Patent ID: 6103052
Filing Date: 2000-08-15
Classification: B29C,F16L,Y10T

Abstract:
A pipe lining method comprising the steps of:applying a fluid pressure to act on the inside of a pipe liner bag introduced in a pipe to press said pipe liner bag onto the inner wall of a pipe including a portion extending over a branch pipe opening of a branch pipe into said pipe;contacting a thickness reducing member extending from a periphery of a branch pipe opening into said pipe on the outer surface of said pipe liner bag to partially reduce the thickness of said pipe liner bag adjacent said thickness reducing member to form a thickeness reduced portion of said pipe liner bag at said periphery of said branch pipe;performing a predetermined pipe lining operation with said thickness reducing member being maintained in contact with the outer surface of said pipe liner bag; andapplying a force from said branch pipe to act on said portion of said pipe liner bag extending over said branch pipe opening to break said thickness reduced portion of said pipe liner bag.