Patent ID: 8191972

Claim:
An apparatus for removing concrete from a wall, said apparatus comprising: a) a frame assembly having a bottom region and a front region, said front region positioned adjacent the wall; b) a carriage assembly coupled to said frame assembly proximate said front region and adjacent the wall, said carriage assembly extending from a first side of said frame assembly to a second side of said frame assembly; c) at least one nozzle assembly comprising: (i) at least one nozzle operative to emit a jet of water against the wall with sufficient velocity to remove concrete from the wall; (ii) a nozzle block rotatable about a first axis, the first axis being parallel to the plane of said front region and perpendicular to said carriage assembly, wherein said nozzle is mounted on said nozzle block; (iii)a first nozzle actuator operative to position said nozzle a selected distance from the wall; and (iv)a second nozzle actuator operative to rotate said nozzle block about the first axis, whereby the rotation of said nozzle block causes said nozzle to direct the jet of water toward a side of an opening in the wall; d) a nozzle assembly driving means for driving said nozzle assembly back and forth along said carriage assembly; e) a transporting assembly operative to raise and lower said carriage assembly along said front region of said frame assembly; and f) a platform or deck, wherein said bottom region is supported on said platform or deck.