Modified pipe inlet

摘要

A pipe, such as a liner for repairing a failing culvert, comprises a continuous wall defining an inner wall surface and an exterior wall surface. The pipe further defines a central fluid passageway extending from an inlet end to an outlet end. The inner wall surface of the pipe defines a waveform-like geometry near the inlet end, said waveform-like geometry including an initial curvature beginning at the inlet end of the pipe and continuing until reaching a predetermined location where an inner diameter of the pipe is minimized, the curvature then continuing with the inner diameter increasing again to a second predetermined location, before the inner diameter again decreases to a third predetermined location and then remains substantially constant along the remaining length of the pipe, thus creating an annular recess in the inner wall surface of the pipe.

主权项

1. A liner system for repairing a failing culvert, comprising:
a liner; an attachment mated to an inlet of the liner, said attachment defining a central fluid passageway extending from an inlet end to an outlet end, and said attachment having an inner wall surface that defines a sinusoidal waveform geometry near the inlet end and around a circumference of the inner wall surface for directing fluid into the liner, the sinusoidal waveform geometry consisting of a curvature beginning at the inlet end of the attachment where an inner diameter of the attachment is maximized and continuing until reaching a first predetermined location where the inner diameter of the attachment is minimized, the curvature then continuing with the inner diameter immediately increasing again to a second predetermined location, before the inner diameter again decreases to a third predetermined location, thus creating a single annular recess in the inner wall surface of the attachment, which, in cross-section, forms a continuous arc in the inner wall surface of the attachment extending from the first predetermined location to the second predetermined location to the third predetermined location.