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Horizontal
Alignment Design
OBJECTIVE
The goal of this lab is to design
an efficient horizontal alignment from point A to point B. 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 # 3
- 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 new road2.dgn
file based on the class seed file (sur4201seed.dgn). Reference 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 # 3, except that we
will be using some of the Geopak tools this time.
After getting the best baseline we
need to store the lines or graphics in the GEOPAK database (GPK) as a chain.
- Applications
- GEOPAK
ROAD
- Geometry
- Store Graphics
- Enter Job Number - 1.
- Enter operator code - your initials
- Set the next option from Point to Chain.
- Enter the output chain name - "route"
- Enter the beginning point number as 1000
- Enter the beginning station as 10+00
- Click ID Element - Now if you notice at the
status bar on MicroStation, it says Automatic Create Complex Chain
> Identify element. So you
have to select the route that u just made.
- Click on the first line of your chain. It should highlight.
- Continue left clicking in a blank area
of the screen and GEOPAK will automatically select the whole chain. (If the next arc is not
automatically highlighted you have not snapped correctly. Delete the remaining portion of your
route and redo it.)
- When your entire route has been selected, left
click once more and the Store button will be available.
- Click the Store button
- A GEOPAK Store Graphics Notification box will
appear asking you if you want to store the chain you have created.
Select OK.
- 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.
- Applications
- GEOPAK
ROAD
- Design & Computation Manager – it will
open a pop up box
- Go to Drafting Standards à
Metric (XX+XX Stationing) à BL
Baseline Horizontal Alignment
- This will make the Draw Plan & Profile
option active in the pop up next to it.
- Click Draw Plan & Profile and that will
open another pop up where u will have to select your job1.gpk
and hit OK.
- 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.
- Check the options for Line Direction Label,
Line Length Labels & Curve Data.
- Set the label scale to 200.
- Click the name of your chain ONCE to draw it.
- Change the Operation to Stationing.
- Click the name of your chain ONCE to draw
stationing.
- 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).
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