The structure and method of impact elastic wave detection for the empty state of ballastless track base of high-speed railway

Abstract

The invention discloses a structure for detecting a disengaging status of a ballast-less track base of a high speed railway by impact elastic waves, wherein one side of the top surface of the ballast-less track base is uniformly provided with multiple elastic wave detection points along a route direction, and the side of each elastic wave detection point is respectively provided with an impact elastic wave trigger point; the structure further comprises a computer, a data acquisition unit, an acceleration sensor for detecting the elastic waves on each elastic wave detection point, and an impact elastic wave trigger device for triggering the impact elastic waves on each impact elastic wave trigger point; the signal output end of the acceleration sensor is connected with the signal input end of the computer through the data acquisition unit. The structure can overcome the disadvantage that the resolution ratio of the geological radar cannot meet the millimeter disengaging requirement, and the disengaging status of the ballast-less track base can be precisely and effectively evaluated by analyzing the spectrum characteristics of the impact elastic waves.

Description

technical field [0001] The invention relates to the technical field of subgrade detection, in particular to a structure and method for detecting the void state of a ballastless track base of a high-speed railway by shock elastic waves. Background technique [0002] Due to the short time for the high-speed railway to be officially put into operation, the research on ballastless track disease detection methods is relatively lagging behind. At present, only Beijing Jiaotong University and China Railway Ruiwei Testing Company have used geological radar to carry out ballastless track subgrade disease detection. Because the subgrade of ballastless track is usually closed with concrete as a whole, the gap between the base and the subgrade is very small, some may be only millimeters, and the detection resolution of ground radar is low, which cannot meet the requirements of finding out the millimeter-level void state of the ballastless track base ; In addition, the concrete base cont...

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Problems solved by technology

Because the ballastless track subgrade is usually closed with concrete as a whole, the gap between the base and the foundation bed is very small, some may be only millimeters, and the detection resolution of the ground radar is low, which cannot meet the requirements of finding out the millimeter-level void state of the ballastless track base ; In addition, the concrete base contains steel bars, which shield the radar electromagnetic wave signal and affect the detection accuracy of the empty state of the base

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