This standard specifies the requirements for materials, dimensions, manufacturing, finishing, and testing of precast concrete manholes. It covers the components like chamber sections, tapers, and cover slabs used in underground sewerage and drainage systems.
Covers requirements for precast concrete manholes including materials, dimensions, manufacture and testing.
Quick Reference Values
Minimum grade of concreteM20
Minimum clear cover to reinforcement25 mm
Maximum water absorption6.5 percent by mass
Minimum hydrostatic test pressure0.075 N/mm² (equivalent to 7.5 m head of water)
Minimum proof load (Type A, 1200mm dia)158 kN/m
Practical Notes
Ensure proper handling during transportation and installation to avoid damaging the spigot and socket ends, which are critical for a watertight joint.
Always verify the manufacturer's test certificates for proof load and hydrostatic tests before accepting the supply on site.
The code provides dimensions for different manhole types (A, B, C); ensure the correct type is selected based on the depth and anticipated traffic loads as per project design.