How to operate slope protection spraying machine? Henan Hao Li sprayer manufacturers introduce the slope shot mortar shotcrete instructions and precautions.
First, slope protection mortar application conditions 1, the hard weathering, but has not been severely weathered rock slope, in order to prevent further weathering, spalling and sporadic pieces, using spray and shotcrete, so that the formation of the slope A protective layer.
2. It can be used on high and steep slopes, especially for the fractures in the upper rock layer and the complete rock slopes in the lower part, and slopes that require large-area protection and more concentration. The use of shotcrete or shotcrete protection is more economical.
3. It is inappropriate to use clay rock slopes with poor diagenesis.
4. It is applicable to slopes where groundwater does not develop relatively dry.
Second, slope spray mortar material requirements 1, cement: the use of ordinary Portland cement not less than 425.
2. Lime: The block ash burned through the new kiln is used, and neither fire nor fire are used.
3, sand: gravitational spray using pure fine sand, particle size 0.1 ~ 0.25mm, mechanical shotcrete and shotcrete using pure medium coarse sand, particle size of 0.25 ~ 0.5mm, moisture content shall not exceed 5%, moisture content 4 to 6% is appropriate.
4. Pebbles: pure pebbles or gravel, the maximum particle size shall not be greater than 25mm, particles larger than 15mm shall be controlled below 20%, and the content of flake and acicular particles shall not exceed 15% by weight.
Third, slope protection shotcrete construction precautions 1, shot thickness to not less than 2cm is appropriate, shotcrete thickness to 3 ~ 5cm is appropriate.
2. The joint of shotcrete or shotcrete protection and the protective slope should be closed strictly. It can be used as a small water interception trench of 20×20cm at the top, and can also be embedded in rock formations with a chiseling depth of not less than 10cm. The convergence is smooth. Slope protection Both sides of the chisel are embedded in the slope rock formation at least 10cm.
3. When weathering of slope protection rocks is severe, 1～2cm high, top width 40cm should be made, and the 5th cement mortar should be used for skirt protection.
4. Before the shotcrete and shotcrete, the gravel on the slope surface shall be clear and washed with water.
5, mechanical spraying and shotcrete should be sprayed before the trial operation to adjust the moderate water-cement ratio. When the ratio of water to cement is too small, the gray surface is dark in color, dry spots appear, the rebound is large, the dust is flying high, and the water-cement ratio is too large, the surface of the gray body is wrinkled, napped, slipped, or even flowed, and the water-cement ratio is moderate. The gray body becomes slimy, the surface is smooth, the aggregate is evenly distributed, and the springback is small.
6. The spraying operation should be from the bottom up, the nozzle of the spray gun should be perpendicular to the slope, and keep a distance of about one meter on the slope.
7, in order to prevent clogging, the length of the feeding pipe is 20~30m, the spraying working pressure is 1.5~1.7MPa, the nozzle water supply pressure (2.5MPa) is 0.5~1.0MPa larger than the working pressure to ensure the water and dry mixing. Mix evenly.
8. After the sprayed concrete reaches the initial setting, it will immediately begin to sprinkling water for 7 to 10 days.
9. Shotcrete and shotcrete protection works should be regularly checked and repaired. Weeds should be promptly clear. When cracking, timely grouting and jointing should be performed.
10. Spraying operations are strictly prohibited during the freezing season and above the weather.
First, slope protection mortar application conditions 1, the hard weathering, but has not been severely weathered rock slope, in order to prevent further weathering, spalling and sporadic pieces, using spray and shotcrete, so that the formation of the slope A protective layer.
2. It can be used on high and steep slopes, especially for the fractures in the upper rock layer and the complete rock slopes in the lower part, and slopes that require large-area protection and more concentration. The use of shotcrete or shotcrete protection is more economical.
3. It is inappropriate to use clay rock slopes with poor diagenesis.
4. It is applicable to slopes where groundwater does not develop relatively dry.
Second, slope spray mortar material requirements 1, cement: the use of ordinary Portland cement not less than 425.
2. Lime: The block ash burned through the new kiln is used, and neither fire nor fire are used.
3, sand: gravitational spray using pure fine sand, particle size 0.1 ~ 0.25mm, mechanical shotcrete and shotcrete using pure medium coarse sand, particle size of 0.25 ~ 0.5mm, moisture content shall not exceed 5%, moisture content 4 to 6% is appropriate.
4. Pebbles: pure pebbles or gravel, the maximum particle size shall not be greater than 25mm, particles larger than 15mm shall be controlled below 20%, and the content of flake and acicular particles shall not exceed 15% by weight.
Third, slope protection shotcrete construction precautions 1, shot thickness to not less than 2cm is appropriate, shotcrete thickness to 3 ~ 5cm is appropriate.
2. The joint of shotcrete or shotcrete protection and the protective slope should be closed strictly. It can be used as a small water interception trench of 20×20cm at the top, and can also be embedded in rock formations with a chiseling depth of not less than 10cm. The convergence is smooth. Slope protection Both sides of the chisel are embedded in the slope rock formation at least 10cm.
3. When weathering of slope protection rocks is severe, 1～2cm high, top width 40cm should be made, and the 5th cement mortar should be used for skirt protection.
4. Before the shotcrete and shotcrete, the gravel on the slope surface shall be clear and washed with water.
5, mechanical spraying and shotcrete should be sprayed before the trial operation to adjust the moderate water-cement ratio. When the ratio of water to cement is too small, the gray surface is dark in color, dry spots appear, the rebound is large, the dust is flying high, and the water-cement ratio is too large, the surface of the gray body is wrinkled, napped, slipped, or even flowed, and the water-cement ratio is moderate. The gray body becomes slimy, the surface is smooth, the aggregate is evenly distributed, and the springback is small.
6. The spraying operation should be from the bottom up, the nozzle of the spray gun should be perpendicular to the slope, and keep a distance of about one meter on the slope.
7, in order to prevent clogging, the length of the feeding pipe is 20~30m, the spraying working pressure is 1.5~1.7MPa, the nozzle water supply pressure (2.5MPa) is 0.5~1.0MPa larger than the working pressure to ensure the water and dry mixing. Mix evenly.
8. After the sprayed concrete reaches the initial setting, it will immediately begin to sprinkling water for 7 to 10 days.
9. Shotcrete and shotcrete protection works should be regularly checked and repaired. Weeds should be promptly clear. When cracking, timely grouting and jointing should be performed.
10. Spraying operations are strictly prohibited during the freezing season and above the weather.
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