![Section with host pipe and new liner pipe [7]](https://www.researchgate.net/publication/325611670/figure/fig1/AS:635148085235713@1528442512436/Section-with-host-pipe-and-new-liner-pipe-7_Q320.jpg)
![Non-circular section with host pipe and new liner pipe [8]](https://www.researchgate.net/publication/325611670/figure/fig2/AS:635148085256192@1528442512496/Non-circular-section-with-host-pipe-and-new-liner-pipe-8_Q320.jpg)
![Static examination of the old sewer [10]](https://www.researchgate.net/publication/325611670/figure/fig3/AS:635148085260289@1528442512522/Static-examination-of-the-old-sewer-10_Q320.jpg)
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Relining of pipe systems: conditions, benefits and application through case-study
Abstract and Figures
Relining is one of the best alternatives available today for pipe system rehabilitation. This trenchless solution is particularly interesting for urban agglomerations, as a smaller diameter pipe is pushed or pulled through the old pipeline. Relining creates a leak-tight “pipe within a pipe” system, which is as good as new in both structural and hydraulic terms. Relining can be performed with both circular and special, non-circular (NC) profiles. The latter is especially advantageous for the rehabilitation of old sewers, many of which were constructed in a variety of ovoid-like shapes. This paper presents the typical steps that are performed for pipeline rehabilitation with non-circular profiles, as well as an applied case study (a project implemented in the city of Würzburg in Germany).
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The impact that the lack of investment in water infrastructure will have on the performance of aging underground infrastructure over time is well documented and the needed funding estimates range as high as $325 billion over the next 20 years. With the current annual replacement rate averaging 0.5%, pipes would be expected to last for 200 years, but most pipes are designed for 50 or 100 year life cycles. While this replacement rate may be sufficient in the immediate term because pipes are still relatively young, as systems grow older, the necessary replacement rates will inevitably increase. In addition to the necessary funding, congestion above and below ground is making the replacement of water mains more difficult for utility owners as is the lack of public tolerance for the disruption caused by construction work. There is an increasing availability of technologies for rehabilitation of existing pipes, which provides solutions that minimize or alleviate these problems, while providing realistic and potentially cost-effective alternatives to traditional open cut replacement. The primary objectives of the report are:
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To review current and emerging rehabilitation technologies for water distribution mains and services.
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To understand the needs of water utilities for renewal of their infrastructure and to identify technology gaps that should be addressed in order to meet these needs.
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To identify key performance parameters for various rehabilitation technologies and to gather and document this information for rehabilitation technologies that are available for use in the market.
This report contains a comprehensive review and evaluation of existing and emerging renewal technologies for water distribution system mains and services. This report covers technologies used for the repair, rehabilitation, and replacement of water mains and service lines. The available technologies for water pipeline renewal leave “gaps” in terms of certain needs that are unmet that fall into two main categories: data gaps in terms of knowledge of the existing pipe condition; and capability gaps in terms of the available renewal technologies. Accurate data on pipe condition is necessary for the successful selection and design of renewal technologies. Data gaps relate to the amount and/or quality of direct physical inspection data on a pipe, which may be obtained either externally or internally. Obtaining external data requires costly excavation, while internal data can be obtained over the full internal surface area of the pipe, but this typically requires the main to be shutdown and dewatered.
Capability gaps remain, despite the available rehabilitation technologies generally meeting renewal needs. Reopening service connections after lining still requires excavation with some technologies at each connection location and where service connections are frequent; this becomes as disruptive as a full-length excavation. Operational aspects such as access requirements and the length of time that the main is out of service are also areas where gaps exist between capability and customers’ needs. A gap also remains in the understanding of the long-term performance of various rehabilitation technologies and their materials. These materials and methods have been introduced recently and therefore their installed performance has not been studied over time.
To overcome the gaps identified, it is recommended that innovative rehabilitation technologies be demonstrated in field conditions and measured against a clearly defined set of performance criteria. An additional research need is to identify accelerated aging test protocols that would help system owners to predict the long-term performance of the products and technologies used. It is also recommended that a retrospective analysis of water main rehabilitation materials be conducted to understand service life performance of field-installed materials. These data, along with the documented performance evaluation from a demonstration program, would be essential in providing utility decision makers with the information needed for selecting technologies and materials that meet their needs.
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The infrastructure of the nation is a public’s asset. The United States has approximately4,000,000 miles (6,437,376 kilometers) of roadway, making it the largest in the worldwith millions of culverts hidden underneath. As the philosophical saying, “out of sight isout of mind,” there has been more atten tion and maintenance work for above-groundinfrastructure, while the underground infrastructu re is failing due to lack of maintenanceand proper asset management practices. The underground infrastructure addressed in thisproject consists of pipes, culverts, and dr ainage structures, wh ich were constructedseveral decades ago by various state Depa rtments of Transportations (DOTs) andgovernment agencies. Most DOTs currently do not have proper pr otocols to identifylocation, investigate condition and maintain these underground assets. Some recentculverts failures in Michigan, North Carolina , California, Utah, a nd so on, are examplesof the seriousness of culvert asset management problems.This project focuses on culverts and drainage structures, and develops a model for culvertinventory and inspection. The model consists of a framework that includes strategies andguidelines on how these hidden assets can be tracked and maintained. The ConditionAssessment Protocol evaluates the overall condition of the culvert and drainage structuresto provide a base for culvert renewal decision-making process. By implementing aneffective condition assessment, government agencies can make proper decisions onwhether to repair, rehabilitate (renew) or replace deteriorated culverts. After the culvertrenewal, the agencies need to continue the recommended asset management process byperiodic inspections.As a part of this project, investigators also examined the inventory and inspectionprocedures employed in Ohio. The recently published Ohio Culvert Management Manualis addressed. Different repair, renewal a nd replacement methods employed for culvertsare studied and connected to the inspection results through a decision support platform.
Rehabilitation of a watermain by grouted sliplining is usually carried out when the existing pipe is only partially deteriorated. Although designs that neglect the structural contributions from the existing pipe and the grout are generally conservative, the performance of the rehabilitated pipe needs to be better understood for effective design and management of buried water pipes. Presented in this paper is a practical method for the determination of load sharing and circumferential stresses in a sliplined pressure pipe. The laboratory tests show that the load carrying capacity of a cast iron pipe increases substantially after it is sliplined and grouted. Results also indicate that the eccentricity between the host pipe and the inserted pipe and the direction of eccentricity have an impact on the rupture load of the sliplined pipe. The effects of the host pipe wall thickness and the grout strength are also discussed. Although the method is based on a pressurized watermain, it can be used to assess the load carrying capacity of a non-pressurized pipe such as a sewer pipe. The use of this method is demonstrated through an example.
This paper presents the measured mechanical and thermal performances of an HDPE sliplined cast iron watermain based on two and a half years of monitoring. The data were acquired from strain gauges installed on the host cast iron pipe and on the new HDPE pipe to monitor the short- and long-term field performance of the HDPE sliplined watermain. Ce document présente les mesures des performances mécaniques et thermiques d'une conduite maîtresse en fonte à tubage en polyéthylène haute densité (PEHD), fondées sur un programme de surveillance ayant duré deux ans et demi. Les données ont été acquises à partir de jauges extensométriques que l'on a installées sur le tuyau en fonte récepteur et sur la nouvelle conduite en PEHD, dans le but de surveiller la performance in situ à court terme et à long terme de la conduite maîtresse à tubage en PEHD. RES
Sliplining is a trenchless pipe rehabilitation technology that offers many advantages compared with traditional open-cut and cover methods. This Update presents information on sliplining installation, performance and cost, based on recent work at NRC's Institute for Research in Construction. Le tubage est une technologie de réhabilitation sans tranchée des conduites, qui offre de nombreux avantages par rapport à la méthode traditionnelle d'excavation. Ce numéro renferme des informations sur la réalisation, la performance et les coûts du tubage, tirées d'un projet récent mené par l'Institut de recherche en construction du CNRC. PRAC
Rehabilitation of a watermain by grouted sliplining is usually carried out when the existing pipe is only partially deteriorated. Although designs that neglect the structural contributions from the existing pipe and the grout are generally conservative, the performance of the rehabilitated pipe needs to be better understood for effective design and management of buried water pipes. Presented in this paper is a practical method for the determination of load sharing and circumferential stresses in a sliplined pressure pipe. The laboratory tests show that the load carrying capacity of a cast iron pipe increases substantially after it is sliplined and grouted. Results also indicate that the eccentricity between the host pipe and the inserted pipe and the direction of eccentricity have an impact on the rupture load of the sliplined pipe. The effects of the host pipe wall thickness and the grout strength are also discussed. Although the method is based on a pressurized watermain, it can be used to assess the load carrying capacity of a non-pressurized pipe such as a sewer pipe. The use of this method is demonstrated through an example.
Final Report Summary Novel Technology for Low Cost Re-lining of Pipe Infrastructure, Italian Association for Trenchless Technology (IATT), CORDIS European Commission's Portal
- S Bianchi
Bianchi S., Final Report Summary Novel Technology for Low Cost Re-lining of
Pipe Infrastructure, Italian Association for Trenchless Technology (IATT), CORDIS
European Commission's Portal, pp.1, 2014
Non-Circular Profiles
- Product Catalogue
- Line
Product catalogue, NC Line. Non-Circular Profiles, HOBAS Pipes International
GmbH, 2014
How to select the proper relining method for your work, Trenchless Technology - Pipe Relining Supplement
- J C Matthews
Matthews J.C., How to select the proper relining method for your work,
Trenchless Technology -Pipe Relining Supplement, pp.14, 2013