New 67m Single-Span D-Type Modular Prefabricated Steel Bridge Shipped to Liberia for Rural Traffic Upgrade

Our company has successfully completed the customized fabrication and full shipment of a high-performance modular prefabricated steel bridge destined for rural infrastructure upgrading projects in Liberia. As a key cross-river traffic solution for local remote areas, this tailor-made 67-meter single-span D-type (C3DDR) modular prefabricated steel bridge adopts optimized 200-type nose girder configuration and professional structural adaptation design, perfectly fitting complex river terrain and road connection conditions in Liberia. All structural components are prefabricated in strict accordance with international steel bridge standards, ensuring outstanding durability, stability and on-site assembly efficiency for long-term local operation.

Core Technical Specifications of the Liberia Bailey Bridge Project

This project features a 67-meter single-span bridge composed of 22 standard truss sections, adopting classic C3DDR D-type structural form to enhance overall structural rigidity and load-bearing performance. Equipped with a matched 200-type nose girder, the nose girder surface is treated with high-quality alkyd paint, which provides excellent anti-rust, anti-corrosion and weather resistance, adapting to Liberia’s tropical high-temperature and humid rainy climate, effectively resisting daily wind and rain erosion and extending the service life of auxiliary structural parts.

In terms of traffic and deck design, the bridge is configured with a 4.2-meter single-lane main traffic lane, equipped with standard anti-collision guardrails on both sides to ensure safe passage of local engineering vehicles, daily transport vehicles and light-duty cargo vehicles. Meanwhile, a 1.05-meter external hanging pedestrian walkway is specially added, realizing the separated passage of vehicles and pedestrians, greatly improving the safety and practicality of rural road crossing facilities. The bridge deck system adopts H500+140 specification cross beams and matched high-strength bridge panels, with stable structural bearing capacity, strong deformation resistance, and good adaptability to frequent local traffic and complex road conditions.

Professional Adaptation Design for Abutment Terrain Conditions

Aiming at the actual terrain constraints of the project site, our technical team has completed targeted abutment optimization and width adjustment design. The original abutment width is 6 meters, and the overall width is expanded to 6.5 meters through 28-standard-section widening construction, which effectively solves the problem of narrow foundation of local riverbank abutment, optimizes the stress distribution of the bridge foundation, and improves the overall stability of the bridge body. In view of the 1.18-meter height difference of the on-site abutment, we adopted customized slope adjustment and structural leveling technology during the design stage, ensuring seamless docking between the bridge body and the access road, avoiding traffic obstacles caused by terrain height difference, and guaranteeing smooth and stable vehicle and pedestrian passage.

Project Value and Advantages

As a high-standard prefabricated steel bridge, this 67m D-type modular prefabricated steel bridge features rapid on-site assembly, no complex concrete curing process, and reusable modular components, which can quickly solve the problem of blocked cross-river traffic in remote areas of Liberia. The overall structure is sturdy and durable, with low later maintenance cost, fully meeting the long-term use needs of local rural infrastructure. The humanized design of vehicle-pedestrian separation and safety guardrails also fills the gap of safe crossing facilities in local rural areas, bringing reliable traffic guarantee for local residents’ travel and regional economic development.

Our company always adheres to customized design for overseas infrastructure projects, accurately matching the terrain, climate and actual usage needs of different regions, and provides one-stop services including structural design, standardized production, anti-corrosion treatment, complete supporting accessories and full-process shipment guidance.