I. Project Overview The 5608 working face is located in the east wing of Wucai District, with 5607 working face in the north and 5609 working face in the south. Designed for strip mining face (mining 30m, leaving 40m), the lowest elevation point of the coal layer inner surface 16 -266m. In order to ensure the safe mining of the working face, the exploration hole of the construction floor shall be used to find out the water-richness of the 13th and 14th ash and the aquifer and the connection between the aquifers, and evaluate the influence of the aquifer on the mining. Second, drilling design requirements and parameters 1. Drilling purpose: to find out the water-rich layer, water pressure, water volume, water-repellent layer thickness, water-blocking performance and connectivity of the aquifer below the floor of the working face. 2, drilling parameters Construction site Hole number position inclination Casing length Location Progressive (m) 5608 return air alley TC-1 70° -30° 16.7m 20m left sac in front of 3 o'clock 88.8 5609 Wind Lane TC-2 45° -30° 16.7m 19m left squatting room before 5 o'clock 88.8 total Designed for 2 holes, design total footage 177.6m 3. Water pressure at the orifice: According to the nearby 13 and 14 gray long viewing water level -170m, the maximum water pressure of the orifice is expected to be 1.0MPa. 4, the drilling structure: exploration hole, a hole diameter 113mm, 108mm diameter, two holes are bare holes with a diameter 73mm floor construction to fourteen gray iron red mudstone. 5. Casing length: According to the “Coal Mine Water Control Regulationsâ€, “When the water pressure is greater than 1.0MPa and less than 2.0MPa, the length of the water stop casing is not less than 10mâ€, the length of the casing is designed to be 16.7m. 6. Single hole water inflow is expected: According to the 13th and 14th gray hole exploration data of the 5607 working face on the north side, the normal water output of the borehole is expected to be Q=15m3/h, and the maximum water output is Q=40m3/h. 7. The stratum in this area is clear, and the whole hole is made of coreless drilling. 8, casing, gate valve must ensure quality, in line with technical requirements 9, the main drilling equipment: ZJL-650 drilling machine , 3NBB250 ~ 35/10 ~ 7-45 mud pump Third, casing fixing and orifice treatment According to the "Coal Mine Water Control Regulations", the test pressure must be more than 1.5 times the estimated water pressure, and the test time should not be less than 30 minutes." This design requirement: When the first-stage orifice casing is subjected to the pressure test, the compressive strength should be 2.0 MPa or more, and the withstand voltage duration should not be less than 30 minutes. After the hole was exposed to the limestone effluent, the DN100-16 gate valve was installed at the orifice. Fourth, labor organizations Safety leader: XXX Construction leader: XXX Technical leader: XXX The construction of the project is carried out by the Drilling Team of the Tongfang Work Area in accordance with the three-eighth system. During the construction drilling period, there are 3 construction workers per shift. V. Construction period The estimated construction period is 24 days (from June 16, 2013 to July 10, 2013). Sixth, drawings Attachment: exploration hole layout plan, expected sectional view, drilling structure drawing Semiconductor Parts,Semiconductor Machine Parts,Cnc Semiconductor Processing Parts,Semiconductor Parts Machining Equipment Shenzhen Kairui Precision Technology Co., Ltd. , https://www.krjgcnc.com
5608 working surface floor exploration hole design specification