Research On Monitoring Technology Of Cantilever Construction Of Prestressed Concrete Continuous Rigid Frame Bridge

With the rapid development of China’s economy and the vigorous construction of transportation,Prestressed concrete continuous bridges are used in many bridge constructions due to their strong ability to cross,reasonable force and adaptability.But,in the construction process,it is necessary to ensure that the line shape and structural force of the bridge meet the design and specification requirements.Because of the difference between the construction environment and the characteristics of the bridge itself,The factors affecting the linear shape and structural stress of the bridge are complex and changeable,Construction monitoring should be carried out for bridge construction process,Research and analysis of the shape and structural force of bridges,To ensure smooth and stable bridge structure and structural safety.This paper relies on the Liangquan Village Bridge of Baoji transit highway as the project support.The monitoring method,content and purpose of bridge cantilever construction are introduced in detail,The finite element simulation calculation model of Midas/Civil(65+120+65)m continuous beam based on the analysis of formal dressing was established,Analysis of structural displacement and stress at various construction stages,The theoretical values of deflection and theoretical values of stress for each critical section are given.Developed a construction monitoring site implementation method,Determined the location of each monitoring section and measuring point,And real-time data monitoring;Compare measured data with theoretical data,The rule of linear and stress development changes of bridges are obtained.Monitoring analysis results showed,Computational model and construction monitoring method are scientific and reasonable,Ensured stable and smooth line shape,Bridge line shape and structural force meet design and specification requirements,Achieved the purpose of construction control.It can provide reference for construction monitoring of prestressed concrete continuous rigid frame bridge under similar conditions.