| 摘要 |
PROBLEM TO BE SOLVED: To control dispersion of dust caused by rebound of concrete. SOLUTION: The dust dispersion control device 7 is composed of a hollow ring 8 fixed to the periphery at the front end of a concrete spraying nozzle 1, a plurality of fluid nozzles 9 each having a number of jetting ports at the front end and arranged radially at the periphery of the hollow ring 8, a high- pressure pump 11 connected to the hollow ring 8 through a high-pressure hose 10, and a water tank 12.
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