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Implenia wins Lyon metro tunnelling deal

The transport association for Rhône Department and Lyon, Sytral, has appointed an Implenia led consortium to undertake the extension of Lyon’s Métro Line B between Oullins and Saint-Genis-Laval/Hôpitaux Sud.

Implenia will work with Demthieu Bard to build the €138M (£123M) lot GC 01 of the Metro Line B project, including a 2.4km long tunnel.

The work includes a new station on Oullins Centre and the tunnel will connect this to another new station at Saint-Genis-Laval/Hôpitaux Sud, which is being built under another contract.

Implenia has confirmed that the 8.5m diameter tunnel will be driven by tunnel boring machine with a launch shaft at Saint-Genis-Laval. According to Implenia, the ground conditions are well understood following extensive ground investigation but said that tunnelling in an urban environment remains a challenge.

Construction is due to start this autumn and will take four and a half years to complete.

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