Civil 3D: Expressing Elevations on 2-tier Structures

May 4, 2022 Leo Lavayen

Civil 3D has a couple of Structures that are 2-tier with cylindrical uppers and box shaped lowers:

  • Rectangular Structure 2-Tier Rectangular Frame
  • Rectangular Structure 2-Tier Circular Frame

   

The goal is to label both the Top of Structure (Rim) and Top of Box Elevations.  The first part is easy, there is a pre-defined property to populate the Civil 3D label for upper: Insertion Rim Elevation

The tricky part is figuring out the top box elevation.  There is NO property found in the Text Component Editor for the Structure labels:

The solution is simple, create a custom Expression to calculate the elevation value.  Civil 3D already knows the values it is just a matter of building the calculation:

The using the known values, shown below, the manually created Profile View Labels (pink) at the Rim and Top of Box are matched.

To create the needed calculation go to the Toolspace palette > Settings tab > Structure collection > Label Styles > Expressions > right click select New...

Here, you can assign a Name (that will be used in label component), Description (optional) and Build the Expressions itself:

{Insertion Rim Elevation}-({Rim to Sump Height}-{Barrel Height})

From here, add the custom expression to the label style from within the Text Component Editor:

Once the component is added the label will show the calculated value:

 

This is just another example of how custom expression can be used to create needed complex labels in Civil 3D.

About the Author

Leo Lavayen

Civil Applications Expert<br><br>As an Applications Expert, Leo is responsible for supporting, training and implementation of software for survey and civil engineering professionals. He has more than 17 years of experience helping large and small, public and private clients in the eastern United States.

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