| 摘要 |
Material, such as old unsound concrete material, is removed from a work surface by discharging water against such work surface at a pressure of from about 10,000 to about 25,000 psi from a rotating nozzle. During operation, the nozzle traverses the work surface along a series of linear paths and is incrementally moved in a longitudinal direction so as to pass over the work surface in a sequence of preferably overlapping transverse bands. An apparatus for carrying out the method of the invention comprises a support structure usefully in the form of a vehicle having an extendible arm driven by an extension means for incremental movement of that arm in a longitudinal direction. A rotatable nozzle is mounted on a nozzle support in turn secured to the extendible arm for bidirectional movement of the nozzle along a transverse linear path. Casters are also provided for maintaining the nozzle at a predetermined spacing from the work surface during operation of the apparatus.
|
