Method for monitoring assembly process of prefabricated concrete member based on stereoscopic vision

Abstract

The invention discloses a prefabricated concrete member assembly process monitoring method based on stereoscopic vision, which applies a binocular camera to a prefabricated member hoisting construction process, provides a target classification and center positioning method based on ellipse detection, establishes a reference coordinate system and a member coordinate system according to the set target, selects corresponding control points, monitors the sleeve-steel bar alignment process, and adjusts the postures of the components, wherein when the errors of the control points are small enough, the components can fall down smoothly. And when the component falls to the target height, accurate adjustment is started, meanwhile, errors of the multiple control points are controlled, and when the errors are reduced to be within an allowable range, the structural assembly is completed. Compared with a traditional mode, the method has the advantages that the labor cost and the equipment investment are reduced, and the deviation value can be clearly provided; in addition, the provided circle center detection based on deep learning can improve the detection rate and accuracy. According to the structure hoisting monitoring based on coordinate system conversion, three processes of structure hoisting can be effectively measured.

Description

technical field [0001] The invention relates to a method for monitoring the assembly process of prefabricated concrete components based on stereo vision, and belongs to the technical field of structure construction monitoring. Background technique [0002] In recent decades, with the continuous development of construction industrialization, the prefabricated structure has the advantages of reducing construction time and cost, saving labor, and reducing pollution due to its production and construction mode. It is promoting the promotion and use of this type of technology all over the world. At present, many scholars have applied new technologies to the construction process of prefabricated structures. However, in terms of the current status of the civil engineering industry, these emerging technologies are mostly used in the acceptance and management of prefabricated components. Displacement measurements are still carried out with tools such as levels, theodolites, and total ...

AI Technical Summary

Problems solved by technology

Lidar can directly obtain the 3D point cloud data of the structure through laser scanning. It has received extensive attention in the field of civil engineering in recent years, but the error is relatively large, and the TLS equipment is expensive and cannot be used in large quantities.

Photogrammetry is a cheaper and more convenient measurement method. A single image can accurately calculate the plane displacement, but the estimated depth often has a large error

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