Research On Construction Monitoring Technology For Large-span Cluster Anchor Cable-stayed Bridge

Construction monitoring is a key technical link connecting bridge design and construction.Its main task is to effectively monitor and control the line shape and stress during the construction of the bridge to ensure that the deformation and internal force of the bridge structure are always at a safe,Within the controllable range,and the structure of the bridge is linear and the force meets the design requirements.This article takes the Chizhou Yangtze River Highway Bridge as the engineering background and relies on the construction monitoring work of the bridge to study the construction monitoring technology of the bridge based on its asymmetric and aggregate anchoring features:1.The development of anchorage forms for cable stayed bridges of hybrid beam cable-stayed bridges and long-span cable-stayed bridges is summarized,and the current status of construction control research for cable-stayed bridges is introduced.2.The theories and methods included in the geometric control of hybrid cable-stayed bridges are introduced,including the theoretical basis of the geometric control method,geometric control calculation methods such as the determination of the reasonable bridge formation status of the cable-stayed bridge,and geometric control implementation methods such as the mid-span closing method.3.A simulation analysis of the construction stage of the Chizhou Yangtze River Highway Bridge was carried out.The stress-free configuration of the main beam and the stress-free length of the stay cable were determined.Through the structural parameter sensitivity analysis,the structural parameters that had a greater impact on construction control were determined.Provide data basis for manufacturing stage control and installation stage control.4.A detailed mechanical analysis of each component of the anchorage zone of the pylon during the construction phase was carried out by numerical simulation.The mechanism of the concentrated anchor shear force transmission was studied to ensure the safety of the pylon during the construction phase.5.Based on the geometric control method,combined with the on-site construction technology of the Chizhou Yangtze River Highway Bridge,the specific implementation process of the bridge construction monitoring is introduced in detail,and the implementation results of the construction monitoring are evaluated.The research results show that the anchoring form of the concentrated anchor tower in the Chizhou Yangtze River Highway Bridge has good safety,and the geometric control method is a scientific and effective construction control method.It has achieved good implementation results when applied to the Chizhou Yangtze River Highway Bridge.