Abstract: A mobile shortcrete spraying apparatus has a spraying device which comprises a support arm able to move horizontally and vertically, a spray lance likewise movable, supported thereon, and at the end of the lance and rotatable with respect to the longitudinal axis of the lance a spray nozzle and a measuring probe. The measuring probe determines distance of the probe from a multiplicity of measuring points on a substrate to be sprayed, according to a predetermined grid pattern, and a control unit causes the spray nozzle to spray perpendicularly with respect to a plane defined by three such measuring points or a line defined by two measuring points.