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I don't know if you can do this or want to but I mention it ...in my three piers ( actually two of which are three piers each) in my current observatory I drove star pickets into the ground fanning out from the pad (approx 45 degrees) ..the ends of the star pickets are covered in concrete so if you could stand the pad out in the yard above the ground the star pickets would look like legs holding up the pad..the star pickets give the pad in effect foundations ( the practice is called "Frankie Piling"). I have been lucky with all the star pickets that I have driven into the ground as they all went in as far as I wanted but I think it prudent to be have your angle grinder on stand by just in case you find they won't go all the way..if so cut off the length so it gets covered by the concrete and then drive the off cut into the ground ....I pity that poor person in the future charged with the demolition of my observatory and the piers as they will be met with a huge chunk of concrete under which are, from memory some 30 long star pickets and 30 short star pickets grabbing hold of the planet ... as I did not need form work the concrete from each pier joins haphazardly with the others so the slab now covers a triangle of 3 x 3 x 3 mtrs....and when I have concrete left over from a job I just dump it on that blob so it grows.
Alex
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