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缓和曲线,可以是辐射螺旋线(简称螺线),三次抛物线(简称三次线),多圓弧曲线。铁路线路采用辐射螺旋线,它的曲率,以始点为零,逐漸变化(呈直线变化),到终点(K_nK)时等于圓曲线的曲率,以滿足线路工作条件对缓和曲线的要求。可是,以我们对××线二十个曲线历年观察和积累的资料来看,某些缓和曲线的运营状况,还存在一定的问題,主要是: 1. 轨道检查车的振动和搖晃曲线,在缓线部分振幅偏大,而车过后检查轨距、水平,却未发现不合格处。 2. 同样的线路条件下,缓线区段的轨道
Mitigation curve, which can be radiation spiral (referred to spiral), three parabolas (referred to as the third line), multi-arc curve. The railway line uses a radiation spiral, whose curvature starts from zero and gradually changes (changes linearly) until the end point (K_nK) equals to the curvature of a circular curve, so as to meet the requirements of the curve for the working condition of the line. However, taking into account the data we have observed and accumulated over the past 20 years of the XX line, there are still some problems with the operation of certain easement curves. The main ones are: 1. Vibration and roll curves of orbital inspection vehicles. Slow-line part of the amplitude is too large, and after the car check gauge, level, but failed to find the place. 2. The same line conditions, the slow line section of the track