Crushing method using large boreholes in underwater rock

Details Crushing method using large boreholes in underwater rock Crushing method using large boreholes in underwater rock

2006-04-25

2006-04-25

Kreck, John (Department: 3673)

Mining or in situ disintegration of hard material

Processes

C299S095000

Reexamination Certificate

active

07032978

ABSTRACT:
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 mmφ, 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.

REFERENCES:
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patent: 2212993 (1999-02-01), None
patent: 199245 (1923-06-01), None
patent: 204544 (1923-10-01), None
patent: 222099 (1925-06-01), None
patent: 2172030 (1986-09-01), None

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