Patent ID: 6851454
Filing Date: 2005-02-08
Classification: F16L,Y10S

Abstract:
1. A drainage system comprising a trench of desired length and width and including a pair of side walls spaced from each other and a bottom extending between said side walls to define a corner with each of said side walls; a flexible generally cylindrical preassembled drainage member positioned in and extending longitudinally along at least one of said corners of said trench, said preassembled drainage member including an outer perforated sleeve member and a loose aggregation of discrete, crush resistant, lightweight elements enveloped and bounded within said perforated sleeve member; a generally cylindrical pipe at least twelve inches in diameter resting on the bottom of said trench and engaging against said preassembled member, said member generally conforming to the configuration of the corner area defined by the respective side wall and bottom of the trench and the adjacent wall of the pipe to support the wall of the pipe and thereby prevent deformation thereof under load.