[TowerTalk] [Bulk] Rohn 25G tower permitting

[Grant Saviers]

My 140' Rohn 65 base is 4x4x2 ft. PE engineered.  So 3' of concrete is a 
bit much, check the Rohn catalog.  The most important thing with a base 
in concrete is the legs go through it and into some gravel for 
drainage.  I've seen many legs split by water freezing in them.

I wouldn't go as far as "3/4 ply and broomsticks" but the loads from 30' 
won't need much of a base for 2000psi soils.  It's all in the catalog.

Grant KZ1W


On 1/29/2015 10:10 AM, Wilson wrote:
> I think you are being led around by the short hairs.
> How did you decide a 27’ tower needed to be in 3’ of concrete?
> For practical purposes there is no bending and no horizontal load at the base of this tower, assuming it is guyed, of course, which –25 must be.
> You could stand 30’ of 25 on a piece of 3/4” plywood and three broomsticks and have a fine installation!
> The guywire and anchors are your real design hotspots, so a reasonable estimate of overturning moment is necessary.
> With it, you figure the worst guyline load and that gives you an anchor capacity requirement.
> You may have the perfect place for some screw in anchors, or an ideal place to display some heavy yard art!
> Yes, you’ll have a little horizontal load due to drag on the tower itself, if it’s in the clear, so maybe use rebar or pipe instead of the broomsticks.
> I have a 2’ square pad and a tilt plate for mine (40’) and it’s overkill.  The tilt plate is great for antenna maintenance.
>
> And are you required to tell them all about the antennae to be installed?
> The less you tell them, the better, since you’ll be changing eventually anyway.
>
> WL
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