This standard specifies the requirements for materials, design, fabrication, testing, and installation of prefabricated modular strip/box seal expansion joints for bridges. It covers functional aspects like movement accommodation, load transfer, watertightness, and durability, with a strong emphasis on fatigue resistance.
Earlier specification for material, design, manufacturing, testing, and acceptance requirements for modular expansion joints in bridges.
Quick Reference Values
Watertightness test condition50 mm constant water head for 24 hours with no leakage
Fatigue test cycles for National Highways2 x 10^6 cycles
Hardness of elastomeric seal (Shore A)63 ± 5
Minimum tensile strength of steel for centre/edge beams410 MPa
Maximum gap between centre beams at max opening85 mm
Practical Notes
Installation is as critical as design; improper installation, particularly anchor placement and concrete preparation, is a major cause of premature failure.
Watertightness is paramount to prevent corrosion of underlying girders and bearings. Regular inspection and maintenance of seals are essential for long-term performance.
Always verify that the manufacturer provides a valid fatigue test certificate for the specific joint model and movement range, as required by Clause 9.