我国混凝土拱桥应用现状与展望

收集到我国跨径不小于100 m的混凝土拱桥共计313座(截至2020年11月).对混凝土拱桥的应用概况、桥型、结构参数和施工方法等进行分析,并与2007年的统计资料进行对比.结果表明,2007年以来,我国混凝土拱桥的修建数量不断增多,跨径不断增大;西南地区应用较多;以公路桥应用为主,铁路桥的应用不断增加;上承式无铰拱所占比重增大,轻型拱已无修建;主拱混凝土强度持续增高;施工方法增多,但仍以悬臂拼装法为主,跨径大于250 m以上时,则以埋置拱架法(Melan法)为主.今后在混凝土拱桥新材料、新结构、新工艺上还应不断创新,使其更好地服务于我国社会经济发展.

Application and Prospects of Concrete Arch Bridges in China

Up to November 2020, data of 313 concrete arch bridges with a span no less than 100 m were collected, of which 303 have been completed and 10 are under construction. The applications (bridge number, spans, regional and industry distribution, etc.), bridge structural types, structural parameters (section forms, geometric dimensions, and main arch materials, etc.) and construction methods are summarized and compared with statistics data in 2007. The analysis results show that the increasing trend of both number and span for the construction of concrete arch bridges in China is continued since 2007. In terms of regional and industrial distribution, the main application area is the southwest region, the main application body are highway bridge, while the application in railway is growing up. Regarding the bridge structural types, the proportion of deck arch bridge was increased, no new light arch bridges was built; material strength of main arch was constantly improving. More construction methods were used, but the cantilever assembly method was still the main method, while for the bridge with a span longer than 250 m, the embedded CFST scaffolding method was the domain one. Continuous innovation in new materials, new structures, and new technologies is necessary for concrete arch bridges to make them better service for China''s social and economic development.