A Technique for Renewing a Section of Mainline Pipe while Simultaneously Renewing Multiple Service Lateral Pipes through the Use of Continuous CIPP

摘要

Cured-in-Place-Pipe (CIPP) has proven to be a successful, long-term technology for rehabilitating mainline and lateral sewer pipes. The process today consists of three (3) key steps: 1. The main pipe is renewed by CIPP 2. The service connection is robotically reinstated 3. The lateral pipes and the main/lateral connections are renewed and sealed by CIPP While the technology has proven robust, there are pipe configurations that cause CIPP to be considered an unsuitable method for pipe rehabilitation. One particular pipe configuration is where a service lateral splits into two (2) lateral pipes. Another pipe configuration is where two service connections are opposing, which is also known as “siamese laterals”. Until a recent development, the application of CIPP for these types of pipe configurations has required multiple liners—one for each service lateral pipe—which resulted in multiple layers of CIPP, increased reduction in the cross dimension of the pipe, and possible leakage at cold joints that formed at the overlapping sections. This paper will discuss the development and simultaneous application of a single-piece CIPP for the main pipe and multiple branch pipes.