These drawings reflect any changes or deviations from the original design that occurred during construction, providing a precise record of the completed project. Here's a detailed overview of what as-built CAD drawing services typically involve:
1. Purpose of As-Built CAD Drawings
Documentation:
- As-built drawings serve as a record of the final built conditions, including any modifications or alterations made during construction.
- They are essential for future renovations, maintenance, or expansions as they provide an accurate blueprint of the existing structure.
Verification:
- These drawings verify that the construction was completed according to the revised plans and specifications.
- They help in identifying any discrepancies between the original design and the finished structure.
Compliance and Legal Requirements:
- As-built drawings are often required for compliance with local building codes and regulations.
- They may be necessary for obtaining final approvals or certificates of occupancy.
2. Process of Creating As-Built CAD Drawings
Site Survey and Data Collection:
- Conducting a thorough on-site survey to measure and document the actual dimensions, locations, and conditions of the built elements.
- Using tools like laser scanners, total stations, or manual measuring devices to capture precise data.
Comparison with Original Plans:
- Comparing the original design drawings with the on-site conditions to identify any deviations, changes, or additions made during construction.
- This comparison ensures that the as-built drawings accurately reflect the current state of the structure.
CAD Modeling and Drafting:
- Translating the collected data into detailed CAD drawings using software like AutoCAD, Revit, or other CAD programs.
- Updating existing CAD files to include all changes, such as relocated walls, adjusted dimensions, new installations, or removed features.
Incorporation of Revisions:
- Including all changes made during construction, such as material substitutions, rerouted utilities, or changes in structural elements.
- Marking these revisions clearly in the CAD drawings, often using specific layers, colors, or annotations.
3. Components of As-Built CAD Drawings
Architectural Elements:
- Floor plans, elevations, and sections that show the final layout, dimensions, and finishes of the building.
- Detailed drawings of doors, windows, walls, and other architectural features as they were constructed.
Structural Elements:
- Comparing the original design drawings with the on-site conditions to identify any deviations, changes, or additions made during construction.
- Ensuring that all structural modifications are accurately documented.
Mechanical, Electrical, and Plumbing (MEP) Systems:
- Drawings of MEP systems, including HVAC, electrical wiring, plumbing, and fire protection systems.
- Capturing the actual routing, connections, and installation details of these systems.
Site and Civil Elements:
- As-built drawings of site-related elements, such as grading, landscaping, drainage systems, and utilities.
- Reflecting the final locations and conditions of these site features.
4. Benefits of As-Built CAD Drawings
Accurate Record Keeping:
- Provides an accurate and detailed record of the completed project, which is invaluable for future reference, renovations, or expansions.
- Helps in troubleshooting issues that may arise later by providing a clear understanding of what was actually built.
Improved Maintenance and Operations:
- Facility managers and maintenance teams can rely on as-built drawings to understand the building's systems and structure, making maintenance more efficient.
- These drawings can be used to plan and execute repairs or upgrades without unexpected surprises.
Enhanced Communication:
- As-built drawings facilitate clear communication between owners, contractors, and future designers by providing a common reference point.
- They help in avoiding misunderstandings or errors in future projects.
Compliance and Legal Assurance:
- Ensures that the building complies with all relevant regulations and codes, as the drawings reflect the final, approved state of the project.
- Provides a legally recognized document that can be used in the event of disputes or claims.
5. Integration with BIM (Building Information Modeling)
BIM Model Creation:
- Converting as-built CAD drawings into a BIM model, which provides a 3D representation of the building and integrates all relevant data.
- BIM models are particularly useful for managing complex buildings and for planning future modifications.
Data Integration:
- Including all relevant data, such as material specifications, equipment details, and manufacturer information, within the BIM model.
- This integration helps in making informed decisions during the building’s lifecycle.
6. Formats and Deliverables
2D CAD Drawings:
- Standard deliverable formats include DWG, DXF, or PDF, providing detailed 2D representations of the building.
- These drawings are typically layered to allow for easy interpretation and use.
3D Models:
- In addition to 2D drawings, 3D CAD models may be provided, offering a more comprehensive view of the as-built conditions.
- These models can be used for visualization, analysis, and future design work.
Annotated Drawings:
- Providing annotated versions of the as-built drawings, highlighting key changes, and explaining the reasons behind modifications.
- Annotations help in understanding the rationale behind deviations from the original plans.
As-built CAD drawings are crucial for ensuring that the final product matches the design intent, while also accounting for the inevitable changes that occur during construction. These drawings provide a reliable, accurate reference for anyone involved in the building’s future, from maintenance teams to designers planning new projects.