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原有曲线之偏角为α_1,切线长T_1,半径R;m、p查表均为已知。欲使线路改变方向通过A点,且保持原有曲线部分不动。量得A点距原直线垂直距离CA长为d,垂足C距原曲线终点KK_1距离为ι,如图1。由图1知,新曲线偏角α2=α_2=α_1+β,切线长T_2=T_1+T,曲线始点HK保持不动。因此只需求出β角后即可得T_2、K_2等资料,由T_2求出T就可得出交点By_2,即可测出新曲线。
The original curve of the declination α_1 tangent length T_1, radius R; m, p table are known. To change the direction of the line through the A point, and keep the original part of the curve does not move. Measure the distance A from the original vertical distance CA is d, foot C from the original end of the curve KK_1 distance ι, as shown in Figure 1. As can be seen from Fig. 1, the angle of the new curve α2 = α_2 = α_1 + β and the tangent length T_2 = T_1 + T, the starting point of the curve HK remains unchanged. Therefore, only after obtaining the beta angle, T 2 and K 2 can be obtained. T 2 can be obtained from T 2 to obtain the intersection point By_2, thus a new curve can be obtained.