Anchor bolt, anchor, connecting nut and clamping nut

摘要

An anchor bolt comprising: a shaft part with a male screw thread; and a head part connected to the shaft part and having an attachment hole with a closed-end bottom to receive a bolt therein defined at a tip surface of the head part and a breaking groove provided at an outer side surface of the head part. The breaking groove is formed at an outer surface of a portion in which the attachment hole is defined. A torque equal to or greater than a fixed value exerted on a tip portion between the tip surface and the breaking groove of the head part causes the breaking groove to be broken, thereby causing the tip portion between the tip surface and the breaking groove of the head part to be removed.

主权项

1. An anchor bolt comprising:
a shaft part with a male screw thread; and a head part connected to said shaft part and having an attachment hole with a closed-end bottom to receive a bolt therein defined at a tip surface of said head part and a breaking groove provided at an outer side surface of said head part, wherein said breaking groove is formed at an outer surface of a portion in which said attachment hole is defined, a torque equal to or greater than a fixed value exerted on a tip portion between the tip surface and said breaking groove of said head part causes said breaking groove to be broken, thereby causing the tip portion between said tip surface and said breaking groove of said head part to be removed, said head part has a diameter reduction section having an inner diameter that reduces at a predetermined depth in said attachment hole from the tip surface, and a screw hole section with a female screw thread provided at a bottom portion between said diameter reduction section and a bottom portion in said attachment hole, and said breaking groove is placed at a predetermined position between the tip surface and the portion in which said diameter reduction section is formed.