• Title, Summary, Keyword: sewer pipeline

Search Result 18, Processing Time 0.053 seconds

Risk analysis of road cave-in of storm sewer lateral using zoom camera (줌카메라를 활용한 빗물받이 연결관의 도로함몰 리스크 분석)

  • Han, Sangjong;Hwang, Hwankook
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.28 no.6
    • /
    • pp.681-690
    • /
    • 2014
  • It is known that sewer problems are the major causes of road cave-in. The objective of this study is to analyze the risk of road cave-in due to storm sewer laterals. We investigated 174 storm sewer laterals using a zoom camera at O-dong area in Seoul. The causes of road cave-in were classified into five cases: breakage of rigid pipe, deformation of flexible pipe, out of pipeline alignment, changing pipe material or changing pipe diameter, and a poor linkage between lateral and sewer. In addition, all defects were sorted into five grades based on the severity rating at storm sewer laterals. In this study, the most fragile pipe materials were found to be concrete pipe and polyethylene pipe, which recorded 2.3 and 1.69 defect rates. With regard to the causes of road cave-in, deformation of flexible pipe has a large influence on road cave-in at present. On a long-term basis, the two causes, out of pipeline alignment and a poor linkage between lateral and sewer, could have more influence on road cave-in.

Characterization of Repairing Polyurethane for Trenchless Sewer Pipeline (비굴착 하수관로용 폴리우레탄 보수재 특성 평가)

  • Park, Jun-Ha;Jeon, Sang-Ryeol;Lee, Kwan-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.5
    • /
    • pp.3542-3547
    • /
    • 2015
  • There is commonly used the full depth excavation method of sewer pipeline maintenance in Korea. This induces couple of technical and social problems like increase of construction cost and time for excavation and backfill, increase of public complains and delay of traffic, and so force. In order to overcome these problems, lots of laboratory tests were carried out for sewer pipeline of maintenance materials with trenchless methods. The testing materials are liquid and hardened polyurethane, and polyurethane CIPP. The lab tests were followed by Korean Standard. There are no side effects, like harmless to the human body and air pollution with stink. Judging from the limited test results, all the items tested were satisfied the KS criteria.

Prediction of structural behavior of PVC sewer manhole (PVC 하수맨홀의 구조적 거동 및 예측)

  • Kim, Sunhee;Cho, Jinkyu;Joo, Hyungjung;Kim, Yongsoo;Yoon, Soonjong
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.28 no.4
    • /
    • pp.491-500
    • /
    • 2014
  • Due to rapid urbanization and industrialization, water supply and sewer line systems are also developed relevantly. Manhole is an essential component structure of the pipeline system. Manhole is a structure constructed to accommodate the direction, dimension, differences in level, and easy of maintenance in the pipeline system. In this paper we present the result of investigations pertaining to the structural behavior of PVC sewer manhole buried underground. In the paper mechanical properties of PVC material are reported. In addition, by the finite element analysis (FEA), we confirmed that a PVC double-wall corrugated pipe manhole, when it is buried underground, is safe for the stress as well as buckling strength if the manhole is constructed within the suggested limit of buried depth.

Failure Risk Assessment of Reinforced Concrete Sewer Pipes on Joint-Related Defects (원심력철근콘크리트관의 결함에 따른 심각도 평가 -이음부 사례를 중심으로-)

  • Han, Sangjong;Shin, Hyunjun;Hwang, Hwankook
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.27 no.6
    • /
    • pp.787-796
    • /
    • 2013
  • Sewer joint-related defect is one of the most common domestic sewer defects along with the lateral pipe problem. However, there are currently no criteria that precisely assess the joint-related sewer defects. Therefore, this study examined the joint-related sewer defects found in domestic circumstances, classified them according to the suggested defect code, and presented the examples of defect pictures. Each defect code was organized as the process of out of pipeline alignment (OPA) which shows the progress in deterioration. Each defect was classified into 5 grades depending on appropriate repair and rehabilitation method. The result of this study is expected to be useful for domestic CCTV inspectors to assess the sewer condition and helpful for managers to make a decision of repair and rehabilitation.

A Study on the Improvement Methods for Water Supply Facility Management System Implementation by GIS (GIS 기반 상수도 관망관리시스템 구축의 개선 방안에 관한 연구)

  • Yeon, Sang-Ho
    • Journal of the Korean Association of Geographic Information Studies
    • /
    • v.3 no.3
    • /
    • pp.90-97
    • /
    • 2000
  • The study was aimed to extract the improvement measures for the problem on GIS application GIS for water supply and sewerage pipeline facility management in the Jechon city. For this, it performed of analysis of their working and modeling with other relational contents of the water and sewer facility management. As the results, the implementation of water and sewer facility management system by use of GIS has to applying development through relational analysis not only pipeline facility and leaking water protection, pipeline network analysis but also digital topography, drawing data, water user's information.

  • PDF

Characterization of Repairing PVC profile for Trenchless Sewer Pipeline (비굴착 하수관로용 PVC 프로파일 보수재 특성 평가)

  • Park, Joon-Ha;Jeon, Sang-Ryeol;Lee, Kwan-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.7
    • /
    • pp.4977-4983
    • /
    • 2015
  • The full depth excavation induces couple of technical and social problems like increase of construction cost and time for excavation and backfill, increase of public complains and delay of traffic, and so force. In order to overcome these problems, lots of laboratory tests were carried out for sewer pipeline of maintenance materials with trenchless methods. The testing materials are PVC strip and then the lab tests were followed by Korean Standard. We will treat the structure safety and pipe integrity of PVC profile more excellent than the profile have application to SPR. There is no side-effect to process and to satisfy the criteria of tensile strength, impact strength and softening temperature. The profile with resin adhesive showed no leakage of water at specific pressure.

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
    • /
    • v.20 no.3
    • /
    • pp.219-226
    • /
    • 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.

Correlation Analysis of Sewer Integrity and Ground Subsidence (하수관로 건전도와 도로함몰 발생 상관관계 분석)

  • Kim, Jinyoung;Kang, Jaemo;Choi, Changho;Park, Duhee
    • Journal of the Korean Geoenvironmental Society
    • /
    • v.18 no.6
    • /
    • pp.31-37
    • /
    • 2017
  • In recent years, the increasing trend of ground subsidence in major cities has caused social problems. Aged sewer pipeline as a main attribute for the subsidence is simply replaced and maintained according to a survey result with related to its buried period. However, other attributes and risk analysis for the subsidence have not been well studied yet. In this point, this study proposed various environmental and structural attributes with related to sewer pipelines and, then, a method of ground subsidence risk evaluation with a certain level of reliability. In order to find effective attributes to ground subsidence near to sewer, the nearest sewerage data were extracted at the location of subsidence in the City of Seoul, and a level of correlation was analyzed between subsidence and individual attribute. The effective weight factors for the proposed attributes was estimated through AHP analysis and its applicability was verified by comparing the actual subsidence data to the risk evaluation in the pilot study district of Seoul.

Design Flow Velocity Changes According to the Design Flow Determination Methods in the Sanitary Sewer (오수관 설계유량 산정법이 설계유속에 미치는 영향)

  • Hyun, In-hwan;Won, Seung-hyun;Kim, Hyung-jun;Lee, Che-in
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.19 no.6
    • /
    • pp.749-757
    • /
    • 2005
  • The present study analyzed actual cases of designed flow estimation method and designed flow rate of sewage pipe lines. In order to examine the effects of peak-hour demand factor estimation with given daily highest peak loading, we analyzed its effects on designed flow rate with changing the peak-hour demand factor from 2.0 to 10.0. The results of this study are as follows. When reviewing the recent designs, we found that 59.4% of pipe line with 250mm and 300mm diameter, which fall under minimum allowable pipeline did not meet the minimum velocity which is specified as 0.6m/sec in design standards. The pipe line that have minimal access population or have very low slope did not satisfy the minimum velocity. In estimating the designed sewage flow, the applied daily highest peak loading and hourly highest peaking loading were the load factor for the entire population of the planned area, and for the peak loading of the initial pipes connected to a very small population, we applied the same factor as that applied to the entire area and, as a result, the hourly highest flow was underestimated. Because, in case of the initial pipes, the method of applying the same peak loading to all subject areas is highly possible to produce underestimated design flow, when estimating the designed flow of the initial pipes connected to a small population need to adopt a rational flow factor according to the size of population. For this, it is considered to investigate and analyze raw data on daily and hourly variation of sewage flow.

Sediment Transport Characteristics in a Pressure Pipeline (압력 원형관로내 유사이송특성 연구)

  • Son, Kwang Ik;Kim, Hyun Jung
    • Journal of The Korean Society of Civil Engineers
    • /
    • v.31 no.3B
    • /
    • pp.205-209
    • /
    • 2011
  • The low carrying capacity caused by the deposition in a sewer line is one of the main reason of the urban flood. Therefore, an efficient maintenance and management of the storm water drainage system is very important to prevent urban flood. In this research, the sediment transport characteristics through a pressure pipeline were examined with laboratory experiments. Bed-forms in a pipeline, sediment rates, roughness due to sediments were examined. Experimental system consists of flow circulation system with a pump and a sediment feeder at the upstream of the pipeline. Sediments were supplied into a 60 mm-diameter and 8 m-long pipe. Maximum flow rate is $30m^3/hr$, and the sediment feeding rate range is 5 g/s~19 g/s. Governing parameters and estimation equation for sediment transport rate were developed. The mean velocity (U), coefficient of viscosity (${\mu}$), unit width bed load ($q_b$), mean diameter of particle ($d_{50}$), unit weight of sediment in water (${\gamma}^{\prime}_s$) were adopted as the most influencing factors of sediment transport patterns. The prediction equation for sediment transport rate were developed with two dimensionless terms. These two dimensionless terms showed a linear relationship with high correlation coefficient.