I need to build a set of portable volleyball net poles. I plan on using tires filled with concrete with 1 1/2" water pipe for the poles. Does concrete stick better to black pipe or galvanized? The pipe will just be embedded in the concrete; I'm not planning to weld any pieces of rebar to it.
Thanks, regards, Bob
i dont think youd have to paint the galvanized for quite a while , other than that i dont see much difference. ohh.... welding on it would be cleaner on the blackpipe. lucas
Greetings,
Go with black pipe + a screw on floor flange to embed in the concrete for less than the cost of galvanized. If you want to get fancy you can probably even rig it so that you could unscrew the poles from the tires (bolt the floor flange to a cement filled tire instead of simply embedding it -- or embed it with bolts during the pour and grease the pole for easy removal.)
Special notes: a) often pipe is coated with oils which may adversely effect steel-cement bonding b) black pipe rusts quicker than galvanized
Hope this helps, William
They "stick" about the same, but the black pipe will rust. Use the galv.
That's what I thought. But I may put a black coupling on the bottom (will be encased in the concrete) and weld some steel scraps to it.
Bob
I've built several similar devices (but for tetherball)
One has been in service since 1987
Use galv pipe
Embed a pipe stub inot the concrete and use a coupling to attach the pole
drill through cross holes in the pipe to accept small (1/4 or 3/8) rebar
The bond between black pipe or galv to concrete is minimal, it's the bumps that do the job.
The black pipe is more trouble than it's worth; rust / painting cheers Bob
What I would do is use a flange embedded in the cement. Screw a short nipple on it to just above the cement, and put a coupling on top after the cement dries. That way you can take it apart. I personally would use galvanized. It might cost a few bucks more, but consider having to paint the black pipe every couple years. Paint is not cheap. I'd clean the oils off the flange and nipple with a household degreaser such as Simple Green or one of those Orange cleaners. This way you wont have to fiddle around with a long pipe and try to get it straight. Just sit the tire on a board, sit the flange on the board, center it, and pour the cement.
Mark
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