| 摘要 |
PURPOSE: An assembly under drain is provided to conveniently construct and to reduce a transferring cost by grouting forming a floor unit in a field. CONSTITUTION: An under drain unit comprises an upper plate(30); a lower flange(21) extended along a horizontal direction in a lower portion; a sidewall member(10) contacting and supporting both ends of the upper plate; a back grouting unit installed between the lower flanges arranged to contact wit the lower flange; a middle sidewall member(20); and contact support units(17,27). The upper plate is installed on an upper end of the sidewall member and the middle sidewall member, and the other under drains are connected along a shaft line direction of the under drain unit. The contact support unit formed on the upper end of the sidewall and the middle sidewall members is engaged with a contact support unit formed along the upper plate. Thereby, the sidewall member endures outer force applied toward horizontal direction from outside.
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