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在复线設計的过程中,第二线平面的計算,习慣上一直沿用角图的方法,尤其在复杂的改建計算中,几乎視为唯一可能的方法。角图法的优点在于有一整套完善的計算程序,但角图法也有相当大的缺点。如計算过程复杂、麻煩,且存在一定的誤差。按照角图的性質,其誤差与线距加寬度及线路轉角的平方成正比,所以在线距加寬度及轉角超过一定限度的情况下,角图法是不宜应用的。在实际设计工作中,經常碰到这种情况,但不知应該採用何种計算方法較为适当。过去,除了角图法外;没有其它較完善的理論和整套計算程序的方法。三
In the process of double-track design, the calculation of the second-line plane has traditionally used the method of angle maps, especially in complex reconstruction calculations, and it is almost regarded as the only possible method. The merit of the corner diagram method lies in a complete set of calculation programs, but the corner diagram method also has considerable disadvantages. If the calculation process is complicated and cumbersome, there is a certain amount of error. According to the nature of the angle diagram, the error is proportional to the line width plus the square of the line angle. Therefore, the angle map method is not suitable when the line width plus the rotation angle exceed a certain limit. In the actual design work, this situation is often encountered, but I do not know what kind of calculation method should be more appropriate. In the past, there were no other well-established theories and a complete set of computational procedures other than the angular graph method. three