In-service Prestressed Concretegirder Bridge Detection Evaluation Methods

Prestressed concrete structures in the natural environment, the use of the environment and the role of internal factors, with the passage of time, the material will gradually aging, structural performance will gradually deterioration, injury or damage there. The prestressed concrete bridge, this phenomenon is mainly manifested in the deterioration of concrete, prestressed tendons and ordinary steel corrosion, reduce the effective prestressed, rusty after prestressed reinforced mechanical properties and general degradation. The existence of these factors, the bridge's security, durability and the use of normal function will have a very negative impact on serious direct threat to the security structure.In China, prestressed concrete bridge on the status of defect detection and assessment there is obviously insufficient, mainly as follows:Pre-stressed concrete bridge concrete deterioration degree evaluation after the detection technology was not; positioning of prestressed tendons and prestressed pipeline pressure Pulp status of the detection technology has not in-depth study on the state of corrosion Tendon nondestructive testing technology did not study the Tendon prestressed effective detection technology research in just the initial stage, to defect after the prestressed concrete bridge durable, Security and normal function of the system, in-depth study.To solve the above problem, Chang'an University in Scientific Research and Design Institute of Chongqing Jiaotong, the Shaanxi Provincial Roads Authority, in reference to the first Highway Survey and Design Research Institute, the Harbin Institute of Technology carried out the " long-span prestressed concrete bridge detection technology" research. Respectively ", in the long-span prestressed concrete bridge detection technology on research analysis report", "Tendon detection of positioning" and "prestressed pipeline grouting detection technology on the status of seven thematic study.Based on the large number of relevant research on the basis of information, analysis, evaluation, screening, recommend suitable for large, long-span prestressed concrete bridge in the application of the relevant detection technology, methods and equipment, with the traffic technology and the progress achieved in stages The results of the new technology and new methods for Feasibility Analysis and summary. Formulated the "in-service, in the long-span prestressed concrete bridge Detection Technology Guide"(Draft).Which mainly include:pre-stressed concrete bridge defect situation (Concrete deterioration of the Tendon positioning, prestressed pipeline grouting situation, Tendon rust situation tendon effective detection and prestressed) The detailed methodology for testing and use of equipment manuals, Prestressed concrete bridge defect situation sub-index evaluation of the assessment standards and prestressed concrete bridge defect Comprehensive Assessment and Evaluation Standards.