Acceptance under IS 12843 is by survey: the erected structure's plumb, level and alignment are measured and compared to the specified tolerance class. Within tolerance → accept; out of tolerance → it is not an automatic reject but requires an engineering assessment of the structural effect (eccentricity/second-order/fit) and correction or documented justification before sign-off.
Key Requirements
•Survey the erected geometry (plumb, level, alignment, position) with adequate instruments
•Compare against the SPECIFIED tolerance class (contract-stated; IS 12843 default)
•Within tolerance → accept; out of tolerance → assess structural effect (eccentricity/P-Δ/fit), then correct or justify
•Document the survey and any accepted deviations with the engineering justification
•Sign-off only after the as-built is within tolerance or assessed acceptable
Practical Notes
✓Out-of-tolerance is not automatically a reject — but it is never an automatic accept either: it requires an engineering assessment of the eccentricity/second-order consequence.
✓An undocumented erection survey is a sign-off and dispute risk — record geometry and any justified deviations.
Common Mistakes
⚠No erection survey / no specified tolerance class to judge against.
⚠Blindly accepting (or blindly rejecting) out-of-tolerance without structural assessment.
⚠Signing off without documenting the survey and accepted deviations.