E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/31
E21B 7/02 (2006.01) E21B 19/24 (2006.01) E21B 47/02 (2006.01) G01C 7/06 (2006.01)
Patent
CA 1217473
Abstract of the Disclosure A method of positioning a drilling apparatus with respect to a drilling plane formed by holes to be drilled in a rock in a tunnel, according to which method a base (3) of the drilling apparatus (1,2) is moved to the place of the drilling plane and is positioned on the basis of two marks (20) made on the rock by developing light beams (18), which point in opposite directions and are stationary with respect to the drilling apparatus and by directing each light beam towards one of the marks (20) by adjusting the base (3) in a horizontal plane. In an arrangement for carrying out the method the drilling apparatus comprises a base (3) provided with a coupling means for coupling to a transport vehicle (2) and a drill rig (4,5,13) supported by the base. The apparatus is provided with stationary mounted light sources (17) sending narrow light beams (18) in opposite directions. The coupling means forms a pivoting joint enabling the base to pivot with respect to the transport vehicle around a vertical axis (D) for turning the light beams in desired directions. (Figure 2).
461441
Hyvonen Pentti
Rajakallio Pauli
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Oy Tampella Ab
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