The Research On The Construction Control And Key Technology Of The Prestressed Concrete Continuous Beam Bridge

The process of system transformation which transfers the static structure into thehyperstatic structure is existed in the construction process of continuous beam usingcantilever concreting method,the structure produces complex changing of the innerforce and the displacement as the construction goes on,it is important to monitor andcontrol its construction.A three-span continuous beam on soft foundation will producedisplacement,deformation and internal force redistribution,causing by unevensettlement of the foundation.If no special calculation analysis was done inadvance,the linear will be irregular and even go beyond the design requirement.Atpresent,the studies of the uneven settlement on soft foundation are mostly about theprocessing method of the foundation and the substructure,very little about thesuperstructure,thus,taking An Xiang He bridge on soft foundation as an example,itssuperstructure is analysed in this thesis.The main work is as follows:（1）the history and the development of the prestressed concrete continuousbeam bridge is introduced systematically,its significance and research status isintroduced,the significance of the study on the influence that uneven settlement workson the additional inner force of continuous beam is put forward. Under thebackground of An Xiang He bridge,the simulation analysis of the inner force and thedeflection is done to analyse the stress value and deflection value of the top andbottom plate in the key conditions.Combining with the construction control results ofAn Xiang He bridge,comparing the actual stress and deflection value to the theoreticalones of the key sections in the construction,the results show that the actual valuebasically tallies with the theoretical ones,the scheme of error adjustment is putforward.（2）temperature stress of the casting of key zero block is analysed,the structuremodel of zero block is built, the temperature changing progress and the distributionrules of temperature field when casting caused by the hydration heat is concluded,better construction control measures is raised.（3）the additional inner force caused by the uneven settlement of a three-spancontinuous beam is studied through combination of different foundationsettlement;Analysing the inner force and displacement under different settlementcombination of An Xiang He bridge,and comparing with the same bridge which is not on the soft foundation,to analyse the worst combination,proposals are put forward.（4）combined with examples, temporary pier foundation caused by unevensettlement of the boundary cross fold problem analysis, some three edge across foldscheme of the three schemes simulation analysis, through comparing with the results,summarizes the most reasonable fold scheme, and puts forward some Suggestions.