研究目的:为确保田家窑2号大桥四线双幅曲线桥2 x 108 m大跨度单T刚构“长、高、大”0号段混凝土 施工安全和质量，对0号段施工用的托架体系、外模支撑体系、C55聚丙烯纤维混凝土浇筑工艺等关键技术进行研究。
研究结论:（1)在双薄壁高墩顶设置液压式整联标高可调托架,克服了托架高程调整的难题,降低托架落 架施工安全风险,保证了“长、髙、大”0号段施工安全和质量；（2)提供的桥梁接触网平台混凝土浇筑用的自 撑式托架体系，可完成0号段翼缘板和接触网支架基础同时施工,可降低工程成本，缩短工期；（3)应用C55 聚丙烯纤维混凝土可提高混凝土的抗裂性,并采用合理的分层浇筑及布料工艺，确保混凝土的施工质量。 (4)研究成果可适应于铁路高墩大跨度连续刚构桥和单T刚构桥的施工。
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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