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The Model 321 bridge is a through-type steel truss bridge. The truss unit features a Warren (or "double-Warren"/"K-type") truss configuration. The top and bottom chords are made of No. 10 channel steel, while the vertical and diagonal members are fabricated from No. 8 channel steel by welding. The connection module has a length of 3000mm and a height of 1400mm. The chords, diagonals, and the key load-bearing components – the single and double lug connectors on the chords – are made of material Q345B. All main truss members are factory-prepared and connected on-site using Bailey pins.
Bracing System: Comprises wind ties and vertical struts, connected to the floor beams.
Deck System: Consists of floor beams and steel deck panels. The floor beams are made from 28A I-beams, fixed to the Bailey panels using specially designed floor beam clamps. The deck panels directly withstand tracked or wheeled loads. Dimensions: 2996×900×110 (mm) and 2996×540×110 (mm), fixed using U-bolts.
| Advantage | Description |
|---|---|
| Modular Design | Utilizes standardized prefabricated components for flexible combination. |
| Rapid Deployment | Enables quick response and setup in emergency scenarios. |
| High-Efficiency | Significantly shortens construction cycles and enhances efficiency. |
| Relocatability | Entire structure can be disassembled, transported, and reused. |
| Structural Strength | High-strength steel offering exceptional load-bearing capacity. |
Steel truss girder components are shipped as loose items on flatbed trailers or in containers, securely fastened with tensioning belts. Bearings, bolts, drift pins, and tools are packed in sturdy boxes to avoid loss during transport.
