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1965年“公路”第1期刊登了李方同志的用求积板求路基横断面挖填面积,该法确能很快的简单的求出挖填面积,但在制作等值曲线时,不仅麻烦,而且不易准确。同时若欲计算不同几何形状及不同比例之图形时,则需另制等值曲线,因此在使用上较局限。为使其扩大使用范围,且一般的简单几何图形均能利用同一求积板较快的求出各图形的面积,因此建议用图形计算法来代替等值曲线,其计算图形如图1。该图形的具体作法如下:1.作 A、E 两条平行线;2.过 A、E 垂线之中点作第三条平行线 C;
In 1965, the first issue of Highway No. 1 published Comrade Li Fang’s use of a quadrature plate to find out the area of roadbed cross-section excavation. This method can indeed find the excavation-fill area quickly and easily. However, when making the contour curve, not only Trouble, but not easy to accurate. At the same time if you want to calculate the different geometric shapes and different proportions of the graphics, you need to be a separate equivalent curve, so the use of more limited. In order to make it expand the use of the range, and the general simple geometry can use the same plate quickly calculate the area of each figure, it is recommended to use the graphical calculation instead of the equivalent curve, the calculation of the graph shown in Figure 1. The specific practices of the graphics are as follows: 1 for A, E two parallel lines; 2 A, E vertical midpoint for the third parallel line C;