Sutong cable stayed bridge, bridge deck erection gantries using strand jacks

The Sutong Cable stayed bridge in China is the longest spanning cable stayed bridge in the world. The bridge has a main span of 1088m and crosses the Yangtze river approximetaly 100km inland from Shanghai. The steel orthotropic deck for the bridge was fabricated offsite and then delivered by barge to the bridge site in 16m long segments weighing up to 450 tonnes each. The delivery barges were moored in the river below the bridge and the deck segments were then lifted to final height and aligned with the previously erected deck segment by eight purpose made deck erection gantries . DLT were sub-contractors for the design, supply and site supervision of these deck erection gantries, to main contractor 2nd Navigation Engineering Bureau. The first deck segement was erected on 9th November 2006, an operation which included a 125% overload test and a 110% dynamic test. The last segment was erected on 9th June 2007.

The Sutong Cable stayed bridge in China is the longest spanning cable stayed bridge in the world. The bridge has a main span of 1088m and crosses the Yangtze river approximetaly 100km inland from Shanghai. The steel orthotropic deck for the bridge was fabricated offsite and then delivered by barge to the bridge site in 16m long segments weighing up to 450 tonnes each. The delivery barges were moored in the river below the bridge and the deck segments were then lifted to final height and aligned with the previously erected deck segment by eight purpose made deck erection gantries . DLT were sub-contractors for the design, supply and site supervision of these deck erection gantries, to main contractor 2nd Navigation Engineering Bureau. The first deck segement was erected on 9th November 2006, an operation which included a 125% overload test and a 110% dynamic test. The last segment was erected on 9th June 2007.

The contract for design and supply of these deck erection gantries was let by international tender, under the control of an independent government tendering agency and subject to the recommendations of a panel of Chinese experts. The hydraulic and electrical components for the gantries were manufactured in Europe and shipped to China, where they were be assembled onto fabricated steel frames made in China.


The gantries work in pairs to lift and align the deck units. Each gantry has one 290 tonne capacity DL-S290 strand jack to lift the deck unit and a system of secondary hydraulic rams to carefully adjust its final plan position and slope so that it can be accurately fitted to the previous deck segment for welding, to within a tolerance of +/- 1mm. The hydraulic systems on each pair of gantries are monitored and controlled by a single operator using our DL-P40 computer control system which ensures accurate synchronisation of the strand jacks and simple and failsafe operation.

DLT has previously been responsible for lowering of a 3050 tonne steel cofferdam on this project, using 16 No DL-S418 strand jacks monitored and controlled by the same DL-P40 computer control system that will be fitted to the deck erection gantries. More> More details of the Sutong bridge project can be found at http://www.stbridge.com.cn

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Sutong Cable Stayed Bridge. Deck erection gantries