[TowerTalk] Adjustments to Tower Base Pier J-Bolts
Richard (Rick) Karlquist
richard at karlquist.com
Mon Jul 24 11:47:01 EDT 2017
On 7/24/2017 7:20 AM, Jim Thomson wrote:
> ## Those J bolts he is using, are massive... at 1.875 inchs across, with
> 12 inches sticking above the concrete. Paul did not say how many are used on
> each corner, probably at least 4. They are not gonna budge, whether a sledge hammer, or
> hydruaulic jack used...or trying to crank up on the lower nuts, trying to raise the template...
> and then trying to bend the J bolts, not gonna happen.
Please explain why the J bolt fabricator can bend the end of the
J bolts into the shape of a "J", but OTOH, the installer cannot put
a very slight bend into them. With 12 inches above the concrete,
there is something like 12:1 leverage. Even with 100,000 PSI J
bolts, a 20 ton jack should be able to easily exceed the yield
strength. I know my jack simultaneously bent 4 one inch braces
without any trouble. I also had about 12 inches of leverage.
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