| 摘要 |
A tunneling machine for boring non-circular tunnels in rock has a cutterhead rotatable about an axis parallel to the tunnel axis. The cutterhead has rollertype cutters both on the face and around a cylindrical outer periphery. The cutterhead is mounted on a cutterhead frame that is movable axially along the tunnel axis with respect to a main frame and the main frame is mounted on clamp frames removable transversely of the tunnel axis. Clamp shoes are carried by the clamp frames for engagement with the tunnel wall and hydraulic cylinders are provided both for moving the cutterhead frame along the axis of the tunnel and the main frame transversely of the tunnel axis. The tunnel is cut by moving the cutterhead forward along the tunnel axis with the face cutters lowering a distance into the tunnel. A main frame is then advanced forwardly and cross thrust means move the main frame transversely along the clamp frames so that the cutters on the cylindrical sides of the cutterhead enlarge the circular bore into an oval bore. |
