Method and tool for cleaving of rock

Details Method and tool for cleaving of rock Method and tool for cleaving of rock

E - Fixed Constructions

21

C

254/115

E21C 37/10 (2006.01) E04G 23/08 (2006.01)

Patent

CA 1187474

ABSTRACT OF THE DISCLOSURE A rock cleaving and excavating method according to which a hole is bored in rock and a cleaving rod is inserted in the hole which rod is provided with a pressure element of elastic material. By compressing the pressure element axially in the hole the pressure element is caused to expand radially and to apply to the wall of the hole a pressing force which exceeds the breaking strength of the rock and cleaves the rock. The elastic pressure element is uniformly pressed also against an uneven wall of a bore hole and produces a controlled cleaving. The cleaving tool comprises a cleaving rod connected to a power means and provided with an elastic pressure element located axially between two axially displaceable supports. The supports are displaced by means of the power means so that the supports compress the pressure element axially and force the pressure element to expand radially in a corresponding manner.

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