4) a day before the knock should clean the support structure, the article material on the support structure neatly stacked, in any case, is prohibited and dropped from the support structure materials and articles dumping.
4) The support structure should be cleaned before the daily work, the material items on the support structure shall be stacked neatly, and in any case it is strictly prohibited to throw material items and dump garbage down from the support structure.
4) The support structure shall be cleaned before the end of work every day, and the materials and articles on the support structure shall be stacked in order. In any case, it is forbidden to throw materials and articles and dump garbage from the support structure downward.