Tunnel Königshainer Berge - Vom Brandschaden zum Instandsetzungskonzept

Tunnel Königshainer Berge from fire incident to repair concept

On May 18, 2013, a truck fire happened in the southern tube of the Tunnel Königshainer Berge - 600 m before the eastern tunnel portal. After the fire, concrete spalling was observed in the crash area. For the evaluation of the damage degree of tunnel lining, sealing, drainage, cable ducts, sidewalks etc. experimental investigations and numerical calculations have been conducted in order to derive repair measures. On the basis of the evaluated fire load, the temperature loading on the tunnel lining was determined - both site- and time-orientated. These information were used to calculate the temperature ingress and distribution and to verify the static and structural effects in comparison to the experimental investigations and material tests. As a conclusion, a repair concept for the structural concrete was derived and executed.