| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage structure which is easily constructed and exhibits high neutralization effect. SOLUTION: In muck banking 1 using pyrite-containing excavation muck, producing acidic water when containing water, as a banking material, a down pipe 5 is installed which is formed with a water passage hole 7 on the side thereof and vertically penetrates the banking 1 so as to discharge permeated rainwater. A neutralizing material 8 is provided around the down pipe 5 together with stone and the like 14. The acidic water produced through the contact of rainwater with pyrite is neutralized with the neutralizing material 8 and then introduced into the down pipe 5. COPYRIGHT: (C)2011,JPO&INPIT
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