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| Research on Construction Technology for Original Section of Large Span Single T Rigid Frame Four - track Bridge |
| YI Da, HU Guo-wei |
| China Railway 3th Bureau Group Co. Ltd, Taiyuan, Shanxi 030001, China |
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Abstract Research purposes： In order to ensure the concrete construction safety and quality of the long, high and heavy original section of the large span single T rigid frame four - track and double - width curved bridge of the Tianjiayaohao Bridge，the research was done on the key construction technologies for the original section of the bridge， including the support system, the external formwork system and the construction technology of C55 polypropylene fiber concrete.
Research conclusions ： (1) Because the hydraulic integration adjustable bracket was installed on the double thin - wall top，the problem of adjusting the bracket height was overcome，so the safety risk of the support construction was reduced and the construction safety and quality of long, high and heavy original section was guaranteed. (2) A concrete self--supporting bracket system was used in bridge contact network platform, so，the foundation construction of flange could be conducted simultaneously with construction of the catenary support. In this way, the engineering cost was reduced and construction time was shortened. (3) The C55 polypropylene fiber concrete was used to improve the crack resistance of the concrete. The layered pouring and reasonable process were adopted to ensure the construction quality of the concrete. (4) This research result is available for construction of the railway high - pier long-span continuous rigid frame bridge and single T rigid frame bridge.
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Received: 14 June 2013
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2013, Vol. 30 
