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Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method

A large number of drainage pipes and canals in China have been in disrepair for a long time and there have been problems such as leakage and corrosion. In response to these problems, this paper studies a non-excavation technology for repairing the arched canal structure—the in-situ spraying method....

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Autores principales: Zeng, Cong, Gong, Chenkun, Wang, Fuzhi, Zhu, Zihao, Zhao, Yahong, Ariaratnam, Samuel T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9325118/
https://www.ncbi.nlm.nih.gov/pubmed/35890558
http://dx.doi.org/10.3390/polym14142781
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author Zeng, Cong
Gong, Chenkun
Wang, Fuzhi
Zhu, Zihao
Zhao, Yahong
Ariaratnam, Samuel T.
author_facet Zeng, Cong
Gong, Chenkun
Wang, Fuzhi
Zhu, Zihao
Zhao, Yahong
Ariaratnam, Samuel T.
author_sort Zeng, Cong
collection PubMed
description A large number of drainage pipes and canals in China have been in disrepair for a long time and there have been problems such as leakage and corrosion. In response to these problems, this paper studies a non-excavation technology for repairing the arched canal structure—the in-situ spraying method. To study the influence of the original canal structure on the mechanical characteristics of the lining structure by in-situ spraying and the restraint effect on the lining structure, a field model test with a similar ratio of 1:2 was conducted in the field test pit. By conducting four stages of three-point concentrated load loading tests, the mechanical characteristics of the lining structure were investigated to reveal the influence of the canal structure on the force of the lining structure. The test results show that: the maximum crack width of the newly added lining structure is 0.27 mm and the normal service ultimate bearing capacity of the arched structure repaired by H-70 reaches 150 kN; comparing the loading test and the numerical simulation results, the difference between the two vault displacement results is 4.65% and the results are relatively consistent. The displacement of the bottom of the lining structure is small and the participation of the bottom plate is small, while the displacement of the upper arch structure of the lining is significantly larger than the lateral displacement, indicating that the canal structure can effectively limit the lateral displacement of the newly added lining and that the canal structure is greatly reduced. The bending moment of the lining structure is improved and the restraint effect on the arch foot is more obvious. This paper proposes the use of H-70 to repair arched canal structures by the in-situ spraying method and seeks to prove the feasibility of this method and fill the gap of research in this area. This paper provides the structural design basis and experimental knowledge for the construction of the repair method, which has important practical significance for the pipeline repair project in the future.
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spelling pubmed-93251182022-07-27 Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method Zeng, Cong Gong, Chenkun Wang, Fuzhi Zhu, Zihao Zhao, Yahong Ariaratnam, Samuel T. Polymers (Basel) Article A large number of drainage pipes and canals in China have been in disrepair for a long time and there have been problems such as leakage and corrosion. In response to these problems, this paper studies a non-excavation technology for repairing the arched canal structure—the in-situ spraying method. To study the influence of the original canal structure on the mechanical characteristics of the lining structure by in-situ spraying and the restraint effect on the lining structure, a field model test with a similar ratio of 1:2 was conducted in the field test pit. By conducting four stages of three-point concentrated load loading tests, the mechanical characteristics of the lining structure were investigated to reveal the influence of the canal structure on the force of the lining structure. The test results show that: the maximum crack width of the newly added lining structure is 0.27 mm and the normal service ultimate bearing capacity of the arched structure repaired by H-70 reaches 150 kN; comparing the loading test and the numerical simulation results, the difference between the two vault displacement results is 4.65% and the results are relatively consistent. The displacement of the bottom of the lining structure is small and the participation of the bottom plate is small, while the displacement of the upper arch structure of the lining is significantly larger than the lateral displacement, indicating that the canal structure can effectively limit the lateral displacement of the newly added lining and that the canal structure is greatly reduced. The bending moment of the lining structure is improved and the restraint effect on the arch foot is more obvious. This paper proposes the use of H-70 to repair arched canal structures by the in-situ spraying method and seeks to prove the feasibility of this method and fill the gap of research in this area. This paper provides the structural design basis and experimental knowledge for the construction of the repair method, which has important practical significance for the pipeline repair project in the future. MDPI 2022-07-07 /pmc/articles/PMC9325118/ /pubmed/35890558 http://dx.doi.org/10.3390/polym14142781 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zeng, Cong
Gong, Chenkun
Wang, Fuzhi
Zhu, Zihao
Zhao, Yahong
Ariaratnam, Samuel T.
Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title_full Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title_fullStr Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title_full_unstemmed Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title_short Study of the Structural Mechanical Properties of Drainage Canals Rehabilitated by Spraying Method
title_sort study of the structural mechanical properties of drainage canals rehabilitated by spraying method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9325118/
https://www.ncbi.nlm.nih.gov/pubmed/35890558
http://dx.doi.org/10.3390/polym14142781
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