The Research And Apllication Of Forming Arch Rib For Construction Control Of Concrete-Filled Steel Tubular Arch Bridge With Long Span

The construction of CFST arch bridge with long span is divided into many working procedures, which are completed step by step. The processes of the construction are long and complex. So the ricontrol of construction is the guarantee of achieving design objective of the CFST arch bridge. Taking MAOCAOJIE Bridge of NANXIAN in Yiyang city as an instance, introduced the research and application for construction control technique during the stage of lifting of the arch construction and the steel pipe closure construction control completed. At the same time, many problems on construction control technique for CFST bridge are discussed in this paper, including: analysis method of simulating construction phase, construction monitoring technology, analysis on the error in construction control and parameter identification.When lifting the arch rib, the thought was suggested that to make the line font as every working condition target line font. And take this as principle having suggested that the increment ascertains the method of exchanging the rope scheme owing to rope force. The method can greatest cut down the times of exchanging rope under guarantee construction control precision premise. This method has obtained a better effect by applying on MAOCAOJIE bridge. After lifting, because the temperature of closure space-time steel tube is higher than the temperature designing criterion, we adopt the internal force adjustment scheme which was equivalent to last quarter pole in combining with pressure weight to amend the temperature of the time of closuring.After closuring, We have analysed the condition which may appear during the concrete pouring process. and verified the theoretical analysis achievement.For diminishing error in process being under construction,impact of CFST Arch Bridge Construction Control accuracy of the error factor analysis, based on the principle of least squares method is derived according to the nodal displacements measured parameters of the basic equations of error identification, and its application Maocaojie Bridge control parameter estimation.