All Chance anchor specs can be found here:
http://www.hubbellpowersystems.com/POWERTEST/literature_library/pdflib_eanch.html
Tom, N4NW
At 04:27 PM 11/14/2009, John Langdon wrote:
>If these are the Chance style anchors, as I recall there is a chart that
>shows pull out force by type of anchor (size and number of helices on it)
>and soil type, given that the anchors are screwed in to a given torque
>value. I think the spec is force along the axis of the anchor. They can be
>very strong if properly installed, but that is normally done by a trained
>installer that sells the anchors.
>
>73 John N5CQ
>
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com] On Behalf Of Gene Fuller
>Sent: Saturday, November 14, 2009 3:02 PM
>To: donovanf@starpower.net; towertalk@contesting.com
>Subject: Re: [TowerTalk] New Tower installation
>
>Hi Rex -
>
>Another two cents worth -
>
>A four foot shank sounds a bit short, even though installed at a 50 degree
>angle it still has to pull tthrough 4 feet of earth. Remember that closer
>to the surface the soil is not as compact and would offer less resistance
>than deeper. If, including some of the tower, the effective surface area
>would be at least 10 square feet, at 30 psf wind pressure you would have a
>300+ lbs horizontal force, which, translated down to a 50 degree guy angle
>would look more like 400-450 + lbs, again, perhaps a challenge for a 4 foot
>anchor rod only 3 feet deep - especially since 30 pfs may be on the light
>side and higher gusts, and a bit of pumping. I agree with Frank - 6 foot
>minimum.
>
>Gene / W2LU
>
>----- Original Message -----
>From: <donovanf@starpower.net>
>To: <towertalk@contesting.com>
>Sent: Saturday, November 14, 2009 2:10 PM
>Subject: Re: [TowerTalk] New Tower installation
>
>
>Rex,
>
>Four feet is unusually short for a guy anchor. When you set that anchor in
>at an angle, as you must, it will be buried less than three feet below the
>surface. An appropriate anchor should be at least six feet long.
>
>73
>Frank
>W3LPL
>
>---- Original message ----
> >Date: Sat, 14 Nov 2009 13:52:20 -0500
> >From: "Rex Lint" <rex@lint.mv.com>
> >Subject: Re: [TowerTalk] New Tower installation
> >To: <towertalk@contesting.com>
> >Cc: "'Michael Ryan'" <mryan001@tampabay.rr.com>
> >
> >
> >DAVE,
> >
> >..."or do I need to angle them at 50 deg. as stated in the Rohn
> >spec's."
> >That should be taken as the answer... if it didn't make any difference,
> >they
> >wouldn't specify it. Don't forget LXC's maxim - do what the manufacturer
> >says.
> >
> >I once climbed a tower where the guy rods were put in sticking STRAIGHT UP.
> >I won't do THAT again - it wobbled like a noodle.
> >
> > -Rex-
> >
> > K1HI
> > Rex Lint
> > Merrimack, NH
> >
> >
> >-----Original Message-----
> >From: towertalk-bounces@contesting.com
> >[mailto:towertalk-bounces@contesting.com] On Behalf Of Michael Ryan
> >Sent: Saturday, November 14, 2009 1:11 PM
> >To: 'Dave'; towertalk@contesting.com
> >Subject: Re: [TowerTalk] New Tower installation
> >
> >I would install at an angle, if not sooner or later they are going to want
> >to lean in the direction of the tower at the angle they were supposed to be
> >installed at in the first place. You will constantly be re-tightening your
> >guy wires. - Mike
> >
> >-----Original Message-----
> >From: towertalk-bounces@contesting.com
> >[mailto:towertalk-bounces@contesting.com] On Behalf Of Dave
> >Sent: Saturday, November 14, 2009 1:01 PM
> >To: towertalk@contesting.com
> >Subject: [TowerTalk] New Tower installation
> >
> >I have just put up a Rohn 25G. My question is, and I haven't researched
> >the
> >archives due to the interest of time before the snow blows. Can I use the
> >3/4" x 4' screw anchors with 6" blade to secure the tower with out using
> >cement. If I just screw them in all the way straight down, no angle, will
> >they hold, or do I need to angle them at 50 deg. as stated in the Rohn
> >spec's.
> >I would like some feedback on this way of doing it. These things are
> >suppose to hold trailers down. Are they reliable enough for the tower.
> >Wind load on the only beam is 6.9 sq. ft. with a 10' 2" mast.
> >
> >Thanks, Dave
> >_______________________________________________
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