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Old 15-09-2019, 11:19 AM
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Sunfish (Ray)
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Join Date: Mar 2018
Location: Wollongong
Posts: 1,909
A mass precast concrete footing with chemset bolts would be fine if it was sitting on compacted hardcore so it did not move and then back filled with hardcore. But you still need to get it there and dig the big hole and compact the bottom. Wet concrete in a fresh hole is easier. Hand digging a big hole is ok if you are fit and have the time.

I can not see why, if you have the access for a small track mounted machine you could not drill 3 , 450mm diameter holes 2m deep and fill them up with concrete , just like any building . Or even one would do. A contractor will drill and fill, with a barrow if required . With reinforcing in the top part you can then join by hand forming a small slab on top for the pier base, or chemset straight on. You can add a few extra piers for your future shed while you are there.
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