南京大胜关长江大桥钢梁安装设计与计算

Design and Calculation for Erection of Steel Girders of Nanjing Dashengguan Yangtze River Bridge

南京大胜关长江大桥为主跨2×336 m连续钢桁拱桥,大桥采用3片主桁结构体系,桥面系采用正交异性钢桥面板结构,结构复杂,钢梁架设难度大。在钢梁安装方案研究过程中,进行了先拱后系杆和拱与系杆同时安装的比较,最终确定拱与系杆同时安装的方案。大桥钢梁采用从两侧往跨中架设,先边跨合龙,后中跨合龙的总体方案。针对钢梁架设安装方案,对钢梁关键安装工况进行了计算,并分别对平弦和主拱合龙状态进行分析,提出了切实可行的合龙方法,为大桥最终精确合龙提供理论依据。

Nanjing Dashengguan Yangtze River Bridge is a continuous steel truss arch bridge with a main span of 2 x 336 m and three main trusses structures. The bridge deck is of orthotropic plates and it is very difficult to erect the steel girders. Two methods was compared for the erection of steel girders, one is that arch is firstly erected and then tie rods, and the other is that arch and tie rods are erected simultaneously, and the latter was finally adopted for this bridge. The steel girders of the bridge were erected from side spans to the mid-span, and the mid-span was closed up after the closure of side spans. Calculation was carried out for the key erection conditions of steel girder segments. In addition, calculation and analysis was also conducted for the horizontal chords and the closure of main arch. On this basis, a practicable method of closure was worked out and implemented, which led to final accurate closure of the steel girders.