[TowerTalk] Fwd: Tower foundation and bedrock

[Hans Hammarquist]

 Hi Chuck,
Bedrock is, I believe, the best to anchor a tower in. Just make 100% sure it is bedrock you have where you are erecting the tower. When I was planning for my tower a (big mouth) "friend" of mine told me where to find bedrock. He pointed out a spot that was 100% bedrock. He even "tested" it by kicking on it with his boot. Well, the "bedrock" turned out to be a relatively large rock, ~100 lb but there was no "bed-" with it. I'm just happy I checked before I spent the time to attach anything to the rock. I, instead, dug down 5 feet, placed a 6'x6' granite block (that just happened to lay around on my property), and attach my tower to that. As I also had a ton of scrap metal laying around, I placed that on top of the granite to add some extra weight.
I used 6 galvanized angle irons attached to the granite block with 12 bolts-and-nuts. The bolts all go through the block. The angle irons are encased in concrete. I felt I didn't have to add any yards of concrete for this installation. It has been a few years now and nothing has moved.
73 de,
Hans - N2JFS
 
 
-----Original Message-----
From: Charles Lind <cxl24 at case.edu>
To: TowerTalk <TowerTalk at contesting.com>
Sent: Sun, Apr 7, 2019 7:41 pm
Subject: [TowerTalk] Tower foundation and bedrock

I have the opportunity to put up a TX-455 tower on the property of my
brother-in-law:  200+ acres and no zoning issues.  He says, however, that
there is limestone bedrock about only three feet down.  Before I start
Digging pilot holes, is there any advice a how to proceed with providing a
solid foundation if this is the case.

Tnx, Chuck, N8CL
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