| 摘要 |
PROBLEM TO BE SOLVED: To provide a hopper closing device for a ready-mixed concrete transport vehicle capable of being provided at a low cost because even a water injection device capable of simply closing the opening of a hopper if necessary and used for closing the opening of the hopper has an extremely simple structure capable of utilizing the washing water device usually mounted on a ready-mixed concrete vehicle. SOLUTION: The opening part of the hopper, of which the lower part extends into a rotary drum, of the ready-mixed concrete transport vehicle is closed in a watertight state by sealing water in a flexible waterproof bag body.
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