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Prestressed concrete structure in the natural environment, the use of the internal factors of the environment as well as material, over time, the material will gradually aging, the structural performance will gradually deteriorate, injury or even damage. Prestressed concrete bridge, this phenomenon is mainly manifested in the deterioration of the concrete, prestressing tendons and steel corrosion, effective prestressed to reduce corrosion of prestressed and reinforced mechanical properties degradation. The existence of these factors, the bridge safety, durability and normal use function will produce a very negative impact, serious direct threat to the safety of the structure. In China, the assessment of prestressed concrete bridge defect detection technology and there is obviously insufficient, mainly as follows: after the detection of the degree of deterioration of prestressed concrete bridge concrete evaluation immature technology; the prestressing tendons positioning and prestressed pressure pulp status detection technology is no in-depth research; non-destructive technique for prestressed reinforcement corrosion status did not research; research on the prestressing tendons prestressed detection technology in the fledgling stage, durability of prestressed concrete bridge defect , security and proper use no systematic, in-depth research. In order to solve the above problem, Chang'an University in conjunction with the Chongqing Communications Research and Design Institute, Shaanxi Provincial Highway Bureau, The First Highway Survey and Design Institute, Harbin Institute of Technology, in the long span bridge prestressed detection technology research, , long span bridge prestressed detection technology research and analysis report, the \In this paper, on the basis of a large number of relevant research data, analysis, evaluation, screening, recommended suitable for large-span prestressed concrete bridge applications correlation detection techniques, methods and equipment, combined with the Western Transportation Research and progress of the project and made stage conducted a feasibility analysis and summary of achievements, new technologies and new methods. Developed Battle span concrete bridge prestressed detection technology Guide (draft). Which mainly include: prestressed concrete bridge defect status (the degree of deterioration of concrete, prestressing tendons positioning prestressed grouting conditions, the prestressing tendons corrosion condition check and the prestressing tendons effective prestressed) detection methods and equipment manual , prestressed concrete bridge defect condition evaluation criteria and sub-indicators evaluation defect Prestressed Concrete Bridges comprehensive evaluation assessment standards.
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