Steel structure bridge

Steel bridges deliver strength where it matters: long spans, heavy loads and fast, weather-independent construction. Members are fabricated with precision in the shop, shipped as engineered sections and erected quickly on site, giving you a durable crossing with less disruption than cast-in-place alternatives.

Whether the need is a pedestrian crossing, a highway overpass or an industrial pipeline bridge, the same engineering discipline applies: accurate design to your loads and codes, precise fabrication, and an installation plan that keeps disruption to the surrounding traffic and environment as small as possible.

Steel Bridge Applications

Steel bridges serve a wide range of crossings and support roles:

• Pedestrian & Cycle Bridges – clean, lightweight structures for public use.

• Highway & Road Overpasses – durable structures for vehicle traffic.

• Railway Bridges – engineered steel spans for rail loads.

• Pipeline & Conveyor Bridges – support structures for industrial infrastructure.

• Temporary & Emergency Bridges – quick-install crossings for construction or relief work.

• Waterway & Canal Crossings – clean spans that preserve navigation and flow.

Key Features

• Long Span Capability – steel spans reach lengths that concrete often cannot match.

• Lightweight Members – lower foundation and lifting demands than heavy alternatives.

• Precision Fabrication – shop-made sections with trial assembly available.

• Fast Site Erection – sections arrive ready to lift and bolt, minimizing site work.

• Superior Corrosion Protection – heavy-duty coating systems matched to environment.

• Design Flexibility – plate, truss or composite solutions per span and load.

• Low Maintenance – durable materials and coatings extend maintenance intervals.

• Reliable Quality – controlled shop fabrication beats site-cast variability.

Standard Specification Range

Note: final specifications are confirmed against your project drawings and design codes.

Materials & Surface Treatment

Main members use steel plates and rolled sections in Q235B/Q355B, with welding performed to controlled procedures. Protection is matched to environment and service life:

• Heavy-duty epoxy or polyurethane systems for coastal and industrial locations.

• Hot-dip galvanizing for components exposed to moisture and salt.

• Top coats selected for UV stability and long maintenance intervals.

Steel Bridge System Breakdown

Every bridge is a coordinated assembly of load-bearing elements:

• Main Girders – plate girders or trusses carry the primary loads.

• Deck System – steel plate or composite decks distribute traffic loads.

• Cross Frames – transverse members stabilize the girders.

• Bearings & Joints – allow movement and transfer loads to supports.

• Safety Elements – parapets, handrails and surfacing complete the crossing.

Frequently Asked Questions About Steel Bridges

1. What spans can steel bridges achieve?

Span capability depends on the bridge type and loading. Our engineers design the structure to your specific span and load requirements.

2. How is corrosion protection handled?

Heavy-duty anti-corrosion coating systems are applied, with options matched to your environment and expected service life.

3. How are prefabricated sections installed?

Sections are fabricated in the shop, transported to site and erected with cranes following the installation plan and guidance.

4. Can the bridge be designed to local codes?

Yes. Design loads and standards follow your project's local codes and specification.

5. How long does a steel bridge take to build?

Shop fabrication runs in parallel with foundation work on site, so overall schedules are typically much shorter than cast-in-place bridges.

6. Can the bridge support heavy vehicles?

Yes. Bridge type and members are designed around your vehicle loads and traffic class.

7. What maintenance does a steel bridge need?

With the correct coating system, maintenance is limited to periodic inspection and touch-up, depending on environment.

8. Can temporary bridges be reused?

Yes. Modular steel bridges can be dismantled, transported and re-erected at new sites.

9. Can I get a custom design?

Absolutely. Send your crossing requirements and site details for a custom design and quotation.

10. How is the price calculated?

Price depends on span, width, deck system and surface treatment. Share your requirements for a detailed quotation.

11. Can you provide project references?

We are happy to share relevant project experience on request, and arrange factory tours or video calls so you can review our production lines, quality control and finished projects before you decide.

12. How do we start our project?

Simply send your requirements through the contact form or email. Our engineers will confirm the details and respond with a quotation as soon as your requirements are confirmed.

Start Your Bridge Project in Three Steps

1. Send Your Requirements – share your span, width, load requirements or site details through the contact form or email; our engineers confirm the key parameters with you.

2. Review Design & Quotation – we prepare the structural design and itemized quotation; you review, adjust and confirm the order.

3. Fabrication & Delivery – production starts after confirmation; your bridge is fabricated, inspected, packed and delivered on schedule with erection support.

Why Choose Steel for Your Bridge

For crossings, steel offers a combination no other material matches: long spans, light weight and factory-controlled quality. A steel bridge can be fabricated in parallel with site foundations, then delivered as engineered sections and erected quickly – which keeps disruption to traffic, rivers or sensitive environments to a minimum. Where a cast-in-place alternative might close a road or a waterway for months, a prefabricated steel bridge can often be installed in weeks.

The structural advantages are just as important. Steel's high strength-to-weight ratio allows spans that concrete struggles to reach economically, and the lighter structure reduces demands on foundations and temporary works. Precision shop fabrication, with trial assembly where required, means the members fit together on site exactly as designed, removing the variability of site-cast concrete.

Long-term performance is protected by heavy-duty coating systems matched to the environment – whether coastal salt, industrial atmosphere or inland climate. With periodic inspection and routine touch-up, a steel bridge serves reliably for decades, and its recyclability adds a sustainability advantage at end of life.

Typical Bridge Configurations & Layout Options

Every crossing is designed to its site, but most projects follow proven forms:

• Plate Girder Bridge – the workhorse form for road and pedestrian spans, economical and quick to erect.

• Truss Bridge – efficient for longer spans where weight and wind matter.

• Composite Steel-Concrete Deck – steel girders with a concrete deck working together for stiffness.

• Pedestrian Footbridge – light, elegant structures with parapets and non-slip decking.

• Temporary / Relocatable Bridge – modular spans that can be dismantled and re-erected at new sites.

Packaging, Shipping & After-Sales

We treat logistics as part of engineering, not an afterthought:

• Engineered Packing – sections are protected and labeled for lifting sequence and position.

• Project Shipping – transport plans account for section weight, length and route constraints.

• Installation Guidance – erection plans and lifting guidance accompany delivery; supervision teams available.

• After-Sales Support – maintenance guidance, spare parts and warranty terms as specified in the contract.

• Documentation – material certificates, weld records and inspection reports provided with delivery.

Project Timeline: From Order to Handover

From enquiry to handover, every project follows a controlled process:

1. Requirement & Design – confirm spans, loads and codes; issue structural drawings.

2. Fabrication – precision cutting, welding and trial assembly in our workshop.

3. Quality Inspection – dimensional and welding checks with test certificates.

4. Packaging & Shipping – protected sections packed for efficient transport.

5. On-Site Erection – guided lifting and assembly; optional supervision team.

Quality Assurance & Why Choose Derun

Bridge steel is inspected at every stage – material certificates, weld quality and final dimensions – before dispatch. Our EPC approach keeps design and construction coordinated, which is critical for structures built to public codes.

• One-Stop EPC – design, fabrication, installation and after-sales from a single supplier.

• In-House Production – 2,000+ tons monthly capacity across two intelligent production lines.

• Engineered Quality – precision fabrication with dimensional and welding inspections.

• Export Experience – packaging and documentation prepared for international projects.

• Responsive Service – a dedicated project contact from enquiry to handover.

Design & Engineering Process

Every steel bridge starts with the crossing itself, not a template. Our engineers take your span, width, load requirements and site conditions and confirm the key parameters – bridge type, deck system, design loads and the local design codes that apply. That confirmation becomes the basis of the structural design, so the bridge suits its crossing from the very beginning.

The design then moves into detailed engineering: girder or truss sizing, connection design, bearing and joint selection and fabrication drawings, all produced to a controlled standard. Because design and fabrication live in the same organization, every detail is checked against our production capability – welding procedures, trial assembly and coating details are resolved before steel is ordered, not discovered on site.

Finally, production begins: steel is cut, drilled and welded with controlled procedures, inspected, and where required trial-assembled, then coated and packed. The result is a bridge that arrives on site as engineered sections, ready to be lifted and bolted exactly as designed.

Performance, Durability & Maintenance

A steel bridge is designed for decades of reliable service with a clear maintenance program. Heavy-duty coating systems protect against corrosion, and routine inspection keeps the structure in top condition over its full life.

• Expected Service Life – engineered for long-term use with proper maintenance.

• Corrosion Control – coating systems matched to coastal, industrial or inland environments.

• Inspectable Structure – accessible members simplify periodic checks.

• Replaceable Parts – bearings, joints and coatings can be renewed without rebuilding.

• Sustainable Material – steel is recyclable and fabrication minimizes site waste.

Understanding Your Cost & Quotation

Every bridge is quoted individually because every crossing is different. Your quotation is built from the parameters that actually drive cost, so you can compare options and adjust the design to fit your budget.

• Span & Width – the fundamental parameters of the crossing.

• Bridge Type – plate girder, truss or composite design.

• Deck System – steel plate, orthotropic or composite deck.

• Design Loads – pedestrian, vehicle or rail loading requirements.

• Surface Treatment – coating systems matched to the environment.

• Shipping & Erection Scope – transport, lifting and site services.

Send your span, width, load requirements and site details, and our engineers will respond with an itemized quotation as soon as your requirements are confirmed.

Related Steel Structure Solutions

Bridges are often part of a wider steel infrastructure project. Explore the related solutions we design and fabricate:

• Multi-Storey Parking Garage – access and parking structures for transport hubs.

• Steel Structure Warehouse – logistics buildings around the crossing.

• Multi-Functional Exhibition Hall – public buildings for the surrounding area.

• Agricultural Greenhouse – agricultural structures for rural sites.

Installation Services & On-Site Support

How your bridge gets erected is your choice, and we offer three levels of support. The most common is guidance-only: our erection drawings and lifting plans travel with the steel, and your local crew lifts and bolts the sections together under our remote support. For teams with less experience, we can provide a supervisor who leads the erection on site and trains your workers section by section.

For clients who prefer a complete package, our installation team can manage the full erection. Either way, the process is planned in advance: foundations and bearings are prepared to our drawings, sections are delivered in lifting order, and each member is aligned and connected according to the sequence that keeps the structure stable at every stage.

Quality and safety are built into the process. We provide tightening specifications, inspection checklists and lifting safety guidance, and every shipment is documented so site teams can verify each section against the drawings. Whatever level of support you choose, the goal is the same: a bridge erected correctly, safely and on schedule.

• Guidance-Only – drawings, lifting plans and remote technical support.

• Supervision – an experienced supervisor leads and trains your crew.

• Full Installation – our team erects the complete structure.

• After-Sales – maintenance guidance, spare parts and warranty support.

Questions to Ask Before You Order

A few minutes spent confirming these points before ordering saves time and cost later. Our engineers will guide you through each one:

• Codes & Loads – which local design codes and load classes apply to the crossing?

• Site Conditions – what soil, waterway or traffic constraints affect the design?

• Access & Lifting – can cranes and delivery vehicles reach the erection position?

• Environment – what corrosion exposure will the bridge face?

• Schedule – what is the target completion date for foundations and erection?

Get a Quote

Ready to start your bridge project? Send your span, width, load requirements and location, and we will respond with a detailed quotation as soon as your requirements are confirmed.