Study On Construction Control Of Concrete Filled Steel Tubular Arch-Continuous Beam Composite Bridge

The railway needs to adapt to long span railway bridge with largervertical loads when the railway is crossing rivers, lakes or rills.The new bridge structure system which combines CFST arch bridges withprestressed concrete continuous beam can satisfy this requirement.Objectively, this system promotes the development of this kind ofbridges. The construction methods of this kind of bridges consistof “the girder precedes the arch”and “the arch precedes thegirder”. But there are many construction methods of prestressedconcrete continuous beam bridges. Among them, two methods are widelyapplied, which are cantilever casting and cantilever erection.However, as these two methods will contribute to more complexinternal force and displacement changes, so the bridge constructioncontrol is essential in order to ensure the construction quality ofthe bridge and the safety of bridge construction. This thesis is ananalysis study of construction control techniques constructiontechniques for long-span pre-stressing concrete continuous beambridge, which bases on the data analysis of the cantileverconstruction of continuous beam and the construction of steel tubearch rib support.The main contents of this study including:(1)Analyzes the construction contents, methods and features ofthe concrete filled steel tubular arch of prestressed concretecontinuous beam bridge, and explores the current status of construction control, meanwhile, compares the structure analysismethods during the construction control.(2) Through the model theory, calculates the construction camberof continuous girder and arch rib, the control stress of controlsection and the stress state of the bridge structure so as to providea theoretical basis and guarantee for the construction progress andthe operation state of the bridge.(3) By calculation and analysis, contrastively analyzes cableadjustment sequence according to three different ways: continuousbeam bridge and the design goal of the bending moment of arch ribas control target, cable forces under the finished state of thebridge will be determined, by the method of iteration on suspendertension.(4) decides the monitoring method and construction plan,establishes construction control system, identify and adjust thedesign parameters during the calculation of simulated construction.(5) With an aim to have a good basis for the late bridgeconstruction, analyzes the errors in the process of constructionaccording to the control parameter, and comparatively analyzes andadjusts errors based on theoretical calculation and measured resultsso as to guarantee the construction quality and safety.