Treatment of a roof accident
After a roof accident, the trapped person should be rescued quickly and ventilation should be resumed.
First, you should contact the trapped person directly (call, tap, use a geophone, etc.) to determine the location and number of people trapped. If the location of the trapped person is not well ventilated, it is necessary to try to strengthen the ventilation and use the air duct, water pipe, tunneling, drilling, etc. to deliver fresh air, drinks and food to the trapped person. If you are aware of the danger of falling again, you should first strengthen support and be prepared to make a safe escape. When working in the landing area, you should send someone to observe the changes in the surrounding roof, pay attention to check the gas changes. When removing the falling meteorites, you should use the tools carefully to avoid harming the trapped people. Different rescue methods should be adopted according to the scope of the roof accident and the ground pressure.
(B) coal mining face
The trapped person should be rescued first, followed by measures to resume production. The method of treatment should be determined according to the height of the rock formation in the roof area, the blockage of the falling rock, the position of the roof and the size of the roof. At the same time, it is necessary to take corresponding measures according to the thickness of coal seams and coal mining methods.
1. Local small topping treatment method
It is generally taken to dig the nest beam using one leg or hanging metal shed roof beam treatment.
2. The treatment method of the big top
(1) The whole lane method handles the roof. The scope of influence is not large, the roof area is not more than 15m, and the meteorites that are smashed down are not large. After taking certain measures, if they can be moved by hand, they can adopt the whole lane method to deal with the roof, that is, the method of restoring the working face.
(2) Kaixiang Lane bypasses the roof area. Generally, when the influence range of the roof is large, it is not suitable to use the whole lane method. The method of opening the roadway to bypass the roof area can be adopted, which is also called the method of partially re-cutting the open cut and re-cutting the cut limit. There are three situations depending on where the roof area is located on the work surface:
1 The top of the roof occurs at the end of the working face: the coal can be re-opened from the returning wind lane along the working face to bypass the roof area.
If the area of ​​the roof is large, the meteorite blocks the roadway, causing the gas in the return air angle of the goaf to accumulate. It can be eliminated by temporary windshield or temporary local fan.
2 The topping area is in the middle of the working surface: it can be left parallel to the working surface to leave a 3m-5m coal pillar and reopen a cutting lane. The brackets of the new cut lanes can be determined according to the condition of the roof. Generally, a beam and two column sheds are used.
3 The topping area is on the head side of the working face: the treatment method is basically the same as the roofing area in the tail side of the processing machine, that is, the coal gang misses a section of 3m-5m coal pillars, and the windward side faces the working face diagonally to make a roadway, and work Face to face.
(3) Handling of roof accidents in the face of the excavation
Before handling the fallen roadway, the shed and the shed should be used to strengthen the maintenance of the roadway near the roof. While maintaining the roadway, it is necessary to send a special person to observe the roof to prevent the expansion of the roof. There are four methods for dealing with fallen roadways: the raft method, the shed method, the wedge method, and the bypass method.
Wood raft
This is a common method for dealing with fallen roadways. It is generally divided into two treatment methods: “well†word raft and “well†word raft and small shed.
2. Take the shed method
Roof at the falling of the arch height of no more than 1m, and the top caving slate Stone does not continue, when the length of the roof fall not large, root length may be 5-8 caving material resting on two intact stent, which is take the arbor law. Then, under the cover of the "corridor" cover, the process of smashing, shacking, etc. is carried out. After the shed is completed, the top plate is connected with materials on the pergola. This method is not suitable for use in high gas mines.
3. Wedge wedge method
When the roof rock is very broken and continues to fall, and it is impossible to clean up the falling objects and the shed, the wedge can be used to treat the fallen roadway.
4. Bypass method
When the length of the roof road is small, it is difficult to handle, and the serious situation is blocked, in order to find ways to deliver fresh air, food and beverages to the trapped people, and quickly rescue the trapped people, you can take a bypass method and bypass the Fall in the area for rescue.
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