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|Ground post depth?|
|Topic Started: 16 Apr 2012 - 10:40 (147 Views)|
|Wayne1965||16 Apr 2012 - 10:40 Post #1|
26 Charlie Tango 1965
I am in the process of building my own tower which will be tilt over only so not height adjustable total length about 10M, I am having one 21 foot length of heavy duty scaffold pole 2'' diameter then a smaller pole 2'' diameter ally light weight on top of that.
I am fixing these to a 4x4 inch square box section for the winch but how much should I have it buried, its just over 9foot long total so thought 5 underground and 4foot above, would this be sufficient to manage the weight as its being tilted over, I am planning to have an Antron 99 on the very top and a ZL beam for 2m (7 element) under that with a small rotator.
The post will be concreted in so its just conformation that 5foot deep and about 2foot square will hold it stable through all weather.
I have never done anything like this not even a fence post before
Many thanks all advice welcome please
|Yagi 3||16 Apr 2012 - 15:20 Post #2|
26 Charlie Tango 760
Hi Wayne, when living at home i ran a similar set up 21ft scaff pole plus 8ft pole, these where pinned to two outer holding poles concreted in 4ft and hinged at the bottom of the pad.
On the tower sat a 14ft alloy 2inch scaff bar as the boom, very thick walled and a 3 element beam with h section saddles that made a Joe Gunn beam look flimsey! I used a large twin brake rotator that used to turn a six eley of the same calibre.
I had roughly a good cube of concrete with in the base, 4ft wide and deep with it widening out to base bottom which i mixed and dug out myself.
The tower along with beam stood up to all weathers, the beam went long ago but my dad still uses the tower with a ten foot pole on along with a topone to this day.
The key is when mixing concrete not to mix it like lash as water weakens the mix, i would do 5 to 1 equal ratio ballast to cement and 5ft deep will be ok but 2ft wide would wurry me, its the depth and width together that make the weight, the footprint hold is the key. I would go at least a metre wide.
My bricklaying expertise may be overkill but i have never had anything drop down as yet. Foundation pads for high structures need to be wide as well as deep.
Edited by Yagi 3, 16 Apr 2012 - 19:16.
|Sam WD40||16 Apr 2012 - 17:39 Post #3|
26 Charlie Tango 747
|For a good referance get your self a builders bag (1ton jobbie)and i i would bue filling it up with your pole in the ground under it half with hard core the other half with concrete job done no worries !|
|Wayne1965||16 Apr 2012 - 21:55 Post #4|
26 Charlie Tango 1965
for the information, thinking on it a little more and from what's been suggested I think I will keep it at 5 foot deep but make it 4 foot square so double my first plans.
I may also make the bottom of the hole a foot wider also as suggested, but I don't want a large amount of concrete showing on top so when its gone off put some of the grass back so only about a foot of the concrete is actually showing around the base of the 4x4 post.
I may also make it so the post can be taken out just incase we move or because of objections from the neighbours or the council.
Keep the suggestions coming in if there is any thing else I need to be thinking of as we are not starting until next weekend weather permitting
73 many thanks.
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