BIM is not just a single, standalone model managed by an individual participant. Instead, it consists of multiple interconnected sub-models, typically categorized into building models, structural models, and electromechanical models. Today, we will explore the main types of BIM models and what content they include.
1. BIM Building Model
The BIM building model primarily serves as an architectural space reference for all project stakeholders. Ideally, building design should be completed directly in 3D. However, when the BIM model is created from 2D design drawings, keeping the BIM building model updated becomes especially critical. Accurate representation of each building’s thickness, height, ceiling elevation, and the precise placement of furniture is essential. These details directly impact the collaboration between different disciplines.
2. BIM Structural Model
The BIM structural model ensures precise positioning of the structural foundation, beams, columns, as well as horizontal and vertical steel structures. This accuracy facilitates thorough design evaluation and verification. For steel structure buildings, the connections between steel components also need to be carefully detailed. For instance, when planning underground pipelines and cable trays, the underground structural elements such as plates, steel beams, and columns must be referenced.
3. BIM Electrical Model
While electrical systems usually require less building space and have relatively flexible cable tray routes, establishing a BIM electrical model is still important. In a BIM collaborative environment, each discipline needs its own 3D model to enable comprehensive evaluation and feasibility checks of the overall design. In particularly congested installation areas, large cable trays may lose flexibility, making early coordination critical to avoid costly construction changes.
4. BIM Water Supply and Drainage Model
Most construction projects include two main types of water supply and drainage systems: gravity systems and pressure systems. Gravity systems pose a significant challenge because pipelines must maintain specific angles to ensure proper water flow. During MEP coordination, sufficient space must be allocated for all pipelines to allow for correct installation. Additionally, to support pipeline prefabrication, the BIM model must include all components of the water supply and drainage system, such as valves, insulation layers, pumps, and connectors.
5. BIM HVAC Model
Contractors specializing in HVAC rely on BIM HVAC models to facilitate the prefabrication and installation of air ducts and air conditioning pipes, while also guiding on-site construction. Although some large contractors have the capacity to install HVAC equipment, uncertainties in design and construction changes often prevent the finalization of HVAC plans, making large-scale prefabrication difficult. Within a BIM environment, once the feasibility study is complete, the finalized HVAC plan can be used directly to guide prefabrication and installation.
That wraps up our overview of the main types of BIM models and their contents. I hope this article has been helpful!
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