| 摘要 |
PURPOSE: An apparatus for purifying drainage from bridge is provided to prevent river water pollution by bridge overflow. CONSTITUTION: The apparatus includes a concrete box(301) which is installed at a portion adjacent to lower end of bridge pier to purify drainage from bridge drainage pipe; a plural gravel beds(302,303,304,305) which are installed inside the concrete box for multi filtration of drainage; lattice members(306,307) which are installed on the uppermost part of the plural gravel beds to filter out impurities contained in overflow from the concrete box.
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