• Title, Summary, Keyword: 하수관로

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Variability on Urban Runoff using SWMM Modeling According to the Sewer information Error (도시유역 하수관로 관망정보 오차가 SWMM 모형의 유출결과에 미치는 영향 분석 - 도림천 대상유역 -)

  • Hwang, Sung-Hwan;Kim, Min-Seok;Son, Hong-Min;Moon, Young-Il
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.18-18
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    • 2015
  • 현재 국내 도시유역의 유출분석을 위한 많은 모형들 중에서 SWMM 모형은 지표면의 양상, 침투율, 하수관망 체계를 고려한 유출분석이 가능하고, 계산과정에서 부등류를 해석함으로써 하류관로의 배수위 영향을 고려할 수 있는 장점을 가지고 있어 도시유출해석에 많이 이용되고 있는 실정이다. 지하시설물인 하수관로는 유지관리가 어려운 시설물 중 하나이다. 지하에 위치한 하수관망도는 상부 외압에 의한 토양의 유동과 미세한 토류의 변화 등으로 지속적으로 유동이 발생하고 있는 실정이다. 또한, 육안을 통한 조사가 어려운 지하시설물이기 때문에 하수관로 정보의 유지관리가 어려운 실정이다. 맨홀은 하수관거의 제원이 변화된 지점, 흐름방향 및 경사가 급격하게 변하는 지점 등에 위치하고 있어 하수관로 정보를 관리하는 있다. 지하시설물인 하수관로는 관리가 용이하지 않기 때문에 지반침하 등으로 관거의 평균경사 등이 변경될 수 있다. 본 연구에서는 하수관로 상류 및 하류 관저고의 변화에 따른 민감도를 분석하고자 한다. 대상 유역의 모든 관로에 대한 영향을 객관적으로 검토하기 위하여 도시적인 해석을 토하여 관거정보의 오차에 따라서 유출에 미치는 영향을 분석하고 이런 문제를 해결할 수 있는 방안 들을 정리하여 향후, 하수관로 정보의 신뢰성 확보를 위하여 하수관망 정보의 정밀도 문제를 검토하는데 도움이 되고자 한다.

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Analysis of Sewer Pipe Defect and Ground Subsidence Risk by Using CCTV and GPR Monitering Results (CCTV 및 GPR을 이용한 하수관로 결함 및 지반함몰 위험성 평가)

  • Lee, Dae-Young
    • Journal of the Korean Geosynthetics Society
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    • v.17 no.3
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    • pp.47-55
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    • 2018
  • Recently, increasing number of urban ground subsidence occurrences has been identified. This situation is mainly due to the increased number of underground cavities. This study is intended to develop the method that prevents ground settlement caused by deteriorated or damaged sewers, which are the main cause of land subsidence. To that end, GPR exploration was conducted using CCTV monitoring of deteriorated sewer at the location with high settlement potential. Through such CCTV monitoring and GPR investigation, abnormal ground behavior was monitored at the site where sewer was damaged, joint was cracked and soil was deposited. According to site investigation in this study, evaluation method using correlation analysis of CCTV monitoring and GPR investigation results is expected to prevent ground settlement attributable to damaged sewer.

Sewer CCTV Inspection Prioritization Based on Risk Assessment (위험도 기반의 하수관로 CCTV 조사 우선순위 결정 연구)

  • Son, Jooyoung;Lee, Jaehyun;Oh, Jeill
    • Journal of The Korean Society of Civil Engineers
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    • v.37 no.3
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    • pp.585-592
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    • 2017
  • Most sewer lines buried in the city are likely to be collapsed due to serious aging. Also, due to the high concentration of development and high population density and traffic, the collapse of the sewer will cause enormous social and economic damage. Therefore, proactive maintenance is required to prevent accidents caused by deteriorated sewer pipe. In order to utilize limited budget effectively, risk-based prioritization methods should be proposed that simultaneously consider the consequence of failure and the probability of failure. In this study, the method of risk-based prioritization of sewer was examined by reviewing various cases of overseas studies and applied to the urban sub-catchment. First, the impact factors that can be secured through the sewer GIS DB in Seoul were derived, and the weight, sub-criteria, and impact score of each impact factor were determined and the consequence of failure was calculated by weight sum method. In addition, the probability of failure was calculated by dividing the service life by the estimated useful life, and the consequence of failure and the probability of failure were classified into five grades by the Jenks natural breaks classification method. The prioritization method was applied to sub-catchment in the Seoul to derive a risk matrix and a risk grade. As a result, 26% of all subjects were selected as the inspection priority subjects with 4-5 risk grade. Therefore, using the risk-based CCTV prioritization methodology, it will be possible to systematically determine the objects that need investigation first.

Cause Analysis for Reduced Effect of Sewer Pipe Improvement Project Based On Investigation of Interceptor Sewers (차집관로의 조사 및 분석을 통한 하수관로정비 사업의 효과 감소 원인 분석)

  • Chae, Myungbyung;Bae, Younghye;Kim, Hungsoo
    • Journal of Wetlands Research
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    • v.20 no.3
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    • pp.219-226
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    • 2018
  • Interceptor sewer is installed underground near to the river side mostly ofstate-owned land and the management efficiency of public sewage disposal facilities is decreasing as too much infiltration/inflow(I/I) and river flow to interceptor sewer are caused by broken or deteriorated sewer. This also affects the sewer pipeline project and decreases its efficiency. Therefore, the aim of this study is to investigate interceptor sewer which has influence on the reduction of the project effect. The investigation were performed for three study areas. The study includes the investigation of current condition of interceptor sewer(sewer extension, pipe diameter, pipe type, installed year, installed locations, etc), investigation of inside of sewer by CCTV accompanied by pumping and dredging works where required, investigation of inside of manholes by eyes, calculation of pollutant load using the results of investigation of flow quantity and quality. Multipoint investigations were simultaneously performed for flow quantity at confluence area and other investigations were also performed for flow quantity and BOD for interceptor sewer and comparison of pollutant load, investigation of infiltration/inflow(I/I) caused by deterioration of interceptor sewer. As the result of the study, a main reason for reduced effect of sewer pipe improvement project was analyzed as the low-density sewage and I/I in public seweage treatment Facility due to deteriorated and unmanaged interceptor sewers.

Suggestion of the defect score and condition grading protocol about sewer pipe (하수관로 결함 점수 및 상태 등급 판정 방법 제안)

  • Kim, Jungruyl;Lee, Jaehyun;Oh, Jeill
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.1
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    • pp.21-28
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    • 2017
  • This study was performed to propose the sewer defect scoring, and grading protocols for sewer condition assessment. For this, sewer defect scoring methods were comparatively analyzed and reviewed for four international condition assessment protocols, which are established based on WRc manual. As a result, we proposed a new protocol for sewer condition assessment, in which characteristics of sewer pipes are considered by segment. In reference to the PIM-3, the extent of ground subsidence was adopted to be of importance, and renewal scores increased in accordance with weighting of defects causing structural backfill materials. Also, defect grades of 'Hole' were extended to 5 levels of the grading, and 'Surface Damage' was excluded in defect assessment. The addition of 'Buckling' resulted in reduction of weights in 'Surface Damage' and 'Lining Defects'.

Character Recognition of Low Resolution CCTV Images of Sewer Inspection (저해상도 하수관로 CCTV조사 영상의 문자인식)

  • Kim, Byeong-Cheol;Choi, Chang-Ho;Son, Byung-Jik
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.5
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    • pp.58-65
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    • 2016
  • Recent frequent occurrence of urban sinkhole serves as a momentum of the periodic inspection of sewer pipelines. Sewer inspection using a CCTV device needs a lot of time and efforts. Many of previous studies which reduce the laborious tasks are mainly interested in the developments of image processing S/W and inspection H/W. However there has been no attempt to find meaningful information from the existing CCTV images stored by the sewer maintenance manager. This study adopts a cross-correlation based image processing method and extracts location data of sewer inspection device from CCTV images. As a result of the analysis of time-location relation, it shows strong correlation between the device's stand times and the sewer damages. In case of using this method to investigate sewer inspection CCTV images, it will save the investigator's efforts and improve the sewer maintenance efficiency and reliability.

Development and Performance of Self-Propelled Vehicles for Repairing Concrete Sewage Pipes (콘크리트 하수관로 결함부 보수를 위한 자주차 개발 및 성능평가)

  • Park, Ji-Hun;Jung, Hoe-Won;Park, Hee-Woong;Yang, In-Hwan
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.3
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    • pp.372-378
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    • 2020
  • In this study, an experiment was conducted on the development and performance of self-propelled vehicles to repair defects in concrete sewage pipes. The self-propelled vehicle for a non-excavation repair for the sewage pipe defects was developed in consideration of the performance of the driving system, the feasibility of the repair unit, and the transportation of repair materials. In order to evaluate the performance of the developed self-propelled vehicle, a repair test was performed by simulating a defect at a connection between the main pipe and extruded one. The main sewage pipe was meade of concrete and its diameter was 500mm. Thereafter, watertightness performance was evaluated on the leakage at the repaired part. For watertightness performance, both ends of concrete sewage pipe and connected one was inserted by plugs, and then water was injected. The amount of leakage water measurement was 0.07L/㎡, indicating a value less than 0.2L/㎡ of the allowable leakage amount. Therefore, test results indicated that the self-propelled vehicle developed in this study exhibited excellent maintenance performance for repairing the sewage pipes.

Characteristics of Sewage Flow in Sewer Pipes Deposited with Cohesive and Non-cohesive Solids (점착성 및 비점착성 고형물이 퇴적된 관로 내 하수흐름의 특성 조사)

  • Lee, Taehoon;Kang, Byongjun;Park, Kyoohong
    • Journal of Convergence for Information Technology
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    • v.10 no.7
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    • pp.153-159
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    • 2020
  • In order to find out the condition of flow in sewer pipes, this study investigated the characteristics of tractive force of sewage flow estimated using actual measured values of water level, velocity, and flowrate in sewers located at uppermost portion in a treatment area during dry weather periods. When the scene of sewage flow was taken by CCTV after cohesive and non-cohesive solids (tofu and sand) were put on the sewer invert, it was found that the solids could be flushed without significant interruption. In sewer with slope of 0.00319, the frequency exceeding the minimum tractive force of sewage during a weekday was zero, while it was 10 per day with slope of 0.00603. During the week of the field observation, the event to exceed the minimum tractive force occurred once, suggesting that sewer odor would potentially increase. Maximum tractive force in sewer with steep slope was 2.9-3.1 N/㎡, but with gentle slope it decreased to 1.6-1.7N/㎡. It was also observed that the interval of time maintained below the criterion of minimum tractive force increased, during weekends compared to weekdays and for the sewage including non-cohesive particles which could enter combined sewers during a storm period. This study found that the sewer sediments formed by direct feces input into sewers, through sewer pipes which were designed meeting the standard sewer design criteria, could be flushed without staying as deposited solids state for a long time.

Analytical Evaluation of Influent Depending on the Occurrence of Rainfall by Case Study of Wastewater Treatment Facility (하수처리시설 사례 별 강우발생 유무에 따른 유입수 분석 평가)

  • Choi, Langkyu;Chung, Jin Do
    • Journal of Korean Society of Disaster and Security
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    • v.12 no.3
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    • pp.35-49
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    • 2019
  • Currently in 2018, Korea has over 600 operating sewage disposal facilities. The law requires a sewage treatment plant to treat 500 tons or more of water per day, and a small-decentralized sewage treatment facility in a community to treat 50 tons or more to less than 500 tons of water per day. However, most facilities fulfill neither the quantity nor the quality requirements from the original design for such reasons as inflow of rainwater and ground water due to deterioration of pipelines and unauthorized input of wastewater in the pipelines. The research has selected 2 representative cases among the technical diagnosif sewage pipelines in many regions within the country to use it as the baseline of: hourly flowrate and BOD water quality analysis in both clear and rainy days, proper plant operation through inflow rate and ratio calculation, and diagnostic evaluation for deterioration of the pipelines and their accessary structures. This also suggests facilities that treats 500 tons or more of inflow per day to sample and analyze the water hourly for 24 hours once a week in both clear weather and rainy weather considering the influence of rainfall on a regular basis.

Optimal Geophysical Exploration Performance Method for Common Detection Behind a Sewer (하수관로 배면 공동 탐지를 위한 최적 물리탐사 방법)

  • Kim, Jinyoung
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.8
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    • pp.11-17
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    • 2018
  • Recently, road subsidence has been increasing in urban areas, threatening the safety of citizens. In the lower part of the road, various road facilities such as water supply and drainage pipelines and telecommunication facilities are buried, and the deterioration of the facilities causes the road subsidence. Especially, in the case of old sewer which are attracting attention as a main cause of ground subsidence, the risk of subsidence is calculated indirectly through CCTV exploration. Currently, we are finding cavity through GPR exploration. However, it is difficult to find the sewer back cavity because it is explored from the surface of the road. Thus, the nondestructive cavity exploration techniques was investigated in this study and we confirmed the applicability through experiments on the test-bed. In this study a new quantitative method is proposed to detect the cavity around sewer.