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Safety Technical Measures for Working Face Crossing Old Roadway
Release time:
2019-08-27
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Working face over old laneSafety technical measures
Due to the long time and the influence of the advanced pressure of the working face, the support in the old lane has more broken beams and broken columns, the roof is broken and easy to fall. When the working face passes through the old lane, the following measures should be taken.Safety technical measures：
1, yes.VentilationThe old lane, to first air discharge accumulated gas.
2、VentilationAfter that, the lane was repaired. The repair method was as follows: a joist shed with one beam and two columns or one beam and three columns was built under the original support of the old lane. For local roof fall on the support of the old lane, wooden stacks should be used to connect the roof.
3, the pressure is very large, the roof is broken old lane, should be close to the old lane when gradually adjust the working face advance (direction) oblique intersection with the old lane, can not be parallel to the old lane advance.
4, the working face should be as far as possible to put small guns or vibration guns, reduce the damage to the roof of the blasting, will be through the old lane should stop shooting instead of hand pick.
5, the working face and the old lane intersection control top surface area is large, top pressure is concentrated, to encryption support plus wooden pile.
6. If the old lane is above the working face, the long wooden beam larger than the width of the old lane should be used to support the top. One end of the wooden beam should go deep into the coal wall beam nest and be pasted with help columns. The other end should be on the lifting shed along the inclined direction. The long wooden beam should be tightened with wood. After the column is returned, the side of the goaf is stacked with wood.
7. If it is a thick coal seam, the old lane is below the working face. Before crossing the old lane, fill it with coal. When the working face is pushed to the old lane, a long bottom beam should be punched on the bottom plate, and the pillar should be supported on the bottom beam to prevent the pillar from sinking. In the old lane, wooden crackers should be added to protect the roof.
8, working face through the old lane to speed up the progress, while mining side support, try to reduce the empty roof time and area, to prevent roof fall.
9. Tile inspectors must be on duty at the site to check the gas, carbon dioxide and other harmful gases in the operation area at any time. When the concentration of gas and carbon dioxide reaches 1%, the drilling with electric drill must be stopped. When the concentration reaches 1.5, the work must be stopped. The evacuation personnel must cut off the power supply and the mine rescue team will handle it. When the concentration of gas accumulated in a space with a volume greater than 0.5m3 reaches 2.0, the evacuation of personnel must be stopped within 20m nearby, the power supply must be cut off, and the ambulance personnel shall carry out gas discharge.Measures.
10, in the working face to and from work handover, working face through the old lane section must focus on handover, shall not appear a unqualified pillar.
11, where the working face over the old empty area appearedSecurityHidden dangers, according to the "Bai Ping"coal mineThe "Three Violations" Penalty Provisions are subject to a maximum penalty.
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