Full-scale experimental investigation of the mechanical characteristics of corroded buried concrete pipes after cured-in-place-pipe rehabilitation

Yang, Ke; Fang, Hongyuan; Bu, Junling; Zhang, Xijun; Li, Bin; Du, Xueming; Zhang, Zongyuan

doi:10.1016/j.tust.2021.104153

Cited by 22 publications

(5 citation statements)

References 30 publications

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“…Within their research, Roghanian and Banthia [31] studied non-reinforced cement coating and obtained approximately comparable results under a similar load test. However, in most cases, the object of the research is conventionally manufactured in factory reinforced concrete pipes directly [32,33], or the joint work of the coating and the host pipe [7,34,35]. Within these researches, reinforced concrete pipes can normally withstand significantly higher loads than those obtained in our case, as far as the investigated coating element is not a pipe, but is sprayedinplace directly to the restored pipe, which may certainly affect its strength characteristics.…”

Section: Resultsmentioning

confidence: 82%

The research of reinforced cement liner for reconstruction of water supply and sewer pipes

Makisha¹

2022

J Appl Eng Science

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The research is focused on the investigation of the features of mortar liner reinforced with composite mesh, which may be one of the possible options in case of one possible method of trenchless reconstruction of water and sewer pipes. The research had two goals: to study the strength under static loading of a mortar liner reinforced with a composite mesh frame and to define the maximum depth of underground location of a coating element, which is of significant importance if a host pipe cannot bear external loads any longer. Within the research, two specimens of coating with the length of 1000 mm and diameter of 800 mm were tested. The compression results showed that for both specimens the loss of bearing capacity occurred to the fluidity of composite reinforcement under the load of approximately 30 kN. After the strength test, a calculation was made to evaluate the maximum depth of liner location in case if a host pipe fully exhaustits bearing capacity. The results of the calculation showed that the maximum height of the soil layer above the crown of a pipe is 2.8 to 3.2 m depending on the type and features of the soil.

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Section: Resultsmentioning

confidence: 82%

The research of reinforced cement liner for reconstruction of water supply and sewer pipes

Makisha¹

2022

J Appl Eng Science

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Section: Introductionmentioning

confidence: 99%

“…The results were compared with the finite element, and the design model can accurately calculate the required liner thickness. To examine the mechanical characteristics of corroded concrete pipes after semi-structural rehabilitation of liner, a series of tests and finite element analyses were performed by Yang et al 26,27 The influence of traffic, surcharge, and fluid loads as well as cover depth on the mechanical properties of the pipe-liner composite structure was analyzed. Zhang et al 28,29 established a three-dimensional numerical model for concrete pipes with bell and spigot joints based on a full-scale test, and the mechanical properties of the pipes under different traffic loads were analyzed by them.…”

Section: Introductionmentioning

confidence: 99%

Mechanical response of concrete pipe rehabilitated by liner under external load: Analytical solution

Zhai,

Fang,

Wang

et al. 2023

Num Anal Meth Geomechanics

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Using pipe lines to rehabilitate concrete drainage pipes is a popular trenchless technique. In this paper, the concrete pipe and liner are equivalent to a symmetrical structural mechanics problem, and the mechanical solution of the composite structure is obtained using the force method. Subsequently, the analytical solutions are compared with the test and finite element results. The distribution law of axial force, bending moment, and shear force of the composite structure are obtained, and the circumferential strain law of the inner and outer surfaces of the host pipe is analyzed. Lastly, the influence of pipe diameter and liner thickness on the bearing capacity of the host pipe is examined. The results indicate that the axial and shear force distribution of the composite structure remains the same for different pipe diameters, as the distribution diagrams of shear and axial force along the circumferential direction coincide. While the elastic modulus and thickness of the liner have no effect on the internal force distribution of the composite structure, they do directly affect the stress state of the host pipe. Additionally, the bottom support causes abrupt changes in the bending moments and strains of the host pipe.

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“…Urban underground pipelines are commonly referred to as "underground lifelines" due to their critical role in facilitating urban sewage and rainwater discharge [1]. As an indispensable part of the infrastructures of cities, the importance of these pipelines cannot be overstated [2]. With the accelerated urbanization process in China, the development of urban underground drainage pipelines has also been rapid [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Mechanical Properties of Corroded Concrete Pipes before and after Cured-in-Place-Pipe Rehabilitation

Zhang

Yang

2023

Sustainability

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Cured-In-Place-Pipe (CIPP) rehabilitation technology is widely utilized in pipeline rehabilitation projects and has exhibited favorable results. Nevertheless, the mechanical characteristics of pipelines after CIPP rehabilitation and the effectiveness of CIPP rehabilitation in repairing these mechanical characteristics remain unknown. To address these issues, a three-dimensional numerical model of a corroded concrete pipe before and after CIPP rehabilitation was established in the present study. To authenticate the accuracy of the numerical model, the numerical simulation data were compared with the full-scale test data from prior research, and the comparison outcomes show that the numerical model formulated in this study is reasonable and reliable. To appraise the repair effectiveness of CIPP rehabilitation, the mechanical properties of a corroded pipe, a CIPP-repaired pipe, and a normal pipe under traffic load were computed and compared, and the comparison outcomes demonstrate that the stress in the pipe bell, stress in the pipe spigot, vertical displacement of the pipe crown, and vertical displacement of the pipe invert were reduced by 39.8%, 16.7%, 24.7%, and 24.4%, respectively, after CIPP rehabilitation. Moreover, a series of three-dimensional numerical models were constructed to scrutinize the impacts of factors such as corrosion degree, corrosion angle, and traffic load on the mechanical properties of corroded pipelines before and after CIPP rehabilitation. The findings indicate that the stress on the pipe escalates with increasing corrosion degrees and diminishes with increasing corrosion angles; there are no noteworthy differences between the vertical displacement of the pipe and the von Mises stress of the CIPP liner for diverse corrosion degrees and corrosion angles; the amplification of the traffic load will augment the stress and displacement of the pipe and increase the rotation of the pipe, resulting in a significant upsurge in the stress of the CIPP liner at pipe joints. When the traffic load magnitude rises from 0.7 MPa to 1 MPa, the stress and displacement of the pipe and the von Mises stress of the CIPP liner were increased by 18.9%, 42.3%, and 42.1%, respectively.

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Full-scale experimental investigation of the mechanical characteristics of corroded buried concrete pipes after cured-in-place-pipe rehabilitation

Cited by 22 publications

References 30 publications

The research of reinforced cement liner for reconstruction of water supply and sewer pipes

The research of reinforced cement liner for reconstruction of water supply and sewer pipes

Mechanical response of concrete pipe rehabilitated by liner under external load: Analytical solution

Numerical Study on Mechanical Properties of Corroded Concrete Pipes before and after Cured-in-Place-Pipe Rehabilitation

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