南京大胜关长江大桥钢梁架设与合龙技术

京沪高速铁路南京大胜关长江大桥主桥为2联(84+84) m连续钢桁梁+(108+192+336+336+192+108) m六跨连续钢桁拱桥.大跨度连续钢桁拱主跨钢梁采用3层吊索塔架,钢梁与墩旁托架固结、3层水平索架设方法,主跨合龙采用以调整斜拉索和水平索、钢梁预先纵移为主要手段,不需顶落梁,实现钢梁跨中合龙的新技术.

Techniques for Erection and Closure of Steel Girders of Dashengguan Changjiang River Bridge in Nanjing

The main bridge of Nanjing Dashengguan Changjiang River Bridge on Beijing-Shanghai High-Speed Railway is a steel truss arch bridge composed of two units of (84+84) m continuous steel truss girders and six spans of (108+192+336+336+192+108) m continuous steel truss arches. The steel girders of the main spans of the long span continuous steel truss arch bridge were erected by the aid of the three-level tower bents, fixity of the girders with pier-side brackets and the three-level horizontal cables. The closure at the midspans of the steel girders was realized by the new technique mainly by means of adjusting the stay and horizontal cables and longitudinally moving the girders in advance without jacking up and down the girders.