Importance

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Abstract

A corrugated pipe is provided having a pipe structure of an inner wall having an interior surface and an exterior surface, and an outer wall having corrugations, each of the corrugations having an interior surface and an exterior surface, each corrugation having a crown. The pipe structure has a trough between each corrugation, and each trough has a center-point, with the distance between the center-points of adjacent troughs defining the pitch of the pipe. The pipe structure has at each crown a first distance extending in a straight line from the crown exterior surface to the interior surface of the inner wall, with the distance defining the pitch being a second distance, with the ratio of the first distance to the second distance being less than 0.8:1.0. The pipe could be of metal or plastic, but if plastic, upon the application of pressure the pipe can deflect to greater than 30% of its original diameter without exhibiting imperfections of structural failure, and in the preferred embodiment greater than 35%. The outer wall has a sidewall portion intermediate the crown and the trough, with the sidewall portion being inclined to the inner wall in the range of 75-80%, with the angle of inclination in the preferred embodiment being about 781/2%.

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First Claim