匝道桥单点连续顶推施工技术研究OA

Incremental launching method is a commonly used construction method in the upper part of the bridge,which has the advantages of strong spanning ability,not affecting the traffic under the bridge,suitable for high pier operation and so on.Taking the ramp bridge of an existing expressway as an example,this paper introduces the construction method of the combination of hoisting and single point continuous jacking of the bridge.In the process of jacking,some control measures are taken,such as central axis deviation,local instability,vertical alignment of beam,stress monitoring,lateral displacement instability,pre-camber and so on.The strength and stiffness of guide beam and steel box girder meet the requirements,thereby can be used to guide bridge construction and provide reference for similar bridge construction.