Application Research of Long-span Prestressed Simply Supported Box Girder
In order to improve the construction quality of long-span prestressed simply supported box girder,this paper takes a bridge project in Sichuan as an example,puts forward a new construction scheme for the problems that may occur in the construction process,and carries out deflection and crack detection on the long-span prestressed simply supported box girder after construction.By monitoring the deflection and surface cracks of piers of large-span prestressed simply supported box girder after construction,the distribution range of deflection values of all piers is 2～7 mm,which is within the allowable design value of 15 mm.The crack length of the bridge surface after the construction is3.2～8.6 mm,which is less than the maximum allowable crack value of 10 mm,which meets the deflection deformation requirements specified in the design,which proves that the construction precision and quality of the long-span prestressed simply supported box girder are good.
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