photo: Kapferer / ÖBB/ÖBB inserts a new supporting structure for the Inntal viaduct into the final position. How did precision work with 2,200 tons go?
In the past weeks, the heat wave with 35° Celsius and more caused tropical temperatures in Tyrol. The experts from ÖBB-Infrastruktur AG were sweating during the insertion of the first section of the new Inntal viaduct.
Significant progress has been made in the construction of the Karwendelbahn project at the Inntal Viaduct site, where eight of the sixteen arches were removed due to their structural condition, and the existing foundation was reinforced using DSV columns. The focus of the work was on the construction of eight new arches and the supporting structure for the Inntal Viaduct in the eastern connecting road area between Egger-Lienz-Strasse and the Innrain.
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Today's insertion of the new viaduct required precision work by specialists from ÖBB-Infra and the companies involved. The 2,200-ton structure was pulled into place by hydraulic presses in parallel at seven points on a transfer track made of steel plate on Teflon with high-performance grease. The challenge was to ensure that all presses were pulled uniformly to avoid structural entanglement. Each press operated at a pressure of 400 bar, and the structure covered a distance of 26 cm per stroke along the shifting track. The entire insertion process took only about an hour.
The next steps will involve working on ballast and track grating, adapting the overhead line to the new track position, installing new signals, and completing the railings and connecting structures. Trains are scheduled to start rolling over the renewed viaduct on August 22. The plan is to renew another eight arches in the same way in 2025. The experience gained from the preliminary work and the previous insertion will be used to improve the process for the renewal of the second section.
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