Several years ago I replaced a US Tower 55 ft that had blown over in
exceedingly high winds.
The customer decided as long as the insurance is paying for most of it why
not go to a HDX-572MDPL, a 72 ft'r.
I contacted Hilti with the tower specs and they told me what epoxy to use
and the depth of the hole for the bolts.
After cutting off the old bolts, we had a concrete coring company come out
and using the new T-Base as a template, had him drill the 6 new holes, 18"
deep, 1 1/16th" ID
US tower supplied me with 6 new high strength threaded rod, 1" diameter by
Using the special Hilti applicator and the epoxy they recommended, filled
each hole. Then pushed each rod into the hole. Excess epoxy squirting out
cleaned up. Depending on the temperature, it takes 8-24 hours to set up
full strength. I had asked Hilti what was the pull out strength for each bolt
and he said 17,000 lbs.
2 Days later I mounted the T-Base and using the US Tower raising fixture,
raised the tower, 24 ft chromalloy mast and M2 rotor vertical. Needless to
say, the bolts didn't move.
Installed a Hygain TH-11 and a Cushcraft XM-240.
All are still up and working fine.
_Communications Service Co_ (http://members.aol.com/kj6y/skip.html)
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