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 andrnlateral sewer pipes. The process today consists of three (3) key steps:rn1. The main pipe is renewed by CIPPrn2. The service connection is robotically reinstatedrn3. The lateral pipes and the main/lateral connections are renewed and sealed by CIPPrnWhile the technology has proven robust, there are pipe configurations that cause CIPP to be considered anrnunsuitable method for pipe rehabilitation. One particular pipe configuration is where a service lateral splits into tworn(2) lateral pipes. Another pipe configuration is where two service connections are opposing, which is also known asrn“siamese laterals”. Until a recent development, the application of CIPP for these types of pipe configurations hasrnrequired multiple liners—one for each service lateral pipe—which resulted in multiple layers of CIPP, increasedrnreduction in the cross dimension of the pipe, and possible leakage at cold joints that formed at the overlappingrnsections. This paper will discuss the development and simultaneous application of a single-piece CIPP for the mainrnpipe and multiple branch pipes.