| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. PRE-PILING SURVEY & SITE PREPARATION | |||
| A1 | Pile layout survey verified against drawing — pile position tolerance ±75mm plan view (CL to CL) Acceptance: Survey certificate filed; pile center lines marked; tolerance check documented with theodolite/total station | Mandatory | OK NC NA HOLD |
| A2 | Pile schedule reviewed — type, diameter, length, design capacity, rebar schedule, concrete grade, bearing stratum depth Acceptance: Schedule document signed by structural engineer; all piles listed with unique ID; capacity vs load verified | Mandatory | OK NC NA HOLD |
| A3 | Bore log from investigation matched with site — geotechnical report consulted; strata depths and soil type confirmed Acceptance: Bore log copies on site office; expected strata compared with actual strata during boring | Mandatory | OK NC NA HOLD |
| A4 | Working platform level and stable — minimum 3m clear working radius, platform can support rig weight + 50% safety margin Acceptance: Platform compacted to ≥95% MDD; rig resting on level surface; no settlement during test run | Mandatory | OK NC NA HOLD |
| A5 | Piling rig capacity adequate — rig rated for max pile length, weight, boring/driving method per schedule Acceptance: Rig specification sheet reviewed; capacity ≥1.2× max design load; rig certification current | Mandatory | OK NC NA HOLD |
| A6 | Bentonite and/or polymer slurry ready for bored piles — source approved, quality cert provided, quantity estimated Acceptance: Slurry supplier approved; material safety data sheet on file; sufficient quantity on site for planned boring | Conditional | OK NC NA HOLD |
| A7 | Casing and drilling tools available — casing size, drill bits, stabilizers, risers, kelly ready for deployment Acceptance: Equipment list checked; all tools present on site; maintenance records available; no defects visible | Conditional | OK NC NA HOLD |
| A8 | Rebar cage steel delivery verified — grade Fe500D or Fe550D (IS 1786), quantity, dimensions match drawing Acceptance: Material certificate (Mill Certificate) filed; bars labeled; quantity count verified; storage protected from weather | Mandatory | OK NC NA HOLD |
| B. BORING / DRIVING EXECUTION | |||
| B1 | Pile position marked and identified — pile ID marked on marker peg; position cross-checked before drilling starts Acceptance: Pile ID visible; survey marks in place; no accidental drilling of wrong position | Mandatory | OK NC NA HOLD |
| B2 | Boring commenced — drilling method (rotary/wash/auger) as per design; bore log maintained with depth and strata changes Acceptance: Boring log sheet filled daily; depth increments recorded; soil color, texture, consistency noted; log signed by driller | Mandatory | OK NC NA HOLD |
| B3 | Strata record matches geotechnical investigation bore log — soil type, strata thickness, hardness consistent with expectations Acceptance: Boring log cross-checked with invest. report; major deviations flagged; geotechnical engineer notified if significant change | Mandatory | OK NC NA HOLD |
| B4 | Founding level confirmed by geotechnical engineer — final depth approved; bearing stratum reached per investigation report Acceptance: Geotechnical engineer site inspection; bore log depth matches design depth; email/memo confirming founding level filed | Mandatory | OK NC NA HOLD |
| B5 | Hard strata encountered — if hard layer hit, chisel, bailer, or light percussion tool used; boring depth tolerance ±150mm Acceptance: Boring depth recorded; if unable to bore deeper, final depth ≤150mm above design depth acceptable with engineer approval | Conditional | OK NC NA HOLD |
| B6 | Bore stability maintained — bentonite slurry level maintained if slurry boring (typically 1-2m above groundwater table minimum) Acceptance: Slurry level checked regularly; slurry density 1.05-1.25 t/m³; no caving observed at bore walls | Conditional | OK NC NA HOLD |
| B7 | Final depth achieved — bore depth matches design with tolerance ±150mm or founding stratum confirmed, whichever is stricter Acceptance: Boring depth measured and recorded; log signed; geotechnical engineer approval documented; pile ready for cage insertion | Mandatory | OK NC NA HOLD |
| B8 | Bore cleaning completed — bailer or suction used to remove cuttings; bore bottom loose material removed before cage insertion Acceptance: Bore cleaned until water returns clear; loose material removed; bore ready for cage within 24 hours of cleaning | Mandatory | OK NC NA HOLD |
| C. REINFORCEMENT CAGE ASSEMBLY & PLACEMENT | |||
| C1 | Rebar cage dimensions verified — diameter, length, number of bars match drawing (IS 1786 grades verified from cert) Acceptance: Cage measured against drawing; dimensions within ±10mm; bar grade visible on bar labels; Mill Certificate filed | Mandatory | OK NC NA HOLD |
| C2 | Main bars — correct number, diameter, grade per drawing; bars straight, no visible defects, splices if needed per IS 456 Acceptance: Bar count verified; diameter measured (calipers); grade Fe500D or Fe550D; lap length = 50 Ø for tension per IS 456 | Mandatory | OK NC NA HOLD |
| C3 | Links/spirals at correct spacing — typical spacing 150mm at top/bottom 3D depth, 300mm in middle section per IS 456 Cl. 26.5.3.3 Acceptance: Link spacing measured with tape; documented on cage label; spacing tolerance ±25mm acceptable | Mandatory | OK NC NA HOLD |
| C4 | Cover spacers in place — min. 75mm nominal cover for bored piles (IS 456 Cl. 26.4.2.1), spacers at 1m spacing vertically Acceptance: Spacers of correct thickness (75mm) installed; evenly spaced (max 1m gap); spacers secured to rebar | Mandatory | OK NC NA HOLD |
| C5 | Lifting hooks installed — 4-point or 2-point hooks per cage weight; hooks welded at 90° angles; design capacity ≥1.5× cage weight Acceptance: Hooks welded properly; welds inspected; cage weight estimated; hook capacity ≥1.5× weight; marked on cage | Mandatory | OK NC NA HOLD |
| C6 | Cage lowered without damage — lowering speed controlled (<0.5 m/s), guides used if narrow bore, no dragging or rotation Acceptance: Lowering supervised by site engineer; visual inspection for cage distortion; no bars bent or broken upon arrival at bottom | Mandatory | OK NC NA HOLD |
| C7 | Cage position checked — centrality within bore (within ±50mm of centerline); cage sitting on bottom or suspended at correct depth Acceptance: Centrality check using spirit level / plumb bob; cage not touching bore walls; cage depth measured from rig | Mandatory | OK NC NA HOLD |
| C8 | Cage projection above cut-off level — main bars project min. 500mm above cut-off level for dowel action in cap beam Acceptance: Projection measured; min. 500mm above design cut-off; excess length to be cut after concrete curing | Mandatory | OK NC NA HOLD |