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The main bridge of Pingnan Third Bridge is a half-through concrete-filled steel tubular (CFST) arch bridge with a span of 575 m, and it is the largest-span arch bridge worldwide. Several innovative technologies were proposed and adopted with respect to the design, construction and management of Pingnan Third Bridge, including: (1) integrated design and prefabricated construction technologies based on the independent cantilever unit concept to accelerate the assembly of the steel truss for the main arch; (2) a BeiDou Navigation Satellite System (BDS) based active force control and displacement adjustment technology for the construction tower and a force optimization model for the one-time tensioning of buckled cables; (3) the vacuum-assisted filling technique integrated with an advanced timed expansion and shrinkage compensation technology that generally solved the historically stubborn defect of in-tube concrete de-bonding and voiding in the CFST arch bridge industry; (4) a novel composite bridge foundation of the diaphragm wall encapsulating a grouting-reinforced pebble layer for the northern abutment of the Pingnan Third Bridge; and (5) a new management paradigm integrating informatization and intelligent technology to promote the construction management efficiency of the large-span bridge. These proposed innovative technologies can serve as good references for the construction of similar large bridges in the future.

Innovations in Design, Construction, and Management of Pingnan Third Bridge—The Largest-Span Arch Bridge in the World