A wt51 is probably too heavy to allow on top of a truck cab,
Similarly, in a layover situation, that 400 lbs (if that's the
correct weight)... will be
amplified by a 10' lever, and you'll apply 4000 ft-lbs of
overturning moment to the
back of the truck. I see disaster written all over that plan.
I snipped out parts of Floyd's comments:
Floyd, kc5qbc, wrote:
What you would be better off doing is taking a look for the falling
derrick procedure which has been metioned here in the archives to
lower the tower.
I would generally recommend only using the truck as an anchor point
and doing the lowering work with a come-a-long from as high up the
tower as practical assuming it has a tilt base.
I would caution against using a manlift as a crane because it was not
designed for that purpose.
Not knowing your skillset in contruction engineering, if it feels
questionable at all, simply let a professional handle the takedown,
the risks are
just not worth it.
To which I will append: There are no free towers.
Taking down old iron is dangerous.
Renting a proper truck for transport is cheap.
Renting a crane, while pricey, may be the only safe way to handle
high iron, in a confined space.
And finally, the falling derrick is a worthwhile technique for
layover, as Floyd suggested.
Even 10' of 25g and a come-along would mitigate the risks, if you
have a clear layover path.
Jim Jarvis, President
The Morse Group, LLC
Achieving Results in a Changing World
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