DEVICE FOR ENLARGING A TUNNEL AND METHOD FOR ENLARGING A TUNNEL

摘要

The present invention relates to a device and a method for widening a tunnel from an old inner jig delimited by an old tunnel vault to a new inner jig, according to which consolidation plates (12, 13) movable in the direction axial are present on a new internal template, said plates consolidating the old tunnel vault in a disassembly zone to prevent it from detaching prematurely or undesirably during operation temporarily on a track or two lanes. This provides an effective broadening.