large diameter tapcons or ldt's are the fastest, strongest fasteners i've found for anchoring to concrete. in this video i show steps for using them to ,
tighten down nuts to concrete anchor with a wrench. with the nuts hand tightened onto the anchors, you can now tighten them down with a wrench to secure the flange to the concrete base. trim bolt ends. if there's excess material from the concrete anchor sticking out, trim it off using a hack saw. insert pipe and tighten down. slide the pipe into the flange.
screw the nut flush onto the end of the concrete anchor bolt, then drill the hole to the depth of the bolt stem plus the thickness of the base plate and an additional 1/8 inch of clearance. 3 blast out the hole with compressed air and remove as much dust and debris as possible, then use a circular wire brush to provide additional cleaning and blow it out again.
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