The concrete shotcrete machine is the main equipment for shotcrete anchor support operation. It uses compressed air to mix the concrete materials with a certain gradation and water cement ratio through the delivery pipe through the nozzle of the shotcrete machine and spray them out at a high speed, thus forming a concrete support layer on the surface to be sprayed. Concrete shotcrete machine is widely used in the shotcrete support engineering related to construction, municipal, railway and highway tunnels, foundation pits, mines, slopes, etc.
Concrete shotcrete machine is divided into concrete dry shotcrete machine and concrete wet shotcrete machine. The concrete dry spraying machine adopts the dry spraying process. During the shotcrete operation, the dust pollution and rebound are relatively serious, the air quality is poor, the water consumption control is inaccurate, the concrete strength is difficult to guarantee, and the use is limited.
The wet shotcreting process is adopted for the wet shotcreting machine, which largely solves many problems existing in the dry shotcreting machine, especially small rebound rate and low dust concentration, eliminating the harm to workers' health and saving the cost of shotcreting. In addition, the coordination of materials is easy to control, and the working efficiency is higher than that of dry spraying, which is suitable for various working environments.
The wet shotcrete construction technology of the concrete wet shotcrete machine is a construction method in which the finished concrete is produced in the cement concrete mixing plant according to the mix proportion. After the concrete is transported to the working face, the concrete wet shotcrete machine is used to press the concrete to the nozzle, and the accelerator is added at the nozzle to spray it out at high speed. During the high-speed spraying process, the concrete and accelerator are fully combined, and the concrete support layer is formed by impact on the surrounding rock.
Concrete wet shotcrete machine is the core equipment in wet shotcrete construction. Common wet shotcrete machines include small wet shotcrete machine, hydraulic wet shotcrete machine, rotary wet shotcrete machine, vehicle mounted wet shotcrete machine and wet shotcrete manipulator. With the enhancement of people's environmental awareness and the improvement of the requirements for the quality of shotcrete, more and more projects require the use of wet shotcrete. With the continuous progress of production technology of wet shotcrete machinery and related materials and equipment, wet shotcrete will be widely used as a mature construction technology.
