Research On Construction Techniques Of The Jinqin Passenger Traffic Only Line Shahe River Super-large Bridge

In recent years, more and more large-span bridges have being built to across river and bays along with the large-scale construction of the high-speed railway. Prestressed concrete continuous bridges have large and growing share of bridges on passenger railway line. Meanwhile, construction method of prestressed concrete continuous bridge—the cantilever method has been rapidly developed, many long span prestressed concrete continuous bridges which have been constructed in our country are mostly take this method.Continous has small deformation, large stiffness, anti-seismic capability, a good traffic c ondition and simple maintenance. As we KNow, continous beam is a common structure in our life.Our design is focused on the typical representative of a continuous beam: presterssed con crete continuous beam bridge.At present, the cantilever symmetry construction method has been comparative mature, but the higher demands which are for the method, are set by the high-speed railway's high standards. Taking the construction of Shahe river super-large bridge for example, this paper introduces the construction method of multi-span continuous beam in detail.Firstly, the paper summarizes to the cantilever construction method at home and abroad.Secondly, taking the continuous beam's project background the for example, this paper introduces the construction technology of block 0 and baskets and give the designing ?checking process and linearity observation of temporary buttress.Thirdly, the paper recommends closure technology of three-span continuous beam and gives the solution of the project's closure technology.Lastly, according to the the construction of Shahe river(60+100+60)metre three-span continuous beam, the construction method and the supervision and control technology are introduced, and the paper discusses the importance of the bridge's supervision and control technology. Midas/civil, large software for bridge calculation is applied for simulating the construction of the bridge, and the theoretical value of stress and displacement is get.To the cantilever casting bridge, in order to ensure not only the joining accuracy of the structural and the alignment of the finished bridge, but also the final elevation meeting the design requirement after a period of operation, it is very important to forecast the deflection of superstructure at every construction stage and analysis the construction behavior based on the real-time monitoring values. There are two important contents-structure line shape and structure stress in construction monitoring and controlling of bridge of cantilever construction. They must be put into practise all-round to making construction propitious and reaching the design point.after establishing the analytic model of the bridge,choosing appropriate structure parameters,taking adequate influencing factors into consideration,The construction control of this bridge is realized through construction calculating,monitoring,back coupling and forecasting and the preplanned target is reached at last.According to this project background, the paper introduces the construction technology of the three-span bridges, which are constructed with the cantilever method, and will plays the guiding role for the construction of similar bridges.