Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1983-06-27
1986-10-21
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
405288, E21D 2100
Patent
active
046182900
ABSTRACT:
A precast roof bearing block, such as a mine roof bearing block, may have a substantially solid molded body provided with reinforcement. The body has an upper bearing surface and a generally parallel lower bearing surface. A lateral surface connects the upper and lower bearing surfaces. A hole passes through the body member extending from one bearing surface to the other and may be located at the central axis of the body. A first reinforcing member may take the form of an annular ring which is disposed close to the upper bearing surface and a second reinforcing member may take the form of an annular ring which is disposed close to the lower bearing surface. The body member may have a substantially frustoconical or dome shaped configuration. A modified embodiment facilitates angular positioning of the roof bolt.
REFERENCES:
patent: 1433621 (1922-10-01), Hutton
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patent: 2682152 (1954-06-01), Bierer
patent: 3111655 (1963-11-01), Kotarsky et al.
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patent: 4307979 (1981-12-01), Killmeyer
patent: 4325657 (1982-04-01), Elders
Corbin David H.
Silverman Arnold B.
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