ICF(Insulated Concrete Form) Bracing
Superior Spanning Capability & Ultimate Load Capacity: High-Performance Steel Box Girder Bridge
Steel Box Girder Bridge is a closed thin-walled steel structure with hollow box section, recognized globally as the preferred solution for modern long-span and urban elevated bridge engineering. Featuring exceptional torsional stiffness, low dead load, outstanding structural stability and elegant streamline appearance, it outperforms conventional plate girder bridges in complex curve alignment, heavy traffic load and harsh natural environment.
As a core form of Prefab Steel Structures and Steel Structure Building system, our steel box girder bridge is fully factory fabricated, greatly minimizing on-site cast-in-place work. It is widely adopted in highway viaducts, municipal interchanges, sea-crossing river-spanning bridges and railway overpass projects, delivering longer service life, lower foundation investment and faster construction progress.
Steel Box Girder Bridge Main Types
1. Single-Cell Steel Box Girder Bridge
Single box single cell structure, simple layout and streamlined fabrication. Small wind resistance, convenient transportation and hoisting; ideal for medium-span municipal overpasses, landscape bridges and urban branch road reconstruction projects.
2. Multi-Cell Steel Box Girder Bridge
Single box double cell or multi-box combined structure, higher overall lateral rigidity and load-bearing capacity. Perfect for multi-lane highway main lines, urban elevated trunk roads and heavy traffic viaduct engineering.
3. Curved Steel Box Girder Bridge
Custom curved alignment design, excellent torsion resistance to adapt to urban curve road planning. Smooth appearance and stable force performance, the mainstream choice for urban interchange loop ramp bridges.
4. Variable Cross-Section Steel Box Girder Bridge
Height and width variable along the bridge span, optimizing mechanical distribution at piers and mid-span. Suitable for super long-span river-crossing bridges and key national infrastructure landmark projects.
Design Standards & Specification Compliance
Our steel box girder bridges are engineered and fabricated to meet mainstream global bridge engineering codes for international project acceptance:
- ● AASHTO LRFD 2020 (American Association of State Highway and Transportation Officials Load and Resistance Factor Design Bridge Design Specification 2020), compliant with HL-93 vehicle load design
- ● AS 5100 (Australian Bridge Design Standard) for Australian and Oceania infrastructure projects
- ● EN 1993 Eurocode 3 (European Standard for Design of Steel Structures), with EN 1090 and ISO 3834 certification
- ● Raw steel follows ASTM A709 (Standard Specification for Structural Steel for Bridges)
- ● Welding works comply with AWS D1.1 (American Welding Society Structural Welding Code)
- ● Refer to AISI (American Iron and Steel Institute) for structural design and material application
Technical Parameters & Material Grades
| Item | Standard Configuration | Customizable Range |
|---|---|---|
| Applicable Steel Grade | ASTM A709 Gr.36/Gr.50/Gr.50W, Q345qD, Q370qD | European S355JR / S460JR, customized per project standard |
| Design Span | 30m – 180m | Up to 250m super long-span customized design |
| Steel Plate Thickness | Web: 10–20mm; Flange: 16–60mm | Adjusted by span, load and seismic requirement |
| Section Form | Single-cell / Multi-cell / Curved / Variable section | Custom drawing fabrication available |
| Surface Preparation | Sa2.5 Industrial Sandblasting | Manual rust removal acceptable for special delivery |
| Anti-Corrosion System | Epoxy zinc-rich primer + Epoxy micaceous iron intermediate + Polyurethane topcoat | Hot-dip galvanizing, thermal zinc/aluminum spraying, marine heavy-duty coating |
| Design Service Life | 50 Years | Extended to 75 years via upgraded anti-corrosion scheme |
| Fabrication Mode | Full factory prefabrication + Integral pre-assembly | Modular segmented fabrication for convenient shipping |
Manufacturing Craft & Quality Control
As a professional China Steel Bridge Factory and reliable China Steel Bridge Supplier, we own complete production lines supported by High Speed Work Rolls, CNC cutting machines, automatic submerged arc welding equipment and large shot blasting workshops.
👉Production Flow
Engineering drawing deepening → CNC precise plate cutting → Plate forming and calibration → Unit component assembly → Integral welding → Factory full-scale pre-assembly → NDT non-destructive testing → Sandblasting & anti-corrosion coating → Seaworthy packaging & shipment.
👉Strict Quality Inspection
- Complete Mill Test Certificate (MTC) provided for every batch of raw steel
- All welding seams adopt UT Ultrasonic Testing, RT Radiographic Testing non-destructive inspection
- Dimensional tolerance full check after pre-assembly to ensure 100% on-site installation matching
- Support third-party inspection by SGS, BV, TÜV to satisfy international project supervision standard
Professional Anti-Corrosion System Solution
Aiming at inland atmospheric, urban industrial, coastal salt spray and marine harsh environments, we provide tailored long-term anti-corrosion protection for steel box girder bridge:
- ● Standard urban type: Three-layer paint coating system for ordinary municipal and highway bridges
- ● Coastal heavy-duty type: Thickened epoxy coating + salt-resistant topcoat, adapting to high humidity and salt spray corrosion
- ● Permanent maintenance-free type: Hot-dip galvanizing composite coating, greatly reducing later maintenance cost
- ● Special environment: Thermal zinc-aluminum spraying + closed finish, applied to sea-crossing and offshore bridge engineering
Application Scope
-
✅Highway long-span viaducts and main line river-crossing bridges - ✅Urban municipal interchange, ramp curved bridge and elevated corridor
- ✅Sea-crossing bridge, bay bridge and coastal port connection bridge
- ✅Railway overpass, high-speed railway auxiliary spanning structure
- ✅Old bridge reconstruction, deck replacement and structural upgrading project
- ✅Industrial park, logistics hub and municipal landscape signature bridge
Core Competitive Advantages
-
✅Global Standard Compatibility: Profound experience in AASHTO, AS5100, Eurocode project implementation, familiar with international bridge load and seismic design requirements - ✅Superior Structural Performance: Closed box section with strong torsion resistance, adaptable to curve, slope and complex terrain layout
- ✅Modular Prefabrication: Adopt Prefabricated Steel Building concept, factory mass production shortens on-site construction period greatly
- ✅Integrated One-Stop Service: From conceptual design, structural calculation, fabrication, pre-assembly to logistics and installation guidance
- ✅Cost-Effective Factory Supply: Direct manufacturer output without middleman, offering transparent China Steel Bridge Quotes for global contractors
-
✅Rich Oversea Project Experience: Familiar with export document procedure and Incoterms 2020, delivering qualified products to worldwide construction sites
Full-Lifecycle Service Support
👉Pre-Sales Technical Service
Free scheme consultation, bridge type selection and load standard matching; professional drawing review and customized solution design.
👉In-Sales Production Service
Real-time production progress tracking, standard seaworthy packaging; full export document arrangement and global logistics arrangement.
👉After-Sales Technical Support
Installation manual and video guidance provided; remote technical consultation and optional on-site engineer installation guidance.
Get Your Custom Steel Box Girder Bridge Solution
Every bridge project has unique geological condition, design standard and construction environment. Whether you are international engineering contractor, government infrastructure department or investment developer, our professional engineering team can customize standard-compliant, durable and cost-effective steel box girder bridge solutions matching your project demands.
🤝Build stable, aesthetic and long-span bridge infrastructure with professional Galvanized Steel Bridge and Steel Frames fabrication.
✉️Contact our technical sales team today to obtain professional design proposal, detailed technical data and competitive factory quotation.
