Several Key Technology Research In The Process Of Large Span Arc Bridge Integral Lifting Construction

Tied-arch bridge without thrust is a beam-arch combination system bridge which possesses both arch and girder’s advantages.It combine arch and grider’s basic structures together,give full play of the structural properties of grider and Arch.Arch rib integral lifting has assembled a high precision,good structural integrity, short duration, liable quality,construction is simplified, less risky,safe and reliable etc.With the deepening of the theoretical research, at present,for tied arch bridge design and analysis is no longer difficult.people gradually shifted the focus of research to the technical issues that may arise during the construction process.This article takes Fenghuang No.3 Bridge in Guangzhou as the engineering background,some key technologies in the process of its construction are analyzed,The main research content includes the following several aspects:(1)According to the field measurement and finite element software simulation analysis comparison,analysis of arch rib integral lifiting geometric nonlinear problem in the construction process,then get the influence of geometric nonlinear effect;(2)Analysis the temporary cable prestress and corrosion of steel strand problems by measuring the deformation of arch rib at different times;(3)According to the actual construction process,the arch foot horizontal displacement is very sensitive to the temporary tie force.It will affect the arch closure after the arch lifting.Propose another temporary tie bar scheme, comparing the advantages and disadvantages of the two programs and make the choice of proposal;(4)Analysis of test problems of suspender force by calibrating the tensile force on-site,combined with finite element method,frequency method.Calculation method of equivalent length of suspender and derives the practical formula ofsuspender force.In this article,the results of analysis and calculation provide guidance for the construction of the bridge.The construction of the same kind of Bridges in the future has a very good reference.