| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a spray device of an airless system, which can decrease a concrete projection diffusion angle compared with a conventional device, increase a sprayed concrete projection range, and reduce generation of dust. Ž<P>SOLUTION: The spray device is formed of an impeller body, a casing, a driving mechanism, a concrete force-feeding means, an accelerator feeding means, and a striking blade. A sprayed concrete receiving portion 165 of the striking blade 16 has a bottom surface 165C for receiving concrete charged from a concrete charging port 165A, and a striking surface 165D for projecting the concrete received by the bottom surface 165C via a concrete projection port 165B. The striking surface 165D has a width d along a direction in parallel with a rotation center shaft of the impeller body 11, and a distance p between the striking surface 165D and the concrete projection port 165B is set so as to be maximum at the center of the striking surface 165D in a width d direction and minimum at both edges of the same in the width d direction. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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