06 Feb, 2020 By Catherine Moore
Ground engineering work has begun on Denmark’s 143m-high Lighthouse 2.0 building.
On completion, it will be the country’s tallest residential tower.
Aarsleff Ground Engineering is installing drilled pile foundations, drilling 28 piles with a diameter of 2,000mm and a total maximum length of 70m.
They are the deepest bored piles to be executed in Denmark as production piles.
Work is being undertaken by Aarsleff’s Bauer BG55 rig, assisted by two Hitachi (80t and 100t) mobile cranes and two dumper trucks.
Ground conditions comprise a 10m to 12m layer of sand followed by clay of high plasticity, typically found in coastal regions. This soil type tends to have problems due to its low strength, high compressibility and high level of volumetric changes.
Aarsleff also had to consider wind factor and high-rise challenges when looking at the various foundation options.
The drilled pile foundations allow the structural load to be transferred to the subsoil which has deeper load-bearing soil stratum to prevent long-term settlement of the building.
Due to the clay of high plasticity the casing is not installed to full depth, and bentonite was used to stabilise the drilled hole. The bentonite will be cleaned before concreting to achieve the correct amount of sand content according to European Standard.
The tower is located at Aarhus Ø, overlooking the waterfront. Aarhus Ø is the newest part of Aarhus, and features modern architecture separated by water canals. The Lighthouse will be built among other developments along the harbour, such as The Iceberg and Dokk1.
The project is expected to complete in 2022.
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Torfaen County Borough Council
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University of Sheffield