| 摘要 |
The invention relates to an anchor bolt having a shank, a screw-threaded portion at one end of the shank, an essentially flat bevelled portion in the shank, the depth of the bevelled portion perpendicular to the bolt axis being decreasing in the direction of the shank end opposite to the screw-threaded end. A shiftable member is mounted on the bevelled portion and is movable away from the bolt with respect to the bolt axis during relative displacement of the shiftable member and the bolt. The shiftable member cooperating with the bevelled portion is a flat plate, and the cross-sectional area of said bolt at the position of the maximum depth of said bevelled portion is greater than the cross-sectional area of the core of the screw-thread. The flat plate is polygonal in cross-section and at least one corner of the flat plate projects from the cylindrical circumference of said bolt shank.
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