Model changes and modifications are common occurrences in projects. Even with the widespread use of BIM technology today, the process simply shifts from traditional drawings to digital models. In this article, we will explore why BIM model changes happen and what key points we should pay attention to.
1. Reasons and Objectives for BIM Model Changes
During the construction phase, uncertainties related to equipment manufacturers and on-site information often lead to continuous updates and feedback in the BIM model. Various human and environmental factors can cause design changes, updated drawing versions, and adjustments to construction details to meet operational requirements on-site. Examples include construction principles, reserved spaces for doors and windows (MO), landscape elevation measurements, dimensions of finished surfaces, setbacks for decorative materials, and changes in equipment and decoration sizes.
Additionally, the modeling process involves clarifications and corrections related to model errors. To maintain the accuracy and real-time relevance of BIM information, it is essential to base the management model on the latest, approved version. Before releasing any updated drawings, confirmation of approval from the owner or engineering department is necessary. Including the approval date in each folder name helps distinguish versions and ensures reliable reference.
Because the BIM progress and labor division schedule only tracks major project tasks and their deadlines, it cannot monitor changes to new tasks arising during model development. Furthermore, a project may undergo multiple design changes throughout the model revision process. Assigning a BIM engineer to handle changes involves setting a deadline; if design changes occur within this period, the most recent revisions will serve as the basis for updating the BIM model.
2. What is the BIM Model Change Process and What Should it Include?
1. Model Change Notification Form
This form captures details about the model change, including the reason for the change, the name and location of the affected component (illustrated with 2D and 3D images), component ID, specific change content, responsible person, and change deadline. It is used when errors are found during model inspections or when feedback requests modifications. Once completed, the form is sent to the BIM engineer assigned to implement the change, ensuring clarity on the scope and timeline.
2. Model Change Response Form
After receiving the change notification, the BIM engineer completes the model update and performs a self-inspection. They then fill out the Model Change Response Form and submit it to the BIM manager. If errors are identified during review, the BIM manager provides feedback and requests further revisions. If approved, the BIM manager records the change completion in the Model Change Tracking Table, finalizing the process.
3. Model Change Tracking Table
To manage model changes efficiently, notifications and records are maintained in the Model Change Tracking Table. This table tracks the location, content, responsible person, and deadline for each change. Change status is categorized as “under change,” “change error,” or “completed change,” allowing effective control over pending modifications and ensuring timely updates to the BIM model.
That covers why BIM model changes occur and what we should pay attention to. I hope this article provides helpful insights!
For more related articles, please click on: BIM Models
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