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Building Information Modeling/ Virtual Design & Construction
Skanska has built the second phase of the Bromma Blocks shopping center in western Stockholm. There we have transformed an aircraft hangar from 1947 into an ultra-modern three-story shopping galleria with more than 80 stores, along with an underground garage with 330 parking spaces. The contract totaled SEK 700 M and the client was KF Fastigheter.
The aircraft hangar is a protected historical building and substantial portions of the exterior as well as the massive steel trusses with spans up to 75 meters and the unique interior space were preserved to retain an airport atmosphere. Energy efficiency was another important goal and KF Fastigheter has applied for GreenBuilding classification. In this manner, the old has been combined with the new.
During the construction period, the construction site was one of Stockholm’s largest, both in terms of number of workers as well as size. In March 2010, approximately 300 people were working on the 150,000 cubic-meter aircraft hangar.
Planning this project was therefore an extraordinary logistical challenge. There was also an economic boom underway when the programming and planning efforts were started in autumn 2006, which made it extra important to secure the appropriate expertise at the right time during the project.
Work on remodeling and extending Hanger 3 was started in June 2008 and concluded in September 2010, when Bromma Blocks was inaugurated.
John MöllerbergSkanska Sweden+46 10 44 80 541
Mejl John Möllerberg
Marknadssegment: Shopping centers/malls
Skanska and KF Fastigheter worked extensively on environmental issues. Energy efficiency was an important goal and we applied for GreenBuilding classification. That means that energy utilization is at least 25% lower than regulatory requirements, which benefits both tenants and the environment.
A carbon dioxide calculation was performed to quantify the positive effects of the project’s environmental efforts in terms of reduced emissions of carbon dioxide and carbon dioxide equivalents. With our environmental efforts on the project, carbon dioxide emissions were reduced by 500-600 tons compared with an equivalent construction project of Bromma Block’s size. That corresponds to 70 trips around the Earth.
Green Transports was a subproject where Skanska and KF Fastigheter developed models for reducing the volume of transportation. For example, we contracted with DHL so that all small deliveries were coordinated. When plaster was going to be transported from Belgium, we chose to do so via train and boat rather than truck.
Since the construction process entails an environmental impact, we certified the workplace in accordance with Skanska’s internal eco-labeling scheme, Green Workplace.
Green Workplace means that we reduced our climate impact in the workplace by, among other activities, utilizing energy-efficient lighting on site (both inside and out), placing high exhaust standards on machinery and imposing stricter requirements than those stipulated by law for chemicals and waste management.
The project was implemented using a partnering model, which meant that Skanska and KF Fastigheter collaborated, developing solutions together to make the project as cost-effective as possible.
This collaboration was initiated in autumn 2006 with preliminary studies, inventories and programming where we worked together with KF Fastigheter and design architects to formulate the product and determine a fixed budget for the project. In September 2010, Bromma Blocks was ready.
Construction was initiated in June 2008, when we completed major foundation work. The hanger is located on an old seabed and is, as our geotechnical engineer put it, “geotechnically interesting”. The groundwater runs just one meter below the surface in a thick layer of clay that has the same consistency as crème fraiche.
While when taken individually none of the geotechnical challenges were particularly complex, the combination of challenges in one and the same area made the project a considerable challenge requiring the involvement of numerous experts. Through our early awareness of these conditions, we were able to plan around them and ensure that we had the appropriate expertise in place.
The fact that the structure was a listed historical building had a big impact on the project and had to be factored in along with building act legislation and architectural goals. Among other things, we replaced the glass sections so that the building would be more energy efficient and be classified as a GreenBuilding. The appearance and grouping of the new glass sections is as similar to the original sections as was technically possible. Sheet glass was used to retain the original character of the façade. The hangar’s unique space, hangar doors and load-bearing construction remain, preserving the historic atmosphere.
3D rendering comprised an important tool both during the planning phase and for demonstrating and coordinating various operations. For example, all ceiling installations on the lower level, where existing beams made conduits along the length of the building impossible due to demands on ceiling heights. When everyone has a clear picture of what is going to be done, the work flows much more smoothly. We have even experimented with 4D, i.e. adding in the element of time to clarify our planning and the advance of the project.
Planning, regulations, technology and machinery are not everything, however. In a large project like this, a lot depends on everyone having a clear and common goal. Just imagine a workplace with 300 new employees and then the challenge becomes clear.
Consequently, a team contract was drawn up at an early stage between Skanska and KF Fastigheter. The contract spelled out the project goals and how we were going to work to achieve them. This was then disseminated to both skilled tradesmen and office workers, including through the introductory classes that everybody, including subcontractors, attended.
Examples of other important building blocks included the rapid dissemination of information, safety training, job satisfaction and an open atmosphere. Combined, they generated a positive force with high satisfaction, where safety risks were reported and quickly rectified, and where the right information reached the right individuals. John Möllerberg was Project Manager for the construction project.
“Communication has been a big challenge. Much of my job involves ensuring that the right people get the right amount of the right information. It’s fun when you see that things are working, when you put together a team that works well and enjoys their job.”
Everyone who worked on the project completed safety training. We also worked hard to create an open climate where workers report faults – for example when a safety railing is missing – and then we worked quickly to resolve these faults.
Information is oftentimes in short supply, which is why we set up TV displays that were able to quickly disseminate important information to office workers and tradesmen. This was a simple measure that yielded excellent results. We also invested in a defibrillator that we are extremely happy that we never had to use.
With these preparatory efforts we, together with the tradesmen and subcontractors, ensured that the right approach to safety was disseminated throughout the project, as well as ensured that we performed our tasks with the appropriate level of quality and productivity. During our pre-task planning, we were assisted greatly by 3D project planning in visualizing and planning our work.
“Thanks to knowledgeable and committed employees, Skanska has contributed greatly to the implementation of Bromma Blocks, Hanger 3, without any major disruptions, while holding project costs within the desired range.”
Claes Pernling, Head Project Manager at KF Fastigheter