PIPE FOR UNDERDRAINING

摘要

TITLE OF THE INVENTION Pipe for Underdraining A pipe for underdrainage comprises (1) a liquid collecting pipe; (2) a plurality of discontinuous protrusions on the outer surface of the liquid -collecting pipe; (3) a filter layer capable of passing substantially liquid only, not solid, the filter layer being disposed around the liquidcollecting pipe and contacting the top portions of the protrusions; and (4) a liquid-conducting way composed of a space communicating both in the longitudinal direction and in the peripheral direction as the liquid collecting pipe and defined by the protrusions, the outer surface of the liquidcollecting pipe and the inner surface of the filter layer.