A consortium consisting of Bouygues Travaux Publics, Soletanche Bachy and CSM Bessac has signed a contract worth €164.9 million with RATP for the second tunnel package on the Paris metro line 14 extension project, north of Paris, running from Clichy-St Ouen to Pleyel, in the neighbouring town of St Denis.
The underground infrastructure project, which is 55% financed by Société du Grand Paris, will help to relieve congestion on Line 13, improving travel conditions and access to Paris for people living in the northern suburbs. The 5.8km underground extension includes four new stations; Pont Cardinet, Porte de Clichy, Saint-Ouen and Mairie de Saint-Ouen. The Bouygues-led consortium will be responsible for constructing a 2.2km tunnel linking Clichy-St Ouen and Pleyel, including a tunnel that links to the train maintenance and marshalling zone. It will also work on the Mairie de St Ouen station, as well as four ancillary structures, including reinforcing the infrastructures of line C of the RER (Regional Express Network).
The Bouygues-led consortium will place a strong emphasis on sustainable development. In particular, it will focus on limiting nuisance in a very dense urban environment. All excavated materials will be evacuated by river, for instance, to avoid disrupting road traffic in the towns affected by the project.
The project, which will be carried out with an 80m long EPB TBM, includes several major technical challenges, such as taking account of the diversity of soils along the route of the tunnel and the reinforcement of the infrastructure of line C of the RER, beneath which the connecting tunnel to the train maintenance and marshalling zone will pass. To meet these challenges, the consortium will analyse all data collected from the TBM and resulting from monitoring on the surface in real time in order to have the capacity for immediate response. The works will begin this summer and last several years.
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In March, the Eiffage Travaux Publics and Razel-Bec joint venture was selected for the extension’s first civil works contract. That contract covers the construction of a 3.6km length of tunnel and the first two new stations at Pont Cardinet and Porte de Clichy.