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What are the requirements for concrete spraying? Before the work of the spraying machine, the old tape shall be laid on the spraying site to collect the rebound material. The rebound rate shall not exceed 15%. The injection sequence of the spraying machine shall be preceded by a wall and arched from the bottom to the top of the wall base. The spray gun head and the sprayed surface should be kept as perpendicular as possible. The vertical distance between the spray gun head and the sprayed surface is 0.8M-1.0M. Artificial mixes use tidal mixes. Cement, sand and gravel should be thoroughly mixed and mixed three times to make them even.
When spraying, the spraying pressure of the spraying machine is 0.4MPA, the water pressure should be higher than the wind pressure by 0.1MPA, and the amount of water added is controlled by the shooter's experience, and the water-cement ratio is 0.4-0.5. In the spraying process of the spraying machine, according to the change of the discharging material, the amount of water supply is adjusted in time to ensure accurate water-cement ratio, and the sprayed wet concrete should have no dry spots, no runny, strong adhesion and less rebound material. A shot of concrete thickness 50-70MM, and timely re-spray, double-spray interval time shall not exceed 2 hours, or use high pressure water to re-wash the spray surface. After the spraying of the spraying machine is over, the sprayed layer must be continuously sprinkled and maintained for more than 28 days. Each class should be sprinkled water within 7 days. Once the injection is completed, the elastics should be immediately collected and used in the process.