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hi Chrys. I had the same sort of problem with sandy loam over 20m deep clay - no chance of getting to bedrock. FWIW, I tried a fairly solid concrete slab floating on the sand (1.2x1.2mx200mm). Left the treated pine formwork in place and poured a 75mm thick concrete working platform around it. The slab has about 80kg? of eq8+tripod+stuff on it and it hasn't moved after settling down (took about a year of occasional tweaking of the PA to correct for slow drift, but it has always been stable enough for imaging). The formwork isolates the slab and I can walk around on the work area without affecting the mount. I imagine that it would be easy to pour the slab with bolts for a pier, or even to use lock bolts. Cheers Ray
Last edited by Shiraz; 03-08-2021 at 12:27 AM.
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