I've got to install a pole mount for a solar array. The manufacturer says to use 5" schedule 40 steel pipe (5 9/16" OD). The hole is specified as:
54" deep 30" diameter .81 cubic feet of concrete
Do I need to weld any kind of rebar to the bottom of the pipe?? What kinds of coating would be best before pouring concrete? Of course, I'll be sloping the top of the concrete for water drainage.
I'm assuming that I need the concrete poured under the pipe opening .... so what do I use as a standoff to raise the pipe off the bottom of the hole? Should I cap the end of the pipe encased in concrete?
I was planning on building a 2x4 wood collar above ground, along with diagonal 2x4's for ground support to maintain vertical until the concrete cures.
Any thoughts or recommendations? Thanks!