Deterioration diagnosis of buried pipe using in-plane bending mode vibration

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14685
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Tokyo National College of Technology
• Principal Investigator: Takata Soichiro 東京工業高等専門学校, 機械工学科, 准教授 (30835517)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 埋設管 / 面内曲げ変形振動モード / 非線形振動 / 振動診断 / IoTセンサー

Outline of Final Research Achievements

The purpose is to establish a method for the deterioration diagnosis of buried pipes using the in-plane bending vibration mode of water pipes, in order to improve the maintenance efficiency of water pipes. The eigen frequency of the in-plane bending vibration mode has the characteristics of being linearly proportional to the thickness of the pipe, and is the vibration mode with the highest sensitivity to wall thinning due to corrosion. In this study, research were carried out with the goal of clarifying the vibration phenomenon of the in-plane bending vibration mode of the buried pipe under ground support and providing feedback to the diagnostic method.As a result, it was found that the in-plane bending vibration of the buried pipe represents behaviors such as a hardening spring characteristic and a softening spring characteristic depending on the soil moisture content of the buried soil.
Moreover, the implementation method of diagnosis algorithm to IoT sensor was considered.

Free Research Field

機械力学・計測制御

Academic Significance and Societal Importance of the Research Achievements

現状，埋設水道管の維持管理は漏水音調査に基づく事後保全方式による更新か更新周期による時間計画保全に頼っており，水道管の更新が追い付いていない．漏水音が生じている場合，時として断水につながるリスクを抱え，住民の生活を脅かす可能性を秘めている．本研究では，埋設管の現状品質を評価する手法を研究開発するものであり，現時点でまだ共用可能な水道アセットを棚卸し，また近い将来に漏水事故につながる水道管を洗い出し，効率的な維持管理に資するものである．