What I did to put pvc together was was drill 1/2in + hole in one side to get a 3/4"drywall screw or self taping screw screwed out the other side into the side of another pvc pipe to make an x or tee .
3/8 Rebar spike anchors are cheaper then Tee post or cider block. Another thing I did was make semi circle shelves (6-8 ft x 3-4ft)on the inside of damn slope for spawning beds topped with sand & gravel.