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Coridors: Daylight Slope transitions?

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Message 1 of 6
randoshadow
3245 Views, 5 Replies

Coridors: Daylight Slope transitions?

I have a basic roadway that has 4 to 1 cut slopes and there is an area I need to transition to 2 to 1 due to restrictions.

Do I have to create two separate assemblies, one for the 4:1 and one for the 2:1 or can I define in the corridor regions what slopes to use (kinda like LDT did)

I also need to know if there is a way to define the slope transition. I need to have the slope transition from 4:1 to 2:1 over 200ft. Is there a daylight sub assembly that can do this or will I have to edit my corridor sections manually like I have been doing?

Thanks,
Randy
Civil 3D 2009 64bit
5 REPLIES 5
Message 2 of 6

I'd take a look at the DaylightInsideROW subassembly. You should be able to create a polyline representing the area you can't disturb and the subassembly won't cross the polyline.

Christopher
http://blog.civil3dreminders.com/
Civil Reminders
http://blog.civil3dreminders.com/
http://www.CivilReminders.com/
Alumni
Message 3 of 6
BrianHailey
in reply to: randoshadow

You could also use a grading instead of the daylighting. You can define the area that's 4:1, the area that's 2:1, and then transition between them.

Brian Hailey
http://www.cad-1.com
http://www.AtYourDeskTraining.com
http://Civil3DPlus.wordpress.com

Brian J. Hailey, P.E.



GEI Consultants
My Civil 3D Blog

Message 4 of 6
Anonymous
in reply to: randoshadow

Set up your corridor for 2:1. View-Edit the corridor at the first station
at 2:1. Use the parameter editor to change the slopes. Use the Apply to
Station Range tool to apply the 2:1 for the range. Rebuild the corridor.

--
Matt Kolberg
Global CADD Systems - A division of Cansel

"randoshadow" wrote in message news:6340537@discussion.autodesk.com...
> I have a basic roadway that has 4 to 1 cut slopes and there is an area I
> need to transition to 2 to 1 due to restrictions.
>
> Do I have to create two separate assemblies, one for the 4:1 and one for
> the 2:1 or can I define in the corridor regions what slopes to use (kinda
> like LDT did)
>
> I also need to know if there is a way to define the slope transition. I
> need to have the slope transition from 4:1 to 2:1 over 200ft. Is there a
> daylight sub assembly that can do this or will I have to edit my corridor
> sections manually like I have been doing?
>
> Thanks,
> Randy
> Civil 3D 2009 64bit
Message 5 of 6
miketuter
in reply to: Anonymous

How does that address the transition part?

Message 6 of 6

Wow old thread... but still a major problem in Civil 3D.

 

You can't really transition in a way that is simple, like 12d, LDT, MX etc.

 

You can change the slope easily, but not transition easily! I.E Cubic, Linear transition etc.

 

A few methods you can use include the following.

 

  1. Use the superelevation editor. Click on the subassembly that you want to transition (The Daylight) and select a super elevation mode say "Left Outside Lane".

    Then select your corridor and add a superelevation view

    Then go through the cumbersome tabular editor to populatd the grades on the graph.Should look like so.

    daylighttransition.png

    The finished results looks a little like so, which is somewhat alright, but still not nice, as the transition is linear. And we get jagged edges on the contours.

    daylighttransition-2.png

  2. Use the Override Stations Method. 

    Select the corridor and go to the section editor
    daylighttrans-1.png

    Select the Parameters Editor and modify the grade.
    daylighttrans-2.png

    Then apply to the station range I want.
    daylighttrans-3.png

    Still only gets me halfway there, as there is no transition options!!, the only way to force the transition from here is to change the sampling on the corridor reducing the quality of the transition anyway!
    daylighttrans-4.png

  3. Do It manually by working out the location on the surface you need to widen to. But that is just not realistic!

  4. Use a fixed link and link the grade in the fixed link to the daylight link. Also horribly cumbersome.but gets the best result.

    Draw a Profile that represent grade so (elevation of 0.4 = 40% etc.)
    daytansmeth2-2.png

    Add a link with elevation target to your assembly like vertical elevation. Make sure it is added before your daylight link or this wont work
    daytansmeth2-1.png

    Next Select your Assemlbly go to its properties and select the contruction tab, you need to link your daylights slope to your fake links elevation
    daytansmeth2-3.png

    Finally target the elevation profile with your new elevation link and watch the magic happen.
    daytansmeth2-4.png

    Looks the best, and it is dynamic, but extremely infuritating to setup.
    daytansmeth2-5.png

    Sorry for long post.

Kapanther

Civil 3D 2021 (Update 1), ACAD (SP1.3) MAP (HF0.4)
Infraworks 2021.1,
Win 10 -DELL Precision Notebook 7730

ceethreedee.com

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