BUTT JOINT OF REINFORCING BARS Russian patent published in 2024 - IPC E04C5/16 

FIELD: construction.

SUBSTANCE: invention relates to butt joints of reinforcing bars and can be used in construction and installation works and in making building structures from reinforced concrete. Butt joint of reinforcing bars includes two reinforcing bars with projections of trapezoidal section on the outer surface of the bars, located along a single-turn helical line, and a sleeve of tubular section, covering the rods, on the inner surface of which a trapezoidal thread is made, in pitch and angle of the profile β corresponding to protrusions on reinforcing bars. Pitch of projections Tb of reinforcing bars and thread Tc of coupling is 0.40-0.50 of diameter of reinforcing bar, height Hb of projections is 0.05-0.06 of the diameter of the reinforcing bar, the thickness of the turns of the trapezoidal screw projection of the reinforcing bar Bb and the turns of the trapezoidal thread of the coupling Bc make 0.38-0.42 of the pitch of the projections of the reinforcing bar Tb and the pitch of the coupling thread Tc, respectively. Profile angle β of reinforcing bar projections and coupling thread is 90-120°. Thickness of the turns of the trapezoidal thread of the coupling Bc is 1.0-1.1 of the thickness of the turns of the trapezoidal screw projection of the reinforcing bar Bb. Direction of screw projections on reinforcing bars, direction of thread of coupling parts can be made different.

EFFECT: increased reliability of connection due to reduction of stresses for crushing and shearing of turns at axial load of rods.

5 cl, 4 dwg, 1 tbl