BIM Technology
Currently, BIM development is rapidly advancing in China, sparking diverse opinions on the subject. Both the industry and individual enterprises are responding according to their specific needs. From my perspective, whether in design or construction, the key issue I want to address today is the concept of BIM addition and subtraction. To illustrate this, let’s first refer to a diagram by Professor Li Heng from Hong Kong for a clearer visual understanding.
The diagram clearly highlights where BIM addition and subtraction come into play. On the design side, BIM represents an addition, while on the construction side, it serves as a subtraction. Why is this the case? Traditionally, the design phase is largely intangible, which often leads to numerous issues early in the process. Poor communication between designers, clients, and construction teams frequently results in rework, waste, and even forced halts, causing significant losses in labor, materials, and finances.
BIM technology can greatly mitigate and reduce these problems. Building a high-precision BIM model is akin to creating a digital twin of the building, which can be used to plan material transportation, perform quantity take-offs, and coordinate in 3D. This 3D model disrupts traditional designer delivery methods and offers clear advantages over conventional 2D documentation during construction. It provides an intuitive, visual virtual environment and information platform where many potential design and construction issues can be anticipated and optimized.
Moreover, high-precision BIM models support various analyses including sun exposure, temperature and humidity, noise, air quality, airflow, and landscape. They also enable internal and external microenvironment studies, environmental impact assessments, functional analyses, color and material comparisons, and construction method evaluations. Essentially, 3D models represent the surrounding environment, anticipate potential construction emergencies, estimate material quantities, and even project costs before construction begins. This comprehensive approach constitutes the “addition” aspect of BIM, which was previously unavailable in traditional design processes, and understandably results in a slight increase in initial design and construction costs.
Conversely, the “subtraction” aspect of BIM becomes evident during construction. Because the detailed 3D BIM model is prepared in advance, all potential problems and cost inefficiencies—such as clash detection, material management, logistics, and labor input—are simulated beforehand. This proactive approach eliminates many issues and allows for more rational cost allocation. By guiding construction based on these simulations, contractors gain deeper understanding, stronger collaboration, and better implementation of solutions derived from virtual construction.
This leads to significant benefits: reduced costs, shorter construction timelines, fewer quality and safety incidents, less material waste, and lower energy consumption. Ultimately, these improvements bring substantial economic value to construction projects, representing the “subtraction” benefit of BIM technology.
In summary, this article has explored the concept of BIM addition and subtraction. While some observations are based on the current situation in China, I firmly believe that as BIM understanding and adoption continue to grow across the country and industry, its impact will become increasingly positive and far-reaching.
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