黄冈公铁两用长江大桥桥塔液压爬模施工技术

摘要

The pylons of Huanggang Changjiang River Rail‐cum‐Road Bridge are H‐shaped re‐inforced concrete structures rising to 190 .5 m ,w hich are constructed by hydraulic climbing form‐work method .To suit the requirements of using hydraulic climbing formwork to conduct rapid construction of the high‐rise pylons and ensure the safety of construction ,in light of the structural characteristics of the pylons ,the 6 m long sectional hydraulic climbing formwork evolved from the 5 m long sectional hydraulic climbing formwork was selected ,and the structure of the hydraulic climbing formwork was optimized ,including monolithically fabricating formwork with large deco‐rative grooves and large chamfers that are fixed to the hydraulic climbing formwork .At the large decorative grooves ,brackets are added beneath the attached walls .The back‐moving platform of the upper supports on the lateral walls of the inner and outer side of the tower legs must be extend‐ed by a length of 50 cm .By the rational arrangement of trails ,the hydraulic climbing formwork for pylons only experience one shift at the turning corners of the intermediate and lower pylon legs , avoiding the risk of multiple overhead shifts of the hydraulic climbing formwork .The hydraulic formwork was globally shifted in groups ,which accelerated the construction speed of the pylons . The engineering practice proves that by using the hydraulic climbing formwork construction tech‐nique ,the aim of highly efficient and rapid construction was realized and the construction process w as safe .%黄冈公铁两用长江大桥桥塔为H形钢筋混凝土结构，塔高190．5 m ，采用液压爬模法施工。为满足液压爬模在高塔施工过程中快速化施工的需求并确保施工安全，针对桥塔结构特点，选用将5m节段液压爬模改进成6m的节段液压爬模进行桥塔施工，并对液压爬模结构进行优化改进，包括整体制作大装饰槽和大倒角模板并固定在液压爬模上，在大装饰槽处附墙装置下增加牛腿，将塔柱内、外侧面液压爬模上支架后移平台加长50 cm。通过合理布置桥塔液压爬模轨迹，桥塔液压爬模只在中下塔柱转角处进行1次转换，避免了液压爬模在高空中多次转换的风险；液压爬模采用分组整体转换，加快了桥塔施工速度。实践证明，该桥采用液压爬模施工技术，实现了高效快速化施工目标，且施工过程安全。