Technical specifications
Diaphragm wall for the covered trench
- 23 panels
- 155 linear meter
- 12 to 17 m deep
- thickness 0.6 m and 1 m
The circular well is also realized using the diaphragm wall technique.
A three steps jobsite
Heavy deep foundations work in the middle of the city do need some organization. We therefore worked in three phases on this project:
The first job was to realize an entry well for a tunnel boring machine, that will be digging the expansion of line 11 towards Montreuil, Carnot and Gainsbourg stations.
Second part is the covered trench of the metro station, that passes under the main street.
Third and last, we will be realizing the last section of the covered trench, which is actually located under the road diversion that has been placed on the surface for the time of the first two phases.
La Dhuys station
Because of the large infrastructure works needed for the construction of the circular entry shaft, the terrain had to be cleared off of its buildings. The Société du Grand Paris and the city of Roisny-sous-Bois are now looking at different urban projects to give a new life to this parcel of land once the works will be done.
The La Dhuys station will have two entries of equal importance, made of kiosks. The subway platforms will be placed 25 m under the street level.
