Hi Rick,
The driver bit is a 1 1/8 hex bit Bosch #HS2172. Any of the Bosh or similar
hammers that use the 1 1/8" Hex bits will work. This is used in an impact
hammer, not a rotary hammer. The Bosch BH 2770 VCD is the hammer we used and
is available at most tool rental yards for about $20 for 4 hours. The tool
is heavy about 60 lbs and it is a two man task. The anchors are the 8"
arrowhead type. They come with a 48'' galv steel cable attached. The part
number is SKU: 8MI-12CA48kit4W/ODR for the four anchor package. However they
are available in single units with different length cables if desired. Call
MILSPEC they are very easy to deal with and they can answer any questions as
to the type of soil you have.
Palmer W7NMD
-----Original Message-----
From: Richard (Rick) Karlquist [mailto:richard@karlquist.com]
Sent: Sunday, August 31, 2014 9:30 PM
To: Palmer C Byrne; 'Linux Mercedes'
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] Guy anchors in shallow soil
On 8/31/2014 9:34 AM, Palmer C Byrne wrote:
> I have a 50' Roan 25G tilt over tower that I installed using 8"
> MILSPEC Anchors. http://milspecanchors.com . Pull out resistance is
> 9,000 pounds in hard pan soil. They will drive through or around
> granite and sandstone rocks which are common in northern Arkansas. Using
an electric jack hammer took
> less than 2 minutes to drive each anchor. You can use the same tool to
> drive your ground rods while you are at it.
> Palmer W7NMD
>
Thanks for posting that website. Lots of stuff to choose from.
Could you point us to the actual "8" MILSPEC" part you used?
You mention using a jack hammer to drive it. Are you referring to the arrow
head type? AKA "duck bill". As opposed to screw in; I don't know how you
use a jackhammer to install a screw in type.
BTW, please, make and model of jackhammer and bit used.
Here we have not just hard pan, but cemented hard pan, however zero rocks.
73
Rick N6RK
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