通常测设圆曲线的方式为极坐标法和中央纵距法,这两种方法都需要利用圆的弦切角和弦长来测设曲线辅助点,在施测时要求仪器精度高。因为,随时需要调整度、分、秒,定位点精度难以保证,且结构层上障碍物多,故放线时占用时间多,误差过大,有柱、墙钢筋的阻挡不易于测角和量距,也不易借线,所以在结构施工放线中均不适用。为了使圆弧线施测做到速度快、准确率高,经过反复研究,多方面对比,制定完善了一种新的测量放线方法——多折线施测方法,其目的就是尽量减少使用经纬仪,消灭观测误差,改用钢尺量测,减少人为计算误差,使放线简单易行。 Usually, the method of measuring the circular curve is the polar coordinate method and the center longitudinal distance method. Both of these methods require the use of the round chord angle and the chord length to measure the auxiliary point of the curve, and require high accuracy of the instrument during measurement. Because, at any time need to adjust the degree, minutes and seconds, the accuracy of the positioning point is difficult to guarantee, and there are many obstacles on the structural layer, so it takes more time to take the line, the error is too large, and the barriers of columns and walls are not easy to measure angle and quantity. Distance is also not easy to borrow, so it is not applicable in the construction construction. In order to make the circular arc test faster and with higher accuracy, after repeated studies and comparisons in various aspects, a new measuring and releasing method, the multi-folded line measuring method, has been formulated and improved. Its purpose is to minimize the use of theodolites. , Eliminate observation errors, use steel ruler measurement, reduce human error, and make the line easy to use.