IS 2911:2010 Part 1/Section 2 is the Indian Standard (BIS) for design and construction of pile foundations - concrete piles (bored cast-in-situ concrete piles). This part of IS 2911 covers the design, construction, and installation of bored cast-in-situ under-reamed piles. It is particularly crucial for designing foundations in expansive soils like black cotton soil to prevent uplift and settlement, and is widely used for transmission towers and lightly loaded structures.
Specifies design and construction procedures for bored cast-in-situ concrete piles.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Safety Approach | Working Stress Design with global Factor of Safety (typically 2.5 on ultimate load). | Limit State Design with partial factors on loads and resistances (e.g., γ_R = 1.4 for end bearing). | EN 1997-1 |
| Minimum Concrete Cover (to main bars) | 60 mm | 75 mm (for piles cast directly against soil) | BS 8004:2015 |
| Minimum Centre-to-Centre Pile Spacing | 3 x Pile Diameter | 3 x Pile Diameter is a commonly recommended minimum spacing. | ACI 336.3R-14 |
| Concrete Slump (for tremie placement) | 150 mm to 180 mm | Typically Class S4 (160 mm to 210 mm) or higher workability classes. | EN 1536:2010 |
| Minimum Longitudinal Reinforcement | 0.4% of gross cross-sectional area | 0.5% for piles resisting bending moments. | BS 8004:2015 |
| Positional Tolerance (at cut-off level) | 75 mm in any direction. | 75 mm for single piles or piles in a two-pile group. | EN 1536:2010 |
| Cut-off Level Tolerance (vertical) | +25 mm / -75 mm | ± 50 mm | EN 1536:2010 |