This technology features an internally reinforced steel pipe structure where clamps are installed at both ends inside the pipe to secure the plate ends. A tensioner fixed to the bottom interior of the pipe pushes the plate upward, applying tension that pulls the pipe toward the center, thereby exerting compressive force.
Pedestrian bridges are smaller and lighter than road bridges, requiring sufficient rigidity for user safety and protection against dead loads, live loads, seismic activity, and deflection due to strength degradation. Existing methods using internal cross-bracing often involve concrete, which increases weight and leads to strength loss if the reinforcement corrodes. Similarly, external steel girder reinforcement systems add weight and are prone to corrosion.
This technology features a tensioner divided into a fixed base and a vertically moving part, allowing for easy tension adjustment by locking the moving part at the desired height with bolts and nuts. The contact point on the moving part prevents plate slippage. The clamp body, designed with the same curvature as the steel pipe, is screw-fastened to the interior, securing the carbon fiber reinforced plastic (CFRP) plate. A saddle roller redirects the plate, while auxiliary reinforcement members—comprising inner/outer loops and diagonal/vertical frames—support vulnerable areas. Applicable to landmark pedestrian bridges, river-crossing bike paths, and aging girder repairs, this system adds minimal weight, resists corrosion, and allows for tension recovery by simply tightening the bolts if the structure loosens over time.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport for the development of carbon-polymer corrosion-zero reinforcement alternatives.
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