What is the essential difference between a dry shotcrete machine and a wet shotcrete machine? The following is a detailed analysis of the five essential differences between the dry shotcrete machine and the wet shotcrete machine. I hope that it will help you to purchase the shotcrete machine.
1, The slurry has different degrees of wet and dry
The spray slurry added to the dry shotcrete machine is dry, such as concrete, cement, etc., without adding water or adding a small amount of water. The wet shotcrete machine adds a well-mixed mixture, such as concrete, cement and water, and then sprays it out.
2, The spray mode is different
Since the dry shotcrete machine is made of dry concrete or cement, the spray head needs to be filled with water to ensure the spray effect and not generate too much dust. The wet shotcrete machine uses water to fully mix the concrete or cement, and then sprays it, and no water is needed at the nozzle, and no dust is generated, which ensures the working environment.
3. Different conveying distance and wind pressure
The dry shotcrete machine can transport a distance of more than 200 meters, while the slurry sprayed by the wet shotcrete machine is a slurry that has been stirred and viscous, so the vertical conveying distance can only reach 20-30 meters, and the horizontal conveying distance is 30. -50 meters. The dry shotcrete machine can be sprayed with a wind pressure of 7 cubic meters, and the wind pressure of the wet shotcrete machine requires 13 cubic meters.
4. Operators and safety are different
The dry shotcrete machine needs to occupy a large number of operators. Due to the large amount of dust generated, it not only affects the environment, but also causes serious damage to the safety production and the workers, and is not conducive to underground construction operations. Since the wet shotcrete machine has been mixed before, the slurry is not required to occupy a large amount of manpower, and it does not generate dust, and thus has little influence on workers and the environment, and is suitable for various working environments.
5. Difference in rebound rate and cohesiveness
The dry shotcrete machine has a rebound rate of 15-50%, and it also causes poor cohesiveness, especially in underground construction, which will be deformed by the change of the earth's crust, causing splitting and destruction. The rebound rate of the wet shotcrete machine reaches 10%, and since the slurry is previously stirred according to the water-cement ratio, the cohesiveness is high and it is not easy to deform with the change of the earth's crust, which plays an important role in safe production.
