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.
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