Anchor rods are installed at the lower edge of the reinforcement structure on the corrugated steel plate and the corrugated steel plate of the old bridge structure, and micro expansion concrete is filled between the lower edge of the original structure and the corrugated steel plate; The widened part is reinforced with reinforced concrete stiffeners, which are set on corrugated steel plates“U”A steel mold with a rectangular cross-section is used to connect the steel mold to the corrugated steel plate using shear studs, tension anchor bolts, and other connecting structures. Micro expansive concrete is filled between the steel mold and the corrugated steel plate, followed by backfilling with lightweight foam soil. The integrated structure of reinforcement and widening can reinforce existing bridges without interrupting existing traffic, greatly improving the bearing capacity of existing bridges, widening existing bridges, and avoiding traffic, environmental, construction period, and financial problems caused by the demolition and reconstruction of old bridges. This plan can enable the original bridge to regain its function and functionality, with significant advantages such as low social impact, low-carbon environmental protection, fast and simple construction, and low cost. This scheme has been successfully applied to the reinforcement and widening project of Loudi Shimen Bridge, achieving good economic and social benefits, and is worthy of promotion and application in similar projects.

Examples of reinforcement for small and medium span bridges and culverts:

（1）Arch passage reinforcement, above which urban roads pass

（2）Reinforced solid belly stone arch bridge, located on the provincial road

（3）Widening of solid belly stone arch culvert

（4）Reinforcement of stone arch culvert

（5）Strengthening and widening of stone arch culvert

（6）Reinforcement of stone arch bridge, using corrugated board bottom plate instead of reinforced concrete base

（7）Strengthening the stone arch bridge means road reconstruction and widening, and the load standard can meet the requirements of first-class highways

（8）Strengthening and widening of simply supported beam bridge, using box structure, invertedTThe abutment back is backfilled with foam light soil, and the widened section is backfilled withCBSThe reinforced rib structure greatly improves the structural stiffness, which originates from the micro technology of municipal engineering.