芜湖中山桥改建工程方案设计

原芜湖中山桥为跨度63 m的下承式混凝土系杆拱桥,由于航道升级,需进行改建。该改建工程面临与城市道路衔接的问题,为解决该问题,提出了北侧布置环形道路的桥梁方案、全隧道方案、中二街布置T形交叉桥梁方案,对3种方案进行综合比选,推荐采用T形交叉桥梁的总体方案。该方案主桥采用带副弦的梁拱组合钢结构,跨径布置为(28+90+28)m,主梁采用梁高低矮的双边箱结构,系梁梁高0.9 m,引桥中二街交叉口采用T形平面钢板梁结构,梁高0.8 m。主桥上部结构采用岸上组拼、水中浮运的方案施工,引桥上部结构采用分段预制、逐段吊装的方案施工。中山桥改建工程建设速度快,对航道、城市环境的影响小,改建后的中山桥已成为芜湖中心城区新的标志性建筑。

Renovation Design for Zhongshan Bridge in Wuhu

The original structure of Zhongshan Bridge in Wuhu was a concrete tied arch bridge that spans 63 m.Due to the upgrading of navigation channel,the bridge faced a renovation.The connection of the renovated structure to the existing road accesses was a great challenge of the project.To address this issue,three connection solutions were proposed,including building circular road on the north side,full-tunnel connection and building T-shaped viaduct in the Zhonger Road.By comparison,the T-shaped viaduct solution was finally selected.The main bridge was renovated to be a combined steel girder and arch structure with three spans of 28,90 and 28 m,which features its subsidiary arch chords.The main girder consists of two lateral boxes and the connection slabs,with shallow depth of 0.9 m.The T-shaped viaduct in the intersection of Zhonger Road is a steel plate girder structure,measuring 0.8 m in depth.The girder elements of the main bridge were first assembled on the banks and then floated to site.The girder elements of the approach bridge were prefabricated to sections and hoisted section by section at the bridge site.The renovation of Zhongshan Bridge was carried out at a fast pace,which brought minimal disruption to the navigation channel and urban environment.The Zhongshan Bridge after renovation has been a new signature of Wuhu′s central urban area.