Prefabricated Steel Truss Bridge Fabrication for Highway and Industrial Projects
Xinguangzheng fabricates prefabricated steel truss bridges and plate girder bridges for permanent highway, mining haul road and industrial access projects, with structural design support, shop drawings, factory trial assembly, corrosion protection and EPC-grade quality documentation.
- Structural design support under AASHTO, Eurocode or JTG standards
- Factory trial assembly for permanent steel truss bridge shipments
- HDG and coating systems for coastal, tropical and industrial environments
- Quality documentation including ITP, TPI, MRB, NDT and mill certificates
What Permanent Steel Bridge Procurement Requires Beyond Standard Structural Steel Supply
Permanent road bridge procurement is not the same as ordering standard structural steel. A bridge must be designed and fabricated to a specified load class and governing standard, factory trial-assembled before shipment to verify dimensional tolerance, and delivered with a quality documentation package that satisfies EPC audits, lender reviews and infrastructure asset handover requirements.
| Requirement | Why It Matters |
|---|---|
| Governing design code | Determines calculation method, material grade, connection design and drawing format — AASHTO, Eurocode EN 1993-2 or JTG D60 produce different structural outputs |
| Load class | Drives member sizing and connection design; a bridge under-designed for its actual traffic load is a structural liability regardless of material quality |
| Span and deck width | Defines the bridge configuration, number of main girders or trusses, and the complete fabrication scope |
| Fatigue and dynamic loading | Separates bridge design from static building structures; vehicle-induced dynamic loads require specific fatigue checks not required for standard steel buildings |
| Factory trial assembly | Verifies dimensional tolerance and member fit-up before export shipment; critical for permanent truss bridges where site correction of misalignment is costly |
| Quality documentation | Supports EPC contractor audit, infrastructure lender review and asset handover; typically includes ITP, TPI, NDT, WPS, PQR, trial assembly report and MRB |
Bridge Types, Span Range and Delivery Scope: What Xinguangzheng Fabricates and Supplies
Xinguangzheng fabricates permanent prefabricated steel bridge structures for highway, mining and industrial access projects. The table below outlines the bridge types available, typical span ranges and the best-fit project types for each configuration.
Bridge Types and Span Range
| Bridge Type | Typical Span | Best For | Notes |
|---|---|---|---|
| Steel Truss Bridge | 30m – 200m | River crossings, ravines, mining haul roads, industrial access roads | Main product line; Warren, Pratt and modified configurations available |
| Steel Plate Girder Bridge | 15m – 80m | Shorter spans, simpler fabrication, reduced structural depth | Suitable for many road access and industrial overpass projects |
| Prefabricated Pedestrian Bridge | Project-specific | Urban crossings and industrial park walkways | Secondary product line; confirm span and load requirements at inquiry |
Steel Bridge Fabrication Scope and Exclusions
| Scope Item | Included? | Notes |
|---|---|---|
| Shop-fabricated steel members | ✓ Yes | Component-numbered for site erection sequence |
| Structural drawings | ✓ Yes | Based on confirmed design standard and load class |
| Shop drawings | ✓ Yes | Used for fabrication, inspection and site erection guidance |
| Factory trial assembly | ✓ Yes | Mandatory for permanent steel truss bridge shipments |
| Corrosion protection | ✓ Yes | HDG or coating system based on site environment and design life |
| Mill certificates | ✓ Yes | Part of standard quality documentation package |
| Weld inspection and NDT reports | ✓ Yes | Issued per approved ITP and applicable welding standard |
| Export packing | ✓ Yes | Component-numbered packing lists for shipment and site logistics |
| Abutment and pier design | ✕ Excluded | Buyer or civil engineer scope; substructure design not included |
| Civil foundation and concrete works | ✕ Excluded | Buyer or local contractor scope |
| Field installation labor | ✕ Excluded | Optional engineer guidance can be quoted separately on request |
| Bailey bridge / temporary modular bridge | ✕ Excluded | This service covers permanent bridges only; temporary bridging should be scoped separately |
Three Assumptions That Create Procurement Problems on International Bridge Projects
From our experience fabricating steel bridges for EPC contractors and road project owners across 130+ countries, three recurring assumptions consistently create problems at the engineering review, trial assembly or site erection stage.
Load Class Must Come from the Project Specification
The governing load class — whether AASHTO HL-93, Eurocode Load Model 1 or JTG D60 vehicle loading — must be specified in the project brief, not selected by the fabricator. A bridge designed to an incorrect load class will fail the independent design review and require full re-engineering before fabrication can begin.
Factory Trial Assembly Is Not Optional for Permanent Truss Bridges
Factory trial assembly verifies dimensional tolerance and member fit-up before the bridge leaves the fabrication facility. For remote project sites — mining access roads, river crossings in tropical regions — correcting a misaligned connection on site costs significantly more than the trial assembly itself.
Coastal Bridge Structures Need Correct Corrosion Protection
A permanent bridge with a 50–100 year design life in a coastal or tropical environment cannot be specified with an inland C2–C3 coating system. Under-specifying the protection system results in accelerated corrosion, unplanned maintenance access on a live bridge structure, and significant total life-cycle cost increase.
Design Standard Selection and the Technical Parameters Required to Begin Engineering
Before structural modeling can begin, Xinguangzheng requires a confirmed design standard and a minimum set of technical inputs from the project specification.
American Standard
Applied to highway bridge projects in the US, Canada and projects sponsored by US-based EPC contractors or development banks. Load combinations, fatigue checks and material specifications follow AASHTO LRFD Bridge Design Specifications.
European Standard
Required for EU-funded projects and projects specified by European EPC contractors or lenders. EN 1993-2 covers steel bridge design, with traffic loading per EN 1991-2. EN 1090 CE marking applies when specified in the purchase order.
Chinese National Standard
Applicable to projects in China and infrastructure projects under Chinese EPC frameworks in Africa, Southeast Asia and Central Asia. Q345B (equivalent to S355JR / ASTM A572 Gr.50) is standard for primary bridge structural members.
| Required Technical Input | Why It Matters for Fabrication |
|---|---|
| Governing design standard and load class | Determines calculation methodology, member sizing, connection design and drawing format |
| Span length and number of spans | Defines the bridge configuration, truss height and complete fabrication scope |
| Deck width and lane configuration | Affects live load distribution, number of main girders or trusses, and deck beam spacing |
| Vertical clearance requirement | Impacts bridge geometry, truss depth selection and support conditions |
| Design wind speed (m/s) | Required for lateral load calculation; critical for long-span bridges in exposed locations |
| Seismic zone classification | Required for earthquake-prone regions including Indonesia, Philippines and parts of Africa |
| Site corrosion environment | Determines HDG or coating system; affects lead time and cost |
| Documentation requirements | Defines ITP scope, TPI involvement, EN 1090 execution class and MRB compilation requirements |
Corrosion Protection for Tropical, Coastal and Industrial Environments
A permanent steel bridge with a design life of 50–100 years requires a corrosion protection system matched to its actual site environment. The ISO 12944 corrosion category for the project location — not budget constraints — should determine whether the bridge structure receives a standard coating system, hot-dip galvanizing or an enhanced system for marine-adjacent or tropical conditions.
At Xinguangzheng, from our experience delivering steel structures to 130+ countries, we have seen bridge projects in tropical and coastal environments where the protection specification was reduced during procurement negotiations. For a permanent bridge structure that cannot be easily taken out of service for maintenance, the long-term cost of under-specifying the corrosion protection significantly exceeds the initial saving.
| Site Environment | ISO Class | Recommended Protection | Notes |
|---|---|---|---|
| Inland / low pollution | C2–C3 | Three-coat system: zinc-rich epoxy primer + epoxy intermediate + polyurethane topcoat | Standard for inland highway and industrial access bridges |
| Coastal / heavy industrial | C4 | Hot-dip galvanizing as base layer, or enhanced coating system with high-build epoxy | HDG adds 3–4 weeks to lead time; confirm member dimensions at inquiry stage |
| Marine-adjacent, offshore-influenced | C5-I / C5-M | HDG plus sealing or anti-corrosion topcoat; or thermal spray zinc for primary structural members | Confirm during engineering phase; coating system must match bridge design life |
| Tropical inland (high humidity) | C3–C4 | Enhanced coating system with humidity-resistant primer and topcoat; HDG where budget permits | Tropical environments accelerate corrosion on standard C2 coating systems |
| Oversized members | Any | Coating system review based on member geometry and dipping bath capacity | Very long chord members may exceed standard HDG bath dimensions |
Hot-dip galvanizing adds typically 3–4 weeks to the fabrication schedule and has member geometry constraints. For bridges with long chord members or oversized connection plates, confirm the corrosion specification and member dimensions early in the inquiry stage so we can propose the appropriate protection system without affecting the delivery schedule. Technical parameters are approximate ranges based on project data.
Certification, Quality Documentation and Supplier Pre-Qualification Requirements
Permanent bridge procurement for EPC and infrastructure projects typically requires a defined quality documentation package spanning the full fabrication process — from material sourcing through factory trial assembly and final inspection.
| Document | Purpose |
|---|---|
| Mill certificates (MTC) | Material traceability — confirms steel grade, mechanical properties and chemical composition traceable to heat number |
| WPS / PQR records | Welding procedure specification and procedure qualification records — verifies welding procedures are qualified for the joint types used |
| Welder qualification certificates | Confirms welding personnel are qualified for the applicable welding process and position |
| NDT reports | Non-destructive examination results for bridge welds — UT, MT or PT depending on joint category and applicable standard |
| Dimensional inspection sheets | Fabrication tolerance records for primary structural members, connection geometry and trial assembly measurements |
| Factory trial assembly report | Documents member fit-up, alignment verification and any dimensional corrections completed before export |
| Coating DFT logs | Dry film thickness records for each coating layer; or HDG inspection records per ISO 1461 where galvanizing is specified |
| Component-numbered packing list | Correlates each fabricated member to a unique mark number, drawing reference and shipping bundle — supports site erection sequencing |
| Inspection and Test Plan (ITP) | Defines hold points, witness points and review stages for the fabrication process; agreed with buyer before fabrication begins |
| Manufacturer's Record Book (MRB) | Consolidated quality documentation package for asset handover, lender review or EPC project closeout — available when specified in the purchase order |
Steel Bridge Fabrication Capability Since 1997
Xinguangzheng Steel Structure Group has been fabricating industrial and infrastructure steel structures since 1997. Our 4 manufacturing bases across 150,000 m² of production area include dedicated H-beam welding lines producing 50,000 tonnes per year, supporting the heavy member requirements of permanent truss bridge and plate girder bridge projects.
Our 40+ design engineers work to AASHTO LRFD, Eurocode EN 1993-2 and JTG D60. Our 21-member QC team — with up to 30 years of fabrication experience — manages material traceability, weld inspection, NDT, trial assembly verification and quality documentation for every project. As a New OTC-listed manufacturer (stock code 834422), our documentation and financial traceability meet EPC pre-qualification requirements.
Submit Your Bridge Project Requirements
Share your span length, design standard, load class, site environment and documentation requirements. Our engineering team will review your project parameters and respond with a fabrication scope and preliminary lead time.
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