• Title/Summary/Keyword: Track maintenance

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Systematic Track Maintenance Methods (체계적인 궤도 유지관리방법)

  • Kang, Bo-Soon
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.1136-1142
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    • 2011
  • The approaches to systematic track maintenance methods set out in this study are only a small part of the many work activities on railway track. The application of modern maintenance technology enhances the value of modern railway operation and enables the track system to be kept in top condition.

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A Study on the Track Irregularity Index for the Estimation of Track Quality (궤도품질평가를 위한 궤도틀림 지표에 대한 연구)

  • 오지택;한승용
    • Proceedings of the KSR Conference
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    • 2000.11a
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    • pp.450-457
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    • 2000
  • This paper establishes a scheme to estimate track quality using standard deviation and deterioration rate of track irregularities. To provide index of quality, standard deviation and deterioration rate of track irregularities are analyed. As an index, standard deviation and deterioration rate were applied to decision of corrective maintenance and replacement maintenance, respectively. Further, this paper proposes a basic scheme for a modernization of mechanize track maintenance that using MTT(Multiple Tie Tamper) and Ballast Cleaner.

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An Analysis of the Track Irregularity Progress on the Various Track System in Urban Transit (도시철도 궤도시스템별 틀림진전에 대한 분석)

  • Ko, Jae-Hyun;Kim, Man-Cheol;Lee, Jee-Ha;Cho, Jun-Gon;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.311-319
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    • 2011
  • Track accompanies the process that track alignment by traffic loads is changed. A change of track alignment affects the running safety and riding comfort of train. This is called a track irregularity. The most important task in maintaining the track is to manage these track irregularity within quality parameters. Today, track maintenance of urban transit is enforcing immediate maintenance about section exceeding a safety standard by applying track recording data got through Integrated Measurement. This method is advantage of being easy of the maintenance assesment in case of the running safety, but is disadvantage of being difficult in case of the riding comfort of train. In this study, we propose track irregularity deviation of each track system depending on the time series and present about utilization plans of the Track Irregularity Progress Rate.

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Evaluation of Maintenance Quantity and Life Cycle Costs of Railway Track Considering Evolution of Rail Fatigue Damage and Ballast Settlement According to Track Quality Level (궤도 품질수준에 따른 레일 피로 손상과 자갈 침하 진전을 고려한 철도 궤도 보수량 및 수명주기비용 평가)

  • Jun-Hyuck Choi;Seung-Yup Jang;Seung-Won You;Do-Yeop Kim;Hyung-Jo Kim
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.28 no.4
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    • pp.37-47
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    • 2024
  • This study proposes a track maintenance quantity estimation model that considers evolution of rail fatigue damage and ballast settlement based on actual maintenance data from the Gyeongbu high-speed railway, and revises the existing life cycle cost (LCC) model for railway track. Using this model, maintenance quantities and life cycle costs based on different track quality levels are evaluated and discussed. According to the results, it is confirmed that applying the track maintenance quantity estimation model that accounts for rail fatigue damage and ballast settlement allows us to reasonably estimate maintenance costs close to the actual data. The track quality coefficient significantly influences both rail and ballast maintenance quantities, with ballast maintenance having a greater impact than rail maintenance. Additionally, as train speed increases, both rail and ballast maintenance quantities rise. Moreover, a higher track quality coefficient leads to a steeper increase in maintenance quantities with increasing train speed. Consequently, LCC also exhibits a faster growth rate over time with higher track quality coefficients and faster train speeds, resulting from an increased proportion of maintenance costs.

Economic Assesment for Track Ballast Structures based on Proper Maintenance Level (적정 유지관리수준에 기초한 궤도도상구조에 대한 경제성 검토)

  • Baek, Jae-Wook;Joo, Hwan-Joong;Song, Yoo-Seob;Park, Tae-Hyo
    • Journal of the Korean Society for Railway
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    • v.10 no.2 s.39
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    • pp.167-178
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    • 2007
  • In general, it is known that the concrete ballast track is possible to reduce a cost of maintenance activities cause of maintenance free by restrictive maintenance in application of track ballast structures. However, if deteriorations and fracture mechanism of a material are considered, proper maintenance activities and repairing are continually required. For the problems, we evaluated an economical efficiency of the gravel ballast and the concrete ballast on a proper level of maintenance activities. As the method based on history path is difficult to obtain sufficient reliabilities cause of an absence of real data for maintenance activities, we chose the delphi survey method by professional group, and we obtained the appropriate index and profiles for maintenance activities. As a result, we founded that effects for cost reduction can be expected by preventive maintenance management, and we proposed economical restrictions and life cycle cost for track ballast structures in a life cycle.

Requirement of Track Maintenance Plan Support System (궤도유지보수작업계획수립지원 시스템의 요구조건)

  • Lee Jee-Ha;Hwang Sung-Ho;Park Ok-Jung
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.886-891
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    • 2004
  • 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 made a survey of the state-of-art of decision-making support systems for track maintenance which were developed and used abroad and reviewed requirements of system and present the plan of develope decision-making support system for track maintenance appropriate to local condition.

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Construction Case of Maintenance-free Track System in Application of Elastic Rail Fastening System for Sharp Curved Section (급곡선용 레일탄성체결장치를 사용한 생력화궤도 시공 사례)

  • Kong Sun-Yong;Kim Sang-Jin
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.382-388
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    • 2005
  • SMSC(Seoul Metropolitan Subway Corporation) is substantially taking the core role of mass transit system in Seoul Metropolitan area. When it was built, the design had challenged to sharp curved tracks less than 250m radius considering the protection of buildings and cultural properties as well as the connection to ground roads. Such circumstances have required a certain extent of slack in track geometry and therefore led to the construction of ballasted track with wooden sleepers. However, the dynamic force from running on sharp curved track has caused the misalignment and abnormal failure of track geometry, and it has resulted in a frequent maintenance and repair works which require a lot of cost and manpower. In this paper, we present the construction case of maintenance-free track system by using of concrete sleeper and elastic rail fastening system to ensure the safety of both passengers and trains, and to contribute the effective maintenance for track facilities of SMSC.

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Study on the Appropriateness of Track Maintenance Works through the Evaluation of Trackbed Conditions (도상 및 노반상태 평가를 통한 궤도유지보수작업의 적정성 연구)

  • Kim, Dae-Sang;Kwon, Soon-Sup;Lee, Su-Hyung;Hwang, Seon-Keun;Park, Tae-Soon
    • Journal of the Korean Society for Railway
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    • v.11 no.3
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    • pp.334-341
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    • 2008
  • Ballast track needs maintenance works because it is supported by the compressible trackbed and subgrade layers. Maintenance works are essential to secure riding comfort and extend the life cycle of it. The necessities of maintenance works are determined from track irregularities measured by EM120. Track irregularities is the results of the track deformation. Therefore, it is natural to evaluate the cause of it. This paper focuses on the points the track irregularities come from the trackbed and the subgrade. Nondestructive techniques, such as Ground Penetrating Radar (GPR) and Portable Falling Weight Deflectometer (PFWD) are applied to evaluate the trackbed conditions, ballast layer thickness and vertical track stiffness, in the test section 500m long of Gyungbu line. The trackbed investigation results are compared with the track irregularities measured by EM120 and maintenance works. Conclusively, it was found that some maintenance works were unnecessary on the test section.

Application of Geotextile to ensure the Motor Pouring Ability for Paved Track (포장궤도 모르터 충진성능 확보를 위한 토목섬유의 적용)

  • Lee Ho-Ryong;Park Jong-Kyan;Hwang Seon-Keun;Lee Il-Wha
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.836-841
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    • 2005
  • As gravel roadbed is gradually turn down by repetitive loading of train, lasting work for maintenance and management of track is necessary to reduce the settlement of roadbed and the deterioration of track. Despite of above weak point, gravel roadbed has become a basic structure of roadbed at the present time. But request for new structure of roadbed is recently presented to settle an increased transportation capacity of track, and to solve a shortage of the labor to handle maintenance work of track. Therefore, we begin to research about maintenance-free roadbed like paved track from two years ago. In this study, a series of tests were performed to clarify the characteristics of strength and permeability of concrete specimen, which is the upper part of paved track injected by cement mortar, by type of geotextile and finally to give a basic data for application of geotextile to the lower part of paved track.

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The Standardization of Damage Types of Track Components on High Speed Railway (고속철도 궤도구성품의 손상유형 표준화)

  • Oh, Seoung-Jae;Sung, Deok-Yong;Kim, Jun-Hyung;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.1056-1064
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    • 2008
  • It is estimated that the running of locally-developed next generation High Speed Trains with maximum speed of 400km/h will help to deteriorate track components. It was presented rail defect coding system in UIC 712R includes the definitions of damage types of rail, maintenance procedures, and etc to detect and maintain. It is necessary to make a track maintenance manual determining track maintenance periods using the standardization of damage types of track components such as: sleeper, fastener, elastic pad. In this paper, the damage types of high speed track components are investigated by referring domestic and foreign literatures. And then the damage types of rail given in UIC 712R is reclassified more particularly and classified damage types of track components using internal high speed railway. In conclusion, this paper suggests standardization for damage types of track components on internal high speed railway.

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