Patent ID: 7267739
Filing Date: 2007-09-11
Classification: E03F,F16L

Abstract:
1. A method for in situ minimization of infiltration and ex-filtration of underground pipes comprising the following steps: (a) forming an elastically coilable and radially expandable support having a diameter when in a relaxed state; (b) coiling the expandable support to a reduced diameter under tension; (c) inserting the expandable support into an interior annulus of a pipe where a first inner surface of the pipe wall has a diameter smaller than the outer diameter of the expandable support in a relaxed state; (d) releasing the tension of the expandable support when at a selected location; (e) expanding the outer diameter of the expandable support to contact the inner surface of the pipe wall forming the interior pipe diameter; and (f) injecting from the ground at least one chemical reactant into the ground to form a reaction product.