四肢异形主塔施工关键技术研究及仿真分析

Research and Simulation Analysis on Key Construction Techniques of Main Four-limb Special-shaped Pylon

邓州市穰城路跨湍河大桥为主跨(90+90)m的空间框架式独塔钢-混组合梁斜拉桥,主塔采用四肢异形空间框架式独塔,设计总高为75.5 m,由分离的四肢塔和横梁组成。以跨湍河大桥为研究实例,首先简述主塔总体施工流程,其次对于主塔的施工过程中的受力情况进行仿真数值分析,最后根据计算结果对设计进行优化,确保桥塔尤其是混凝土塔肢的全截面受压,从而确保主塔施工的安全性和合理性。研究成果可为日后同类工程的施工提供参考。

The Rangcheng Road Bridge spanning Tuan River in Dengzhou City is a spatial frame-type single-pylon steel-concrete composite beam cable-stayed bridge with a main span of 90 m+90 m.The main pylon is a four-limb special-shaped spatial frame-type pylon.Its total height is 75.5 m.It consists of separated four-limb pylon and crossbeams.Taking the bridge spanning Tuan River as the research case,the overall construction process of the main pylon is described firstly.Secondly,the simulation numerical analysis is conducted on the stress situation of the main pylon during the construction.Finally,the design is optimized according to the calculation results to ensure the full section compression of the pylon,especially the concrete pylon limbs,which can ensure the safety and rationality of the main pylon construction.The research result can provide the reference for the construction of the similar projects in the future.