12-Step Tekla Guide for Cast Unit Drawings

Introduction

Creating high-quality cast unit drawings in Tekla Structures is a combination of accurate modeling, organized assembly management, and efficient drawing setup. Below is a practical, field-tested workflow that helps ensure drawings are clear, consistent, and ready for use on site.

Whether you’re a rebar detailer, structural engineer, or BIM manager, this 12-step Tekla Guide outlines the steps that lead from imported models to clean DWG/PDF shop drawings.

1. Start from Model Inputs

In most cases, the initial input data comes from a combination of IFC and DWG files. These files are used as a reference to create structural components like columns, beams, walls, and slabs in Tekla.

Pro Tips:

• Always align IFC and DWG files to the correct project base point before modeling. Misalignments lead to incorrect drawing views and clash issues down the road.
• Use Tekla’s View Properties > Representation Colors to organize imported IFC models by discipline or change status. This helps track updates visually.

2. Verify Assembly Integrity

Before generating any cast unit drawing, ensure that all parts belong to the same assembly. Reinforcement, embeds, and custom parts must belong to the correct cast unit.

Pro Tips:

• Use a consistent rebar prefix (e.g., “C1_”) for all bars related to a single column. This ensures proper numbering and helps avoid duplicated bar marks.
• For custom bent meshes, model each leg separately and group them under a “Bent Mesh” rebar assembly.
• Hide parts not intended for production using template rules, for example, filter by color or name.

3. Set Up Cast Unit Views Strategically

The main views of a cast unit drawing should offer complete clarity: front, back, sides, top, and possibly section or 3D views depending on complexity. Tekla’s view Properties tool allows customization of what each view displays.

Pro Tips:

• Use different representation settings per view: visible lines for top views, hidden lines for bottom, and hatching for sections.
• Standardizing these settings allows for more effective drawing cloning later in the workflow.

4. Manage Dimensioning with Templates

Manual dimensioning is tedious and error-prone, especially in large projects. Tekla allows you to save custom dimensioning setups and reuse them across multiple drawings.

Pro Tips:

• Save templates for different element types such as columns, beams, and panels.
• Use predefined attributes to highlight important dimensions, like anchor bolt positions or key rebar locations.
• Group similar dimensions (e.g., spacing, hook lengths) to maintain drawing readability.

5. Use the Drawing Content Manager

Before issuing drawings, open the Drawing Content Manager to ensure all necessary parts, marks, and views are included. Missing annotations can delay production and cause site errors.

Pro Tips:

• Apply custom filters to quickly find missing rebar marks or incorrectly assigned parts.
• Create drawing templates that automatically include common content categories. For more practical tips on how to take advantage of Tekla’s built-in tools, read the Top 10 Most Useful Features in Tekla Structures, it includes several drawing-related features that can speed up your detailing workflow., such as all reinforcement in a cast unit.

6. Work Smarter with Selection Filters

When quick changes are needed, apply selection filters to isolate only the components you want to modify.

Pro Tips:

• Keep dedicated filters for columns, reinforcement, and embedded parts.
• This approach is especially useful when changes occur late in the project.

7. Improve Mesh Representation

Mesh representation can be improved using:

• Tekla Rebar Mesh View Creator automates mesh view creation with labeling and direction arrows.
• External software with PXML capabilities, allowing mesh images to be inserted back into drawing.

Pro Tip:

• Clearly define mesh directions and labels to avoid confusion during fabrication.

8. Exclude Unwanted Bars from Reinforcement Lists

To clean up reinforcement lists, you can exclude bars based on color or naming rules.

• Pro tip: Add a conditional formula in the list template that skips any bar with a predefined color or text pattern, keeping lists production-friendly.

9. Use 3D Illustrations to Communicate Complex Reinforcement

While 2D is standard for production, 3D visuals help stakeholders, especially non-technical ones, understand the structure better.

Pro Tips:

• Use Tekla’s high-quality screenshots with hidden line mode, smooth edges, and shadows for clarity.
• Include these images in drawing layouts or appendices.
• Remember that these 3D views do not update automatically when the model changes. Always regenerate before final issue.

10. Clone and Automate Drawing Layouts

Once you’ve built a well-structured cast unit drawing, clone it for similar elements using Tekla’s drawing cloning tools.

Pro Tips:

• Stick to a consistent naming convention for cast units (e.g., “WALL_A01,” “WALL_A02”) to streamline cloning.
• Save attribute sets for dimensions, marks, and views so they can be applied with one click across drawings.

11. Perform Quality Control Before Issuing

Before sending drawings to production or site, go through a quality control checklist.

Before final export:

• Drawing scales across all views
• Rebar marks, assembly prefixes, and revisions
• Filters and visibility settings, especially after cloning
• Cross-check drawing list with project schedule

Pro Tip:

• Recheck visibility filters before batch printing. A common mistake is forgetting that filters from one drawing can carry over during cloning, leading to missing or hidden parts.

12. Exporting the Final Drawing Package

Once your drawings are verified, export them to PDF and DWG formats using Tekla’s predefined templates.

Pro Tips:

• Include 3D snapshots or mesh images in your PDFs where applicable.
• Embed key metadata such as:
  • Cast unit name
  • Revision number
  • Issue date
  • Responsible modeler

This improves traceability and makes coordination with site teams and fabricators easier.

Conclusion

Producing production-ready cast unit drawings in Tekla Structures isn’t just about drafting. It’s about managing data, model integrity, and drawing clarity.

By following this 12-step Tekla Guide:

• You avoid errors and rework.
• Cut down drawing preparation time.
• Deliver clear, reliable documentation to the shop and the site.

This Tekla Guide combines Tekla’s drawing automation features with solid detailing practices, making it ideal for precast and reinforced concrete projects and BIM-driven environments.

FAQ

Q: What is the best way to start modeling for cast unit drawings in Tekla Structures?
A: Begin by importing IFC and DWG reference files and aligning them to the project base point. This ensures accuracy and consistency throughout the modeling and drawing process.

Q: How does drawing automation improve shop drawing efficiency in Tekla Structures?
A: Drawing automation allows you to reuse templates, clone drawing layouts, and apply standardized attributes, significantly reducing manual effort and improving consistency in shop drawings.

Q: Why is verifying assembly integrity important before generating cast unit drawings?
A: Proper assembly structure ensures that all parts, reinforcement, and embeds are grouped logically, which helps avoid errors in numbering, scheduling, and drawing output.

Q: How can selection filters improve the detailing workflow in Tekla?
A: Selection filters allow users to isolate specific elements like rebar or embedded parts, making it easier to apply changes, manage views, and streamline late-stage modifications.

Q: What quality checks should be performed before exporting cast unit drawings?
A: Verify drawing scales, rebar numbering, assembly prefixes, and visibility filters. It is especially important to recheck cloned drawings to prevent hidden or missing parts.