- Author
- Zhao, J. Q. | Doherty, I. J.
- Title
- Behavior and Performance of Linear Pipe in Trenchless and Trenched Portions of Slipling Rehavilitation.
- Coporate
- National Research Council of Canada, Ottawa, Ontario
- Report
- NRCC-46292
- Distribution
- FOR MORE INFORMATION CONTACT: National Research Council of Canada, Institute for Research in Construction, Ottawa, Ontario, K1A 0R6, Telephone (613) 993-2607, Fax: (613) 952-7673, Email: [email protected] Website: http://irc.nrc-cnrc.gc.ca/fulltext/nrcc46292/ [FULL DOCUMENT IN PDF]: http://irc.nrc-cnrc.gc.ca/fulltext/nrcc46292/
- Book or Conf
- International No-Dig 2003 Conference. Proceedings. March 31-April 2, 2003, Las Vegas, NV, 1-14 p., 2003
- Keywords
- pipes | deformation
- Identifiers
- sliplining; linear pipe; trenchless; trenched protion; differences in external loading; pipe deflection along longitudinal direction; description of bedding soil
- Abstract
- Although the majority length of a liner pipe in sliplining rehabilitation is installed without excavation, some portions of the pipe are installed by the open-cut method at locations where connections cannot be made otherwise. The pipe undergoes a sudden change in loading condition, bedding condition and pipe ring composition when it passes through installation pits. A thorough understanding of these changes and how they affect the behaviour and performance of the installed pipe is necessary for effective designs that lead to satisfactory long-term performance. This paper presents an analysis of trenched and trenchless portions of grouted and ungrouted sliplined pipes. Liner pipe materials investigated include HDPE, PVC and reinforced fibreglass. Comparison are made between the trenchless and the trenched portions of the liner pipe in terms of loading, responses to load, effect of bedding and service life. A critical length is defined for the trenched portion in which joints should be avoided, and a practical formula is proposed for determining the critical length. The approach is illustrated by an example of a 915 mm (36.) HDPE sliplined watermain.