ASTM A588 Weathering Corten Steel Plate Truss Bridge for River & Canal Crossings

A canal or river bridge rarely fails on load—it fails on water level, navigation clearance, and maintenance access. The common answer is a painted steel bridge on several intermediate piers, which means more obstruction to flow, more dredging, and frequent repainting shutdowns.

This bridge reverses that logic. A welded steel plate truss is fabricated from ASTM A588 Corten weathering steel, erected bare above the splash line, and left to develop its own protective oxide layer (patina). The span is set from your surveyed section, design flood level, and required navigation clearance, allowing the structure to reach across with the minimum number of supports in the water.

Technical Specifications

Build Sequence: From Plate to Crossing

1. Set the Span & Soffit Level: Section survey, design flood level, and navigation clearance fix the span, underside elevation, and deck profile. Shop drawings include camber and connection details.

2. Fabricate the Plate Truss: Corten plate is CNC cut, jig-assembled, and welded to AWS D1.5. Full-penetration welds are UT and MT inspected before leaving the bay.

3. Trial Assemble the Full Span: Every member is match-marked, splice plates are jig-drilled, and the span is trial-assembled to prove bolt holes and node geometry.

4. Erect & Bolt On-Site: Modules arrive in container loads, are lifted as a single span, and bolted with A325 / A490 HSFG bolts. No site welding is required.

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Customization (What Can Be Tailored)

• Corrosion Zoning: Bare weathering across the span with a galvanized splash zone, or a fully galvanized/painted system for industrial/effluent channels.

• Deck Surface: Steel grating (drainage/slip resistance), timber (park aesthetics), or composite panel (quiet pedestrian use).

• Pier Strategy: A full clear span with no pier in the water, or an intermediate pier to shorten the span and reduce steel weight. (We can price both schemes side by side).

• Access & Security: Pedestrian only, shared with light maintenance vehicles, or fitted with anti-climb mesh and lockable gates.

Scope of Supply

• Match-marked truss segments, floor beams, and bracing members.

• A325 / A490 bolt sets, nuts, washers, and splice plates per node.

• Bearing pads, anchor assemblies, and drainage details.

• Erection drawings, bolt schedule, and lifting point plan.

• Mill test certificates, welding records, and inspection reports.

• Optional: Decking, railing infill, access gates, and life-saving bases.

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Buyer FAQ

Q: How is the design flood level handled?
A: The soffit level is set from the design flood level for the required return period plus freeboard, using hydrology data supplied by your engineer. We size the truss depth to suit that clearance.

Q: Is floating debris impact considered?
A: Yes. Drift timber, vessel, and ice loading are added as load cases where relevant. Deflector plates or protective angles can be added on the upstream face.

Q: Can the crossing be built without a pier in the water?
A: In most canal and river crossings within our single-span range, it can. The trade-off is steel weight against pier/foundation cost, so we price both schemes for your comparison.

Q: Will bare weathering steel corrode faster near water?
A: The permanently wet splash zone and tidal band are not left bare. Those zones are galvanized or coated. The well-ventilated truss above stays bare and forms a stable patina.

Q: What maintenance does it need?
A: Annual visual inspection of members, bolts, bearings, and drainage, with a bolt tension check after the first year. No repainting is scheduled.

About Our Company

Hangzhou FAMOUS Steel Engineering Co., Ltd. was established in 2002. We are an integrated structural steel manufacturer and global exporter, providing one-stop services from design and fabrication to surface treatment and export delivery.

Certified to ISO 9001 and CE (EN 1090), cutting, welding, blasting, trial assembly, and inspection are all handled in-house. The bridge stays under one roof from plate to shipment. Trial orders are welcome.

🌐 Websites: www.famoussteel.com | www.steelfabricat.com | www.structural-steelbuilding.com

Contact Us

Share your survey data, flood level, span requirements, and project location. We will provide a tailored bridge scheme (including bare vs. pier options) and a competitive quotation.

Reach out today to discuss your river or canal crossing project.