Research On Construction Monitoring Variable Cross-section Continuous Beam

Prestressed concrete continuous bridge spanning capacity is large, the design, construction technology is mature, construction shall not affect the bridge opened to traffic.,therefore has been widely adopted. But the prestressed concrete continuous bridge cantilever construction is difficult, each construction stage the internal force, interference degree change larger,if inappropriate construction prone to major quality accidents. So for prestressed concrete continuous girder bridge construction monitoring, ensure the construction safety in all stages of construction, ensure the smooth operation of the cantilever construction and closed to ensure the construction after the closed linear meet the design requirements, is particularly important.In this paper, based on the actual project, The prestressed concrete continuous beam bridge construction supervision related theory to carry on the research analysis, and combining the theory and engineering practice, so as to guide the construction.In this paper, first of all, Structure analysis of the continuous girder bridge construction monitoring methods: formal analysis, regression analysis method Introduced in briefly, reading a lot of construction monitoring works, to summarized the main factors affecting the construction monitoring, discusses the error adjustment method is commonly used in the construction monitoring.According to the actual situation of the bridge monitoring, formulate the construction monitoring system, puts forward the stress, elevation, temperature monitoring, closed segment elevation difference monitoring methods, principle, ensure the smooth implementation of the bridge construction monitoring.This bridge is precise simulated by a analysis software MIDAS, calculation and analysis, put forward the theory of prestressing camber, section body stress, used to guide the construction. Bridge construction monitoring site measurement is very important to a content and standard of the scene of the immunity, linear, stress, temperature, altitude difference in closed by using the detailed measurement, record, and comparing with the results and the theoretical calculation analysis, according to the results of the analysis of the structure calculation, construction parameters for real-time adjustment, to ensure that the quality of the bridge construction.Theoretical calculation of the stress value and the measured values shows that prestressed steel strand tension effectively; Each section stress measured in addition to the individual data is discrete, the vast majority of are less than the stress limit value, and there are large amount of surplus, remain the state of security structure in the whole construction process. Deflection, the linear and closure segments elevation difference of meet the requirements of the relevant specification. The main bridge linear transition nature, the construction monitoring of desired effect.Through this bridge construction monitoring, monitoring theory was applied to the actual bridge monitoring, real-time guide the construction, so as to realize the smooth closed this bridge.