Excavating machine comprising a cutting arm pivoting the digging of tunnels, of the tunnels or similar cavities

摘要

The invention relates to a selective-cut heading machine for driving tunnels and the like, having a vertically and laterally pivotable cutting boom. In order to be able to perform smooth-walled arch cuts having no steps with such a selective-cut heading machine, without the entire cutting head having to be pivotably displaced about an axis running in the direction of the longitudinal axis of the cutting arm, the two cutting drums have different outside diameters, the difference in radius between the two cutting drums having at least the following magnitude: IMAGE where r is the radius of curvature of the roadway apex arch and a is the axial centre distance of the two cutting drums. IMAGE