ã€China Deep Hole Rig Trading Network】 1. Project Overview Hongling Coal Mine - 140 lanes No. 6 coal bunker is a coal bunker that is centrally transported in the underground coal bunker and is a coal bunker serving two mining areas. The coal bunker has a diameter of 4.5m and a height of 13m. The design capacity is 180m3 and the capacity of coal is 260t. The warehouse body shall be supported by hanging nets and bolts and shots, and the coal storehouse shall be supported by double-layer net anchors and cast support. The number of sprayed and poured concrete shall not be less than 200. Support thickness 200 mm. The entrance of No. 6 coal bunker is located in the -140 lane, and the bottom is a belt concentrated transport lane. The properties of the rock passing through the rocks from top to bottom are mudstone and limestone, respectively. The Platts' coefficients are 2-4 and 6-8 respectively. 2. Selection of construction plan At present, the domestic underground coal bunker construction generally adopts the anti-well construction method. In general, the anti-well construction method first completes the construction of the upper and lower roadways of the coal bunker warehouse, and then the bottom-up construction lap is run through the upper and lower tunnels, and then From top to bottom, the scouring wells are brushed up to the design section and filled with rock from the bottom roadway. The construction technique of slippery wells has the advantages of rapid construction of reversed wells and safe construction. However, the equipment purchase and maintenance costs are high, and the equipment is bulky. It requires a large space at the construction site, and requires high quality for the construction workers, and the small and medium size There is also a problem that the mine shaft section is small and the equipment is difficult to enter the well. 2 Ordinary anti-well construction method, that is, dig ditches from bottom to top, and then brush from the top to the bottom of the coal bunker design section. The disadvantage is that the pit wood is consumed, and the accidents such as the obstruction of the gangue or the collapse of the wooden frame during the construction are prone to occur. The safety is poor, and the construction speed is slow, the labor intensity of workers is high, the work efficiency is low, and the construction period is long. In the past, the coal bunker in the underground mining area of ​​the Hongling coal mine and the construction of coal-mesh coal have used this method. Based on the above two types of anti-well construction methods, the deep hole blasting drilling rig drilling hole hanging tank construction method was applied creatively. The success was achieved by using it in the construction of No. 6 coal bunker. This kind of deep hole blasting anti-well construction method has the characteristics of strong adaptability, safety in construction, short construction period and low engineering cost. 3. Construction process 3.1 slippery well construction 3.1.1 slippery well construction method The slide shaft is arranged in the center of the coal bunker and has a diameter of 1.5 m. First, use a geological drilling rig to drill a hole with a diameter of 110 mm along the center line of the coal bunker and connect the upper and lower chambers of the coal bunker. The main role of mesopores is to guide and promote and provide a free surface for blasting. The construction of slippery wells is the key to the entire project, which accounts for a long construction period and the maximum construction difficulty. Therefore, the design of deep hole blasting and blasting borehole blastholes are used for the construction of geological drilling rigs, and the drilling rig is installed at the entrance of the coal bunker. The construction of the slippery wells is constructed by the construction of the anti-well construction method from the bottom up, and the personnel are standing on the suspended tanks. One JH-8 winch winch is installed in the roadway connected to the upper chamber to raise the winch, and a guide fixed pulley is installed at the top of the upper chamber of the coal bin. The winch lifting wire rope is connected with the lift tank through the fixed pulley and the guide hole. . After the winch lifts the suspension tank to reach the predetermined operating position, the tank personnel extend the canister device to stabilize the hanging tank, slam on the top platform of the tank, and pin the anti-dropping device on the pin to perform the charging operation. At the end of the charge, a gas inspection and charging line were performed. Then Panasonic hangs the can and releases the gun to complete the cycle. In this way, the operation is cycled in sequence to complete the construction of the slide shaft. 3. 1. 2 blasting well blasting design (1) Arrangement of blastholes. The slide shaft is broken and has a diameter of 1. 5m. The lifting hole is the second free surface, and four boreholes are uniformly distributed around the circumference of the diameter of 600mm, ie, the inner ring borehole; the peripheral eye (outer ring borehole) is arranged at the center of the lifting hole, diameter of 1. 5 m On the circumference, 10 boreholes are evenly distributed, as shown in Figure 1. (2) The diameter of the blasthole. According to the drilling equipment and the amount of explosives, the diameter of the blasthole is 54 mm. The fundus level error is required to be no more than 1%. (3) blasting depth. The squat well is fully sub-divided into three blasts with a single blast depth of 5 m. (4) Blasting parameters. The parameters of soil blasting in slippery wells are shown in Table 1. Table 1 Construction blasting parameters of slippery wells Circles per eye/lap per second shot angle (°) Eye depth/mm Eye distance/mm Charge per dose/kg Burst order connection (5) Rock loading. The gangue is transported from the picking machine located in the lower lane of the coal bunker to the It cart. 3. 1. 3 slippery well construction points Strictly control the construction quality of the borehole and the borehole shaft, and the horizontal borehole error should not exceed 0.5%, and the horizontal borehole borehole error should not exceed 1%. For deep hole blasting, the quality of closed mud shall be ensured. The charge structure shall be water column (about 1.0 m), clay mud (0.2 m), medicine roll and clay mud (1. 0 m) from top to bottom. Lift signal contact. The acousto-optic signal devices are installed in the winch and hanging tank respectively. The signal line is laid along the roadway that has been excavated to ensure smooth communication. During the operation, the winch driver must stick to his position. Before each shot is fired, the suspended cage should be about 10 m from the exit, and after the cage is lowered, connect a piece of waste steel wire at the end of the wire rope to prepare for blocking the rope hole after the gun is released. Use the method for pulling back to clear the through hole. . Before each lift, the connection between lifting steel wire ropes, pulleys and steel wire ropes and suspension tanks should be inspected carefully. After confirming the correctness, the tank operation can only be performed. A 1. 5 kW local fan with a diameter of 400 mm air duct is installed at the air intake of the lower roadway, and the air is lifted and lowered with the lift tank. 3. 2 coal bunker construction After the construction of the slippery well is completed, the section of the slippery well is brushed from the top down to the design section of the coal bunker. During construction, ordinary borehole construction is used: drill hole drilling, borehole depth 1.2 m, and loop footage 1.2 m. The outermost drill hole uses smooth blasting, and the light blasting method is the same as the light blasting method used when driving a roadway at ordinary times. As the brush is supported by hanging nets and bolts, the upper and lower locks of the coal bunker are constructed simultaneously with the coal bunker. 4, the effect of verification The No. 6 coal bunker in the coal mine of Hongling Coal Mine Co., Ltd. is required to meet the needs of the reconstruction of the mine transportation system. The coal bunker construction period must not exceed 50 days. The first application of the deep hole blasting method has been successful. The coal bunker started on April 16, 2007 and was completed on May 30. The total construction period was 42 days, in which the blast hole for the center hole and slip hole had a duration of 5 days, and the blasting time for the slip hole was 2 days. The coal bunker had a large brush. The support period is 20 days and the installation period is 5 days. Compared with the original plan, the construction task was completed 8 days ahead of schedule. There was no accident at work during the construction process, which was a saving of 1835 yuan per meter compared to the traditional shallow hole blasting method. The economic benefit was obvious, and the safety was short. After the successful application of the deep-hole blasting method for the construction of coal bunkers in Hongling Mine, it has been popularized and applied in similar projects. The method was also applied to the construction of the coal bunker in the orchard mine in May 2008, both of which achieved good results. Practice has proved that the use of deep-hole blasting, the construction method is simple, the construction speed, safety, and high economic efficiency. This technology has achieved the goals of safety, rapidity, and low consumption. At the same time, it has the characteristics of convenient operation, simple and easy to use, and overcomes the shortcomings of poor construction safety, slow construction speed, and long preparation time for common anti-well methods. For more information, please pay attention to the China Deep Hole Rig Trading Network () Washing Machine,Vegetable Washing Machine,Potato Cleaning Machine,Vegetable Washing Equipment Shuangfeng Nongjiabao Machinery Technology Co., Ltd , https://www.starchmakingmachine.com