我国第一个试验性24号单开道岔,经过两年多的研究,试制,已于1962年12月铺设完毕并交付运营,该道岔设在某线单线轉复线处,大多数上行客货列车侧向通过,因此提高了侧向过岔速度,进一步发挥复线插入段的作用。这种适应两向高速行车的大号码道岔,轨型为50公斤,平面布置采用两支对称的三次抛物线,侧向设计速度每小时为120公里,全长67.319米。基本参数采用全路第一次大号码道岔技术会议决定值:未被平衡的离心加速度d_o=0.65米/秒~2;其变化率ψ_o=0.5米/秒~3;动能损失ω_o=0.65公里~2/小时~2。主要几何特征如下:道岔实际度工L_p=67.319米;道岔理论长度L_T=59.357米;尖轨长度L_o=15.500米; 辙叉角α=arctg(1/24)==2°22′54.5″; 辙叉角长度n+m=9.195米;辙叉角理论中心前直线段长度K=4.843米,导曲线最小半径 After more than two years of research and trial production, the first experimental 24-turnout switch in China was laid and delivered to operation in December 1962. The turnout is located at a single-lane turn-around line and most of the up-going passenger and freight trains Lateral pass, thus increasing the speed of the lateral crossing, and further play the role of double-insertion section. This large-size turnout adapted to two-way high-speed operation has a rail type of 50 kg and two symmetrical cubic parabolas arranged in a plane with a lateral design speed of 120 km / h and a total length of 67.319 m. The basic parameters of the road using the first large turnout technology conference decision value: Unbalanced centrifugal acceleration d_o = 0.65 m / s ~ 2; the rate of change ψ_o = 0.5 m / s ~ 3; kinetic energy loss ω_o = 0.65 km ~ 2 / hour ~ 2. The main geometric characteristics are as follows: the actual degree of turnout L_p = 67.319 m; the theoretical length of turnout L_T = 59.357 m; the length of sharp track L_o = 15.500 m; the angle of aversion α = arctg (1/24) == 2 ° 22’54.5 "; Frog angle length n + m = 9.195 m; frog angle theory before the straight line length K = 4.843 meters, the minimum radius of the guide curve