Anchor for concrete post-tension anchoring

An anchor for a concrete post-tension system including the anchor, a tendon having a longitudinal axis and a first diameter with at least one portion of the tendon being exposed and at least another portion of the tendon being encased in sheathing having a second diameter, and a plurality of wedges, each wedge having a height, a substantially semi-circular inner surface adapted to engage the exposed portion of the tendon and an outer surface with constant outer angle of taper with respect to the longitudinal axis, the anchor comprising:

• a generally rectangular bearing plate portion having a upper surface and a generally flat lower surface defining a bearing plane;
• a barrel portion having an upper annular wall extending from the upper surface of the bearing plate and a lower annular wall depending from the lower surface of the bearing plate, the inner surfaces of the upper annular wall and lower annular wall together defining an internal wedge-receiving cavity passing through the bearing plate and having a central axis substantially perpendicular to the bearing plane;
• the wedge-receiving cavity having a fixed angle of taper with respect to the central axis such that the diameter of the cavity is constantly diminishing from the upper end of the barrel to the lower end of the barrel, the cavity having a diameter at the lower end that is at least as great as the diameter of the sheathing on the tendon to be anchored, and the cavity having an overall height measured from the upper end of the barrel to the lower end of the barrel that is at least as great as the height of the wedges to be used;
• the outer surface of the upper annular wall being upwardly tapered such that the outside diameter of the wall decreases from the upper surface of the bearing plate to the upper end of the barrel;
• the outer surface of the lower annular wall being downwardly tapered such that the outside diameter of the wall decreases from the lower surface of the bearing plate to the lower end of the barrel;
• and
• a plurality of webs extending from the outside of the upper annular wall to the upper surface of the bearing plate;
• whereby the sheathed portion of the tendon may freely pass through the wedge-receiving cavity of the anchor, and when an exposed portion of the tendon is positioned within the cavity, the wedges may be inserted to produce an interference fit relationship between the inner surfaces of the cavity and the exterior surface of the tendon.