Method for managing longitudinal sleepers

The method employs strain gauges and low-pass filtering to accurately assess sleeper support at rail joints, addressing inaccuracies in existing methods and enabling effective maintenance decisions.

JP2026031174APending Publication Date: 2026-02-24RAILWAY TECHNICAL RESEARCH INSTITUTE
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Patent Information

Application Number
JP2024134538
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-08-09
Publication Date
2026-02-24

AI Technical Summary

Technical Problem

Existing methods for evaluating the support condition of vertical sleepers at rail joints in railway tracks are inaccurate due to the impact of rail joints, leading to potential misjudgment of uplift in sleepers, and there is a need for a method to appropriately assess the support state and determine maintenance work.

Method used

A method using strain gauges to measure the strain of longitudinal beams, calculating bending moments, and applying a low-pass filter to exclude impact forces, allowing for accurate evaluation of sleeper support conditions at rail joints by determining the ratio of positive to negative bending moments.

Benefits of technology

Enables precise evaluation of sleeper support conditions at rail joints, facilitating appropriate maintenance decisions by accurately distinguishing between supported and unsupported states, thereby preventing damage and ensuring timely maintenance.

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Abstract

To provide a method for managing longitudinal sleepers capable of appropriately performing evaluation of a support state of the longitudinal sleepers in a rail joint and determination of maintenance work contents.SOLUTION: The strain of the vertical beam when the railway vehicle travels on the rail is measured by the strain gauge mounted on the upper surface of the vertical beam. The bending moment acting on the vertical beam is calculated from the relationship between the strain measured by the strain gauge and the bending moment acting on the vertical beam. A ratio between the magnitude of the positive bending moment corresponding to the downward deflection of the vertical beam and the magnitude of the negative bending moment corresponding to the upward deflection of the vertical beam is calculated. When the ratio is equal to or greater than a first predetermined value, it is evaluated that the vertical beam is in a state of floating from the track bed. This ratio is calculated by processing the time-series waveform of the measured strain or the time-series waveform of the calculated bending moment with a low-pass filter.SELECTED DRAWING: Figure 4
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Citation Information

Patent Citations

  • Rail track support state estimation method, and program and system thereof

    JP2020016094A

  • Vertical sleeper management method

    JP2023056640A