This allows the laying of tubes of 600 – 1500mm in diameter; it is analogue to Micro tunnelling but differs from it for the absence of a cutter positioned on the drill head and for the fact that the drilling can not be directed. This technology is prevalently used for crossing railway lines and roads and is suitable for drilling limited lengths.
Its use is not feasible in the presence of rocky ground or water aquifer layers and can be conditioned in urban environments by the necessity to have a large work site area available.