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Replace mid-Alignment curve

7 REPLIES 7
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Message 1 of 8
AllenJessup
1405 Views, 7 Replies

Replace mid-Alignment curve

Late in the game the Engineer wants to replace one long curve with three compound curves. In order to delete that free curve I have to delete [delete sub-entity] the curve and tangent preceding it and the tangent and curve following it.

 

I have the new portion of the alignment drawn with lines and arcs. Using "Convert Autocad Lines and Arcs" will add those entities to the alignment. But the stationing skips that area and the profile stops at the first PC. I can create the alignment from scratch. But then I lose the finished ground in the profile and everything that is based on that.

 

Do I have to start from scratch building the alignment, creating a profile and the finished grade, etc. Or am I missing a step that will add the new entities mid-alignment?

 

Allen Jessup, Rockland County Highway Department
Windows XP Pro, SP3
Dell Precision T7400, Xenon X5460, 3.2 GHz, 4 (3.25) GB Ram
NVIDIA Quadro FX 4600, 768MB, driver Ver 6.14.0011. 9178
Powerdraft OpenGL drivers Ver 17.2.2
C3D-SP2.1 (Version 3.1), LDTC & RD 2009



Allen Jessup
Engineering Specialist / CAD Manager

7 REPLIES 7
Message 2 of 8
Jeff_M
in reply to: AllenJessup

Make sure the lines & arcs are drawn in the same direction as the alignment (down station to up station), and add them in the exact order (down to up). You may need to add each one separately. 

 

If that doesn't work, draw the tangents out to the PI's, add them to the alignment, then use the alignment tools to create the curves.

 

One of these should work so you do not have to recreate the entire alignment.

Jeff_M, also a frequent Swamper
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Message 3 of 8
Joe-Bouza
in reply to: AllenJessup

Hi Allen, I've adopted a not by entity policy for the very reason problem you are having. With a little practice (really not that long) the alignment tool bar is very powerful. Can you send me the file to look at?

 

Joe

Thank you

Joseph D. Bouza, P.E. (one of 'THOSE' People)

HP Z210 Workstation
Intel Xeon CPU E31240 @ 3.30 Hz
12 GB Ram


Note: Its all Resistentialism, so keep calm and carry on

64 Bit Win10 OS
Message 4 of 8
AllenJessup
in reply to: Joe-Bouza

Hi Joe.

 

The add entity didn't work even after I redrew them. I'm trying Jeff's second suggesting now. If that fails I'll send you the file.

 

Thanks

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 5 of 8
AllenJessup
in reply to: AllenJessup

The only way I managed this was to reduce the large curve to tangents, delete the tangents, draw Floating curves from the inbound and outbound tangents through points marked from the individual entities and then connect those 2 curves with a Free curve between them.

 

This creates the curve correctly but I'd be much happier if I could use 3 free curves. I would rather be able to define all the curves from tangents and radii than rely on a graphic point.

 

Thanks to all for you suggestions. They lead me in the right direction.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 6 of 8
Joe-Bouza
in reply to: AllenJessup

Sure thing.

Thank you

Joseph D. Bouza, P.E. (one of 'THOSE' People)

HP Z210 Workstation
Intel Xeon CPU E31240 @ 3.30 Hz
12 GB Ram


Note: Its all Resistentialism, so keep calm and carry on

64 Bit Win10 OS
Message 7 of 8
jmayo-EE
in reply to: Joe-Bouza

I get it to work similar to the way Jeff does. I delete the curve and then instead of adding new tangents to the PI, I use the apprent intersection snap to drag the first tangent to the PI & then snap the second. If the stationing gets broken, the alignment segs are not joined perfectly. If you can't add a curve to the new tangent extentions, delete the new PI's & give it a shot.

 

John

John Mayo

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Message 8 of 8
AllenJessup
in reply to: jmayo-EE

I think that I was having a problem because I was replacing one curve with one PI with three curve with 3 PI's. Since the original curve was a Free curve when I deleted it I was left with 2 tangents out to the PI. I deleted those and snapped the inbound and outbound tangents to the new PC and PT.

 

I was first trying to construct the new tangents and then insert Free curves between. That would give me a Tangent, tangent, radius solution. One thing I missed is that the 2 end curves have to be Floating in order to attach a Free curve between them. I discounted that at first because I had all the tangents. But once you create one of the compound curves as Free you can no longer use that to attach another free curve. Once I created it Floating, Free, Floating. It worked.

 

I was being lazy using the entities. I had them there because I had plotted out 5 different choices for our Engineer. Since this is a rehab/realign project we wanted to miss some trees on the right near the middle of the curve but stay within the ROW on the left at the end of the curve. Breaking it into a compound curve was the only way to do that without taking more ROW than we planned. I'll attach the plot of the revisions that were chosen.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

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