| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. STRUCTURAL INTEGRITY | |||
| A1 | Shaft pit depth measurement and verification Acceptance: Pit depth within ±25 mm of design depth; no water accumulation | Cl. 4.1.1 — Minimum pit depth as per design | OK NC NA HOLD |
| A2 | Shaft top headroom clearance Acceptance: Clearance ≥ 1.0 m; no obstructions | Cl. 4.1.2 — Minimum 1.0 m clearance above car roof | OK NC NA HOLD |
| A3 | Shaft wall plumbness Acceptance: Plumb tolerance ≤ 1:500 over height; max 25 mm | Cl. 4.2.1 — Shaft walls must be plumb | OK NC NA HOLD |
| A4 | Concrete surface finish and defects Acceptance: No honeycomb, voids, or surface cracks; smooth finish for rail mounting | Cl. 5.2 — Acceptable surface finish per IS 456 | OK NC NA HOLD |
| A5 | Shaft dimensions (width × depth) verification Acceptance: Width and depth ±20 mm of design; consistent along height | Cl. 4.1 — Shaft dimensions as per design | OK NC NA HOLD |
| B. PIT AND FOUNDATION | |||
| B1 | Foundation/pit base condition Acceptance: Solid, level surface; bearing capacity ≥ 100 kPa; no cracks | Cl. 4.3 — Pit foundation must be stable | OK NC NA HOLD |
| B2 | Pit drainage and water management Acceptance: Effective drainage system; pit remains dry; slope towards drain ≥ 1:50 | Cl. 4.3.1 — Adequate drainage provision | OK NC NA HOLD |
| B3 | Pit access and ladder provision Acceptance: Access hatch ≥ 0.6×0.6 m; ladder fixed and secure; handrails present | Cl. 4.4 — Safe access to pit required | OK NC NA HOLD |
| B4 | Pit floor level and gradient Acceptance: Level within ±15 mm; minimum gradient 1:100 towards drain | Cl. 4.3 — Pit floor must be level | OK NC NA HOLD |
| C. RAIL MOUNTING SURFACES | |||
| C1 | Rail seating area preparation and flatness Acceptance: Flatness ≤ 2 mm over 2 m; clean, free of loose material | Cl. 6.1 — Rail seats must be flat and level | OK NC NA HOLD |
| C2 | Corbel or bracket locations verified Acceptance: Bracket spacing ≤ 4 m; center-to-center ±10 mm of design; securely fixed | Cl. 6.2 — Brackets positioned to design | OK NC NA HOLD |
| C3 | Dowel or anchor bolt setting Acceptance: Bolts set to design depth; no corrosion; nut threads not damaged | Cl. 6.3 — Anchors properly embedded | OK NC NA HOLD |