Different distances of sprayed concrete
The dry shotcrete machine has a spray concrete conveying distance of up to 200 meters, while the wet shotcrete machine the slurry with a viscosity that has been stirred, so the vertical conveying distance can only reach 20-30 meters, horizontal conveying The distance is 30-50 meters.
Operator and safety differences
The dry type 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 workers, and is not conducive to underground construction operations. Since the wet shotcrete machine has been mixed before, the slurry does not need to occupy a large amount of manpower, and does not generate dust, and thus has little influence on workers and the environment, and is suitable for various working environments.
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 is much lower than that of the dry sprayer, and since the slurry is previously stirred according to the water-cement ratio, the cohesiveness is very high, and it is not easy to deform with the change of the earth's crust. Has an important role.
