E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
E21D9/10—Making by using boring or cutting machines
E21D9/1006—Making by using boring or cutting machines with rotary cutting tools
E21D9/1013—Making by using boring or cutting machines with rotary cutting tools on a tool-carrier supported by a movable boom
E21D9/1033—Making by using boring or cutting machines with rotary cutting tools on a tool-carrier supported by a movable boom by a transversely extending boom being pivotable about a longitudinal axis