Author(s)

C. Chuk, G. Urgessa & H. Thippeswamy

Abstract

Underground pipes, such as water supply pipes and sewer pipes, are subjected to reduced strength and cracking due to aging. In order to combat strength reductions, excavation technologies have been used widely that allow replacing existing pipes with new pipes. However, these methods require road closures, traffic regulation and repaving. Various non-excavation (trenchless) repairs have been used in the last twenty years. This paper presents numerical analysis methods of stresses for pipes rehabilitated with cured-in-place-pipe (CIPP) linings. A CIPP lining is the common name given to the installation of a resin impregnated tube into a deteriorated pipe and curing it in place to produce a new structural pipe within a pipe. Examples of different liner types and their effect on reducing pipe wall stresses are presented. Keywords: CIPP, FRP, pipe rehabilitation, pipe lining, pipe stresses. 1 Introduction The need to rehabilitate, replace, and repair drinking water and wastewater systems in the United States is growing. The United States water infrastructure (water distribution lines, sewer lines, water treatment plants, and storage facilities) protects the environment as well as the public health. Most of the drinking and wastewater infrastructure was built 30 years after the end of World War II. It is very important for the country to prepare for the infrastructure rehabilitation and replacement over the next few decades. If these problems are ignored, the nation’s water and public health are put at risk. Selvakumar et al. [1]

Keywords

CIPP, FRP, pipe rehabilitation, pipe lining, pipe stresses