EXPANDED SET ANCHOR

摘要

The present invention provides a set anchor with an expandable end, which allows the end of the anchor bolt to evenly expand in order to prevent wobbling caused by a horizontal force and improve fixing power for pullout resistance. According to a proper embodiment of the present invention, the set anchor comprises an anchor bolt which includes an axis unit having a male screw part, an end expansion unit whose sectional area gradually expands due to ground pressure angle to the outer circumferential surface of the end of the axis unit, and a circular concave groove having a circular shape formed on the center of the end surface of the end expansion unit in order to form a cone shape to evenly distribute ground force around the circumference of the center of the end of the end expansion unit by wedge expanding concave angle; a cone wedge which is forcibly inserted into the circular concave groove of the anchor bolt to evenly expand the circumferential surface of the end expansion unit in the radial direction; and a load fixing sleeve inserted into the axis unit of the anchor bolt to come in forcible contact with the end expansion unit. The end expansion unit is treated by heat and expands at expansion angle consisting of ground pressure angle and wedge increasing concave angle.