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1 引言倒虹吸工程是输水渠道通过山谷、河流、洼地、道路或其它渠道的压力输水管道,是按照河道、渠道底部高程和水位高程关系确定的,做渡槽或填方渠道及涵洞均不能满足洪水渲泄或有碍船只、车辆通行时所修建的一种渠道交叉建筑物。具有工程量少、施工方便、节约劳动力和三材、造价低、可以工厂化生产等优点。倒虹吸工程主要由进口段、管身段和出口段三部分组成,而管身段结构型式的优劣直接影响着整个工程的投资,对保证工程预期效益的发挥起着重要的作用。因此,管身结构
1 Introduction Inverted siphon project is the pressure water delivery pipelines through valleys, rivers, depressions, roads or other channels, is determined according to the elevation of the channel, bottom of the channel and the elevation of the water level, can not do the aqueduct or filling channel and culvert To meet the flood excuse or impede the vessels, vehicles built by the passage of a cross-channel structures. With a small amount of construction, construction convenience, saving labor and three materials, low cost, factory production and so on. Inverted siphon project is mainly composed of the import section, the tube body section and the export section composed of three parts, and the structure of the tube section of the merits of a direct impact on the overall project investment, to ensure the expected benefits of the project play an important role. Therefore, the body structure