THE FIRST OF THE TWO TBMs THAT WILL BE EXCAVATING IN THE DIRECTION OF FORI IMPERIALI IS LOWERED INTO THE VIA SANNIO SHAFT
The first of the two TBMs (Tunnel Boring Machines) that will be excavating the Line C tunnels towards Fori Imperiali has been lowered into the introduction shaft 3.3 at Via Sannio.
A similar operation will be done to launch the second TBM, scheduled by the end of this week.
The Line C TBMs have a circular cutterhead (the part that excavates the rock) 6.70 m in diameter, connected to the machine body (shield) and to the trailing equipment needed for it to operate (called the “back-up,” the services structure housing the cab, the systems’ cables, and the conveyor belt needed to extract the muck). Each TBM weights about 450 tons; with its back-up, it is approximately 100 metres long.
The TBMs are in fact mobile work site that, while they excavate, install the tunnels’ final lining. After their passage, the tunnel is complete, and substantially ready to be equipped with tracks and with the technological systems essential for the underground to run.
20.06.2017 Linda Meleo, Assessore alla città in Movimento del Comune di Roma, in visita al cantiere di Via Sannio.