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Doka expertise builds Karlatornet’s concrete core

Doka formwork being used during construction of Gothenburg’s first skyscraper, the 247m-high Karlatornet
Gothenburg’s first skyscraper, the 247m-high Karlatornet.

Gothenburg, Sweden’s second largest city, is undergoing rapid change with the new Karlastaden district taking shape in the Lindholmen port area. At its heart will be the 247m-high Karlatornet, or "Karla Tower", which will be the tallest building in the Nordic countries when completed in 2024.

Serneke Group’s Serneke Sverige is constructing the Skidmore, Owings and Merill (SOM) designed tower using Doka’s SCP 400, a self-climbing forming and working platform for high-rise construction, to form the structure’s 74 storey concrete core.


Doka’s SCP 400 guarantees a safe working environment from the high wind speeds experienced when constructing tall structures, while also providing space for any additional site equipment.

For construction of the Karlatornet the corners of the platform were modified to allow for the installation of massive steel nodes, while Doka’s steel-framed formwork Framax Xlife was used for the large-area forming of the building’s core.

One of the project’s biggest challenges, in terms of structural design, was the building’s narrow silhouette. To overcome this, outriggers and belt walls were created twice throughout the building using Doka Top 100 tec. Additionally, customized SL-1 trusses were installed to ensure fresh concrete load transfers into the columns and core while guaranteeing stability.

Doka formwork

Doka also developed a customized platform solution using its Xclimb 60 self-climbing formwork to facilitate installation and stressing of post-tensioning cables outside the belt walls.

Construction of the core also used 3D planning, which allowed speedy identification of potential problems and efficient resolution.

Karlatornet’s 74 floors will include 611 apartments, offices, a hotel, and a sky bar on the 69th floor.