The Control Method Of Span Pre-Stressed Concrete Bridge

Along with our country science and technology and the transportation enterprise's development, the prestressed concrete continuous bridge is simple by its construction, the construction cost economy, the stress are reasonable, the driving comfortable and so on unique superiority obtained the rapid development in the recent years. At present, the span in the 40-150m scope's bridge, the prestressed concrete continual box beam bridge occupied the dominant position. The continuous bridge span is bigger, its construction's difficulty is also bigger. Regarding the great span prestressed concrete continuous bridge implementation construction process control, is guaranteed that the construction quality and the safe important link, are guaranteed the bridge condition conforms to the design requirements important measure.This article unifies the Shatin Ganjiang River especially big bridge's construction, carries on the control continuously using the feedback control method to the main span Liang's bracket construction process, through to each stage actual level's survey, discovers it with the theoretical value difference, then generalized analysis each influencing factor, thus determines the king post in the next construction stage formwork erection elevation. The construction control result indicated that the utilization feedback control method control bridge elevation, can correct the deviation which promptly in the construction process produces, the effective guarantee bridge structure in the construction process's security, Cheng Qiaohou linear and king post's stress meets the design requirements, this law may apply other similar bridges in the construction control.In the great span prestressed concrete continuous bridge's construction process, the temperature change linear has the tremendous influence to the bridge structure. In the construction along with the king post bracket's elongation, the distortion which the sunshine temperature difference will cause will be getting bigger and bigger, must therefore consider the temperature in the construction control the influence. This article according to box Liang to control the section the actual temperature distribution to carry on the computation analysis to under some specific construction condition temperature effect, the analysis result had indicated that in the greatly cross long association pre-stressed continuous bridge's design and the construction, the temperature change was the very important influencing factor, should bring to the enough attention, besides in one day stable stable time interval survey bridge linear, but must probably consider the king post formwork erection elevation in the construction contro...