Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1984-09-25
1986-08-26
Husar, Cornelius J.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405259, 411 5, 411 11, E21D 2002, E21D 2100, F16B 3304
Patent
active
046079840
ABSTRACT:
An apparatus and method for anchoring a bolt in a rock formation is disclosed, and includes a rebar assembly adapted for use in a bore hole and an elongated bolt threadedly engaged to the end of the rebar. A threadable sleeve is securely affixed in an orifice, forged in the end of the rebar, at a predetermined point adjacent the orifice threaded portion. The end of the bolt abuts the sleeve upon assembly, thereby causing the bolt and the rebar assembly to rotate together upon application of a torque to the bolt. This rotational movement effects mixing of bonding material which is placed in the bore hole ahead of the rebar assembly. As the mixed bonding material begins to harden, rotation of the rebar assembly is resisted. Upon application to the bolt of a torque in excess of a predetermined torque, the bolt will thread the sleeve located in the rebar orifice by cutting threads therein, thereby causing relative rotational movement between the rebar and the bolt. the resin mixture then bonds the rebar assembly to the rock formation, thereby resisting downward movement of the rebar and allowing the bolt to be tensioned upon further rotation.
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Husar Cornelius J.
Republic Corporation
Stodola Nancy J.
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