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Continue to ChatIS 2911(PART 1 SEC 1) 1979 INDIAN STANDARD CODE OF PRACTICE FOR DESIGN AND CONSTRUCTION OF PILE FOUNDATIONS PART 1 CONCRETE PILES SECTION 1 DRIVEN CAST IN-SITU CONCRETE PILES. https://civilengineer.co.in/indian-standard-codes/is-2911part-1-sec-1-1979-indian-standard-code-of-practice-for-design-and-construction-of-pile-foundations/