New Asynchronous-Pouring Rapid-Construction Method for Long-Span Prestressed Concrete Box Girder Bridges with Corrugated Steel Webs

Abstract

Based on the traditional hanging basket cantilever construction of the prestressed concrete box girders, combined with the excellent shear capacity of the corrugated steel webs (CSWs), this paper introduces an improved cantilever construction method for long-span prestressed concrete (PC) girder bridges with CSWs, which is called the asynchronous-pouring rapid-construction (APRC). A remarkable change is that it uses the CSWs themselves as the main load-bearing members for supporting the hanging basket and girder segments. The equilibrium state of the new hanging basket system in the APRC method is optimized from the cantilever to a simply supported condition. Additionally, the dislocation construction of the top flange, bottom flange, and CSWs on three adjacent segments is accomplished simultaneously. Therefore, the construction efficiency is greatly improved because the number of construction platforms is increased to three compared with the single platform of the traditional hanging basket cantilever construction. In addition, it realizes the asynchronous pouring of the top and bottom concrete flanges in the same segment so that the pouring concrete has sufficient time to reach the required strength. Finally, by considering the longest prestressed concrete girder with CSWs in China, the whole construction process of the Fenghua River Bridge using the APRC method is systematically introduced.