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针对小半径曲线改建中新建曲线中桩坐标不易确定的问题,介绍用全站仪采集既有铁路曲线夹直线四点中线坐标,就可计算出改建曲线的曲线要素及改建线路任意里程中桩坐标的快捷方法,并提出在改建铁路中线不能贯通时,用解析法计算新旧两线线间距也可确定桥涵接长长度的办法;最后分析了某提速改造工程中一涵洞接长长度不足的原因。
Aiming at the problem that the coordinates of the pile in the new curve in the reconstruction of small radius curve can not be easily determined, the curve element of the reconstruction curve and the coordinate of the pile in any mileage of the reconstruction line can be calculated by using the total station to collect the coordinates of the four-point median line of the existing railway curve clamp. And puts forward the way of calculating the length of bridges and culverts by using analytical method to calculate the distance between the old and the new lines when the railway center line can not be rebuilt. Finally, the reasons for the insufficient length of one culvert in a speed - up renovation project are analyzed.