Anchor bolt and C-shaped grooved expansion sleeve

摘要

Disclosed is an anchor assembly adapted to be anchored within a borehole defined within a concrete substrate so as to be capable of meeting cracked concrete testing standards. The anchor assembly includes an anchor bolt with an enlarged head portion and an expansion sleeve member annularly disposed around the anchor bolt member. The expansion sleeve is formed from a sheet member rolled upon itself so as to have a C-shaped cross-sectional configuration. The expansion sleeve has a number of annular grooves disposed only upon a forward external portion. A rearward external portion of the expansion sleeve member is non-grooved and solid. In use the anchor bolt member is moved axially rearwardly through the expansion sleeve member and the enlarged head portion of the anchor bolt member will progressively expand the forward portion of the expansion sleeve member so that the annular grooves will be progressively forced into engagement with internal side wall portions of a borehole defined within a concrete substrate. Subsequently, the enlarged head portion of the anchor bolt member will progressively expand the rearward portion of the expansion sleeve member so that the non-grooved solid portion of the expansion sleeve member will be progressively forced into engagement with the internal side wall portions of the borehole. A method of performing cracked concrete testing using the anchor assembly is also disclosed.