Method for monitoring maximum deformation in lifting process of large structure

Abstract

The invention discloses a method for monitoring the maximum deformation in the lifting process of a large structure, which comprises the following steps of: performing laser irradiation on the surfaceof the structure to form laser speckles, and performing shooting by using a CCD (Charge Coupled Device) camera according to a certain time interval when the structure is not lifted and in the liftingprocess, processing the shot grey-scale map by an image acquisition card to obtain pixel point coordinates of speckles, clustering coordinate data by adopting a K-means module in Python, selecting aclustering center point from each speckle as an approximate substitute of the speckle position, calculating offsets of the corresponding pixel points in matlab to obtain the maximum offset, drawing abroken line graph of which the offset changes along with time; and in the lifting process, if the broken line graph has a special situation, immediately stopping the machine for overhauling. The method can improve the measurement precision of the surface deformation of the structure, simplifies the setting process of the measurement device, reduces the use cost, and greatly improves the measurement efficiency.

Description

technical field [0001] The invention relates to a method for monitoring the amount of deformation of a large-scale structure, in particular to a method for monitoring the maximum amount of deformation in the process of lifting a large-scale structure. Background technique [0002] When installing and transporting a large structure, it needs to be hoisted through the lifting point on the structure or lifted by the fulcrum on the structure. The instability during the lifting or lifting process will cause deformation of the large structure. When the large structure When the deformation exceeds the critical value, it may lead to engineering accidents. [0003] Large-scale structures have a large span, and the allowable deformation during the lifting process is small. It is difficult to accurately measure the structural deformation of large-scale structures during the lifting process using traditional displacement sensors and angle inclination sensors. A more accurate measuremen...

AI Technical Summary

Problems solved by technology

[0002] When installing and transporting a large structure, it needs to be hoisted through the lifting point on the structure or lifted by the fulcrum on the structure. The instability during the lifting or lifting process will cause deformation of the large structure. When the large structure When the deformation exceeds the critical value, it may lead to engineering accidents

[0003] Large-scale structures have large spans, and the allowable deformation during the lifting process is small. It is difficult to accurately measure the structural deformation of large-scale structures during the lifting process using traditional displacement sensors and angle inclination sensors.

A more accurate measurement method is to use a static level to measure the surface to be measured, but the installation process of this method is complicated, and it usually takes several days of debugging to perform a measurement, and it can only be measured for a horizontal plane, so there are few application scenarios

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