The use of terrestrial laser scanning technology to determine the geometry of the primary lining in a tunnel

Terestrično lasersko skeniranje je v zadnjih dveh desetletjih povzročilo novo ero geodetskih meritev na številnih inženirskih področjih. Hitra in zanesljiva metoda izmere botruje dejstvu, da skeniranje prednjači po uporabi pred klasičnimi terenskimi izmerami tam, kjer s skeniranjem dosežemo zahtevano natančnost, kjer so pogoji za izmero zahtevnejši, kjer so objekti kompleksnejši in kjer bi z ostalimi metodami porabili bistveno več časa. Eden takšnih primerov je merjenje geometrije v predorih, saj izvajalce del zanima kakovost opravljenega dela oz. skladnost izvedenih del s projektno dokumentacijo. V magistrskem delu nas je zanimala uporaba in kakovost laserskih skenerjev pri določevanju geometrije primarne podgradnje. Podrobneje smo primerjali in analizirali rezultate, ki smo jih dobili z laserskima skenerjema BLK360 in ZEB Go. Za referenčne podatke smo privzeli rezultate tahimetrične izmere in laserskega skeniranja z Leica Nova MS50. Testne podatke smo zagotovili z izmero v železniškem predoru Pekel. Po analizi dobljenih rezultatov smo določili kriterije za uporabo laserskih skenerjev in tehnologije laserskega skeniranja za zajeme v predorih.Terrestrial laser scanning has led to a new era of surveying in many engineering fields in last two decades. The fast and reliable method of measurement fosters the fact that scanning takes precedence over classical terrestrial measurements in usage where scanning achieves the required accuracy, where conditions for measurement are more demanding, where objects are complex and where other methods would take much more time. One example with that kind of conditions is the measurement of geometry in tunnel, as contractors are interested in the quality of the work performed or compliance of the performed works with the project documentation. In our master\u27s thesis, we were interested in the usability and quality of laser scanners in determining the geometry of the tunnel primary lining. We compared and evaluated the results obtained with the BLK360 and ZEB Go laser scanners in more detail. The results of tachymetric measurement and laser scanning with a Leica Nova MS50 were used as reference data. We provided the test data by measuring in the Pekel railway tunnel. After analyzing the obtained results, we determined the criteria for the usability of laser scanners and laser scanning technology for measurements in tunnels