Baseboard cable horizontal arrangement prestress concrete variable cross-section box girder bridge and construction method thereof

The present invention belongs to the field of civil engineering bridge technology, and relates to a baseplate ropes horizontally-arranged prestressed concrete non-uniform box beam bridge. It is characterized by that in the position of midspan baseplate which is correspondent to the beam height in the box beam interior a horizontal anchor plate is set longitudinally, said horizontal anchor plate and box beam baseplate are combined into one body, the thickness of said horizontal anchor plate is identical to that of midspan baseplate, the baseplate ropes are arranged in the horizontal anchor plate interior, and said horizontal anchor plate and box beam can be cast in-situ together. Said invention can raise durability of the bridge and can greatly raise crossing capacity of said bridge.