| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. Pile Installation Compliance | |||
| A1 | Pile position survey — Location within ±75 mm of design coordinates (horizontal) Acceptance: Deviation ≤ ±75 mm from design position; for closely-spaced piles, minimum 75 mm clearance maintained between pile shafts | IS 2911 Part 1 Clause 8.2 (Setting out tolerance) | OK NC NA HOLD |
| A2 | Boring/Driving depth — Actual depth matches design depth ±150 mm Acceptance: Depth achieved within design ±150 mm (e.g., design 20 m = 19.85 to 20.15 m actual); founding stratum confirmed by geotechnical engineer | IS 2911 Part 1 Clause 6 (Design and Execution) | OK NC NA HOLD |
| A3 | Founding stratum verification — Actual stratum matches bore log prediction Acceptance: Stratum description (colour, SPT N-value, consistency) matches investigation report; discrepancies flagged for geotechnical review before concreting | IS 1892 and IS 2911 Part 1 Clause 5.1 (Foundation design) | OK NC NA HOLD |
| A4 | Concrete grade and slump — Grade per design (typically M25–M35), slump 150–180 mm (bored piles) Acceptance: Concrete grade ≥ M25; slump 150–180 mm for tremie placement; design mix tested; cube samples taken minimum 1 set per 5 piles or per 5 m³ | IS 456 Clause 5.2 (Workability and slump), IS 2911 Part 1 Clause 9 (Concreting) | OK NC NA HOLD |
| A5 | Reinforcement cage — Cover ≥75 mm, cage length as design, centrally positioned Acceptance: Concrete cover 75 mm minimum (75 mm in soil, 50 mm in saline/aggressive); cage length ≥ {pile depth − 2 m} OR as design; spacers at 1.5 m intervals | IS 456 Clause 26 (Cover), IS 2911 Part 1 Clause 8.3 (Reinforcement) | OK NC NA HOLD |
| A6 | Concrete volume — Actual volume within ±5% of theoretical (accounting for overbreak) Acceptance: Overbreak ratio ≤ 0.10 (i.e., actual volume ≤ theoretical × 1.10); volume discrepancy ±5% acceptable; excess may indicate casing leakage | IS 2911 Part 1 Clause 9.2 (Quality control in concreting) | OK NC NA HOLD |
| A7 | Pile verticality — Max deviation 1 in 150 of pile length (or ±75 mm over depth) Acceptance: Tilt ≤ 1:150 measured by inclinometer or transit; for 20 m pile, max ~133 mm tilt; tilt > 1:150 requires structural engineer review | IS 2911 Part 1 Clause 8.2 (Verticality tolerance) | OK NC NA HOLD |
| A8 | Pile integrity testing — All piles subjected to low-strain or cross-hole sonic logging Acceptance: PIT (Pile Integrity Test) or CSL (Cross-Hole Sonic Logging) performed ≥7 days after concreting; no major defects (necking, voids >1 m³) detected; report issued | IS 2911 Part 1 Clause 11 (Testing) | OK NC NA HOLD |
| A9 | Pile load test — Proof test 2.5× working load per IS 2911 Part 4 (typical 1–2% of piles) Acceptance: Test load 2.5× working load; settlement at working load ≤12 mm single pile (or per design); no net settlement; results certified by testing agency | IS 2911 Part 4 Clause 7 (Static load test procedure) | OK NC NA HOLD |