(I) General provisions 1. The brackets within 10m of the heading face must be reinforced before being fired. The bracket that collapses or collapses must be repaired first, and then it can be put into the work surface after repair. When repairing the bracket, you must first check the gang, the top, and carry it out from the outside.
2. open up a new level of each coal roadway near the first layer is not exposed, according to the exact location of the heading face to measure the sector from coal, from coal must be in the normal distance 10m (complex geological structure, rock crushing Drilling starts outside the area of ​​20m), the drilling face should be no less than 5m, and the working face gas should be checked frequently. When the rock road meets the coal line or close to the geological fracture zone, it must also check the gas frequently. If there is a large increase in gas or other abnormalities, it is necessary to evacuate the personnel and stop the excavation for treatment.
(II) Roadway Construction 1. When excavating the roadway in a soft coal (rock) layer or a sandy sedimentary stratum, it is necessary to adopt the pre-exploration support or other measures approved by the chief engineer of the mine.
2. When using single-chamber excavation in the coal (rock) layer, safety measures must be taken to prevent disasters such as gas, water, roof and plugging.
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