Post-tensioning apparatus and system for structures

Abstract

The present invention pertains in general to post-tensioning apparatus and systems surrounding the fabrication and repair of concrete and other construction materials. The present invention surrounds apparatus and system directed to the post-tensioning for reinforcement of existing and new concrete structures through the application of tensile forces between two attachment points anchored to the structure to be mended.

What is claimed: 
     
         1 . An apparatus for applying tension to cracked concrete surfaces comprising:
 a tensioning mechanism comprising a constant cross-sectional profile, a first female threaded feature at a first distal end of said tensioning mechanism, a second female threaded feature at a second distal end of said tensioning mechanism, and a torque application feature located medially between said first and second female threaded features;   a first tension application component, with a proximal end aligned with and proximate to said first distal end of said tensioning mechanism, said first tension application component having a male threaded feature at said proximal end of said first tension application component, said first tension application component having at least one structure engaging feature located at a distal end of said first tension application component;   a second tension application component, with a proximal end aligned with and proximate to said second distal end of said tensioning mechanism, said second tension application component having a male threaded feature at said proximal end of said second tension application component; said second tension application component having at least one structure engaging feature located at a distal end of said second tension application component;   said male threaded features of said first tension application component and said second tension application component configured to engage with said female threaded features of said tensioning mechanism wherein the rotation of the tensioning mechanism in a first direction causes said first tension application component and said second tension application components to retract toward a center of said tensioning mechanism and rotation in a second direction causes the first and second components to protract from the center of the tensioning mechanism;   wherein actuation of said tensioning mechanism by rotation allows post-tensioning of a structure when said first tension application component and said second tension application component are engaged with said structure.   
     
     
         2 . The apparatus of  claim 1 , wherein said structure engaging feature of said first tension application component and said second tension application component are selected from the group consisting of: post-form, plate-form, loop, hook-form fixation point or aperture. 
     
     
         3 . The apparatus of  claim 1 , wherein the threading of said male threaded features and said female threaded features are of ANSI thread designation 3/8-16. 
     
     
         4 . The apparatus of  claim 1  wherein said apparatus comprises a material composition comprising a steel alloy designated as a hot rolled and proof stressed alloy steel conforming to ASTM A722 CAN/CSA (G279-M1982). 
     
     
         5 . The apparatus of  claim 1  wherein said apparatus comprises a material composition comprising a steel allow designated as AISI 1144 compliant. 
     
     
         6 . The apparatus of  claim 1  wherein said torque application feature comprises a torque application aperture.