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建筑施工中,有时会遇到计算圆形混凝土柱子的螺旋钢筋长度和螺旋楼梯钢管长度的问题。在介绍计算方法之前,我们先看一下图1所示的三角形纸带。如果将纸带缠绕在圆棍上(宽的一边先缠上),结果就会如图2那样呈螺旋形。由此不难看出,计算螺旋线的长度,就是计算图1的三角形斜长的问题。可以运用勾股定理解决这一问题,三角形的高就是螺旋
In the construction of a building, sometimes there is the problem of calculating the length of the spiral steel bar of the round concrete column and the length of the spiral staircase steel pipe. Before introducing the calculation method, let us look at the triangular tape shown in Figure 1. If the tape is wrapped around a round stick (when wrapped around the wide side), the result will be a spiral as shown in FIG. It is not difficult to see that calculating the length of a helix is the problem of calculating the length of the triangle in Figure 1. You can use the Pythagorean theorem to solve this problem, the height of the triangle is the spiral