Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1980-08-25
1982-09-14
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, E21D 1100, E04C 512
Patent
active
043493009
ABSTRACT:
Support for native roof strata in a mine opening includes an elongated tensile member arranged horizontally and immediately below the lowest stratum layer of the native roof strata. The tensile member is anchored with bolt members under a prestressed elongation at a site within the upper stratum and horizontally remote to the roof strata to impose the prestressing reactive forces upon the upper stratum as a compressive stress. The emplaced tensile member distributes an upward force upon the roof strata to shear resistance by increasing friction between the layers of the strata. The bolt members extend over a pillar of native strata at an angle of between 0.degree. and 30.degree. to the horizontal, preferably about 5.degree. to 15.degree.. In one embodiment, a profiled spacer is used between the tensile member and the lowest stratum layer for creating the increased friction between the layers of native roof strata. When the tensile member takes the form of a tensile skin strip, then roof bolts are used to bind the tensile skin to the lower stratum layers for creating increased friction therebetween. When the tensile member has an arch-shaped configuration, it is arranged with the curved ends extending downwardly from the lowest roof stratum layer. The arch-shaped elastic member is prestressed by directing a force upon each of the curved ends to compressively stress the elastic member against the roof strata where it is anchored by the bolt members.
REFERENCES:
patent: 1559560 (1925-11-01), Doughty
patent: 3216306 (1965-11-01), Taylor
patent: 3427811 (1969-02-01), White
patent: 3509726 (1970-05-01), White
patent: 4091628 (1978-05-01), Kelley
Murray Thomas H.
Poff Clifford A.
Taylor Dennis L.
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