[TowerTalk] Tower foundation and bedrock

[Dick's]

Chuck-

I was worried about the same thing when I put up my crank up tower, but the rock was crumbly enough I was able to get down 8.5’.

(The following thought is not based on any engineering calculations, but...)

You need to make a wood template for the bolt pattern above the concrete. I would also make a steel plate (maybe 1/4” thick) with the same bolt pattern for down in the hole. Then drill into the limestone a lot of holes and hammer in bolts deep into the rock. Have those bolts come up through additional  holes in the 1/4” thick plate. Hence, the plate inside the concrete is held in place by bolts into the rock, and the plate gives you a termination for the anchor bolts going up above the concrete.

Sent from my iPhone 

Dick, K0CAT


> On Apr 7, 2019, at 7:34 PM, Charles Lind <cxl24 at case.edu> wrote:
> 
> 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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