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要使涵洞设计得经济合理,关键在于涵洞位置的选定。这一点对于山区路线更显得重要。因为:一方面,山岭区涵洞数量特别多,而且一般都是沟形深狭,填土较高,倘若不加以慎重考虑,一律设于沟底,势必使涵洞造得很长,形成浪费;另一方面,山岭区地形起伏多,路线迂回曲折,特别复杂山岭有形似鸡爪式之地形,倘不考虑归并,每遇起伏间之水沟或凹处即设一涵,也会大大增加涵洞数量而造成浪费。
To make culverts designed economically and reasonably, the key lies in the selection of culvert locations. This is more important for the mountain route. Because: on the one hand, the number of culverts in the mountainous area is particularly large, and generally are ditches and dredgers, which have a high filling level. If they are not carefully considered, they are all set at the ditch floor, which will inevitably cause the culvert to be very long and form a waste. On the one hand, mountainous terrain ups and downs, the circuitous twists and turns, the complex shape of the mountain has the shape of chicken-claw terrain, if not considered merger, every time the gap between the ditch or recess that is a Han, will greatly increase the number of culverts And cause waste.