Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1985-12-16
1987-10-13
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, 411538, E21D 2100
Patent
active
046995471
ABSTRACT:
A method of essentially maintaining the integrity of mine floors and precluding floor heave, this without the necessity of incorporating timber cribs, jacks and so forth, as utilized in the prior art. Floor integrity is maintained with a minimum of obstruction of the mine opening. Truss structures herein are designed to deter floor heave and, optionally, also may be adjusted in certain instances for employment as roof trusses even though stress patterns of the strata will differ. Truss-bracket, channel, and allied constructions are incorporated and are of advantageous design as hereinafter pointed out. Of special import is the bracket, of nominal triangular cross-section which facilitate through-placement of tie rods and anchor bolts in tension and in a manner deterring the generation of force couples. The truss structures will be installed between mine pillars, broadly defined as any side structure, rock or otherwise, spanned by a mine- or tunnel-roof.
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Evaluation of Roof Trusses, Phase 1 Dept. of Civil Engineering, Univ. of Pittsburgh, Feb. 28, 1979, prepared for United States Dept. of the Interior-Bureau of Mines.
Shaffer M. Ralph
Taylor Dennis L.
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