Charging large diameter vertical boreholes

Details Charging large diameter vertical boreholes Charging large diameter vertical boreholes

1984-05-07

1985-06-11

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

86 20C, 102312, 102324, 166 63, 299 13, F42B 300

Patent

active

045221251

ABSTRACT:
A method of charging upwardly extending, large diameter boreholes with cylindrical explosive cartridges is provided employing a longitudinally inflating flexible tube as the pushing mechanism. A fluid-impervious flexible tube is turned over or everted at one end and secured. A fluid, preferably air, at about 3 psi is passed into the tube causing the tube to elongate and the everted tube face to travel along the length of a borehole. An explosive cartridge mounted against the tube face is carried to a desired location in the borehole after which the tube is partly deflated and withdrawn from the borehole.

REFERENCES:
patent: 2745346 (1956-05-01), Aitchison et al.
patent: 3087425 (1963-04-01), Griffith, Jr.
patent: 3361023 (1968-01-01), Collins et al.
patent: 3949673 (1976-04-01), Lyerly
patent: 3986430 (1976-10-01), Coursen et al.

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