First, the safety regulations
1. Special maintenance measures must be prepared for the repair and repair work of various Under Roof Roof Supports and submitted to the technical mine manager for approval.
2. The height of various Underground Roof Supports in coal mines shall not be lower than the relevant provisions of the “Safety Regulations for Coal Mines”. The support shall be in good condition and shall be repaired if the above requirements are not met.
3. When repairing the old Underground Roof Support, it must first check the gas and ventilation. The concentration of each gas can meet the requirements of the “Safety Regulations for Coal Mines” before operation.
4. Pay attention to the passing vehicles when carrying out the Underground Roof Support work in the roadway with vehicles.
5. When performing the Underground Roof Support work in the roadway with overhead lines, first cut off the power of the overhead line, hang the power-off card, and connect the temporary grounding line before starting the lane repair work.
6. When repairing and replacing the Under Roof Roof Support, the location should be reinforced in advance, with a reliable and safe length of not less than 8 meters.
7. When replacing the Under Roof Roof Support, the new Underground Roof Support support strength must not be lower than the strength of the original Under Roof Roof Support.
