Foundation pit support concrete shotcrete machines are used for shotcrete construction in construction projects, mines, tunnels, culverts, subways, hydropower projects, underground projects, and coal mine tunnels. Concrete shotcrete machines are also used for spraying and forming refractory materials or repairing furnace linings in various industrial furnaces and kilns, and for soil transportation and spraying in various slope protection and landscaping projects.

The construction trowel sprayer, a tidal-type shotcrete machine, is suitable for railway (highway) tunnels, high-rise buildings, and water diversion culvert projects. Its simple structure makes it easy to operate and maintain. Its unique clamping device ensures a rational structure and user-friendly design, reliable performance, easy operation and maintenance, and a long service life.

Main Structure of Foundation Pit Support Shotcrete Machines:

The foundation pit support shotcrete machine anchor point mainly consists of a rotor-type concrete shotcrete machine, a cement slurry mixer, an extrusion-type cement slurry pump, an electrical control box, a discharge elbow, a gas system, a mixing device, a spray gun, and a machine frame. A foundation pit support shotcrete machine primarily consists of a hopper, a mixing device, a discharge elbow, an air system, a rotor, and a reducer. The motor drives the rotor through the reducer. The machine feeds the mixed material into the rotor, which is then conveyed out of the discharge elbow via the air pipe in the air system. Auxiliary air inlet pipes in the air system then direct the mixed material through the feed pipe, nozzle, and onto the surface being sprayed.

Key points of concrete spraying with a foundation pit support shotcrete machine:
a. Before spraying, clean the rock surface with high-pressure air or water to remove dust and concrete debris adhering to the rock surface and ensure a strong bond between the concrete and the rock surface. If high-pressure water cleaning causes the rock surface to soften, high-pressure air should be used to remove debris (depending on the geological conditions). b. Strictly adhere to the prescribed accelerator dosage and ensure uniform application.
c. The operating air pressure of the spray gun should generally be controlled between 0.2 and 0.4 MPa.
d. The sprayer should strictly control the water-cement ratio to ensure a smooth and even spray layer, free of dry spots or slippage.
e. The nozzle should be perpendicular to the rock surface being sprayed, maintaining a distance of 0.6 to 1.0 meters between the nozzle and the rock surface.