1. The shotcrete spray thickness should be no less than 2cm, and the shotcrete thickness should be 3~5cm.
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 spraying the ash body to reach the initial setting, the sprinkler will immediately begin to maintain health 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.
