METHOD OF FIXING OF ANCHOR BOLT AND DESIGN OF ANCHOR BOLT FOR METHOD EMBODIMENT Russian patent published in 2001 - IPC

FIELD: bolding of mine workings. SUBSTANCE: method includes preparation and introduction into borehole of load- carrying rod and cartridge with loose mineral filler down to borehole bottom; thrusting of loose material in gap between borehole walls and load-carrying rod, anchor bolt head and supporting washer by rotation of rod; preliminary tensioning of anchor bolt by screwing back nut onto threaded end of shank of anchor bolt rod. Preparation is carried out by introduction of cartridge into borehole with subsequent pushing of its end to stop against borehole bottom by load-carrying rod with supporting washer which, prior to pushing of cartridge is supported by temporary stop resting with its opposite end on supporting members of anchor bolt rod. After pushing is over, stop is removed from borehole. Loose mineral filler is thrusted by screwing of load-carrying rod into cartridge by its rotation with simultaneous feed toward bottom of borehole and breakage of cartridge shell. Anchor bolt includes load-carrying rod with head, supporting washer, stop, bushing from mineral filler in gap between borehole walls and rod in lock part, shank with thread, supporting members and nut. In has head in from of heavy screw having one-sided ragged surface and screwed into loose mineral filler. End face of road-carrying rod is beveled at acute angle. Supporting washer rests on borehole walls, for instance, by its external diameter and is made in form on borehole walls, for instance, by its external diameter and I made in form of bushing with flanges for relative motion of load-carrying rod whose shank and nut are made with radial hole in which shear pin is installed. EFFECT: higher reliability of anchor bolt fixing, reduced labor input and time for anchor bolt preparation for its fixing. 2 cl, 4 dwg