抛物线竖曲线的测设

设计的纵断面抛物线竖曲线,列出一个二元二次方程y=f(x),其中,自变量x为抛物线路面上任一点至抛物线路面始点的水平距离,因变量y为该点上的高程,该方程为实地施工、验收提供了方便。本法标定点位精确,适应当今车辆对高速公路的要求。

Location of Vertical Curve of Parabola

For convenince of the construction and obtaining the good quality of the project, this article presents a duality quadratic equation y = f(x) according to the parabola surface designed by the designer in which the independent variable x is the horizontal distance from a certain point to the starting point on the parabola suriace and the variable y is the high distance. Therefore, this equation is very convenient for the on-the-spot construction. This method is very accurate and important, and it will meet the vehicles' demands for roads at present. Moreover, it provides reliable grounds for scentific research.