How to Use the wet mix shotcrete machine Chapter 3
Continuing from the previous article on how to use the wet mix shotcrete machine, this article will continue to give a further introduction to the use of the wet mix shotcrete machine.
8. Operation of the nozzle of the wet mix shotcrete machine: The appropriate distance between the nozzle and the sprayed surface is generally 0.8-1m. Wet spraying should be divided into sections, sections and blocks (the length of the sections should not exceed 6m during wet spraying, the sections are first down and then up, and the block size is 2m×2), and the nozzles of the wet mix shotcrete machine should be continuously Helical circular motion, the diameter of the helix is about 20-30m, the last circle presses one third of the previous circle, and the wet mix shotcrete machine spraying route should run from top to bottom in an "S" shape.
9. Thickness of wet spraying: the thickness of wet spraying concrete can reach more than 10cm at one time on the wall, and the thickness of one spray on the arch can reach 7cm. The main factors affecting the thickness of the sprayed layer are the slump of concrete, the effect of accelerator and air temperature. Generally, a thick spray layer can be obtained with a slump of about 8 cm, which can ensure that the concrete has a better setting effect within 2 minutes.
10. Layered wet spraying of wet mix shotcrete machine For fresh wet sprayed concrete, its tensile strength and bonding strength are very low. Once the self-weight of wet sprayed concrete is greater than its bonding strength with the sprayed surface, sagging and Therefore, the use of wet mix shotcrete machine requires layered wet spraying. The interval between the front and rear wet spraying is 2 to 4 hours. The thickness of one wet spraying is that the wet spraying concrete does not slip or fall.
The above is how to use the wet mix shotcrete machine.
