• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.1012-1017
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• 2010

Sewer Pipes are not being managed for twenty years after laying. So, The life span of sewer pipes is on the decrease. For solve the life span decrease of sewer pipes, correct checking of questions and measure preparation are necessary through investigation in sewer pipes. This research investigated on the state of sewer pipes in the housing and industrial sites through CCTV(closed-circuit television) and device of digitalized strain investigation. And, a result is as follows. A results of PE, PVC, GRP, CSP investigations were found of pipe-transformation state by earth pressure and external load.

• 한국융합학회논문지
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• 제6권3호
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• pp.13-18
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• 2015

본 논문은 신축이음으로 배관과 배관사이에 연결되어 압력과 온도를 조절하는 이음의 안전설계에 관한 연구이다. 본 연구의 목적은 외기와 수송유체의 압력으로 인한 팽창과 수축에 의한 파이프 손상의 문제를 해결하고자 하여 파이프에 작용하는 과중한 압력을 감소시키고 사고발생을 예방하고자 하고자 한다. 3가지 유형의 신축이음을 적용하여 각각의 모델의 유동특성을 시뮬레이션 해석을 통하여 관찰한다. 각각의 모델의 형상에 따라 슬리브형, 벨로우즈형, 루프형의 신축이음 특성을 분류한다. 또한 수송 유체가 신축이음을 통과할 때, 배관에서의 열과 압력, 속도의 유동특성을 분석한다. 본 연구의 결과를 이용하면 신축이음 형상에 따른 안전설계에 기여할 수 있을 것으로 판단된다. 또한, 디자인 면에서 융합 기술로의 접목도 가능하여 미적인 감각을 나타낼 수 있다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.302-303
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• 2018

This study analyzed the major revision factors and revision contents for 'Construction-Standard-Production-Rate for Construction Works in 2018. Part 16. Pipe Laying Down and Connection" which was revised by the construction expense estimation standard's middle and long-term plans. The main reasons for the revision was analyzed to be unclear construction scope, limitations in applicable pipe material based on the facility type, labor force mainly composed of ordinary workers, limitations of labor force, and incomplete appropriation standard for the tool rent fee and equipment expenses. Through revision of factors, common items were newly established, organization was revised, the labor force was mainly composed of the technicians, and basis for appropriation of equipment expenses was arranged. In addition, through periodic revision, the appropriation standard for bend and special pipes was set. Consequently, more practical construction cost estimate standard is arranged through revision.

• 한국산학기술학회논문지
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• 제21권7호
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• pp.675-684
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• 2020

노후 인프라로 인한 각종 안전사고 발생과 수질관리 등으로 인하여 상·하수도 관에 대한 공사가 전국적으로 활발하게 진행 되고 있다. 하지만 현장에서는 공사비적용에 있어, 공사비기준의 개정내용을 분석하는 연구나 자료가 없어 어려움을 겪고 있다. 따라서, 본 연구에서는 관 부설 및 접합공사의 공사비산정을 위한 기준현황과 현장조사내용, 개정사항을 분석하였다. 주요 개정요인으로는 시공범위의 불분명, 시설물유형에 따른 배관 재질 적용한계, 보통인부 중심의 인력구성, 인력부설의 한계, 공구손료 및 기계경비 계상기준 미비로 분석되었다. 실제 현장조사를 통해 관종별 특징을 정하여 구분하였고, 양중장비와 경장비의 투입현황 등을 파악하였다. 또한, 관부설과 병행되는 터파기 및 검측에 대한 작업내용, 기능공 투입실태를 조사하였다. 그 결과, 공통사항의 신설을 통한 작업범위의 명확화, 관 재질별 편제구성, 기능공 중심의 인력비율 조정, 기계경비의 계상근거를 마련하였다. 더불어 관의 유지관리를 위한 관 세척 기준을 제정하였으며, 주기개정을 통한 곡관, 이형관의 계상기준을 명확히 하였다. 이러한 개정결과로 인한 공사비영향성을 분석한 결과 사업별로 약 1.28%의 공사비 절감효과가 나타났다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.328-332
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• 2011

The conclusion is derived from the arranged results and using a simulation by determining the shape of an optimum heat pump which is appropriate for small scale houses. It is concluded as 3 meters long for the laying depth of underground piping of the horizontal type geothermal heat pump system in regard to the 5 RT capacity standard that is suitable for a small scale house. The shape of the horizontal type geothermal heat pump system for a small scale house is theThree pipe shape whose trench length is short and pipe length laid in a trench is short. It is 9 for the number of laying pipes that is most appropriate to system.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1050-1059
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• 2010

The GFRP(Glass-Fiber Reinforced Plastic) Pipe is designed to behave safely against the external forces and to secure stability of deformation and settlements in pipe, Since it is laid under the ground. In this syudy, the evaluation for stability was carried out by performing the preliminary numerical analysis to decide the sclae effect in case of indoor model test. As a result of, strain of laying pipes is preponderantly reviewed. Numerical analysis is conducted to evaluate on the field application through the comparison concerning relations between deformation and differential settlement in the GFRP and hume pipes.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 전기설비
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• pp.115-117
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• 2005

The electrolytic protection is classified according to the current supplied. And there are the Sacrificial Anode System, the Impressed Current System, the Polarized Drainage System, the Forced Drainage System. This study is intended to design and analyze the electrolytic protection at water transmission pipes which is occurred the corrosion, and to show the methods protecting corrosions at water transmission pipes.

• 상하수도학회지
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• 제25권2호
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• pp.141-152
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• 2011

In this study, we extracted effective factors of pipe burst from the status data of water asset, operating data of pressure, volume and etc. and 7 years' pipe burst and repair records. The extracted factors were sorted by each attribution and then a statistical analysis was performed to generate a pipe burst probability function using the logistic regression model. As the result, material, diameter, length, laying year, pressure and road width affected to pipe burst significantly. Especially, in case of small diameter, laying year was most effective factor and in case of steel pipe, external loading was main cause of burst, and in case of cast iron, PE, PC, HP pipes, the deterioration of joint was main cause. The other side, as a result of Hosmer-Lemeshow goodness of fit test the models are turned out significant statistically. Also the classification criteria were determined to minimize the total cost from classification errors, when the predicted probability was more than 18% this pipe could have a chance of burst.

• Structural Engineering and Mechanics
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• 제41권6호
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• pp.805-822
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• 2012

Offshore pipelines have to withstand combined actions of tension and bending during deepwater installation, which can possibly lead to elliptical buckle and even catastrophic failure of whole pipeline. A 2D theoretical model initially proposed by Kyriakides and his co-workers which carried out buckling response analysis of elastic-plastic tubes under various load combinations, is further applied to investigate buckling behavior of offshore pipelines under combined tension and bending. In association with practical pipe-laying circumstances, two different types of loadings, i.e., bent over a rigid surface in the presence of tension, and bent freely in the presence of tension, are taken into account in present study. In order to verify the accuracy of the theoretical model, numerical simulations are implemented using a 3D finite element model within the framework of ABAQUS. Excellent agreement between the results validates the effectiveness of this theoretical method. Then, this theoretical model is used to study the effects of some important factors such as load type, loading path, geometric parameters and material properties etc. on buckling behavior of the pipes. Based upon parametric studies, a few significant conclusions are drawn, which offer a theoretical reference for design and installation monitoring of deepwater pipelines.

• 상하수도학회지
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• 제16권6호
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• pp.686-699
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• 2002

The purpose of this study is to estimate deterioration factors and weighting factors in pipe network which each local self-governments takes rehabilitation and replacement work present time. Deterioration factors in pipe network are able to effected of specific province or location related with water supply. Most of water supply pipes are laid under the ground, it is hard to quantify deterioration degree of water system. Moreover, the timing and economic limitation and insufficient information on the spot survey gives a difficulty to look over how old water supply system is. Accordingly, this study collects and analyses five data as the laying environment, visual analysis, analysis of soil contents, analysis of pipe material, and questionary survey data in water pipe of A city. The deterioration factor estimates 14 factors with excavation and experimental analysis and 9 factors without excavation and experimental analysis. Also, the weighting factors are estimated by using the multiple linear regressions and the linear programming. The estimated deterioration factor and weighting results are compared the analysis result of visual, pipe material, and soil contents with the Probabilistic Neural Network Model. Consequently, the model results of estimated 9 factors in this study and 14 factors show the 1-2% difference. The result show that the proposed model could be used to decide the deterioration condition of pipe line with real excavation and experimental analysis.