Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1981-09-08
1983-06-07
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405260, E21D 2100
Patent
active
043868770
ABSTRACT:
Mine roof bolting using an anchoring fastener comprising a bolt having a head at one end and screw-threaded at said one end, and a nut threaded on the bolt engageable with the head. On turning the nut in one direction, it moves along the bolt away from the head. On turning the nut in the other direction, it moves toward the head until it engages the head, at which point further rotation of the nut in said other direction turns the bolt in that direction. In the use of the fastener, a hole is drilled up in the mine roof, a supply of a two-component resin in the unmixed, unhardened condition is inserted in the bore, a portion of the fastener is inserted in the bore so that the headed end and the nut are outside the bore, the nut is rotated in said other direction so that it engages the head and is rotated further so that the bolt is rotated in the bore to mix the two components of the resin, the resin is allowed to harden and the nut is rotated in said one direction to move the nut into pressing relation with the mine roof.
REFERENCES:
patent: 3940941 (1976-03-01), Libert et al.
patent: 3979918 (1976-09-01), Vidler
patent: 4051683 (1977-10-01), Koval
patent: 4179861 (1979-12-01), Brown
Peabody Coal Company
Taylor Dennis L.
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