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长期以来,整体基础的拱涵都是按刚性基础设计的,所以在低、中高度填土情况下,基础的圬工数量很大,另外不论拱顶填土高低、外力大小,均采用同一结构尺寸,在设计上有一定的不足之处。现介绍的板凳式基础拱涵是按弹性基础设计的,由于基础减薄产生了弹性变形而影响拱圈,两者互有影响。按弹性基础设计的板凳式基础拱涵与刚性基础拱涵相比(图1、2),可以节省圬工(约10—50％)和减轻劳动强度,亦可改变刚性基础在不同情况均采用同一结构尺寸的问题。
For a long time, the whole arch base has been designed according to the rigid foundation. Therefore, under the conditions of low and middle filling, the basic masonry quantity is very large. In addition, the same structure is used regardless of the level of the dome filling and the external force Size, there are some shortcomings in the design. The present description of the bench-based arch culvert is designed on the basis of flexibility, due to the basis of thinning have an impact on the elastic deformation arch, the two affect each other. Compared with the rigid foundation arch culvert, the bench-based arch culvert designed according to the elastic foundation can save labor (about 10-50%) and reduce labor intensity, and can also change the rigid foundation in different situations The same structure size of the problem.