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I meant the bottom plate woudl be 30mm thick not 300mm wide.
Definately agree it needs to be a very wide bottom plate.
Dont have ability to poor concrete. Because its in my garage I need ability to remove it. I figure if I go with a very wide bottom plate and spread the load. even if it is only 50mm thick it might be ok as its 3.5 m wide and about 8 meters long worth of slab. I like idea of loxins as they are set flat to floor and I can remove pier if needed without bolts prottruding from floor. Issue is I need at least 80mm depth to use an M16 loxin.
As you suggest a 600 - 800 mm sqaure plate that is 30mm thick bolted into existing floor should do the job.
Thinking of a 12" pipe around 8mm - 10mm wall thickness,
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