Patent ID: 8756885
Filing Date: 2014-06-24
Classification: E04C,Y10T

Abstract:
1. A wedge for an anchorage system for post-tensioned concrete reinforcement, the anchorage system including a tendon and an anchor having a flange with a front surface and a rear surface, the anchor having at least one wedge receiving bore, the wedge receiving bore having a tapered interior surface, the wedge receiving bore extending through the flange portion, the wedge comprising: an internal surface formed prior to contact with the tendon so as to contract as the wedge is drawn into the wedge receiving bore and engage an outer surface of the tendon; and an external surface formed prior to contact with the tapered interior surface of the wedge receiving bore of the anchor to contract as the wedge is drawn into the wedge receiving bore, the external surface so formed so as to include: wherein the internal surface includes a first section with a first taper angle, the first taper angle of the internal surface being defined by the angle between an imaginary line extending from the first section of the internal surface and the longitudinal axis of the wedge, and a second section with a second taper angle, the second taper angle of the internal surface being defined by the angle between an imaginary line extending from the second section of the internal surface and the longitudinal axis of the wedge, the first taper angle of the internal surface being less than the second taper angle of the internal surface, the first section of the internal surface being near a front side of the wedge and the second section of the internal surface being near a rear side of the wedge so as to equalize the distribution of compressive forces over the first and second sections.