When the two roadways are head-to-head, there is often a blasting accident, so pay special attention. Article 108 "coal mine safety regulations," states: before heading through the tunnel, mechanized excavation roadway in the first 50 meters away, the other 20 meters away from the roadway in front (Geological Survey staff issued a notice in advance), must stop a face job . Only drilled from the front of a work. The excavation face of the stop work should still maintain normal ventilation, and set up fences and warning signs, and send special personnel to be on alert. The gas is inspected and discharged before the blasting of the roadway. Only when the gas concentration of both working faces is below 1%, can it be blasted. Before blasting, it is necessary to strengthen the brackets in the through area to prevent the collapse of the shed from causing roof collapse.
In the old air, water, gas and harmful gases are generally accumulated. If it is penetrated with the old air, an accident may occur. Therefore, there is an old empty space in front of the mining face. The position and area of ​​the old air should be provided by the surveying personnel first. The ventilation department should find out the water, fire, gas and other conditions in the old air. When you open your eyes, if you find water in the blasthole, the temperature suddenly rises or falls, a large amount of gas rushes out, and the coal rock becomes loose. It is a sign that it is close to the old sky. To find out the situation, you can blast and blast the old All of them are evacuated to a safe place. After the blast, only after the situation of the old air is ascertained, and the danger is removed, the work can be resumed.
Close to the effluent zone, it is prone to water leakage accidents, resulting in damage to equipment and personnel, and serious flooding of mines. Therefore, if the working surface is found to be permeable to water (rust, sweat, air, cold, fog, water on the roof, water in the floor), no blasting is allowed. The cause should be identified and properly disposed of. When you open your eyes, you will find that the blasthole is seeping water. Do not pull out the drill rod.
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