Abstract: A method for hot forging at least one end of a steel reinforcing bar (i.e., a rebar) to simultaneously form a wide head and threads funning around the head during a single step whereby to enable the bar to be coupled end-to-end an adjacent steel bar to be used, for example, to reinforce a precast concrete structure. The end of the bar is first preheated, and the heated end is surrounded by a closing die having a threaded geometry. The die is then nested within and closed around the heated end by an annulus ring of a hydraulic press, or the like. A hydraulic ram of the press is moved through the annulus ring and into engagement with the heated end of the rod so as to apply a compressive force thereto. The metal of the heated end flows into the die so as to be enlarged therein and assume the threaded geometry of the die.

Abstract: An anchorage device and a method for connecting the device to an upstanding end of a rebar after the opposite end has been embedded in concrete. The anchorage device forms a head around the upstanding end of the rebar that will be covered with concrete to create bearing surfaces to hold the rebar in place within the concrete. The anchorage device includes a barrel having a tapered bore within which to receive the upstanding end of the rebar. A lid extends across the top of the barrel, and a threaded bolt is rotated through a threaded hole in the lid and into contact with the upstanding end of the rebar to apply an axial pushing force thereto. A segmented jaw slides through the tapered bore of the barrel into surrounding locking engagement with the upstanding end of the rebar to connect the device thereto.

Abstract: A method tor hoi forging at least one end of a steel reinforcing bar (i.e., a rebar) to simultaneously form a wide head and threads funning around the head during a single step whereby to enable the bar to be coupled end-to-end an adjacent steel bar to be used, for example, to reinforce a precast concrete structure. The end of the bar is first preheated, and the heated end is surrounded by a closing die having a threaded geometry. The die is then nested within and closed around the heated end by an annulus ring of a hydraulic press, or the like. A hydraulic ram of the press is moved through the annulus ring and into engagement with the heated end of the rod so as to apply a compressive force thereto. The metal of the heated end flows into the die so as to be enlarged therein and assume the threaded geometry of the die.