Date: Tue, 5 Apr 2022 02:27:46 -0500
From: <maflukey@gmail.com>
To: <TowerTalk@contesting.com>
Subject: [TowerTalk] FW: Rohn anchor bolts, grade?
<Thanks for the clarification Jim - you are correct. Those 105's you have
must be <pretty stout ?
<73
<Matt
<KM5VI
## I have the older, 5000 lb version of the HDX-689. Mine uses a
combination of Z and X braces. New version of the HDX-689 is 3250 lbs,
and uses just a continuous W bracing on each section. Old version used
12 x 1.125" anchor rods. New version uses 12 x 1.25" anchor rods.
## I'm stuck with the 1.125" sizing, so went to plan B, and made em
longer, and also used the 105 ksi version. I also re-designed the entire
re-bar cage, and used 24 x 1" vertical rebars...instead of the oem 16 x
rebars. I used 1 in each corner, then 5 equally spaced on all 4 x sides.
Then used 15 mm rebar for the horizontals. My eng approved the
modifications. Stirrups used in one corner of each horz bracing assy. He
also insisted that I install a grid of rebars just below the top of the
foundation..and also just below the anchor rods. I figured it's a one shot
deal, so may as well go off the deep end, and beef it up.
Jim VE7RF
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