Safety technology for the connection of the hottes

2022-07-29
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Safety technology for the connection between the mixed lifting inclined shaft and the ventilation inclined shaft

1. The connection sequence is located in the A1 coal seam, which is connected from the ventilation inclined shaft to the mixed lifting inclined shaft. The blasting face and the roadway at the penetrated side adopt local ventilation

2. In the process of roadway construction, the gas inspection in the roadway on both sides of the penetration point should be done well. When the gas concentration in the roadway on the penetrated side of the working face and in the return air flow exceeds 1.0%, the work should be stopped immediately, the personnel should be evacuated, and the relevant departments should be notified to find out the causes and deal with them

3. During the tunnel connection, the local ventilator must be managed by a specially assigned person. It is required to measure the air supply local fan and actual air distribution volume of the working face every day

4. The local fan for air supply at the working face and the side to be penetrated must be locked in three ways and two ways. At the same time, the construction unit will arrange a special person to inspect the power supply equipment every day. If power supply problems are found under the promotion of national policies, they should be handled in a timely manner

5. The local fan for air supply shall not be shut down at will. If the power supply or the local fan measures one point at the center of all samples, resulting in power failure and air shutdown, the personnel shall be evacuated immediately. When restoring local fan ventilation, the fan must be started according to the procedures specified in the coal mine safety regulations. After the fan operates for a period of time, the workers can enter the working face to work only when the gas concentration in the roadway is below 1.0% as checked by the gas inspector

6. Due to the current market demand at the downstream of pig iron has not yet fully improved, the air duct must be in place during the excavation of the working face. The air outlet of the air duct shall not be more than 5m away from the working face. No operation without wind or breeze is allowed. Drilling and blasting shall be conducted according to the blasting chart, and the system of "one shot, three inspections" and "three person interlocking blasting" shall be strictly implemented. Before drilling, it is necessary to check the ventilation, gas, side and roof conditions of the working face, misfire, etc. in case of any abnormality, it is forbidden to drill, implement the system of knocking the side and roof, check and handle the temporary support and permanent support, and drill after confirming that it is safe. Before each blasting, the entrances of the two working faces must be guarded by a specially assigned person. Before shooting, a signal (three shouts) must be sent out to set up a warning. Shooting can be carried out only after no one (warning area) is confirmed. At the same time, the warning personnel and the shooter must contact in advance and shall not leave their posts before receiving the evacuation notice. The blast hole shall be filled with water or clay blast mud, and it is strictly prohibited to block it with coal or rock ballast. The blast hole shall be filled with water or clay blast mud, and it is strictly prohibited to block it with coal or rock ballast. Blasting is strictly prohibited for blast holes without sealing mud, with insufficient sealing mud or with inaccurate sealing

7. It is strictly prohibited to carry out empty roof operation. The support of the heading face shall be close to the working face. Temporary support shall be provided for the rest of the cyclic footage and support. For sections with high pressure, support shall be increased

8. Do a good job in the comprehensive dust prevention work in the working face and the roadway at the penetrated side. In particular, each shift at the operation point should carry out serious watering and dust reduction work to effectively control the flying of coal dust and keep the roadway coal moist

9. During the implementation of penetration, when one side of the local fan for air supply stops due to fault, the tunnel penetration shall be stopped immediately, and the penetration can be continued only after the local fan ventilation is restored

10. Before the tunneling tunnel is cut through, when the distance is 20m, the operation of one working face must be stopped, and the preparation for adjusting the ventilation system must be made. During the connection, a specially assigned person must give unified command on the site. The working face where excavation is stopped must maintain normal ventilation and be provided with fences and warning signs

11. Strengthen the gas inspection of the working face. Each shift of the working face shall arrange a full-time gas inspector to inspect the gas of the working point and the roadway on the penetrated side according to the routine. The inspection times of each shift shall not be less than three times

12. Each shift of the tunnel penetration operation site must have a leader to follow the shift to coordinate the relevant work. The principle of long exploration and short excavation shall be followed. The small section shall be connected first, and then the section shall be expanded

13. During construction, operators shall take good care of ventilation facilities to ensure that the air volume of the working face is not affected

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