[TowerTalk] New Tower Old Base

[KJ6Y at aol.com]

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