METHOD FOR PROCESSING JOINT END OF PROFILE BAR STEEL FOR REINFORCING CONCRETE AND THE PROCESSED PROFILE BAR STEEL AND CONNECTION STRUCTURE OF THE PROFILE BAR STEEL

摘要

PURPOSE: Provided is a method for processing joint end portions of a profile bar steel in order to reinforce concrete and to improve mechanical property of the bar without breaking the reinforcing bar texture in the joint portion commonly used in construction or civil engineering fields. CONSTITUTION: The method comprises a step of swaging a rib(30) and at least one joint ends(40) of the profile bar(100) on a cylindrical body(10) of the profile bar under room temperature to have a maximum diameter of the joint end substantially same to the diameter(11) of the cylindrical body, or larger or smaller than the diameter along the processing level; and another step of roll-forming threaded portion corresponding to diameter of the swaging around outer peripheral side of at least one joint end of the profile bar obtained from the swaging process. A shaft of the profile bar after the swaging process is substantially coincident with another shaft of the profile bar formed with the rib and the knobs(20).