Safety technical measures for shaft recovery of vertical shaft?

1. overview of the intake shaft in the security zone of Xinjing mine, the depth is 45m, and the shaft diameter is 7m. Now, 4m has been constructed, and the shaft construction is expected to be completed by the end of August. In order to ensure the safe and smooth recovery of vertical shaft grab, hanging plate and slip film, the following safety technical measures are specially formulated: 2. Organizational measures During the recovery process, the branch will set up a recovery organization. Team leader: Shang Yonghong and Zhang Yuxiang, deputy team leaders: Wang Jianjun and Huo Bingchun. Recycling personnel: Zhao Ailiang, the comprehensive team, is responsible for coordinating the division of labor. 3. Construction technology: 3.1.1 Shaft recovery project 1, HZ-6B rock grab 2, double-sided hanging plate 3, slipform 15 fast 4, Feng Shui pipe 5, ram 6, safety ladder. 3.1.2 Ground recycling projects: 1. Concrete mixing station; 2. Chute; 3 .1.3 Construction sequence Slip-form hanging plate (ram, cable, feng shui pipe) sealing plate safety ladder of chute rock grab of concrete mixing station 4. Safety technical measures: shaft recovery: 4.1.1 Rock grab recovery: 1. Technical parameters of HZ-6B rock grab; Total weight of grab: 1192Kg; frame weight: 8,325kg; grab weight: 2,767kg2; equipment for recovering grab: 2.5m hoist is used to recover grab, and 16T stable car is used to recover frame. 3. Technical parameters of JZ16/1 sinking winch: rated pressure of wire rope: 16 N; Rope capacity of drum: 1M average speed of wire rope: fast .1 m/s; Slow speed: .5m/s; Wire rope diameter: φ 37 mm; Motor power: 37kw 4. Checking calculation of safety factor of steel wire rope: frame weight g1=mg=8325×9.8=81585N; Weight of φ 37 wire rope: g2(52m) =mg=2797×9.8=27415N; (in which: the nameplate of φ 37 steel wire rope has indicated that the mass of 52m steel wire rope is 2797kg) The total breaking force of 37 steel wire rope (F1): 83875n; n=F1/(g1+g2)=83875/(81585+27415)=7.69> 6.5. Grab recovery method: firstly, the L connecting device between the frame and the grab is released by the grab driver; Then hang a 5T lifting ring at the lifting point of the grab bucket, and at the same time, the electrician puts the double rope ring of steel wire rope with a length of 3m and a rope diameter of 18.5mm in the lifting ring; Finally, the electrician puts the rope ring on the hook of the hoist, and the 2.5-meter hoist lifts the grab onto the well. After reaching the wellhead, the wellhead bell man closes the manhole cover door, and then the wellhead bell man contacts the hoisting machine room to hold the grab at the speed of .1-.3m/s below the hoisting stage 4. At the same time, the comprehensive team personnel can pull the brown rope bolt with a length of 5 meters and a diameter of 2mm on the grab to the outside of the wellhead (leave the manhole cover door); When the grab reaches the edge of the wellhead, the electrician uses 5T loader to hoist the grab into the material yard. Recovery method of the frame: 1) First, the comprehensive team removes the wooden board at the mouth of the rock grab on the hanging plate, the safety rope of the frame, the U-shaped bolt and the two I-beams with the length of 14mm supporting the frame. 2) Secondly, the bell man on the panel will dot the wellhead bell man, and the wellhead bell man will dot the wellhead stable car group to make the frame leave the hanging panel. 3) Then, the comprehensive team will block the mouth of the rock grab on the hanging plate with a board with a thickness of 8mm (connect the board with the I-beam that fixes the rock grab with 8# iron wire). 4) In the process of lifting the frame, first, the comprehensive team takes two people to take a bucket to observe the lifting process of the frame (the bucket is always above the derrick). If the frame swings greatly and other abnormal conditions occur, the people in the bucket contact the wellhead signalman with the walkie-talkie, and the wellhead signalman points to the stable car group to stop the lifting of the frame; Then the steady driver operates the 16T steady car to slowly lift the frame. Stop the car-stabilizing operation when the frame is 3 meters away from the manhole cover door, and the comprehensive team will remove the board at the mouth of the rock grab on the sealing plate. When the frame is lifted above the sealing plate, the comprehensive team will nail the board at the buckle of the rock grab on the sealing plate with 7-inch nails; In the process of lowering several wells slowly, at the same time, the 25kw winch at the wellhead is used to slowly pull the frame to the open place at the edge of the wellhead and lay it flat on the ground. 5) Finally, the electrician will remove the hook on the 16T car-stabilizing wire rope, and the car-stabilizing driver will wind the remaining wire rope on the 16T car-stabilizing drum. At the same time, the rock grab driver and maintainer will decompose the rock grab, and finally the rock grab will be hoisted to the material group yard with 5T loader. Because the stable car belongs to the suspension equipment with short-time working system, it must work for 3 minutes during the lifting process and then stop for 3 minutes to reduce the temperature rise of the motor. So run-stop using. 6. Precautions for the driver when stabilizing the car: 1) When lifting the rock grab, it must be operated by the main driver and supervised by the assistant driver. 2) Pay attention to the swing of the wire rope at any time when lifting the rock grab. Stop the car immediately if the swing is too big. 3) Pay attention to the instructions of the ammeter on the electric control cabinet at any time when lifting the rock grab, and stop immediately if the pointer swings greatly; Stop the motor immediately when it has abnormal sound or high temperature. 4) Before driving, carefully check the electric control cabinet to make sure that the stable car can be used normally; Check the service brake and safety brake. 5) When the master controller is operating, it should be turned from LK-1 to LK-5 step by step, so that the car can be stabilized and accelerated slowly. 6) When the brake is released, the total clearance in the horizontal direction of the working brake is not more than 1 mm; When braking, the contact area between the brake belt and the brake wheel shall not be less than 8%. When the brake is released, the total clearance of the safety brake in the horizontal direction is not more than 3 mm; When braking, the contact area between the brake belt and the brake shall not be less than 85%. 7) Check the oil level in the turbine reducer until it is higher than the worm. Apply sufficient lithium-based grease to the rolling bearing of the reducer. 8) Short-term working system shall be implemented for the sinking winch, and it is not suitable for long-term continuous operation of hoisting. Each continuous operation time shall not exceed 2 hours. 9) Before the car is stabilized and lifted every time, the mechanical and electrical inspector must check the wear degree of the turbine and worm, and stop using it immediately if it exceeds the limit. 1) Sinking winch (the meshing area of the stable gear is ≧5% along the tooth length and ≧4% along the tooth height. Good lubrication, no cracks. Wear does not exceed 2% of the original tooth thickness). (Items 1, 2, 3, 4, 5, 6, 7, 8, 9, and 1 are the contents of other stable car inspections) 4.1.2 Slipform recycling 4.1.3 Suspension tray recycling 1. Suspension tray for stable car and relevant technical parameters: Suspension tray for stable car model: JZ-1/1. Car-stabilizing motor: voltage 38V, power 22kw；; Number of stable cars: 4; Relevant technical parameters of hanging plate; Weight of hanging tray: g1=mg=128×9.8=12544N (Note: 4 pieces; The nameplate of φ 31 steel wire rope has indicated that the mass of 52m steel wire rope is 192kg) 2. Checking calculation of safety factor of steel wire rope suspended by hanging plate: total breaking force of φ 31 steel wire rope (F1): 685× 9.8 = 59633n; Checking calculation of safety factor: n = f1/(G1+4g2) = 59633/{(12544+4× 18642)/4} = 11.9 > 6.3 Safety precautions: 1) During the whole work process, the assistant manager in charge of safety, electromechanical and production must be present and under the unified command of the stationmaster. 2) Security inspectors must investigate unsafe hidden dangers at the construction site. 5. Recovery method of hanging plate: 1) Before the hanging plate is recovered (no other facilities are allowed on the hanging plate), the rock grab has been recovered into the well, so it is necessary to adjust the plate. 2) The lifting process of the hanging plate is carried out by centralized control. That is, the four hanging plates suspend and stabilize the car at the same time. 3) Precautions: 1. The electrician shall place a certain number of 1A-A fuses in four electric control cabinets in advance to prevent the fuses from being blown out due to the load during the lifting of the hanging tray and replace them in time. 2, stable car must be operated by the main driver. One person operates and one person supervises. 3. The electrical repairman will open the door of the electric control cabinet in advance to deal with the fault in time. 4. At least one electrician with tools is present beside each stable car. 5. Pay attention to the instructions of the ammeter on the electric control cabinet at any time when lifting the hanging tray, and stop immediately if the pointer swings greatly; Stop the motor immediately when the sound is abnormal or the temperature is high.

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