ABSTRACT
Line M4 will cross Milan with a length of about 15 km from west to east along Viale Lorenteggio, through the south of the old town and along the axes of Forlanini up to Linate Airport. The central part is very close to the historical town and the interference with the pre-existing, especially the monumental and archaeological heritage, shall be carefully investigated. In the stretch between Tricolore and Solari Stations, the metro stations are considered as “deep”, reaching depths of 25-30 m below ground level: the stations layout is composed by a central shaft, with transverse dimensions about 10 m located in the main roads or parks, and lateral running tunnels, constructed using a TBM-EPB with a 9.15 m diameter which is able to be lodged inside the tunnel the stations’ platforms. The “De Amicis” station is one of these; during the first excavation step of De Amicis Station, an ancient wall which constituted the Naviglio of San Gerolamo, dated back to the Middle Ages (XIII-XIV sec.) have been discovered. Some stones of the wall are from the Roman Era, probably part of a previous structure, reused as a “quarry”. The relevance of these findings, located close to the Pusterla area, one of the secondary entrances of the city, forced to modify the layout of the station to create a museum space to host the ancient wall in its original position. The paper describes the “deep station” project, with construction details, and the solution adopted to exhibit the archaeological evidences.
