Bored pile center-to-center spacing rules and standards
Standard structural engineering rules requiring minimum center-to-center pile spacing of 2.5 to 3.0 times pile diameter.

Center-to-center 2.5D-3.0D rule
Minimum center-to-center clearance between adjacent bored piles in a footing must measure at least 2.5 to 3.0 times pile diameter.
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