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.
73
Rick N6RK
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