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Building Information Modeling/ Virtual Design & Construction
Skanska Xchange is a concept for standardizing housing projects in Sweden, Finland and Norway. The first such project implemented in Sweden is the Nyhamn tenant-owner association on Gävle Strand, which is one of Gävle’s most desirable neighborhoods. There, 24 tenant-owner apartments were constructed in two buildings with occupancy in November 2010.
The goal of Skanska Xchange was to reduce production costs for housing by 15%. That results in the customer getting more for their money while we increase our profit.
The background to Skanska Xchange was our conviction that it is possible to simplify the construction process. There is a huge body of knowledge residing among Skanska’s employees, which is now being gathered into a knowledge bank and being made available to the entire company.
Prefabricated framework, joint purchasing and guide sheets for the construction process are some of the factors that can streamline construction. That results in shorter design and planning times, fewer mistakes, less resources and faster production.
Desirable housing in good areas is important for Skanska Xchange. Since we cap costs, it means that customers get a lot for their money.
The tenant-owner apartment buildings in Nyhamn feature an exciting architectural design with dark-gray rendered facades with white details in an irregular pattern. All of the apartments have two glassed-in balconies. The area is situated adjacent to the sea, within walking distance of the city center.
Tomas Moström+46 10 44 89 015
Mejl Tomas Moström
Marknadssegment: Apartment buildings
Koncept: Xchange, Building Information Modeling/ Virtual Design & Construction
Skanska Xchange is good for the environment in many ways. Customized gypsum and steel stud deliveries reduce the amount of wasted material. Skanska Xchange construction projects have a specified ceiling height, which allows us to do dimensional ordering of interior wall materials, lining, etc.
The construction site in Nyhamn was certified according to Skanska’s own eco-labeling system, Green Workplace. This means that a maximum of 5 percent of the waste from the construction site is permitted to go to landfill, the rest is sorted. Another example of a Green Workplace is the use of low-energy lamps for indoor and outdoor lighting. We always strive to make the best environmental choice, for example, green electricity and eco-labeled kitchen and hygiene products.
All of the chemicals used in Nyhamn have been carefully inspected. The requirement set for the development was that a minimum of 75 percent of the chemical products utilized should be classed as environmental-choice products or approved in the Swedish Chemicals Agency’s database.
The aim was to be a minimum of 30 percent below the requirement from the Swedish National Board of Housing, Building and Planning with regard to bought energy. Measurements demonstrate that the Nyhamn project is actually 36 percent below this requirement. Energy consumption will be followed up during the building’s guarantee period.
An additional method of checking the environmental impact of the project was through the measurement of the level of carbon dioxide-equivalents. We made our calculations in collaboration with Environmental Affairs during the project period.
The two multi-unit buildings in Nyhamn, Gävle, were a pilot project for Skanska Xchange, our new concept for standardization of housing projects in the Nordic region.
Skanska Xchange involves utilizing our experiences from previous projects and simplifying the construction process.
We gathered together a number of talented employees and started reviewing how we operate. We quickly realized that it is possible to reuse many solutions from previous projects. Among others, we are able to produce the framework in a factory rather than building it on site.
David Jerhov, Implementation Manager for Skanska Xchange, talks about the cost savings enabled by the concept:
“In time, we will probably be able to lower costs further. We are confident that we can achieve a 15-percent reduction through procurement, shorter design and planning times, fewer errors, requiring fewer resources and using products that are familiar and are faster to assemble.
In Nyhamn, we have even used digital building information models (BIM), which are one way of saving and reusing information. A digital model of a building is created and information about the entire project is saved, from the first ideas to the design, construction and management phases. That information is then reused in other projects.
We built the tenant-owner apartments in Nyhamn under our own administration and were in charge of all aspects of construction. Occupancy was in November 2010.
The beautiful and functional apartments were just the beginning of an entirely new residential area. Today, the area has been expanded and comprises additional housing, retail stores, restaurants, cafes and walking paths.
Work on Nyhamn proceeded very smoothly. Xchange specialists were on hand throughout the process to facilitate implementation of the building process system.
At the outset of the Nyhamn project, a local architect was hired to design the buildings within the framework of our platform manual.
Standardized technology choices, which are an element of Skanska Xchange, mean that project groups are familiar with the components and the materials. As a result, assembly goes faster and the risk of errors is minimized. The best components are selected, which ensures high quality. The fact that more components are built in factories results in lower costs.
Xchange includes control stations that assist project managers in indentifying good solutions from previous projects. That helps us avoid having to reinvent the wheel time and time again.
The Site Manager in Nyhamn had a guide sheet to assist in overseeing the construction project. Construction management developed a master timetable but also followed up on a weekly basis.
Guide sheets, control stations and technical choices are the tools that ensured that the construction process maintained a high quality level. For the construction crew, this inspired greater confidence since the risk of errors was minimized.
“It was one of the best organized construction sites I have ever seen. It was orderly and uncluttered with thorough and functional timetables,” says Tomas Moström, Xchange coordinator at Hus norr.
• 24 tenant-owner apartments in two buildings • 15 percent lower production costs • 2,316 square meters of residential space • 120 square meters of commercial space • 3,357 square meters total space