"Eric in North TX" wrote in message
ps.com

Just an after thought, what about sinking threaded
inserts into the concrete when it is poured? You could
have bolts in them to keep the concrete out of the
threads, and remove them after it cured to solve the
tripping hazard.

Best idea I've seen yet. To embellish this use a fairly long
threaded bolt, put on several nuts with large washers between
each. Install only loose finger tight so they don't bind removing
the bolt.