Method and device for breaking hard compact material such as...

Details Method and device for breaking hard compact material such as... Method and device for breaking hard compact material such as...

E - Fixed Constructions

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C

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E21C 37/12 (2006.01) B26F 3/00 (2006.01)

Patent

CA 1114405

T I T L E METHOD AND DEVICE FOR BREAKING HARD COMPACT MATERIAL SUCH AS ROCK ABSTRACT OF THE DISCLOSURE A hard compact material such as rock is broken by directing a high velocity jet of relatively incompressible fluid, such as water, into a hole which is drilled in the material to be broken. The jet is generated by a nozzle in alignment with the hole and is suddenly arrested in the hole in appropriate position with respect to adjacent free surfaces of the material. A jet stagnation pressure is created to the hole of sufficient magnitude and duration or jet repetion rate to break the material towards the free surfaces. Preferably, a second- ary nozzle emits fluid for filling partially or wholly the hole prior to generating the high velocity jet by a primary nozzle.

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