Rail Monitoring, East London, UK
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Nuttall, Wayss, Freytag and Kier JV, main contractor for the Channel Tunnel Rail Link Contract 250, had to give assurances to Network Rail and London Underground Ltd that their tunnelling activities would not jeopardise the existing rail infrastucture. This was particularly important through the strategic rail complex at Barking, which is in operation 24 hours a day. A number of different methodologies were considered, but following the success of the Bridge Jacking exercise, at Renwick Road, using Leica GeoMoS and Leica TCA2003s, they decided to employ similar techniques for the last 1.4km of the TBM drive.
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