What matters should be paid attention to before the operation of the shotcrete machine
(1) Before spraying, the shotcrete machine should check the surrounding rock condition of the working area and the wear condition of the easily worn parts, and deal with the problems in time. Before spraying, open the wind and then the water, adjust the size of the wind and water, and then start the spraying machine for spraying. The spraying must use moist materials. When spraying concrete, the spraying hand and each type of work and each process are correctly coordinated.
(2) When the concrete shotcrete machine is shotcrete. The sprayer holds the nozzle with one hand, adjusts the water valve with the other hand, and connects the feeding. When starting spraying, a thin layer of concrete should be sprayed on all sprayed surfaces, and a spiral half-circle is made on this thin layer and a slow circle is made along the horizontal direction. For exercise, the diameter of the circle drawn should be 100-150mm.
(3) The spraying sequence of the concrete shotcrete machine is first wall, arch, bottom-up, spraying half of the roadway first, then turning the nozzle to spray the other half of the roadway, and finally closing the roof.
(4) The serious concave-convex phenomenon of the roadway should be concave first and then convex, and the serious concave should be separated.
