Research On Construction Monitoring Technology Based On Long Span Prestressed Concrete Continuous Rigid Frame Bridge

In recent years,with the improvement of China’s economic level and technological capability,the application of continuous rigid frame Bridges has become more and more common.Because of the increase of span,various uncertainties are becoming more and more significant in the construction,resulting in the high risk of continuous rigid frame bridge in the construction of engineering,so it is important to take a positive approach to cope with it.In this paper,the construction monitoring of prestressed concrete continuous rigid frame bridge with cantilever pouring method is studied based on the engineering background of a large span concrete rigid frame bridge.Cantilever construction method is a kind of common construction technology of continuous rigid frame bridge construction,the advantages of this method has overcome the unfavorable terrain makes bridge upper structure construction section points,had advantages of simple construction,lower cost,and good structural integrity and maintenance is relatively simple,the advantages of less maintenance workload.It provides a wide space for the development of bridge construction in the complex region of China.But with the rapid development of the bridge construction process,the traditional cantilever pouring method needs constant improvement and improvement in construction and monitoring,so as to adapt to the construction of a larger span bridge.So,in order to ensure the safety of long-span continuous rigid frame cantilever construction process,as a bridge internal force and linear all can satisfy the design requirement,a set of scientific construction control system is of vital importance.The main research contents and conclusions are as follows:(1)through effective construction measures,it is finally in line with the aesthetic requirements of the project.For example,combined with the construction progress of the project,the construction monitoring method is studied,and the construction is completely monitored.(2)an effective analysis is carried out through the design parameters,and the results are clear from the results of the analysis: the error of the budget,the weight of the concrete and the extent of the stress.(3)through the principle of limiting element,the finite element model is set up by scientific and technological software,and the engineering is analyzed,and the stress state of the project is controlled at last.(4)in this paper,the effect of the construction of the stage is considered by the calculation of the measured stress,and the programming calculation is carried out.Through the analysis of data,the difference between the actual and calculated values of construction shrinkage in the concrete stage is considered,and the stability of the actual stress state of the bridge construction is finally found.Taking background bridge engineering as an example,based on the temperature test,the influence of weather changes on bridge construction is analyzed,and finally the function image of temperature change in bridge construction is calculated.In the case of the maximum cantilever state,the real time analysis is carried out through the temperature.Finally,it is concluded that the temperature gradient has a great influence on the structure change.In this paper,the construction monitoring of long-span continuous rigid frame bridge and the influence factors analysis,can provide a reference for the analysis of this kind of bridge construction control,also can provide same type bridge design,testing and maintenance technical support.