When using the Swell BIM 3D Quantity for Revit plugin to calculate quantities in Revit models, several key factors must be considered to ensure accurate engineering measurements. These include the modeling requirements in Revit and the operational procedures of the Swell BIM 3D Quantity plugin. The following sections provide a detailed explanation:
How to Perform 3D Quantity Calculation for Revit Using Swell BIM
1. Model Refinement
Revit models often lack detailed elements such as secondary structures—including construction columns, lintels, ring beams, ceilings—and cushion layers. Before quantity calculation, these components should be arranged intelligently using the plugin’s layout function.
For instance, construction columns can be automatically generated by defining their sizes and generation rules. After this intelligent layout, it is essential to review and manually adjust any components to prevent discrepancies in quantity calculations.
Additionally, the Sver plugin offers model trimming and checking features that help identify and correct errors directly within Revit models, promoting standardization and improving calculation accuracy.
2. Batch Rename Family Names
The plugin supports batch modification of family names to comply with specific naming conventions required for model mapping. This feature is useful when Revit models do not initially follow the prescribed naming standards.
3. Adjust Default Component Keywords in Mapping Rules
The Swell BIM 3D Quantity plugin uses keywords in component type names to automate mapping, eliminating the need for manual mapping of each component. If the keywords in the model differ from the default keywords in the mapping rules, these defaults can be manually updated to match the model’s naming.
4. Model Mapping
Since the component classification in Revit models often differs from the calculation model’s system, a one-to-one correspondence must be established through model mapping. The Sver plugin can automatically map components based on keywords in their type names, but this mapping should always be reviewed and manually adjusted if necessary.
Once mapping is complete, the plugin calculates quantities based on the established mapping relationships and selected calculation rules.
5. Summary Calculation
The summary calculation feature allows users to view the quantities of all components in the project within a detailed table provided by the Sver plugin. Additionally, the plugin includes a component reverse lookup function: double-clicking a component in the list will locate it within the model. Combined with the “check component” feature, this enables thorough verification of quantities for individual components.
6. Important Precautions
1. After modifying the Revit model or mapping relationships, you must clear historical data before recalculating quantities. Otherwise, calculations will be based on the original model and mapping. To do this, select the option to clear historical data in the summary calculation dialog box, as shown below.
2. The default column deduction settings in the Sver plugin are incorrect. The software’s default of merging columns into walls contradicts common engineering quantity standards and must be manually corrected.
3. According to common standards, quantities for concealed columns and connecting beams should be included in the concrete wall totals. In the Swell plugin, concealed columns and connecting beams are mapped accordingly and their quantities are merged into those of the connected concrete walls.
4. Using the Swell 3D Quantity for Revit plugin, you can directly calculate formwork quantities for concrete components. If you need to calculate superelevation formwork, this can be set within the engineering measurement mode settings.
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