Aarau Cantonal Hospital - built on data
What does BIM2Field actually mean? Patric Sommer: Put simply, the BIM2Field method is the continuation of the digital chain from planning to the construction site. There are no more 2D plans on the construction site; everyone involved communicates using digital building models. These detailed, three-dimensional representations contain geometric information about the shape, size and position of the construction elements as well as semantic information about materials, costs, schedules and other relevant data. This information is called up on site on a tablet or in the digital plan house. Components such as formwork elements or walls are precisely measured using a total station.
"As a backup, we had ordered conventional plans up to the first floor. But we quickly saw that it worked."
Patric Sommer, Senior BIM Manager
What are the advantages of BIM2Field in interior fit-out? The BIM2Field method bridges the gap between planning and execution. This allows the full potential of digitalization to unfold and enables cost-efficient and intelligent work on the construction site. In addition, machine-readable BIM data can be used to prefabricate components such as panels, profiles or building technology components, which is more resource-efficient than cutting to size on the construction site with waste. The prefabricated parts are then delivered to the right place in the building on the construction site as required, assembled according to the modular principle and digitally measured and installed on site. This means that we can also use the BIM2Field method to profitably optimize work preparation and logistics and increase accuracy and efficiency. In addition, the BIM2Field method promotes communication and collaboration within the project team by making digital construction data available on the construction site in real time. The information content of a BIM model enables a better understanding of complex structures and their construction processes.
What prompted you to launch a BIM2Field pilot project for the interior fit-out? As a driving force for digital construction in major projects, Implenia has always successfully applied innovative approaches aimed at seamlessly transferring digital preliminary work from BIM planning to execution and operation. This was also the case with the KSA: together with our architecture partner Burckhardt Swiss, we developed a BIM2Field pilot project for the drywall construction. On the one hand, this involved creating installation models that were compared with the actual situation on site using laser scans. Secondly, we worked with a drywall construction partner to define the work processes for the model-based measurement of the walls and substructure.
What were the sticking points when putting this into practice? We were most concerned with the question of how we could take into account dimensional deviations in the already constructed shell and façade elements and comply with the tolerance values for drywall construction, which are in the millimetre range.
What lessons did Implenia learn from this pilot project? In order to be able to react appropriately to millimetre deviations in the shell construction during the interior fit-out, it is crucial to establish a comprehensive and reference system in the building during the shell construction work. We adapt the knowledge gained to subsequent projects.
The new KSA building "Dreiklang" in brief:
- The building concept for the new Aarau Cantonal Hospital focuses on functionality and short distances for staff and patients.
- On a floor area of around 110000 square meters, 472 inpatient beds, 130 day clinic places and 21 operating theatres are planned for the future.
- The new building is divided into three main areas: Outpatient clinics, functional areas and wards. Nevertheless, the areas form a single unit in the overall building.
