First, the construction process of foundation pit spraying and spraying machine construction process: After the excavation of the slope, repair the slope - interposing and installing the steel frame - hanging wire mesh - spraying the slurry.
The diameter of 14mm steel reinforcement 1500mm @ 1500 * 1500mm distribution, insert soil layer 1400mm, exposed 100mm. The keel is 6*1500mm*1500mm in diameter. Longitudinal and transverse use of surface-mounted 8# wire diameter 2mm galvanized steel wire mesh (mesh 20*20mm) and shotcrete, spray wet process using wet, coarse aggregate particle size of 5-10mm, surface layer using two injection, ensure the edge Slope safety.
Second, the construction of the foundation pit gunning sprayer Note the thickness of the shotcrete should not be less than 2cm, and the thickness of the shotcrete should be 3~5cm.
The joint around the shotcrete or shotcrete protection and the protective slope shall be strictly closed, and a small water intercepting ditch of 20×20 cm may be made at the top, and the chiseling may be embedded in the rock formation, the embedded depth is not less than 10 cm, and the connection is The slope is smooth. Slope protection Both sides of the chisel are embedded in the slope rock formation at least 10cm.
When weathering of slope protection rocks is severe, 1～2cm in height and 40cm in width should be made.
Before the shotcrete and shotcrete, the gravel on the slope surface should be clear and washed with water.
Before mechanical spraying and shotcrete operation, test spraying shall be carried out 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.
The spraying operation should be from the bottom up, the spray gun nozzle should be perpendicular to the slope, and keep a distance of about one meter on the slope.
In order to prevent clogging, the length of the feeding pipe is 20 to 30m, and its injection 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 uniform water and dry mix. mixing.
After the sprayed gray body reached the initial setting, it immediately began to sprinkling water for 7 to 10 days.
Shotcrete and shotcrete protection works should be regularly checked for maintenance. Weeds should be promptly clear. When cracking, grouting should be timely and the spray should be removed as soon as possible.
Jet operations are strictly prohibited during the freezing season and above the weather.
The diameter of 14mm steel reinforcement 1500mm @ 1500 * 1500mm distribution, insert soil layer 1400mm, exposed 100mm. The keel is 6*1500mm*1500mm in diameter. Longitudinal and transverse use of surface-mounted 8# wire diameter 2mm galvanized steel wire mesh (mesh 20*20mm) and shotcrete, spray wet process using wet, coarse aggregate particle size of 5-10mm, surface layer using two injection, ensure the edge Slope safety.
Second, the construction of the foundation pit gunning sprayer Note the thickness of the shotcrete should not be less than 2cm, and the thickness of the shotcrete should be 3~5cm.
The joint around the shotcrete or shotcrete protection and the protective slope shall be strictly closed, and a small water intercepting ditch of 20×20 cm may be made at the top, and the chiseling may be embedded in the rock formation, the embedded depth is not less than 10 cm, and the connection is The slope is smooth. Slope protection Both sides of the chisel are embedded in the slope rock formation at least 10cm.
When weathering of slope protection rocks is severe, 1～2cm in height and 40cm in width should be made.
Before the shotcrete and shotcrete, the gravel on the slope surface should be clear and washed with water.
Before mechanical spraying and shotcrete operation, test spraying shall be carried out 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.
The spraying operation should be from the bottom up, the spray gun nozzle should be perpendicular to the slope, and keep a distance of about one meter on the slope.
In order to prevent clogging, the length of the feeding pipe is 20 to 30m, and its injection 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 uniform water and dry mix. mixing.
After the sprayed gray body reached the initial setting, it immediately began to sprinkling water for 7 to 10 days.
Shotcrete and shotcrete protection works should be regularly checked for maintenance. Weeds should be promptly clear. When cracking, grouting should be timely and the spray should be removed as soon as possible.
Jet operations are strictly prohibited during the freezing season and above the weather.
Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.jmdilinlighting.com