| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an overlaying sand method capable of preventing turbidity from occurring because microscopic particles 6 included in an overlaying sand material are diffused in water, and capable of preventing a bottom mud layer 2 from being formed on an overlaying sand material layer 11 because the overlaying sand material disturbs the bottom mud layer 2 to make bottom mud rise and precipitate, during execution of overlaying sand work.SOLUTION: An overlaying sand method of the present invention is characterized in that an overlaying sand material plate 8 formed by hardening zeolite particles by a biodegradable binding material is sunk to the bottom of water.</p> |
