Safety measures for coal mine silo anti-drilling rig construction
To meet the requirements of the construction of the mine, to be carried out smoothly in the coal mine coal bunker Anti well construction engineering, coal bunker hole using Reverse Drilling rig guide, reaming construction. Construction is carried out by Engineering Co., Ltd.
The drilling rig used in this construction is the ZFYD1200 anti-drilling rig.
Second, technical parameters
The pilot hole has a diameter of 200 mm, a reaming diameter of 1200 mm, and a bore angle of 90°.
Third, the construction period
The completion period from the drilling of the rig to the completion of the hole expansion of the coal bunker is expected to be 20 days.
Fourth, transportation requirements
(1) Before the downhole, the equipment such as the drilling rig should be firm and reliable, and the main gearbox and the flatbed car sealer should be fixed.
(2) According to the construction orientation, installation sequence and transportation route, it is determined that the host can allow the downhole after the front and rear direction of the ground transportation route and the order of other equipment vehicles.
(3) When using winch transportation, special personnel must be arranged to hook with the handlebar to ensure that the drilling rig does not collide during transportation and does not damage the drilling rig components.
(4) Before the rig is transported in the upper and lower mountains, special personnel must be arranged to carry out comprehensive inspections on the winches, wire ropes, signals and safety facilities of the upper and lower mountains, and confirm that they meet the lifting requirements before they can be transported.
(5) Strictly implement the system of “no pedestrians, no pedestrians†in the transportation of upper and lower mountains. The upper and lower signals must check the sealing situation of the vehicles and find out the problems in time.
(6) The winch driver and the signal shall strictly implement the responsibility system and operation procedures of this work.
(7) Transportation route: main inclined shaft → coal bunker lower chamber.
(8) Other transportation measures shall be implemented in the relevant provisions of the General Technical Safety Measures for Coal Mines to Improve Transportation.
Five, drilling machine installation requirements
(1) After the rig is transported to the site in the order of the auxiliary pump station, main pump station, main engine, drill pipe truck and tool cart of the electrical equipment, find the host position and lock the car with the scraper conveyor chain.
(B), find the host location, use the rail rail to fix the host flatbed.
(3) Connect the left and right foot boards to the base frame of the main unit.
(4) According to the hydraulic system diagram, connect the inlet and outlet pipes of the pump station, the operation console and the main action mechanism of the main engine, and add oil to the fuel tank.
(5) Connect the inlet and outlet oil pipes of the auxiliary unloader to the turning cylinder of the flatbed.
(6) Install the switch, lay the cable, connect the switch, and connect the motor to the fire so that the switches are in the power-off lock state.
(7) Check the hydraulic pipeline and power supply line, confirm the connection and the setting value is correct, and then start the auxiliary motor (11KW) control console on the unloading rod cylinder control handle, push to the “push†position, control the turning cylinder slow Slowly raise the flap and hold the mainframe.
(8) Loosen the flatbed truck railing device, and find the center position of the coal bunker together with the mainframe, connect the flatbed truck and the left and right footboards, attach the bolts and fasten the bolts, and re-clamp the flatbed truck rails.
(9) Turn off the auxiliary motor, remove the turning cylinder oil pipe, and connect it to the auxiliary unloader. Be careful not to connect the import and export.
(10) Install the manipulator and lifting device.
(11) Connect the water pump and the cooler into and out of the water pipe.
Six, drilling machine commissioning
(1) Start the auxiliary motor (jog) to observe whether the auxiliary motor is turning correctly.
(2) Adjust the relief valve of the charge pump outlet, observe the pressure gauge on the side of the fuel tank, the pressure gradually rises to 2.5Mpa, stop the adjustment, and then observe the pressure gauge of the console, the pressure is about 2.5Mpa.
(3) Rotate the oil return throttle valve to the minimum position, observe the pressure gauge on the other side of the pump station fuel tank, adjust the outlet relief valve of the auxiliary pump, observe the pressure gauge of the control console, the pressure is 28Mpa, stop the adjustment, and then return The oil throttle valve is rotated to the maximum position.
(4) Unscrew the main cylinder exhaust plug (three), push the “spindle fast lifting†handle to the “down†position until the reduction box is lowered to the lowest end, then tighten the exhaust plug, and then “fast lift†Move the handle to the "up" position until the gearbox descends to the top, repeat "up, down" twice and place the handle in the "stop" position.
(5) The adjustment of the rapid and slow lifting of the main cylinder is controlled by the speed regulating valve so that the movement of the main cylinder changes sensitively.
(6) Check that the robot is stopped at a certain position, push the “clamping rod cylinder†handle to the “clamping positionâ€, adjust the outlet valve of the joint valve, and observe the pressure gauge. When the pointer shows 15Mpa, stop the adjustment. Then, return the “clamping rod†handle to the “stop†position, check if the jaws are locked, and then pull the handle to the “release†position. Whether the jaws are open.
(7), jog the motor, check whether the steering is correct, and depends on whether the reverse direction of the drive head is correct. When the drive head rotates, release the handle and the spindle can stop. If the stop is unstable, the variable mechanism of the main oil pump must be adjusted until the handle is released and the spindle stops.
(8) Stop the main pump first, then stop the auxiliary pump to stop the pump station.
(9) Observe the fuel tank level gauge. When the hydraulic oil height is less than 80% of the tank height, it should be refueled to the fuel tank in time.
(10) Adjust the “return oil throttle valve†to the “large position†control valve to “stop positionâ€, and the commissioning is completed.
Seven, drilling machine construction
(1) Preparation before opening the hole
1. The measurement department of the project department must first locate the coal bunker center, give the relevant crosshairs, and issue technical disclosures.
2. Cast concrete foundation on site, the concrete foundation size is (length × width × thickness) 2.5 × 2.5 × 0.3m. The scum should be cleaned before pouring and the solid bottom should be found. When pouring, leave a 0.2×0.2m slag drain in the middle. The base plane is 0.1 m or flat from the rail surface. (see figure below)
3. One 120 switch and two 80 switches are set on site. The motor power is 45KW for the main pump motor, 5.5KW for the auxiliary pump motor and 7.5KW for the pump motor. The switch is installed about 10m away from the center of the drill.
4. Set the air duct and water pipe about 5 meters away from the center of the drill hole, and set the diameter of the three outlets to 25mm.
5. The track is laid to the center hole of the coal bunker at 1m.
6. 1-2 lifting bolts are placed on the top plate at the center hole position, and the tensile strength is not less than 5 tons.
7. After the rig base is installed on the foundation, it needs to be fixed by 8 anchors. The tensile strength of each anchor is not less than 5 tons.
8. The site needs to dig a 1 meter square pool to communicate with the slag drain, and use the water supply pump to drain the slag.
9. The large bit is transported to the level below the downhole point.
10. Short-circuit drill pipe and tri-cone bit should be connected in advance.
11, all drill rods should be carefully checked again, there are gaps, cracks are strictly prohibited.
12. Prepare the silk fat.
13. All drill pipe threads and outer walls are cleaned up, and any raised burrs must be flattened.
(2) Construction of the opening guide hole.
1. Start the auxiliary pump and the main pump after the start, and run for 3-5 minutes without load.
2. Raise the drive head to the highest position.
3. Lift the tri-cone bit that has been connected to the short-rod in advance to the swing radius of the manipulator.
4. Manipulate the manipulator so that it is placed at the short drill pipe of the tricone bit, and continue to swing to the center of the drive head of the drill, lower the drive head, control the descent speed and speed, and make the wire sleeve and the short drill pipe Return to the original position.
5. The guide sleeve is placed on the short drill pipe, and the snap ring is clamped so that the outer spline of the guide sleeve engages with the inner spline on the base.
6. The surveyor measures the verticality of the short drill pipe to ensure that the guide hole is tilted correctly.
7. Start the water pump to drill the water supply to the three-toothed wheel. The water supply is 0.6m3/min or more, and the pressure is 0.6-0.9MPa, ensuring the timely discharge and cooling of the drill bit.
8. Adjust the drill speed to about 15r/min, and the axial pressure is generally controlled between 5-15KN, and the hole is opened accurately and slowly.
9. After the short drill is drilled, the drive head is raised, the drill guide sleeve is removed, and the clamped hand is mounted on the second bolt at the short drill pipe, so that the drive head is lowered to the fitter and the workbench. All the internal splines are engaged. The wrench that controls the spindle to turn over is operated so that the drive head is reversed until the thread is disengaged.
10. According to the order of adding the drill pipe, add the first guide drill pipe, add a guide drill pipe every other ordinary drill pipe, and use two guide drill pipes.
11, to protect the orifice, to prevent metal-based objects into the bore damage tricone bit.
12. Continue drilling into the through hole.
(3) Reaming construction
1. After the guide hole is through the hole, use the auxiliary (pad fork) at the lower port to remove the tricone together with the short drill pipe.
2. Transport the reaming drill to the lower port and center the mandrel with the centerline of the drill pipe.
3. Check whether the reaming drill's water spray hole is unblocked, wipe the mandrel thread of the reaming drill bit and the drill rod screw, and apply silk grease.
4. The construction personnel withdraw from the reaming drill 5m outside the range, and notify the upper operator to lower the drill pipe by telephone, and adjust the rotation speed to slowly lock the reaming drill bit.
5. Start lifting the drill bit.
6. Normal pressure parameters when reaming:
Sub pump pressure: 5-8MPa
Main pump pressure: 5-12MPa
7. It is strictly forbidden to reverse the drive head during the hole expansion process (except for stopping the drill pipe).
8. Expand to the last two drill pipes. The operator should pay close attention to the basic conditions to ensure that the last rod is safely expanded.
Eight, the removal of the rig
(1) After the hole is reamed, lift the lifting nut onto the reaming bit mandrel, lift the hook joint onto the driving head wire sleeve, and tighten to prevent the tripping.
(2) Use a 40-type scraper conveyor chain and a special pad fork to lower the reaming drill.
(3) After the large drill bit is loosened to the lower mouth, when the personnel unload the drill bit and disassemble the drill bit at the lower mouth, the upper mouth of the coal slippery eye must be tightly sealed to prevent the stone from falling into the wounded.
(4) After the reaming drill is lowered, the robot is removed.
(5), the drive head is lowered to remove the water pipe.
(6) Connect the inlet and outlet oil pipes of the auxiliary unloader to the turning cylinder.
(7) The card is tightly transported to the truck rail, and the connection between the transport truck and the host is firm.
(8), operate the turning cylinder and slowly lower the main unit.
(9) Dismantle the hydraulic pipelines, and use the cloths for the inlet and outlet of each oil pipe and grease nozzle to prevent the entry of debris.
(10) Dismantle electrical equipment.
(11) Dismantle the basic frame and the bottom beam. When dismantling, the construction personnel should wear seat belts, and after dismantling, the coal-filled eyes should be tightly packed with steel plates.
Nine, safety technical measures
(1) The project department is responsible for setting up a telephone on the upper and lower sides of the coal bunker to facilitate the connection between the upper and lower ports.
(2) During the normal reaming period, no one is allowed within 30m of the bottom of the coal bunker.
(3) When the hole is reamed, the project department is responsible for cleaning the reaming meteorite.
(4) The officer who produces the reaming shall not exceed the height of 2/3 of the lower chamber of the coal bunker. When the height of 2/3 is reached, the reaming work shall be stopped, and the construction workers shall be notified by telephone to start the exit. During the period, the anti-drilling rig shall not be drilled. After the evacuation of the slate personnel is ≥30m, the coal bunker may be notified to return to the construction work of the anti-well rig and cycle to the end of the project.
(5) When drilling, the drilling construction personnel must designate the person in charge of the construction, specifically responsible for the safety of the construction personnel, and do autonomous security and mutual security during the construction.
(6) When the guiding hole is 10m before the through hole, the project department must send people to the position of the through hole 30m before and after the station, set the warning, and hang the 'drilling construction, prohibit pedestrians' sign, prohibiting anyone from passing or Stay.
(7) The drilling construction personnel must report the drilling situation to the dispatching room of the project department every shift.
(8) During construction, it is strictly forbidden for the driller to touch the rotating parts and electrical equipment by hand.
(9) When each class enters the construction site, it is necessary to knock on the top and remove the live rock, and then work without any complete hidden danger. After the completion of the reaming, the project department shall immediately arrange for the personnel to block the upper mouth of the drilled coal bunker to prevent the falling object from injuring people.
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