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ÖBB inserts a new supporting structure for the Inntal viaduct into the final position. How did precision work with 2,200 tons go?

ÖBB inserts a new supporting structure for the Inntal viaduct into the final position. How did precision work with 2,200 tons go?
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?
11 / 08 / 2022

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.

Eight concrete arches weighing 2,200 tons had to be put into the correct position. Since the start of construction work in mid-April, a lot has happened at this hotspot of Karwendelbahn construction work. Eight of 16 arches of the Inntal Viaduct were removed due to their structural condition. The existing foundation was reinforced in the process using DSV (jet grouting) columns. The main focus of the work was on the eight new arches construction, including the supporting structure (future roadway) for the Inntal Viaduct, in the eastern connecting road area running parallel to the Karwendelbahn line between Egger-Lienz-Strasse and the Innrain.

New Inntal Viaduct glides over Teflon track at 26 cm per stroke

For the specialists of ÖBB-Infra and the companies involved, today's insertion of the new viaduct meant precision work made to measure. The 2,200-ton structure was pulled into place by hydraulic presses in parallel at 7 points on the prepared transfer track made of steel plate on Teflon with high-performance grease. The challenge was to ensure that all presses were pulled uniformly so that there was no structure entanglement. The presses operated at a pressure of 400 bar per press. Per stroke, the structure covered a distance of 26 cm along the shifting track. In total, the entire insertion process took only around one hour. The following steps will be to work on ballast and track grating, adapt the overhead line to the new track position, install the new signals and complete the railings and connecting structures, including the new track. Trains are scheduled to start rolling over the renewed viaduct on August 22. According to current planning, a further eight arches are to be renewed in the same way in 2025. The experience gained from the preliminary work and the previous insertion will be incorporated into the renewal of the second section.

 

Source: ÖBB Press Releases

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