Abstract
AbstractThe 450‐metre long Kuckuckslay Tunnel is a double track railway tunnel dating from 1871. It is located in Germany on the line between Trier and Cologne along the river Kyll. Since its commissioning, the tunnel is a non‐electrified line and has undergone only a few refurbishing measures. In 2018, a joint venture was commissioned to refurbish the Kuckuckslay Tunnel. During a 2.5‐year construction period, the Kuckuckslay Tunnel will be expanded using conventional tunnelling and provided with a new concrete lining. The so‐called ‘Tunnel‐im‐Tunnel‐Methode' would be used for the expansion, during which rail traffic could be maintained. In this case, the loading gauge of the railway in the area of the tunnelling work would be protected by a mobile construction rig. The Kuckuckslay Tunnel construction project offered a particular challenge due to the severely limited space inside and outside the tunnel, as well as the environmental conditions within a protected area. This article describes how these challenges were implemented and gives an overview of the state of work, as well as technical solutions and experience from the work completed.
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