Grand Paris Express monitoring – L14 South GC02 | France

Improvement of services to Orly airport

This contract is part of the construction project for the Grand-Paris public transport network, which includes extending line 14 from Olympiades to Orly Airport.

The extension of L14 South was divided into four work packages. Work package GC02 includes Kremlin Bicêtre – Hôpital station, the tunnel between the Jean Prouvé annex structure and Maison Blanche – Paris station, as well as five annex structures.

The consortium of Dodin Campenon Bernard (lead contractor), SPIE Batignolles TPCI, VINCI Construction France, VINCI Construction Grands Projets, Botte Fondations and SPIE Fondations is carrying out the civil engineering work for this work package for €415 million.

Neighbouring infrastructure subject to close monitoring

Sixense were  asked to carry out all the monitoring relating to these works. Our teams used all standard technical monitoring techniques for this type of contract: topographic surveying and structural instrumentation of structures and geotechnical monitoring during tunnel boring work (inclinometers in the ground, multipoint extensometers and piezometers).

A system to monitor noise and vibration produced by the works has also been established. Particular attention is paid to the project’s neighbouring infrastructure that remained in operation during the works and was impacted for long distances, including the A6B motorway cutting, the Paris ring road at Porte d’Italie and RATP metro line 7. Automated monitoring using Cyclops and Centaurs were used to ensure user safety. The Geoscope platform developed by Sixense provides all project participants with permanent centralised access to data.