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Bossler Tunnel in Germany: »Käthchen« achieves Breakthrough Featured

From the beginning, »Käthchen« achieved top performances. In June 2015 already, two months after the start of the drive in the first tube, she reached the thousand meter mark. After advancing for six months she had already excavated three kilometers. (Source: Herrenknecht AG) From the beginning, »Käthchen« achieved top performances. In June 2015 already, two months after the start of the drive in the first tube, she reached the thousand meter mark. After advancing for six months she had already excavated three kilometers. (Source: Herrenknecht AG)

 

The site crew working with tunnel boring machine »Käthchen« (»Katie«) has completed the second tube of the Bossler tunnel. The breakthrough near Mühlhausen im Tale in Baden-Württemberg is another milestone in the construction of the Stuttgart-Wendlingen-Ulm railway line. The Bossler Tunnel is part of the Stuttgart-Ulm railway project and is expected to go into operation in 2022.
Construction of the two tubes was carried out differently than initially planned. The TBM (Ø 11,340 mm) was able to excavate almost the entire route. At up to 38 meters per day, the work progressed extremely quickly.


When »Käthchen« (Ø 11,340 mm) broke through the target wall, the Earth Pressure Balance Shield (EPB) had completed around 18,000 meters of tunnelling in the sandstone, limestone and claystone rock. The Herrenknecht tunnel boring machine (TBM) finished the second tube of the Bossler Tunnel in early June. Now the shell construction of the tubes in this section is completed. The railway tunnel is of great importance for the new Wendlingen-Ulm line and is expected to go into operation in 2022. Travel time on the Stuttgart-Ulm route will be almost halved. Ten million passengers a year will benefit from the railway project.

The second tube of the Bosslertunnel runs parallel to the first, which the team from ARGE ATA Tunnel Albaufstieg (Porr Deutschland GmbH, G. Hinteregger & Söhne Baugesellschaft m.b.H., Östu-Stettin Hoch-und Tiefbau GmbH, Swietelsky Baugesellschaft mbH) had already completed in November 2016. The TBM »Käthchen« was then disassembled into its individual parts, transported back to the starting point and prepared for the launch of the second drive. From April 2017, the machine again worked its way continuously through the rock.

From the beginning, »Käthchen« achieved top performances. From the beginning, »Käthchen« achieved top performances. she reached the thousand meter mark. She was able to cover up to 38 meters per day and after advancing for six months had already excavated three kilometers – a strong performance on the part of the site crew. A total of 60,000 segments were installed in the Bossler Tunnel. They were manufactured in the purpose-built factory close to the Aichelberg tunnel portal.  

The Albvorland Tunnel is also part of the new construction of the Wendlingen-Ulm railway line. The Herrenknecht tunnel boring machines »Wanda« and »Sibylle« (Ø 10,820 mm) are in operation there – so far they have excavated almost four kilometers of tunnel. As part of the Stuttgart 21 project, Herrenknecht tunnelling technology is also working on the Filder Tunnel. The Multi-mode TBM »Suse« (Ø 10,820 mm) has already excavated over 10 kilometers of the tunnel route planned to connect the main station with the airport.

Machine/Project data S-833

  • Machine type: EPB Shield
  • Shield diameter: 11,340 mm
  • Drive power: 4,550 kW
  • Tunnel length: 2x 8.806 m, tunnelling distance: 17,612 m
  • Geology: brown (claystone, sandstone layers) and white Jurassic (marl, marl limestone, limestone)
  • Customer: ARGE ATA Tunnel Albaufstieg (Porr Deutschland GmbH, G. Hinteregger & Söhne Baugesellschaft m.b.H., Östu-Stettin Hoch-und Tiefbau GmbH, Swietelsky Baugesellschaft m.b.H.)
  • Client: Deutsche Bahn AG

Source: Herrenknecht AG

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