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  FEDRO’s Tunnel Renovation Method

  To ensure the availability and usability of the motorway network, the Federal Roads Office (FEDRO) developed new solutions for the renovation of road tunnels while keeping them open to traffic, and initiated a pilot project. The aim was to replace a non-reinforced inner shell at night and ensure the availability of all lanes during the day. The solution involved partially removing the existing inner shell, then installing a drainage and waterproofing system, and finally casting a new inner lining of self-compacting concrete during the night. The success of this pilot project led to the decision to renovate more tunnels using the same process without delay. FEDRO’s innovative method will make it possible to renovate road tunnels over the long term while maintaining daytime traffic flow without massively impacting their substance.

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