Collision Check is a crucial and common step in construction engineering. Through collision detection, spatial conflicts in both the design and construction phases can be identified and resolved efficiently. BIM software plays a key role in this process by analyzing and eliminating reasonable collisions based on detected collision points. This collaborative approach aims to address issues before construction begins, thereby saving unnecessary modifications and reducing time wastage. In this article, I will discuss the collision detection capabilities of BIM software.
Generally, after verifying the accuracy of the model, it is imported into relevant BIM software for collision checking. Using the predetermined construction schedule, the software simulates the construction process and performs collision detection. There are two main types of collision inspections: hard collision and gap collision. Hard collision detects actual geometric intersections between two objects, while gap collision measures the specific distance between two geometries. This ensures that the collision results align with the real conflicts that may occur on site during construction, making the software’s spatial inspection highly practical.
For example, when analyzing collisions between MEP systems and concrete structures, it is necessary to determine if the detected collision points are reasonable. This is done by importing the finalized concrete structure model into the MEP model as a reference during the drawing phase. This process helps prevent unreasonable collisions in design. However, the collisions identified by BIM software must be verified on the construction site to decide whether they are valid conflicts or can be disregarded.
In the case of collisions between MEP and steel structures, challenges arise because MEP 2D design drawings often lack clear pipeline elevation details. Pipeline layout typically depends on actual site conditions during construction. To exclude certain collision points during detection, the accuracy of the MEP model must be improved during the drawing process, often by increasing the Level of Development (LOD). However, this drawing process is time-consuming, so the benefits of simulating the construction sequence should be carefully evaluated.
Although the collision check function can analyze collision points, it currently lacks detailed settings to exclude reasonable collisions—such as components that are supposed to connect or be offset from nearby elements. Each collision point must be examined and interpreted individually through a 3D visual interface to determine its validity, which can be time-intensive. Without sufficient experience, misjudgments are common. Therefore, it is hoped that future BIM software will offer more refined options within the collision check function to enhance collision analysis completeness.
That concludes the discussion on the collision detection function of BIM software. I hope this overview proves helpful to everyone involved in construction and design.
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