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Safety operation skills related to coal mine tunneling workers-shotcrete operation procedures
Release time:
2023-01-06
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Safety operation skills related to coal mine tunneling workers-shotcrete operation procedures
Operation Regulations for Shotcrete Workers
(I) General Provisions
(1) Before taking up their posts, they must undergo safety training and pass the examination to obtain the post operation certificate.
(2) Earnestly study the relevant contents of the operation procedures, and master the construction technology, supporting methods, quality standards andWith awareness and ability of self-protection and mutual protection for construction safety precautions.
(3) Be able to master and maintain drilling and shotcrete machines and tools skillfully, and carry out injection anchor rod and shotcrete operations.
(4) Before work, the safety situation within the scope of work must be carefully checked, and problems found should be handled in time.
Preparation before (II) operation
(1) Check the permanent support, temporary support and safety facilities of the roadway from the outside to the inside in turn (shed by shed and row by row)to deal with potential safety hazards in a timely manner.
(2) Strictly implement the system of "knocking on the top and asking for the top" to find the live gangue and dangerous rock of the top. When looking for the top, use longHandle tools (find special tools for the top), top first and then help, personnel standing in a safe place, and there is a special person to monitor,At the same time, observe the retreat to ensure that the retreat is unimpeded.
(3) The gas inspector must carefully check whether the gas concentration of the construction roadway conforms to the Coal Mine Safety Regulations.Cheng "stipulates that problems should be dealt with immediately.
(4) Check whether all kinds of dust-proof facilities and personal protective equipment are in good condition and complete.Cables, pipelines, air ducts and various equipment shall be protected and covered.
(5) according to the roadway waist line and design size, check the size of the shotcrete section, anchor installation quality and goldWhether the network laying meets the design requirements, and any problems found shall be handled in time. For the uneven position of the shotcrete section,Try to level with a manuscript or a pneumatic pick. Use manuscripts or pneumatic picks to cut straight walls, clear out the jet base, and ensure that upto design depth.
(6) Check whether the spraying machine and pressure gauge are in good condition, connect the air pipe, conveying pipe and nozzle, and set them up properly.Lighting. Use special tools to clean up large pieces of gangue or materials in the shotcrete machine, fasten the friction plate, and send electricity for trial operation.Turn. The conveying pipe shall be straight without sharp bend; the joint shall be tight without air leakage. Non-antistaticThe plastic pipe is used as a conveying pipe.
(7) Spray thickness signs shall be installed on the vault of the roadway and the two gangs.
(III) shotcrete operating procedures
1. Spraying machine use sequence
Start-up sequence: boiling water → open air → power supply → feeding.
Shutdown sequence: stop feeding → power outage → wind outage → water outage. In case of special circumstances, the power must be cut off first.
2. Feeding operation
(1) Adopt manual feeding, which can be operated by 2~3. The feeding personnel will add the material into the hopper to achieve continuousUniform, appropriate speed, in order to reduce dust flying. When feeding, many people should coordinate with each other and pay attention to each other's shovel lifting.To prevent injury to personnel.
(2) The loading personnel shall control the admixture of the accelerator according to different injection requirements and the signal indication of the injection hand.into the amount, and in a timely manner to remove the large pieces of aggregate on the screen.
(3) When any abnormal situation is found in the feeding process, the feeding shall be stopped immediately and measures shall be taken to deal with it.
3. Jetting operation
(1) Before spraying, the roadway sides and rock faces within the spraying range must be washed with water.
(2) The injection sequence starts from the foundation, from bottom to top, from back to front, fill in the recess first, then level it, and then pressNormal operation is carried out.
(3) The spray operation is generally carried out by 2 people. The spray hand holds the spray nozzle for spray operation, and the deputy observes it.Injection situation and safety monitoring, timely use signals to indicate the injection position and direction, and be responsible for the connection in case of problems.Department and assist in processing.
(4) The sprayer shall master the spraying angle, and the sprayer shall strive to be vertical to the rock surface and lane side. Spray angle when spraying the wallIt is advisable to dip 10 ° ~ 15 ° below the degree, and the minimum elevation angle is 65 ° when spraying the top.
(5) When spraying, the spraying distance should be adjusted in time according to the wind pressure and rebound. Nozzle distance by sprayThe surface distance is generally 0.8~1.0m, the distance can be appropriately increased when the wind pressure is large, and can be appropriately reduced when the wind pressure is small,Adjust to the optimum distance according to the springback.
(6) The ring-drawn injection method is adopted, that is, the injected material is pressed by one and a half turns in a spiral shape from bottom to top along the transverse direction,Repeated movement, ring diameter to 200~250mm is appropriate.
(7) The spraying hand should control the water cement ratio, so that the spraying material is not white, flowing and the surface is shiny.(8) the thickness of shotcrete at one time cannot be too thick, the top is generally not more than 50mm, and the side is not more than 100mm; SuchIf the design requirements are not met once, the spray shall be carried out after at least 15 min.
(9) Pay attention to control the thickness of shotcrete. When pulling the wire, the wire shall not be eaten.
(10) In case of any abnormal situation such as pipe blockage during the injection process, the feeding personnel shall be notified in time with a signal, andThat is, stop feeding, stop the machine and stop the wind; knock the pipeline to open the wind and blow through, and hold down the nozzle during processing;If it still cannot be blown through, the pipeline should be disassembled,
(11) If the water from the rock surface is discharged, it can be treated by sealing, intercepting, guiding and blowing methods respectively.
(12) Under no circumstances shall the spout be directed against the person. Operators should wear protective glasses to prevent reboundDamage to the eyes.
(IV) shotcrete operation precautions
(1) The air and water pipe joints must be firmly connected to prevent disconnection and injury to personnel.
(2) When spraying, the operator should stand firmly and hold the spray gun head firmly to prevent it from tilting and hurting people.
(3) After shotcrete support, sprinkler curing shall be carried out according to the specified time, and the curing time shall not be less than 7 days.
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