Self-healing steel box girder technology represents a groundbreaking advancement in bridge engineering, enabling infrastructure to achieve extended lifespans through autonomous repair mechanisms. By integrating microcapsule-based healing agents and shape memory alloys, these structures can automatically seal cracks and recover deformation, mimicking biological self-repair. This innovation reduces maintenance needs by over 60%, cutting lifecycle costs and minimizing traffic disruptions. Environmentally, it slashes CO₂ emissions by ~80,000 tons per bridge, equivalent to planting 400,000 trees. Already adopted in projects like the Hong Kong-Zhuhai-Macao Bridge, the technology is projected to dominate 30% of global large-scale bridge construction by 2030, signaling a transformative shift toward sustainable, resilient infrastructure. The future of "immortal" bridges has arrived.

Steel box beam, also known as steel box girder bridge, is a commonly adopted structural form for long-span bridges. Renowned for its exceptional strength and rigidity, it finds extensive application in highways, railways, and urban rail transit systems. Below are several notable examples showcasing