First, the shotcrete support workers must master the roadway sections, support forms, and support technical parameters and quality standards specified in the operating procedures. They should be skilled in the use of work tools and be able to perform inspections and maintenance.
2. When the sprayer rotates, no hand or tool is allowed to enter the sprayer.
Third, shotcrete considerations
1. When the thickness of a shotcrete cannot meet the design requirements, it should be sprayed separately, but the double-spraying time interval should not exceed 2 hours. Otherwise, the sprayed surface should be flushed with high-pressure water.
2. In the event of over-excavation or cracks in the low-pit area, it is necessary to make up the spray and then spray normally.
3. It is forbidden to aim the sprayer at the person.
4. During the spraying process, if there is any failure such as blockage, stoppage of wind or power failure, the water gate should be closed immediately and the sprinkler head should be placed downwards to prevent water flow, for example, when the material is shut off; when the blockage is handled, the knocking method is used to clear the material pipe. No one is allowed in front of or near it.
5. During the spraying process, the pressure gauge of the spraying machine suddenly rises or falls. When the swing is abnormal, it shall be stopped and checked immediately.
6. Strictly carry out dust-removal and dust-falling measures when spraying, spray personnel should wear dust masks, latex gloves and glasses.
7. After the spraying work is completed, the spraying layer will spray water once per class within 7 days. After 7 days, the coal will be sprayed once a day for 28 days.
8. The aggregate of shotcrete should be mixed on the ground.
9, metal network connection buckle, network wire specifications in line with the operating procedures.
10. Regularly check the strength of concrete, and must repair and support unqualified sections.
Fourth, spraying machine operation preparation
1. Check whether the wind, water, electricity, and spray gun needed for construction are in good condition, whether there is any air leakage, water leakage, or leakage.
2. Check the temporary support, clean up the floating coal raft, and level the workplace.
3, according to the waist line inspection roadway hair section specifications, quality, clear base, digging the bottom, to deal with unqualified parts.
4. The conveying pipe should be straight and there should be no sharp bends. The joints must be tight and no air leakage is allowed. It is forbidden to use non-antistatic plastic tubes as feeding tubes.
Fifth, the spraying machine operation sequence
1. Prepare construction equipment and materials
2, safety and quality inspection, handling dangerous rock hanging
3, fill spray
4, hit the rod eye, pressure net, networking
5, double spray
6, check, correct the support quality, clean up the construction site.
7, spray concrete (1) open air, adjust the amount of water, air volume, to ensure that the wind pressure shall not be less than 0.4 MPa.
(2) Spray the hand to operate the nozzle and flush the rock face from above.
(3) Power transmission, spraying machine, mixer, spray gunning.
(4) Adjust the air volume and water volume again according to the feeding conditions to ensure that the spray surface has no dry spot or no runny.
(5) The sprayer sprays in order from the bottom to the top of the wall and the back arch.
(6) The nozzle should be sprayed as far as possible perpendicular to the spray surface, with an angle less than 70°.
(7) The nozzle is kept at a distance of 0.6-1.0m from the spray surface.
(8) When spraying, the trajectory of the nozzle should be in a spiral shape. According to the diameter of 200-300mm, the half circle of the circle can be uniformly moved slowly.
(9) At the end of shotcreting, the order of operation is to stop the water, stop the power supply, and finally close the wind after stopping the material.
Sixth, finishing work
1. After the spraying work is completed, remove the spray head, clean the water ring and the mortar or material inside and outside the sprayer, and wind up the wind water pipe.
2. Clean up and collect the rebounds, and use the clean materials in the work or use as aggregates for the pouring ditch.
3. Sprinkling water began to cure after 2 hours of spraying, and core strength was measured after 28 days.
4. After the spray is finished in each shift, the control switch handle will be turned to zero, and the lock is opened. The sprayer is used to clean the internal and external sanitation and prepare for the shift.
2. When the sprayer rotates, no hand or tool is allowed to enter the sprayer.
Third, shotcrete considerations
1. When the thickness of a shotcrete cannot meet the design requirements, it should be sprayed separately, but the double-spraying time interval should not exceed 2 hours. Otherwise, the sprayed surface should be flushed with high-pressure water.
2. In the event of over-excavation or cracks in the low-pit area, it is necessary to make up the spray and then spray normally.
3. It is forbidden to aim the sprayer at the person.
4. During the spraying process, if there is any failure such as blockage, stoppage of wind or power failure, the water gate should be closed immediately and the sprinkler head should be placed downwards to prevent water flow, for example, when the material is shut off; when the blockage is handled, the knocking method is used to clear the material pipe. No one is allowed in front of or near it.
5. During the spraying process, the pressure gauge of the spraying machine suddenly rises or falls. When the swing is abnormal, it shall be stopped and checked immediately.
6. Strictly carry out dust-removal and dust-falling measures when spraying, spray personnel should wear dust masks, latex gloves and glasses.
7. After the spraying work is completed, the spraying layer will spray water once per class within 7 days. After 7 days, the coal will be sprayed once a day for 28 days.
8. The aggregate of shotcrete should be mixed on the ground.
9, metal network connection buckle, network wire specifications in line with the operating procedures.
10. Regularly check the strength of concrete, and must repair and support unqualified sections.
Fourth, spraying machine operation preparation
1. Check whether the wind, water, electricity, and spray gun needed for construction are in good condition, whether there is any air leakage, water leakage, or leakage.
2. Check the temporary support, clean up the floating coal raft, and level the workplace.
3, according to the waist line inspection roadway hair section specifications, quality, clear base, digging the bottom, to deal with unqualified parts.
4. The conveying pipe should be straight and there should be no sharp bends. The joints must be tight and no air leakage is allowed. It is forbidden to use non-antistatic plastic tubes as feeding tubes.
Fifth, the spraying machine operation sequence
1. Prepare construction equipment and materials
2, safety and quality inspection, handling dangerous rock hanging
3, fill spray
4, hit the rod eye, pressure net, networking
5, double spray
6, check, correct the support quality, clean up the construction site.
7, spray concrete (1) open air, adjust the amount of water, air volume, to ensure that the wind pressure shall not be less than 0.4 MPa.
(2) Spray the hand to operate the nozzle and flush the rock face from above.
(3) Power transmission, spraying machine, mixer, spray gunning.
(4) Adjust the air volume and water volume again according to the feeding conditions to ensure that the spray surface has no dry spot or no runny.
(5) The sprayer sprays in order from the bottom to the top of the wall and the back arch.
(6) The nozzle should be sprayed as far as possible perpendicular to the spray surface, with an angle less than 70°.
(7) The nozzle is kept at a distance of 0.6-1.0m from the spray surface.
(8) When spraying, the trajectory of the nozzle should be in a spiral shape. According to the diameter of 200-300mm, the half circle of the circle can be uniformly moved slowly.
(9) At the end of shotcreting, the order of operation is to stop the water, stop the power supply, and finally close the wind after stopping the material.
Sixth, finishing work
1. After the spraying work is completed, remove the spray head, clean the water ring and the mortar or material inside and outside the sprayer, and wind up the wind water pipe.
2. Clean up and collect the rebounds, and use the clean materials in the work or use as aggregates for the pouring ditch.
3. Sprinkling water began to cure after 2 hours of spraying, and core strength was measured after 28 days.
4. After the spray is finished in each shift, the control switch handle will be turned to zero, and the lock is opened. The sprayer is used to clean the internal and external sanitation and prepare for the shift.
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