Attachment anchor assembly

An attachment anchor assembly for securing a component (5, 15) to a base material (U), said attachment anchor assembly comprises an axially extending anchor rod (1, 11) having a leading end and a trailing end with an axially extending anchoring region (2, 12) extending from the leading end and insertable into a borehole filled with a hardenable mass (4, 14) in the base material (U) and an axially extending trailing end region arranged to extend out of the borehole in the base material (U) with the component having a through opening (5a, 15a) through which the trailing end region can extend, a force engagement means (7, 17) located on said trailing end region, a centering sleeve (8, 18) laterally enclosing said trailing-end region between said force engagement means (7, 17) and said anchoring region (2, 12), wherein the improvement comprises an annular sealing element (9, 19) laterally enclosing said anchor rod (1, 11) in a sealing manner and located between said centering sleeve (8, 18) and said anchoring region (2, 12), said sealing element comprises an annular sealing surface (9a, 19a) extending transversely of the axial direction and facing toward said anchoring region, and said sealing surface is axially displaceable towards said centering sleeve (8, 18), said sealing element (9, 19) comprises a sealing ring spaced axially from said centering sleeve (8, 18) by rated breaking webs (21).