Processing Details of Core Components for Bailey Steel Bridge

Bailey Panels: The "Skeleton" of the Bridge

Bailey panels serve as the primary load-bearing structure, fabricated by welding upper and lower chord members, web members (vertical and diagonal braces), and connection plates. The processing procedures are as follows:

Chord Members: As the main load-carrying components, their manufacturing process includes:
Cutting: Using CNC plasma or laser cutting technology, Q345B or 16Mn steel plates are cut into "channel" or "I-beam" cross-sections. Laser cutting achieves a precision of ±0.5 mm.
Forming: Utilizing CNC press brakes to bend the material, ensuring angular deviation ≤±0.5°.
Drilling: Employing CNC drilling machines to bore pin holes at both ends, with hole diameter tolerance ≤±0.1 mm and concentricity error ≤0.1 mm. Chamfering (radius 2–3 mm) is applied along hole edges to prevent stress concentration.

Web Members: Comprising vertical and diagonal braces, typically made from 40Cr round steel. The process involves cutting to specified lengths, followed by turning on a lathe to achieve precise dimensions at both ends.