In 2016, Trevi implemented the preparatory works for the construction of Norvik Port, a new terminal container in Stockholm, Sweden. Trevi's works included pre-drilling activities, jet grouting, lime cement columns and dynamic compaction.
The port of Stockholm located in the historic centre of the city has always contributed to causing traffic congestion in urban areas. That is why Swedish authorities decided to build a new commercial dock in an extra-urban area, mostly dedicated to the storage of containers - Norvik Port.
In 2016, Stockholms Hamnar (Ports of Stockholm) awarded to Trevi a contract for the preparatory works for this construction.
The extra-urban area partially encompassed a zone made-up of filling material, whose sediments were characterised by a variable granulometry ranging from clay to boulders, even a few metres large. To support the heavy loads of the port, it has been necessary to consolidate the soil underneath the port yards through the installation of lime cement columns and jet grouting, while heavy dynamic compaction has been used for the crushed rock backfill's improvement.
The preparatory works implemented by Trevi between 2016 and 2017 for the Norvik Port included:
- Pre-drilling activities with a diameter of 270mm, by a down-the-hole hammer (for about 31,000 linear metres) with a Soilmec SM-30, through the backfill made of gravel and boulders
- Execution of 3,300 jet grouting columns with a diameter of 1,500mm, using Soilmec equipment SM-28 and SM-30, underneath a backfill of non-cohesive material and boulders for approximately 35,000 linear metres at a maximum depth of 31m
- Installation of 9,600 lime cement columns with a diameter of 800mm, for a total of about 205,000 linear metres.
After the successful completion of the consolidation works for the Norvik Port, NCC awarded Trevi an additional contract for soil improvement.
The second phase required the use of heavy dynamic compaction over an area with an extension of about 96,000m2 characterised by a regular grid of about 15,000 surface 'footprints'.
This technology, rarely applied in Sweden, satisfied the project's requirements and the tight work schedule, proving to be efficient and functional. It proved to be a goal-oriented method and confirms Trevi Group as a leader in the selection, proposal and application of modern and innovative technologies in any geotechnical sector.
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