Study On The Construction Control Of Large-span Prestressed Continuous Girder Bridge

Chinese high-speed railway industry developed rapidly in the past 10 years,several new worldwide records and achieved remarkable achievements were set.When a high-speed railway encounters a large span obstacle,the continuous girder bridge is often the first choice.Continuous bridge has several advantages,such as small deformation,few expansion joints,comfortable driving experience,convenience for maintenance,good earthquake-resistant ability,etc.Therefore,prestressed concrete continuous girder bridges are widely used.The large-span continuous girder bridges were usually constructed by cantilever casting method.There are lots of process and stages in construction procedure,these stages influence each other,therefore,it is necessary to carry out construction control measures during construction period,so as to ensure the bridge linearity and stress state meets the design requirements.In this thesis,the construction monitoring of a prestressed concrete continuous girder bridge(48+80+48)m crossing national highway is taken as the engineering background.The general situation of this bridge is introduced,and the design document is rechecked.Based on the deviation of the pre-buried prestressed duct,its effection on the linearity and stress of the main bridge is researched in this thesis,and the corresponding solution to each problem is proposed.The control work of bridge alignment and stress in the construction procedure is introduced in this thesis,furthermore,the theoretical and measured values are compared.Through the above analyses,several valuable conclusions are obtained,which provides some references for such engineering researches.