• Title, Summary, Keyword: Concrete Slab Track

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Effect of Settlement Restoration Grouting between concrete track/Roadbed on the train service stability (콘크리트궤도 침하복원을 위한 궤도/노반 인터페이스부 그라우팅이 주행안정성에 미치는 영향)

  • Lee, Il-Wha;Lee, Sung-Jin;Lee, Tae-Guen;Kang, Tae-Ho
    • Proceedings of the KSR Conference
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    • pp.796-804
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    • 2008
  • Various design factors should be considered in order to apply the concrete slab track system on the soil/rock roadbed. One of the important factors is the settlement of roadbed. This settlement of concrete track should be supervised under the allowable settlement limit. If the settlement of roadbed under the concrete track exceed the allowable limit, the train serviceability will considerably come down and furthermore the fatal disaster may happen. Therefore, in this paper we introduced a digitalized grouting method as a settlement restoration method that can be suitably adopted to the concrete slab track. And we also evaluated the train service stability through the analysis of the track behavior according to the difference of the stiffness between the grouted part and the original roadbed.

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Characteristics of Vibration and Sound Radiated from Rails of Concrete Slab Tracks for Domestic High Speed Trains (국내 고속 철도 콘크리트 슬라브 궤도의 진동 및 방사 소음 해석)

  • Ryue, Jungsoo;Jang, Seungho
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.7
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    • pp.605-616
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    • 2013
  • An important source of noise from railways is rolling noise caused by wheel and rail vibrations induced by acoustic roughness at the wheel-rail contact. In the present paper, characteristics of rail vibration and radiated sound power from concrete slab tracks for domestic high speed train(KTX) is investigated by means of a numerical method. The waveguide finite element and boundary element are combined and applied for this analysis. The concrete slab track is modelled simply with a rail and rail pad regarding the concrete slab as a rigid ground. The wave types which contribute significantly to the rail vibration and radiated noise are identified in terms of the mobility and decay rates. In addition, the effect of the rail pad stiffness on the radiated power is examined for two different rail pad stiffnesses.

The effect of the poor infilling of the underpouring in precast slab track system on structural behavior (프리캐스트 슬래브 궤도 시스템의 충전층 충전불량이 궤도구물의 구조적 안전성에 미치는 영향)

  • Kim, Yoo-Bong;Kang, Young-Jong;Moon, Do-Young;An, Ki-Hong
    • Proceedings of the KSR Conference
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    • pp.256-260
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    • 2010
  • It has been proved that precast slab track has advantage of rapid construction speed and good quality compared to in-situ concrete slab track. A korean precast slab track, which is named as a K-PST, was developed and had been installed on the embankment and explored on the air. The developed track system consists of precast track panel and underpouring layer which is made of cement-asphalt mortar. Consequently, poor filling of underpouring layer directly could affect on the long-term performance of the track system. As a preliminary study, the effect of the poor infilling of the underpouring in precasst slab track system on structural behavior was investigated through FEM analysis.

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Behavior of Fastening system of HSR bridge ends deck on Slab Track installed Bridge (슬래브궤도가 부설된 고속철도 교량단부 체결장치의 거동)

  • Chun, Dae-Sung;Choi, Jung-Youl;An, Hea-Young;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • pp.1637-1646
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    • 2008
  • Deformations of bridge deck ends on abutment can cause extreme deformations on track. Especially, since slab track was fixed onto the bridge deck slab on concrete slab track installed bridges, deformations of bridge deck ends directly affect the slab track behavior, and thus these interactions can bring about the premature failure of rail fastenings or other deteriorations to lower the serviceability. In this study, a foreign standard to evaluate forces on track components caused by the track-bridge interactions and the behavior of bridge deck ends was investigated and for real scale bridges. It was found that rail support spring coefficients, as well as toe loads, support spacing were very important parameters.

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Development of Prefabricated Slab Panel for Asphalt Concrete Track (아스팔트 콘크리트 궤도용 사전제작형 슬래브 패널 개발)

  • Baek, In-Hyuk;Lee, Seong-Hyeok;Shin, Eung-Soo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.3
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    • pp.75-82
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    • 2019
  • Slab panels are very important to develop asphalt concrete (AC) track for minimizing the roadbed stress due to the train load and reducing the plastic deformation of infrared-sensitive AC. In this study, the slab panel for AC track was developed through the shape design and the indoor performance test and its structural integrity has been investigated through the finite element analysis under the flexural tensile stress and the design moment according to various static load combination by KRL-2012 standard train load model and KR-C code. In order to verify the suitability of the slab panel for AC track, static bending strength test and dynamic bending strength test were performed according to EN 13230-2. Results show that the slab panel for AC track satisfies all the performance standards required by European standards such as crack loads and crack extension.

PRCG Method to restore settled concrete track and structure (침하된 콘크리트궤도 및 구조물의 복원을 위한 PRCG공법)

  • Lee, Il-Wha;Lee, Sung-Jin;Lee, Su-Hyung;Kang, Tae-Ho;Shin, Hak-Yong
    • Proceedings of the KSR Conference
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    • pp.866-871
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    • 2010
  • Various design factors should be considered in order to apply the concrete slab track system on the soil/rock roadbed. One of the important factors is the settlement of roadbed. This settlement of concrete track should be supervised under the allowable settlement limit. If the settlement of roadbed under the concrete track exceed the allowable limit, the train serviceability will considerably come down and furthermore the fatal disaster may happen. Therefore, in this paper we introduced a PRCG(pressurized rapid-hardening cement grouting) method as a settlement restoration method that can be suitably adopted to the concrete slab track.

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A study on vibration characteristics of track components according to track type in HSL tunnel (고속선 터널내 궤도 형식에 따른 궤도 구성품의 진동 특성에 관한 연구)

  • Kim Man-Cheol;Jang Seung-Yup;Kang Yun-Suk;Han Jin-Seok;Han Sang-Cheol
    • Proceedings of the KSR Conference
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    • pp.498-503
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    • 2005
  • In this paper, an experimental study is carried out to analyze the vibration characteristics of components of the ballast track and the slab track layed in HSL tunnels. According to vibration level test of ballast tracks and concrete tracks on HSL, the vertical vibration level of rails on concrete tracks is 6.2dB more than that on ballast tracks, and especially on $50{\sim}80Hz$ frequency band, the difference is more than 6dB. The orther track components according to track type are appeared to be smaller on the slab track than on the ballast track. Regarding car body vibration, 80Hz component, which was not remarkable while running on open tracks, is considerably amplified in tunnels where concrete tracks are laid.

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Strength Analysis of Joints in Floating Slab Track (플로팅 슬래브궤도 연결부의 강도 분석)

  • Kwon, Ku-Sung;Chung, Won-Seok;Jang, Seung-Yup
    • Proceedings of the KSR Conference
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    • pp.375-381
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    • 2011
  • The passage of railway vehicles generates mechanical vibrations and noises. This problem can be mitigated by the 'floating slab track' that isolating from infrastructures by installing vibration isolator in the concrete slab track. In the previous researches, adjacent floating slab tracks are connected by dowel bar system. It has been reported that many dowel bars with less diameter show better load transfer efficiency (LTE) compared to small number of dowel bars with larger diameter under the condition of the same dowel area. In this study, dowel system is further considered as a concrete anchorage system and the design strength of the dowel system was evaluated based on ACI code 318-08 Appendix D. The design strength of dowel system is then verified against failure load test of floating slab system.

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Deformation and Stress Distribution of Discontinuous Precast Concrete Track Slab : I. Initial and Temperature Deformation (불연속 프리캐스트 콘크리트궤도 슬래브의 변형과 응력 분포 : I. 초기 및 온도 변형)

  • Lee, Dong Hoon;Kim, Ki Hyun;Jang, Seung Yup;Zi, Goangseup
    • Journal of the Korean Society for Railway
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    • v.20 no.5
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    • pp.625-636
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    • 2017
  • This study looked into the behavior of precast concrete track due to temperature variation and initial track deformation and examined the effect of initial deformation and deformation caused by temperature gradient on the stress distribution of slab under train load. In this paper, one of two papers in a series, a finite element analysis model for calculating deformation and stress of precast concrete track was proposed; the temperature distribution and displacements measured at the precast concrete track in the field were compared with the analytical results. The results show that the slab always curled up due to initial deformation; by comparing the measured displacements with the displacements calculated by taking measured temperatures at each depth as input, the effective built-in temperature (EBITD), the temperature difference between the top and bottom of the slab corresponding to the initial deformation, can be estimated. If EBITD is relevantly assumed, the calculated displacements correlate well with the measured ones.

Embedded Rail Track on the LRT(Tram) (레일 매립궤도의 특성과 노면철도에 적용 가능성에 관한 연구)

  • Lee Ki-Seung;Kim Sung-Chil;Beak Jin-Ki;Go Dong-Chun
    • Proceedings of the KSR Conference
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    • pp.394-399
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    • 2005
  • Embedded rail track can be described as a track structure that is completely covered within pavement. Rail supported continually on a concrete slab or concrete plinth. There are many kinds of types such as non-resilient track and resilient track, super resilient embedded track (floating slab). Embedded rail track is generally the standard for light rail transit routes because this track has many advantages such as reducing noise, maintenance cost and weight of track. In this paper, decision of track profile is restricted by the optimum levels of the flangeway and the gap between the rail head and the pavement surface of depressing tread zone. By result of this study, embedded rail track can reduce corrosion of rail, internal stress and rail deflection.

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