Long League Bridge Jack Up Large Amplitude Of Risk Control Key Technology Research

With China's transportation infrastructure construction rapidly developed, because of being lacking clearance under the bridge,bridge settlement etc, numerous existing bridges need to be demolished to rebuild. Will existing on the bridge demolish rebuild across, it will face long construction period, the high cost and the impact on the environment problem. How to solve the above problems? Bridge whole synchronous lift-up techology emerged, it as a bridge builder would provide a cheap quicker and economical transformation way, can make the engineering cost and impact to surrounding environment reduced to the minimum.Based on the Shanghai and hangzhou highway HangShen line big bridge lift-up reconstruction project, the engineering background of large-span bridge cross number, more types, Bridges plane linear is complex, this bridge, there were 80 hole has 20m, 22m, 14.4 15.5 m, 35m, 40m six standard spans. The original bridge longitudinal have 2.5% slope after reform and longitudinal slope as 3%. Bridges strides across on a railway, highway and navigable river, Bridges strides across the way on railway and highway by obliquely, the biggest oblique Angle reaches 55°, Bridges, its roof up high will be by far the roof up domestic top, maximum jack-up height reaches to 7.442 meters, jack-up supporting height is also big, jack-up 13.58 m, former pillar high after jack-up 19.417 m high.In domestic and foreign, although there are lots of successful examples that jack-up technique applied to bridges, buildings and other structures reconstruction, as for this research project involves the shanghai-hangzhou expressway HangShen line big bridge jack-up renovation of many characteristics and difficulties, there is no similar engineering experience at home and abroad for a reference, so the system can be reference to its security stability control key technology research is meaningful and necessary.This paper mainly by using finite element program for the most unfavorable load testing situation temporary support system strength and stability, and analyze the link analysis when the bridge whole synchronous jack-up maximum allowable error, then introduces the project's main construction plan and the surveillance programs.I hope that through this research, my thesis can provide reference for large amplitude synchronous jack-up project of the later similar bridges and contribute a slender strength to the further development of the bridge jack-up technique.