PROBLEM TO BE SOLVED: To provide an air cleaning construction method for actualizing smooth continuation of working processes while keeping working environment good for workers.;SOLUTION: A water spray generating device 1 is installed on a movable vehicle. A jet pipe 3 is provided on the water spray generating device for jetting 500-1,200 mL/min water spray consisting of water particles having particle sizes of 10 μm or smaller, toward a working plane or a ceiling surface as a site adjacent thereto, and outside air is discharged at the same time from a large-diameter air duct 4 at speeds of 10-25 m/s in the same direction. The ultrafine water particles adsorb a great amount of fine floating dust having almost the same particle size or smaller, floating in a tunnel. The ultrafine water particles adsorbing the floating dust drop on the floor surface and the working face. The dropping dust adsorbed and wetted by the ultrafine water particles somewhat wets the floor surface and the working face. The dust free from re-flotation wets small-large particle size dust dropping thereafter to prevent the re-flotation thereof.;COPYRIGHT: (C)2009,JPO&INPIT
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