Patent ID: 7241076

Claim:
A method of repairing or reinforcing an underground pipe comprising: (a) pulling a flexible liner assembly with a flexible smooth bore liner and a semi-rigid helix through the pipe; (b) covering an interior of the pipe with the flexible liner assembly; (c) securing the flexible liner assembly within the pipe; (d) cleaning the pipe before the flexible liner assembly is pulled through the pipe; (e) pulling the flexible liner assembly through the pipe, wherein the pipe has at least one linear section and at least one curved section; (f) brushing the pipe with a brush assembly having a brush diameter up to 115 percent of an inside diameter of the pipe in order to provide a first cleaning of the pipe; (g) providing the brush assembly with a first brush end with a second brush end oppositely disposed therefrom; and (h) attaching at least one sphere to the first brush end and to the second brush end.