Locking joint for pipe systems

A locking joint for joining a smooth end (1) of a first tubular element and a socket (2) of a second tubular element, said joint comprising:

• an annular sealing gasket (8) housed in the socket, an annular locking ring (15) incorporating interior teeth (18) surrounding the smooth end, an annular counter-flange (11) fitted with means (12) for attachment to the socket and configured to implement position-retention of the locking ring opposing any backward movement thereof in a direction away from the smooth end of the first tubular element, a rigid annular stop ring (9) which encloses the smooth end and abuts the gasket, and an annular collar (16) made of elastomer and duplicate molded on the locking ring, enclosing the locking ring on all sides except on an interior toothed face thereof, said collar being disposed within the counter-flange, between the counter-flange and the smooth end, and comprising, on a front end facing the socket, at least one annular elastic lip (19) disposed longitudinally between the locking ring and a rear face (14) of the rigid annular stop ring.