界河大型预应力拉杆拱渡槽设计与研究

Design and Study on the Jiehe Large-sized Pre-stressed Tie-arch Aqueduct

界河渡槽是南水北调东线工程胶东地区调水工程中一大型关键性输水工程,渡槽采用了一种新型的渡槽结构形式上承式预应力混凝土拉杆拱结构。其鲜明的结构特性是:①肋拱和预应力混凝土拉杆组合形成自平衡受力体系,对槽墩不产生水平推力;②整体结构紧凑,支撑高度比下承式拉杆拱渡槽低;③不产生一般拱式渡槽的连拱效应,节省加强墩;④槽墩轻巧、施工方便、安全可靠,工程造价低。简要介绍了上承式预应力拉杆拱渡槽支承结构的设计和相关结论。

A new type of structure system-top supported pre-stressed tie-arch aqueduct was used in the design of Jiehe aqueduct, which is a key structure in the Jiaodong Area Water Transfer Project of the eastern route of the North-to-South Water Transfer Project. The characteristics of the structure are： self-balanced system through arch-web and pre-stressed tie-beam and no horizontal force on support piers; compact integer structure and small height than bottom supported arch aqueduct; no continuous arch effect and free of strengthening pier; light pier and convenient for construction; reliable and safe for use and economical for investment. The paper also introduces the design of the top supported pre-stressed tied arch and the main conclusions.