Reinforced concrete structure, rebar end anchor therefor and method of manufacturing
A method of forming anchors at the ends of rebars includes providing an anchor plate, forming an opening through the anchor plate that is larger than the diameter of the rebar, heating the end of a rebar, inserting it into the anchor plate opening and then forging it to upsize the rebar end into engagement with the wall of the anchor plate opening. Preferably, the wall of the opening through the anchor plate is irregular to enhance the interlock between the upsized rebar end and the anchor plate. The resulting rebar end anchor then finds particular utility in reinforced concrete structure at joint intersections of for example, a beam and column or wall.
1 . A rebar end anchor comprising:
an anchor plate,
an opening formed through said anchor plate,
said opening having irregular wall portions,
a rebar having an anchor end and an outer surface and deformations formed in said outer surface,
said rebar anchor end being received in said anchor plate opening and forged into mechanical interlock with said irregular wall portions of said opening.
2 . The combination of claim 1 wherein said rebar is of substantially constant diameter prior to being forged into mechanical interlock with said irregular wall portions of said opening through said anchor plate.
3 . The combination of claim 2 wherein said rebar diameter is smaller than said opening through said anchor plate.
4 . The combination of claim 3 wherein said irregular wall portions comprise circular grooves.
5 . The combination of claim 4 wherein said grooves comprise threads.
6 . The combination of claim 3 wherein said irregular wall portions comprise a counterbore formed in said opening in said anchor plate.
7 . The combination of claim 3 wherein said irregular wall portion comprise alternating peaks and valleys projecting inwardly in said opening.
8 . The combination of claim 1 wherein said anchor plate is substantially round.
9 . The combination of claim 1 wherein said anchor plate is polygonal.
10 . The combination of claim 1 wherein said anchor plate is rectangular.
11 . A reinforced concrete structure comprising:
a concrete body;
a concrete beam intersecting said body,
a reinforcing bar imbedded in said body and said beam and having an end terminating in said body,
an end anchor plate,
an opening formed through said anchor plate,
said opening having irregular wall portions, and
said end of said reinforcing bar being received in said opening and forged into mechanical interlock with said irregular wall portions of said opening.
12 . The structure of claim 11 wherein said reinforcing bar is substantially constant in diameter prior to being forged into mechanical interlock with said irregular wall portions of said opening through said anchor plate.
13 . The structure of claim 12 wherein said reinforcing bar diameter is smaller than said opening through said anchor plate.
14 . The structure of claim 13 wherein said irregular wall portions comprise circular grooves.
15 . The structure of claim 14 wherein said grooves comprise threads.
16 . The structure of claim 13 wherein said irregular wall portions comprise a counterbore formed in said opening through said anchor plate.
17 . The structure of claim 13 wherein said irregular wall portions comprise alternating peaks and valleys projecting into said opening in said anchor plate.
18 . The structure of claim 11 wherein said anchor plate is substantially round.
19 . The structure of claim 11 wherein said anchor plate is polygonal.
20 . The structure of claim 19 wherein said anchor plate is substantially rectangular.
21 . A method of manufacturing a rebar with end anchor comprising:
providing an anchor plate,
forming an opening through said anchor plate having irregular wall portions,
providing a length of rebar having an anchor end,
heating said anchor end of said rebar,
inserting said heated anchor end of said rebar into said opening in said anchor plate, and
forging said heated anchor end of said rebar into mechanical interlock with said irregular wall portions of said opening in said anchor plate.
22 . The method of claim 21 wherein said rebar is of substantially constant diameter prior to being forged into mechanical interlock with said irregular wall portions of said anchor plate.
23 . The method of claim 22 wherein said substantially constantly diameter of said rebar is smaller than said opening through said anchor plate.
24 . The method of claim 23 wherein said irregular wall portions comprise circular grooves.
25 . The method of claim 24 wherein said circular grooves comprise threads.
26 . The method of claim 23 wherein said irregular wall portions comprise a counterbore formed in said opening through said anchor plate.
27 . The method of claim 23 wherein said irregular wall portions comprise alternating peaks and valleys projecting into said opening in said anchor plate.
28 . The method of claim 21 wherein said anchor plate is substantially round.
29 . The method of claim 21 wherein said anchor plate is substantially polygonal.
30 . The method of claim 29 wherein said anchor plate is substantially rectangular.