Research Of Construction Techniques Of Jiajiang Bridge

Prestressed concrete continuous rigid frame bridge is one kind of highway long-span bridges in common use .Rich experience has been achieved in project construction .But it's still a technical problem to be studied that how to take suitable construction technique and methods to guarantee construction quality with bridge construction condition.Take Lu'anzhou Jiajing Bridge for example,a deep study of such construction technique was made.The foundation of Jiajiang bridge is designed as combined structure of bored piles and pile caps.From the study of supper-long diameter and supper-depth bored pile construction, this paper sums up the concept such as stressing basic stratum conditions, chosing suitable drilling machine, selecting feasible drilling methods and taking effective protecting measures to guarantee quality.Large bearing platform above the water is one of difficult points in the construction of Jiajiang bridge. Combining environmental conditions and design requirement, this paper studies single-wall hanging box taken in the construction of bearing platform above the water, especially structure design of hanging box, nstalling methods and key technical measures. Also, shortages and virtues are analysed and summarized.Balanced cantilever construction is used in prestressed concrete box girder. The segment No.0 concrete construction, temporary fixed construction methods and closure concrete construction ways are studied in details. Furthermore, the new methods of erecting pretressed grouting is dissussed.The results of studying provide valuable technical reference to the construction of the similar bridges.