In the Grand Paris Express project,: all the structures require construction of reinforced concrete retaining walls

In the Grand Paris Express project, all the structures (undergroud stations and TBM launch shafts) are executed at a significant depth and require the construction of reinforced concrete retaining walls through diaphragm walls that sometimes can reach more than 60 m in depth.

For executing these works, in consideration of the excavation depth to be reached, the high thickness of the walls, the verticality tolerances and the geology of the ground to drill, Trevi uses drilling equipment such as state-of-art heavy-duty buckets and hydromills to guarantee the highest quality standards.