Crushing method using large boreholes in underwater rock
The present invention relates to a crushing method using large boreholes in an underwater rock in which plural large boreholes are drilled on the rock in a predetermined space, the drilled boreholes form plural free surfaces, and the large drop hammer gives a blow to the free surface, thus enhancing...
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Main Author | |
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Format | Patent |
Language | English |
Published |
21.11.2007
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Subjects | |
Online Access | Get full text |
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Summary: | The present invention relates to a crushing method using large boreholes in an underwater rock in which plural large boreholes are drilled on the rock in a predetermined space, the drilled boreholes form plural free surfaces, and the large drop hammer gives a blow to the free surface, thus enhancing the crushing effect. The crushing method is comprised of the following processes: plural large boreholes, of which each size is 100~300 mmphi, are arranged on the rock to be crushed, and are drilled in a depth of 1~10 m, and the free surface is reserved before the drop hammer work; a middle point between the adjoining large boreholes is set as target point; the drop hammer is lift above a position perpendicular to the target point, and is free-fallen to give a blow to the rock to be crushed; and the above processes are repeatedly operated. |
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Bibliography: | Application Number: CN200410056473 |