Key Steps and Quality Control in Bailey Steel Bridge Erection

Several critical stages directly determine the safety and service life of the bridge during actual construction:

Precise Assembly of Truss Units: Bailey panels are connected using pins, and it is essential to ensure all pins are properly installed and secured with safety cotter pins to prevent loosening. High precision is required- for example, the deviation of the main truss center spacing must be controlled within 2.5 mm (for bottom-supported bridges).

Secure Deck System and Connections: The deck plating and cross beams must be firmly connected to the Bailey trusses to form an integrated load-bearing structure. Standard cross beams should be locked in place with clamps, while the deck plating must be fixed to the Bailey beams using specialized connectors such as "ship-shaped clips." Additionally, lateral connecting plates should be installed between each set of Bailey beams to enhance overall bridge stability.

Safe Lowering and Positional Restraint: Once the bridge has been pushed into its designed position on the opposite bank, jacks must be used in synchronized operation to gently lower the bridge onto the abutment bearings-any impact during this process is strictly prohibited. After positioning, limiters (such as U-shaped clamps) must be installed to lock the lower chord members of the bridge to the cross beams, ensuring secure fixation.