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.
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.)
a) often pipe is coated with oils which may adversely effect
b) black pipe rusts quicker than galvanized
Hope this helps,
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
drill through cross holes in the pipe to accept small (1/4 or 3/8)
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
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.
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