The tunnel wet shotcrete machine is one of the most effective tools for reducing dust, minimizing rebound, and saving materials in both domestic and international applications for tunnel construction. Wet shotcrete machines are widely used in engineering projects. They utilize compressed air or other power sources to mix materials in a specific ratio, then transport and spray them at high speed onto the surface, where they solidify and harden, forming a concrete support layer. The shotcrete technique is simple, cost-effective, versatile, produces low dust emissions, minimizes rebound, protects the working environment, conserves materials, and improves the quality of the sprayed layer, making it an essential tool in various construction fields.
The wet shotcrete machine can increase efficiency by 2-3 times during operation, accelerating project timelines while indirectly reducing construction costs. The shotcrete structure is dense, with low rebound and good quality, requiring only a few workers to complete the job, thus reducing labor and material costs and effectively minimizing accident risks. The machine supports wireless remote control, reduces dust pollution, and lowers the risk of occupational diseases. It is primarily used for tunnel spraying and is mature, reliable, and has a low mechanical failure rate, making maintenance easy. The machine also features GPS remote control, positioning, and fault diagnosis functions, which reduce downtime due to failures.
The advantages include a special vibrating hopper that ensures smooth transfer of wet-mixed concrete into the rotor chamber; a new metering pump that accurately and uniformly adds liquid accelerator; and a patented discharge elbow that ensures uniform, continuous, and stable material flow with minimal pulsation, eliminating blockages of wet concrete and reducing system air pressure. These features significantly reduce dust concentration near the machine and nozzle, eliminating health hazards to workers. The machine boasts high productivity.
When operating, the rebound rate of the wet shotcrete machine is significantly lower than that of dry spraying. For dry spraying, the rebound rate can reach 15%-50%, while with wet spraying, the rebound rate can be reduced to below 10%. The pump system has high output pressure and is equipped with large-diameter injection hoses, providing strong blockage resistance. This makes the wet shotcrete machine highly cost-effective and durable, greatly simplifying construction.
Particularly, the working time has a significant impact on the total construction period of the tunnel. With large wet spraying mechanical arms, the machine can spray up to 30 cubic meters of concrete per hour. Improving work efficiency will notably shorten the tunnel construction time and reduce costs. In more complex tunnel geology, safety management becomes even more critical. The tunnel wet shotcrete mechanical arm uses wireless remote control from a safe distance, ensuring strong safety during construction, a better working environment, and high automation.
