In a message dated 6/25/2002 11:50:30 PM Central Daylight Time,
> The weak link is not the steel member but the soil's ability to
> withstand the load you are hoping it will resist.
Good point, however, there many soil types and installations that will handle
a huge load. I have a very loaded up 110' Rohn 55 Tower (prox 25 sq ft.
antennas) supported by 3 elevated guy posts which are 8" double wall pipe.
All are 5' in the ground with two being 8' out and one being 4' out. The
difference with mine from what I've heard is that the concrete base, 3' x 3'
x 4' deep is actually 5' down. There is one foot of dirt over all so that
they can be cut off when I move on. I stuffed about 3' of wire mesh down
from the top and core filled to that point to keep out water. The 13' pipe
pieces weighed about 450#, so it was quite a trick getting them in the middle
of the holes. Welded on 1/2" steel plate ( 2"- 8") for guy connections
The plus with round pipe is that it looks a heck of lot better than "I" beam
when all painted up. Also there is little to gain by tilting it except that
it looks terrible! I had a PE pal do some quick checks in my somewhat
rocky/clay soil, and he said I was fine. It has been up for several years
and hit by several big storms. Several damaged antennas, but All 3 pipes
are PERFECTLY straight.
The key, of course, is soil type and depth--but no need for overkill.
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