二重壁波形管を使ってシール井を作るには？
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HDPE二重壁波形管を使ってウォーターシール井戸を作るにはどうすればよいか、二重壁波形管には通常の三通はあるのか？
出口配管の管底が入口配管の管頂より高ければよく、必ずしも三通を使う必要はありません。
そんなことでは水封井の役割は果たせないでしょう？検査井ならそうするといいです
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