Life-Cycle-Cost Comparison of Trenchless and Conventional Open-Cut Pipeline Construction Projects

Najafi, Mohammad; Kim, Kyoung Ok

doi:10.1061/40745(146)61

Cited by 39 publications

(15 citation statements)

References 2 publications

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“…Therefore, the extra maintenance expenditures incurred due to unexpected high traffic volume are quantified by taking the difference between the estimated maintenance expenditures on alternative roads for the open cut and TT scenarios. This difference in maintenance expenditures represents agency cost savings and can be calculated using Equation (6).…”

Section: Social Cost Savings With Trenchless Technologymentioning

confidence: 99%

“…The main limitation of such studies is that various qualitative social and environmental impacts cannot be included in the assessment process. Najafi and Kim [6] reported that TT methods are more cost-effective than traditional OC methods based on their analysis, including social costs, for construction of pipelines in urban centers. Qualitative social impacts, such as loss of business and nuisance in the NWZCA due to diverted traffic, were not considered.…”

Section: Introductionmentioning

confidence: 99%

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Sustainability Assessment of Construction Technologies for Large Pipelines on Urban Highways: Scenario Analysis using Fuzzy QFD

et al. 2020

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Urban highways users frequently face disruptions due to construction and maintenance of buried infrastructure. In conventional open cut construction, social costs (vehicle operating and traffic delay costs) are generally high at work zone construction areas (WZCA). Municipalities also bear additional costs due to early maintenance of alternate routes, i.e., non-work zone construction area (NWZCA). Besides, work zone and non-work zone areas together experience significant potential socio-economic and environment impacts. In addition to minimal disturbance to existing socioenvironmental setting and user cost savings, trenchless construction result in agency cost savings by avoiding early maintenance at NWZCA. Past studies primarily focused on social costs associated to WZCA. In present research, a sustainability assessment framework has been developed that includes agency and user costs at both the work zone and non-work zone area. The framework evaluates various traffic detoured scenarios (for open cut construction) and trenchless technology scenario based on all three dimensions of sustainability. Fuzzy Quality Function Deployment (Fuzzy QFD) method has been used to incorporate the interaction between the agency’s sustainability objectives and public expectations for large-sized pipeline construction projects in urban areas. The framework effectively handles the uncertainties associated to data limitations and vagueness in expert opinion for subjective assessment criteria. To evaluate the pragmatism of proposed framework, it was applied on the case of a storm sewer construction project in Qassim Region, Saudi Arabia. Trenchless technology was found to be the most sustainable construction scenario followed by the open cut scenario with 50% traffic detoured to NWCA. The proposed methodology is also sought to enhance decision making process pertaining to the viability of trenchless technologies in KSA and elsewhere.

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Section: Social Cost Savings With Trenchless Technologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainability Assessment of Construction Technologies for Large Pipelines on Urban Highways: Scenario Analysis using Fuzzy QFD

et al. 2020

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“…Proposals have been made for sustainability criteria and assessment frameworks for urban infrastructure systems (e.g. Sahely et al, 2005), while others have provided evaluation criteria and indicators for alternative utility engineering practices (Ariaratnam et al, 2013;Jung and Sinha, 2007;Koo et al, 2009;Najafi and Kim, 2004), but none offers a comprehensive list of criteria across the three pillars of sustainability for utility streetworks projects in urban environments. To address this omission and to contribute to the body of knowledge in the field of sustainable infrastructure, the pre-appraisal version of the Arup SPeAR ® (Oasys, 2017) was adapted and the set of indicator systems modified to cover all aspects of utility streetworks for placement, rehabilitation, renewal and maintenance of UUI.…”

Section: Background: Sustainability Indicator Systems For Utility Infmentioning

confidence: 99%

Embedding sustainability criteria into pre-appraisal of underground utility for future cities

Hojjati

Jefferson

Metje

et al. 2017

Proceedings of the Institution of Civil Engineers - Urban Desig

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The underground utility infrastructure (UUI) will play a crucial role in meeting the demand for creating sustainable and resilient urban developments that are fit for purpose today and in the far future. The utility streetworks operations, an important feature of the UUI system, include placement, maintenance, rehabilitation, renewal and upgrading of UUI, which can have adverse economic, social and environmental impacts. A key challenge, and one that will lead to lost opportunities for the best use of the near surface for utility provision for future cities, is the lack of a sustainability indicator system and assessment method for evaluating different utility streetworks solutions. To address this shortfall, this paper presents a new suite of indicators, or performance criteria, bespoke to utility streetworks projects as well as a pre-appraisal method based on the adaptation of the Arup SPeAR ® sustainability evaluation framework. An example of the application of the modified system is provided for a trenchless against trenching case study, and the lessons that flow from this are discussed in the wider context of the synthesis of utility service operations into sustainable, resilient, smart and liveable cities of the future.

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“…노후화된 하수관은 교체되어야 하지만 일반적인 굴 착공사는 도로 교통과 시민의 통행을 방해하고, 장시 간 하수도 사용에 불편을 주는 등의 사회적 비용을 발 생시키기 때문에 가능하면 비굴착 공법으로 보수하여 사용연한을 증가 시키는 것이 바람직하다. 비굴착공사 는 굴착공사에 비해 교통 통제가 없고 (Gangavarapu et al, 2003), 민원과 환경 영향이 적으며 (Cohen, 2013), 사고 위험이 적고 (Kamat, 2011), 생산성 (Jung and Sinha, 2007)과 경제성이 높은 (Najafi and Kim, 2004) 장점을 가지고 있다. 비굴착 선진국에서는 비굴착 보 수 및 갱생 공법으로 pipe bursting, slip-lining, modified cross section liner 등 다양한 방법들이 활용되고 있으나 (McKim, 1997), 국내에서는 현장경화관(Cured-In-Place-Pipe; CIPP)을 주로 사용한다.…”

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Study of structural properties and development of high strength Cured-In-Place Pipe (CIPP) liner for sewer pipes using glass fiber

Ji¹,

Koo²,

Yoo³

et al. 2020

J. Korean Soc. Water Wastewater

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Cured-in-place-pipe(CIPP) is the most adopted trenchless application for sewer rehabilitation to extend the life of the existing sewer without compromising both direct construction and indirect social costs especially applied in the congested urban area. This technology is globally and domestically known to be the most suitable for partial and full deteriorated pipe structure rehabilitation in a sewer system. The typical design of CIPP requires a significant thickness of lining to support loading causing sewage flow interruption and increasing material cost. This paper presents development of a high strength glass fiber composite lining material for the CIPP application and structural test results. The test results exhibit that the new glass fiber composite lining material has 12 times of flexural strength, 6.2 times of flexural modulus, and 0.5 Creep Retention Factor. These test results can reduce lining design thickness 35% at minimum. Even though taking into consideration extra materials such as outer and inner films for actual field applications, the structural capacity of the composite material significantly increases and it reduces 20 percent or more line thickness as compared to the conventional CIPP. We expect that the newly developed

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Life-Cycle-Cost Comparison of Trenchless and Conventional Open-Cut Pipeline Construction Projects

Cited by 39 publications

References 2 publications

Sustainability Assessment of Construction Technologies for Large Pipelines on Urban Highways: Scenario Analysis using Fuzzy QFD

Sustainability Assessment of Construction Technologies for Large Pipelines on Urban Highways: Scenario Analysis using Fuzzy QFD

Embedding sustainability criteria into pre-appraisal of underground utility for future cities

Study of structural properties and development of high strength Cured-In-Place Pipe (CIPP) liner for sewer pipes using glass fiber

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