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<p>Even small-diameter pipelines can pose a significant risk to the overall system when sudden failures occur frequently. In this study, prior to the experiments, a field survey was first conducted in an area where frequent sudden failures of rigid polyvinyl chloride (PVC) pipelines with diameters of approximately 350&#xa0;mm or less have occurred. The conditions surrounding these failures were documented. Based on the findings of the survey, model experiments were carried out to examine the influence of joint stiffness on the stress generated in PVC pipes. The experiments simulated differential settlement of the surrounding ground and focused on investigating the stress and its generation mechanism around the joints. PVC pipes with a diameter of 89&#xa0;mm were used, and two types of joints were tested: adhesively bonded rigid joints and rubber-ring joints with a certain degree of extensibility. The results showed that, compared to the stress observed in adhesive joints, rubber-ring joints reduced stress to approximately 60% on the spigot side and 40% on the socket side. In the extensible joints, compressive stress developed along the pipe axis on the socket side, offsetting the tensile stress caused by bending, thereby suppressing stress generation. Furthermore, the axial bending behavior induced by settlement was found to influence the transverse deformation of the pipe, and this influence was more effectively mitigated in the case of rubber-ring joints. While the conditions of this study were simplified, it quantitatively demonstrated the effectiveness of joint extensibility in reducing stress in PVC pipes.</p>

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Effect of Joint Extensibility on Stress in Small-Diameter PVC Pipelines

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Yusuke Sonoda,
  • Shinichiro Shigeyoshi,
  • Kotone Tsujimoto,
  • Yutaka Sawada

摘要

Even small-diameter pipelines can pose a significant risk to the overall system when sudden failures occur frequently. In this study, prior to the experiments, a field survey was first conducted in an area where frequent sudden failures of rigid polyvinyl chloride (PVC) pipelines with diameters of approximately 350 mm or less have occurred. The conditions surrounding these failures were documented. Based on the findings of the survey, model experiments were carried out to examine the influence of joint stiffness on the stress generated in PVC pipes. The experiments simulated differential settlement of the surrounding ground and focused on investigating the stress and its generation mechanism around the joints. PVC pipes with a diameter of 89 mm were used, and two types of joints were tested: adhesively bonded rigid joints and rubber-ring joints with a certain degree of extensibility. The results showed that, compared to the stress observed in adhesive joints, rubber-ring joints reduced stress to approximately 60% on the spigot side and 40% on the socket side. In the extensible joints, compressive stress developed along the pipe axis on the socket side, offsetting the tensile stress caused by bending, thereby suppressing stress generation. Furthermore, the axial bending behavior induced by settlement was found to influence the transverse deformation of the pipe, and this influence was more effectively mitigated in the case of rubber-ring joints. While the conditions of this study were simplified, it quantitatively demonstrated the effectiveness of joint extensibility in reducing stress in PVC pipes.