SURVEYING | TECHNICAL
NO ONE’S LEFT IN THE DARK
Automation and data synchronization light the way for tunnel survey success using Amberg Technologies’ systems on a challenging project in Norway. By Mary Jo Wagner
As a tunnel surveyor with Eiffage, a French civil engineering construction company, Christophe Poloni knows a thing or two about uncertainty. “I’ve worked on many underground projects and the
one thing they have all had in common is the uncertainty of not knowing what we would find,” says Poloni. “We plan and prepare as best we can but the unpredictable nature of geology can surprise us at any moment. So tunnel construction requires versatility, agility, efficiency and accuracy.” Since late 2022, Poloni has needed all four of those
attributes to successfully navigate the dark, dirty and cramped quarters of the Bjønnås Tunnel (Bjønnås) in eastern Norway. One of seven tunnels being built for the 17.5km-long (10.9 miles), E18 four-lane motorway that will connect the towns of Langangen and Rugtvedt, the Bjønnås Tunnel is a 2.5km-long (1.55 miles) twin- tube tunnel that will have 10 x 15m-long (49.2ft) cross passages and three technical buildings, each 16.8m (55.1ft) wide. Valued at NOK 5.2 billion (US$ 485 million), the
E18 Langangen-Rugtvedt project is one of the largest ongoing infrastructure projects in the country.
To meet tight tolerances, high expectations and an
intense pace, Poloni and his survey colleagues sought out enabling technology that would provide field autonomy to production crews and real-time analytical and reporting tools to maximize efficiency both in the tunnel and in office. “In tunnel construction, ‘delay’ is a dirty word,” says
Poloni. “No one wants to wait for surveyor support, but we can’t be everywhere at once. With the different sites and dynamic nature––literally––of the project, we wanted to adopt technology that would enhance tunneling efficiency and tracking, reduce downtime and streamline data flows.” Armed with Amberg Technologies’ Tunnel Solution,
a cloud-enabled software suite that automates and simplifies tunnel work, Poloni and his team have been able to steadily advance the Bjønnås excavation, minimizing downtime, reducing costs and optimizing collaboration.
THE RIGHT TECH From the outset, the project’s customer, Nye Veier, a company owned by the Norwegian Ministry of
Above: Bjønnås Tunnel: Scaling rock profile to achieve accurate profile with help of Amberg Navigator after using point cloud data to automatically calculate any deviations (underbreak or overbreak) from the design PHOTO CREDIT: MAXIME BOCRIE, EIFFAGE
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