roadway intersection design in geopak site michael gilham bentley civil michael gilham bentley civil

Roadway Intersection DesignIn GEOPAK Site

Roadway Intersection DesignIn GEOPAK Site

Michael GilhamBentley Civil

Michael GilhamBentley Civil

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 exitsGore AreasGore pond design

Presentation Overview

Why?User requests.Data and concept for this presentation

supplied by:

Mark LemieuxMark Lemieux

HNTBHNTB

Why use Site Modeler?

Amalgamates data from different sources into a single environment.GEOPAK SurveyChain and Profile AlignmentsCross SectionsShapesTIN files

Why use Site Modeler?

Speed of Design!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.

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…

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.

I. XS Reports>DTM InputII. XS Reports>DTM Prop 3D

Data Creation Options

I. XS Reports>DTM Input

Produces a DAT file of the Proposed surface.

Data Creation Options

II. XS Reports>DTM Prop 3D

Produces a DAT file of the combined Proposed and Existing surface.

Data Creation Options

3D Modeling Tools > 3D Cross Sections.

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.

Data Creation Options

Superelevation Tools > Shape to DTM Surface.

Produces a DAT file of the Shape surfaces.

Data Creation Options

Superelevation Tools > Shape to DTM Surface.

Best Option!!!

Data Creation Options

Superelevation Tools > Shape to DTM Surface.

Make Shapes wider than pavement surface.Either create additional shapes (as shown) or

Data Creation Options

Superelevation Tools > Shape to DTM Surface.

Make Shapes wider than pavement surface.Either create additional shapes (as shown) orCreate a new set of shapes with larger offsets.

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

How to get the data into Modeler?

Project>Import>Data>TIN Import the Existing and Proposed TINs as Objects.

Element>New/Edit>AlignmentsCreates 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.

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

What’s next?

Let’s go to the demo……

The Intersection

Site Modeler highlights a Design problem.

The Profile is 0.4 feet above pavement edge elevation

The Intersection

Site Model showing Intersection with original profile.

The Intersection

Site Model showing Intersection with amended profile.

The Intersection

There was a 0.8 foot difference in the profile elevation at the other

intersecting road!

The IntersectionCompleted!

Ready to cut XS’s, create Plan view stakeout drawing or Export to COGO for survey stakeout.

The Gore AreaSite Modeler has highlighted a Shape problem.

The Pond.

Questions?

Michael GilhamBentley Civil