This master’s thesis presents the application of terrestrial 3D laser scanning for the
analysis of the as-built condition of the newly constructed Legi Kamen cycling tunnel
and for the development of its information model in accordance with Building
Information Modeling (BIM) methodology. The tunnel, with a length of 105 m and an
approximate width of 4 m, served as a case study of an infrastructure object where
advanced spatial data acquisition and processing methods can be used to verify the
compliance of the constructed state with the design documentation. The aim of the
thesis was to assess the reliability and accuracy of data acquired using the Leica
RTC360 laser scanner and to demonstrate its applicability in generating as-built
models.
As part of the study, a high-density point cloud was acquired, georeferenced to a
geodetic network, and further processed using the software environments Cyclone
Register 360 PLUS and Leica 3DR. Special attention was given to spatial analysis
procedures, such as cross-sectional analysis and comparison with the designed
clearance profile defined in the PZI (Detailed Design) documentation. The results
showed that deviations between the as-built and designed states generally do not
exceed ±3 cm. This confirms that the tunnel lining was constructed appropriately and
in accordance with the construction tolerances specified in the design documentation
(IRGO Consulting d.o.o., 2020).
The processed data were subsequently used as a basis for upgrading the BIM model
for the purposes of the PID (As-Built Design Documentation). Accurate geometries
derived from the point cloud and the generated 3D mesh model enabled the integration
of the tunnel into the BIM-based information model. Such an approach ensures
improved traceability of the executed works, facilitates more efficient maintenance
planning and quality control, and opens possibilities for integration into broader
infrastructure management systems.
The results of the thesis confirm that the combination of terrestrial laser scanning and
BIM methodology represents a suitable and effective approach for documenting the
as-built condition of infrastructure objects such as tunnels. This approach enhances
both the quality and reliability of the data, providing significant added value in the
preparation of as-built (PID) documentation.
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