Abstract: Apparatus for the hydrodemolition of concrete layer including a movable vehicle, a bed having a guideway extending transversely to a direction of movement of the vehicle, a nozzle assembly having a guide slidably engaging the guideway and a plurality of nozzles spaced apart in a direction transverse to the guideway, separate fluid flow controllers coupled between a pressurized source of fluid and respective nozzles, the nozzles being oriented to spray a fluid jet onto the concrete surface and on actuator for moving the nozzle assembly back and forth along the guideway.

Abstract: This application discloses an automated apparatus for cleaning the interior surface of a pipe. The device includes a vehicle which propels itself down the inside of the pipe. A cleaning system is fixed to the vehicle and uses arms to reach the walls of the pipe. At the end of each arm sits a spray nozzle assembly equipped with spray nozzles. The spray nozzle assembly rotates or oscillates to spray clean the pipe surface. The arms and spray nozzle assembly interchange with other such cleaning systems depending on the shape or type of pipe and the desired cleaning technique. The apparatus is tethered to a source of fluid under pressure and a power source both of which are located off-board the apparatus at a remote location. An operator supervises the device's operation, controlling the speed and direction of travel of the vehicle, the speed and direction of oscillation and rotation of the cleaning system, and the fluid pressure delivered by the spray nozzles.