Strip Seal Expansion Joint for Bridges with Sidewalks

Strip seal expansion joints at sidewalk locations on bridges must meet pedestrian safety requirements in addition to the structural and waterproofing requirements. The joint surface must be slip-resistant, and the gap width must be limited to prevent pedestrian trips and falls. Gap width limitation for pedestrian areas is more stringent than for traffic areas. The maximum gap width for pedestrian areas is typically 13 mm to prevent high heels and walking aids from becoming trapped. The joint must be designed to maintain this maximum gap width throughout the movement range. Slip resistance of the joint surface is critical for pedestrian safety, particularly in wet conditions. The joint surface must have a minimum slip resistance value as specified by the applicable accessibility standard. EPDM seals have adequate slip resistance for most pedestrian applications. Metal cover plates must have a textured surface to provide slip resistance. Cover plate design for pedestrian strip seal joints uses a metal plate that spans the joint gap and provides a smooth, slip-resistant surface for pedestrians. The cover plate must be designed to support the pedestrian loading without excessive deflection. The plate must be removable for seal inspection and replacement. Accessibility requirements for pedestrian bridge joints must comply with the applicable accessibility standard. The joint must not create a barrier to wheelchair users or persons with mobility impairments. The maximum gap width and the maximum step at the joint must comply with the accessibility requirements. Maintenance of pedestrian bridge joints requires more frequent inspection than traffic area joints because the consequences of joint failure are more severe for pedestrians. Annual inspection should check the gap width, the slip resistance, and the condition of the cover plate. Any damage must be repaired promptly to maintain pedestrian safety.