Box type baseboard prestress concrete variable cross-section box girder bridge and construction method thereof

The present invention belongs to the technical field of civil engineering bridge, discloses a variable section box base plate prestressed concrete girder bridge. Specifically configured to: improve the girder bridge plate into a rectangular solid box shape the lower edge of the floor box according to a linear visual effect is determined, L / 4 to use other cross-sectional fulcrum section span to L / 4-flat roof box bottom cross-section, disposed cable floor level, L / 4 to L / 8 For anchoring a sectional bottom cable is disposed along a longitudinal horizontal section of the anchor plate, the top and bottom to blend span 3L / 8 a sectional bottom tank. Cantilever Casting hanging basket in Bridge construction method, the horizontal top and bottom box and anchor plate may be cast with the box girder section, a construction phase may be delayed, or cast on the hanger bracket. The present invention has a bridge arch visual effects, the overall structure stiffness, small deflection, strong shear capacity, tendon disposition reasonable to eliminate cross cable CKS downward radial force moment avoided its concurrent disease, may increase Box bridge spanning capability.