Large development project in Norra Djurgårdsstaden
Skanska has been commissioned by the City of Stockholm to build the new Saltkajen in Norra Djurgårdsstaden, Stockholm. The assignment includes the construction of a new pier with a dock and the reconstruction of the existing quay.
The assignment is part of the larger development project, Norra Djurgårdsstaden, where the old port and industrial area are being transformed into a modern and environmentally adapted urban district.
Piling work in the water
Production commenced at the turn of 2022/23 and began with piling work in the water. The work was carried out from large pontoons and cranes in the lake. Since the piles are drilled down instead of being driven down, noise is reduced.
The next step is dredging, followed by filling and concrete work.
Exciting assignment with surprises
The quay dates back to the late 1800s, so there are no exact drawings available. Therefore, renovating it is an exciting task. Various historical remnants from the old port operations, such as crane tracks and oil pipelines, have been uncovered.
Water is a challenge
Working in and near water presents challenges from a technical perspective and in terms of safety. To enhance safety, a major safety exercise was conducted at the start of the project, with a focus on water safety and the handling of maritime safety equipment.
It is of utmost importance that all employees feel secure when working in or near water, and that everyone knows how to respond in case of an accident.
High environmental standards
The client, the City of Stockholm, has high ambitions for the environment, and the project has stringent environmental requirements that cover piling, sheeting, soil cleaning, water and wastewater, concrete work, as well as pipe and sewerage work.
Concrete accounts for a large part of the carbon dioxide emissions due to the use of cement in its production. In the project, we are therefore testing a concrete mix where we replace parts of the cement with slag. However, it is essential to consider that the site is exposed to weather and water, which places particularly high demands. Therefore, we are conducting thorough tests and trial castings on concrete with a lower climate impact.
Testing concrete with slag
During the spring of 2023, three full-scale crown beam models were cast to test how much cement in the concrete can be replaced with slag without compromising strength and other properties. The amount of slag has been up to 30 percent.
The various concrete recipes have been continuously tested and evaluated for frost and pressure resistance, as well as heat development. The ambition is to reduce the carbon footprint by approximately 30 percent by using concrete with a lower climate impact.
We also use HVO 100 fuels in all our vehicles on the construction site. Additionally, we reuse sheet piling from other projects.
The project is planned to be completed in the first quarter of 2026.