1 - Installation of foundations (piles or diaphragm walls)


2 - Excavation by levels with installation of struts to hold the ground / Sprayed concrete works.


3 - Construction of foundation slab, walls and slabs of the platform, intermediate levels and top slab.


4 - Infilling


The specificity of Saint-Germain station is underground excavation. The top slab is made first. Then excavation is performed under the cover slab.