Device for projecting a wall coating, particularly for an excavation

A device for simultaneously projecting a liquid or pasty product and a pulverulent or granulous or fibrous filler to make a reinforced plastic wall coating, comprising a casing, a shaft arranged to rotate freely in said casing, said shaft extending through said casing and having one end outside said casing drivingly connected to a motor means, an opposite end extending from the other side of said casing, a centrifugal projecting means mounted on said opposite end for rotation therewith, a spray device mounted between said casing and said opposite end substantially transversely of said shaft for rotation therewith for projecting the product under pressure, said shaft having a central channel in communication with said spray device, said centrifugal projecting means comprising an obtuse cone having an apex directed opposite said spray device, a pipe with a first end opened towards said obtuse cone and a second end in communication with a means for supplying the filler.