In modern tunnel construction, concrete wet spraying machine, as an efficient construction equipment, plays a vital role, especially in the initial support stage. Initial support is a basic and key work in tunnel construction. Its purpose is to quickly support the surrounding rock after tunnel excavation to prevent deformation and collapse of the surrounding rock and provide a safe and stable working environment for subsequent construction. The emergence of concrete wet spraying machine has greatly improved the construction efficiency and quality of initial support and has become a "weapon" in tunnel construction.
Working principle of concrete wet spraying machine
Concrete wet spraying machine is a construction equipment that fully mixes concrete materials with water before spraying. It uses a high-pressure pump to transport the pre-mixed concrete slurry to the nozzle, and then sprays the concrete onto the construction surface through the compressed air at the nozzle. Compared with traditional dry spraying or semi-wet spraying, this construction method has the advantages of uniform mixing, low rebound rate, less dust and high construction efficiency.
Application in initial support
In the initial support of tunnels, wet spraying concrete machines are mainly used to spray concrete to form an initial support layer. This layer of concrete can not only immediately support the surrounding rock and prevent deformation of the surrounding rock, but also form a good bond with the surrounding rock to enhance the stability of the surrounding rock. In addition, the high density and good waterproof performance of wet spraying concrete also enable the initial support layer to effectively prevent the infiltration of groundwater, providing a good foundation for the subsequent waterproof layer construction.
Advantages of wet spraying concrete machines
1. High efficiency: wet spraying concrete machines can achieve fast and continuous concrete spraying, greatly improving the construction speed of initial support and shortening the tunnel construction period.
2. High quality: wet spraying concrete has good workability and density, can form a uniform and dense support layer, and improve the support effect.
3. Environmental protection: The wet spraying process reduces dust and rebound during the construction process, reduces the impact on the health of construction workers, reduces material waste, and is more environmentally friendly.
The application of wet concrete spraying machine in the initial support construction of tunnels not only improves construction efficiency and quality, but also reflects the advanced and environmentally friendly nature of modern tunnel construction technology.