Research on Key Technology of Multi-point Synchronous Incremental Launching Construction for Precast Slope of Continuous Beam Arch Bridge with Variable Slope
In recent years,incremental launching method has been widely used in the construction of bridges with constant cross-section across existing railways because of its technological characteristics of minor traffic interference under the bridge.The reconstruction project of the overpass across Changbei Station on Shuang Gang Street in Nanchang is the first asymmetric continuous beam arch bridge in China,which adopts slope prefabrication and multi-point synchronous incremental launching construction with variable slope.In the construction,the method of pouring the beam body in layers-drilling through the bottom plate-installing the positioning bracket is put forward to install the steel arch foot,which effectively solves the problem of difficult positioning of the prefabricated steel arch foot on the slope.The method of hanging plumb hammer on the central axis of the beam and laying grid paper on the ground can continuously calibrate the lateral deviation of the beam during construction,thus solving the problem that the incremental launching construction of asymmetric structures across the railway cannot be monitored on line;with the help of pier,leveling pad and auxiliary jack,the pier-on-beam technology and beam-off technology are realized on variable slope top.Efficient and simple methods are adopted in the construction,which ensures the construction quality and safety of variable slope jacking of asymmetric continuous beam arch bridge across stations,and provides reference and experience for the monitoring of incremental launching construction of similar bridges.
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