Development of a Waterproof Sheet Joint Inspection Method for Penetrations of Waterproof Sheets in Drainage Pipes for Leachate Collection at Final Disposal Sites

Abstract

In many controlled landfills, leachate collection pipes penetrate the impermeable barrier at the toe of the reservoir dam in the downstream section of the landfill. Inspection of the joints between leachate collection pipes and water-impermeable sheets is crucial to prevent leachate leakage, as poor joint quality can lead to increased leakage risks. Heat fusion of polyethylene water-impermeable sheets, which are the same material as the leachate collection pipes, is possible, but self-propelled heat fusion machines are not suitable for complex joint geometries. Indoor integrated molding is increasingly being adopted to improve workability, but there was no high-precision inspection method for joints between leachate collection pipes and water-impermeable sheets. This paper reports the development and evaluation of a high-precision inspection method for joints between leachate collection pipes and water-impermeable sheets for indoor integrated molding.