In-service Bridge Deck Jacking and Deviation Correction Technology and Reset Scheme
During the operation period,the upper and lower structure and support of the bridge often appear offset,and the causes of the offset are different.Nowadays,PLC synchronous jacking technology is widely used in bridge deviation correction engineering.The No.3 bridge in Meilong Expressway in Guangdong Province as an example,the longitudinal slip degree of the superstructure was determined by analyzing its expansion joint spacing,beam end spacing and pier perpendicularity,etc.After analyzing the unadjusted beam bottom support and the large longitudinal slope of the bridge as the cause of the slip,the effect of bridge deck topside push-back on the pier was less than that of the topside push-back scheme of the cover beam.By comparison,the measures of bridge deck push-back,beam bottom support leveling and installation of anti-slip device are adopted to correct the bridge deviation.the bridge does not slip again since completion of the project.
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