• Title/Summary/Keyword: Track maintenance

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Investigation of Recent Maintenance and Management in Existing Railway Bridges for Development of Urban Maglev Track Structures Inspection Manual (도시형 자기부상철도 토목구조물 유지관리 지침 작성을 위한 국내 철도교 유지관리 현황 분석)

  • Lee, Gi-Yeol;Yang, Tae-Sock;Chung, Won-Yong
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.107-111
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    • 2008
  • This paper presented a literature review and investigation analysis results of total 19 present guide book and provisions of maintenance and management system in existing railway bridges to development of urban maglev track structures inspection manual. This research carried out a cooperated research subject 3-1, development a design code and maintenance and management inspection manual for urban maglev track structures, of the Center for Urban Maglev Program. Three types of track structures were includes as a major analytical parameter together with railroad, high speed railroad, subway and light rail transit. Bridges were analyzed a general rules, investigation, evaluation, repair and strengthen method as a key aspect. And rail were analyzed examination and maintenance also. This analysis results show that the track structures evaluation are based on the test and examination results, and repaired or strengthened consideration of deterioration, track irregularity and materials according to provision requirements.

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Evaluation of the Railroad Track Life Cycle Based on the Metro Rail Wear Data Regression Analysis (지하철 마모 데이터 회귀분석을 통한 궤도 수명 평가)

  • Jeong, Min-Chul;Kim, Jung-Hoon;Lee, Jee-Ha;Kang, Yun-Suk;Kong, Jung-Sik
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.4
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    • pp.86-93
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    • 2010
  • The wear of railway track affects loss of rough ride, noise or vibration of train and traveling safety. Moreover as the track is worn away, this promotes destruction of structural mechanism of rail track which can bring about increasing of rail track maintenance cost drastically. For this reason, it is very important and interested research subject to design railway track structure and to analyse train movement mechanism based on systematic analysis of the reasons causing rail wear possible in real field. In this research, for the efficient maintenance, Life Cycle Performance of rail track and maintenance characteristics are computed considering some track components such as track type, contracting type, sleeper type and roadbed type. Time - Wear probabilistic distribution relationship as well as multiple regression analysis based on time, curvature and wear data are computed to predict the service life remainder of railway track and to be adapted to safety assessment.

A Study on Track Maintenance Scheduling of High-Speed Railway (고속철도 궤도유지보수 일정계획에 관한 연구)

  • Kim, Ki-Dong;Lee, Joo-Hwan
    • Journal of Industrial Technology
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    • v.28 no.A
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    • pp.43-49
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    • 2008
  • The track of high-speed railway get deteriorated according as using it. In that case, the maintenance jobs are needed for improvement of track quality. A scheduling problem for the track maintenance of high-speed railway is to determine the jobs should be performed daily. In the problem, the set of jobs for maintenance is given. Each job has it's parameters such as due date, emergency level, and processing time. In addition, jobs can be worked during a certain fixed time when the train doesn't move. In this study, we developed a mathematical model of the scheduling problem for the maintenance of high-speed railway and solved the problem using the ILOG CPLEX library.

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Correlation Analysis Between Crack and TQI in RC Slab Track (철도콘크리트 슬래브 궤도상의 균열과 TQI 상관성 분석)

  • Kwon, Sae Kon;Park, Mi Yun;Kim, Doo Kie;Park, Jae Hak
    • Journal of Korean Society of Disaster and Security
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    • v.5 no.2
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    • pp.71-79
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    • 2012
  • Recently, in the total railroad construction field, the concrete slab track is adapted, not ballast track. Because the ballast track have the characteristics doing the ongoing maintenance and difficult to handle increasing maintenance costs, eventually the concrete slab track is selected as an alternative. However, owing to the hydration heat reactions and temperature affected shrinkage cracks related to concrete itself, a variety of studies to solve maintenance problems related to concrete slab track are underway. This study analysed characteristics of TQI values evaluating the track irregularity, searched the relationship between crack progress and TQI, and then evaluated of the correlation between the two values. Through this method, there is a need to complete the problems of the current method, only TQI is the main decision making tool in track maintenance, and also the need for the development of evaluation index considering the crack.

A study on the Longitudinal Force Variation of CWR according to the Condition of Track Maintenance (궤도보수 작업 조건별 장대레일 축력변화에 관한 연구)

  • Won, Yong-Hoan;Kim, Kwan-Hyung;Kwon, Soon-Jung;Lee, Seung-Youl
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.99-105
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    • 2009
  • This research presents the method to decide proper locations for destressing of CWR using a non-destructive equipments to measure the longitudinal force(installation temperature) in CWR. The effect and necessity of destressing were analyzed by estimating changes of longitudinal force. The installation temperature was measured to find changes of longitudinal force in high speed and conventional lines before and after destressing or track maintenance at the locations where destressing was planed or where change of longitudinal force was expected during track maintenance. Past destressing was carried out within qualitative decision criteria. This research proposes the quantitative criteria to decide the priority order of the destressing locations reasonably by considering the difference of air temperature and stress free temperature during the track maintenances, the grade of ballast resistance force recovering and the length of destressing, etc.

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Optimal Vertical Stiffness of Fastener of Concrete Track in High-Speed Railway (고속철도 콘크리트궤도 체결구 최적 수직강성)

  • Yang, Sin-Chu
    • Journal of the Korean Society for Railway
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    • v.18 no.1
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    • pp.43-52
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    • 2015
  • In this study, to minimize both the costs associated with track maintenance and the energy consumption for train operation, a numerical method that evaluates the optimal vertical stiffness of a fastener for concrete track is presented. A progress model of the track damage is established in order to calculate the concrete track maintenance cost according to the fastener stiffness. Also, the quantitative relationship between the progress of the track damage and the maintenance of the concrete track is derived. The wheel load is more exactly evaluated by using the advanced vehicle-track interaction model, which can precisely consider the behaviors of the track components. An optimal range for the stiffness of the fastener, a range that is applicable to the design of concrete track for domestic high speed lines, is proposed.

Decision-making support system for track maintenance (궤도 유지관리 의사결정 지원 시스템 개발)

  • Lee, Jee-Ha;Rim, Nam-Hyoung;Yang, Shin-Chu
    • Proceedings of the KSR Conference
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    • 2003.10b
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    • pp.454-459
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    • 2003
  • The process of determining whether, when, where and how to intervene, of deciding on optimum allocation of resources and minimizing the cost is a very complex problem: different track sections tend to behave differently under the effects of loading; decision-making processes for maintenance work are closely interrelated technically and economically; decision-making for maintenance plans is based on a large quantity of technical and economic information, extensive knowledge and above all experience. For that reason, It is considered very important to develope objective and computer-aided decision-making support system for track maintenance plan. On this paper, we reviewed ECOTRACK system and present the plan of develope decision-making support system for track maintenance appropriate to local condition.

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Analysis of Life Cycle Costs of Railway Track : A Case Study for Ballasted and Concrete Track for High-Speed Railway (철도 궤도의 수명주기비용 분석 : 고속철도 자갈궤도와 콘크리트궤도 사례 연구)

  • Jang, Seung Yup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.2
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    • pp.110-121
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    • 2016
  • In the decision-making, such as selection of structure, construction method, or time and scheme of maintenance, the evaluation of life-cycle cost(LCC) is of great importance. The maintenance cost occupy a large portion of the LCC of the railway track as well as the initial construction cost. Futhermore, the proportion of the maintenance cost is much higher in the ballasted track. Thus, the importance of the LCC evaluation is higher than in any other engineering structures. In this study, a LCC model that can consider various design parameters such as the type of track structure, annual traffic volume, axle load, train speed, and proportion of curve sections and engineering structures has been developed. Fundamental data for calculating costs also have been presented. Based on the model and data proposed, the trends in the variation of LCC according to the design parameters were examined and the most important design parameters in the LCC analysis of railway track were investigated. The results show that the proportion of renewal and operational costs is much higher in the ballasted track than in the concrete track, and the annual traffic volume and ballast taming period are most significant factors on the LCC of the ballasted track. On the contrary, it is revealed that the proportion of the initial construction costs in the concrete track is much higher, and the LCC of the concrete track is less sensitive to the traffic volume, train speed, and axle load.

Optimal Design of Cement Mortar Pouring type Paved Track (시멘트모르터 충진형 포장제도의 최적 설계)

  • Lee, Il-Wha
    • Journal of the Korean Society for Railway
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    • v.9 no.2 s.33
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    • pp.222-229
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    • 2006
  • Recently, the development of the paved track is required as a low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The important factors of paved track are stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the prepacked concrete technique. The most important thing to design the paved track is to optimize the track structure considering various conditions. Because construction environment is very limited, cost is expensive and it has very complicated behavior. On this paper, structural characteristics of the paved track are investigated using the 3D finite element analysis to verify the optimized structure of the CMP track.

Prediction of Bending Fatigue Life to Welding Parts of Rail on Slab Track (슬래브궤도상의 레일 용접부 피로수명 예측)

  • 김만철;김진성;한상철
    • Journal of the Korean Society for Railway
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    • v.4 no.4
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    • pp.138-146
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    • 2001
  • For the purpose of the effective maintenance of surface irregularities of rail, this paper investigates the rail service life to a bending fatigue failure of welding parts of rail on the slab track by the structures laboratory testing to derive S-N curves, a GTDAP(General Track Dynamic Analysis Program) to calculate the stresses and a modified Miner's rule to predict a fatigue life. The useful guides for maintenance of rail welded parts on the slab track are proposed in terms of a grinding period and the depth of rail surface irregularities. This study also proposed the guides for maintenance of rail welded part on the ballast track. The effects of fatigue service lives are compared one another.

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