[TowerTalk] Tower foundation and bedrock

[Herschel Hall]

Be sure when using the wood template to have correct side up, had a
concrete contractor flip mine over & the back bolt did not line up. Gave
them the UST drawing & they still tried to blame on me,
Herschel
WA9KIA

On Tue, Apr 9, 2019 at 8:46 AM Dick's <rcblumen at centurylink.net> wrote:

> 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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