IMPROVED MEANS AND METHOD FOR LINING UNDERGROUND PIPES USING A SPIRALLY WOUND PLASTIC STRIP

摘要

The invention provides an improved means and method for lining underground pipes utilising an oval shaped winding head or cage (11) comprised of an annulus of spacially located roller (16) located at the base of a manhole (12) which provides access to the pipe to be lined, wherein the annulus has an inner circumference which approximately equals the inner circumference of the pipe to be lined. A resilient plastic strip (15) is fed into the winding head (11) so as to form a helically wound liner tube (14) which exits from the winding head having a non-circular shape. The wound liner tube is advanced towards the open leading end of the pipe and is allowed to transform to a generally circular shape prior to its entry into the pipe, with the diameter of the circular pipe being apploximately equal to the inner diameter of the pipe to be lined.