Statistical Analysis and Research on Common Defects of Precast Slab Girder Bridge

maintenance and reinforcement Abstract: In this paper, the small and medium span precast hollow slab girder bridge in Dongguan city is taken as an example in order to statistically classify common defects of precast slab girder bridge respectively from the aspects of the bridge decking, upper structure and lower structure. Moreover, possible causes and disposal measures are analyzed from the perspectives of operation and maintenance. Basic technical data are provided for the research on precast slab girder bridge in terms of regular inspection, maintenance and reinforcement, and formulating conservation measures etc. Dongguan, also known as "Guancheng", is located in the east coast of the Pearl River Estuary, south of Guangdong Province, China. It is the head of the "Four Tigers of Guangdong" and is referred to as "the Industrial Workshop of the World". With strong manufacturing and complete industrial system, Dongguan, whose manufacturing output accounts for more than 90% of the above-scale industrial output value, is one of the world's largest manufacturing bases. Dongguan features a mainly export-oriented economy. Especially in industry, most of the capital, raw materials and product sales are not separated from the international market, which means the road traffic in Dongguan city plays a vital role in urban development. Meanwhile, the healthy operation of bridge (especially the small and medium span bridge) is a guarantee of smooth traffic. Thus, it is strategically significant and has a far-reaching impact on Dongguan's advancement to research and analyze typical defects of small and medium span bridge, to grasp the degree of typical defects' damage to the bridge structure, and to master the technology and security of the bridge structure.