In a message dated 2/13/2006 3:17:48 A.M. Pacific Standard Time,
towertalk-request@contesting.com writes:
> Hi TTians,
> In a few months I will be starting construction on a new house which will
be
located on top of a hill on a adjacent piece of property. My HDX589 is
currently installed on the manufacturer's recommended base of 5x5x8.5 feet
of concrete with rebar.
> Test holes in the vicinity of the new house have revealed between 16 and
40
inches of soil on top of the rock the hill is made of. A blasting contractor
has told me that the stone is very strong and stable and he will not have
any problems blasting for the house basement and foundation.
> I won't be able to dig another hole and use the same method as the current
location. Instead, I have been told there are bolts or rods that can be set
into holes drilled into the stone and epoxied in place which can support the
tower.
> I will probably need an engineer but don't know where to begin to find
one
familiar with this type of work or what alternatives exist. Anyone familiar
with this technique or alternative method who can steer me in the right
direction? Any particulars I need to provide to him/her that I need to
research in advance?
Well, getting an engineer's blessing is always a good idea. Maybe you
can talk to a couple and get some off-the-record feedback on what you've got
and what's possible.
I would be in favor of using the rock as the base and then you only have
to use a little concrete to get the top of the base a little above grade.
Why would you dynamite out a bunch of rock and then fill in the hole with
concrete when the rock by itself would accomplish the same thing?
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.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for amateurs
Cell: 206-890-4188
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