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由于抢道线的等半径画法不符合国际田联关于“对于每一名运动员选取的所允许的最短路线是一致的,并且不少于规定距离”的要求,故此方法已不再使用。取而代之的是“渐开弧线画法”。切入差的计算方法也随之改变。一、抢道线的渐开弧线画法(以400米半圆式田径场为例)第一种方法(直接画法):1.从第三直曲段分界线与第1道测量线(亦称计算线或实跑线)的交点(以下称“交点A”)起向前在第1道弯道测量线上固定一组大头针。大头针露出地面1.5厘米左右,相邻两颗大头针之间的距离约10厘米,交点A至最远的一颗大头针的弧线距离不少于4.20米(适用于弯道半径为36.50米的场地。其他半圆式田径场地应适当调整该距离。其调整的
The method is no longer used because the equal-radius drawing of the lane line does not comply with IAAF requirements that “the shortest route allowed by each athlete is consistent and not less than the specified distance” . Instead, “involute arc painting ”. The method of calculating the difference between cuts also changes. First, grab the line of involute curve painting method (400 meters semicircular track and field as an example) The first method (direct painting method): 1. From the third straight section of the boundary line and the first measurement line Also known as the calculation of the line or the actual running line) of the intersection (hereinafter referred to as the “intersection A ”) to move forward in the first curve to fix a set of pins. The pin exposes about 1.5 centimeters on the ground and the distance between two adjacent pins is about 10 centimeters. The arc distance from the intersection point A to the furthest pin is not less than 4.20 meters (for a site with a curve radius of 36.50 meters. Other semi-circular track and field venue should be properly adjusted the distance