BIM models can be categorized into architectural, structural, electrical, plumbing and drainage, and HVAC models based on their specialties. Let’s explore each type in detail:
(1) Architectural Model: This model includes detailed geometric information such as wall thickness and height, floor thickness and elevation, as well as the size and placement of furniture within the building. An accurate architectural model provides a clear spatial reference for all stakeholders and professionals involved in the project.
(2) Structural Model: The structural BIM model focuses on precise design evaluation and demonstration. It ensures the accurate positioning of foundations, beams, slabs, columns, and steel structures. For instance, the basement structural space must precisely lock in the locations and dimensions of plates, beams, and columns to guide the layout of integrated pipeline networks. When steel structures are involved, node details must also be modeled for spatial accuracy.
(3) Electrical Model: Compared to other disciplines, electrical system layouts and installations are relatively flexible, with ample construction space. However, in projects where cable trays are large and difficult to adjust, an electrical 3D model is essential. This model helps plan cable tray routes in advance, minimizing design changes and on-site rework.
(4) Water Supply and Drainage Model: This discipline has strict requirements regarding pipeline angles, leading to high spatial demands for gravity-based systems. Other systems must avoid these areas to ensure proper installation space. Additionally, the components of the water supply and drainage system must be carefully considered, necessitating the creation of a dedicated 3D model.
(5) HVAC Model: A major challenge in HVAC design is the uncertainty that causes delays in prefabrication and assembly, even when installation is feasible. By developing a BIM HVAC model, the accuracy of HVAC design schemes is significantly improved, enabling reliable prefabrication and wider adoption of modular construction methods.
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