Paris MRT – Extension of Line 12

Paris MRT – Extension of Line 12

SYSTRA was appointed project manager for the Line 12 extension of the Paris metro. Phase 1 of the extension project to Front Populaire was completed in 2012. Phase 2 will extend the line even further northwards.

Launched in 2006, the Line 12 extension project involves the construction of 3 new stations, a 3km tunnel and the refurbishment of the former terminus at Porte de la Chapelle.

During Phase 1, Line 12 was extended to Front Populaire station. Work started on Phase 2 in 2013 including the construction of two new stations, Aimé Césaire and Mairie d’Aubervilliers, as well as a technical maintenance facility.

Phase 2 of the extension is due for commissioning in 2019. In the longer term, the terminus at Mairie d’Aubervilliers will connect to the Grand Paris metro network.

As project manager, SYSTRA was responsible for:

  • Design studies
  • Geotechnical surveys
  • Analysing and approving alterations
  • Planning study certificates
  • Supervising the construction of a temporary flyover
  • Coordinating technical activities
  • Scheduling, supervision and coordination.

Teams from SYSTRA were involved in the following phases:

  • Preliminary designs
  • Detailed designs
  • Assisting with the works contracts
  • Works contract delivery
  • Assisting with acceptance procedures.

SYSTRA used its expertise to devise technical solutions for use in this cramped urban environment, and in particular for the construction of the station at Mairie d’Aubervilliers. The 280m long station comprises 25 000 m² of diaphragm walls, with 1m to 1,20m thickness, from 40m to 45m depth, as the sub-soil is very loose, the water table close and the urban environment above most dense.

The building site is in the heart of Aubervilliers. We therefore decided to make the most of the nearby St Denis Canal to ship aggregates for concrete and evacuate the spoils from the earthworks by barge, to reduce the impact of heavy traffic on the roads. In total, 45,000 to 50,000 lorry loads of materials will be transferred to the waterway throughout the project.” explained Project Manager, Franck Coulaud.

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