When erecting the outer steel pipe frame, the plan shall be erected, and the construction personnel shall be clarified in words. It is strictly forbidden to throw materials when working at high places
The outer steel pipe frame should be set up when setting up the scheme, the construction personnel to use the text to cross the bottom. It is strictly forbidden to throw material when working at high places
When the outer steel pipe frame is erected, the erection scheme shall be set up, and the construction personnel shall be disclosed in words. It is forbidden to throw materials when working at height<br>