John Lyles wrote:
> I am finishing up a 25G install at QTH this weekend, and it is 46
> feet tall. It has 2 sets of guys, out at 32-33 feet from the base. I
> used Hubble Bust-type anchor rods and plates, which are sunk 6 feet
> into a diagonal hole 45 deg. With good soil, they are rated for up to
> 10,000 lbs, and are only $25 an anchor. Power company uses them for
> guying poles. I trusted these, but using pipe and concrete like you
> are suggesting, hmmm, you better have an expert comment on this. I
> would be afraid of having the concrete shift for those too, in the
> wind, esp if your ground is that soft. Best to do a real concrete
> dead load deep in the ground with the force pulling directly in line
> with the anchor rod (not pipe).
>
One way to get the clearance, AND use a decent anchor like John mentions..
Use the short section of pipe as a "spacer".. the guy comes off the
anchor up the half dozen feet to the top of the pipe, and then to the
tower. This makes the tension load in the guy into a straight
compression on the heavy pipe (which you can fill with concrete, if you
like), so then it's a matter of whether the concrete pad for the pipe is
big enough to "float" the pipe and the down load.
You'd have to have someone do the calculations on this, but it's a
fairly common thing where, for instance, they have a wooden power pole
next to a sidewalk and need to run the guy across the sidewalk and keep
it high enough so that you have clearance.
It's NOT going to fix the basic problem of having the anchor point close
to the base of the main tower, so the loads are high.
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