Cartridge for rock-bolting

Details Cartridge for rock-bolting Cartridge for rock-bolting

1979-05-22

1982-07-06

Lieberman, Allan

Hydraulic and earth engineering

Earth treatment or control

Chemical

106 74, 106 76, 106 83, 106 84, 106 96, 10628723, 206219, E21D 2000, E21D 2002

Patent

active

043380484

ABSTRACT:
A frangible cartridge for anchoring a reinforcing element such as a rock-bolt in a borehole drilled in rock strata, for example an underground mine roof, contains as separate constituents (A) an aqueous liquid and an alkali metal silicate and (B) a gelling agent for the alkali metal silicate, the gelling agent being capable of forming a gel from the alkali metal silicate when brought into contact therewith as a result of the reinforcing element being caused to break the cartridge and mix together the constituents (A) and (B) within the borehole so as to form a grouting composition around the reinforcing element, the grouting composition when hardened serving to anchor the reinforcing element in the borehole. In a preferred embodiment, a hydraulic substance such as a hydraulic cement is incorporated in constituent (B) and is hardened by the aqueous liquid present in constituent (A) when the contents of the cartridge are mixed by the reinforcing element. The cartridge of the invention is safer for use, particularly in coal mines, than the conventional resinous cartridges.

REFERENCES:
patent: 215397 (1879-05-01), Rollins
patent: 2896280 (1959-07-01), Ilenda et al.
patent: 3294563 (1966-12-01), Williams
patent: 3493406 (1970-02-01), Fillet et al.
patent: 3558506 (1971-01-01), Bonnel et al.
patent: 3970462 (1976-07-01), Stillman
patent: 3986998 (1976-10-01), Schmitt et al.
patent: 3990903 (1976-11-01), Mallow
patent: 4096944 (1978-06-01), Simpson
patent: 4126005 (1978-11-01), Coursen
patent: 4136774 (1979-01-01), Ghoshal
Chem. Abst. 81:50,732h, 1974; 83:209,056f.

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