Nouns for rail inspection

- Jul 18, 2018 -

Rail inspection vehicle is the detection of track geometry and plays a key role in daily maintenance.

(1) noun interpretation

1. Rail Gauge

The shortest distance in the 16mm range of the two rail head inside the rail top is called gauge. There are many kinds of rail gauges in different countries in the world. In China, it is customary to call 1435mm standard gauge, larger than 1435mm for wide rail and less than 1435mm for narrow gauge.

2. Rail direction irregularity (left and right track)

It refers to the longitudinal irregularity of the track along the track, that is, the straight line is not straight and the curve is not round. It is mainly manifested as rail rigid bending and rail accumulation residual deformation.

3. The high and low irregularity (high and low)

After a period of train operation, due to the state of subgrade and the solid degree of tamping, the tightness of the fastener, the decadent of the sleepers and the wear of the rail, the uneven subsidence will result in the uneven height of the rail surface. The longitudinal irregularities of the track are called high and low or high and low irregularities.


It refers to the line disease that occurs when the horizontal difference between the two strands alternately within the specified distance exceeds the specified value.

5, level

The horizontal state of the left and right two rail surfaces. The rail top surface should be kept at the same level in the straight line section, and the extra height of the external rail should be satisfied in the curve section.

6, the vibration acceleration of the body

The lateral vibration acceleration (water addition) and vertical vibration acceleration (vertical acceleration) are the dynamic responses of the locomotive to the geometric deviation of the track and the measurement of the stability of the locomotives and rolling stock.

7. Standard of comfort

The standard of comfort is only an assessment target for the section above 200km. In this standard, it examines the height and track of the 70m, and examines the rate of change of the gauge, the rate of curvature change and the rate of change.

The so-called 70m height and track irregularity refers to the detection in the wavelength 1.5m 70m range. The main difference between the original height and the track direction is the difference in the detection wavelength. The detection wavelength in the original standard is 1.5m 42m. Besides the wavelength, the other meaning is completely the same as the original meaning. For the understanding of the rate of gauge change, the rate of change of curvature and the three rate of increasing the rate of change, we can fully understand these concepts from the literal point of view, which is mainly an assessment index of the change of gauge, curvature and lateral vibration acceleration in a unit time.

(two) the cause of exceeding the limit

1, high and low: excessive road junction, joint low button, big rail joint, rail collapse, falling block, bridge head, road crossing, culvert and other roadbed hard and soft joints.

2, gauge: the rail distance is beyond the limit, the track distance is not smooth, the direction is bad, the fertilizer edge, hard bend, uneven side grinding, the wooden pillow failure, the road nail floating, the rail brace or the rail distance pull rod failure, the fastener climbing off, the rail distance baffle wear, the turnout basic rail cutting, the fastener buckle pressure, the elastic squeeze opening, the gauge width widening setting difference and so on.

3, rail direction: straight line is not straight, the curve is not round, the gauge is not smooth, hard bending, rail uneven wear, wood pillow failure, continuous nail floating, fastener button pressure is insufficient, uneven elastic extrusion and so on.

4, level: one rail elevation, two rail sinks are inconsistent, empty crane, dark pit, super high slope adverse. In the vicinity of the straight point, the straight line and the curve boundary are unknown because of the bad vector of the curve.

5, triangular pit: empty crane, dark pit, super high slope adverse, anti prying level.

6, vertical acceleration: high and low irregularity, wave wear, joint wrong teeth, low joint, large rail seam, block, saddle mill, slab, pulp, bridge (line tunnel, line tunnel, line culvert, new and old subgrade), multiple diseases superposition, disease change rate, disease distribution, etc.

7, the lateral acceleration: the rail direction is not smooth, the normal vector is bad, the turnout area is small, the track distance is not smooth, the rail alternate uneven wear, the reverse position complex irregularity (such as the level, the direction), a variety of disease superposition, disease change rate, disease distribution, under ultrahigh, oversuper high.

8. The rate of Gauge Change: poor track distance.

9, curvature change rate: the curve vector is bad and alternating.

10, the rate of change is: the positive vector is bad, the size changes alternatively.

Jinzhou Tiegong Railway Maintenance Machinery Co., Ltd