Bodenflächenstrahlgerät

This invention relates to a floor surface blasting apparatus used for removing rustproof coating (blasting ) on a tank bottom surface to inspect weld lines (12) on the bottom surface of high-capacity fuel tank (8). The floor surface blasting apparatus comprises a work arm (15) which has weld line detecting sensors (17a,17b,17c) for detecting a weld line (12) at the tip end and also has a blast head (16) incorporating a suction nozzle; a work carriage (1) which has the work arm (15) and magnet devices (14) incorporating a magnetic substance and travels arbitrarily on the floor surface; a transfer carriage (2) which has a blast device (18) for supplying blasting material to the blast head (16) and travels arbitrarily on the floor surface; and a control means which controls the blast head (16) so that the blast head (16) is positioned on a weld line (12) in accordance with the detection signal from the weld line detecting sensors (17a,17b,17c) and the signal of a position detecting device (7) for detecting the position of the blast head and also makes the transfer carriage (2) follow the work carriage (1).