Frank, Your guy anchor?/flagpole will break right above or below the
coupler/reducer because when the pipe is threaded it removes a lot of
material. We made a flag pole where I use to work by welding tubing
together, stepped sizes over lapped. We raised it by drilling 2 holes
through the bottom about a foot apart and setting 2 pieces of channel
iron back to back in concrete. View from above, }O{. To raise it we tied
a rope to the top (there was a stop on the pipe so it could not go past
vertical) . 4 or 5 people lifted it and started walking it up while 4 or
5 pulled on the rope, not easy as the pole was 45 feet long. It's still
there. Bottom line: Your idea about coupler/reducers won't cut the
mustard.
73, Bill KB3AUG
Riverton, WV
On Thu, 15 Jan 1998 15:45:52 -0800 (PST) ftbrady@earthlink.net (Frank T.
Brady) writes:
>I'm putting some schedule 40 pipe together with coupler/reducer
>fittings to
>form a sturdy guy anchor/flagpole. The bottom is a 10 foot section of
>3"
>pipe, coupled to a 10 foot section of 2 1/2" pipe, coupled to a 10
>foot
>section of 2" pipe. About 4 feet of the bottom section will be
>imbedded in
>concrete (with a threaded coupling or bolts at the bottom to 'grip'
>the
>concrete).
>
>Although the pipe supply place seemed to agree that this would be a
>sturdy
>structure, I thought I'd ask the list members if you agree (this is a
>50 to
>70 mph 'zone' and a 3'x5' flag will fly from the top).
>
>Also, after seeing how strong this pipe is and the coupling fittings
>that
>are available, I realized that one could construct a fairly high steel
>mast
>out of this stuff.
>
>Is it very difficult to calculate the self-supporting limits and guyed
>limits of such a mast?
>
>I realize that I would have to have a crane drop the 'mast' into the
>hole,
>but a self supporting steel mast would sure be better than the 7 tiers
>of 3
>guys necessary for the H70 I've got on order (IF I can assure that a
>pipe
>mast is safe).
>
>The load is whatever is created by pulling the slack out of a wire
>antenna
>strung between the top of the two masts (something like 100 pounds
>max?).
>
>Also, the top load will be equalized by two back-stay guys opposed to
>the
>antenna pull.
>
>Thanks,
> Frank T. Brady - W0ECS
> Wildomar CA
>
>
>
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