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Building Information Modeling/ Virtual Design & Construction
Skanska has designed, constructed and built the new St Lars Bridge in central Linköping. The bridge is Sweden’s first multispan bridge with integrated abutments – in other words, it has two abutments and two intermediate supports.
The old bridge was about 70 years old and in a state of disrepair. When it was time to demolish and design a new bridge, Skanska secured the contract.
We presented a new design and alternative construction models in the tender stage, which were more resource-efficient and had a lower environmental impact, including:
• Materials and transportation savings. The abutments were designed to enable a higher foundation. This dramatically reduced the need for excavation and fill materials. In turn, this reduced the amount of long-distance haulage and local transportation (CO2 emissions generated by local transportation were reduced by at least 50 tonnes).
• Financial savings for the municipality. Construction of the bridge may have cost more than the original bridge, but since fewer materials were required and we could reuse much of the old bridge, the municipality saved about SEK 400,000.
• The Tinnerbäcken River did not need to be rerouted. The original plan was to reroute the river through a concrete channel. By preserving the stretch of water under the bridge, turbidity and other environmental impacts were avoided.
As part of the bridge project, we also created a small park to utilize the transportation route that was used during the construction period. The route is now a gravel serpentine path that winds down to the Mahonia Valley.
St Lars Bridge is located in central Linköping and is a vital part of everyday life for many people. Approximately 10,000 vehicles cross the bridge every day, as well as pedestrians and cyclists. The bridge is also important for public transport.
We began demolishing St Lars Bridge in 2006 and the new bridge was complete in 2007, about one year later.
Marknadssegment: Bridges, Roads, Concrete, Gravel and stone chippings
Our technical solution for the bridge and modification of the landscape significantly reduced the environmental impact of production and transportation. Our new proposal did not include rerouting the river, so we avoided casting a new concrete channel.
The new bridge has also increased accessibility for pedestrians, cyclists, drivers and public transport. The new route has also provided a safer traffic environment with fewer accidents.
Some of the resource and environmental savings: • Materials and transportation savings. Skanska designed a proposal that reduced the need for excavation and fill materials. Fewer materials also reduced the need for transportation (CO2 emissions generated by local transportation were reduced by at least 50 tonnes).
St Lars Bridge is located in central Linköping and is important for many people. We completed the project fast and efficiently for this very reason.
A key success factor was a process known as “active design”, which we applied throughout the entire project. This means that we constantly developed and tested new ideas for solution optimization.
One idea that we implemented was to save concrete from the old bridge, which was later crushed and reused as subbase for the new bridge. This dramatically reduced our use of materials, as well as the need for long-distance haulage and local transportation.
The design of the abutments enabled a higher foundation, which drastically reduced the need for excavation and fill materials.
We recycled granite block to supplement the existing embankment, thereby avoiding the need to reroute the river through a concrete channel.
Peter Polla was the Project Manager for St Lars Bridge.
“We learnt a great deal from the project, including how to identify opportunities for change despite the fact that the LOU procurement process is highly restrictive in the tender stage. We projected a bridge and water channel and delivered a completely different, and significantly better, product than the Municipality’s original plan. We also saved money for the Municipality of Linköping, while creating a unique recreational environment in central Linköping.”