Welded Steel Box Girder Bridge

To prepare a project-specific quotation and structural proposal for the BR-611, KXD’s engineering team requires the following minimum information: bridge span (metres), deck width (metres), required clearance height above waterway or road, design load standard (e.g., AASHTO, Eurocode, GB, or applicable national code), site location (for wind and seismic zone data), and intended traffic type (highway vehicle, railway, pedestrian, or industrial heavy vehicle). Preliminary site drawings or concept sketches significantly improve the accuracy and speed of the engineering proposal. Enquiries submitted without full parameters will receive an indicative reference based on the BR-611 model specifications.

The welded box girder and the prefabricated truss bridge represent two different structural philosophies suited to different project conditions. The box girder offers superior torsional rigidity and a clean, closed structural profile — it is preferred for long spans, heavy eccentric vehicle loads, and projects where maintenance access to internal structural members is limited. The prefabricated truss bridge uses an open-chord configuration that is lighter in weight, more material-efficient for shorter to medium spans, and offers a visually open aesthetic. If your project involves heavy highway or rail loads over a span exceeding 15 to 20 metres, the box girder is typically the more appropriate structural choice. KXD’s engineering team can assist with structural form selection at the early enquiry stage.

Yes. KXD’s manufacturing facility is CE certified under EN 1090 and ISO 9001:2015 certified, with welding procedures documented under WPQR. All bridge projects are supplied with a full quality documentation pack, including material mill certificates, weld inspection records, dimensional inspection reports, and surface treatment records. Third-party inspection by SGS, BV, or any client-nominated inspection agency is actively welcomed at any stage of fabrication. For projects financed by development banks or subject to government procurement rules requiring demonstrable quality certification, KXD’s certification portfolio meets the most commonly encountered compliance requirements.

Bridge sections are fabricated as discrete, export-ready modules sized for standard 20-foot or 40-foot container shipping. Structural members are loaded using steel pallets to optimise container utilisation and protect surfaces during ocean freight transit. On arrival at the destination port, modules are transported to site and assembled by bolted connection — the standard method — or by field welding where project specifications require it. KXD provides a detailed erection guide and full assembly drawings with every shipment. Additionally, KXD maintains a team of experienced structural erection technicians who can be dispatched to the project site to supervise or directly manage the on-site assembly process, depending on the project scope and agreement.

The BR-611 is available with several surface protection systems tailored to the environmental exposure conditions of the project site. For permanent installations in coastal, tropical, marine, or industrially polluted environments — where long-term corrosion resistance is critical and maintenance access is difficult — hot-dip galvanizing is the recommended base protection system. For projects where a specific colour finish or aesthetic integration is required, a high-build epoxy primer and polyurethane topcoat system is available, either as a standalone coating or applied over a galvanized substrate for maximum protection life. All surface treatment specifications are confirmed during the engineering review stage based on project environmental exposure category.