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Re: [TowerTalk] Anchor bolts for LM470

To: <>, <>
Subject: Re: [TowerTalk] Anchor bolts for LM470
From: "KR7X" <>
Date: Sun, 15 Apr 2012 11:26:28 -0700
List-post: <">>


Yes you are correct wrt the double nut. I also callout for the threads to be
spoiled below the bottom of the lower nut. Belt and suspender philosophy.
Foundations are relatively less expensive than the equipment they help to
support until you have to fix them after the fact.





Lonberg Design Group, Ltd.

H. S. Lonberg, P.E.,S.E. / KR7X




From: [] 
Sent: Sunday, April 15, 2012 10:50 AM
Subject: Re: [TowerTalk] Anchor bolts for LM470 


>  There is no need and it is not recommended by American Concrete
(ACI) 318 design specifications for reinforced concrete to use hooked (J)
anchor rods in tension situations without reducing the tension capacity
significantly for hooked anchors on account of the crushing of the concrete
at the bend radius.


    Interesting. I didn't know that. That's probably why they don't come
like that anymore. 


    You should do what UST does and put 2 big nuts on the concrete end and
voila! - a factory-esque anchor bolt. I don't think you have to weld them in
place - just tighten them up. They ain't going anywhere. 



Steve    K7LXC



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