Stahlsonderkonstruktion Special Steel Structure

Special Steel Structure for the Schwäbisch Gmünd Tunnel

1 3D model of the exhaust air centre; on the right breakdown bay 2 with
the junctions to the main tunnel. On the extreme right the adjoining cross-passage No. 4. Below left the electrical tunnel and above the ventilation tunnels with the construction shaft extending in the rear area

2 Section through breakdown bay 2 with a view of the ventilation tunnels. The intersection geometry is shown in colour

3 3-D presentation of the special steel structure consisting of GI and TH profiles

4 Planning of the stop brackets

5 View of the western pre-cut with the portal of the main tunnel on the left and the portal of the evacuation tunnel on the right. The evacuation tunnel becomes narrower after a 10 m long starting block to form the small 20 m² cross-section, which is only partly negotiable

6 Preparing for part blasting (mixed-face excavation) in the main tunnel. The division between Stuben sandstone and upper coloured marl is easily discernible

7 Assembled bracket with branching bracket

8 View of breakdown bay 2 from the main tunnel standard profile during work on bench and invert

9 Bench and invert in breakdown bay 1: surveying work to create cross-passage 2

10 Follow-up bench and invert excavation in the main tunnel

11 Installing the enlarged starting block for the evacuation tunnel

Fotos/Photos: Baustelle/Scheiber/Rosenfeld

12 Breakdown bay 2 intersection with ventilation tunnels

Fotos/Photos: Baustelle/Scheiber/Rosenfeld

Since spring 2008 work on the bypass for Schwäbisch Gmünd/D has been in progress. Towards this end the B 29 federal highway is being laid in a 2,230 m long section under the town. Roughly 1.7 km of this section is being driven by mining means. Cut-and-cover sections 315 and 228 m in length link up with it in the east and west.

The work was awarded
to the JV Tunnel Schwäbisch Gemünd consisting of the companies Ed. Züblin AG, Baresel GmbH, G. Hinteregger & Söhne Baugesellschaft m.b.H. and ÖSTU-STETTIN Hoch- und Tiefbau GmbH. The client is the Federal Republic of Germany represented by the Regional Council in Stuttgart.

The new development of the B 29 is expected to provide considerable relief for the inhabitants of the town of Schwäbisch Gemünd. At present the federal road runs through the middle of the town. As a main traffic artery it links Allen with Stuttgart running through the Remstal and serves as an access...