Abstract
This paper briefly presents the operation principle, the ability of application of gyrotheodolite to the tunnel orientation. The paper also presents a comparison of the accuracy between the traverse established with traditional method, measuring angles and sides, and the traverse inside the tunnel with azimuth of measured sides determined by gyrotheodolite. From the comparison, the advantages, disadvantages and the ability of application of the gyrotheodolite in order to ensure and improve the accuracy of the tunnel orientation when constructing the subway tunnel by TBM technology (Tunnel Boring Machine) in Vietnam were analyzed and evaluated.
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