[TowerTalk] [Bulk] Rohn 25G tower permitting

[Brian Carling]

No freezes here in the subtropics. Yes!

Best regards - Brian Carling
AF4K Crystals Co.
117 Sterling Pine St.
Sanford, FL 32773

Tel: +USA 321-262-5471




> On Jan 29, 2015, at 6:57 PM, Grant Saviers <grants2 at pacbell.net> wrote:
> 
> 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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