A local contractor has contacted us to review the proposed foundation design for some high mast sports light poles. The concrete poles are 95' tall and will be embedded 15' into the ground as per the manufacturer. The poles were to be set in a 4' diameter hole and filled with concrete. The butt diameter of the poles are 29". The existing soil conditions did not permit a nice smooth 4' dia. shaft due to high ground water and lots of cobbles, so the contractor now has a much larger hole that they will dewater and fill with concrete by tremie method. The question I have is how long does the pole need to be supported by the crane before the concrete has enough strength to keep it erect and plumb?Thanks in advance.
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