For this purpose, a 2.5 km long underground tunnel will be drilled in Saint-Denis in 2021. The first stage of this major project is the construction of boreholes that will allow the tunnel-boring machine to be lowered. With on-site support: Two with XL hydro-milling machine and diaphragm wall grab. Thanks to the high load capacity of 24 t at a working radius of 20 m, heavy attachments can be operated in grab operation – certainly with guaranteed maximum stability thanks to the robust wide-track undercarriage. The maximum load capacity of the machines is 140 t.
CHALLENGING PROJECT CIRCUMSTANCES AND DIFFICULT GEOGRAPHICAL CONDITIONS
This major project is located in a highly urbanized area, bounded by several railroad and waterway lines, where extensive work will take place until 2024. Also affected are power lines that are essential for the electricity supply of the northeast of Paris, as they supply around 800,000 households, including the train station Gare du Nord and Line 13 of the Paris Metro. To meet all these challenges, RTE has chosen a technical solution that is tailor-made and exceptional for an electricity distribution network operator: the construction of a 40 m deep tunnel to run the new lines.
For the realization of this tunnel, RTE relies on the expertise of Arcadis as deputy project managing company and on the consortium of the companies Spie Batignolles Fondations,