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The soil is clay
Hi,
The one leaf swing gate is 700lb ,8'H, 12' long. Post is 6"x 1/4". What should the diameter and dept of the hole in the ground be?
Re-think it.
Picture a paved carpark.
"H" shaped frame. Large OD galvanized pipe OR medium I-beams OR Heavy pressure-treat timber OR ferrocrete OR precast reinforced concrete beams if you are into that sort of s**t.
Crossbar of the "H" is your opening, plus 1/4 of it past, each end.
For a 12 foot opening, that's an 18-foot beam. Composite is OK. Need not be one-piece. TWO parallel runs are OK too, pipe frame especially.
"legs" of the "H" are each half the crossbar long, 1/4 of the opening in from its ends.
For your 12-foot opening, they are six feet long, cross 3 feet in. Longer, swing-open side, is OK, too.
Diagonal braces run at a 45-degree from 2/3 height of posts down to wherever TF they hit the base frame, three sides of each post. Eg: not at the open side.
ONE sandbag at the end of each of the "verticals" of the "H"?
Your gate should NOW be stable sitting naked on the carpark surface.
You could dooo that "surface mount" by making your "H" verticals become kerbs.
Otherwise, rent you a trackhoe. Cut your trenches to fit, prepare to bury as deadmans.
Compact 3" gradation bluestone O/E (VDOT 21A here). Concrete optional
Set the above H+ frame, level and plumb. Concrete optional over.
Compacted gravel, crusher-run, then ignorant dirt will do yah.
Soil type no longer much matters. It was Monongahela Red, our case.
Dunno if it is good for more that 70 years or not.
We only kept the farm for 80 years.
The "BFBI" (Brute Force and Bloody Ignorance) way AKA "more 'crete, please, we're REDNECKS!" is simply too hard to predict, wants holes dug too deep for good sense. Rock was under that clay soil.
Support wheel at the swing end is nearly ALWAYS a good idea. Very nearly. Do not skimp. Use a decent sized one.
Two six-foot leaves are waaaaay easier than one 12-footer.
Rolling bypass / sliding / telescoping gates are USUALLY better than swing. No cantilevering required.
2CW
did you not understand? The OP didn't ask for how to design and build a gate. He gave us what he had to work with. Since he asked for the size and depth of hole in the ground, one can assume that the 6" post is not long enough to drive it down 20 feet or more. Concrete is cheap compared to what a gate of that size cost and is a well respected method of construction, certainly not REDNECK.The one leaf swing gate is 700lb ,8'H, 12' long. Post is 6"x 1/4". What should the diameter and dept of the hole in the ground be?
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