PROBLEM TO BE SOLVED: To provide a hole-in anchor instrument which can prevent pull-out of a body from a concrete skeleton and loosening of a bolt, can change a bolt length after a hole-in anchor has been placed, and is excellent in flexibility of construction.;SOLUTION: A hole-in anchor instrument 1 has a cylindrical body 3 having an expanding piece 32 in a front portion, an approximately truncated cone shaped cone 4 that has a female screw 42 formed therein and at least a rear end of which is placed inside of the body 3, and a fitting bolt 5 that is inserted to the body 3 and where a male screw 51 is threadingly fitted to the female screw 42 of the cone 4, where a partially projecting plate spring 44 is provided on a female screw hole 41 in the vicinity of a tip of the female screw 42 of the cone 4, and the plate spring 44 is hooked in the vicinity of a tip of the male screw 51 of the fitting bolt 5.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2018,JPO&INPIT
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