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Hunan approach spans of a bridge for the study. The bridge opening cross-layout for 3x30m, height of prestressed concrete continuous box girder, upper structure concrete strength class C50, stand by in-situ concrete construction.

Take Hunan some bridge approach span as object of study.Should direct the bridge opening cross arrangement for 3×30m, uses and so on highly prestressed concrete continual box Liang, superstructure concrete intensity rank C50, uses the support law cast-in-place construction.

elevated roadways in the Honam a bridge as the object of study. The elevated roadways cross-arranged holes for 3 ×30 m high, used Prestressed Concrete continuous box beam strength of concrete structure, the upper grades, using stent C 50 superstructure construction law.

Hunan approach spans of a bridge for the study. The bridge opening cross-layout for 3x30m, height of prestressed concrete continuous box girder, upper structure concrete strength class C50, stand by in-situ concrete construction.