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[TowerTalk] Towers on Rock Ledge

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Subject: [TowerTalk] Towers on Rock Ledge
From: (Martin Ewing AA6E)
Date: Mon Aug 18 14:02:30 2003
Thanks, Steve,

I was wondering about guy anchors, too.  Do you put in a bolt oriented toward 
the guy run, or at 90 degrees, or ??

And then it's not clear what kind of grounding is appropriate, short of laying 
big grid.

Martin, AA6E wrote:
> In a message dated 8/18/03 9:59:22 AM Pacific Daylight Time, 
> writes:
>>Is there any general information available on siting towers on rock?  I 
> have 
>> granite ledge just a foot or less down, so digging the big hole in the 
>>ground won't do the trick here.
>     It's pretty simple. What you can do is to use the rock as the base. 
> Excavate down to the granite and then drill anchor bolt holes in the rock. 
> You can 
> either use expandable rock bolts or epoxy the anchor bolts right into the 
> rock. Pour some concrete on top so it comes to several inches above grade and 
> you'll be done. 
> Cheers,
> Steve     K7LXC
> Professional tower services for commercial and amateur 

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