The present invention is concerned with a rigid assembly joint for connecting at least one longitudinal tubular element of a framework structure to at least one traverse tubular element of the said structure.More particularly the present invention deals with a rigid assembly joint of two tubular longitudinal elements and at least one traverse tubular element of a framework structure which consists substantially of metallic tubes of generally circular cross section, an assembly joint in which the two longitudinal tubular elements are joined in an abutting relationship, while the traverse tubular element forms an angle with at least one of the longitudinal tubular elements.