better detail, thank you.
The thickness depends on the thickness of the design in your calculation. The shotcrete is usually a large air compressor and special injector.
The thickness and the machine have little relation, the design thickly can spray several times more (the frequency of The Times more can guarantee the strength). Every time the spray is not more than 50, the total thickness is not greater than 200. The equipment has air compressor, geomantic separator, mixer, spray machine and so on. The quality is not guaranteed by the quality of the operation.
The thickness of the spray layer is usually 50 ~ 150 mm, the thickest no more than 200mm. In order to get uniform concrete spray layer, the minimum thickness of not less than two times of gravel size, spray layer too thin, easy to make the spray layer produces through crack and local peeling off, so you should not less than the minimum thickness of 50 mm. The thickening of the spray layer, the greater the force majeure, the greater the stiffness, and the load is also large. When the stiffness of the spray layer can not be adjusted to the deformation of the surrounding rock, the thicker the force, the worse it is. Too much thickness is economically irrational. At home and abroad, it is proved that the maximum thickness of shotcrete is not more than 200mm.
