|
TPC allows you to insert vertical curves into any traverse, modifying it's vertical alignment. The elevations of the traverse points that fall between the BC (Beginning of Curve) and EC (Ending of Curve) are automatically updated according to their respective vertical curves.
When you work with vertical curves, you would like to:
•Automatically identify grade breaks that could require a vertical curve.
•Automatically assign the curve length based on the grade change.
•Compute a single vertical curve or compute all of them in the alignment.
•Specify the vertical alignment (station/elevation) for a traverse and automatically compute the vertical curves and tangent grades between the curves.
•Insert BC/EC points into the traverse.
•Allow unbalanced vertical curves (L1 not equal to L2).
•View the original vertical curve tangents along with the vertical curve.
•Label the vertical curves in a drawing.
The Vertical Curve View
The Vertical Curve View displays the vertical curve data associated with a traverse. You can enter VPIs (Vertical Points of Intersection), grades, stations, etc.
To access the Vertical Curve View, open a traverse and choose Windows | Vertical Curve View.
Working With a Copy of the Alignment Traverse
If your alignment traverse contains the raw data that created the alignment (bearings, distance, curves, spirals, etc.), you will want to make a copy of it and compute the vertical curves in the copy. If you compute vertical curves in the original alignment traverse, you may get a mix of raw data to VPIs that doesn't work with the vertical curve BC/EC points.
See Copying the Alignment Traverse.
Inserting Vertical Curves Automatically
If your traverse (alignment) already has grade breaks in it, TPC can identify the grade breaks and automatically add vertical curves with the appropriate lengths. This is typical of road design where you have identified the vertical tangents and are ready to refine the alignment with vertical curves.
See Adding Vertical Curves Automatically.
Entering Vertical Curves Manually
In addition to having TPC generate the vertical curves automatically, you can enter vertical curves manually. This allows you to use the vertical curve data given in a set of construction drawings for example.
See Adding Vertical Curves Manually.
Computing Vertical Curves
Once you have identified the grade breaks in the alignment and specified the curve lengths you want, you need to recompute the vertical alignment of the traverse.
See Computing Vertical Curves.
Viewing Vertical Curves
Vertical curves are viewed along with the profile for the traverse or alignment.
•Right click a blank spot in the Drawing View and choose Profile View. You may also need to choose View | Zoom | Zoom Extents.
•In the Miscellaneous tab, turn on [X] Include Vertical Curves.
•Choose OK.
See Drawing Vertical Curves.
Related Topics
Alignments
|
