DRILLING METHOD FOR ANCHOR BOLT OF STEEL PLATE LINING

PROBLEM TO BE SOLVED: To constitute no obstacle to injection filling of coagulating reinforcing agent by drilling a hole for temporary stopping by an anchor bolt with a ring- like spacer interposed between a steel plate and a concrete structure. SOLUTION: In case of lining steel plates 3, 3 for earthquake resisting reinforcement in a region of a concrete structure 1 where the generation of cracks due to an earthquake is estimated, a drilled hole 9 for temporarily stopping by an anchor bolt is provided in a designated region of the steel plate 3. At this time, a ring-like space formed of resin elastic material such as soft plastic, foam styrol is set between the steel plate 3 and the concrete structure 1 of the drilled region by adhesion. Whereupon, cuttings 10, 10 produced by formation of the drilled hole 9 can be prevented from dropping in a gap 11 produced between the outer surface of the concrete structure 1 and the inner surface of the steel plate 3. Thus, it causes no obstacle to injection filling of a coagulating reinforcing agent such as resin or the like in the subsequent process.