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Horizontal Alignment - COGO Data Entry OBJECTIVEThe goal of this lab is to introduce you to the data entry functions of GEOPAK. You will store an existing alignment using GEOPAK’s coordinate geometry (COGO) application. Coordinates, bearings, distances and curve data will be typed in and converted into a GEOPAK chain. ROUTE
CHAIN NAME:
"RCOGO" consists of: Y (Northing) X
(Easting) TAN1 From Point: 1500.000 1250.000 (5000) (Point
A) To Point: 1500.000 1367.957 (5001) CUR1 Radius: 818.511 TAN2 From Point: 1770.821 1976.230 (5002) To Point: 2212.417 2373.845 (5003) CUR2 Radius: 818.511 TAN3 From Point: 2473.161 2854.074 (5004) To Point: 2518.881 3142.737
(5005) CUR3 Radius: 1432.394 TAN4 From Point: 2668.911 3591.129
(5006) To Point: 2832.335 3898.485 (5007) CUR4 Radius: 1432.394 TAN5 From Point: 3000.000 4570.953
(5008) To Point: 3000.000 5750.000
(5009) (POINT B) STEPSCreate a new cogo.dgn
file based on the class seed file (sur4201seed.dgn). 1. Start
the GEOPAK Coordinate Geometry Application: §
Applications §
§
Geometry §
Coordinate Geometry
i.
Project Name: cogo
ii.
Job # 4
iii.
Operator Code: your initials
iv.
Subject: cogo
v.
OK
vi.
Hit Yes for any alert. 2. Store
points: §
Element à Point à Store §
Enter Point # (start with 5000) §
Check the Auto Increment Box §
Enter the Northing and Easting
for the point from above given data. §
Store Point §
Repeat until all from and to
points have been stored. (In all u should have 10 points, starting from 5000,
5001………5009) §
Close the Point > Store dialogue box. 3. Store
tangents: §
Element à Chain à Store à From
Elements §
Chain name: Tan# (Starting with Tan1) §
Change Begin Station to Station
As Is §
Under
Element Type select Point §
Point Name: Type in the points between which the
tangent falls. (for example: Tan1 lies between 5000 and 5001, so type 5000
first and hit Add, then type 5001 and hit Add) §
Store Chain §
Repeat until all tangents have been stored. (In all
you should have 5 tangents, starting from Tan1, Tan2…….Tan5) §
Close the Chain > Store > From Elements
dialogue box. 4. Store
curves: §
Element à Curve à Store à By End
Points §
Name: Cur# (Starting with Cur1) §
Enter the PC point# (To-point of back tangent) §
Enter the PT point# (From-point of ahead tangent) §
Change PI Point to Radius, and enter
the radius of the curve from above given data. §
Choose clockwise or counterclockwise
based on the direction of curve (look at the diagram) §
Store Curve §
Repeat until all curves have been stored. (In all u
should have 4 curves, starting from Cur1, Cur2…..Cur4) §
Close the Curve > Store > PC & PT 5. Join
elements into complete chain: §
Element à Chain à Store à From
Element §
Chain Name: RCOGO §
Change As Is to Begin Station and enter 10+00 §
Set the Element Type (which is Point
at present) to Chain and add TAN1 §
Now set the Element Type to Curve and
add CUR1 §
Continue adding all chains (tangents) and curves in
the proper order. (TAN1, CUR1, TAN2, CUR2, ……….TAN5) §
Store Chain §
Close the Chain > Store > From Elements
dialogue box. §
Save this session.
Go under File à File
Utility in the Coordinate Geometry window. §
Select Save §
Save As: Lab_7 §
Hit Apply §
Close the Coordinate Geometry window. 6. The new
alignment is now available in the D&C Manager. §
Application à §
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 job4.gpk and
hit OK. §
In the Geopak Plan & Profile Draw window,
set the Operation to Chains from Points. The name of your chain (RCOGO)
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 (RCOGO) ONCE
to draw it. §
Change the Operation to Stationing. §
Click the name of your chain (RCOGO) ONCE
to draw stationing. §
Exit the D&C Manager. §
Hit Fit View option to display your route. When finished, close MicroStation and backup your files (cogo.dgn, job4.gpk, j4oXX.jou & lab_74.iXX where XX is your initials). |
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