Key Techniques for Erection of Steel Truss Girders of Dashengguan Changjiang River Bridge in Nanjing

The span arrangement for the steel girders of Nanjing Dashengguan Changjiang River Bridge on Beijing-Shanghai High-Speed Railway is 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 and the steel girders are composed of the triple steel main trusses that are characteristic of the novel structural system,high technical standard and challenging erection.In the erection of the girders,the techniques of the double cantilever erection and multi-point closure at midspans for steel girders have been applied.The girders for the main spans of the Bridge are erected by the double cantilever erection method and the pier-side brackets at the main piers are temporally rigidly fixed with the girders.At the main piers No.6 and No.8,the cable bent towers are arranged while at the main pier No.7,the temporary horizontal cables are used for erection of the girders.For the closure of the steel girders,the 192-m girders at both the side spans will take place first,the two spans of the 336-m girders at the main spans will then.This paper highlights the key techniques and the principal process of erection of the steel girders of the Bridge.