Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1984-02-22
1986-07-22
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405269, E21D 2002
Patent
active
046016147
ABSTRACT:
A rockbolt for installation in a bore in the roof of an underground excavation, such as a tunnel or mine, to support the roof, comprises a sleeve having a closed top and ports in its upper end, a plunger slideably mounted in the sleeve, and hardenable binder material encapsulated in burstable cartridges in the sleeve above the plunger. The rockbolt is inserted into the bore and the plunger is operated either mechanically or by the application of pressurized fluid to the plunger, to extrude the binder material to secure the rockbolt in the bore. A mechanical anchor can be provided on the top of the sleeve so the rockbolt can be tensioned before the binder sets. Alternatively, faster setting binder can be provided in the sleeve below the balance of the binder so that it is the last to be extruded and remains near the top to secure the top to the surrounding rock before the balance of the binder sets so that the rockbolt can be tensioned before the balance of the binder sets.
REFERENCES:
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patent: 2287395 (1942-06-01), Reynolds
patent: 2849866 (1958-09-01), Flygare et al.
patent: 2950602 (1960-08-01), Lang
patent: 3308585 (1967-03-01), Fischer
patent: 3613495 (1971-10-01), Poo
patent: 4055051 (1977-10-01), Finney
patent: 4098166 (1978-07-01), Lang
patent: 4224971 (1980-09-01), Muller
patent: 4362440 (1982-12-01), Glaesmann et al.
patent: 4461600 (1984-07-01), Norkus et al.
Underground Excavations in Rock, E. Hoek & E. T. Brown.
Lane William L.
Lewis Donald L.
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