Underdrainage pipe
    1.
    发明授权
    Underdrainage pipe 失效
    排水管

    公开(公告)号:US4182580A

    公开(公告)日:1980-01-08

    申请号:US887746

    申请日:1978-03-17

    CPC分类号: E02B11/005

    摘要: An underdrainage pipe comprises a liquid-collecting pipe, protrusions on the liquid-collecting pipe, a filter layer around the liquid-collecting pipe and a liquid-conducting way, and the protrusions having at least one recess for each and the bottom portion of the recess not reaching the surface of the liquid-collecting pipe.

    摘要翻译: 排液管包括液体收集管,集液管上的突起,集液管周围的过滤层和导液方式,并且突起具有用于每个和底部的至少一个凹部 凹部未到达集液管的表面。