Rome’s third B1 Line metro extension complete2 March 2012
Excavation of the third extension to the B1 metro line in Rome, Italy finished last week. A Seli EPBM was used by the firm’s contracting side, which was appointed as the tunnelling subcontractor. Main contractor was a JV of ATI Salini Costruttori and Tecnimont. Roma Metropolitane was the developer.
The 522m drive from Conca d’Oro to Piazzale Jonio, both in the city’s northeast, began in June 2010. The complete tunnel is 1.1km-long and 10m in diameter. Previous portions were completed at the end of 2009, for the Conca d’Oro to Gondar portion and September 2010 for the Conca d’Oro to Piazzale Bologna section.
Geology encountered was clay and friable soil.
The final drive took around 20 months