Clash Detection: Debugging in the Virtual Construction Site
One of the biggest cost items in construction projects is "Rework" costs. Discovering on-site that a ventilation duct collides with a steel beam causes work stoppage, material waste, and increased labor costs. BIM (Building Information Modeling) technology fundamentally solves this problem with **Clash Detection**.
Types of Clashes
We can discuss three types of clashes in a project:
**Hard Clash
** The physical intersection of two building elements.
* *Example:* A fire pipe passing through a column.
**Soft Clash (Clearance)
** Violation of the required space for assembly or maintenance of an element.
* *Example:* Insufficient distance in front of a valve for maintenance.
**Workflow Clash
** Timing errors during construction.
* *Example:* Trying to install pipes after a wall has been closed.
Cost Savings Analysis
Research (Penn State BIM Guide) shows that the cost of a clash increases logarithmically depending on which phase of the project it is detected.
| Detection Phase | Solution Cost (Estimate) | Impact Duration |
|---|---|---|
| Design (BIM) | $20 - $50 (Engineer Hours) | 1 Hour |
| Tender / Procurement | $500 - $1,000 (Revision) | 1 Day |
| Site (During Construction) | $5,000+ (Removal, Materials, Delays) | 3-7 Days |
Example Scenario: In a 50,000 m² industrial facility project, 1,500 hard clashes were detected and resolved at the design table through BIM coordination. If these errors had reached the site, they would have caused an average of 5%-10% deviation in the project budget.
Eos Proje Approach
At Eos Proje, we clash the "As-Built Model" produced through laser scanning with the "Design Model" (As-Designed). This way, we check not only the clashes between new systems but also the compatibility of new systems with the existing building.
Tools We Use:
Clash detection is not just a "bug finding" process; it is a process that guarantees the constructability of the project.
To eliminate on-site errors at the design stage, get coordination support.