METHOD OF WORKING CONNECTION END OF DEFORMED BAR FOR REINFORCING CONCRETE, DEFORMED BAR WORKED BY THE METHOD AND STRUCTURE OF CONNECTING DEFORMED BAR

摘要

With an object of providing a method of working a connection end portion ofdeformed bar for reinforcing concrete considerably reducing working expense byenhancing easiness of working by promoting mechanical strength of a connection portionby being able to work the connection portion without destructing a steel skeletonstructure of a connection portion between pieces of steel bar, deformed bar worked bythe method and a connection structure of deformed bar, the invention provides a methodof working a connection end portion of deformed bar for reinforcing concrete featured incomprising a swaging step in which in deformed bar for reinforcing concrete featured inswaging at least a connection end portion at normal temperature and forming a rolledthread portion at an outer peripheral face of the connection end portion of the deformedbar subjected to the swaging step in which at least one connection end portion is swagedat a normal temperature such that a maximum diameter of the connection end portion isequal to or slightly larger than a diameter of a cylindrical body of the deformed bar orslightly smaller than a diameter of the deformed bar depending on a degree of working;anda rolling step of forming a thread portion having a diameter substantially equal toa swaging diameter at an outer peripheral face of the connection end portion of thedeformed bar which has been subjected to the swaging step.