http://www.simpsonanchors.com/ has lots of info..figure out what you need,
and go buy it.
Just for an example, for one of the products, from the charts there, it
looks like 1/2" allthread (A 307 grade C), embedded 4 1/4 or 6 inches is
limited by the allthread strength (3750 lbs). Going to A193, Grade B7
all-thread makes the bond the limit at around 4500lbs (the allowable
capacity of the bolt is 8080 lbs)
Going to bigger bolts and holes ups the strength a LOT. 1" bolts have
allowable loads like 15,000 lbs.
I'm no pro at this stuff, but it seems to me there's an important caveat --
if you're going to climb the tower as it goes up, use temporary guys before
you set the permanent ones, because the stresses imposed on those bolts by
a large human on the end of 20-30 feet of Rohn 25, unguyed, could cause
something to bend or break, and it may not be the bolt itself. This is no
more onerous than using a pier pin mount, which might be another way to go.
73, Pete N4ZR
The World HF Contest Station Database was updated October 29.
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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