SUR 4201L - Lab 3

 

 
 

In this lab you will design a horizontal alignment (centerline only) with MicroStation tools.  This design will later be integrated with the Geopak database. The alignment must meet the following criteria:

 

  • Minimum radius = 1000ft.
  • Minimum distance from baseline to any structure = 200ft
  • Minimum distance from baseline to wetlands = 500ft
  • Minimum distance from baseline to tract boundary = 400ft
  • Submit a baseline that meets the above specifications and minimizes the curvature, minimizes total delta, and minimizes total project length.

 

Steps

  • Create a working directory (c:\public\yourname_folder).
  • Download the lox.dgn and sur4201seed.dgn files to your directory.

 

Create a new file called "road1.dgn" and reference the lox.dgn file

  • Reference the lox.dgn file using File-Reference-Tools-Attach.
  • When finished, save your work and close the file.

 

Use the following MicroStation tools to design the centerline from point A to B. Stay clear of the buffered areas.  The alignment should be snapped to points A and B.  In addition all line & curve meeting points should be tangent. The final alignment must be continuous (no gaps in the linework).

Create multiple baselines and choose the best one that meets all the above mentioned criteria.

 

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

 

 

  Accudraw:  Turn on Accudraw to aid in the design process (like ortho-mode)

 

  Line:  Use the line tool to make the route.  Be sure that the lines are continuous (no gaps in the linework).

 

  Fillet:  Use the circular fillet with a specific radius to insert a curve at the two intersections.

 

  Trim: Use trim to remove unwanted arcs after the fillet command.

 

 

When finished, save your file and close MicroStation.

 

 

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 Last updated: 4/27/2005