Prefabricated Bolted Steel Plate Girder Bridge per AASHTO Heavy Haul Rail

A steel plate girder bridge is a type of bridge in which steel plates are welded or bolted together to form an I-shaped cross section as the main load-bearing structure. It features a low structural height, mature manufacturing process, clear force distribution, and fast construction speed, making it one of the most widely used structures in modern highways, railways, and urban three-dimensional transportation systems.

1.Application Scenarios

2.Product Highlights

✔High Strength and Lightweight, Large Span Capability: Compared with concrete beams of the same span, the weight is reduced by about 40%-60%, effectively lowering the cost of substructures (piers and foundations).

✔Factory Prefabrication, Fast On-Site Assembly: Uses automated welding robot production lines, with standardized components; on-site only requires high-strength bolt connections or minimal welding, which can shorten the construction period by more than 50% and reduce traffic disruption.

✔Good Ductility, Excellent Seismic Performance: Steel has excellent elastic-plastic deformation capacity, absorbing energy through yielding under strong earthquakes, making brittle collapse unlikely.

✔Low Beam Height, Low Building Clearance: While meeting structural requirements, the height of steel beams is usually 1/20 to 1/25 of the span, which can effectively reduce the bridge deck elevation, saving on approach length and earthwork.

✔Green and Environmentally Friendly, Recyclable: After dismantling, steel structures can achieve a scrap steel recovery rate of over 90%, aligning with the sustainable development concept under the "dual carbon" goals.

3.Product Materials

4.Customized Services

We offer a full range of personalized customization from design to delivery:
👉Span and Alignment Customization:

Supports straight bridges, curved bridges (minimum turning radius R≥50m), and skew bridges (angle 0°-45°).

Single-span length can be freely adjusted within the range of 10m - 60m according to on-site terrain.

👉Section Optimization Design:

Based on load verification results, we provide variable-height beams (fish-belly type) or constant-height beams.

Customizable open-type (for inspection) or closed-box combinations.

👉Surface Treatment and Color:

Corrosion protection levels can be customized: C3 (ordinary rural), C4 (urban industrial), C5-I (high humidity coastal), C5-M (high salinity industrial).

Topcoat color supports the full range of the RAL color chart (e.g., traffic green, building gray, warning orange).

⭐The advantage of the web plate height-to-thickness ratio is significant:By utilizing thin web plates combined with longitudinal and transverse stiffening ribs, the height-to-thickness ratio can reach over 250, resulting in a 60% reduction in the self-weight of the web plate compared to concrete beams, with an extremely high material utilization rate.

⭐The double I-beam combination exhibits excellent lateral performance:By installing transverse tie beams or diaphragms to integrate the two web plates, the lateral stability is significantly improved, making it suitable for highway bridges with wider decks.

⭐Optimize material distribution for variable height beams:The web height at the fulcrum is increased to 1.8–2.2 times that of the mid-span, and steel is concentrated in areas with larger bending moments, resulting in a 10%–20% reduction in steel usage compared to the equal-height design.

⭐Flexible on-site splicing methods:The flange can be connected using full penetration welding or high-strength bolt friction-type connections, while the web is connected using high-strength bolts, eliminating the need for on-site welding operations.

⭐Collaborative stress with concrete bridge deck:Set up weld stud connectors to form composite beams with cast-in-place concrete bridge decks, allowing the concrete in the compression zone to participate in the stress, thereby increasing the bearing capacity by 30%–50%.

⭐The manufacturing process is mature and efficient:The flange and web are welded using submerged arc welding (SAW), ensuring stable weld quality; the web can have longitudinal seams from panel splicing, and the steel plate size is not limited by the rolling width.

⭐Economic span advantage:The economical span of steel plate girder bridges ranges from 20 to 50 meters, within which their overall cost is 15% to 25% lower than that of steel box girders, making them the most cost-competitive form of steel bridges.

6.Global Standard

7.Company Guarantees

Warranty System:

Implement ISO 9001:2025 quality management system.

100% weld ultrasonic testing (UT) + radiographic testing (RT) on key locations.

Provide structural warranty for a design service life of 50-100 years.

Production and Delivery:

Own modern processing base with a monthly production capacity of up to 2,000 tons.

Provide a "blue-light 3D scanning" pre-assembly report to ensure the bolt hole alignment error on-site ≤ 2mm.

Nationwide logistics transportation and on-site lifting technical guidance, including remote mountainous areas.

📧Satisfied after reading? Feel free to contact us, we look forward to working with you!🤝