The project to mechanize the Place d'Italie station, an existing station of the Paris Métro, consists of creating new accesses to improve accessibility to the network for people with reduced mobility (PRM) and improve the comfort of travel for all passengers.
The two accesses, known as Accès Blanqui and Accès Auriol (NORTH and SOUTH), include the construction of a shaft and a gallery to install escalators.
The Blanqui Access project consists mainly of the construction of two structures:
A so-called "main" structure housing two escalators connecting and serving two levels:
The ticket hall SA 220 (+56.77NGF) from CR 218 (+47.85NGF)
The roadway (+60.20NGF) from the ticket room SA 220 (+56.77NGF)
A so-called "secondary" structure was built underneath to allow the creation of new accesses to the lower machinery of the existing escalator serving SA220 (+56.77NGF) from CR218 (+47.85NGF)
The ticketing room is being refurbished (demolition of the commercial premises, work related to the relocation of the control line, etc.), and the operating premises are being given a 1-hour firewall treatment (change of doors and creation of reservations for the installation of fire dampers).
The realization of these new works requires :
For the main structure: an earthwork in a traditional lined shaft and gallery to connect to the existing structure.
For the secondary structure: an underpinning earthwork in a gallery from the CR217 to the existing EM pit.
The project in the Auriol access consists of the construction of two structures:
One structure to accommodate an escalator opening onto platform 1 of line 6 towards "Charles de Gaulle Etoile.”
One structure housing an escalator leading to platform 2 of line 6 towards “Nation."
The project also includes two shafts connected to the corridors and going up to the roadway without emergence, allowing the supply of escalators before closing by a removable trapdoor.
Challenges
The project of the new Accesses of the Existing Station of Place d'Italie has foreseen the 3D modeling of the formwork (definitive reinforced concrete) and the traditional shoring (liernes, abutments, and hangers in commercial HEB/HEM metal profiles).
The earthwork had to be carried out in a very complex context regarding surroundings and existing structures whose positions were not always certain. We expected to find several different networks (electricity, heating, gas) in the first two meters of earthwork that could impact the shoring rights-of-way.
To make the planning more reliable and to be able to consider any shorings to be put in place, we chose to make a 3D TEKLA model by integrating the 3D REVIT model provided by the project manager (RATP).
The modeling of the shafts and galleries, done at the EXE (execution) level, allowed us to share with the construction company (Chantiers Modernes Construction, a subsidiary of VINCI CONSTRUCTION France) the details of the support to be put in place. This facilitated the "visualization" of the execution procedures, made it possible to anticipate the problems of installation of the parts in a confined environment, and control the quantities for each stage on site. The integrated modeling between the temporary shoring and civil engineering also ensured the absence of conflicts between the elements, which is a very important point given that the final structure is completely watertight on the outside.
The distribution to the company of deliverables such as PDF and DWG plans, IFC, DSTV, and dynamic PDF files with the possibility of visualizing the 3D model, helped ensure perfect implementation of the traditional shoring to stay on schedule.
Main role of ENSER FRANCE:
Detailer
ENSER FRANCE is the EXE office for the project of the mechanization of Place d'Italie. ENSER FRANCE is the leader of the ENSER FRANCE and TERRASOL group. The mission entrusted to the group consists of the execution studies of the temporary supports for the earthworks (calculation note and execution plans) and the final reinforced concrete coverings (calculation note and execution plans of reinforcement).
The group is also in charge of drafting the notes of assumptions, the follow-up of the methods of execution, the mission G3 study, and follow-up according to the standard NF P 94-500.
Execution company:
Chantier Modernes Construction
Building owner:
RATP
