Research On Construction Technology Of High Pier And Long Span Prestressed Concrete Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge with its construction is simple,cost economy,accept reasonable,driving comfort and other unique advantages.In recent years,the field of bridge construction has been rapid rise.In the main span of 100-300 m has almost become the preferred type of designer.But in the prestressed concrete cantilever construction of continuous rigid frame bridge,linear has been pouring girder section is not adjustable in the later construction,in order to ensure the successful closure of the bridge alignment and bridge meet the design requirements,and internal force of the bridge after control in the design of the allowable range,the construction must be in control in the process of bridge construction.Therefore,it is very necessary to study the construction technology of the prestressed concrete continuous rigid frame bridge.In this paper,the Erlang River Bridge as the construction example,this paper focuses on the high pier and long-span continuous rigid frame bridge with heavy and difficult technical problems in the construction process,and conducted in-depth summary.The main research method of this paper is to study the construction process of the bridge by field test and finite element numerical simulation analysis:(1)The mold of thin walled high pier and outsourcing lifting frame construction technology,method of total station with high precision laser alignment and the combination of high pier template positioning,and through data analysis,using the two methods of mutual check,ensure the verticality of high pier construction.(2)With the aid of CIVIL MIDAS 2010 finite element calculation software,the integral modeling and analysis of the pier beam temporary consolidation,the 0# block bracket and the hanging basket construction are carried out,which ensures the comprehensive,reasonable and reliable stress calculation.(3)Using MIDAS CIVIL 2010 finite element software modeling calculation of full bridge piers and box girder stress,theoretical analysis of bridge construction stage stress,and field test data comparison,theoretical analysis and monitoring data of double control,to ensure the safety of the structure,linear control.(4)Optimization of multi span continuous rigid frame bridge closure order,the first cross,then finally side span and side span closure order,one hand to solve the influence of unbalanced side span cantilever segments,on the other hand,speed up the construction progress on the box girder.The research of this paper is of great practical significance.Based on the analysis,some construction control measures of high pier and long span continuous rigid frame bridge are proposed,which can provide theoretical basis for future construction.