[TowerTalk] Achor bolts?

[Steve Maki]

Yep, because closely spaced bolts can more easily pull out a *chunk* of 
concrete containing all the bolts than widely spaced ones. I was 
thinking of bolts *slipping* out of the concrete.

-Steve K8LX

On 03/24/18 19:11 PM, Mike Fahmie via TowerTalk wrote:

> 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,
>> 
>>