Abstract: A reinforcing bar coupler according to the present invention comprises a first coupler and a second coupler, which are integrally coupled by friction welding while the end portions of a pair of reinforcing bars are accommodated therein, and which are confined in contact with each other by means of screw coupling so that the pair of reinforcing bars are connected on a straight line, wherein each of the first coupler and the second coupler has, on one side thereof, an accommodation space that is recessed so as to accommodate one end portion of the reinforcing bar, and a catching groove, which has the largest inner diameter inside the accommodation space so as to accommodate molten metal formed by dissolving a part of the first coupler, the second coupler and the reinforcing bars, and which catches and restrains the solidified molten metal so as to prevent same from flowing out in the longitudinal direction of the reinforcing bar.

Abstract: The present invention relates to a reinforcing bar coupler, for a spiral reinforcing bar, for coupling a pair of spiral reinforcing bars in a straight line, which includes, at one side of the inner part thereof, a protrusion accommodating groove screw-coupled to a spiral protrusion of the spiral reinforcing bar, and a loading part formed to have an inner diameter larger than an outer diameter of the spiral reinforcing bar, such that the end part of the spiral reinforcing bar is accommodated therein without rotation.

Abstract: The present invention relates to a reinforcing bar coupler, for a spiral reinforcing bar, for coupling a pair of spiral reinforcing bars in a straight line, which includes, at one side of the inner part thereof, a protrusion accommodating groove screw-coupled to a spiral protrusion of the spiral reinforcing bar, and a loading part formed to have an inner diameter larger than an outer diameter of the spiral reinforcing bar, such that the end part of the spiral reinforcing bar is accommodated therein without rotation.