Our wet spray machines and wet spray robots all use wet spray technology to achieve good results. Tunnel concrete spraying is widely used in tunnel engineering with simple technology, timely support and lower cost. In the composite lining structure system of the tunnel, sprayed concrete can seal the rock surface on the one hand, and effectively prevent the collapse of the surrounding rock on the arch top after the stress is released, and the leakage of water and gas gas can be prevented, thereby ensuring the construction safety; on the other hand, the sprayed concrete Form a concrete supporting structure with the surrounding rock and actively make the surrounding rock of the tunnel become a part of the ring-shaped bearing structure, which can bear important loads during the design life cycle of the tunnel.
Sprayed concrete can be divided into dry spray and wet spray from the construction process. Therefore, its corresponding equipment is also divided into dry spray machines and wet spray robots. With the continuous improvement of wet spray equipment and technology and the continuous improvement of construction requirements, wet spray technology has become the mainstream of the development of spray technology in various countries around the world. Compared with dry spray technology, wet spray technology has the following four obvious advantages: First, it can greatly reduce the concentration of construction dust and eliminate the harm to workers' health. The second is high productivity. Dry concrete spraying machines generally do not exceed 5m 3 / h, while wet concrete spraying machines can reach 10 ～ 30m 3 / h. The third is low rebound. When dry sprayed, the concrete rebound can reach 15% ~ 50%. With wet spray technology, the rebound rate can be reduced to less than 10%. Fourth, the construction quality is high. In wet spraying, because the water-cement ratio is easy to control, the homogeneity of concrete can be greatly improved, and the quality of dry spraying depends to a large extent on the skill and responsibility of the operator.
