求翻译：b.吊杆采用6个的元钢，根据弹线中吊杆的位置用可与原有吊杆焊接。并刷两道防锈漆，当顶部的风道或障碍物宽度超过1.2米时，请参照下图，吊杆设置间距不得大于1.2米是什么意思？

B. suspenders with $ 6 steel, based on the elastic-line location can be the suspenders in boom welding and original. Two paint and brush, duct or obstructions be high above in the sky more than 1.2 metres width, please refer to the figure below, pendant set spacing must not be greater than 1.2 m