郑州黄河公铁两用大桥主桥钢梁架设方案研究

Research of Erection Schemes for Steel Truss Girders of Main Bridge of Zhengzhou Huanghe River Rail-cum-Road Bridge

郑州黄河公铁两用大桥主桥分2联布置,立面采用三主桁斜边桁的空间桁架形式,其结构新颖,架设施工难度大。经过多方案比选和研究,第1联钢桁梁采用多点纵向拖拉施工方案架设,第2联钢桁梁采用跨线龙门式吊机悬臂架设。

The steel truss girders of the main bridge of Zhengzhou Huanghe River Rail-cum-Road Bridge are to be arranged in two continuous units. In the elevation, the girders are of a spatial truss type composed of three main trusses with their side trusses set in inclined positions. The girders are structurally novel and the erection thereof is challenging. Through comparison and research of different erection schemes, it is determined that the first unit of the girder is to be erected by the multi-point longitudinal hauling scheme while the second unit of the girder is to be erected by the cantilever erection scheme by gantry crane spanning the Bridge alignment.