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현장시험을 통한 이중보온관 되메움 대체재료에 관한 연구
최봉혁(Choi Bong-Hyuck),김진만(Kim Jin-Man),유한규(Yoo Han-Kyu) 대한토목학회 2012 대한토목학회논문집 C Vol.32 No.1
본 논문에서는 이중보온관의 다짐시공 중 안정성 평가 및 되메움 대체재료 제시를 위하여 현장시험을 수행하였다. 현장시험 시 사용된 되메움 재료는 기존 되메움 재료인 중사와 되메움 대체재료 평가를 위한 자연모래 2종(세사, 왕사)과 부순모래, 자갈 2종(10mm, 20mm)을 사용하였다. 현장시험은 되메움재료 별 이중보온관 토압 및 변형, 외관손상 등의 거동특성 평가를 위하여 수행하였다. 연구결과에 따르면, 부순모래는 6종의 되메움 대체재료 별 평가결과 이중보온관에 미치는 공학적 특성 및 재료의 수급 측면에 있어 기존 중사를 이용하는 이중보온관 되메움재의 대체재료로 가장 합리적인 재료로 평가되었다. In this study, field tests were performed to evaluate the stability of pre-insulated pipe during the compaction operation and to recommend an alternative backfill material. Three types of natural sand (fine-grained and medium-grained, coarse-grained sand), crushed sand and two types of gravel (10 mm, 20 mm) were used as backfill material in the field tests. Field tests were performed to determine the behavior (earth-pressure and deformation, installation damage) of the pre-insulated pipe due to variation of different types of backfill material. Based on the evaluation and comparison of field test results, it was determined that crushed sand is the most suitable back-fill material that can be used as an alternative for medium grained sand for pre-insulated pipes with respect to the engineering behavior and material supply.
수치해석을 이용한 이중보온관 발파진동 관리기준에 관한 연구
최봉혁,조진우,김진만,유한규,Choi, Bong-Hyuck,Cho, Jin-Woo,Kim, Jin-Man,Yoo, Han-Kyu 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4
본 논문에서는 이중보온관의 발파진동 관리기준 제시를 위하여 이격거리와 매설심도를 변수로하여 수치해석을 수행하였다. 수치해석 적용 발파하중 모델은 현장시험 결과와의 비교를 통하여 검증하였다. 수치해석 결과, 이중보온관은 진동속도 4.0cm/sec 이상에서 발생 유효응력이 내관의 허용응력을 초과하거나 근접하는 것으로 나타났으며, 4.0cm/sec 이하에서 안정성이 확보되는 것으로 평가되었다. 따라서, 이중보온관의 진동관리기준은 4.0cm/sec를 초과하지 않도록 관리하여야 할 것으로 판단된다. In this paper, numerical analysis with varying distance and burial depth was performed to recommend the blasting vibration control standard for pre-insulated pipes. The blasting load model applied in the numerical analysis was verified to the comparison with the results of the field tests. It was determined from the results of the numerical analysis that the effective stress either exceeds or approaches the allowable stress of the inner steel pipe for vibration velocity greater than 4.0cm/sec while stability is obtained for vibration velocity below 4.0cm/sec. Therefore, it was determined that the blasting vibration control criteria for pre-insulated pipes must not exceed 4.0cm/sec.
저온 지역난방용 플렉시블 트윈 이중보온관의 열손실율 분석
우스만 무하마드(Muhammad Usman),김용기(Yong Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to analyze the heat loss rate of the flexible twin insulated pipe installed at a micro district heating demonstration site for the low temperature district heating supply. Hot water is produced from the solar thermal collectors and stored in a 40m³ heat storage tank. The heat from the produced hot water is transferred to the heat storage tank with storage capacity of 10m³ via heat exchanger through flexible twin insulated pipe having internal diameter of 32mm. The heating water from 10m³ is then supplied to meet the heat load of a building using Fan Coil Units(FCU). The flexible twin pipe is buried in the ground at a depth of about 0.3m. The distance between 40m³ heat storage tank and 10m³ heat storage tank is about 235m making the total distance of about 470m from the supply point to the return point. Heat losses are calculated for heating water supply temperatures of 50°C, 60°C and 70°C. The results show that the average heat loss using flexible twin pipe is about 10.6%.
저온 지역난방용 플렉시블 트윈 이중보온관의 열손실율 분석
우스만 무하마드(Muhammad Usman),김용기(Yong Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to analyze the heat loss rate of the flexible twin insulated pipe installed at a micro district heating demonstration site for the low temperature district heating supply. Hot water is produced from the solar thermal collectors and stored in a 40m³ heat storage tank. The heat from the produced hot water is transferred to the heat storage tank with storage capacity of 10m³ via heat exchanger through flexible twin insulated pipe having internal diameter of 32mm. The heating water from 10m³ is then supplied to meet the heat load of a building using Fan Coil Units(FCU). The flexible twin pipe is buried in the ground at a depth of about 0.3m. The distance between 40m³ heat storage tank and 10m³ heat storage tank is about 235m making the total distance of about 470m from the supply point to the return point. Heat losses are calculated for heating water supply temperatures of 50°C, 60°C and 70°C. The results show that the average heat loss using flexible twin pipe is about 10.6%.
저온 지역난방용 플렉시블 트윈 이중보온관의 열손실율 분석
우스만 무하마드(Muhammad Usman),김용기(Yong Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to analyze the heat loss rate of the flexible twin insulated pipe installed at a micro district heating demonstration site for the low temperature district heating supply. Hot water is produced from the solar thermal collectors and stored in a 40m³ heat storage tank. The heat from the produced hot water is transferred to the heat storage tank with storage capacity of 10m³ via heat exchanger through flexible twin insulated pipe having internal diameter of 32mm. The heating water from 10m³ is then supplied to meet the heat load of a building using Fan Coil Units(FCU). The flexible twin pipe is buried in the ground at a depth of about 0.3m. The distance between 40m³ heat storage tank and 10m³ heat storage tank is about 235m making the total distance of about 470m from the supply point to the return point. Heat losses are calculated for heating water supply temperatures of 50°C, 60°C and 70°C. The results show that the average heat loss using flexible twin pipe is about 10.6%.