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Peter
I agree with David
That pier is way to high without a reo cage or reo rods all the way into the footing encasement. There is no tensile strength in concrete without steel reo especially in that configuration
My piers are only 500mm high out of the ground ( 400mm in the ground ) and 250mm in diameter and I used 6 x M12 reo rods through the pier and into the footings
I know it’s painful, but I would pull it down and start again mate
Also at that height I would use a 300mm diameter pier as a minimum plus a 450 x 450 concrete plinth with reo into the footings , around the base up at least 500mm
Then it ain’t going anywhere !!
Cheers
Martin
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