1. Roadway Intersection Design In GEOPAK Site
Michael Gilham
Bentley Civil

2. Presentation Overview
What will we be looking at?
We will investigate areas of Roadway design that have traditionally been a challenge with GEOPAK Road tools.
At Grade Intersections.
Ramp exits
Gore Areas
Gore pond design
In this session, we will take proposed cross sections generated by roadway design to complete an intersection model with the Site Modeler tool. The methodologies discussed here can be utilized in other areas of tedious roadway designs to supplement the roadway project – examples include the infield of a loop ramp.

3. Presentation Overview
Why?
User requests.
Data and concept for this presentation supplied by:
Mark Lemieux
HNTB

4. Why use Site Modeler?
Amalgamates data from different sources into a single environment.
GEOPAK Survey
Chain and Profile Alignments
Cross Sections
Shapes
TIN files

5. Why use Site Modeler? Speed of Design! Accuracy.
Every design change is immediately visually displayed for the Designer.
The design is dynamic and modifiable.
Accuracy.
Points are densely and strategically created which provides the Designer with a more complete design.

6. We need to import the known Roadway data into Site Modeler.
Where to start?
We need to import the known Roadway data into Site Modeler.
Existing Surface TIN.
Roadway alignments
Finished Surface TINs.
Specific plan graphics.
Edge of pavement
Edge of medians
etc…

7. Data Creation Options Create a TIN file from Roadway Cross Sections.
GEOPAK provides 2 options to create TIN files directly from the roadway XS’s.
XS Reports>DTM Input
XS Reports>DTM Prop 3D

8. Data Creation Options XS Reports>DTM Input
Produces a DAT file of the Proposed surface.

9. Data Creation Options XS Reports>DTM Prop 3D
Produces a DAT file of the combined Proposed and Existing surface.

10. Data Creation Options
3D Modeling Tools > 3D Cross Sections.

11. Data Creation Options 3D Modeling Tools > 3D Cross Sections.
Draws the combined existing and proposed surface XS into a 3D DGN file.
These can then be extracted to a DAT file and Triangulated using the DTM tools.

12. Data Creation Options Superelevation Tools > Shape to DTM Surface.
Produces a DAT file of the Shape surfaces.

13. Best Option!!! Data Creation Options
Superelevation Tools > Shape to DTM Surface.
Best Option!!!

14. Data Creation Options Superelevation Tools > Shape to DTM Surface.
Make Shapes wider than pavement surface.
Either create additional shapes (as shown) or

15. Data Creation Options Superelevation Tools > Shape to DTM Surface.
Make Shapes wider than pavement surface.
Either create additional shapes (as shown) or
Create a new set of shapes with larger offsets.

16. Data Creation Options
Any of these DAT files can then be either imported directly into Site Modeler…
Project>Import>Data>DAT File
..or triangulated and imported to Site Modeler.
Project>Import>Data>TIN File

17. How to get the data into Modeler?
Project>Import>Data>TIN
Import the Existing and Proposed TINs as Objects.
Element>New/Edit>Alignments
Creates a Site Element from COGO Chain and Profile.
Element>New/Edit>Drape
Create edge of pavement median elements by draping the MS graphic onto the corresponding TIN Object.

18. What’s next? Start Modeling!
After importing the known data, we will set about creating the unknown data.
At Grade Intersections.
Gore Area
Infield pond design

19. What’s next?
Let’s go to the demo……

20. The Intersection Site Modeler highlights a Design problem.
The Profile is 0.4 feet above pavement edge elevation

21. The Intersection
Site Model showing Intersection with original profile.

22. The Intersection
Site Model showing Intersection with amended profile.

23. The Intersection
There was a 0.8 foot difference in the profile elevation at the other intersecting road!

24. The Intersection Completed!
Ready to cut XS’s, create Plan view stakeout drawing or Export to COGO for survey stakeout.

25. The Gore Area
Site Modeler has highlighted a Shape problem.

26. The Pond.

27. Questions?
Michael Gilham
Bentley Civil