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Paris tunnelling contract awarded to French consortium

A €164.9M (£131M) contract for the metro line 14 extension works, north of Paris, has been awarded to the consortium of Bouygues Travaux Publics, Soletanche Bachy and CSM Bessac.

The consortium will be responsible for constructing a 2.2km tunnel linking Clichy-St Ouen and Pleyel, in the neighbouring town of St Denis, with a tunnel that links to the train maintenance and marshalling zone. It will also work on the Mairie de St Ouen station and four ancillary structures, including reinforcing the infrastructures of line C of the RER (Regional Express Network).

The 80m long EPB TBM will encounter several major technical challenges, including the reinforcement of the infrastructure of line C of the RER, which will run above the tunnel to the train maintenance and marshalling zone.

The consortium will analyse all the data collected from the TBM as it travels through diverse soils, and monitor information on the surface in real time for fast response times.

The consortium also emphasised the importance of sustainable development during construction by, for example, focusing on limiting nuisances in a very dense urban environment by evacuating materials by river.

The state-owned public transport operator Régie Autonome des Transports Parisiens (RATP) awarded the contract for the underground infrastructure project earlier this month.

Work on the line will begin in the summer of this year and last several years. When completed the project, which is 55% financed by Société du Grand Paris, a public institution under the French government, will help relieve congestion on line 13.

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