This technology is an assembly that joins factory-produced upper and lower concrete box girders on-site to form a closed cross-section. The girders are first temporarily connected, then integrated by inserting and anchoring connecting members through holes that penetrate from the top surface of the upper girder to the bottom surface of the lower girder.
Urban bridges often feature sharp curves due to space constraints, leading to the frequent use of steel box girders, which are easier to shape but involve high initial costs and ongoing maintenance. Modular methods using precast concrete still require on-site casting, causing traffic congestion, dust, and noise, and are typically limited to long-span bridges, making them difficult to apply to bridges with small radii of curvature.
This technology uses the contact surfaces of the side plates of an upper girder (with deck and flange) and a lower girder (with bottom plate) as split planes. It uses screw sockets in the side plate grooves to temporarily connect the girders with steel plates, then inserts and tensions tendons through first and second through-holes. The PSC girders can be curved longitudinally, and assemblies are joined by tensioning prestressed joints in longitudinal connection holes. Suitable for sharp-curve urban ramps, interchanges, elevated roads with traffic restrictions, and light rail structures, it enables DfMA-based construction without on-site casting, reducing construction time and lowering costs compared to steel box girders.
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