Evaluation of Cured-in-place Pipe Lining Installations PDF
By:Susen Das
Published on 2016 by
Renewal of damaged and worn pipes is becoming a significant maintenance concern for municipalities in North America as many collection systems (water and wastewater underground infrastructure) have reached beyond the ends of their service lives. Cured-in-place pipe (CIPP) rehabilitation is one of the most common trenchless technologies, allowing users to renew existing underground pipes without using open cut methods. However, relining of large diameter sewer mains is not a straightforward process, and it is associated with a number of obstacles and deficiencies that lead to significant cost impacts to trenchless industries. This research provides a systematic review on the issues and challenges associated with CIPP rehabilitation projects of sewer mains, water mains and service laterals. Common problems and challenges are first reviewed from available literature and CIPP installation site visits. These obstacles and risks are classified into five different categories: pipe condition and configuration, pre-installation, challenges during installation, post-installation, and environmental challenges. In addition, this study discusses relevant measures adopted in current practices to mitigate these challenges. Although productivity is the most significant factor for the planning and budget allocation of CIPP projects, there is limited information on the topic in literature. This study describes the CIPP process and conducts a productivity analysis of more than 40 sewer mainlines in Edmonton, Alberta, rehabilitated through the CIPP inversion process. The collected data includes inspection surveys of liner installation processes in sewer mains of varying lengths, diameters, and pipe materials. This research illustrates how varying pipe diameter and liner thickness affects productivity of the CIPP lining process. It is anticipated that this study's results will contribute to more accurate estimations of CIPP project productivity, thereby helping with effective CIPP rehabilitation project planning and management. Furthermore, for a lateral CIPP rehabilitation process, selection of an appropriate construction set-up for a project, such as crew and equipment conformation, is one of the challenges of the construction planning stage. It is essential to choose a suitable method that can save costs, time, and avoid significant disruption in the area, especially for projects in urban settings. Management must consider possible resource combinations (crew and equipment), test various construction scenarios, calculate the associated cost and time for each scenario, and determine the most desirable solution. In this research, a simulation-based approach was used to assist decision makers in choosing the best crew and equipment combination for lateral rehabilitation using CIPP from the mainline, also denoted by ASTM F2561 as lateral relining process using main and lateral cured-in-place liner (MLCIPL). A discrete event simulation model was developed for the lateral CIPP rehabilitation process. The simulation model enables users to apply different resource combinations and calculate the total duration of the project. The comparison of results is demonstrated in this thesis. This research also suggests an amendment to the installation sequence to improve the construction productivity, which was developed from the results of this model.
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