오수압송관로 노후도 분석 및 개선 계획 : 사례연구

Abstract

The sewerage system is a very important social infrastructure that collects and transports generated sewage before it is disposed of. In the event of a problem, it is an important facility that directly affects the safety of citizens by acting as a cause of road subsidence as well as environmental problems, as well as inconvenience in residents' lives such as odor problems and sanitation problems. In the case of general sewage pipes, replacement or maintenance of aged pipes is actively carried out due to national support, but no separate maintenance standards or maintenance plans are established for sewage pipelines. In the case of sewage pressure pipelines, problems such as leakage of joints, damage to pipes, cracks, and corrosion are occurring due to the aging process over the period of burial, resulting in water pollution accidents and ground subsidence accidents. Therefore, it is necessary to analyze the overall problem of the wastewater pipeline and to prepare systematic management and maintenance standards for the pipeline based on it, so we will conduct a study on it. In this study, the government conducted a direct survey of the site of the pipe, an internal CCTV, and an investigation of soil corrosion to measure the deterioration of the sewage pressure tube, and analyzed problems of the pipe and causes of aging, such as the source of corrosion and the point of corrosion. In addition, the maintenance plans and considerations for the sewage pipeline were presented, and the results were as follows. (1) Based on the results of the on-site survey, it was confirmed that the corrosion effects of the operation of the sewage pressure pipeline were significant and that the aging of the obesity tube section was significantly higher than that of the on-site tube. Therefore, the profile plan should be established to prevent obesity tube sections from occurring when planning for the new transmission line.

(2) Although most of the tube types applied to sewage pressure pipelines were found to have used cast iron and steel pipes, unlike regular water pipes, the transfer fluid is highly corrosive, so it is necessary to review the application of glass fiber composite tubes and PE pressure tubes with high corrosion resistance.

(3) When implementing an existing project to refurbish an old pipeline, a maintenance plan for the existing pipeline shall be established after the new pipe is attached. In formulating an improvement plan, unnecessary maintenance plans for available sections shall be excluded by reflecting the maintenance plan only for those sections that require maintenance through on-site surveys, etc. of existing pipelines.