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Re: [TowerTalk] Tower ACCIDENT, engineering

To: "'jeremy-ca'" <>, <>
Subject: Re: [TowerTalk] Tower ACCIDENT, engineering
From: "Daron J. Wilson" <>
Date: Wed, 27 Jun 2007 08:21:56 -0700
List-post: <>
> If you read my comments again you will find that I said to use that same
> base plate. Sorry, but I didnt think it was necessary to have to repeat
> myself about the pin.

OK, I read them again, and I got this:

"The base should be a standard base plate but with one hole at each corner
and secured to the concrete with 3/4" J bolts."

Is there more than one standard base available from Rohn/Radian, perhaps one
with holes already drilled in each corner?  Is there an engineered
foundation drawing indicating "J" bolts in the pour?  Or, are you advocating
drilling holes in the pre-engineered products for an engineered design?  

My point was, and still is, it isn't wise advising people to drill holes in
stuff that has been engineered as part of a system.  Of course this tower is
hot dip galvanized, and drilling anywhere will violate that.  Sure you can
cold galvanize it, but that is no substitute for the real thing.

If you drill a hole in the leg of a tower, you have decreased the strength
and made a weak spot.  Couple that with the lack of galvanizing protection
where you drilled the hole, and you are creating a failure point.

"If house bracketed then a minimum of 2 brackets is required."

I'm unable to locate any of Rohn's engineering drawings that support this
either, perhaps you have something you can share to support it.



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