AutoCAD Civil 3D

[#1]

I have a simple road widening project and am having a difficult time trying to figure out which subassemblies to use. The design calls for widening the road on one side.  The widening vairies in width and is a constant 2% slope (away from the cl) across the new section, a vertical curb and then daylight to existing ground.  I have a main allignment defined at the cl of the existing road from which construction staking will be used, an alignment representing a sawcut at the inside edge of the widened section, an aligment at the outside edge of the widened section.  I have tried the OverlayWidenWithSuper1 without success, and have tried reading through the help but am finding it very confusing as there is no table of contents.

Can someone please help point me in the right direction?

Thanks

[#2 · Accepted solution]

If you are not matching the existing road cross fall then you can use an offset assembly with outside super set to 2%, curb a daylight attched.

attach the offset the the sawcut and the eop the widen line

[#3]

Joe's method will work but there is a potential pitfall to consider.  When you use an offset assembly the software treats that alignment and profile as a semi-independent baseline in the corridor.  This means that any corridor sections built from the offset baseline will be perpendicular to that alignment, not the road centerline.  Some people find that this is an issue if the sawcut line has bends and tapers in it.

Another method which can work is to add a generic LinkOffsetOnSurface from the centerline and target that to your sawcut line.  You can hide this link so that it's invisible in your sections later.  Attach the lane sub to that with a width target.

[#4]

Steve,

A few questions if you don't mind.

The offset alignment is not parallel to the centerline and also has tapers/bends.  Given this and what you are saying I assume the cross slope of the widened section will not be 2% when measured perpendicular to the centerline.  Is this correct?

How is it that you "hide" the link in the sections?

Thanks

[#5]

Joe,

This works just as expected.  Although I am leaning towards using Steve's method due to the offset alignment not being perpendicular to the centerline.

Any idea why the OverlayWidenWithSuper1 does not work in this situation?  Seems like an appropriate assembly name for the job.

Thanks

[#6]

Thats great!

One thing to consider: when the paving machine is following the sawcut line is the screed perpendicular to the centerline of the sawcut line?

[#7]

One thing to consider: when the paving machine is following the sawcut line is the screed perpendicular to the centerline of the sawcut line?

Yeah, for sure.  But that just makes for a more complicated design.  No?  I could get away with using your method but when it comes to labels being dynamic, it's much easier to produce consistent labels using the other method.  That translates into a much easier to check/read set of plans.

[#8]

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ACADuser wrote:

Given this and what you are saying I assume the cross slope of the widened section will not be 2% when measured perpendicular to the centerline.  Is this correct?

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Yes - with an offset assembly and baseline everything is relative to that baseline, so your design sections would be 2% measured perpendicular to the sawcut line at that location.

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ACADuser wrote:

How is it that you "hide" the link in the sections?

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Most of the generic link subassemblies have an option to "hide link" in the properties dialog.  Once that option is turned on the link disappears from the assembly and all corridors where it's used.

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ACADuser wrote:

Any idea why the OverlayWidenWithSuper1 does not work in this situation?  Seems like an appropriate assembly name for the job.

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OverlayWidenWithSuper would likely have been my default solution for this scenario.  You didn't elaborate on why you're having trouble with it, but I'm guessing that you're having difficulty with the targets required to make it work.  Try the link below to go directly to the help page for this sub.

http://docs.autodesk.com/CIV3D/2012/ENU/filesCSH/GUID-135FE114-5CAF-42A6-8CCD-C29225E5C29-94.htm

[#9]

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sboon wrote:

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OverlayWidenWithSuper would likely have been my default solution for this scenario.  You didn't elaborate on why you're having trouble with it, but I'm guessing that you're having difficulty with the targets required to make it work.  Try the link below to go directly to the help page for this sub.

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The issue I was having with the OverlayWidenWithSuper1 was not targeting, but rather the slope of the section was level rather than -2%.  The solution you provided works great, Thanks .