For the tunnel shotcrete construction, it usually will use the wet spraying machine. According to the working environment, it can be divided into dry shotcrete machine and wet shotcrete. The dry concrete spraying machine is the main equipment, but the construction environment will caused to great harm to human body. Based on the increasing in wet technology, it is currently used mostly tunnel wet-spray machine construction. Next, we will introduce the advantages of the tunnel wet spray machine and usage instruction.
Advantages of tunnel wet spraying machine
- The slurry used by the tunnel wet spraying machine is premixed, which does not require a lot of labor during actual construction, and the amount of dust is small, which has little impact on relevant personnel and the environment, and so it is suitable for various working environments.
- The spring back rate of tunnel wet spraying machine is no more than 10%, and it has strong cohesiveness and also is not easy to deform. It plays an important role in safety production.
- Shotcreting after premixing can effectively ensure the concrete mix ratio and concrete construction quality.
- The wet printer can effectively save raw materials, the material of spraying machine are uniform, and the quality of spraying layer is good.
- The commissioning of wet spraying machine does not require too much time for concrete preparation, and the operation and maintenance are much more convenient.
Advantages and precautions of tunnel Wet spraying machine
Precautions of wet spraying machine in mixed tunnel
- During concrete spraying operation, long metal blocks such as bolts and nuts must be strictly prevented from entering the material room to damage the material room.
- When spraying concrete, if the wind pressure is higher, the rebound amount is larger, and the dust will be much more, and then the cement consumption will be larger. If the wind pressure is too small and the spraying speed is low, and then the concrete is not easy to compact.
- The electric control system of tunnel wet spraying machine has uniformly adjusted the rotation direction of each driving motor during installation. The phase adjustment must start from the input power supply, and the phase sequence of the main motor power supply shall not be adjusted separately.
- Before starting the tunnel wet spray machine, check whether the grounding terminal of the case is reliably grounded or not.
- When the wet machine is working, the nozzle moves continuously in a circle, forming a spiral motion. After a circle, it will move one third of the previous circle.
- The spraying route of the tunnel wet spraying machine must move from top to bottom in the form of “s”. The concrete in the tunnel shall be sprayed from the arch to the wall.
- The working face temperature of tunnel wet spraying machine should be above 15℃.
In the process of shotcrete construction, wet shotcrete spraying technology has the advantages of less dust, low rebound rate and low consumption cost. By fully and accurately adjusting the mixture ratio, the strength and support force of concrete, the bond force between concrete and tunnel foundation and the anti-seepage of concrete can be guaranteed. In addition, wet spraying technology has a wide range of applications, not only for highway, railway and subway tunnels with large sections, but also for other types of tunnel construction, wet spraying machine can be used as initial support.
As the main equipment for shotcrete and anchor protection in the construction of mine tunnels, railway and highway tunnels, water conservancy culverts, underground projects, high-rise building foundation pits, military projects, etc., the tunnel wet shotcrete machine is widely used. Tunnel wet spraying machines mainly include small wet spraying machines, hydraulic wet spraying machines, rotary wet spraying machines, vehicle mounted wet spraying machines, tunnel wet spraying robots, etc., with small working dust and little rebound.
This is our Advantages and precautions of tunnel Wet spraying machine, if you are interested in our products, please contact us.
