ICF(Insulated Concrete Form) Bracing
AASHTO LRFD Box Girder Steel Bridge | ASTM A709 Steel Fabrication & AWS D1.5 Welding
1. Design & Quality Assurance Standards
Our box girder steel bridges are designed and fabricated in full compliance with globally recognized codes to ensure reliable performance for international infrastructure projects.
- · AWS D1.5 / AWS D1.1 (American Welding Society Bridge Welding Code)
- · ASTM A709 (Standard Specification for Structural Steel for Bridges)
- · JTG/T 3364-2019 (Technical Specification for Highway Steel Box Girder Bridge Design)
2. Span Range & Application Scope
- This type of bridge is designed for an economical main span of 200m to 500m. It is widely used in long-span river and sea crossings, large urban interchanges, elevated highways, and other key transportation infrastructure projects.
3. Structural Configuration & Section Properties
The bridge adopts closed or open box sections, which mainly consist of top slab, bottom slab, webs, longitudinal stiffeners and transverse diaphragms. The closed box structure delivers outstanding torsional performance with much higher rigidity than open-section girders, enabling even load distribution, large section inertia, and an optimized depth-to-span ratio.
4. Key Structural Performance Parameters
With ultra-high torsional stiffness, this box girder bridge is especially suitable for horizontally curved, skewed and geometrically complex bridge alignments. All key dimensions including plate thicknesses, web spacing, stiffener spacing and diaphragm spacing are designed in a modular way to guarantee high fabrication precision and efficient structural behavior.
The primary structural system is continuous span, which can also be designed as rigid frame or simply-supported-to-continuous system according to project needs. It supports both orthotropic steel decks for direct asphalt paving and composite steel-concrete deck systems.
- ✅High load-carrying capacity to accommodate heavy highway and rail traffic
- ✅Low structural depth ideal for urban interchanges and space-constrained sites
- ✅High industrialization level with standardized prefabrication and stable quality
- ✅100% recyclable steel for eco-friendly and sustainable construction
- ✅30–50% lighter than concrete bridges, lowering foundation costs and construction difficulty
- ✅Excellent durability and low long-term maintenance requirements
We use high-quality structural steels to meet different regional and environmental demands. ASTM A709 Gr.50 / Gr.50W is applied for North American and international projects, while Q355 high‑strength structural steel is provided for markets in Asia, Europe and Africa. High-strength weathering steel is also available for coastal, offshore and high-corrosion environments.
8. Packaging & Transportation
All steel components are treated with anti-rust oil and wrapped in waterproof film for effective protection. Segmented parts are securely packed in steel frames or wooden cradles to prevent damage during long-distance sea transportation. The modular structure allows compact loading, efficient container shipping and easy on-site handling.
We offer full customization for span length, bridge width, load grade and overall structural layout. Our design can be adapted to AASHTO LRFD, Eurocode 3, AS 5100 and other regional design codes. Connection details, deck types and accessories can all be customized based on specific project requirements, and segment sizes can be adjusted flexibly for easier transportation and erection.
All segments are prefabricated in a factory-controlled environment with complete welding and anti-corrosion coating processes. On-site erection can be carried out through incremental launching, crane lifting or cantilever assembly. Deck paving and accessory installation are highly efficient, helping to achieve accelerated project delivery.
- 👉2-year warranty provided for structural connections and key components
- 👉Full-lifecycle technical consultation, installation guidance and maintenance support
- 👉Professional engineering team available for on-site instruction when required
- 👉Timely response to all technical inquiries and effective solutions throughout the project
We provide integrated one-stop solutions for box girder steel bridges, covering design, fabrication, packaging, transportation and after-sales support. Every product is manufactured strictly in accordance with international standards to ensure structural safety, long service life and cost efficiency. Contact our professional team today to discuss your project requirements, and we will provide a tailored technical proposal and competitive quotation for your global infrastructure project.
