Redevelopment of Unna Ring Tunnel/D

Traffic Bottleneck sealed by Grouting

When road tunnels must be renovated through being sealed then this can be attributed to 2 reasons: either leaks and moisture have spread in the tunnel in the course of the years – or, how-
ever, some dramatic event has occurred, which suddenly causes the tunnel to leak. The latter happened in the city of Unna in the Ruhr District. The 3-lane Ring Tunnel – a main urban traffic artery and first thoroughly renovated at great expense back in 2008 – was seriously damaged by an accident and thus had to be resealed. One morning in September 2010 the loading crane of a heavy lorry travelling through...

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