Strand-to-threadbar coupler block for prestressed concrete

A system comprising:

• a first concrete member;
• a second concrete member;
• one or more multi-wire strands disposed within the first concrete member;
• a strand-to-threadbar coupler block disposed within the first concrete member, the strand-to-threadbar coupler block formed with a threadbar opening to admit a threadbar, and with one or more strand openings;
• one or more strand chucks coupled to the strand-to-threadbar coupler block at the one or more strand openings, wherein a chuck diameter for the one or more strand chucks is greater than a diameter for the one or more strand openings, and wherein the one or more multi-wire strands extend through the one or more strand openings and engage the one or more strand chucks;
• a threadbar anchorage affixed to the second concrete member, wherein the threadbar extends from the threadbar opening in a direction opposite to the one or more multi-wire strands to the threadbar anchorage and wherein the threadbar couples the first concrete member to the second concrete member;
• and
• a threadbar nut coupling the threadbar to the strand-to-threadbar coupler block such that tensioning the threadbar displaces the strand-to-threadbar coupler block and increases tension on the one or more multi-wire strands.

A system comprising:

• a first concrete member;
• a second concrete member;
• one or more multi-wire strands disposed within the first concrete member;
• a strand-to-threadbar coupler block disposed within the first concrete member, the strand-to-threadbar coupler block formed with a threadbar opening to admit a threadbar, and with one or more strand openings;
• one or more strand chucks coupled to the strand-to-threadbar coupler block at the one or more strand openings, wherein a chuck diameter for the one or more strand chucks is greater than a diameter for the one or more strand openings, and wherein the one or more multi-wire strands extend through the one or more strand openings and engage the one or more strand chucks;
• a threadbar anchorage affixed to the second concrete member, wherein the threadbar extends from the threadbar opening in a direction opposite to the one or more multi-wire strands to the threadbar anchorage and wherein the threadbar couples the first concrete member to the second concrete member;
• a threadbar nut coupling the threadbar to the strand-to-threadbar coupler block such that tensioning the threadbar displaces the strand-to-threadbar coupler block and increases tension on the one or more multi-wire strands, wherein the threadbar nut is affixed to the strand-to-threadbar coupler block and wherein the threadbar anchorage includes a second threadbar nut for tensioning the threadbar;
• a void in the concrete member positioned to permit access to the threadbar nut for tensioning the threadbar;
• and
• a strand covering that covers at least a portion of the one or more multi-wire strands, proximate to the strand-to-threadbar coupler block, such that the portion of the one or more multi-wire strands proximate to the strand-to-threadbar coupler block is unbonded to the first concrete member.