Abstract: A method of repairing or reinforcing underground pipes includes the steps of providing a flexible liner assembly having a first end and a second end, applying an internal pressure to the flexible liner assembly, inserting the first end of the liner assembly into a first end of a pipe section while maintaining the internal pressure, pushing the flexible liner assembly through the pipe section while maintaining the internal pressure, releasing the internal pressure from the flexible liner assembly, and connecting the first and second ends of the flexible liner assembly to the pipe section so that the flexible liner assembly provides a substantially leak-free conduit through the pipe section. The method addresses drawbacks associated with prior art methods by preventing or reducing contact between the flexible liner assembly and sharp inner corners of the pipe section, thereby reducing drag between the flexible liner assembly and the interior of the pipe section.

Abstract: A method for reinforcing or repairing a pipe pulls a liner assembly with a flexible smooth bore liner and a semi-rigid helix that gives non-collapsible characteristics within the damaged pipe for both linear pipe sections and curved pipe sections. The existing pipe is first cleaned with a specially designed brush with two wooden spheres at each end of the brush to prevent snagging or jamming during brush operations. The liner assembly is then pulled through the total length of the pipe and anchored at each end with retaining sleeves, which are sandwiched and glued within the liner assembly and the inside diameter of the existing pipe.

Abstract: A method for reinforcing or repairing a pipe pulls a liner assembly with a flexible smooth bore liner and a semi-rigid helix that gives non-collapsible characteristics within the damaged pipe for both linear pipe sections and curved pipe sections. The existing pipe is first cleaned with a specially designed brush with two wooden spheres at each end of the brush to prevent snagging or jamming during brush operations. The liner assembly is then pulled through the total length of the pipe and anchored at each end with retaining sleeves, which are sandwiched and glued within the liner assembly and the inside diameter of the existing pipe.