TECHNICAL | SURVEYING
Transport, made it clear that technology would play
a significant role––the design would be 100 percent model-based, 3D scans and 2D profiles would be required after every tunneling step, a cloud-based common data environment and collaboration platform would be used to connect all stakeholders, and detailed digital reports would need to be produced daily. With the varied technology on site and in the office,
coupled with some design complexities, the Eiffage project team wanted a reliable and adaptable solution that would enable them to seamlessly move from design to completion with confidence. As an avid user of Amberg Technologies, a
Switzerland-based leading provider of civil infrastructure solutions, Poloni and his team chose to adopt Amberg Tunnel to execute the Bjønnås excavation. “Amberg Tunnel is an all-in-one solution that not
only handles diverse file formats, it automates stake out, blasting, profiling, and other tasks with the push of a button,” says Poloni. “It also provides task-specific data analytics and real-time data synchronization. With all the variables involved in tunneling, we knew Amberg Technologies would be the one constant we could rely on. Most importantly, the automated nature of the field software would give us the time to focus on complex survey tasks.”
CREATING AUTONOMY To accommodate the shorter range of their scanner, the surveyors establish project control by setting two control points every 10m on each side of the tunnel and measure the points with a Leica total station, enabling them to maintain a sub-centimetre control network. Each day they install and measure new reference points and import them into the Amberg Navigator software on the tablets, providing the georeferenced positioning needed for all tunneling tasks. For production optimization and efficiency, each four-
person crew were given one total station, one scanner and one tablet running Amberg Navigator, a fit-for- purpose software solution that offers 28 automated tunneling tasks for heading guidance, excavation control and applying shotcrete linings. “With Navigator, the tunneling team can do everything
in the field with pre-established, targeted workflows,” says Poloni. “They can position the drill rig, stakeout points, verify the design, check earthworks, and capture scans in minutes.” With an approach that combines traditional total
stations, 3D laser scanning and the automation and intuitiveness of the Amberg Tunnel solution, the survey team has been successfully supporting and directing a daily routine of blasting, drilling, confirming, and reporting for the past 18 months.
Top: Two control points established every 10m on each side of the tunnel, captured with a Leica total station, enabling a sub-centimetre control network SOURCE AMBERG TECHNOLOGIES
Centre: Drill rig positioning PHOTO CREDIT: MAXIME BOCRIE, EIFFAGE Above: Loading blast holes PHOTO CREDIT: MAXIME BOCRIE, EIFFAGE
54 | Summer 2024
TUNNELING, AUTOMATED Directed by the survey and design data and Navigator’s workflows, blasting, shotcreting and drilling are semi- automated processes with real-time verification.
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