In recent years, several major accidents of construction elevators occurred in the country, which are all caused by this.
For connecting bolts with pre tightening force requirements, torque wrenches or special tools shall be used to accurately tighten the bolts to the specified torque value according to the specified tightening sequence.
When installing the connecting bolts of the standard section, the screw should be at the bottom and the nut should be at the top.
01 description of hidden danger: the connecting bolts of the standard section of the guide rail frame are missing 02 violation of article 4.2.21 of the safety technical specification for installation, use and disassembly of building construction elevators (jgj215-2010).
The missing installation and failure of the connecting bolts of the standard section of the guide rail frame are very likely to cause the failure of the supporting structure of the construction elevator, thus causing the lifting cage to fall off the guide rail frame.
03 the analysis shows that the pre tightening force cannot be reached after the initial installation or the maintenance inspection is not timely and comprehensive after the lifting cage has been operated for a period of time.
Therefore, the connecting bolts of the standard section should be the focus of inspection: (1) the connecting bolts should be complete and fastened; (2) The screw of standard section shall be lower and the nut shall be upper; (3) The standard section bolt is 3 times higher than the top plane of the nut…
The loose and loose preventing parts between the connecting parts and the connecting parts shall comply with the provisions of the operating instructions and shall not be replaced by other objects.
