1. Scope This specification covers the design, materials, manufacture, testing, supply, and installation of Rocker Cum Roller Bearings for bridge structures. These bearings shall be designed to transmit loads safely from the superstructure to the substructure while allowing the necessary rotations and longitudinal movements of the bridge deck due to temperature variation, creep, shrinkage, and live load effects. 2. General Description A Rocker Cum Roller Bearing combines the features of a rocker bearing and a roller bearing. It consists of a roller assembly that allows longitudinal movement and a rocker plate or pin that accommodates rotational movement. This dual action permits the bearing to: Transfer vertical loads effectively, Allow controlled longitudinal displacement, and Permit angular rotation of the superstructure. The assembly ensures smooth operation, durability, and minimal maintenance during the service life of the bridge.

Steel truss bridge specifications cover geometry (span, width, truss type like Warren/Pratt), loads (dead, live, wind, snow), materials (corrosion-resistant steel), design codes (AASHTO/AISC), detailing (connections, members), and quality control (traceability, coatings) for safe, economical spans, typically 100-200+ feet, balancing strength with site needs. Key elements include member sizing for tension/compression, deck design for traffic, and load factor application, ensuring performance over varying spans. Key Specification Areas Geometric & Configuration: Span: Common range 75-250+ feet; defined by bearing centerline. Width: Varies with traffic (e.g., 2-lane, 3-lane). Truss Type: Warren (common, simple), Pratt, Howe, K-truss. Skew: Can be arranged to match site geometry.

A Strip Seal Expansion Joint is a widely used bridge expansion joint system designed to accommodate movements due to thermal expansion, contraction, and other factors while maintaining a watertight seal and providing a smooth riding surface. Below is a standard technical specification for Strip Seal Expansion Joints, suitable for bridge or highway works (can be adapted to project or regional standards such as ASTM, IRC, AASHTO, BS, or EN). 1. Scope This specification covers the design, supply, fabrication, and installation of Strip Seal Expansion Joints for bridges and structures. The system shall accommodate movements up to the specified range while ensuring water tightness, durability, and skid resistance.