This tubular joint includes a bell end (4) which is equipped with an internal groove (18) and in which is inserted a spigot end (6), a seal (8) and a locking element (12). The groove forms a groove wall (20). The spigot end (6) and the bell end (4) define a radial clearance (J). The locking element (12) includes a fixing tooth (36) and a contact face (28) for application against the wall (20) when the clearance (J) is within a first range of clearances. When the clearance is within a second range of clearances, the locking element (12) forms a rocking point (34) for rocking round the groove wall (20) and the fixing tooth (36) bites into the external surface (22) by a flying buttress effect of the locking element (12).