High pressure water jet channeling horizontally into a solid mou

Details High pressure water jet channeling horizontally into a solid mou High pressure water jet channeling horizontally into a solid mou

1996-05-22

1998-06-16

Bagnell, David J.

Mining or in situ disintegration of hard material

Processes

Forming blocks

239101, 299 17, F21C 2560

Patent

active

057659249

ABSTRACT:
A method and apparatus for horizontal channeling into a mountain of granite automatically have been developed in which a water jet nozzle contained in a rigid lance assembly advances in and out of the mountain to the depth of the lance in a horizontal plane along a line of cut predetermined by the setup of the apparatus and the original drilled hole. The jet oscillates back and forth in a transverse fashion, cleaving the crystal formation of the granite through the application of high pressure water pulsing at the appropriate angle of penetration to achieve the correct spalling of the granite surface in slightly upward direction such that the channel remains free of chips and grit for easy movement of the feed system. The machine advances incrementally just prior to the lance entering the channel, maintaining standoff distances to properly erode channel corners. When the desired length of horizontal cut is reached, the lance is rotated upward ninety degrees, proceeding in and out in an upward motion until the desired height of block is reached. Four sides of the block are relieved in this manner, completing a square pattern which can easily be split out of the mountain. The angle of penetration, speed of oscillation and travel are varied to achieve a maximum efficiency depending on the type of granite that is being cut.

REFERENCES:
patent: 4111490 (1978-09-01), Liesveld
patent: 4176883 (1979-12-01), Liesveld
patent: 5332293 (1994-07-01), Higgins et al.

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