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 10 m on each side of the tunnel and measure the points with a Leica total station, enabling them to maintain a sub-centimeter control network. Each day they install and measure new reference points and import them into the 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. 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. “A significant advantage with Amberg Tunnel is that all of the construction guidance is based on parameters and reference points that we set and import into Navigator,” says Poloni. “We can define where a profile should be measured, how many points should be measured, at what interval, and at what accuracy. And we can completely lock it down so the production team just has to hit buttons as the software guides them. They can’t change the workflow or move forward if there’s an error or they haven’t done one step or measurement. It gives
A 2D map view of the tunnel color-coded to show different layers of shotcrete thickness. The light blue section is recently applied shotcrete. Crews can get the thickness and correspond-ing position on the tunnel wall by choosing any point on the map. They can also view the same map in 3D showing the latest shotcrete layer applied in blue. Image credit: Amberg Technolo-gies
The survey team sets two control points every 10 m on each side of the tunnel and capture the points with a Leica total station, enabling them to maintain a sub-centimeter control net-work. Image credit: Amberg Technologies
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Summer 2024 csengineermag.com
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