1. Identifying the signs before the occurrence of a roof accident and taking corresponding preventive measures is an important method to prevent roofing accidents. The main signs before the fall are: (1) The signs before the mining face is topped: 1 The top plate is continuously broken, and the top plate in the goaf is called a thunder. 2 The top plate has more slag, the crack increases, and the crack mouth becomes larger. The amount of roof subsidence is significantly increased. â‘¢ drill drill becomes effort, since the front roof Roof pressure increase, pressure coal wall, increased spalling, is pressed against the coal wall thinning, resulting in reduced workload mechanical equipment. â‘£ face broken wooden scaffold occurs, you can hear the sound of breaking bracket, shrinkage increases in coal, such as the end of the next pillar of slate or soft layered pillar mining. 5 gas emission or water spray increased. (2) Signs before local predicate 1 The roof rock has cracks and gaps, and the small meteorites are slightly shaken or fall off. â‘¡ stand by force, audible, metal stents live column drop. 3 The bracket shed is misaligned on the pillars, there is sound on the beam, and the coal wall is peeled off. 2. Statistics show that most of the coal mine roof accidents occur in the mining face. Therefore, the roof accidents on the mining face should be prevented. Prevention of accidents in the mining face can be started from the following aspects. (1) The correct bracket form should be selected according to the rock properties of the roof and the law of rock movement. (2) When the dip angle of the coal seam is not large, the roof is broken and the pressure is large, the horizontal slab should be used. When the coal seam angle is large, it is better to use a slab. (3) The working face must be leveled, and no umbrellas or loose coal blocks should be left. (4) The working surface and the bracket and the slider should be kept as straight as possible, and the bracket must be in time. (5) In the operation of drilling, shooting, cutting coal, moving the slipper, etc., the bracket that has been damaged by live action must be repaired in time. When removing the position of the bracket when moving the slider, a temporary point column must be added in time. (6) The bracket should be erected firmly and it is forbidden to erect on the floating coal. Low Scrap Rate Mask Body Machine,Earband Welding Machine,Automatic Inner Ear Mask Machine,Inner Ear Loop Face Mask Machine Wuxi Kanghe Medical Consulting Co., Ltd. , https://www.jskanghe.com
Prevention of a roof accident
The roof accident is an accident in which the roof falls during the production of underground mines, and it is one of the disasters that pose the greatest threat to the safety and health of mine workers. According to statistics, 40% of the total number of work-related deaths in mines nationwide are due to the accident of falling roofs. Therefore, it is of great significance to strengthen the prevention of roof accidents. Preventing a roof accident can generally start from the following aspects: