Customized Prefabricated Box Girder Steel Bridge Aashto Standard Compliant

• Customization: Available
• After-sales Service: 24/7 Technical Support, Installation Guidance
• Warranty: 1 Year
• Model NO.: Box Girder Steel Bridge
• Material Grade: High-Strength Structural Steel Q345b / ASTM A572
• Design Compliance: Fully Compliant with Aashto Lrfd Standards
• Connection Type: Bolted or Welded Field Connections
• Surface Finish: Anti-Corrosion Paint or Hot-DIP Galvanized
• Modular Sections: Prefabricated Segments for Rapid on-Site Assembly
• Load Rating: Hl-93 / HS20-44 or Customized Ratings
• Torsional Stiffness: Superior Due to Closed Box Configuration
• Transport Package: Sea Freight (Container/Bulk Vessel)
• Specification: Customized length, Q235/Q355/ASTM steel
• Trademark: FAMOUS
• Origin: China
• HS Code: 7308900000
• Package Size: 1200.00cm * 200.00cm * 100.00cm
• Package Gross Weight: 2000.000kg
• Lead Time: 180 days (1 - 100 Tons) ; To be negotiated ( > 100 Tons)

Product Description

The Customized Prefabricated Box Girder Steel Bridge is a high-performance structural system engineered for modern highway and infrastructure projects where design flexibility, accelerated construction, and AASHTO compliance are critical. Featuring a closed box cross-section, this bridge type delivers exceptional torsional rigidity, high bending resistance, and superior span-to-depth efficiency compared to open-section alternatives. The fully prefabricated nature allows for factory-controlled quality, reduced on-site labor, and significantly shortened project timelines.

AASHTO Standard Compliance

Our bridges are meticulously engineered to satisfy the requirements of AASHTO LRFD Bridge Design Specifications. This ensures that every structural component – from the top and bottom flanges to the web plates, stiffeners, and diaphragms – meets rigorous safety, durability, and performance criteria. Compliance covers live load analysis (HL-93), fatigue and fracture limit states, strength limit states, and serviceability requirements. We also adapt to state-specific DOT standards and project-level modifications as needed.

Customization Capabilities

We understand that every project site has unique demands. Our customization services cover the full spectrum of bridge parameters:

Span and width: Adjusted to site geometry and traffic demand
Girder dimensions: Depth and plate thicknesses engineered for specific loading
Steel grade selection: Options including Q235B, Q345B, Q355B, ASTM A36, ASTM A572, and higher grades
Alignment: Straight or horizontally curved configurations
Connection method: Bolted for easier assembly or welded for enhanced continuity
Deck system: Designed for composite action with cast-in-place concrete or prefabricated deck panels
Surface protection: Various coating systems to suit environmental conditions (marine, industrial, urban, etc.)

Prefabrication & Quality Control

All sections are factory-fabricated under strict quality management systems. The prefabrication process includes:

• CNC precision cutting of all steel plates with ±0.5mm tolerance
• Robotic submerged arc welding and semi-automatic welding with qualified procedures
• Pre-assembly of complete girder segments on jig beds to verify fit-up
• 100% Non-Destructive Testing (NDT) including Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) on critical weld zones
• Dimensional inspection to ensure shipping and field assembly tolerances are met
This systematic approach guarantees that every segment arrives on-site ready for fast, accurate, and safe installation.

Performance Advantages

Performance Factor	Advantage
Structural Efficiency	High strength-to-weight ratio with optimized plate thickness
Torsional Resistance	Closed box cross-section delivers superior stability under eccentric loads
Durability	Corrosion-protected steel with engineered fatigue life ≥2 million cycles
Seismic Behavior	Ductile design with controlled deformation capacity
Fabrication Precision	CNC cutting and robotic welding ensure consistent quality
Field Assembly Speed	Prefabricated segments reduce on-site work by up to 50%

Applications

This versatile bridge system is suitable for a wide range of project types:

1.Highway overpasses and interchange ramps
2.Railway grade separations
3.Urban flyovers and elevated expressways
4.Pedestrian bridges requiring clean aesthetics and long spans
5.Industrial access roads and heavy haul routes
6.Port and terminal internal road networks
7.Renewable energy projects (wind farm access bridges)
8.Emergency bridge replacement scenarios requiring rapid deployment

Engineering & Design Support

We provide comprehensive technical support from concept to completion. Our in-house engineering team collaborates with clients to:

1.Develop preliminary designs and structural calculations
2.Prepare fabrication drawings and erection plans
3.Perform finite element analysis (FEA) for complex geometries
4.Offer lifting and transportation method statements
5.Provide on-site technical consultation during installation
This integrated approach ensures that your customized bridge is not only compliant but also cost-effective and constructible.

Specification

Category	Details
Design Code	AASHTO LRFD Bridge Design Specifications; optional EN 1993-2 or BS 5400
Steel Material	Q345B / Q355B / ASTM A572 Grade 50; ASTM A36 available for secondary members
Plate Thickness Range	Flanges: 14–40mm; Webs: 12–32mm; Diaphragms: 10–25mm (engineered per project)
Fabrication Tolerances	Cutting: ±0.5mm; Drilling: ±0.3mm; Overall segment length: ±3mm
Welding Standards	AWS D1.1 / ISO 3834; Submerged Arc Welding (SAW) and Flux-Cored Arc Welding (FCAW)
NDT Requirements	100% UT on full-penetration butt welds; MT on fillet welds and connection plates

Packaging & Shipping

1.All bridge components are packed according to international shipping standards to ensure they arrive at the jobsite in pristine condition.
2.Seaworthy packaging with fumigated wooden supports and protective wrapping is provided as standard.
3.For ease of transportation, each box girder is typically segmented into lengths of 12 to 30 meters, depending on shipping mode and site lifting capacity.
4.We offer both containerized shipping for smaller projects and break-bulk or flat-rack shipping for large-scale orders.
5.Each shipment includes complete marking, packing lists, lifting sling arrangements, and assembly sequence drawings to facilitate efficient handling upon arrival.
6.Custom export packaging is available for projects with special logistics constraints.

After Sales Service

We are committed to long-term client satisfaction through our robust after-sales support:

1.24-hour technical hotline for installation and operational queries
2.On-site supervision and installation training available upon request
3.Warranty coverage against material and fabrication defects
4.Regular follow-up to monitor bridge performance
5.Spare parts procurement for maintenance and future repairs
6.Lifetime engineering consultation for inspection schedules and maintenance planning
Our responsive service team ensures that any concerns are addressed promptly and professionally.

Company Profile

We are Hangzhou FAMOUS Steel Engineering Co., Ltd., a professional steel structure manufacturer based in China with extensive experience in designing, fabricating, and supplying customized prefabricated steel bridges for infrastructure projects worldwide. Our ISO 9001:2015 and CE (EN 1090) certified production facilities are equipped with advanced CNC cutting lines, robotic welding systems, and precision assembly bays to ensure consistent quality and on-time delivery. With a monthly fabrication capacity exceeding 3,000 tons and a dedicated team of structural engineers and project managers, we serve government agencies, EPC contractors, consulting firms, and industrial developers across more than 30 countries. We pride ourselves on delivering cost-effective, code-compliant, and constructible bridge solutions tailored to the specific demands of each project, from initial concept through final erection.