Prefabricated Steel Structure Bridges — Built in a Factory, Launched in Days
A bridge is not just a path across a gap. It is a structural system that must carry dynamic loads, resist fatigue over millions of cycles, and survive floods, earthquakes and vehicle impacts. We fabricate steel bridges in our factory — to millimeter tolerance — and ship them to site in pre-assembled segments that are launched into position in days, not months.
Factory Precision for the Most Demanding Structure Type
Most steel bridge fabricators work to the same standard: fabricate, weld, ship, hope it fits on site. The problem is that bridge connections — particularly field splices between segments — require tolerance control that hand fabrication cannot achieve. When a 30-ton girder segment arrives on site and the bolt holes do not align, the only options are thermal cutting (which damages the heat-affected zone) or reaming (which oversizes the holes and reduces bearing capacity).
Our CAD-CAM production line solves this at the source. The structural design model — the same one the engineer analyzed — is exported directly to our CNC drilling and cutting machines. Every bolt hole in every flange is drilled to the exact coordinates from the model. When two segments meet on site, the bolts go in without a sledgehammer. This is not a convenience. It is a structural requirement — properly fitted connections distribute load as designed; poorly fitted ones do not.
What We Design and Fabricate
Steel Truss Bridges
Through-truss and deck-truss configurations for highway and railway bridges. Pratt, Warren and K-truss geometries. Shop-fabricated truss panels bolted together on site. Ideal for spans of 40-150m where a clear navigation channel or valley crossing is required.
- Span range: 30-150m (single span)
- Load: HL-93 (highway), ZK load (railway)
- Deck: RC slab on steel cross-beams or orthotropic steel deck
Steel Box Girder Bridges
Single or multi-cell steel box girders for highway flyovers, interchanges and long-span viaducts. Fabricated in segments, transported and launched using incremental launching or balanced cantilever methods. Streamlined aerodynamic sections for long spans.
- Span range: 40-200m (continuous)
- Section: single/multi-cell box
- Launch: incremental / cantilever
Pedestrian & Landscape Bridges
Steel arch bridges, cable-stayed pedestrian bridges and curved steel walkways for parks, urban developments and river crossings. Architectural design freedom — steel can be curved, tapered and finished to create bridges that are civic landmarks, not just crossings.
- Span: 20-100m
- Types: arch, cable-stayed, girder
- Finish: stainless, painted, weathering steel
Railway Steel Bridges
Heavy-duty steel bridges for rail corridors, designed for high dynamic loads, fatigue from millions of train passages, and the strict deflection limits that railway engineering demands. Shop-fabricated to the tightest tolerances in bridge work.
- Load: ZK / LR-100 railway loading
- Deflection: L/800 (passenger rail)
- Fatigue: BS EN 1993-2 / GB 50017
What Makes a Steel Bridge Different from a Steel Building
A building carries static loads — gravity, wind, seismic. A bridge carries dynamic loads: trucks hitting expansion joints, trains braking, wind on a exposed deck, thermal expansion over 200 meters. Bridge engineering is a different discipline.
Dynamic Load Management
Bridge members are designed for fatigue — the cumulative damage from millions of load cycles. Our connection details are engineered to minimize stress concentration, and our weld profiles are ground smooth at fatigue-critical locations to remove notch effects.
Thermal Expansion
A 200m steel bridge grows 200mm when the temperature rises 50C. Our expansion joints and bearing systems accommodate this movement while maintaining structural continuity and deck smoothness. Get this wrong and the bridge tears itself apart.
Corrosion Protection
Bridges are exposed to weather, salt spray and deicing chemicals 24/7 for 50-100 years. Our coating systems — thermal-sprayed zinc, multi-coat epoxy/PU, or weathering steel — are specified for the environment and verified by dry film thickness measurement.
Fatigue-Rated Welding
Bridge welds are not ordinary structural welds. They must meet fatigue category requirements — the weld profile, the toe radius, the absence of defects at the weld toe — all verified by NDT and visual inspection per bridge-specific codes.
Need a Steel Bridge?
Send us your span, loading standard, deck width and site conditions. Our bridge engineering team will provide a system recommendation, fabrication plan and quotation within 24 hours.
Request Bridge Quote