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Safety operation skills related to coal mine tunneling workers-grouting safety operation skills
Release time:
2023-01-06
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Safety operation skills related to coal mine tunneling workers-grouting safety operation skills
Grouting safety operation skill
(I) scope of application
This operation procedure is applicable to the grouting work of capital construction mine and production mine.
(II) induction conditions
(1) Coal mine waterproof, fire prevention grouting workers must be on-the-job training before taking up their posts, and can only be qualified after passing the examination.Post.
(2) Grasp the quality standards of underground waterproofing and fire prevention grouting. Understand water and sand filling, hole sealing, roof and floorPre-grouting, water plugging process and precautions.
(III) safety regulations
(1) the implementation of the "coal mine safety regulations" and "mine hydrogeological regulations" of the relevant provisions, in strict accordance with the notePulp operation procedures.
(2) Paste and grouting workers should wear protective glasses and masks;Safety belt must be worn during well construction.
(IV) the operation of preparing cement slurry
(1) The opening of various equipment of the pulp making system shall be controlled and managed centrally. The startup sequence is usually the firstStart the medium-pressure pump, deliver clean water, then start the belt ash conveyor or spiral ash conveyor and mixer, and finally start.The ash storage bin starts to feed. If additives need to be added, they can be added in proportion in the mixing tank. Shutdown of pulp making systemIn the opposite order of starting, first turn off the ash storage bin and wait for all the ash materials on the adhesive tape or in the spiral groove to enter the stirring.After the mixer, turn off the fresh water pump and feeder, and finally turn off the mixer.
(2) The grouting system shall be equipped with at least two adjustable grouting pumps, one of which is for standby; two adjustable water glass pumpsTaiwan, one of which is for standby; equipped with a clean water tank and a water glass blending tank. Grouting pump taps shall be wrappedthrough the screen. 50mm or 42mm diameter drill pipe can be used for common grouting pipeline. To each grouting orificeThe pipeline of the device shall be a high-pressure hose with a diameter of 25~50mm, and the hose shall be connected with a quick connector. Selection of glueThe maximum pressure that the tube can withstand should be more than twice the maximum pump pressure.
(3) The operation of the grouting system should be managed centrally together with the grouting system.Pay attention to observe the pump pressure, and immediately notify the construction commander if any abnormality is found. During the grouting process, the faucet should be shaken all the time,Prevent clogging. The grouting pipeline shall be inspected by special personnel.
(V) pulping system parameters
All parameters and display instruments of the pulping system shall be recorded by a special person. The requirements are as follows:
(1) During the grouting process, the ash loading amount, water volume, pump volume, pump pressure, slurry flow rate and slurry shall be recorded regularly.Density, orifice pressure, additive amount, water glass amount, etc., are archived as original grouting data.
(2) When there is no pulping pool on the ground and the slurry concentration is not easy to measure, regular sampling and measurement shall be taken at the underground slurry outlet.Mud concentration.
(VI) downhole grouting operation
1. Preparation before downhole grouting
(1) Grouting workers should understand the purpose of grouting work, grouting workload and pipeline system within the scope (packageIncluding pipe diameter, joint mode, valve model and installation location, etc.), complete with pipe tongs, wrenches, taps, pliers,Wire and other tool materials.
(2) After the grouting worker arrives at the work place, first check the top and side support of the grouting place. Is there anySafety factors should be dealt with immediately; then check the condition of grouting equipment and piping system, and deal with problems in time.
(3) Before grouting, first flush the pipeline (or drill hole) with water for pressure test.3~5 times of the sum of pore volume and pipe volume. Check whether the grouting hole is unblocked and whether there is blockage, so asLi grouting.
(4) After the water pressure is over, if the water pressure meets the requirements, the appropriate slurry can be selected according to the unit water absorption.Liquid start grouting. During the grouting process, it is necessary to observe whether the underground slurry runs, whether the water level of other boreholes is abnormal, and whether there is anyPaste string phenomenon.
(5) The slurry ratio and grouting duration shall be adjusted at any time according to the situation in grouting. Such as drillingIn case of continuous pressure rise, grouting shall be continued until the end standard is reached.
(6) When the equipment operation is abnormal (such as sudden pressure increase, grouting pipe beating violently, etc.), notePulping personnel shall stop the machine immediately for inspection and treatment.
2. Grouting operation in fire area and goaf
(1) First, the gas inspector will inspect on site, and then enter the work site. According to the design scheme and workloadThe arranged grouting hole number and the amount of grouting to be injected in each borehole are used for operation.
(2) Before grouting, flush the borehole first, the amount of water should be gradually increased, and the flushing time of each hole is generally not less20min. After the water flow is smooth, connect the grouting pipe, open the gate valves everywhere, and record the readings of the flowmeter, and thenInform the pulping station to deliver the pulp.
(3) During grouting, grouting workers should pay close attention to the situation of pipelines and valves. Plugging or pipe foundIn case of slurry leakage, the slurry delivery shall be stopped at first, and a person shall be assigned to close the last valve before treatment.For the drilling hole under grouting, if the grouting is found to be abnormal, the grouting shall be suspended and the pipeline shall be washed with clean water.
(4) When grouting, do not stay near the high-pressure hose to prevent the pipe from collapsing and hurting people.
(5) Try to dismantle the pipe without slurry water. When dismantling the pipe in the presence of slurry water, the flat connectionThe pipe loosens the square screws first, the hanging pipe loosens the screws of the help first, and covers the flange with rubber, etc,Prevent water spray from hurting people.
(VII) considerations
(1) the grouting process to do the following checks: ① check the size of the water, water temperature, harmfulGas, etc., and make records;Good conditions, the smooth flow of the ditch, etc.
(2) Before stopping grouting, the ground pulping station must be notified to stop sending slurry, and the slurry shall be closed for 15~20min,Inject the tube memory slurry completely into the borehole. Close the grouting hole valve first, and then immediately flush the hole with clean water,The flushing time is generally not less than 20min (small water first and then large water). After punching, all pipelines, valves, etc.Good.
(3) When grouting in the return air flow, there must be a gas inspector on-site inspection.
(IV) Final Work
(1) Site arrangement shall be done well before leaving work, and equipment shall be managed according to regulations.
(2) After the work is finished, the work on duty must be reported to the dispatching personnel on duty. To verify the classThe actual amount of injection, and the grouting amount and working conditions are recorded in the "Grouting Log" in detail ".
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