Method and apparatus for charging waterlogged boreholes with exp

Details Method and apparatus for charging waterlogged boreholes with exp Method and apparatus for charging waterlogged boreholes with exp

1989-08-30

1991-04-16

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

102312, 86 2015, 166 63, 299 13, F42B 300

Patent

active

050073451

ABSTRACT:
A method of charging waterlogged boreholes with water-resistant particulate explosive material, comprises inserting a pneumatic line with upwardly directed nozzles at the lower end thereof and a material supply line into a borehole, blowing compressed air through the pneumatic line such that at least a portion thereof is directed through the nozzles to form a substantially water-free air pocket around the lower end of the supply line, supplying particulate explosive material through the supply line to a charging zone in the vicinity of the lower end thereof, and gradually withdrawing said line as the borehole fills up with explosive material.

REFERENCES:
patent: 3921497 (1975-11-01), Christmann et al.
patent: 4003429 (1977-01-01), Hay et al.
patent: 4572075 (1986-02-01), Day et al.

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