Extension to Line 14 of the Paris Metro
On 17 March 2014, RATP announced that it had chosen the consortium of companies headed by civil engineering teams from Eiffage Public Works (Grands Projets and Île-de-France), to build the first section of the extension to Line 14 of the Paris Metro.
This project marks the beginning of work on the Greater Paris development plan. The project involves the digging of a 3,600 metre tunnel between Saint-Lazare and Porte de Clichy, and the creation of two new stations (Pont Cardinet and Porte de Clichy). Representing an investment of 220 million euros, the project will relieve the currently overcrowded Line 13 of approximately one quarter of its users.
Further extensions are planned on this line which will, at the end, link Saint-Denis Pleyel in the north of Paris to Orly airport in the south.
© Hervé Piraud.
This is a complex project because the Group’s teams need to work within a limited area, in a dense urban environment, ensuring the removal of 360,000 cubic metres of earthworks and reducing sound and visual disturbance to a minimum. For this reason, the access shafts will be covered by soundproofed cover slabs. The tunnel and the stations will be constructed at least 25 metres below ground, which means that vibrations will be almost undetectable.
Tunnelling is carried out in two phases. Once excavation of the Pont-Cardinet station is complete, a first earth pressure TBM will be installed. As of autumn 2015, it will take six months to drill the 1,500 metres of tunnel between Pont-Cardinet and Saint-Lazare. Then in early 2017, the TBM back-up train will be brought back to its starting position, attached to a second shield, and will begin nine months drilling work to complete the remaining 1,900 metres of tunnel between Pont Cardinet and Clichy/Saint-Ouen. The station will occupy the final 200 metres.