BIM Coordination Guide
Leveraging scan data and BIM models for effective construction coordination.
What is BIM Coordination?
BIM coordination is the process of combining models from different disciplines (architecture, structure, MEP) to identify conflicts before construction. When combined with as-built scan data, teams can coordinate new work with existing conditions, preventing costly field changes.
The Role of Scan Data
Scan data provides the existing conditions baseline for coordination. Unlike unreliable record drawings, point clouds show what's actually built. This enables accurate clash detection between new design and existing infrastructure.
Coordination Workflow
A typical BIM coordination workflow includes several phases.
- 1. Scan existing conditions
- 2. Create as-built BIM model (Scan-to-BIM)
- 3. Import design models from all trades
- 4. Federate models in Navisworks/Revit
- 5. Run clash detection
- 6. Review and resolve clashes
- 7. Update models and verify
Clash Detection
Clash detection software identifies where elements from different models intersect or violate clearance rules. Clashes are categorized by severity and assigned to responsible parties for resolution. Regular clash meetings ensure issues are addressed before construction.
Common Clash Types
Understanding clash types helps prioritize resolution.
- Hard clashes: Physical intersections (pipe through beam)
- Soft clashes: Clearance violations (insufficient access)
- Workflow clashes: Scheduling conflicts
- Design clashes: Code or spec violations
Best Practices
Successful BIM coordination requires clear processes, regular meetings, model standards, and executive support. Scan data should be updated as conditions change. Document all clash resolutions for project records.
Key Takeaways
Scan data provides accurate existing conditions for coordination
Regular clash detection meetings prevent costly field changes
Categorize clashes by severity for efficient resolution
Document resolutions for project records
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