Abstract
Reliability and security of a power transmission depends on the state of the power grid and mainly on the state of the Extra-High Voltage pylons. The paper deals with deformation analysis of existing steel structure of selected Extra-High Voltage pylons which showed excessive differences comparing to the original design. In the assessment of the situation, geodetic survey of selected pylons of power grid that showed the greatest deformation was performed. On taken images, deformation of steel structures by using the FOTOMNG system was also analyzed. The proposed method allows a modeling of the structure of the object based on precisely obtained photographic documentation of the current state. It also represents a very effective method which allows to quickly and efficiently analyze the deformation in the structure of Extra-High Voltage pylons in the critical position of the power grid. Other benefits include the possibility of repeatable and safe measurement.
Highlights
In the context of scientific research and expert activities at the Faculty of Civil Engineering, VŠB-TU Ostrava was performed static analysis of deformed steel structure of selected Extra-High Voltage pylons which clearly showed excessive differences to the original design in the horizontal direction
The paper deals with deformation analysis of existing steel structure of selected Extra-High Voltage pylons which showed excessive differences comparing to the original design
The obtained images were used in a system FOTOMNG
Summary
In the context of scientific research and expert activities at the Faculty of Civil Engineering, VŠB-TU Ostrava was performed static analysis of deformed steel structure of selected Extra-High Voltage pylons which clearly showed excessive differences to the original design in the horizontal direction. The geodetic measurement of semi-height and altitude of the column’s verticality and the flatness of the concrete footing were carried out in selected, perpendicular, directions to the reflecting labels placed on the centre of the columns. With the measurement of the column verticality, the height of the concrete footings was measured repeatedly from two positions. The resulting deviations of the columns centre from the vertical axis were determined from two independent measured values - from the angular and longitudinal values in the given direction and the longitudinal values in the perpendicular direction. The resulting values were processed into a separate protocol for each column separately, indicating vertical positional deviations, height-targeted locations (measurement targets) and elevation differences of the top of the concrete footing. With the measurement of verticality of pylons was repeatedly targeted the elevation of the concrete base from two positions. High voltage pylons from a single image, we must follow a few rules and actions, such as the transformation of the image and image rotation, more in sections 2.1, 2.2 and 2.3
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