weld a ring to the top of the rebar.
Like this? http://www.amazon.com/gp/aw/d/B00DZ2BZA4/ref=mp_s_a_1_1?qid=1438306371&sr=8-1&pi=AC_SX200_QL40&keywords=rebar&dpPl=1&dpID=51sviGXBDTL&ref=plSrch