The paper deduces the calculation formula of parallel sidelines of spiral curve, and proves two characters of parallels sidelines. It can be applied to instruct actual setting-out work.
2
从分析实用等距曲线的构成入手，推导出了实用三弧段等距型面的大圆弧半径计算公式和型面曲线的数学模型。
Based on analyzing the structure of practicable isometric profile, the radius calculating formula of bigger arc and the mathematical model of practicable isometric-trilateral profile are reduced.
The mechanical calculation of ADSS fiber optic cable is introduced and the calculation formulae for sag, tension, strain and slack length etc are given.
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