E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
262/67
E02F 1/00 (2006.01) E21D 13/00 (2006.01)
Patent
CA 2031615
27243-53 ABSTRACT The present invention relates to a method for ex- cavating substantially spherical rock cavities or rock cavities having spherically shaped parts, such as dome-shaped ceilings. A first series of radially outwardly extending holes is drilled from a first distance from one or more shafts/tunnels preferably radially arranged from the centre of a sphere. A second series of radially outwardly extending holes is drilled from a second distance arranged further from the centre, the second holes extending beyond the holes of the first series. A third series of radially outwardly extending holes is then drilled from a third distance arranged still further from the centre. The third holes extending beyond the second holes. Optionally further series of holes may be drilled from further locations still further removed from the centre in an analogous fashion. The first series of holes is charged along their whole lengths and each further series of holes is charged in that part which lies outside a charging area of a previous series of holes up to the touching point of a next series of holes. In this way, the charges will take consecutive annular charging areas, which cover the shape of the spherical cavity projected, and that blasting takes place only in each annular area.
Svensson Kurt
Fetherstonhaugh & Co.
Kurt Svensson Gravmaskiner Aktiebolag
Svensson Kurt
LandOfFree
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