Method for monitoring crack defects in heavy load runway girder

Abstract

The invention discloses a method for monitoring crack defects in a heavy load runway girder. According to the method, electromagnetic ultrasonic surface wave probes that satisfy the sensitivity requirement are chosen and oppositely / parallelly arranged on the arc parts of the runway girder web in the column shoulder beam; the plug ends of the cables of the probes are connected to an electromagnetic ultrasonic data collecting instrument so as to perform onsite echo data collection; the change of echo is observed, when the structural echo of the arc surface of the runway girder web just disappears, the position of the acoustic beam angle of the probes is taken as the position for fixing the probes; after the probes are fixed, the waveform data of each probe is collected and observed at regular intervals and compared; when obviously abnormal echoes are found, a reliable method is adopted to confirm the property of the echoes, the extension situation of the abnormal echoes of crack defects is determined through regularly collected echo data so as to judge whether the runway girder is cracked or not. The defects of conventional detection modes are overcome by the provided method, through the prediction, the safety hazards can be found in time, and the great loss of accidents is avoided.

Description

technical field [0001] The invention relates to a method for monitoring crack defects of heavy-duty traveling girders. Background technique [0002] During the use of the heavy-duty crane girder, cracks may occur in the key stress parts of the structure. Severe crack propagation will lead to cracking of the girder, resulting in serious safety production accidents and huge economic losses. A Baosteel factory once shut down due to a cracking accident of the crane girder It has been nearly a month, so it is very necessary to grasp the crack defects of the driving frame. Non-destructive testing technology can accurately detect and quantify cracks in steel structures. Therefore, the surface defect detection method based on non-destructive testing-magnetic particle testing is widely used by users. Complicated preparation, especially for girders with reinforced deck structures such as figure 1 As shown, the cover plate 2 is connected to the web 1 by welding, and the web 1 between...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a monitoring method for crack defects of heavy-duty traveling girders, which solves the problems of inconvenient detection at high altitude after installation of the traveling girders, failure to detect the occurrence, expansion, and cracking of crack defects in key parts of the girders in time, Through monitoring, forecasting and predictive maintenance, timely discover potential safety hazards and avoid huge losses caused by accidents

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