Patent Number: 8,585,323

Title: Method for repairing a damaged sewage pipeline without digging a trench

Abstract: The present invention relates to a method for repairing a damaged sewage pipeline. In the method, leakage on the upper and lower portions of the sewage pipeline, a manhole and a household branch pipe within a repairing section is checked. Then, partial trenchless repairing for the damaged portion of the pipeline is performed and a primary repairing liquid is filled into the pipeline at high pressure. Next, the primary repairing liquid remaining in the pipeline is sucked and a secondary repairing liquid is injected into the interior of the pipeline. Then, the secondary repairing liquid remaining in the pipeline is sucked. Subsequently, intermediate cleaning is performed and the repairing liquids accumulated on the bottom portion of the pipeline is removed.

Inventors: Lee; Dong-Ryul (Kyungjoo-si, KR)

Assignee: Han; Myung Ja

International Classification: F16L 55/18 (20060101)

Expiration Date: 1/19/12018