CN-121992688-A - Transverse restraint device for steel rail

Abstract

The invention belongs to the technical field of urban rail transit engineering earthquake resistance and rail constraint, and relates to a steel rail transverse constraint device which comprises two groups of steel rail fasteners and two groups of limiting components, wherein each limiting component comprises a mounting seat, an abutting bulge, a thermal bimetal, a disc-shaped force transmission piece, an elastic piece and a limiting rod, and the elastic piece is sleeved on the outer side of the limiting rod. The mounting groove has been seted up to the one end of mount pad, and in elastic component, disc biography power spare, hot bimetal and the bellied installation groove of locating in proper order of supporting, the elastic component supports with the diapire of mounting groove, and the one end and the diapire of mounting groove of gag lever post are connected. The thermal bimetal comprises a first metal layer and a second metal layer which are sequentially arranged, and the thermal expansion coefficient of the first metal layer is larger than that of the second metal layer. The abutting bulge is arranged on one side of the first metal layer, which is far away from the second metal layer, and the abutting bulge is used for abutting against the side face of the steel rail. The steel rail transverse restraint device can prevent double failure of exceeding of transverse displacement and longitudinal stress of the steel rail.

Inventors

• QIAO HONG
• XUE HAO
• XU MAN
• RUAN LIANGFENG

Assignees

• 北京建筑大学
• 中冶建筑研究总院有限公司
• 中铁第五勘察设计院集团有限公司

Dates

Publication Date

20260508

Application Date

20260402

Claims (10)

1. 1. The transverse steel rail restraining device comprises two groups of steel rail fasteners which are arranged on two sides of a steel rail, wherein each steel rail fastener comprises an elastic strip and a connecting bolt, and is characterized by further comprising two groups of limiting components, each group of limiting components is correspondingly arranged between the bolt head of the connecting bolt and the elastic strip, each limiting component comprises a mounting seat, an abutting bulge, a thermal bimetal, a disc-shaped force transmission piece, an elastic piece and a limiting rod, the elastic piece is sleeved on the outer side of each limiting rod, one end of each mounting seat is provided with a mounting groove, the elastic piece, the disc-shaped force transmission piece, the thermal bimetal and the abutting bulge are sequentially arranged in each mounting groove, each elastic piece abuts against the bottom wall of each mounting groove, and one end of each limiting rod is connected with the bottom wall of each mounting groove; The thermal bimetal comprises a first metal layer and a second metal layer which are sequentially arranged, wherein the thermal expansion coefficient of the first metal layer is larger than that of the second metal layer, the abutting bulge is arranged on one side, far away from the second metal layer, of the first metal layer, and the abutting bulge is used for abutting against the side face of the steel rail.
2. 2. The lateral rail restraining apparatus according to claim 1, wherein the elastic member is a plurality of belleville springs arranged in order in an axial direction of the mounting groove.
3. 3. The transverse rail restraining device according to claim 2, wherein the middle part of the belleville spring is provided with a mounting through hole for the limiting rod to pass through, and the ratio of the aperture of the mounting through hole to the diameter of the limiting rod is 1.1-1.2.
4. 4. A rail transverse restraining means according to claim 2 wherein the inner wall of the mounting recess is provided with a chrome coating.
5. 5. A rail transverse restraint according to claim 2, wherein the number of belleville springs is 2 to 8.
6. 6. A rail transverse restraint according to claim 1, characterized in that the first metal layer is made of carbon steel or H62 brass and the second metal layer is made of Invar steel or 4J36 steel.
7. 7. The transverse rail restraining device according to claim 1, wherein the abutting projection comprises two abutting columns arranged at intervals, one end of each abutting column is connected with one side, away from the second metal layer, of the first metal layer, the other end of each abutting column is used for abutting against the side face of the rail, and one end, abutting against the side face of the rail, of each abutting column is hemispherical.
8. 8. The transverse rail constraining apparatus of claim 1, wherein the first and second metal layers are of equal thickness and are fixedly connected.
9. 9. A rail transverse restraint according to claim 1, wherein the mounting base is made of Q355 steel or Q235B steel.
10. 10. A rail transverse restraining apparatus according to claim 1 wherein the end of the mounting base remote from the opening of the mounting recess is provided with a mounting hole for the passage of the connecting bolt.

Description

Transverse restraint device for steel rail Technical Field The invention belongs to the technical field of urban rail transit engineering earthquake resistance and rail constraint, and relates to a steel rail transverse constraint device. Background Along with the networked development of urban rail transit, a tramcar becomes a key traffic mode for connecting a urban core area and a suburban area due to the advantages of low noise and high adaptability. In order to adapt to complex urban terrains such as old urban areas and the periphery of river channels, small-radius curve bridges with the radius of 25m to 500m are increasingly widely applied. In order to limit the lateral displacement of the rails of a tramcar, lateral restraint of the rails is often achieved by lateral restraint devices. The existing transverse restraint device is usually two rail fasteners arranged on two transverse sides of a rail, and the rail fasteners mainly comprise elastic strips and bolts, wherein the elastic strips are arc steel strips with certain elasticity. During installation, the concave surface of the elastic strip faces downwards, one end of the elastic strip is pressed at the rail bottom of the steel rail through the gauge baffle, the other end of the elastic strip is pressed on the rail bearing table of the bridge through the cushion block, the bolt penetrates through the middle part of the elastic strip and is fixed on the rail bearing table, and the transverse constraint on the steel rail is realized through downward pressure of the elastic strip on the steel rail. Research shows that the larger the curvature of the steel rail is, the larger the transverse force influenced by the centrifugal force is, and the transverse limit requirement on the steel rail on the small-radius curve bridge is difficult to meet by the existing steel rail fastener, so that the transverse displacement of the steel rail far exceeds the standard displacement value. Moreover, the transverse displacement of the steel rail can be converted into longitudinal tensile/compressive stress of the steel rail through the poisson effect of the materials and the longitudinal and transverse coupling characteristics of the structure, so that the fatigue cracking risk of the rail is induced. Further, under the dual actions of temperature difference and earthquake, the lateral component force of the temperature force and the lateral force of the earthquake can further increase the lateral displacement of the steel rail, and the dual failure of exceeding the standard of the lateral displacement and exceeding the limit of the longitudinal stress of the steel rail is more easily caused. Disclosure of Invention The invention aims to provide a steel rail transverse restraint device, which solves the technical problem that the existing steel rail transverse restraint device is easy to cause double failure of exceeding of transverse displacement and exceeding of stress of a steel rail. In order to achieve the above purpose, the specific technical scheme of the steel rail transverse restraint device provided by the invention is as follows: The steel rail transverse restraint device comprises two groups of steel rail fasteners and two groups of limit components, wherein the two groups of steel rail fasteners and the two groups of limit components are arranged on two sides of a steel rail, each steel rail fastener comprises an elastic strip and a connecting bolt, each group of limit component is correspondingly arranged between a bolt head of the connecting bolt and the elastic strip, each limit component comprises a mounting seat, an abutting bulge, a thermal bimetal, a disc-shaped force transfer piece, an elastic piece and a limit rod, the elastic piece is sleeved on the outer side of the limit rod, one end of each mounting seat is provided with a mounting groove, the elastic piece, the disc-shaped force transfer piece, the thermal bimetal and the abutting bulge are sequentially arranged in the mounting groove, the elastic piece abuts against the bottom wall of the mounting groove, and one end of each limit rod is connected with the bottom wall of the mounting groove; The thermal bimetal comprises a first metal layer and a second metal layer which are sequentially arranged, wherein the thermal expansion coefficient of the first metal layer is larger than that of the second metal layer, the abutting bulge is arranged on one side, far away from the second metal layer, of the first metal layer, and the abutting bulge is used for abutting against the side face of the steel rail. Further, the elastic piece is a plurality of belleville springs which are sequentially arranged along the axial direction of the mounting groove. Further, the middle part of the belleville spring is provided with a mounting through hole for the limiting rod to pass through, and the ratio of the aperture of the mounting through hole to the diameter of the limiting rod is 1.1-1.2. Further, the in