Method for measuring distortion of tall chimney based on outline

Abstract

The invention discloses a method for measuring distortion of a tall chimney based on an outline, which comprises the following steps of: (A) capturing the outline of the chimney by using a total station with a digital camera, and ensuring overlapping of two adjacently captured photos for the same outline of the chimney in a vertical direction; (B) quickly extracting the chimney outline in an image; (C) calculating an initial value of a chimney center; (D) selecting the most appropriate photo projected by a space section circle of a given height according to the initial value of the chimney center and known station coordinates; and (E) acquiring the initial value of iterative computation and carrying out the iterative computation on coordinates of the center of a circle and a radius of the space section circle. By the method, horizontal displacement monitoring for the chimney can be quickly realized, the precision is high, and the condition whether the method satisfies requirements or not can be judged through the circumstance whether the coordinates of the center of the circle and the radius of each section circle of the chimney can be quickly measured or not.

Description

technical field [0001] The invention belongs to the field of engineering measurement and relates to a method for accurately monitoring chimney deformation. Background technique [0002] With the development of my country's modernization cause, more and more high-rise buildings are rising. As one of the representatives of high-rise buildings, chimneys are of great significance to industrial production. While high-rise buildings serve modern construction production, there are also safety risks. Once an accident occurs, it will cause immeasurable losses to people's lives and national property. Engineering deformation observation is the guarantee for the safe and reliable operation of high-rise buildings, so super-high chimneys must be regularly monitored for safety. Electricity is the basic need of production and life in our country. At present, 80% of the electricity in our country comes from thermal power, and chimneys are indispensable buildings for thermal power plants. ...

AI Technical Summary

Problems solved by technology

The characteristics are: 1. It is impossible to directly measure the center of the chimney

Monitoring the chimney deformation is mainly to monitor the horizontal displacement of the center line of the chimney, but the center line is invisible and can only be measured indirectly

2. The surface is rough and the reflected echo is weak, so it is impossible to directly measure the surface point coordinates with a total station

3. Lack of texture information and no marker points

Due to the complexity of the chimney surface, it is impossible to ensure that every visible chimney outline is on the same section layer, so this method is imprecise in actual operation

Another disadvantage of traditional chimney measurement is that the monitoring workload is directly proportional to the number of cross-section layers that need to be obtained. When it is necessary to obtain the coordinates of points on the centerline of the chimney densely in order to accurately analyze the deformation trend of the centerline, the workload is huge.

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