Virtual design helped remove design conflicts - Gjønnes station

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Rebuilding of a station as part of major renewal of the Oslo metro rail line

Customer:
Kollektivtransportproduksjon AS (KTP)

Country:
Norway

Designers:
AAS-Jakobsen, Vianova Plan og Trafik

Contractor:
Veidekke Entreprenør AS

A combined BIM model helped to coordinate design disciplines and construction work when rebuilding a new station in the metro system of Oslo, Norway.  At least a half of the detected 350 design conflicts would have passed unnoticed without the use of modern virtual design tools.

A rebuilt Gjønnes station on the Kolsås Line of the Oslo Metro system was opened in 2012 after being closed for four years. The work at Gjønnes was part of the Oslo Metro Kolsåsbanen project, a long-term program which began already back in 2000 and meant an incremental renewal of the metro rail line between Sørbyhaugen and Kolsås. The renovation of the Gjønnes station started in May 2011 with an estimated project cost exceeding €100 million.

A combined BIM model was created and used to coordinate both the design disciplines and the construction of the new station. The model-based validation allowed the project team to detect a total of 350 conflicts between the designed technical systems. It was estimated that at least a half of these design conflicts would have passed unnoticed without the use of the combined BIM model.

Based on an estimate given by the Norwegian Road Authority, an average cost of change or conflict is about €8 100. This means that the software-aided BIM workflow helped the project save around €1.5 million.

‘The BIM software helped us identify over 350 expensive pitfalls – half of which were not detected using our normal workflows – saving the taxpayer an estimated €1 500 000.’

 

Virtual design analysis helps the design team and the contractor to remove conflicts between different technical systems.

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