Heavy-Duty Steel Box Girder Bridges
1.Product Details
- Superior Torsional Rigidity: The closed-box section provides exceptional resistance to torsional (twisting) forces, making it the ideal choice for curved bridges and structures with heavy eccentric loads.
- Extended Span Capabilities: Engineered to achieve significantly longer spans compared to traditional beam bridges, reducing the number of required support piers and minimizing environmental impact.
- Advanced Automated Welding: All box segments are fabricated using high-precision automated submerged arc welding (SAW), ensuring deep penetration and structural integrity of all critical joints.
- High-Strength Structural Steel: Utilizes premium Q355B, Q390D, or Q420D tensile steel, offering an optimized strength-to-weight ratio for demanding highway and railway infrastructure.
- Aerodynamic & Aesthetic Design: The smooth, clean lines of the box girder not only provide a modern architectural look but also improve wind resistance and simplify long-term maintenance.
- Corrosion Protection Systems: Features Sa2.5 grade sandblasting followed by high-performance multi-layer epoxy or fluorocarbon coatings to ensure durability in humid or coastal environments.
2.Technical Specifications
| Feature | Specification Details |
| Structure Type | Steel Box Girder / Orthotropic Steel Deck |
| Material Grade | Q355B / Q345B / Q420D High-Tensile Steel |
| Main Fabrication | Factory-Prefabricated Segments for On-site Bolting/Welding |
| Design Standard | GB50017 / AASHTO / Eurocode / BS 5400 |
| Span Range | 30m to over 100m (Customizable per project) |
| Inspection Standards | 100% Ultrasonic (UT) & Radiographic (RT) Weld Testing |
| Surface Treatment | Hot-dip Galvanized or Multi-layer Marine Painting |
3.Applications
- Urban Overpasses & Flyovers: Space-efficient designs for complex city traffic interchanges.
- Large-Span River Crossings: Durable bridge structures for crossing wide waterways with minimal piers.
- High-Speed Railway Bridges: Rigid box structures designed to handle high-frequency vibrations and heavy axial loads.
- Highway Viaducts: Rapidly deployable bridge systems for long-distance elevated road networks.
4.Why Choose Shijie Heavy Industry?
At Shijie Heavy Industry, we combine precision engineering with large-scale fabrication capacity. Our design team utilizes Tekla Structures for millimeter-accurate 3D detailing, ensuring that every box segment fits perfectly during on-site assembly. With extensive experience in delivering heavy infrastructure to Africa, Southeast Asia, and the Middle East, we provide comprehensive technical support—from structural optimization and load analysis to global logistics and expert installation guidance.