[TowerTalk] Achor bolts?

[Mike Fahmie]

No, the pull out strength will depend on how far apart the anchors are.  Closely spaced anchors will compromise pull out strength.  Optimum spacing will depend on anchor depth.-Mike WA6ZTY

      From: Steve Maki <lists at oakcom.org>
 To: towertalk <towertalk at contesting.com> 
 Sent: Saturday, March 24, 2018 4:07 PM
 Subject: Re: [TowerTalk] Achor bolts?
   
How many bolts? Obviously 10 bolts will have 10x the strength of one, 
including pull out strength.

Most SS towers are designed for fewer large bolts rather than many small 
bolts. Part of the reason for that is corrosion concern.

Let the flange hole size be your guide! Of course, take a quick glance 
at the manufacturer's foundation plans...

-Steve K8LX

On 03/24/18 9:34 AM, Hans Hammarquist via TowerTalk wrote:

> Dear towertalkers,
> 
> The are claims in a discussion on Face Book that an anchor bolt, "5/8 in. x 12 in. Hot-Galvanized", is suitable for a free standing tower. Someone even claims it is used for a 400' freestanding tower. It doesn't make sense to me but I might be overly pessimistic.
> 
> I hate to start lengthy discussions and this might be one of them so, please, comment only if you have a well grounded answer. I'm sure there are plenty of opinions about it like my own, but I would like to know if my guts feeling is right or wrong. What I am afraid of is that you can pull out an anchor bolt like that right out of curred concrete.
> 
> 73 de,
> 
> Hans - N2JFS

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