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A corrugated plastic drainage pipe in which drainage holes are formed through raised reinforcing formations on the corrugated pipe periphery and in which each of the reinforcing formations is integrally joined to adjacently disposed ridges or ribs of the corrugations and protrude from the valley the

A corrugated plastic drainage pipe in which drainage holes are formed through raised reinforcing formations on the corrugated pipe periphery and in which each of the reinforcing formations is integrally joined to adjacently disposed ridges or ribs of the corrugations and protrude from the valley therebetween to bridge the valley. Each reinforcing formation terminates in an end face which peripherally surrounds the drainage hole through the reinforcing formation and which is adapted to seat against surrounding soil or other material in a buried installation. Support feet formations are integrally formed with the corrugated pipe and are adapted to seat on a pipe-supporting surface to support the pipe.

대표청구항 ▼

A plastic drainage pipe comprising a corrugated section extending throughout a pre-selected length of the pipe and having an outer periphery formed with alternating, circumferentially extending ribs and valleys, the valleys lying between and interconnecting adjacently disposed ribs, at least a circu

A plastic drainage pipe comprising a corrugated section extending throughout a pre-selected length of the pipe and having an outer periphery formed with alternating, circumferentially extending ribs and valleys, the valleys lying between and interconnecting adjacently disposed ribs, at least a circumferentially extending portion of each rib in said section being annular, and a series of at least three raised, spaced apart formations formed integral with said section on the outer periphery thereof, said formations being arranged in at least one row extending longitudinally of said section, each of said formations extending between and being integrally joined to two of said ribs that lie immediately adjacent to each other to span the one of the valleys lying between the two adjacent ribs, each of said formations protruding outwardly from the valley that it spans at least approximately to the outer circumferences of said ribs, and each of said raised formations being formed with a drainage hole and an end face peripherially surrounding said drainage hole and having an axially extending dimension that is greater than the width of the valley spanned by the raised formation but less than the longitudinal spacing between the oppositely facing side walls of the two adjacent ribs on opposite sides of the valley that the raised formation spans, said dimension of the end face extending longitudinally of said corrugated section, each drainage hole being formed through said section along an axis that lies between adjacently disposed ones of said ribs without interrupting the annularity of at least a circumferentially extending portion of each of the adjacently disposed ones of said ribs to provide for the drainage of liquid from the pipe interior, the diameter of each of said drainage holes being larger than the width of the valley spanned by its associated raised formation, but not greater than the pitch of said ribs, there being at least one valley which lies between each pair of adjacently disposed ones of said formations in said row and which is imperforate at least in the region that extends longitudinally between the adjacently disposed ones of said raised formations.