After construction anchor, anchor construction tool and construction method

摘要

PROBLEM TO BE SOLVED: To provide a hole-in anchor that does not cause a bend or bent rupture in a bolt near a surface of an anchor construction surface and that enables easy and efficient construction.SOLUTION: A hole-in anchor 1 includes: a shaft member 2 that has a first shaft part 21 provided on a tip side and that has a second shaft part 22 provided on the other end side; an expansion sleeve 6 that is configured in an approximately cylindrical shape capable of being inserted into the first shaft part 21 and that has an outward expanded expansion part 63 provided on the tip side; a cone nut 7 that has an outside diameter gradually reduced along an axial direction of the shaft member 2, the inside of which has a through screw hole 71 for being screwed to the first shaft part 21, and which is attached to a tip of the first shaft part 21 in the state of having a small-diameter end fitted into a tip part of the expansion sleeve 6; a reinforcement member 3 that comprises a long nut 31 for being screwed to the second shaft part 22; a head nut 4 that is fixed to an end 2b of the second shaft part 22 in the state of making the reinforcing member 3 screwed and fitted to the second shaft part 22; and an annular fracture groove 43 that is formed on the head nut 4 or the second shaft part 22.