TBM pilot drive for 1.2 km-long bi-directional NATM road tunnel completed at rates up to 2 m/h by Subterra for FCC using Wirth 4.5 m-diameter TB 390/420E owned by Murer in Devonian hornfels and shales with two granodiorite sections of UCS 125 Mpa and RMR 50-65. TBM will now mine parallel emergency exit tunnel. Full report in Tunel 2/2002. Visit www.subterra.cz and www.wirth-europe.com 28/02.
