the transition to Lot 3. They are 2,449 m and 2,426 m long respectively. Due to the partial tunnel location in unleached, anhydrite-bearing gypsum keuper, different cross-section types and thus constant adaptation of the tunnelling work to the geological conditions are necessary. Extensive grouting work is also planned. This will be followed by the inner shell work.
Prior to the construction of the trough structure and the tunnel using the cut-and-cover method, extensive site clearance work is required in the track area at the Feuerbach stop. This includes the construction of a new passenger underpass and the conversion of the platforms. The existing 2‑track long-distance railway line and suburban railroad line are to be swung into various intermediate states and into a final state under railroad operation so that the long-distance railway feeder line can be built in an island position. The special tasks of this project are made up of numerous influencing factors. In addition to the generally cramped inner-city conditions, especially in the area of the Feuerbach stop, the local public transport service that has to be maintained there leads to considerable time, space and logistical restrictions. The main challenges for the mining drive are the complex and sensitive geological conditions as well as the particularly high emission requirements in terms of noise and air pollution control. In addition, the entire project is in the public eye, which requires a sensitive approach.
TECHNICAL DATA
Structural function: Railway tunnel
Tunnel length: OBW 451 m | BBW 2,449 m / 2,426 m
Excavation volume: 475,000 m³
Construction method: Shotcrete construction method (blasting/excavation)
Tunnel support: pipe umbrellas, anchors, support arches, shotcrete, spiles
Maximum overburden: 150 m
Minimum overburden: 10 m



