九堡大桥组合结构桥梁的技术构思与特色

杭州九堡大桥跨越钱塘江,全长1 855 m,是一座全部采用组合结构的大型越江桥梁工程.主航道桥与非航道引桥分别采用大跨度连续组合拱桥和连续组合箱梁桥,组合拱桥与组合箱梁桥均采用多点同步顶推法施工技术.其中,引桥顶推施工时,85 m跨间无临时墩;主桥顶推施工时,210 m跨间仅设置1座临时墩.该桥的建设方案展现了新的理念、技术以及创新点.

Technical Consideration and Features of Composite Structure Bridges of Jiubao Bridge in Hangzhou

Spanning the Qiantangjiang River, the Jiubao Bridge in Hangzhou totals 1 855 m in length and is a major river-crossing bridge completely used with composite structures. The main shipping channel bridge and the non-navigable span approach bridges of the Bridge respectively make use of the long span continuous composite arch bridges and continuous composite box girder bridges that are all erected by the multi-point and synchro incremental launching construction technique. For the approach bridges, the incremental launching erection is carried out without utilization of the temporary piers in between their 85 m spans while for the main bridge, only one temporary pier is set in between the 210 m span. The construction of the Bridge has exhibited a number of the new concepts, techniques and innovations.