SUR 4201L - Lab 2

 

 

 

Horizontal Alignment Design

 

 

OBJECTIVE

 

The goal of this lab is to design an efficient horizontal alignment from point A to point B.  Several interactive GEOPAK functions will be used to layout and modify your design. This graphic geometry will then be converted into a ‘chain’, which GEOPAK recognizes as a complete 2-dimensional road.  You will take care of the following specification as discussed in Lab # 2

 

  • Starting tangent azimuth = 90 degrees
  • Ending tangent azimuth = 90 degrees
  • Minimum distance from baseline to any structure = 200ft
  • Minimum distance from baseline to wetlands = 500ft
  • Minimum distance from baseline to tract boundary = 400ft

 

STEPS

 

Create a new road2.dgn file based on the class seed file (sur4201seed.dgn).  Reference the buffers you created in Lab # 2 buffers.dgn and the original site data (lox.dgn).  Now you can begin to layout an alignment.  We will be achieving the same graphic representation for the road as done in Lab # 2, except that we will be using some of the Geopak tools this time.

 

  1. Applications
  2. GEOPAK ROAD
  3. Geometry
  4. Layout Alignments Horizontal

 

This will give a pop up asking for the Geopak Alignment Startup Option. Select the GEOPAK 98 (Graphic Element Based) option, since we will be working with the graphic representation for the road.

 

This will bring up a small toolbar. Extend the top button (Click and drag it outside) to get the Horizontal Alignment Place toolbar.

 

 

Before drawing, change the current draw color to yellow and the line thickness to 4, like this:

  1. Click the left most icon to draw a straight line. This will define the starting point for your route.
  2. Use the increment option to create straight line or at an angle. Be sure that the lines are continuous (no gaps in the linework) from the start pt A to the end pt B.

 

 

 

 

 

 


  1. Use the Place Arc with Two Tangents at Given Radius button ( 4th from the right) to get the desired radius between the tangents.  It works exactly like the fillet command for MicroStation, but it also takes care of the trim simultaneously.

 

 

 

 

 

 


Now these lines or "graphics" should be stored in the GEOPAK database (GPK file) as a chain.

 

  1. Applications
  2. GEOPAK ROAD
  3. Geometry
  4. Store Graphics
  5. Enter Job Number - 1.
  6. Enter operator code - your initials
  7. Set the next option from Point to Chain.
  8. Enter the output chain name - "route"
  9. Enter the beginning point number as 1000
  10. Enter the beginning station as 10+00
  11. Click ID Element - Now if u notice at the status bar on MicroStation, it says Automatic Create Complex Chain > Identify element.  So u have to select the route that u just made.
  12. Click on the first line of your chain.  It should highlight.
  13. Continue left clicking in a blank area of the screen and GEOPAK will automatically select the next arc.  (If the next arc is not automatically highlighted you have not snapped correctly.  Delete the remaining portion of your route and redo it.)
  14. When your entire route has been selected, left click once more and the Store button will be available.
  15. Click the Store button
  16. A GEOPAK Store Graphics Notification box will appear asking you if you want to store the chain you have created. Select OK.
  17. You have now completed the horizontal alignment. Close all open menus.

 

 

Your route is now stored in your GPK file. If you delete or loose your DGN file, the chain is always available through the D&C Manager.  Also take a look at the new .inp file in your directory (use Notepad to open it).  It should be named j1oXX.inp where XX is your initials. As you can see the Store Graphics option is very useful in the design stages.

 

 

 

Now to display your route and stationing using the D&C Manager.

 

 

  1. Applications
  2. GEOPAK ROAD
  3. Design & Computation Manager – it will open a pop up box

 


 

  1. Go to Drafting Standards à Metric (XX+XX Stationing) à BL Baseline Horizontal Alignment
  2. This will make the Draw Plan & Profile option active in the pop up next to it.
  3. Click Draw Plan & Profile and that will open another pop up where u will have to select your job1.gpk and hit OK.
  4. In the Geopak Plan & Profile Draw window, set the Operation to Chains from Points.  The name of your chain should be listed under the Select Chain box.
  5. Check the options for Line Direction Label, Line Length Labels & Curve Data.
  6. Set the label scale to 200.
  7. Click the name of your chain ONCE to draw it.
  8. Change the Operation to Stationing.
  9. Click the name of your chain ONCE to draw stationing.
  10. Exit the D&C Manager.

 

Use the zoom tool bar to see the details.

 

When finished, close MicroStation and back up your files (road2.dgn, job1.gpk & j1oXX.inp where XX is your initials).

 

 

Assignment # 2

 

Complete assignment # 2 and submit it along with submission # 1 on the due date.

Posted on the website with the required information and materials to work with under the Assignment link.

 

 

 

 

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 Last updated: 1/24/2005