Drain pipe with fluid collection section - is fitted with spaced hollow projections distributed around collection exterior and with foam sheet filter layer

摘要

Drainage pipe (1) comprises a fluid collection pipe (2), a number of spaced projections (3) on the outer surface of the pipe, a filter layer (4) which permits the passage of fluid but not solid matter. The filter layer (4) is located around the fluid collection pipe (2) and is in contact with the top parts of the projections (3) and a fluid guide conduit (5) formed by a space. he fluid collection pipe has small through apertures, and the projections are hollow, being distributed around the circumference of the collection pipe. The filter layer is a foam sheet with pore-like apertures.