Arrangement for forming vertical or steeply inclined shafts

Details Arrangement for forming vertical or steeply inclined shafts Arrangement for forming vertical or steeply inclined shafts

1977-01-31

1979-01-02

Staab, Lawrence J.

Tool driving or impacting

Processes

173 43, 175 53, 299 10, E21C 2300

Patent

active

041322762

ABSTRACT:
A stopping apparatus is suspended in a pilot shaft and blasting charge holes are drilled outwardly and downwardly from successive vertical positions from the bottom to the top of the pilot shaft to provide a circular array of holes fanned-out from each vertical position. The blasting charge holes are loaded with blasting charges, and detonated, proceeding from the bottom to the top of the pilot shaft.

REFERENCES:
patent: 2143848 (1939-01-01), Gilman
patent: 2176885 (1939-10-01), Cadwallader
patent: 2373276 (1945-04-01), Thornley
patent: 2731235 (1956-01-01), Dellner
patent: 2823899 (1958-02-01), Bain
patent: 2980372 (1961-04-01), O'Leary
patent: 3085794 (1963-04-01), Johansson et al.
patent: 3113627 (1963-12-01), Ginocchio
patent: 3302976 (1967-02-01), Grant
patent: 3305272 (1967-02-01), Zhadaev et al.
patent: 3471888 (1969-10-01), Grant et al.

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