Concrete slope spraying machine grass seed spraying and precautions
How to operate the shotcrete of slope protection shotcrete machine? What are the safety precautions for slope protection shotcrete machine? Zhengzhou Zhongke shotcrete machine manufacturer introduces the operation instructions and precautions of slope protection shotcrete shotcrete.
1. Applicable conditions of slope protection spraying machine:
1. For rock slopes that are hard to be weathered but have not been severely weathered, in order to prevent further weathering, spalling and sporadic blocks, spraying and spraying concrete are used to form a protective layer on the slope.
2. It can be used on high and steep slopes, especially for the slopes where the upper rock layer is broken and the lower rock layer is intact and the slopes that require large-area protection and are more concentrated. The protection by spraying or spraying concrete is more economical.
3. Clay rock slopes with poor diagenesis should not be used.
4. It is suitable for dry slopes where groundwater is not developed.
2. Material requirements for slope protection spraying machine:
1. Cement: Use ordinary portland cement no less than 425.
2. Lime: the newly-burned ash from the kiln is used, which is not needed for under-fire and over-fire.
3. Sand: Gravity spraying uses pure fine sand with a particle size of 0.1-0.25mm, mechanical spraying and spraying concrete uses pure medium-coarse sand with a particle size of 0.25-0.5mm, the water content should not exceed 5%, and the water content 4-6% is suitable.
4. Pebbles: Use pure pebbles or crushed stones, the maximum particle size should not be greater than 25mm, and the particles greater than 15mm should be controlled below 20%, and the content of flakes and needles should not exceed 15% by weight.
3. Matters needing attention in the construction of slope protection spraying machine:
1. The thickness of shotcrete should be no less than 2cm, and the thickness of shotcrete should be 3 ~ 5cm.
2. The connection between the periphery of the shotcrete or shotcrete protection and the protective slope should be strictly closed. A small intercepting ditch of 20 × 20cm can be made on the top, and it can also be chiseled into the rock layer, and the embedding depth is not less than 10cm The slope is smooth. Slotted grooves on both sides of the slope protection are embedded in the slope rock layer at least 10cm.
3. When the weathering of the slope protection rock is severe, it should be 1 ~ 2cm high, the top width is 40cm, and the protective skirt when No. 5 cement mortar is sliced.
4. Before grouting and spraying concrete, clear up the gravel floating soil and wash it with water.
5. Test spraying should be carried out before mechanical spraying and concrete spraying to adjust the moderate water-cement ratio. If the water-cement ratio is too small, the surface of the ash is dark in color, dry spots appear, the amount of rebound is large, and the dust is flying. If the water-cement ratio is too large, the surface of the gray body is wrinkled, brushed, sliding, or even flowing. The gray body is sticky, the surface is smooth and smooth, the aggregate is evenly distributed, and the amount of rebound is small.
6. The spraying operation should be from bottom to top, the spray gun nozzle should be perpendicular to the slope, and maintain a distance of about one meter on the slope.
7. In order to prevent clogging, the length of the conveying pipe is preferably 20-30m, its spray working pressure is 1.5-1.7MPa, and the nozzle water supply pressure (2.5MPa) is 0.5-1.0MPa higher than the working pressure to ensure water and dry mixing. The materials are mixed evenly.
8. After the sprayed concrete reaches the initial setting, immediately start to sprinkle water for health, lasting 7 to 10 days.
9. The spraying and spraying concrete protection project should be regularly checked and maintained, the weeds should be clear in time, the cracks should be grouted in time, and the spraying should be repaired as soon as possible.
10. The spraying operation is strictly prohibited in the icy season and greater than the weather.
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