悬臂浇筑连续梁中跨合龙是连续刚构桥施工控制重点,但目前常规锁定合龙技术还存在较多弊端.为此,研究更加先进高效的锁定合龙技术非常必要,结合蓬安嘉陵江三桥主跨 220 m 悬臂浇筑混凝土中跨锁定合龙施工技术开展研究,提出单向自动限位劲性骨架锁定合龙施工技术;优化中跨合龙临时锁定设计,并针对临时锁定施工前的测量、应力、温度等进行严格监控,从而有效解决了合拢段劲性骨架、体系转换等施工技术难题,为类似工程施工提供参考.
Design and Construction Study of Mid-Span Locking of Cantilevered Continuous Beam
Cantilever pouring continuous beam mid-span Helong is the key point of continuous rigid bridge construction control,but there are still many drawbacks of conventional locking Helong technology.Therefore,it is necessary to study more advanced and efficient locking Helong technology,and the construction technology of 220 m cantilever poured concrete was combined with the main span of the Peng'an Jialing River Three Bridges to carry out research,and a one-way automatic limit rigid skeleton locking Helong construction technology was proposed.The design of temporary locking of the middle span Helong was optimized,and the measurement,stress,temperature,etc.were strictly monitored before the temporary locking construction,so as to effectively solve the construction technical problems such as the rigid skeleton and system conversion of the closing section,and provide reference for similar engineering construction.
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