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In flexible boom in China, through arch bridge is a large number of widely distributed, most of the hidden dangers exist to varying degrees. Middle and lower-supporting arch across the structure, the boom is a key member of the Contact Deck Systems Rib. However, with regard to the construction of the arch bridge suspender spreader, layout, design criteria, security criterion service damage, life prediction, replaceable programs, there is no clear point of order, specification. Engineering design, repair, diagnostic practice, often by virtue of the subjective understanding and learn from experience. Designed so that no specification judge without basis, security uncertain. Lot of bridge health test results obtained by the boom load behavior of existing knowledge is far from the nature of the problem. Arch bridge suspender research is very necessary. In reference to a number of domestic and international bridges commonly used to detect and Hanger force detection method based on the combination of a large span through Arch Bridge - of Guangxi yongning Yongjiang Bridge Hanger force detection and replacement project examples of such bridge suspender force detection methods were studied. Its comprehensive testing in accordance with the the arch bridge test content and methods, diseases reason based on the test results, a detailed theoretical analysis to identify the causes of the disease and provide the basis for the repair and reinforcement; Hanger Force the characteristics and boundary deduced cable force is calculated and used the tension step method and optimization algorithm to identify the size of Hanger Force. Long Span Arch Bridges in the repair and reinforcement design focus is to replace the boom, relying on the repair and strengthening works to Guangxi yongning Yongjiang Bridge, and conducted in-depth study of the boom structure, bridge suspender injury status quo. First analyze the damage reason for the boom main components of the cable anchorage, protection, corrosion mechanism, to a comprehensive understanding of the boom structure and damage, which provide a theoretical basis for the next replacement. Design calculation method according to related specifications, boom force to explore computationally, provide the basis for calculating boom replacement. Finally, detailed construction program was developed based on the results, the choice of modular boom to be replaced at the same time the Bridge of Guangxi yongning Yongjiang the boom construction control in order to ensure the safe construction boom replacement and with practice to make some measures and recommendations.
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