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Shotcrete machine is a kind of equipment that is widely used in tunnels, culverts, subways, water conservancy projects, and underground works shotcrete construction operations. Shotcrete machine can be used as well for small jobs, such as joint filling, swimming pool, refractory application and extensive slope consolidation work, etc. There are usually two types of shotcreting machines: dry spraying machines and wet spraying machines.
The dry mix shotcrete machine requires that the sprayed concrete, cement and other materials added into the hopper are dry. The air compressor exerts pressure to send the dry materials to the sprinkler head where there is an inlet pipe. Then the material is mixed with water at the shotcrete nozzle and then ejected.
Wet mix shotcrete machine is a kind of bolting and shotcrete supporting machine with good comprehensive performance such as reducing dust, reducing spring back, and saving materials. It uses compressed air or other power to transport a certain proportion of the mixing material through the pipeline and high-speed injection to the sprayed surface to form a concrete supporting layer.
Compared with dry shotcrete machine, wet shotcrete machine has low dust concentration, low rebound rate and accurate control of water-cement ratio. It can fully hydrate the cement and has high strength of sprayed concrete, greatly saving cost and is suitable for various working environments.