CTC 440: LAB 3 (Horizontal Alignment)-Individual

Recreate the existing centerline for the Route 12 project on Inroads.

Summarize what you have done in a professional report:

·       Briefly describe the project

·       Briefly summarize the steps you used to recreate the horizontal alignment. 

·       Compare the radii of the existing curves to the design criteria (from lab 2) by providing a summary table showing PI Station, Radius, and Design Criteria minimum radius.

·       Provide a printout of your horizontal alignment in an appendix, and include graphics of your horizontal alignment. Label the curves on the graph and label the printout with the same numbers.  The idea is to provide a graphic which quickly shows which curves are nonstandard.

INROADS - Horizontal alignment

General Notes:

1-Use your own folder (computer, your username) to store your documents

2-Remember to use your initials on any file you create and keep them in your own folder

3-Remember to log out so that no one can get into your files.

Step 1: Tentatively locate the POB (Point of Beginning), PI’s (points of intersection) and POE (point of ending) using Microstation

Use xxwork.dgn as a working file. This file is a 3d file and can be downloaded in Lab 2.

The basemap and text files are attached as reference files. Go to Microstation: File, Reference to display or turn off the reference files and to control the display of the levels in the reference files.  In the basemap file turn off all levels but level 5 (edge of pavements).  In the text file turn off all level but level 59 (centerline). 

To tentatively identify points, place lines and used #7 (trim to intersection) to tie down the PI’s.

Step 2: Create a New Geometry File

File, New, Geometry, Apply

• Name: your initials
• Desc: Paris Hill

Step 3: Save the Geometry File

File, Save, Geometry Project

Note: Do this step periodically as you're working on the alignment. It's only temporary if not saved.

Step 4: Create a New Horizontal Alignment

File, New, Horizontal Alignment

Note: You can have multiple horizontal alignments in the geometry project.  

Tools, Customize, Horizontal Curve Set brings up the horizontal alignment toolbar where you can add, delete, and move PI’s; define horizontal curves (simple and spiral); and change the beginning station.  Go into the design criteria icon and turn off the design criteria lock.

Reproduce the existing alignment as close as possible (not an easy task since we don’t have the as-builts).  Hints:  Use microstation commands to reproduce the centerline of the existing edge of pavements, and use the intersection commands to find the PI’s.  Remember to add PI’s from south to north.

Add radii to the PI’s.

Change beginning station to 1+000 (optional, but it’s never a good idea to start at 0)

Note: Remember to File, Save, Geometry Project

 

Step 6: Load the DTM

File, Open, (Type-Surface *.dtm) terrainmodel.dtm

Step 7:  Cut Original Ground Profile

Evaluation, Profile, Create Profile

Highlight the terrainmodel surface, hit Apply, and identify location with a data point

If you have time, create another horizontal alignment (call it alternative 1) which eliminates the nonstandard curves in the existing alignment.

Save Geometry File and STOP!!!