BIM technology offers many functions, among which its 3D collision detection feature stands out for its practical value. This function helps identify clashes between different professional drawings during the design phase, preventing design changes caused by component conflicts during construction. As a result, projects can proceed according to plan, reducing waste of human, financial, and material resources throughout the construction process.
Collision detection using BIM can be performed either by the design team commissioned by the owner during the design phase or by the construction team before starting work. The author believes that conducting collision detection during the design stage provides designers with a clearer and more intuitive understanding, enabling them to make necessary corrections to the drawings. Additionally, completing collision detection early ensures the construction team can strictly follow the contractual requirements agreed upon with the owner.
While there are clear advantages to performing collision analysis during the design stage, there are also drawbacks. For example, it increases design fees paid by the owner and adds to the workload of the design team. After weighing these factors, the author concludes that conducting collision analysis at the design stage is more appropriate, as it better supports timely and high-quality project completion.
Traditionally, collision detection relied on two-dimensional drawings, where designers conducted self-checks and experienced engineers reviewed construction drawings. This method is cumbersome, time-consuming, and often fails to identify all component clashes efficiently.
With BIM technology, the 3D collision detection feature of BIM software can automatically detect conflicts between building components, such as between structural elements, mechanical systems, and electrical systems. It is important to note that these component collisions fall into two categories:
- Hard collisions: These occur when components physically penetrate each other. For example, mechanical and electrical elements like air ducts intersecting with structural components such as beams or columns.
- Soft collisions: These arise when the clearance between components does not meet national standards. For instance, a structural roadway beam may be too low, causing insufficient lane clearance, or a staircase beam may be too high, resulting in inadequate stair clearance according to building design standards.
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