1 mine profile
Zhongtai Mining (former No.4 Mine) has an existing mine field area of 15.2km2 and a design capacity of 900,000 t. Now the second 1 coal seam is mined, and the current mine expansion is10.5 million t, with a total mine reserve of156610.6 million tons. Zhongtai Mining (the former No.4 Mine) began to rebuild and expand in August 2005, and it has been four years since then. Due to the large amount of roadway reconstruction and expansion, the cross section of the construction roadway is 16.7m2, which brings serious pressure to the hoisting of the north auxiliary shaft and the supply of tramcars. In order to solve this problem, after analysis and demonstration, the main managers of rock roadway decided to adopt the methods of rock harrow loading, belt transportation and gangue storage in the reconstruction and expansion area. Through the excavation of three roadways currently under construction in the reconstruction and expansion area, it laid a foundation for alleviating the shortage of harvesters, reducing the unsafe factors of harvesters' ramp transportation and improving production efficiency.
2 the basic situation of gangue silo
The excavation site of the waste dump is the intersection of two roadways in the -450 area, and the deviation of the center line of the return air connecting lane of the -450 electric garage is 1.3m, which is convenient for transporting materials, shotcreting and transporting equipment. The deviation of the center line of the -450 m horizontal drift between the underground inclined shaft and the lower track is 1.2m, which is convenient for the transportation of the -450m auxiliary horizontal track transport lane in the future. The design depth of the garbage bin is10.3m. Among them, the bin body is 6.54 m, the locking depth is10.56m, the locking depth is 2.2m, and the diameter of the bin body is 4 m. The bin body is supported by anchor net and shotcrete: the anchor rod is metal resin anchor rod, L=2. 1m, φ = 20. The thickness of sprayed concrete is 100mm, the strength grade of concrete is C20, and the mixing ratio of concrete is: cement: sand: crushed stone: water = 1: 2.2: 2.3: 0.40. The upper and lower shiplocks are supported by concrete with a thickness of 350mm and a strength grade of C20. The concrete mix ratio is: cement: sand: stone: water = 1: 2.79: 5.58: 0.75. Before concrete pouring, anchor net and shotcrete are used for support, and the volume of waste bin is106.35m3.
3 waste warehouse construction scheme and time limit for a project
The construction scheme of waste bin is divided into two steps: the first step is to excavate from bottom to top and support it with wooden cribs; Step 2, brush the driveway and concrete silo from top to bottom; The third step is to install the gangue silo.
The time for excavating the gangue bin is: shift from 0: 00 in February 16 to shift from 4: 00 in February 19, with only 16 sub-shifts. Brush down, after the silo is poured with concrete, it will be cured for 28 days, the project will be completed on March 30, and the gangue silo will be put into use in early April.
4. Benefits of using belts and garbage bins
4. 1 Unused belts and waste bins share a transportation line (270 inclined lane transportation) between the -440m sub-level dedicated return air roadway and the -440 return air hidden inclined shaft. Before digging the gangue bin, both ends use the same yard and a 55kW winch to load and unload materials. Empty car supply and transportation are tight and affect each other. Only 270 ramps are transported, and each shift is non-stop. A maximum of 35 cars are ballasted, with a footage of 2.35 m, with an average footage of 1. 17 m at both ends. Driving, pushing, reversing and counting hooks take up 6 people, and the work in one shift is relatively tight, with an average of 6 cars of waste per person. Moreover, we should pay attention to the safety of transportation links, and pulling and releasing the car stopper is of great labor intensity, low safety factor and low efficiency.
4.2 Benefits after adopting belt and gangue silo
4.2. 1 Greatly reduce ramp transportation and reduce unsafe factors.
4.2.2 Avoid accidents when trolleys and harvesters fall off the road.
4.2.3 Reduce the labor intensity of workers, and do not push the cart, unhook or pull the car stopper.
4.2.4 The slag discharge efficiency is improved by 2.58 times. When using the winch, there are 35 vehicles in each shift, with 4 people in each shift, with an average of 5.8 vehicles per person. Using the waste bin and two belts, two people in each class put 60 cars of waste rock, with an average of 15 cars per person.
4.2.5 Alleviate the shortage of empty cars.
When the ballast car is affected, it will not affect the normal excavation, and the economic benefit is considerable. The volume of the waste bin is106.35m3. Once the empty car is affected, the waste bin can store 70 car residues, which can make the two tunneling faces tunnel 3. 18m (every tunneling 1.6m). If there is no gangue bin, both ends can't be dug, and the footage is zero.
4.2.6 Improve the single entry level. Before using waste bin and belt transportation, 35 trucks of waste rock are transported at both ends of each shift, and both ends can be dug 1.57m, with a single entry of 0.78m After using waste bin and belt transportation, 60 trucks of waste rock are put into each shift, and two tunneling faces can be excavated 3. 1.59m, with an average single entry per tunneling face.
5 conclusion
The combined use of gangue bin and belt alleviates the transportation problems in the reconstruction and expansion area, with remarkable economic benefits and safety factors, and solves many new safety problems in coal mines, which has made positive contributions to the timely production of Sino-Thai mining reconstruction and expansion projects and is worthy of further popularization and application.
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