Concrete spraying machine is a construction equipment specially used for spraying concrete onto the tunnel wall. This equipment plays a key role in tunnel construction, especially in providing initial support and structural reinforcement.

　　Concrete spraying machine can be divided into two categories: dry spraying machine and wet spraying machine

　　- Dry spraying machine: Dry spraying machine transports dry mixture to the nozzle through a pipe, and then mixes it with water at the nozzle and sprays it onto the tunnel wall. Dry spraying machine equipment is relatively simple and suitable for small-scale spraying operations, but it is easy to generate a lot of dust during the spraying process, and the construction environment is relatively harsh.

　　- Wet spraying machine: Wet spraying machine transports wet concrete that has been mixed with water to the nozzle through pumping, and then sprays it onto the tunnel wall with the help of compressed air. The advantages of wet spraying machine are less dust, better construction environment, more uniform spraying effect, higher cohesion and density of concrete, so it has been widely used in modern tunnel construction.

　　Main features of concrete spraying machine

　　- Efficient construction: concrete spraying machine can spray concrete quickly and over a large area, which improves construction efficiency.

　　- Uniform spraying: The thickness of the sprayed concrete layer is uniform and can form a solid protective layer.

　　- Construction safety: Compared with traditional manual spraying, the use of spraying machine for construction can reduce the time that construction workers are exposed to dangerous environments and improve construction safety.

　　Applicable scenarios of concrete spraying machine

　　Concrete spraying machine is widely used in the initial support, secondary lining, reinforcement engineering and slope protection of tunnels, mines and underground projects. In tunnel construction, it is mainly used to provide initial support for the tunnel wall to prevent collapse and provide a stable working surface for subsequent support construction.

　　As an indispensable equipment in tunnel construction, concrete spraying machine greatly improves construction efficiency and safety, while ensuring the quality of concrete spraying.