Is it safe to use a wedge expansion bolt in concrete blocks?
I also didnt find any of the expansion bolt manufactures that could recommend using an expansion bolt in anything but solid concrete stating specifically &quot;Not for use in cement block&quot;. They do give rating specifics for such things as 'Maximum Force&quot; before pullout: 2000 lbs for a 1/2&quot; x 4 1/2&quot; zinc plated bolt. I scanned some of the questions and answers on Amazon. Some stated they had attached it to block with stable results. I'd favor the recommendations of the bolt company to not rely on it securing your pull-up bar. If you decide to use the bolts locate them in the mortar joints.
If you attach (2) 2x6 vertically (one for each side) from the floor to
higher then the top bracket hole using expansion bolts spaced at 16 inches on center; it should be strong enough to than bolt you brackets  to the 2x6 (unless you kipp!).
Other ideas involve drilling 5/8&quot; anchor holes for 1/2&quot; all-thread glued with epoxy glue. Using anchor epoxy would hold.