• Title/Summary/Keyword: 궤도유지보수

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Performance Test of Wall to Wall Modular Structure Joint for Near-surface Transit (저심도 모듈식 구조체의 벽체간 연결 조인트 성능검증 실험)

  • Lee, Jong Soon;Kim, Hee Sung;Lee, Sung Hyung;Lee, Jun Kyoung
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.261-269
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    • 2015
  • To overcome the weaknesses of viaduct bridges and the non-economic efficiency of underground LRT, the study of near-surface railway systems is in progress. To apply a box structure to the low depth transit, a connection joint to precast modules are very important when applying precast modular structures to replace temporary structures. In this study, wall to wall connections were applied in diverse cases such as rebar connections, guiding structures that were used to fit the verticality of precast walls during construction, and non-reinforcement structures used only for waterstop. Experimental performance verification was carried out for the bending, shear and splitting of the wall to wall connection. Precision of construction joints between wall to wall was identified as a factor that influenced the structural performance of the precast wall. A structure that can serve as a guide during the vertical insertion of a wall is confirmed for the most suitable case, but it will be necessary to modify this structure for detailed cases.

Damage Status of Turnout System with Wooden Sleeper of Concrete Track on Urban Transit (도시철도 콘크리트궤도 목침목 분기기의 손상현황)

  • Choi, Jung-Youl;Han, Kyung-Sung;Bong, Jae-Gun;Jang, Cheol-Ju;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.4
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    • pp.379-385
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    • 2019
  • The purpose of this study is to investigate the damage status of wood sleepers on concrete track of urban transit at different locations and to analyze the causes of damages. In addition, the turnout maintenance history during the service period of about 24 years was analyzed in conjunction with the train passing tonnage and that was to compare the current repair history. The most frequent damage components were rail, tie plate, spike and wooden sleeper. And, the damage caused by the defect of the rail fastening system such as spike and tie plate according to the deformation of the wooden sleeper was analyzed as the main type of damage. As a result, the damage of track components of turnout system was on the increase because they are directly affected by the train passing tonnage. The supplementary points of the check sheet for current turnout maintenance were derived and the improvement proposal was suggested based on the research results.

Deformation Characteristics of Construction Joint of Paved Track on Earthwork Section using the Accelerated Track Test (궤도가속실험을 통한 포장궤도 토공구간 시공이음매부의 변형특성 연구)

  • Lee, Il-Wha;Jang, Seung-Yup;Kang, Yoon-Suk;Um, Ju-Hwan;Kim, Eun
    • Journal of the Korean Society for Railway
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    • v.13 no.5
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    • pp.521-527
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    • 2010
  • The Paved Track is applied to reduce maintenance cost of conventional line. The Paved Track could be used in all types of lines including earthwork, bridge, tunnel and turnout sections. In case of earthwork section, the construction joint is the most critical factor to track durability. The construction joint does not affect to the track structure directly, but the gap due to discontinuity of slabs may affect to the long-term serviceability. To evaluate this problem, the accelerated track test has been performed on the construction joint and the middle part to of the real scale Paved Track. The purpose of this test is that evaluate the vulnerability of construction joint section comparing the trends of settlement and earth pressure under repeated loads of construction joint with those of the middle slab part.

Assessing Distribution of Degree of Saturation for Track Transition Zone Using Soil Water Characteristic Curve (접속부 궤도 성토재료의 함수특성곡선을 이용한 포화도 분포 산정)

  • Choi, Chanyong;Lee, Jungmin;Kwon, Hyeok Min;Oh, Jeongho
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.2
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    • pp.515-524
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    • 2015
  • The number of occurrence of differential settlement and track irregularity at track transition zone recently comes to increase, which leads to frequent maintenance activities that have an impact on train operation. Such track transition zone damages are attributed to the change of mechanical properties of fill materials due to environmental factors such as rainfall and freeze, and thaw. Consequently, this study attempts to establish the soil water characteristic curve (SWCC) of fill materials, and conduct seepage analysis to assess the distribution of degree of saturation (DOS) for track transition zone in case of rainfall. The SWCC of fill materials was successfully obtained using filter paper test method. The results of seepage analysis revealed that rainfall intensity, the slope of backfill, backfill condition (fill or cut), and SWCC are significantly influential in controlling the distribution of DOS.

Comparison of Ride Comfort between Korean and European High Speed Railway by using Continuous Comfort Method (Continuous Comfort 방법을 이용한 국내외 고속철도 승차감 비교)

  • Choi, Il-Yoon;Um, Ju-Hwan;Lee, Jun Suk;Choi, Min-Ji;Lim, Jihoon
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.203-211
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    • 2015
  • Ride comfort of a vehicle can be utilized to maintain the track geometry and track irregularities because ride comfort of the rolling stock is affected by the characteristics of the vehicle and track. Ride comfort was evaluated according to the measured floor acceleration data of vehicles for a Korean high speed line as well as European high speed lines using Continuous comfort method which can be applied to track maintenance. The exceedance distribution of the ride comfort was quantitatively analyzed by the vehicle speed, the ride comfort of the Korean high speed line was compared with that of European high speed lines. It is shown that the ride comfort of Korean high speed line is better than that of European high speed lines, which indicates that the Korean track geometry and track irregularities are properly maintained.

Rail Grinding Criteria of Kyeong-Bu High-Speed Line for Effective Rail Maintenance (레일유지관리 효율화를 위한 경부 고속선 레일 연마 기준(안))

  • Kim, Man-Cheol;Kang, Tae-Ku
    • Journal of the Korean Society for Railway
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    • v.11 no.3
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    • pp.272-279
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    • 2008
  • The importance of maintenance of rail surface defects is increasing more according to the KTX operation. That is because during high speed operation of rolling stock, rail surface defects may cause shortened fatigue life of rail, acceleration of track degradation and reduced ride comfort. The paper was intended to study the establishment of rail grinding criteria of high-speed railway lines considering the KTX operation circumstances. For this, the specimens of UIC 60 rail on Kyeong-Bu high-speed operation lines were collected and they were tested for metallographic structure and measured for the hardness. As the factors affecting RCF causing the defects of rail surface, passing tonnage, running speed and track condition are considered.

Design of Wireless Power Transmission Antennas for Railway High-Speed Transponder System (철도교통용 고속 트랜스폰더 시스템 무선전력전송 안테나 설계)

  • Lee, Jae-Ho;Park, Sungsoo;Kim, Seong Jin;Ahn, IL Yeup
    • Journal of the Korean Society for Railway
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    • v.20 no.5
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    • pp.602-611
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    • 2017
  • In railway systems, the exchange of information between running trains and wayside equipment is a very important role in various applications such as position detection and train control. Track circuits have been used as the medium for information transmission between trains and wayside. However, track circuits must be installed continuously along the track on the ground, resulting in an inevitable increase in installation and maintenance costs. One of the most promising solutions to reduce these costs is to mix continuous information transmission (via wireless communication) and discontinuous information transmission (via transponder). In this study, we designed antennas of railway high-speed transponder readers and tags for wireless power transmission, which can be used to transmit information from ground to high-speed trains with a maximum speed of 400km/h. We also verified system performance through computational simulation and prototyping.

A Parametric Study on the Serviceability of Concrete Slab Track on Railway Bridges (철도교 콘크리트 슬래브궤도의 사용성에 관한 매개변수 영향 연구)

  • Park, Hong-Kee;Jang, Seung-Yup;Yang, Sin-Chu;Park, Yong-Gul
    • Journal of the Korean Society for Railway
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    • v.12 no.1
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    • pp.95-103
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    • 2009
  • Deformations of bridge deck ends on abutments and piers bring about severe problems in track geometry and require maintenance work. In case of concrete slab track, more severe deformation and additional forces on rail and rail supports can be induced by bridge deck deformation, which affect the serviceability of track structure since concrete slab track is much stiffer than ballasted track and the behavior of track structure is integrated with that of bridge deck. In this study, the design variables affecting the serviceability of track structure are selected and the influence level is estimated by a parametric study. As a result, it is found that continuous span is advantageous than simply supported span and the stiffness of bridge bearing and rail fastener as well as the distance between last rail support and bridge bearing are most important parameters.

Settlement of Embankment and Foundation for Concrete Track of Gyungbu High Speed Railroad (II) (경부고속철도 콘크리트궤도 토공 및 원지반 침하 (II))

  • Kim, Dae-Sang;Park, Seong-Yong;Shin, Min-Ho;Lee, Hyeon-Jung;Kim, Hyun-Ki
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.457-462
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    • 2007
  • An application of concrete track is being activity processed for the construction of Korean railroad. The concrete track has an advantage to decrease the maintenance fee, but is very difficult to control the settlement of ground and embankment consisting of substructure of concrete track below the allowable settlement level. This is the reason why the measurement and evaluation of both ground and embankment settlement before the installation of the concrete track is very important. One ground, a lower subgrade, and five surface settlements are measured to understand the settlement behavior of ground and embankment settlement. The period to measure settlements was more than 1 year after the completion of embankment. In this test site, ground settlement was over during the construction of embankment, but the embankment settlement are being continuously proceeded after the completion of embankment. The settlement velocity gradually is slowing down as time goes by. This paper also analysed the reasons of abrupt settlement increase and concluded that the rainfall was one of the important reason to increase settlement rate.

A Internal Signal Modeling for a Defect Diagnosis of Track Circuit on HSL (고속선 궤도회로 결함진단을 위한 내부 모델링)

  • Park, Ki-Bum;Lee, Tae-Hoon
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.779-785
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    • 2006
  • This paper introduces a result of internal signal modeling for a defect diagnosis of the UM-71C track circuit using on HSL. Actually, We fixed a sample area within operating section on HSL and performed the simulations for short circuit current that is reflected characteristic impedance and propagation factor. We compared the measuring data with the result of the simulation. These modeling can be used as the basic data for secure of the safety. Also, It need to make a criteria of analysis for the maintenance through comparison simulation data and inspection data.

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