Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1995-06-22
1997-07-22
Graysay, Tamara L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
405244, 4052591, E02D 2750, E21D 2000, E21D 2100
Patent
active
056497903
ABSTRACT:
An apparatus for securing the rock formation of a structure, such as in the walls and ceiling of a mine shaft includes a forward portion having a given diameter and length and cross section and a larger diameter rear portion also having a given diameter and length and cross section. A tapered conical portion is attached between the forward portion and the rear portion thereby serving as a smooth interface therebetween. A slit, having a predetermined width gap, runs the full length of the apparatus and an annulus is provided that is attached to the rear portion to engage a mine shaft plate. To insert the apparatus into the formation, a first larger diameter hole is drilled into the formation approximately equal to or slightly in excess of the length of the rear portion. A second smaller diameter hole is then drilled along the same axis to an overall depth which equally or exceeds the length of the apparatus. The mine shaft plate is then placed over the apparatus before it is inserted into the drilled holes. When resistance is encountered it is driven fully into the holes until the mine shaft plate bears upon the formation.
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Mergen Douglas Matthew
Vilhauer Dean Allen
Graysay Tamara L.
Mayo Tara L.
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