Gate post for 20 ft gate

mr.stonewall

Have to change access gate to yard. Currently 2 16fts gates. Will have to make one 20ft. Just wondering what's size or type of gate poste would people use. Thinking 8x4 rsj set to a depth of 4 in concrete.

Keep Sluicing

mr.stonewall wrote: »

Have to change access gate to yard. Currently 2 16fts gates. Will have to make one 20ft. Just wondering what's size or type of gate poste would people use. Thinking 8x4 rsj set to a depth of 4 in concrete.

If you can get 4 feet into concrete, that would be good. But 3 feet would probably be ok too.

patsy_mccabe

There will be crazy weight in a 20 foot gate. I hung a 17ft a while back off a railway girger, that was part of a small run of concrete for a cattle crush.
I try and go 3 foot deep in good solid ground. Soft ground and it doesn't atter how deep you go, it will move in the ground.

tanko

Could you put in two ten foot gates instead?

Anto_Meath

Any chance of putting support under the opening side like a wheel, as when you cross 16ft with a gate it puts a lot of pressure on a gate post.

Gman1987

I find the 8x4 tend to twist a bit when you have the gate open. Might be better with a bigger RSJ for a 20ft. Also if using RSJ you might be better to weld a plate the top of the RSJ and this will help prevent them twisting. Would you consider the round galvanized posts from Gibney?

mr.stonewall

tanko wrote: »

Could you put in two ten foot gates instead?

Can't go with 2 10fts. Opening is currently 32 ft with 2 16 fts

mr.stonewall

Gman1987 wrote: »

I find the 8x4 tend to twist a bit when you have the gate open. Might be better with a bigger RSJ for a 20ft. Also if using RSJ you might be better to weld a plate the top of the RSJ and this will help prevent them twisting. Would you consider the round galvanized posts from Gibney?

Thanks for the tip of the top plate. Might weld anchors so the grip in concrete

mr.stonewall

Keep Sluicing wrote: »

If you can get 4 feet into concrete, that would be good. But 3 feet would probably be ok too.

Depth not an issue as I can dig it out with the 3cx here ( old but a God send)

Just getting caught with loading cattle lorry. The ain't getting smaller. Gates we're in place for the milk lorry in the past and off course crush and pens beside it. Was thinking of a wheel to support it

DBK1

If you could use a heavy box iron, maybe 6” square, and weld on hangers it would be far superior to an RSJ. No twisting or movement at all. I’ve heavy duty 15 foot mesh gates hanging off 6” x 6mm wall box and they are very solid.

Dunedin

Why not go with 2 16’ gates but have post set in slieve in the middle so you can take up when the cattle lorry is coming but the one 16’ gate opening will suffice 90% of the time.

Who2

An 8 x4 won’t be near adequate for a 20’ Gate. I’ve 14 and 16’ hates hung on 8x4 concreted in and they twist and spring depending on where the gate is in position. 10x10 or heavier especially if it’s into the yard.