I. Overview of engineering design The main water tank is arranged at the +805 level of the auxiliary shaft yard, and the tail of the auxiliary shaft yard in the east. After erecting 62 meters from the azimuth of 272.30, it will dig into the west for 140 meters and then dig into the pump house. Main water tank: design length 242m, currently 158m construction excavation; permanent support for anchor net spray support, anchor length 1.8m, anchor diameter 18mm, anchor installation distance 0.8*0.8m; section shape is Straight wall arc arch; gross section 10.55m2, net section 8.5m2, net width 3.2m, straight wall height 1.4m, arch height 1.6m (digging arc radius 1.85m); squirt body thickness 250mm. Second, geological features and relative position of the shaft (1) Regional geology and stratum Not exposed in the field of minefield. The upper part is light gray to grayish white, medium to thick layered bioclastic rock, microcrystalline and fine crystal structure, and the lower part is meteorite strip limestone, limestone and siliceous rock. Partially sandwiched with clayey siliceous rocks, rich in anthraquinone fossils. The mine field is 181 to 258 m thick, and the maximum thickness of the borehole in the mine field is 44.44 m. Not exposed in the field of minefield. It is mainly composed of ash, dark gray thin-medium-thick silty sandstone , silty mudstone and mudstone, with fine sandstone, calcareous mudstone and 4-7 layers of limestone and argillaceous limestone, containing 6-9 layers of coal. Contains 4 to 5 layers of recoverable coal seam, generally 2 to 5 layers. It is 96.17~106.42m thick with an average of 102.17m. The thickness does not change much. It is in false integration with the underlying Maokou group. A small amount of exposure was only found near the wellhead of the No. 5 well in the Xinhua Coal Mine in the middle of the mine field. It is ash, dark gray medium thick ~ thick layered strontite limestone. The thickness is 34.62 ~ 39.30m, with an average of 37.01m. Integral contact with the underlying Longtan group. (2) Geological structure 1. Regional structure The area is located in the Yaxi syncline of the north-north-east tectonic deformation zone of the Zunyi Broken Arch Nodules in the Tailong uplift of the Yangtze Platform, the Songlin-rock anticline in the north, the Andi anticline in the south, and the Jinxi syncline into the gold. In the territory of the sand, it is transformed into a complex syncline. The structure is dominated by folds, and the faults are not developed. The secondary folds have the development of the secondary Mawo Village between the Jinsha-Western syncline and the Xinhua syncline. Jinsha-Xixi Xiangbian: Located on the east side of the minefield, the axis is about 20 kilometers long and runs toward NNE20°. The slope is more than 20 km wide. Its axis is “S†in the plane, and the axis is north-east in the south. It becomes a northeast direction, which is an open and asymmetrical slope. The northwest wing has a gentle inclination angle of 10 to 20°, and has secondary folds; the southeast wing has a steep inclination angle of about 30 to 40 degrees. The latest strata of the nuclear division are the Upper Jurassic Suining Formation; the two-wing formations are the Permian and Lower Triassic. Xinhua slanting: Located in the northwest of the minefield, it is about 70° NEE and has a shaft length of about 11km. It is the second-order fold of the westward wing of the Jinsha-Xixi slanting north. It is a gentle asymmetric asymmetry, and the oblique width is about 2~4.5. Km. From west to east, its axis passes through the Upper Permian and Triassic. The dip angle of the northwest wing is steeper, 7 to 35 degrees, generally 28 degrees; the dip angle of the southeast wing is slower, 4 to 12 degrees, generally 9 to 10 degrees. 2. Minefield structure According to the analysis of the reconciliation drilling, the original geological drilling and the existing roadway exposure, no faults with a drop of more than 30 m were found in the area. According to the main, auxiliary, and return air inclined wells, the development of the cross-section of the coal-rock stratum oblique cross-section at the end of the 1401 bottom pumping lane and the auxiliary shaft to the wind shaft is developed. The strike is 8°4′12′′—188°4′. 12′′, inclination 30°—58°, drop 1.6-9 meters. The fault is oblique with the 1401 bottom pumping lane, and the fault can be exposed at the connecting position between the roadway and the 954 yard. At the beginning of the geological exploration (mainly drilling), no subsidence columns and caves were found in the mining area. (III) Characteristics of recoverable coal seams 1. Characteristics of coal-bearing strata and coal seams The coal-bearing strata in the minefield is the Upper Permian Longtan Formation (P3l), containing 6 to 11 layers of coal. The total thickness of the coal seam is 9.49 to 12.81 m, with an average of 11.23 m and a coal-containing coefficient of 10.99%. It consists of 4 layers of recoverable coal seams, which are 4, 5, 9 and 13 coal seams from top to bottom respectively. Among them, No. 9 coal seam is well developed and is the main recoverable coal seam. No. 4 and No. 13 coal are relatively stable recoverable coal. Layer, No. 5 coal seam is unstable coal seam. The total thickness of the recoverable coal seam is 4.56~7.95mm, with an average of 6.23m, and the recoverable coal coefficient is 5.6%. No. 4 coal seam: Located in the upper middle part of the Longtan Formation, the coal seam is relatively stable and is the main coal seam that can be mined in the mining area. The bottom of the Changxing Formation is 20.10~44.60m, with an average of 25.00m. The thickness of the coal seam is 0.74~2.28m, with an average of 1.46m, including 0～1 layer of stone. It is a simple structure and stabilizes the coal seam. No. 5 coal seam: Located in the upper middle part of the Longtan Formation, it is a partially recoverable unstable coal seam. It is 5.98 ~ 9.99m from No. 4 coal seam, with an average of 6m, and the thickness of coal seam is 0.65~1.08m, with an average of 0.79m. The coal seam structure is simple and the coal seam is unstable. No. 9 coal seam: Located in the middle of the Longtan Formation, the horizon is stable and it is the main recoverable coal seam in the minefield. The upper coal seam is 8.11~15.64m, with an average of 13m. The thickness of the coal seam is 1.69~3.59m, with an average of 2.61m. It is a simple coal seam and the coal seam is stable. No. 13 coal seam: Located in the middle and lower part of Longtan Formation, it is the main recoverable coal seam with stable horizon. The upper seam is No. 9 coal seam 26.79~35.11m with an average of 29.38m. The thickness of the coal seam is 0.47~1.87m, with an average of 1.23m. The coal seam structure is relatively simple. The rock is generally mudstone and carbonaceous mudstone. The thickness of the stone is generally 0.45m, and the coal seam is relatively stable. 2. Coal seam top and bottom conditions The 1401 bottom pumping lane is between 9 coal and 13 coal in the Longtan Formation of the Permian system, 10-15 m from the 9 coal seam, 15 to 20 m from the top of the 13# coal seam, and the average thickness of the 9# coal seam is 3.24 m, 13# coal seam. The average thickness is 0.78 m. The overall trend of the coal rock formation in the working face is 106°~286°, the tendency is 16°～18°, and the inclination angle is 5～7°. According to the three boreholes ZK3-2, ZK2-2 and ZK1-1 around the 1401 bottom pumping road, the mining face is mainly silty mudstone and siltstone. The limestone in the local area is about 0.5 m, and the roadway is drilled. The Platts hardness distribution is between 7 and 10; through the borehole analysis, the thick layered limestone or argillaceous limestone is distributed in the tunneling layer, and the thickness of this layer is 0.66~5.39/3.05 meters. The layer is relatively hard, and the thin to medium-thick layered fine sandstone is developed below, and the thin strip-shaped fine sandstone is locally developed, which can be used as the marker layer for the tunneling of the 1401 bottom pumping. Coal number Full thickness (m) Thickness (m) Folder Number of layers inclination (°) stable degree Coal seam structure Coal seam spacing (m) Roof and floor lithology 0.66-2.36 Average 1.46 0.66-2.36 Average 1.46 0-1 5~7 More stable Simpler The roof is fine sandstone and limestone, and the bottom is marl, fine sandstone, limestone and mudstone. 5.98~9.99 5.00 0.65-1.08 Average 0. 79 0.8-1.08 Average 0.92 0-1 5~7 Unstable Simpler The roof is siltstone, argillaceous siltstone, and the bottom is mudstone, siltstone or fine sandstone. 8.11~15.64 13.00 1.69-3.59 Average 2.61 1.69-3.59 Average 2.61 0-1 5~7 stable simple The roof is fine sand, partially mudstone, and the bottom is gray mudstone. 7.34-17.67 29.38 13 0.47-1.87 Average 1.23 0.47-1.87 Average 1.23 0-3 5~7 More stable Simpler The roof is siltstone and mudstone, and the bottom is mudstone and fine sandstone. (4) Relative position of the shaft 1. The corresponding position of the main water tank and the ground is mountainous. There are no buildings and water bodies on the ground, and there are seasonal waters in the valley during the rainy season. 2. The 13# coal seam will be exposed during the excavation construction process. According to relevant information, it is expected that the 13# coal seam will be exposed at 180m. Third, the project construction situation 1. Project progress 1. The main water tank has been excavated 158m; 2. The positional relationship between the current working face and the rock formation At present, the main water warehouse is a full rock tunnel. Its lithology is: 1. Main water tank: The lithology is mainly composed of argillaceous limestone and fine sandstone, siltstone and mudstone. The horizon is relatively stable. The drilling work of 13# coal seam should be strengthened during construction to accurately determine the position of 13# coal seam. Fourth, construction organization and management (1) Construction organization: The construction personnel will be organized by the mine ventilation department, and the anti-burst team will be managed in a unified manner. (2) Construction management. Construction management refers to the whole process management except for the management work in the drilling construction, except for the reasonable arrangement of personnel and the supporting use of drilling rigs and drilling tools. 1 The site must have drilling design drawings and instructions, and indicate the number of holes, location, spacing, azimuth, angle (upward, downward), aperture, hole depth, precautions and special requirements, etc., and require construction operators to be in construction. Strictly observe. 2 There must be safety technical measures. Specific measures are proposed for specific locations, security issues that operators should pay attention to, handling methods in the event of an accident, disaster avoidance routes in the event of a disaster, etc. 3 In the drilling construction, each class must have a drilling construction record, including: construction time (year, month, day, shift), aperture, footage, lithological changes and various problems in the construction, so as to Personnel and successors will keep abreast of the situation on the spot. 4 During the construction process, there must be detection tools and personnel for gas and toxic and harmful gases to prevent gas and toxic and harmful gases from flowing into the working face, causing gas accumulation and accidents. 5 After the completion of the drilling construction, the quality management department shall conduct the inspection and acceptance, and must pass the inspection and acceptance before passing the next step. 5. Use ZDY-1250 coal mine hydraulic tunnel explosion-proof drilling rig , and equipped with relevant facilities such as switches and gas sensors. Punch the front of the work surface to predict the situation ahead of the work surface. Six, drilling personnel operating procedures 1. First check the tightening of the screws in each part of the rig, and tighten the loose screws. 2. Check whether the rotating parts of the drilling machine are flexible and reliable, and wipe the sliding surface of the exposed rotating parts clean. 3. Check if the oil in the fuel tank is sufficient. 4. Before starting the machine, the rig should be idling for 5-10 minutes to confirm that all parts have no problem before starting work. Page 2 / (2 pages in total) 6. Each class shall inspect the wear of the drill pipe, the bending condition and the damage of the thread. 7. Check if there are any obstructions in the eyelet of the drill pipe before the upper pole. 8. When the new drill bit is inserted into the hole, the driver should be cautious. When the hole is 0.3-0.4m from the bottom of the hole, the drill bit must be gently rotated to the bottom of the hole. 9. When starting to drill, the speed should be slow, the pressure should be small, and gradually pressurize. When the drilling is normal, the pressure is appropriately adjusted according to the drilling level. 10. When changing the drill bit, it is necessary to select the drill bit reasonably. Pay attention to the diameter of the drill bit to match the hole diameter to avoid the bad bit. 11. In each operation process, the position of each operation handle should be ensured to be correct. 12. When operating, you should do two listening, two watching, and four attention. Listening: Listening to the sound of the hole and the sound of the machine; two look: look at the amount of coal powder returned in the hole, the color and the change of the pressure gauge of the rig; four notes: focus on energy, do not chat with others, pay attention to changes in the hole In case, pay attention to keep it even. 13. When the rig is operated, the gearbox must be stopped before the gear shift can be performed. 14. When operating the drilling rig, the personnel who add the drill pipe should stand on the side to observe the drilling situation, and it is strictly forbidden to face the drilling operation. 15. Abnormal conditions (such as a large amount of gas escaping, permeable water, hydrogen sulfide or other toxic and harmful gases, drilling and drilling, etc.) must be stopped immediately during the rig process. The personnel should be evacuated from the scene and immediately report to the mine leader. And take effective emergency measures. 16. During the handling of the rig, it should be prevented from colliding and damaging (including squeezing) the machine or tubing. When transporting parts, protect the oil pipe and threaded interface to prevent the sediment from entering. 17. After the rig enters the working place, the appropriate position should be selected, the frame should be placed at the lowest point, and then the power head part should be lifted to the top of the frame, and bolted to the frame according to the selected position to adjust the orientation. Corner, anchor the frame with a column. 18. Turn on the power. Before starting the machine, first check whether the overall installation meets the safety requirements, check whether the motor is stuck or not, and whether the hydraulic system is connected correctly. If the problem is found, it should be dealt with immediately. Jog the motor to check whether the direction of rotation of the motor is consistent with the calibration direction of the oil pump. Whether the motor or the oil pump has abnormal noise, then start the motor for trial operation, check whether the system works normally, and there is no oil leakage at the joint. 19. The operator's clothes, towels and lamp wires must be worn and tied. The upper and lower drill pipe personnel must stand on the side of the drill. They should not be in line with the feeding, nor can they obstruct the sight of the steering handle. 20. When drilling, if the abnormal situation should stop drilling immediately, the gas should be checked regularly, and the gas portable instrument should be suspended on the return air side within 5m of the drilling machine; the driller must be evacuated to the designated safe place when shooting. The gas concentration at the location of the drill shall not exceed 1.0%, otherwise it is not allowed to send electricity for drilling. 21. It is strictly forbidden to operate the equipment with disease: Before each shift, it is necessary to thoroughly check the integrity of the various components of the equipment. The temperature rise of bearings, oil pumps, motors and motors should not exceed 60 °C during operation. Otherwise, it should be stopped for inspection and processing. To select the drill bit and the drill pipe, do not tap the drill pipe to avoid damage to the trapezoidal buckle at the joint. 22. Strengthen the maintenance and repair of the drilling rig: Regularly fill the moving parts for each moving part, especially the lubrication of the hexagonal shaft, and regularly clean or replace the filter. 23. After each shift is completed, check the equipment and make the shift work. Turn the switch handle to zero and lock it to leave the scene. Seven, "predictive forecast, first exploration and then excavation" construction plan In order to ensure the safe construction of the main water tank, prevent the 13# coal seam from being accidentally exposed, and accurately detect the distance between the floor of the roadway and the recoverable coal seams, and also serve as a means of supplementary exploration. According to the principle of “doubt must be exploredâ€, during the construction-oriented construction process, the construction plan of “predicting and forecasting, first exploration and then excavation†is adopted. 1. Strengthen daily geological prediction and forecasting work In the construction, the geological prediction and forecasting work shall be done, the geological data provided by the drilling shall be verified regularly, the construction dynamics and the changes of the surrounding rock and the marking layer shall be mastered, and the geological changes within 30 m in front of the working face shall be predicted in time. Safety, geodesy, production, technology and other departments must focus on the analysis of geological conditions and the positional relationship between the working face and the coal seam every week, and provide geological prediction and forecast data to the construction team and relevant leaders of the project department to guide the construction. Geological prediction and forecast data are provided by the geodesic (technical) department. 2, implement dynamic tracking Implement a dynamic tracking and reporting system for geological conditions at the working surface. The technical personnel of the Ministry of Mines Construction and Construction Unit shall timely grasp the construction dynamics and the changing trend of the rock face at the working face and the presence or absence of abnormal conditions. The daily leadership and dispatching room of the mine construction headquarters will report the geological conditions of the working face, and the head of the construction team will report to the mine construction headquarters every day. And the project department leader reported the progress of the project. 3, first explore and then dig (1) In the construction process of simple geological structure, stable rock formation and undeveloped fissures, different “first exploration and then excavation†measures are adopted according to the different situation of the rock pillars of the roadway floor from the coal seam. 1. When the bottom of any working face is less than 10m from the coal seam (any coal seam with a thickness greater than 0.3m) (normal distance: the same below), the “long exploration and short excavation†measures are implemented: Before the first two exploration holes, the length of the front exploration hole in the horizontal projection direction is not less than 30m, the angle and orientation are consistent with the slope and orientation of the well, and the entrance to the coal seam is not less than 0.5m; the lower exploration hole enters the coal seam floor not less than 0.5m, the drilling inclination angle is not less than 60°, in order to accurately detect the distance between the floor of the roadway and the coal seam, and to ensure that the exploration hole of the horizontal projection direction is no more than 5m. 2. When the rock face of the working face is less than 5m from the coal seam, take the measures of “long exploration and short excavation combinedâ€: that is, after drilling 3-4m (two cycles) in the roadway, the working face is vertically downward. Arrange one drilling hole, the drilling inclination angle is not less than 80°, and the drilling hole enters the coal seam bottom plate not less than 0.5m, in order to grasp the accurate roadway and coal seam rock column thickness, and keep the leading ahead leadage no less than 30m, which is the forecasting Provide evidence. At the same time, the “re-exploration†measures are adopted: three small-diameter (42mm) advanced drill holes are added on both sides of the excavation face, and the lead distance is not less than 2m, so as to ensure that the excavation face and the coal seam must maintain a rock thickness of not less than 2m. column, Attachment: Schematic diagram of drilling and drilling (see the end of the article) 3. The coal seam horizon and geological structure must be strictly controlled during construction to prevent gas from escaping or accidentally penetrating the coal seam. 4. When the rock face of the working face is less than 2m from the coal seam, a full-section one-shot coal construction method must be adopted. (2) In areas of geological anomalies (faults, folds, subsided columns, igneous rock intrusion and rock dip, thickness, sudden structural changes, fracture development, etc.), no matter the size of the rock between the roadway and the coal seam, it is necessary to drill in time to detect the front. The conditions of coal seam occurrence and geological structure within 30m range, and allow 20m to be excavated and maintain a lead distance of 10m. The number of drill holes is not less than three (one in front of the heading face and one on each side of the roadway, and the drilling angle to the floor is 10° to 20° in the direction of the roadway), and there are still allowed in the tunneling range. In case of abnormality, the drilling of the patch should be redesigned until there is no danger. At the same time, short-drilling and short-drilling measures must be taken during the tunneling process. Eight, safety technical measures (1) Strengthen drilling construction management and strictly enforce operating procedures 1. Conduct a comprehensive inspection of all electrical equipment in the shaft before drilling to eliminate the phenomenon of explosion and all unsafe hidden dangers. 2. Carefully clean up the impetuousness of the working surface. 3. Each Anwar member must wear both optical and portable tile detectors to cooperate with each other to ensure correctness. Every shift leader, team leader, electrician, gunner, etc. wear a portable gas detector to detect gas at any time. 4. Drilling work is carried out by professionals (anti-sudden and water-inducing workers) and strictly in accordance with the operating procedures. 5. When an abnormality is found in the drill field and in the hole, the power failure check should be stopped immediately, and the power should not be sent before the treatment, and the drill pipe should not be pulled out. 6. During the drilling process, the rock powder and footage should be observed frequently and the original records should be made. 7. Electromechanical personnel should check the operation of the equipment frequently, find out the problems in time, and prevent the equipment from exploding. (2) Strictly implement safety regulations and strengthen gas management work 1. Use the pre-class to ask questions such as the captain, squad leader, inspector and other major types of work related to the prevention of knowledge, in order to improve the overall quality of the workers. 2. A portable gas alarm is hoisted on the working surface during drilling. All the in-well personnel must wear an isolated self-rescuer and will use it. 3. The inspector carefully marks the work at the working face, measures the gas concentration at any time, closely monitors various situations on the working surface, and immediately organizes all personnel to raise the well when abnormalities are found or when there are prominent signs. 4. When the wind is stopped due to maintenance, power failure, etc., the personnel must be evacuated, the power supply must be cut off, and when the ventilation is confirmed and the concentration is less than the specified value, the staff can enter the work surface. 5. All personnel are strictly forbidden to bring tobacco and ignition items to the well. It is strictly forbidden to wear chemical fiber clothes, bring electronic watches and drink down the well. 6. The damaged air duct must be replaced before drilling to ensure that there is enough air volume on the working surface. (3) Strengthen daily geological observation and data collation 1. The technical person in charge and the geological technician should regularly verify the geological data provided by the drilling, master the construction dynamics and changes in the surrounding rock, and prevent the coal from being accidentally revealed. 2. Reporting procedure when geological anomalies occur: When the team leader finds geological anomalies on the working face (faults, folds, subsided columns, igneous rock intrusion, rock dip, thickness, sudden structural changes, crack development, etc.), the first stop is to stop the drilling. Report to the project manager and technical leader in detail. After the manager or technical leader has figured out the situation, he should immediately report to the leadership of the mine headquarters. 3. During the construction process, the gas emission abnormality, the sudden and small amount of the gushing, the topping piece is serious, the thunder in the distance, the protruding sight of the drill, the top drill, the spray hole, etc., should be stopped immediately, and Report to the mine headquarters in time, and the mine headquarters can take measures before construction. (4) Shooting management: 1. Strictly implement the "one gun and three inspections" and "three-person chain replacement" shooting system. The inspectors and the gunners strictly control the gas and adhere to the "ten no guns" system. 2, the use of coal mines to use more than three levels of water-based explosives (or three or more emulsion explosives). 3. All the holes or boreholes shall not be transparent to the blastholes. Otherwise, the blastholes must be replenished. All blasthole seals shall comply with the regulations. 4, charging and shooting: no one charge, one shot. 5. All detonators use the mine to allow the use of milliseconds to delay the detonator, and the total delay time is not more than 130ms. 6. After confirming that there is no abnormality after at least 30 minutes of shooting, the construction personnel can enter the working surface. (5) Ventilation management: 1. The fan should be guarded by a special person. If there is an accidental power outage, it should be contacted in time, and the power should be sent as soon as possible. The on-site Anwar and the team leader (or captain) will organize the construction personnel to withdraw. After the power is delivered according to relevant regulations. Then organize the construction. 2. The air cylinder is hung straight, the joint is tight and the air is not leaking, and the end of the air duct is no more than 5 meters away from the working surface to ensure that the effective air volume of the working surface is sufficient. (6) Anti-gas and anti-burst: 1. Each Anwar member is carefully staring at the work, checking the gas concentration in the working face and the return airflow to prevent the accumulation from exceeding the limit. When the gas concentration is abnormal, report to the project department and the dispatching room in time. When the gas concentration exceeds 1% and is less than 2%, the gas emission measures should be immediately discharged according to the local conditions. 2. The Anwar staff must hand over the shift on the spot. The shift must explain the abnormal situation of the shift. After the shift, the work surface must be checked again. During the whole work, an abnormality is found. Immediately cooperate with the captain (team) to evacuate all the evacuation routes. Construction personnel and report to the head of the duty mine. 3. Install gas sensors and other instruments according to regulations and meet the regulations. When the gas exceeds the limit, the power of the electrical equipment in the construction roadway can be effectively cut off. 4. All the downhole personnel carry an isolated self-rescuer with each person. Everyone entering the working face must be familiar with the use of the self-rescuer and the evacuation route safely evacuated from the working face to grasp the signs of coal and gas. Features. 5, highlighting the omen There is a sound omen; the top plate is pressed to break down, the bracket is pressed, and the coal seam generates vibration. The sound of the coal cannon is continuous, and the sound is small after the first sound, and the sound is louder and closer. Silent omen: gas emission is suddenly large and small, the working surface temperature drops, the coal seam is disordered, the hardness of the coal body is reduced, the soft stratification is increased, the coal wall is sweating, the color of the coal body is dim, the coal dust is flying, and the drill is drilled. , drill, nozzle, etc. (7) Safe disaster avoidance Working face → main inclined shaft → overhead passenger device → ground. Attachment: The main water tank avoidance route. (8) Other unfinished matters Strictly implement the “Safety Regulations for Coal Mines†and the “Operation Regulations†for each wellbore. V. Organizational leadership and responsibility system for “first exploration and then excavation†work (1) Organizational leadership: Team leader: Chen Yang (mine manager) Deputy Team Leader: Wu Jiahong (Chief Engineer) Group members: The main heads of the deputy mines and the departments of the Ministry of Mines and Construction, project manager and deputy manager. (2) "Learn first and then dig" work responsibility system 1. The team leader is responsible for the “first exploration and then excavation†work of the mine construction work face, conscientiously implements the measures, and organizes the manpower and material resources required for the deployment. 2. The deputy and members are responsible for the “first exploration and then excavation†work that they are in charge of, and conscientiously implement the measures, and strive to do a good job in this work, and “pre-exploration and excavation†construction organization is in place. The technical person in charge is responsible for the implementation of the entire measure, and provides technical guidance, records, and reports during construction; the person in charge of electromechanical is responsible for the explosion-proof inspection of mechanical and electrical equipment, and the maintenance and repair of anti-surge equipment; 3, with the class Anwa staff responsible for the implementation of supervision measures, and do a good job of gas detection of the hole. 4. The construction team is responsible for the team's “first exploration and then excavation†work, earnestly implements the various clauses, organizes the whole team to do the work of the team, and the workers are engaged in the post. "Responsible for work, and strive to do the work that you have done. Nine, training and implementation 1. After the approval of this measure, all project personnel from the project department will carry out the study and group signing. 2. The original construction measures and operating procedures must be carried out at the same time. Ten, other 1. If the coal body appears in front of the borehole, the mortgage coal measures shall be implemented. 2. Execution is strictly carried out in accordance with the relevant regulations of the mine team and the provisions of the Regulations. March 13, 2015
Aluminum Die Cast light Housing series
Best service:
Our Advantage
2) From design, casting, testing to delivery exports provide a total solution,
3) Super precision, competitive price and prompt delivery
4) Excellent QC, QA systems guarantee superior quality
5)Available for OEM and ODM services
6)High precision, good quality Durable materials keep long.
Aluminum Die Casting Light Housing Led Bulb Housing,Die Cast Aluminum Lamp Shade,Aluminum Die Casting Lamp Covers,Aluminum Die Casting Lighting Housing Ningbo WEIBO Molding&Machine Co.,Ltd. , https://www.diecasting-manufacturers.com Coal number Full thickness (m) Thickness (m) Number of layers inclination) Stability Coal seam structure Coal seam spacing (m) Top, bottom slate of 4 0.66-2.36 average 1.46 0.66-2.36 average 1.46 0-1 1 5~7 More stable Simpler The roof is fine sandstone and limestone, and the bottom is marl , fine sandstone, limestone and mudstone. 5.98 to 9.99 5.00 5 0.65-1.08 Average 0. 79 0.8-1.08 average 0.92 0-1 1 5~7 Unstable Simpler The roof is siltstone, argillaceous siltstone, and the bottom is mudstone, siltstone or fine sandstone. 8.11~15.64 13.00 9 1.69-3.59 average 2.61 1.69-3.59 average 2.61 0-1 1 5~7 stable simple The roof is fine sand, partially mudstone, and the bottom is gray mudstone. 7.34-17.67 29.38 13 0.47-1.87 average 1.23 0.47-1.87 average 1.23 0-3 1 5~7 More stable Simpler The roof is siltstone and mudstone, and the bottom is mudstone and fine sandstone. 
1. Aluminum Die Cast light Housing series.
2. With high quality.
3. Different surface treatment ISO9001:2008 certification.
5. Long life of Housing and Protect the light source.
6. Aluminum Die Casting suitable for Aluminum Die Casting CCTV Camera Housing,Moulds/Tooling,motor casing,pneumatic piston,water pumps and other series products.
1, Good communication with every of our customer, especially willing to discuss the details of your drawings.
2, On time delivery.
3, High quality lamp part series with a good price.
1) Abundant profession experiences and more than 20 years manufacturing history
In order to improve construction safety, to prevent accidental revealed in the construction of the coal layer, cause accidents, especially the development of this measure.