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When my dad and I built his dome he drilled a 250mm hole down 6m into the clay and bedrock, filled it with rio and has a 500x500mm brick and concrete column coming out of the ground about 1.5 metres.
The domes 170mm thick reinforced concrete floor is independent of the pier which is separated by 10mm of styrofoam to minimize vibration. The dome itself is cemented into place rather than dynabolts etc..
On top of that we have an adjustable leveling platform which can be adjusted whenever necessary and that has 450mm bolts chemically bonded into the pier at 6 points.
As a result of this over engineering I can slam doors and do star-jumps inside the dome with no effect on the image at 3500mm focal length :S
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