Adaptive Geometrical Construction Control Method of Super Long Span Cable Stayed Bridges

The method of profile and internal force control during the construction of super long span cable stayed bridges is introduced. A new strategy, the adaptive geometrical control concept, has been used in this method. Comparing with traditional construction control method in which the cable tension is the main control means, the method introduced here can apparently improve the geometric profile and the state of internal forces of the bridge when the construction completed, decrease the influence of surveying errors caused by the vibration of the long cantilever girder and the temperature change of environment. The principle of the method has been described. The control system and its establishment for long span cable stayed bridges are introduced. The method has been successfully used in the construction control of Sutong Yangtze River Bridge with 1088m main span which is the longest span cable stayed bridge in the world and Edong Yangtze River Bridge with 926m main span, and is being used in the Jiashao Bridge which is a 6-tower cable stayed bridge with main span of 428m.Through the practices of Sutong Bridge and Edong Bridge, it is proved that the new method is effective and advantages mentioned above can be used.