中承式连续梁拱组合式桥梁无支架施工的挠度控制

Deflection Control of Construction without Support of Midheight-Deck Continuous Beam Arch Composite Bridge

本文结合浙江省内的一座中承式连续梁拱组合式桥梁碧云桥的设计与施工实践,从介绍桥梁成桥状态的优化原理着手,随后重点阐述了中承式连续梁拱组合式桥梁先拱后梁法施工结构预拱度设置的方法以及影响挠度控制的主要因素,从而提出了可行的挠度控制方案,确保了结构的合拢精度和成桥线形。

In combination with the practice of the design and construction of Biyun Bridge of midheight-deck continuous beam arch composite bridge in Zhejiang Province the paper firstly introduces the optimum principle of built bridge state of the bridge,then it mainly states the method of installing the structure camber by construction method of first arch later beam for midheight-deck continuous beam arch composite bridge as well as the main factor of influencing on deflection control.So it puts forward feasible deflection control option to ensure the closure precision of the structure and built bridge linearity.