Apparatus for pneumatically discharging a hardening building material, in particular, a hydraulic air-placed concrete or mortar

Abstract From the Canadian patent

For an apparatus for pneumatically discharging a hardening building material, in particular a hydraulic air-placed concrete or mortar, conveyed hydromechanically in a dense stream which has at the end of a conveyer pipe or hose that feeds the building material preferably delivered by a pump a mouth, piece whose conveyer pipe has a discharging end preferably designed as a nozzle, an end located opposite and bearing the opening of a compressed air supply pipe and a pipe opening, out between the two ends which introduces the dense stream into the stream of compressed air, activator being added to the building material through at least one supply pipe to activate its hardening, and the …