Jacking Construction Technology for the South Approach Bridge of Oujiang River North Estuary Bridge
Bridge jacking technology as an effective means of bridge deflection correction is widely used in bridge alignment adjustment.Based on the actual engineering situation of the first link of the south approach bridge of Oujiang River North Estuary Bridge,this paper analyzes the difficulties of the jacking construction of the bridge project and establishes a suitable bridge jacking construction program accordingly.Theoretical calculations and on-site measurements combined with the method of effective monitoring and analysis of the displacement and stress of the box girder in the jacking process are used,the results show that:The construction program is a good guide to the jacking construction.The measured jacking height of each part of box girder of the first link of the south approach bridge is deviated less than 10%from the designed jacking height.In jacking process,the upper edge of the girder at the support of No.S02 and No.S03 piers is tensile and does not exceed the tensile strength of concrete,which is in line with the theoretical trend.The change rule of box girder stress at bearing section coincides with the change rule of jacking height.
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