In the shaft at Largo dell’Amba Aradam it was necessary to carry out compensation grouting measures envisaged for supervisory works to protect the Aurelian Walls at the point affected by the underground journey of the TBM.
The excavation of about 8,5 metres in diameter has reached a depth of about 19 metres, supported by plastic poles around the perimeter, in order to consolidate the ground and with the purpose of hydraulically isolating the interior of the excavation from the outside.
The construction of the shaft took place through progressive downward excavations sustained by HEB 180 ribs installed at distances of 2/3 metres and the subsequent setting up of spritz beton in order to regularize the excavation walls.
The excavation of this shaft has brought to light an interesting archaeological stratigraphy of contemporary, modern, early medieval and late antique eras, including the installations of a building of the Trajan era, (end of 1st and beginning of the 2nd century) and where three rooms were found.
This building underwent major alterations in the Hadrianic era (1st half of the 2nd century) and again later, around the beginning of the 3rd century, when probably around the middle of this century it was engulfed by a violent fire which caused its collapse.
The interest of this discovery, apart from the fact that ancient wooden floors in Rome have never before been preserved, lies in its possible interpretation. The current hypothesis is that these rooms are connected to the military complex (barracks) recently brought to light just outside the Aurelian Walls during the excavation for the construction of the Amba Aradam-Ipponio Station.