Measurement of Flatness of a Portal Crane Collar

Abstract

The paper presents the application of the geodetic metrology methods to measurement of flatness of front surface of the portal crane collar. The collar has a diameter of 4.550 m and is welded to the front surface of a 8.985 m high column. A raised accuracy trigonometric method was applied to measure the flatness. The vertical and horizontal directions as well as the distance values for points located on the collar front surface were measured from one measuring position. Total Station TC 2002 (Leica Company) and especially designed sight shield (notification to the Polish Patent Office) were used in the tests. The obtained measurement accuracy (0.07 mm) allowed to evaluate the accuracy of tested collar workmanship, which should be contained within the interval of tolerance of 0.2 mm. Almost all of the points were contained within. The applied measurement method with the aiding equipment is fully applicable in this type of measurements characterized by very high accuracy.