下承式连续梁-拱组合桥施工方案比选研究

Research on comparison and selection of construction schemes for down-bearing continuous beam-arch composite bridge

余信贵大道月湖特大桥主桥为(30+185+30)m下承式连续梁-拱组合桥,根据连续梁-拱组合桥结构特点、桥位地形地貌、环境及交通条件,综合技术可行性、经济合理性、安全可控性3方面对缆索吊施工和顶推施工2种施工方案进行比选研究,研究结果表明:缆索吊和顶推施工方案在技术可行性上均可实现,但缆索吊施工方案临时锚固力大且临时系杆张力大和张拉空间有限,高空作业风险偏大,而顶推施工经济性较好、工期相对较短、风险性更低。综合考虑推荐在顶推施工的基础上进行施工方案深化及优化设计。

The main bridge of the Yuehu Bridge on Yuxingui(Yujiang-Xinjiang-Guixi)Avenue is a(30+185+30)m down-bearing continuous beam-arch composite bridge.A research on comparison and selection of two construction schemes,i.e.,cable hoisting installation and jacking installation,was made according to the structural characteristics of a continuous beam-arch composite bridge,the topography of bridge location,the environmental and traffic conditions,as well as the technical feasibility,economic rationality,and safety controllability.The results of research show that,both cable hoisting and jacking schemes can be realized in terms of technical feasibility,but in the cable hanging scheme,the temporary anchoring force is large,the temporary tie rod has a larger tension and the tension space is limited,and the risk of high-altitude operation is too high;while in the jacking scheme,it is more economical,the construction period is relatively short and has a lower risk.It is recommended after comprehensive consideration that a construction plan is deepened and its design is optimized on the basis of the jacking scheme.