Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1986-12-22
1988-10-04
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, E21D 2000
Patent
active
047752661
ABSTRACT:
Structure and method for deterring cutter roof failure in underground mines such as coal mines. An elemental device of such structure comprises a unique bracket accommodating angulated bolting and having end-apertured flanges suitable for accommodating mutually horizontal tie rods disposed in tension. A series of the bracket devices are mutually spaced end-to-end and are longitudinally aligned parallel and generally proximate to a rib-roof juncture. Connecting tie rods intercoupling the bracket devices, are disposed in tension and, because of such, the roof strata proximate the roof-rib edge is placed longitudinally in compression. Truss support structures incorporating a plurality of devices can be made up to support and place in compression in large roof areas to deter roof failure. The method involved, for deterring cutter roof failure, is to provide, in one form of the invention, the said bracket devices and then anchoring the same over, e.g., the pillar areas and joining the bracket devices together lying essentially parallel to rib-roof junctures along an elongate path.
REFERENCES:
patent: 4456405 (1984-06-01), Galis
patent: 4498816 (1985-02-01), Korpela et al.
patent: 4596496 (1986-06-01), Tyrell et al.
patent: 4601616 (1986-07-01), Barish et al.
patent: 4630974 (1986-12-01), Sherman
patent: 4679967 (1987-07-01), Hipkins et al.
Cutter Roof Failure: An Overview of the Causes and Methods for Control, Bureau of Mines Information, circular IC 9094 (1986) by John L. Hill III, published by the United States Department of the Interior.
Corbin David H.
Shaffer M. Ralph
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