Patent ID: 8287051
Filing Date: 2012-10-16
Classification: E21B,E21C

Abstract:
1. A method of quarrying dimensional stone, the method comprising: drilling a plurality of drill holes in a rock or a stone block in at least one drill hole line, at a desired hole spacing from each other; using a line drilling apparatus for the drilling, which comprises at least one boom provided with at least one drilling unit, which, in turn, comprises a rock drilling machine, a feed beam and a feeding apparatus; positioning the drilling unit in the drill hole line by means of the boom from a drilled drill hole to a drill hole to be drilled next; detaching a dimensional stone block after the drilling from a position determined by the drill hole line; using a line drilling apparatus comprising a first boom, a second boom, a substantially horizontal first joint between the booms and a substantially horizontal second joint between the second boom and the drilling unit; supporting a stone support between the first boom and the second boom against the stone; performing positioning of the line drilling apparatus to the vicinity of a drill hole line so that the first joint and the second joint are in perpendicular alignment relative to the drill hole line to be drilled and keeping this position unchanged until the drilling is completed; performing a fine positioning of the line drilling apparatus by simultaneously moving the second boom and the drilling unit coupled thereto in a linear direction relative to the first boom; performing positioning of the drilling unit between the drill holes belonging to the drill hole line by turning the second boom around the first joint, whereby the second boom moves only in the direction of the drill hole line and the drilling unit in the second boom turns along an arched motion path; and adjusting the position of the drilling unit, at each drill hole to be drilled, relative to the object to be drilled by turning the drilling unit relative to the second joint.