Study On The Construction And Control Of Large-span Continuous Rigid Frame Bridge

With following our country transportation enterprise high speed development and the bridge construction technology unceasing progress, the bridge construction turns towards the great span, the high difficulty direction develops. The prestressed concrete continual rigid frame bridge by linear sprightly, the construction technology mature, the spanning ability strong merit occupied the dominant position in the span100yi300m bridge. The great span prestressed concrete continual rigid frame bridge usually uses the symmetrical bracket construction law construction, must experience many complex construction processes, in will hang in the pouring process to receive many factors symmetrically the influences, will cause the structure the actual condition and the theoretical analysis condition deviates. In order to guarantee the bridge construction the security and the construction quality, guarantee continual rigid frame bridge Cheng Qiaohou linear and the structure endogenic force condition and the design match case, enables the continual rigid frame bridge the actual condition to achieve as far as possible the design point the request, the great span prestressed concrete continual rigid frame bridge construction control is essential.This article first to presents the stage natural tunnel river especially big bridge take the Chongqing Wushan as the project background, elaborated the great span prestressed concrete continual rigid frame bridge construction control content and the method, the construction control basic principle and so on, proposed suits this bridge the construction control plan. And utilizes bridge doctor3.03establishment natural tunnel river especially big bridge main span construction process the simulation model, carries on the simulation analysis to its construction process, the effective grasping each construction stage essential section displacement and the stress variation situation, summarizes the king post amount of deflection distortion and the stress variation rule. Has drawn certain beneficial conclusions, accumulated the experience for the similar bridge construction control.Next, this article key has carried on the discussion to in the construction process linear forecast, summarized the linear control general method, the process contrast analysis, uses the adaptive control method control natural tunnel river especially big bridge linear. And carries on the contrast with the actual result, provides the reliable data for the construction control work. And controlled the model function for the same type bridge linear forecast.Finally, this article has made the simple introduction to in the construction process stress monitor. The natural tunnel river especially big bridge selects the stable good stress sensor to carry on the essential cross section the stress surveying work. Through carries on the stress actual value and the theoretical value the contrast analysis, summarizes certain rule, better instruction bridge construction. Accumulated the valuable experience for the similar bridge stress monitor work.