First, it is necessary to check the gas concentration in the wind-stop zone, and confirm that the gas concentration in the wind-flow zone is less than 1% or the carbon dioxide concentration does not exceed 1.5%, and then check the gas concentration in the wind flow within 10 meters of the local fan and its switch. When the temperature is not more than 0.5%, the local ventilator can be manually activated to restore ventilation and power transmission. If the gas concentration exceeds 1% or the carbon dioxide concentration exceeds 1.5% in the air-stop zone, safety measures for removing gas or carbon dioxide must be developed. Eliminate gas or carbon dioxide in the wind zone. The specific measures are: (1) When discharging gas, gas inspectors should check the gas concentration in the mixed air flow of the single head road and the full wind pressure air flow; (2) It is necessary to control the wind flow in the air-stop zone (bundle the rope on the air duct on the exhaust side of the wind turbine, tighten or loosen the rope), so that the airflow discharged from the single-head roadway is mixed with the full-wind pressure airflow. Gas or carbon dioxide concentration shall not exceed 1.5%; (3) When discharging gas, the power supply must be cut off and the personnel should be evacuated in the return air system of the single headway; (4) When discharging gas, it is strictly forbidden to generate circulating wind in the local ventilator. It has been verified that the gas concentration in the whole single-lane roadway does not exceed 1%, the oxygen concentration is not less than 20%, and after 30 minutes of stabilization, the gas does not change before the ventilation and power transmission can be restored.
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What are the safety measures when the single lane is stopped and the ventilation is restored?
When using a local ventilator for single-headway tunneling ventilation, if the local ventilator stops running due to temporary power failure or other reasons, a large amount of gas may accumulate in the single-head roadway. If it is not handled properly, it may cause a gas accident. Therefore, when it is necessary to restore ventilation and power transmission, the following procedures must be followed and necessary safety measures must be taken.