An Alternative Approach to Control Measurements of Crane RailsReport as inadecuate




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Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, 1000 Ljubljana, Slovenia





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Abstract Horizontal and vertical positions of points for the control assessment of crane rails are classically determined separately. The procedure is time consuming and causes non-homogenous accuracy of the horizontal and vertical position of control points. The proposed alternative approach is based on polar measurements using a high accuracy total station instrument and a special platform with two precise surveying prisms fixed on it. Measurements are carried out from a single station thus ensuring a common coordinate system and homogenous accuracy. The position of the characteristic point of a rail is derived from the measured positions of both prisms with known geometry of the platform. The influence of platform non-horizontality is defined, along with its elimination procedure. Accuracy assessment is ensured with redundant measurements. Result of the proposed procedure is a numerical and graphical presentation of characteristic points. The control parameters required in international Eurocode standards are easily determined from them. View Full-Text

Keywords: control measurements; crane rails; electronic tachymeter; -L- platform control measurements; crane rails; electronic tachymeter; -L- platform





Author: Aleš Marjetič * , Klemen Kregar, Tomaž Ambrožič and Dušan Kogoj

Source: http://mdpi.com/



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