The right BIM Solution
Setting-up the BIM guideline and the BIM quality control for three pilot projects
AEC3 was commissioned to set up a guideline and to perform an accompanying quality control for three BIM pilot projects of the US Army Corps of Engineers. They were coordinated by the Nurnberg building authorities and supervised by the CAD-Stelle Bayern.
The BIM guideline for architects and engineers
Building Information Modeling, BIM, is a new way of planning and coordinating a project. With BIM generating consistent building models the planning procedures of architects and engineers can be facilitated as well as the construction companies’ preparations and the transfer of all the relevant data for the Facility Management. But all in all BIM increases the planning and cost certainty as well as the transparency for the client.
There is more and more specialisation in the construction business, the experts are more and more spread out geographically, in their fields of expertise and the way they are organized. As they all use different software applications it is quite challenging to cooperate successfully in the sense of building information modeling.
That's why it is important for the implementation and the use of BIM to sort out organisational and contractual issues as well as clarify the roles and responsibilities among the participants. The BIM guideline establishes a base for that.
The BIM guideline comprises of the following three parts:
- Part 1 - BIM Overview
- Part 2 - BIM for Architecture and BIM for MEP
- Part 3 - Catalogue of Architecture BIM objects & Catalogue of MEP BIM objects
Part 2 - BIM for Architecture and BIM for MEP - This part is focused on the specific planning requirements of these disciplines. It also contains the separate discipline models, the respective levels of detail for the different work stages and the merging of the discipline models into one.
Part 3 - catalogues of BIM objects - It contains the individual model elements and their required properties for the respective work stages. These detailed requirements define the building model’s exchange quality for the client.
On the basis of this BIM guideline the first BIM guide for Germany was elaborated.
Catalogue of BIM objects - Architecture - model element 'wall'
Quality control for the BIM data exchange
The quality for architecture and technical building services models were examined. The following test criteria were used:
- General requirements according to the recognized state-of-the-art
- Geometrical requirements
- Additional alphanumerical data that are to be maintained within the building model
The general examination of the exchanged IFC model followed afterwards. An IFC Syntax Checker was used to analyse the IFC model’s syntax. An IFC/BIM Viewer was used to check the project’s structural integrity. This tool also helped to verify the geometry’s correctness and the completeness of the individual model elements. Other agreed-upon checks like the standard BIM validation were also done with the viewer. Room, window and door schedules were generated and validated exemplarily.
Standard BIM-Validierung in einem IFC/BIM-Viewer - Deckenöffnung für den Aufzugsschacht fehlt
Both discipline models were merged in the end in order to do clash detection.
By choosing IFC as the file format all of the checks could be done independently of any proprietary software. As a result the architecture model and the IFC exchange were of very good quality already.
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