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Longitudinal rail restraint test method for rail transit

A test method and technology for rail transit, applied in the testing of mechanical components, the testing of machine/structural components, force/torque/work measuring instruments, etc., can solve the problems of inaccurate test results, difficult operation, and complicated test process.

Active Publication Date: 2021-05-04
苏州集成校准检测认证有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the test results obtained by the test method of longitudinal rail binding force are often not accurate enough, and the test process is very complicated and difficult to operate

Method used

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  • Longitudinal rail restraint test method for rail transit
  • Longitudinal rail restraint test method for rail transit
  • Longitudinal rail restraint test method for rail transit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Such as figure 2 As shown, for fasteners designed symmetrically with elastic strips, the sleeper 4 is first fixed by the rigid fixture 5, and then the rail 1 is fixed on the sleeper 4 by a single fastener 2, and then the load is applied longitudinally along the rail 1; for the spring strip staggered design Fix the sleeper 4 first, then fix the rail 1 on the sleeper 4 or other supporting structures through two fasteners 2 (the spacing between the fasteners is the standard spacing), and then apply the load along the longitudinal direction of the rail 1. A load-displacement test recording instrument 3 is connected between the rail 1 and the sleeper 4 .

[0025] During the loading process, record the displacement of the rail relative to the sleeper until the loading ends when the rail slides. Then the maximum load under the condition that the rail does not undergo inelastic deformation is obtained on the force-displacement diagram.

[0026] The load-displacement test rec...

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Abstract

The invention discloses a method for testing the longitudinal rail constraint force of rail traffic, comprising: loading the rail to a set loading force and maintaining it for a certain period of time, measuring the loading force and the longitudinal displacement of the rail relative to the sleeper from the beginning of loading; and then continuing Reload to the set loading force and keep it for a certain period of time, and perform multi-stage loading sequentially; when the rail slides in the fastener or the loading force exceeds or equals the set value, quickly reduce the load to 0, and continuously measure the rail displacement Change for a period of time, then repeat the above loading process several times, and draw the force-displacement curve of each loading cycle at a certain time interval between two loadings; calculate the longitudinal elastic displacement of the rail before sliding; determine the full load from each curve Based on the magnitude of the force F that produces elastic deformation, the F value obtained for the first time is discarded, and the remaining average value is calculated to obtain the longitudinal constraint force of the fastener on the rail. Accurate test results can be obtained, and the test process is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of testing fasteners of urban rail transit, in particular to a method for testing longitudinal rail binding force of rail transit. Background technique [0002] Tracks in rail transit need to be fixed using track fasteners, which are composed of several parts to ensure that the rail is fixed to the supporting structure and in the required position, while allowing any necessary vertical, transverse and longitudinal displacement. This component includes components that distribute the load on the rails to the supporting structure, and must prevent wear on the contact surface of the supporting structure and ensure electrical insulation from the supporting structure. Fasteners include simple fasteners and separate fasteners. Simple fasteners are fasteners that directly fix rails to supporting structures (sleepers or track bed slabs) (may or may not include iron backing plates). The separate fastener is a fasten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01L5/00
CPCG01L5/00G01M13/00
Inventor 周伦彬肖颖
Owner 苏州集成校准检测认证有限公司
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