Rebar coupler

A rebar coupler that connects rebars with each other and fixes the rebars in a longitudinal direction, comprising:

• a pair of coupler bodies each having a cylindrical shape through which an inside is penetrated to have a passage, each including an inlet in one side through which one of the rebars is inserted, and each having a fixing piece contact surface inclined toward the inlet inside the penetrated passage;
• a connector disposed between the pair of coupler bodies to couple opposite ends of the inlets of the respective pair of coupler bodies with each other;
• a plurality of fixing pieces arranged radially inside each coupler body, wherein a plurality of inclined surfaces inclined toward the inlet are formed on a circumference of an outer surface at an interval so that the outer surface is installed to be in surface contact with the plurality of fixing pieces, wherein a plurality of axially-extending horizontal locking protrusions which line contact an outer circumferential surface of the rebar in a direction parallel to the longitudinal direction of the inserted rebar are formed in one side of an inner surface of each fixing piece so that the rebar coupler can prevent relative rotation of the rebar when fixed therein and a plurality of circumferentially-extending vertical locking protrusions which line contact the outer circumferential surface of the rebar in a direction transverse to the longitudinal direction of the inserted rebar are formed in another side of the inner surface of each fixing piece so that the rebar coupler can prevent axial separation of the rebar when fixed therein, while fixing the rebar inserted into the inside through the inlet;
• and
• an elastic member provided inside each coupler body to press the plurality of fixing pieces toward the inlet,
• wherein the plurality of fixing pieces arranged in each coupler body comprise at least two fixing pieces forming one group, the at least two fixing pieces form four inclined surfaces inclined toward the inlet at an interval on a circumference of the outer surface, and one end of the outer surface is formed in a rectangular shape and another end thereof is formed in a circular shape, and wherein the fixing piece contact surface inside each coupler body is formed to correspond to the outer surface of the at least two fixing pieces.