Anchor for post tensioned concrete reinforcement
The present invention relates to an anchor ( 10 ) for post tensioned concrete reinforcement comprising a base member ( 14 ), a rear tubular portion ( 22 ), a front tubular portion ( 24 ), reinforcing ribs ( 42 ), and four mounting holes ( 56 ). The square plate shaped base member ( 14 ) facilitates uniform distribution of load on the concrete surface. The base member ( 14 ) has rounded corners to minimize stress concentration. The rear tubular portion ( 22 ) and front tubular portion ( 24 ) protrude from the base member ( 14 ) in opposite directions forming a through tubular section ( 30 ). The rear tubular portion ( 22 ) receives the tendon ( 34 ) to extend into the inner cavity of the tubular section ( 30 ). The front tubular portion ( 24 ) has a tapered inner cavity that receives a conventional tapered wedge ( 32 ). The tapered wedge ( 32 ) is tightened, which forces it against the sides of the tapered inner cavity, clamping the tendon in place. The reinforcing ribs ( 42 ) extend radially outward from the exterior of the front tubular section ( 24 ) on the front surface ( 16 ) of the base member ( 14 ). The anchor ( 10 ) is light weight, cost effective and easy to manufacture and handle on account of increased strength and less material requirement. The mounting holes ( 56 ) allow the anchor ( 10 ) to be secured to the concrete surface with nails ( 58 ). This arrangement allows the anchor ( 10 ) to be oriented in any direction, which provides flexibility in installation.
1 . An anchor ( 10 ) for post tensioned concrete reinforcement comprising:
a base member ( 14 ) shaped substantially as a square plate having a thickness (t) to facilitate uniform distribution of a load on a concrete surface and said base member being chamfered at the corners to a rounded shape to minimize stress concentration;
said base member ( 14 ) having a front surface ( 16 ), a rear surface ( 18 ), and an edge surface ( 20 ) extending between the front surface and the rear surface;
a rear tubular portion ( 22 ) protruding rearwardly from the rear surface ( 18 ) of said base member ( 14 ); and
a front tubular portion ( 24 ) protruding frontwardly from the front surface ( 16 ) of said base member ( 14 ):
wherein the front tubular portion ( 24 ) and rear tubular portion ( 22 ) have a common axis thereby forming a through tubular section ( 30 ) perpendicular to both the front surface ( 16 ) and rear surface ( 18 ) of said base member ( 14 ) such that an inner cavity of said through tubular section ( 30 ) tapers linearly with a maximum inner diameter (D) being at a farthest plane parallel to front surface ( 16 ) on the front tubular portion ( 24 ) and a minimum inner diameter (D) being at a farthest plane parallel to the rear surface ( 18 ) on the rear tubular portion ( 22 ), to facilitate receiving of a conventional tapered wedge ( 32 );
wherein the height of said through tubular section ( 30 ) is at least as great as that of said conventional tapered wedge ( 32 ) and the minimum diameter (D) of the through tubular section is at least as great as that of a diameter of the sheathing on a tendon ( 34 ) to be anchored;
reinforcing ribs ( 42 ) extending radially outward from an exterior of the front tubular portion ( 24 ) on said front surface ( 16 ) to facilitate the transfer of the load uniformly in all direction on the concrete through said base member ( 14 );
four mounting holes ( 56 ) near each of four corners of said square plate shaped base member to secure said base member via nails ( 58 ) through said holes perpendicular to the front and rear surface to allow flexibility of spatial orientation of the anchor and to reduce the specific weight carried by each nail in turn reducing the lateral expansion and thickness of base member;
wherein the said tapered wedge ( 32 ) cams against the inner cavity of the said through tubular section ( 30 ) to clamp down on the tendon ( 34 ) that extends into the inner cavity of said through tubular section ( 30 ) from the opening in a rearward protrusion direction where the diameter of the tapered cavity of the through tubular section ( 30 ) is at a minimum;
wherein the number of such radially extending reinforcing ribs ( 42 ) is eight for uniform distribution of forces, and each reinforcing rib is uniformly constructed and spaced at an equal distance to each other, and wherein the ribs converge toward said front tubular portion ( 24 ) and each of their imaginary inward extensions converge to a point on the axis of said front tubular portion ( 24 ) that is spaced forward of a planar surface ( 28 ) and the edge surface.
2 . The anchor ( 10 ) for post tensioned concrete reinforcement as claimed in claim 1 , wherein the thickness of said base member is from 0.21 to 0.24 inches.
3 . The anchor ( 10 ) for post tensioned concrete reinforcement as claimed in claim 1 , wherein the flexibility of spatial orientation of said anchor specifically includes horizontal, vertical or diagonal orientation of said base member ( 14 ).
4 . The anchor ( 10 ) for post tensioned concrete reinforcement as claimed in claim 1 , wherein said anchor ( 10 ) further comprises a grease cap that prevents any atmospheric effects on tapered wedges ( 32 ) and cable/tendon ( 34 ) inside said through tubular section ( 30 ).
5 . The anchor ( 10 ) for post tensioned concrete reinforcement as claimed in claim 1 , wherein a sheathing layer made up of HDPE or PE, provides protection against corrosion to the metal body of said anchor ( 10 ).
6 . The anchor ( 10 ) for post tensioned concrete reinforcement as claimed in claim 1 , wherein said anchor ( 10 ) can be arranged to provide flexibility to be deployed as an intermediate anchor.