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공명식 ( Myeongsik Kong ),곽필재 ( Pilljae Kwak ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.6
Nondestructive diagnostic technology can be used to check for abnormalities such as metal loss, deformation, and cracks in water pipelines. However, new standards and guidelines for water pipeline maintenance must be revised or established in order to apply new technologies such as nondestructive diagnosis to the field. Herein, policies and guidelines are proposed for the diagnosis of water pipelines using nondestructive technology. Amendments are proposed to allow accurate and reliable nondestructive diagnostic technology to be applied to pipeline maintenance by reviewing the diagnostic standards and laws for water pipelines. The design standards for water conveyance, water transmission, and water distribution pipelines have been revised in order to use advanced technologies such as nondestructive technology to identify abnormalities while minimizing the impact on facilities when inspecting and diagnosing water pipelines. In addition, a revision of the detailed guidelines of the Ministry of Land, Infrastructure, and Transport according to the KS and ASTM standard is required to allow for the use of nondestructive equipment when inspecting welds. Nondestructive diagnostic guidelines that summarize the characteristics and performance of nondestructive diagnostic equipment, diagnostic procedures, and verification processes are also proposed to help managers understand the technology and easily apply it in the field when diagnosing water pipelines.
공명식(Myeongsik Kong),강재모(Jaemo Kang) 한국지반환경공학회 2021 한국지반환경공학회논문집 Vol.22 No.11
도심지 지하에 매설된 열수송관 등 지하매설관이 점차 노후화함에 따라 파손에 의한 인적, 경제적 피해가 증가하고 있다. 외부로 노출되지 않아 파손 등 문제점을 즉시 확인하기 어려운 열수송관의 특징을 고려할 때, 시설물 유지관리를 통해 주기적으로 수집하는 이력정보를 기반으로 시설물의 상태를 간접적으로 확인하는 방법이 현실적이다. 본 논문에서는 열수송관 이력정보를 검토하여 파손확률과 연관성을 가지는 평가인자를 도출하고, 이를 통해 파손확률을 추정하는 방법론을 제시하고자 한다. 파손확률 추정을 위한 영향인자는 유럽의 사례, 국내 열수송관 관리기준 등을 분석해 도출하였으며, 데이터의 확보 가능성도 함께 고려하여 선정하였다. 열수송관 설치기준이 변경된 1999년을 기준으로 매설시기에 따라 2가지 파손확률 추정 함수를 달리 제시하고 관경, 용도, 관리주체 등 평가인자별 정보에 따른 가중치를 부여하여 파손확률을 보정하여 파손확률추정의 신뢰성을 확보하였다. Losses of both life and property increased from damage to underground pipe such as heat transmission pipe buried underground in downtown because pipes are gradually aging. Considering the characteristics of the heat transmission pipe, which is not exposed to the outside and difficult to immediately identify problems such as damage, it is realistic to indirectly check the condition of the facility based on the historical information that is periodically collected through facility maintenance. In this study, a methodology for estimating the damage probability was developed by examining the history information of the heat transmission pipe, deriving an evaluation factor that is related to the damage probability. The contribution factor of the damage probability were reviewed by analyzing not only the guidelines for maintenance of heat transmission pipe of advanced European countries and domestic district heating companies, but also the cases of waterworks with similar characteristics. Evaluation factors were selected by considering not only the correlation with the damage probability but also the possibility of securing data. Based on 1999, when the construction technology and standards of heat transmission pipe changed, the damage probability estimation function according to the period of use was divided into the case of being buried before 1998 and the case of being buried after 1999, and presented. In addition, the damage probability was corrected by assigning weights according to the measured data for each evaluation factor such as the diameter, use, and management authority.
강재모(Jaemo Kang),이성열(Sungyeol Lee),김진영(Jinyoung Kim),공명식(Myeongsik Kong) 한국지반환경공학회 2024 한국지반환경공학회논문집 Vol.25 No.1
Ground subsidence mainly occurs in urban areas with high population density, so it is necessary to clearly identify the cause of occurrence and prepare in advance. The main cause of ground subsidence is reported to be the creation of cavities in the ground due to damage to underground pipes, but the property information and influencing factors of underground pipes to predict and prepare for ground subsidence are not properly established. Therefore, in this study, factors showing a significant correlation with the occurrence of ground subsidence were selected among the underground facility property information and a regression equation was proposed through logistic regression analysis. For this purpose, data on underground structures and ground subsidence history information in the target area were collected, and the target area was divided into girds of 100m x 100m in size using QGIS. The underground facility attribute information and ground subsidence history information contained within the gird were extracted. Then, preprocessing was performed to construct a dataset and correlation analysis was performed. As a result, factors excluding the year of sewer pipes and communication pipes and the average depth of communication pipes, heat pipes, and gas pipes were found to have a significant correlation with ground subsidence. In addition, a regression equation for whether ground subsidence occurred in the target area is proposed through logistic regression analysis.
이성열 ( Sungyeol Lee ),강재모 ( Jaemo Kang ),김진영 ( Jinyoung Kim ),공명식 ( Myeongsik Kong ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
인구밀도가 높은 도심지를 중심으로 지반상부가 붕괴되는 현상인 ‘지반함몰’이 빈번하게 발생하여 사회적인 문제가 되고 있다. 지반함몰의 주요원인은 지반에 매설된 지중매설관의 손상으로 보고되었으며, 매설관의 손상부로 주변 토립자가 유실되어 공동이 형성되는 메커니즘을 보이고 있다. 따라서 지반함몰 사고에 대비하기 위해서는 지중매설관 정보를 활용하여 지반함몰 위험도를 예측해야한다. 이를 위해서는 지반함몰에 유의미한 영향을 미치는 지중매설관의 속성정보를 파악해야한다. 본 연구에서는 도심지의 지중매설관 속성정보와 지반함몰 발생이력을 활용하여 공간회귀분석을 통해 지반함몰 영향인자를 선정하였다. 공간회귀분석은 공간시차모형(SLM)을 활용하였다. 또한, 지중매설관은 상수, 하수, 가스, 전기, 통신, 난방으로 총 6종의 구경, 평균심도, 노후년도, 밀집도를 활용하였다. 그 결과, 지중매설관의 밀집도가 가장 높은 상관성을 보이는 것으로 나타났으며, 전기관의 노후년도와 통신과로의 평균심도 및 노후년도을 제외한 모든 속성정보가 지반함몰과 유의미한 상관성을 보이는 것으로 나타났다. 본 연구의 결과는 도심지 지반 함몰의 위험도 예측을 위한 모델 구축에 활용 가능 할 것으로 판단된다.