Design and Construction of a Double-leg Rib Arch Bridge

The technical standard, the general arrangement and the design of the bridge are introduced briefly. Then the construction technology of the bridge is illustrated. Trestleworks are used for transporting and lifting of the segments in side-span area and the steel part of arch seat. A large-span cable crane with its hoisting capability 400t, combined with the cable-stayed cantilever assembly system, is adopted for erection of the mid-span segments. The design and erection of the cable crane, hoisting and matching of the rib, synchronous installation of the upper rib and the lower rib, closure of the rib, and installation of the girder are presented in the paper.

The innovative cable crane brings great convenient and economic benefits; The Flexible connection technology guarantees the relative lineshape and inner force of the double-leg arch ribs; Suitable method of closure is helpful to the realization of the reasonable as-built state of the bridge.