Research On Construction Control And The Key Question Of High Piers And Long Span Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge, which mainly used symmetrical cantilever construction method, is a quite common bridge style in the mountains area. as the long-span continuous rigid frame bridge structure is concerned,the deformation, the cross-section of the stress and strain state in the construction phase have a direct impact on the bridge's line shape and the finish period of force state. therefore, the construction control on bridge is particularly important.Based on the analysis of the status quo in the current domestic and foreign continuous prestressed concrete rigid frame bridge construction and the summary of the control theory, in allusion to the characteristics of cantilever bridge construction in Yesanhe bridge,combined the bridge construction plan, this paper uses the Finite element program to simulate the real construction, then, gain each control section's internal force and pre-drive up value to establish control stress and line shape documents and institute detailed rules according to characteristics of Yesanhe bridge, analyze simulation results compared with the measured data to guarantee the line shape of the last stage and the internal force to meet the design requirements.During the construction process of Yesanhe bridge, due to the impact of intense burst in the construction of hydropower station, lying in downstream, this bridge has generated many cracks on the beam. We need to know the burst impact on the quality and safety of the bridgein the construction control, therefore, according to the acquisition of vibration parameters in the blasting locale, we establish typical acceleration-history curve in this paper,which reflect the bridge foundation's vibration under the different volum of explosives,then,divided the construction period and the finish period into two phases, set up a finite element analysis model and use comparative analysis method to analyze the history responses of the bridge in different work conditions. This paper provided the basis for the safety, quality in the bridge construction and the rendrock volume of blasting in hydropower station construction, also provide some reference value for the control of similar bridge construction.