[TowerTalk] UST HDX589 crank-up tower base on rock?

K7LXC@aol.com K7LXC at aol.com
Thu Feb 16 12:08:22 EST 2006

In a message dated 2/16/2006 8:53:27 A.M. Pacific Standard Time,  
towertalk-request at contesting.com writes:

>>   Steve wrote:
>>    You can rent a rock corer to drill  the  appropriate holes for the 
>>  factory anchor bolts -  or have someone come out and  do it - and then 
>>  you can  epoxy them in or use rock expansion bolts - or  both. It'll be  
>>  real strong.

>  "Or both"... interesting  idea - has anybody here used it?

>  It's impossible to dig  post-holes here. We tried a little harder with a 
backhoe, but at all five  locations it hit solid rock only a few inches 
down. The best it could  manage was five shallow scrapes, so I'll now 
have to level each of these  back up to grade with concrete, and then use 
bolt-down sockets for the  wooden posts. My plan had been to drill 
half-inch holes right through the  concrete and some way down into the 
solid rock, and then use half-inch  threaded rods anchored by epoxy (or 
similar... whichever kind of resin  works best in damp rock).

>  Does that make sense, to the folks  who have used epoxy?

        Yep, that's what you do.  Either rock expansion bolts or epoxied 
anchor rods will work. Epoxying in the  expansion bolts is just a 
belt-and-suspenders (braces for you POMEs - hi)  approach. 
    Check this out for more info:  
_http://www.fastenersplusinc.com/anchors/anchors.html_ (http://www.fastenersplusinc.com/anchors/anchors.html)  It  looks 
like the HEX HEAD WEDGE version is the most suitable one  for tower anchors. 
Steve    K7LXC

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