The BIM model shall consist of objects and elements that represent the actual dimensions of the building elements and the building equipment that will be installed on the project. Before modelling begins, the BIM Manager will work with the Design Team to develop the model and model view extraction structure for all the construction document files to assure coordination between disciplines. This structure shall be provided to the client so that the models can be reconstructed at a later date. BIM coordination requires the following model structure and features.
Definition of the “BIM Model”
The BIM Model is a combination of Graphical Data, Non-Graphical Data & Documents related to a building or construction project, all stored and managed in a Common Data Environment (CDE) platform. The Model starts off as the “design intent” model, then progresses to the construction information model. It provides the historical development of all the project information through the project stages during the capital delivery phase, produced between designers, contractors and their suppliers. It is very important to keep all this information for future reference, in case there is a problem or issue later. The BIM Model is based on the final, verified, “as-built” information, and is used to operate and maintain the building going forward also defines the Level of Definition (LoD), as being a combination of Level of graphical Detail (LOD), and Level of non-graphical data or Information (LOI), required at different stages of the project.
So, when you read the above definition, clearly the “BIM Model” is much more than just the 3D graphical BIM, Revit or IFC model – it represents all the project information.
Lists of Information Required for a BIM Model
- Rooms/Spaces (ideally geo or spatially located)
- Zones/Departments (collections of rooms/spaces/volumes)
- Systems or Assemblies (groups of components)
- Components or Equipment (and which system/assembly/zone/space they belong to)
- Products/Materials (and which system/assembly/zone/space they belong to)
- Maintenance Tasks, Spare Parts, and Tools/Resources required to maintain and operate the building
- Contact details of Companies/People involved in the project (designers, contractors, suppliers, etc)
- Documents related to the project, building, systems, products & material
Naming and Archiving of the BIM
- Each discipline has to maintain a Model Description Document. The document is a description of the contents of the model and it explains the purpose for which the model has been published and what the degree of precision is. The description document contains information about the modeling software used, the different versions created from the original model, and exceptions to these requirements. In addition, all naming conventions used, the maturity of the content and any restrictions on its use are documented in the description.The description document is published in parallel with the BIM, and it has to be updated whenever any changes that affect the content of the description occur in the model.Guideline for disciplines
All changes must be documented in the Model Description Document so that different parties can find them. At official publishing points, the publisher is responsible for the consequences caused by incomplete or incorrect documentation. The responsibilities are recorded in contracts and under general terms and conditions. In the case of Working Models, the use of the description is more explanatory, and therefore the requirements are considerably lower.