Construction Journal

Oct. 29, 2020

Alex tunnel: 100 percent lightened!

Leichterung Bagger Alex-Tunnel Oktober 2020 © A. Reetz-Graudenz

To ensure that the U5 trains can travel safely through the Alex Tunnel from 4th of December, the load over the tunnel had to be reduced by a total of 10,000 tons. This was necessary because during earthworks in 2017 it was discovered that the tunnel was covered with more massive layers of soil than the original plans indicated.

Now we can report: the Alex Tunnel is ready for the new U5! The too heavy soil layers have been completely removed, the tunnel is now 100 percent lightened. In the coming weeks, the excavated area above the tunnel will now be filled up with the light foam glass gravel and the surface will be restored.


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