小江调水方案跨越汉江建筑物结构形式的研究

针对跨汉江建筑物距地面高、跨度大、过流量大的特点,比较分析了渡槽、桥式倒虹吸和隧洞式倒虹吸3种结构形式的特点：渡槽水头损失小,下部槽墩比较高;隧洞式倒虹吸水头损失比较大;桥式倒虹吸结合了两者的优点,既减少了水头损失,又降低了槽墩.通过对工程量与技术经济性进行比较,最终确定采用桥式倒虹吸的结构形式.

Study and Selection about the Forms of Structures Spanning Hanjiang River in Dispatching Water Project of Xiaojiang River

Three kinds of spanning river structures,such as aqueduct,bridge-type inverted siphon,and tunnel-type inverted siphon,were analyzed and compared with to solve the difficulties of structures spanning Hanjiang River,as longer span,larger traversing flow,and higher height.The results show that,water head of aqueduct loses little,and lower part of aqueduct′s piers is high,tunnel-type inverted siphon was larger head loss,bridge-type inverted siphon integrates with the merits of above both,it has not only smaller water head loss but also lower bridge piers.Finally the structure of bridge-type inverted siphon was adopted based on technical and economic comparison results.