The TBM technology is quite similar to that of the micro-tunnelling and allows the realisation of large and long-sized tunnels in any soil typology, by means of a cutting head with the optional insertion of internal linings. The range varies from 2 m to 12 m and can be used for the laying of pipes and for infrastructures (example highway tunnels). The TBM machine is equipped with a cutting head, a guidance unit, pushing units, an electrical engine, conveyor belt for debris removal , lifting appliances for the lining units; the driving unit is next to the excavation front; directional control is performed by means of a laser system.
