The first time I needed to do this, I contacted Hilti Products and talked
to their engineers. Sent them a copy of the engineering calcs from US
Tower and they came back with the necessary product needed.
It was for a HDX-572MDPL tower. Took 6 1 1'8" high strength threaded rod
embedded 22" into the concrete. Used the epoxy and the application gun. I
asked what was the pull out strength of each and was told a minimum 17,000
lbs on each anchor. Proceeded to installed the tower in the usual way of
tilting up with the raising fixture. Carefully watching the anchor bolts as I
lifted the tower, nothing happened and the installation went just like any
other normal installation. I have since done this on other installations
with no problems.
I used a concrete coring company to do the larger holes. Doesn't cost a
lot and they can go deeper than any drill bits I have. Of course, the
existing foundation should meet the new tower specifications.
Skip, KJ6Y
_Communications Service Co_ (http://www.communicationsserviceco.com/)
818-887-3569
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