DWH Continuous Rigid-frame Bridge Construction Monitoring Analysis And Impact Parameter Test Analysis

The suspension cantilever construction method is usually adopted in the construction of prestressed concrete continuous rigid frame bridge.The linear and internal force of the bridge will be closely related to the bridge structure’s dead weight,prestress tension,concrete shrinkage creep,temperature change,second-stage constant load,running load,concrete cantilever construction process and so on.Although software can be used to carry out numerical simulation analysis on the construction process of the prestressed concrete continuous rigid frame bridge,due to certain differences between the model parameters and the actual engineering,plus the errors in the field construction measurement,all of these may lead to the deviation of actual bridge alignment and internal force and design.Therefore,it is usually necessary to test and analyze the main materials and design parameters affecting bridge construction at the construction site,monitor the line shape and internal force on the site,and timely detect and adjust the possible deviation in the construction process,so as to ensure that the line shape and internal force of the bridge meet the relevant technical specifications.In this paper,the prestressed concrete continuous rigid frame bridge with a span combination of 68+120+68m of DWH bridge is taken as the engineering background.Firstly,the influencing factors in the construction monitoring process are analyzed,such as beam structure parameters,temperature field and concrete material properties.Secondly,considering the actual construction of the material characteristic parameters such as load,temperature load and hanging basket with theoretical model may be larger differences,through monitoring and testing,constant correction parameters,the calculation model is more close to the real bridge,so as to adjust the monitoring instruction,minimize the error influence,make the actual bridge deformation and internal force calculation model further trend;Thirdly,the deflection adjustment method in the construction control process and the calculation method of the theoretical model elevation are studied,and the influence law of the line shape with temperature,prestress loss,material bulk density and other factors is found,and the error of the calculation model is analyzed and corrected by the grey system theory.The results of linear control show that the above method is effective in supporting bridge linear control.Finally,the method of stress detection and control in the construction process is studied.The actual test results show that the concrete stress values in the actual construction of the bridge all meet the requirements of the design specification,and the structure is in a safe state of stress.The principles of construction control method and system structure studied in this paper have accumulated useful experience for the development of similar projects in the future,so as to adapt to the construction control technical requirements of this type of bridge.