An unusual scanning project
Preparation is king
Republique Station, with its 130,000 sq ft, is one of the largest stations of the RATP network, serving five lines (3, 5, 8, 9, 11), with a tangle of corridors worthy of the largest labyrinths. As the inventory needed to be exhaustive, the biggest challenge was the need to scan every wall and ceiling, and not forget any part of the station. So we had to think about creating routes to follow that would allow us to logically and optimally cover the entire surface. The other constraint was the timing: scanning had to be made at night as the station was locked, ie only four hours a night, from one to five in the morning. We finally agreed on scanning for two nights, taking a bit of margin on the opening and closing hours.
Without a thorough knowledge of the station, we could not create the routes ourselves. The RATP teams provided us with valuable information: 2D maps of the station, as well as the routes to be followed to ensure scanning completion and to optimize travel time.
Finally, we carried out an on-site tracking to identify the routes and the potential difficulties that we could encounter. We plunged into the backstage of a metro station, starting with the joint inspection visit prior to our intervention, which helped us a lot to understand access issues. Indeed, beyond an unusual architecture, a metro station has mainly security and access constraints that must be respected: one-way escalators that do not work at night, gantries to manage entrances and exits of users, or areas to avoid such as docksides.