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Looks like a caisson job, precast rings, with a leading cutting edge, sinking under their own weight as soil is extracted from inside.. Boreholes probably easier, hand augering might be possible even easy.
Alan
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Looks like a caisson job, precast rings, with a leading cutting edge, sinking under their own weight as soil is extracted from inside.. Boreholes probably easier, hand augering might be possible even easy.
Alan