The time, economy and quality triangle has been improved significantly by a thorough value engineering process using the Virtual Design & Construction paradigm. Contractors are compelled to look for optimisations of their on-site production that improve time and economy. With VDC and value engineering implemented, such outcomes can be achieved in many project types. This is exemplified by NS20, a project including a 750m concrete tunnel for railway with an interface to an existing bridge and an adjacent tunnel.
Risks of delays in the production on the construction site were addressed at an early stage. The contractor’s method and site engineers, as well as the design team, worked closely around CN3´s 3D platform to develop a system of prefabricated cages. The cages were produced on and off-site, to minimize risk, and a detailed assembly model ensured a common understanding of the individual components and an efficient assembly process. A full integration of the reinforcement logistics embedded with BIM was deployed on this project, where the participants controlled the flow through a singular platform developed by CN3. On-site engineers received relevant data and 3D models on iPads that were utilised on-site.
The cages are produced on and off-site, to minimize risk, and a detailed assembly model ensured a common understanding of the individual components and an efficient assembly process.