Study On The Construction Control Of Long-span PC Porous Continuous Rigid Frame Bridge

Along with the augment of bridge span and the development of bridge construction technique , construction control of long span bridge became more vital in design and construction ,which takes more attention . The paper takes the Shi He Dao large bridge on Xin Xing Road in Gong Yi city an object of the study of the construction control techniques for long-span PC porous continuous rigid frame bridge .The paper makes backs up the analysis method to the true thing analysis method carry on the detailed analysis comparison, carries on the detailed elaboration to its good and bad points and the computational process, through two method's comparisons, obtains the true thing analysis method mentality to be clear, has the inversion analytic method and the inversion analytic method and the true thing analytic method union application and so on method more practical merits, and the precision satisfies in the article the continuous rigid frame bridge's construction control request, definite this article computational method for true thing analytic method.The paper introduces each bridge construction control method, the split-ring control method, the closed loop control method, afterward the control method, the forecast control method, the auto-adapted control method, the biggest latitude law and so on. Introduced in detail in the forecast control method's Grey System Theory, elaborated the Grey System Theory principle and the grey model establishment method, and explains with examples the Grey System Theory in it in the bridge monitoring application method.The paper establishes the Shi He Dao large bridge construction process simulation anatomic model using MIDAS/CIVIL, calculates each construction stage control cross section the stress theoretical value and each construction block section throws the high value in advance, carries on the short-term condition and the lasting condition to the bridge makes the stress checking calculation. Through the analysis computation, provides the gross data for the bridge construction control, to calculates the analytical data and the measured data carries on the contrastive analysis, summarizes distorts, the stress rule, the instruction construction carries on safely.The PC porous continual rigid frame construction linear control is the bracket construction important task, the amount of deflection control level the immediate influence closing up precision, is also guaranteed that the bridge linear conforms to the design requirements decisive work. This article embarks actually from the project, analyzes to the PC porous continual rigid frame bridge pre-crown's computation and forecast that the control method aspect has done the deep research, considered reasonably each kind of factor, proposed the formwork erection elevation's definite method, provides reasonably throws the high value instruction construction in advance, thus completes to the actual project construction control. Through to Shi He Dao large bridge's actual control, has made the good progress, thus has confirmed the method accuracy and the feasibility.Through the bridge's control , we obtained the beneficial experience and the lesson. In this article some practical achievement, provides the construction control method which for the later similar bridge's construction may use for reference.