A Method for Detecting Centerline Angle Error of Standard Steel Structure Based on Projection Method

Abstract

The invention discloses a method for detecting the center line angle error of a standard steel structure based on a projection method. The method of the invention uses a camera to photograph a docked entity structure and converts it into point cloud data, and points between a fixed standard steel structure and a standard steel structure to be docked The cloud data is calculated by interval selection, point cloud interception, two-dimensional plane projection, interval boundary point extraction, point cloud center point calculation, two-dimensional centerline equation fitting, and finally through two two-dimensional equations Simultaneously, the three-dimensional linear equations of the two structures are solved separately. Bring the two three-dimensional straight line equations into the angle calculation equation to obtain the angle error value of the two centerlines, and compare it with the engineering requirements to determine whether it is possible to connect. The invention patent has strong versatility and high efficiency.

Description

technical field [0001] The invention relates to a method for detecting the centerline angle error of a standard steel structure, belonging to the technical field of architectural surveying and mapping, and in particular to a method for extracting and detecting the centerline equation of a standard steel structure based on a projection method. Background technique [0002] The modular design and construction of large-scale buildings reduces the difficulty of building the whole building, but the individual errors of the modules will lead to an increase in the overall cumulative error after splicing, especially for the angle error of large steel structure buildings. Excessive angle errors may cause the building The stability of the body decreases, which may seriously make it difficult to weld between modules. Multiple module trimming and hoisting operations will cause waste of manpower and material resources. Therefore, the extraction of the centerline equation and error analysi...

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Problems solved by technology

[0002] The modular design and construction of large-scale buildings reduces the difficulty of building the whole building, but the individual errors of the modules will lead to an increase in the overall cumulative error after splicing, especially for the angle error of large steel structure buildings. Excessive angle errors may cause the building The stability of the body decreases, which may seriously make it difficult to weld between modules. Multiple module trimming and hoisting operations will cause waste of manpower and material resources. Therefore, the extraction of the centerline equation and error analysis of the key steel structures of each module are the prerequisites for engineering construction.

[0003] The application number is CN201610813932.7. The Chinese patent discloses an invention patent titled "Measuring Method for Butt Flatness of Large Process Pipelines Based on 3D Laser Scanner". This patent uses the least square cylinder fitting method based on radius to obtain the target of the pipeline function, and then use the Gauss-Newton method to solve the parameters, this method is suitable for cylindrical structures, but not for the centerline information acquisition of planar steel structures without specific constraint equations

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