Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1985-11-14
1987-05-19
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405259, 411452, 411478, E21D 2002
Patent
active
046663452
ABSTRACT:
An elongate hollow rock bolt, bolt installations, and process of effecting the same, wherein the bolt is slightly over-size relative to the transverse cross-section of the mine roff hole or aperture in which the bolt is to be installed. The bolt has a radial, transverse polygonal cross-section formed by contiguous deflectable resilient sides provided with outwardly directed fins, the latter being tapered. When the bolt is impact-forced into a mine roof aperture, the fins are forced inwardly, deflecting the bolt sides which, owing to their resiliency, maintain the fins and the aperture wall areas contacting the same under compression, thus increasing the holding effect upon the bolt. The latter may be grouted in, and also may have a pre-installed bearing plate provided with an aperture and slide-slots accommodating the fins.
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patent: 3196583 (1965-07-01), Rex et al.
patent: 3415153 (1968-12-01), Steiner
patent: 3653217 (1972-04-01), Williams
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patent: 4087928 (1978-05-01), Mickus
patent: 4098087 (1978-07-01), Swain
patent: 4284379 (1981-08-01), Chaiko
patent: 4502818 (1985-03-01), Elders
Shaffer M. Ralph
Taylor Dennis L.
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