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712 posts

Ultimate Geek
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  Reply # 1652746 18-Oct-2016 10:44
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For the OP , 'flange' meaning there is a thing you make and bury in the concrete with the top poking out. The gate post then bolts to it.

 

As an example here's a road side structure being installed while already attached to its' flange (this is a bit different in that the bolts are designed to snap off when hit by a car)

 

Strong as feck.

 

 


664 posts

Ultimate Geek
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  Reply # 1652843 18-Oct-2016 13:22
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You don't need to overthink it.. That 600 square 500mm deep foundation should do it.

 

Three years ago we concreted in a bunch of 6m IP camera poles out in the bush.
Dug some holes roughly 1m deep and 500x600mm, mixed the concrete at 6:1 in a standard contractors size mixer, 6 or so wheelbarrows per hole.

 

We used M20 threaded stainless rod and nuts to hold the 400x500mm 12mm base plates down, tacked onto 10mm rebar bent into a rough rectangle to keep them located.

 

Very roughly surfaced the concrete, leveled up the poles using stainless washers as spacers then grouted the surface before bolting the plates down.

 

The 150x150 steel poles have remained upright in very strong (170km/h) winds, salt spray, the shock loading of a large tree falling against one, and a 100kg mate shimmying up them occasionally to clean the lenses.
Rough as, but would have been simple to make them look nicer, and easily strong enough to swing a 3m galv steel gate off.

 


 
 
 
 


1854 posts

Uber Geek
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  Reply # 1652889 18-Oct-2016 14:05
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Best practice would be to cut out a hole in current concrete pad, dig a hole and concrete in the post.

 

 

 

You could get away to bolting it to the concrete slab but it likely won't last.




67 posts

Master Geek
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  Reply # 1657514 25-Oct-2016 15:23
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elpenguino: