ICF(Insulated Concrete Form) Bracing
Q345B/Q460C Steel Box Girder Bridge – Certified to ASTM/BS/GB Standards
The Q345B/Q460C Steel Box Girder Bridge is high‑performance bridge structure for highway, railway and urban infrastructure. Made from Q345B / Q460C high‑strength steel and compliant with ASTM, BS 5400, GB/T 714. Closed box‑section features outstanding torsion and bending resistance, well suited for curved routes, long‑span and heavy‑traffic projects. All products are custom‑fabricated to meet global engineering requirements.
Material Grades – Q345B vs Q460C
| Parameter | Q345B | Q460C |
|---|---|---|
| Yield Strength | ≥345 MPa | ≥460 MPa |
| ASTM Equivalent | A572 Gr 50 | A709 Gr 50W |
| EN Equivalent | S355JR | S460 |
| Typical Application | Medium‑span highway bridges | Long‑span / heavy‑load railway & seismic‑zone bridges |
Q345B balances strength, weldability and cost‑efficiency for general highway projects. Q460C provides higher yield strength for long‑span, heavy‑duty bridge construction.
Full International Standard Compliance
Manufactured according to GB/T 714, BS 5400, ASTM A709/A572. Complete mill test certificates EN 10204 3.1/3.2 are supplied, ensuring full material traceability for international project approval.
Manufactured according to GB/T 714, BS 5400, ASTM A709/A572. Complete mill test certificates EN 10204 3.1/3.2 are supplied, ensuring full material traceability for international project approval.
Superior Structural Performance – Why Steel Box Girders?
Steel box girders bring remarkable structural advantages for bridge engineering. The closed‑cell section delivers high torsional stiffness which works perfectly for curved & skewed bridge alignments. It achieves good flexural strength with efficient material consumption and favourable strength‑to‑weight ratio to reduce foundation load. The box‑shaped structure maintains stable performance both during fabrication and service operation, and realizes Grade 8 seismic resistance as well as Grade 12 wind resistance.
Steel box girders bring remarkable structural advantages for bridge engineering. The closed‑cell section delivers high torsional stiffness which works perfectly for curved & skewed bridge alignments. It achieves good flexural strength with efficient material consumption and favourable strength‑to‑weight ratio to reduce foundation load. The box‑shaped structure maintains stable performance both during fabrication and service operation, and realizes Grade 8 seismic resistance as well as Grade 12 wind resistance.
Specification
| Parameter | Details |
|---|---|
| Material Grades | Q345B, Q460C |
| Design Standards | GB/T 714, BS 5400, ASTM A709/A572 |
| Span Length | 10‑300 metres single span, customised |
| Bridge Width | Up to 10 metres, custom width available |
| Plate Thickness | Main plates 12‑30mm; secondary plates 10‑20mm |
| Structure Type | Single‑cell / multi‑cell, straight or curved |
| Field Connection | Bolted or welded site splices |
| Seismic / Wind Resistance | Grade 8 seismic, Grade 12 wind |
| Design Life | 100 years under regular maintenance |
| Certification | ISO 9001:2015, CE marking, CNAS |
Custom Fabrication – Tailored to Your Project
All box girders are custom‑fabricated according to individual project demands. Our engineering team carries out structural calculation by STAAD.Pro, SAP2000, RFEM, completes shop drawings & 3D modelling. Production covers CNC cutting, automatic SAW/GMAW welding, NDT (UT / MT) non‑destructive testing, workshop trial assembly before shipment and various surface treatment options including shot blasting, painting or galvanising. Factory pre‑fabrication minimises on‑site modification and speeds erection.
All box girders are custom‑fabricated according to individual project demands. Our engineering team carries out structural calculation by STAAD.Pro, SAP2000, RFEM, completes shop drawings & 3D modelling. Production covers CNC cutting, automatic SAW/GMAW welding, NDT (UT / MT) non‑destructive testing, workshop trial assembly before shipment and various surface treatment options including shot blasting, painting or galvanising. Factory pre‑fabrication minimises on‑site modification and speeds erection.
Prefabricated & Segmental Construction – Faster Installation
We adopt segmental prefabrication mode. Components are welded into segments inside factory, transported to site and jointed by high‑strength bolt or welding.
We adopt segmental prefabrication mode. Components are welded into segments inside factory, transported to site and jointed by high‑strength bolt or welding.
- • Shorten site construction period
- • Less disturbance to urban traffic
- • Stable factory production quality
- • Lower site labour cost, less weather impact
Quality Assurance & Certification
Strict quality control is implemented with full material traceability.
Strict quality control is implemented with full material traceability.
- • Raw material inspection against mill certificates
- • In‑process dimensional & weld inspection
- • Final inspection before delivery
- • Available certifications: ISO9001, CE, CNAS
- • Optional UT / MT NDT testing
Applications
Suitable for highway bridges, motorway overpasses, railway bridges, viaducts, urban flyovers, elevated roads, pedestrian & cycle bridges, port, industrial and mountain curved bridges.
Suitable for highway bridges, motorway overpasses, railway bridges, viaducts, urban flyovers, elevated roads, pedestrian & cycle bridges, port, industrial and mountain curved bridges.
Packaging & Shipping
Box girder segments are well packed for safe transit. Loaded in 40ft / flat‑rack / open‑top containers or by bulk shipment. Each part is clearly marked for tracking. Custom packaging solution is available to guarantee on‑time worldwide delivery.
Box girder segments are well packed for safe transit. Loaded in 40ft / flat‑rack / open‑top containers or by bulk shipment. Each part is clearly marked for tracking. Custom packaging solution is available to guarantee on‑time worldwide delivery.
After‑Sales Service
We supply complete technical documents including MTC, fabrication drawings and installation guides, offer engineering consultation for load, seismic and foundation design, provide on‑site installation technical guidance, full compliance documents for project acceptance and 24/7 technical support during construction.
We supply complete technical documents including MTC, fabrication drawings and installation guides, offer engineering consultation for load, seismic and foundation design, provide on‑site installation technical guidance, full compliance documents for project acceptance and 24/7 technical support during construction.
Company Profile
Hangzhou FAMOUS Steel Engineering Co., Ltd. (FASECbuildings) from China, is professional steel bridge manufacturer for global infrastructure projects. Our products comply with ASTM, BS 5400, GB/T 714. Supported by experienced engineering team, we provide integrated design, fabrication and project management services. We have exported steel box girder bridges to many countries and earned trust for reliable quality and responsive service.
Hangzhou FAMOUS Steel Engineering Co., Ltd. (FASECbuildings) from China, is professional steel bridge manufacturer for global infrastructure projects. Our products comply with ASTM, BS 5400, GB/T 714. Supported by experienced engineering team, we provide integrated design, fabrication and project management services. We have exported steel box girder bridges to many countries and earned trust for reliable quality and responsive service.
Contact us today to share your bridge requirements including span, width, loading, steel grade and design standards. Our technical team will send you customised design proposal and competitive quotation within 24 hours.
