The Analysis On Construction Control Of Continuous Rigid Frame Bridge With High Piers And Long Span

With the rapid development of China’s transport services, continuous rigidframe bridge with high pier and long span become more widely, especially in need ofsuch bridge to span the canyon in the western mountains, rivers and so on. The mostcommon construction method of continuous rigid frame bridge with high pier andlong span is cantilever mold. In the process of the construction, the structure will beaffected by lots of certain and uncertain factors which continuously lead to change ofbridge internal force and deformation. Furthermore, the regulating range of structuralforces is very small when construction completed. Therefore the construction controlmust be carried out in the construction process of bridge, to ensure the geometricshape and the internal force according with the design requirements and to ensure theclosure of the whole bridge successful. The main contents are as follows in thisthesis:Firstly, the paper introduces the concept, features and construction methods ofcontinuous rigid frame bridge with high pier and long span briefly, discusses themeaning and the actuality of the development of other domestic and foreign ofconstruction control, discusses the purpose, content, and theory methods of theconstruction control, and simply describes the theory and modeling mechanism ofgray system.Secondly, the practical application research of construction control was based onthe construction of the Tianwan River Bridge, whose main bridge is a PC continuousrigid frame bridge with spans of78+140+78m and its highest Pier is87.5m high.According to the actual bridge structure, the author established a simulation model toanalyze and simulate the process of the bridge construction. The author emphaticallyintroduced the theory and method of construction control of the geometric shape andthe stress of the continuous rigid frame bridge, analyzes the impaction of the maindesign parameters which may affect the structural state for more targeted to modifythe model and improving work efficiency, and set up the GM(1,1) Model of thebridge. The GM(1,1) Model is modified to improve the forecasting precision. And itcalculates and forecast the deformation of the boxed girder, and the result is satisfied.The paper reflect the application in a actual project of the construction control theory by the construction control of Tianwan River bridge, by comparing the actualmeasured value and its calculated value of the structure and correct the error betweenthem, and achieve the purpose of the construction control. The construction ofTianwan River Bridge can meet the design expectations because of the monitoring ofthe whole construction process.At last, based on the comparative analysis of the theoretical value and themeasured data of the geometric shape and the stress of the structure in the process ofconstruction control, the author researched the deflection of the girder and thechanging course of the stress of some crucial sections. Some useful conclusions canbe referenced by similar structures’ construction control in the future.