Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1979-01-26
1981-12-15
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
E21D 2002
Patent
active
043056873
ABSTRACT:
An anchoring system for rock bolts which support and reinforce rock structures, primarily roof structures in underground mines. The anchoring system involves the coaction of: (1) a hardenable grout such as a synthetic resin; and (2) a simple but specially designed rock bolt which has a frustum or wedge portion or element at its inner end. In this system, the wedge is secured to or forms a part of the rock bolt and the bolt is anchored by the direct mechanical action of the wedge against the hardened grout, with the wedge causing the grout to be placed under compression as the wedge slides through the grout. The anchoring is accomplished without changing the position of movable mechanical parts and without grouting along the entire length of the rock bolt. The rock bolt anchoring system is used by drilling a hole in a rock formation, introducing into the hole an anchoring amount of a hardenable grout in an amount which is sufficient to fill the hole in the zone occupied by the anchoring wedge but which is substantially less than the amount of grout required to grout the entire rock bolt, simultaneously or subsequently inserting the specially designed rock bolt into the hole, permitting or causing the grout to harden in the hole while the grout is in contact with the wedge shaped portion of the rock bolt, and then imparting tensile forces to the rock bolt by tightening the rock bolt against a suitable bearing plate or other restraining device located at or near the outer end of the rock bolt.
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