| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a concrete spraying apparatus which is not affected by concrete rebounding from a wall surface of a tunnel, and which can spray the concrete from a proper spraying distance. Ž<P>SOLUTION: This concrete spraying apparatus 10 includes: a manipulator 14, the leading end of which is fitted with a nozzle 20 for emitting a jet of concrete; a box-shaped protective case 30 which is attached to the leading end of the manipulator 14, and which makes an area at least in the spraying direction of the nozzle 20 transparent; a laser range finder 31 which is housed in the protective case 30 so as to apply laser beams in the spraying direction of the nozzle 20; a determination means which computes a distance from a leading end of the nozzle 20 to a concrete wall surface on the basis of the result of measurement performed by the laser range finder 31, and which determines whether or not the computed distance falls within a predetermined range; and an alarm means for giving an alarm when the distance computed by the determination means is judged to fall out of the predetermined range. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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