港珠澳大桥非通航孔85m组合连续箱梁体系转换线形监测与分析

港珠澳大桥CB05标浅水区非通航孔桥采用85 m组合连续箱梁结构,全长5 440 m,共11联,128片组合梁,国内外如此大规模的组合梁桥建设尚属罕见。如何通过线形监测准确而高效地反应组合梁实际线形,对工程本身显得尤为重要。介绍了组合梁安装阶段的主要施工流程,重点阐述了组合梁体系转换步骤;运用Midas/Civil 2012建立了有限元理论模型;结合实际情况布置组合梁顶、底板线形监测点;选取本桥首件工程第八联组合梁为对象,将采集到的线形实测值与理论值进行了对比分析,统计偏差范围,分析偏差出现的原因,为后期改进施工措施、国内组合梁成桥高程验收标准制定以及今后类似工程建设提供了参考和经验。

Monitoring and analysis of the 85m composite continuous box girder after system transformation in the non navigable part of Hong Kong-Zhu Hai-Macao bridge

The CB05 non navigable part of Hong Kong-Zhu Hai-Macao bridge in the shallow waters adopts 85 m composite continuous box girder structure, total length of 5440 m, a total of 11 links, 128 pieces of composite beams, such a large composite girder bridge construction is rare at home and abroad. How to accurately and efficiently reflect the actual alignment of the composite beam by linear monitoring is very important for engineering itself. This paper introduces the main construction process of composite beam installation, and focuses on the steps of composite beam system transformation; The theory of finite element model is established by applying the midas/Civil 2012; Combined with the actual situation, the linear monitoring points are arranged in the top and boom plate of composite beam; The first project-the eighth combination beam of the bridge is selected as the object, the collected linear measured value and theoretical value are analyzed and compared, counting the range of deviation and analyzing the reason of deviation, for improving the latter part of construction measures, formulating the domestic composite beam bridge elevation acceptance criteria and building the similar projects provides the experience and reference in the future.