The invention provides an
assembly type
saddle-shell-shaped bottom plate continuous
box girder bridge. A construction method of the
assembly type
saddle-shell-shaped bottom plate continuous
box girder bridge includes utilizing a pretensioned prestress concrete
saddle shell plate as a bottom plate of the continuous
box girder bridge and a corrugated steel web plate as a web plate of the continuous box
girder bridge,
casting a prestress concrete top plate of the continuous box
girder bridge sectionally on site, and tensioning anchorage top plate prestress reinforcing ribs in batch to form a novel integral
assembly type continuous box
girder bridge. The preformed pretensioned concrete saddle shell plate is utilized to substitute for a cast flat bottom plate of the concrete box girder bridge, a bottom wood formwork and a support
scaffold are omitted during construction of the concrete box girder bridge, and the box girder bridge can be used as a temporary construction platform, so that construction load of on-site concrete
casting is reduced, and prestress tension anchorage construction process of the lower portion of the continuous box girder bridge is simplified. The novel assembly type saddle-shell-shaped bottom plate continuous box girder bridge has the advantages of high construction speed, no support construction, good
structural integrity, attractive modeling, low manufacturing cost and the like, and is particularly applicable to a
rail transit viaduct with large standard span and long mileage.