Ultra-low installation height delivers a 60-ton drivable surface with minimal excavation, and a five-hour install
The Challenge
For the new Norlys headquarters in Aalborg, Denmark, the project team needed an underground sprinkler water tank beneath areas with very limited build-up height. The solution had to provide a drivable surface capable of carrying heavy traffic loads while keeping excavation depth to a minimum and avoiding complex on-site works. Vertical clearance was the defining constraint, alongside stringent quality and testing requirements for fire protection systems.
The Solution
ViaCon engineered, manufactured, and installed a prefabricated corrugated steel sprinkler tank optimized for ultra-low cover without compromising structural capacity. In close collaboration with main contractor and subcontractor, we delivered a DN2400 tank in Z600 galvanized steel with D3 corrugation, verified to support a 60 t traffic load with as little as 0.3 m soil cover.
Configured for reliability and fast tie-in, the tank includes two Ø250 check valves integrated in sumps, a manhole brought to surface for full inspection access, and DIN-flanged nozzles for rapid PE pipe connections at grade. Quality was assured through factory pressure testing by an independent third party in Mülheim and re-testing on site in accordance with DBI guidelines.
Installation on site took just five hours: the customer craned the unit directly from the truck into the prepared excavation and our team completed the final fit-out. The minimal build-up height reduced excavation volumes and program time, while the prefabricated approach limited site interfaces and disruption.
The ViaCon Advantage
Technical specifications
