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ABSTRACT
Flatness of the surface of building constructions is an important presumption for their right functionality. Accuracy of flatness measurement can be determined on the basis of standards dealing with geometric accuracy or on the basis of individual requirements on accuracy of a specific construction. The methods usable for flatness measurement are trigonometric method with a total station, geometric levelling, photogrammetry or 3D scanning. Choice of a suitable method depends on requirements on range and accuracy of the measurement. In 2015 we were commissioned to determine flatness of two floors and several walls in a shower bath of a swimming pool. It was a measurement for a complaint procedure. The client demanded standard deviation of flatness determination was 1.5 mm in whole surface. Next requirement was to measure all floor and wall tiles. 3D scanning was chosen as the most suitable method for these requirements. This paper describes the measurement procedure and also the processing technique as well as the form of the results handed over, which fulfilled both the required technical criteria and simplicity and transparency of formulation, which was easy to understand even for nonprofessional users.
Keywords: flatness; 3D scanning; accuracy
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INTRODUCTION
Flatness of the surface of the building construction is a very important indicator of rendition quality. You can determinate flatness of a different surface, for example flatness of the floor, wall, ceiling in the buildings or flatness of exterior surfaces such as road, courtyard or terrain after ground works. It is not only aesthetic parameter but it is also an important functional parameter in many cases. Our project was one of them. Caretaker of one building in the centre of Prague contacted department of special geodesy of CTU in Prague so as to find out whether the department is able to measure shape of floor with very high accuracy for a complaint procedure. The troubles were incorrect slopes of floors and wrong construction of wall tiles in the men's and women's shower bath. The measuring requirements were to measure every tile of all floors and all walls in both bathrooms with the standard deviation of flatness determination 1.5 mm in the whole surface. These requirements were possibly satisfied only with very accurate 3D scanning in...