In a message dated 2/16/2006 8:53:27 A.M. Pacific Standard Time,
towertalk-request@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.
Cheers,
Steve K7LXC
TOWER TECH
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