High Piers Multi-span Rigid Frame Continuous Composite Girder Bridge Construction Control Research And Applieation

With the development of transport and the western development of in-depth, continuous rigid frame, continuous girder bridges have appeared, but due to some special terrain of the western limit, the construction of a continuous beam bridge, continuous rigid frame bridge can not meet the requirements,Based on this situation, the rigid frame continuous composite girder bridge came into being on the basis of the respective advantages of the combination of the former two kinds of bridge.Rigid frame continuous composite girder bridge is generally in the main pier to pier and beam consolidation, vice pier using the bearing. The characteristics of this structure both increase the length in bridge applications and can adapt to the limit of short pier bridge environment. In terms of force structure, the use of performance Combines the advantages of a continuous beam bridge and continuous rigid frame bridge and give up their shortcomings, reflecting it has certain advantages.In this paper, to review at home and abroad of the bridge’s history of development and summary of the development experience of the construction control technology, relying on Aizhai rigid frame continuous composite girder bridge engineering background, to analyze the main factors for the bridge alignment and stress, Establish the Bridge BRanalysis and Midas space beam element model, combined with the practice of construction monitoring to analyze the entire construction process. Specific activities include the following:1. Simplicity in this article introduces the basic theory of continuous rigid frame bridge construction monitoring and control methods, a summary analysis of factors affecting the control of construction.2. According to Aizhai rigid frame bridge with high piers, multi-span rigid frame of the characteristics of continuous composite girder bridge construction to control the theoretical calculations, combined with the bridge in the cantilever construction process in the main beam deformation characteristics of a large, analysis of the main beam in the pouring, the tension(not) due to shrinkage and creep and typical operating conditions the variation of deflection and stress.3.To combine Aizhai rigid frame bridge the actual situation, the alternative two closure program by line analysis, on the basis of comprehensive consideration of the construction period, construction costs, Bridge Line and stress and other factors, obtained for the bridge closure the best solution to conclusions. 4.Cast segments of different length, to discuss the cast segment length of the Bridge alignment and stress effects, and the corresponding conclusions, and provide a theoretical basis for the subsequent practice.5.From a security point of view, Research the temporary consolidation dismantle time is necessary.this article Aizhai the rigid frame bridge Pier temporary consolidation dismantle the time to do a specific analysis,obtained the temporary consolidation for the bridge demolition program.6. Taking into account the importance of the construction of the closure section,From Determine Closure Segment the minimum cross-section of the force frame,the non-design temperature closure, closure weight method to do research, and relying on project examples demonstrate "the superiority of displacement weight method".7.Using the total least squares method to identify of the density of concrete parameters determine the estimated value of each parameter, to seek a more reasonable intermediate state as a bridge in the state of the pure ideal and reality.