Study On Structural Analysis And Closure Technic Of The Multi-span Rigid-frame Bridge

With the advance of the theory of bridge design and continuous improvement of the construction technology , the Continuous rigid frame bridge plays an important role(Steady rise) in the bridge family according to its good structural stability , cross-ability , expressed construction progress , economic cost , comfortable traveling and so on. This bridge type has strongly competitive when span between one hundred and three hundred meters. However, there are still some questions on the theory of its design and construction process.Basing on the He Jia Ba Bridge which situates in highway of Chongqing to Changsha belonging to the paragraph of You Yang to Da Han, this paper analyse structural parameters and closure Technic of the Multi-span Rigid-frame Bridge.The main job to do is as the following:1)Basing on the Hejiaba Bridge, sevral calculation models are set up to analyse the influence to the bearing of continuous rigid frame bridge with different hight of beam and variable line of beam bottom2)The structure of cross-section of pier in Continuous rigid frame bridge is discussed, analyse the structure of cross-section of double thin-walled pier and its bearing, discuss the factors that affected the stability of double-buckling thin-walled high pier.The results indicate that the wind load and closure jacking force are the main influences for the stability of double-buckling thin-walled high pier.3)Discussed the key factors to be considered when the multi-span continuous rigid frame bridge close up , put forward the method of calculating the pushing volume and introduced the method of calculating the jacking force.4)Contrary to The He Jia Ba Bridge (Six cross-linked), through the Selection of the close up programs, Proposed and demonstrated the close up orders: Fist side span ,second medium span and last other medium span .Before closuring , the method has the merit of small jacking force and obvious effect.