We are working on a road widenign scheme where one edge of the road is retained as far as possible while other edge being widened. I like to design a retained channel line by extending the cross fall between the existing centre line and the exiting channel line on to the design one.
It is possible in civil 3d to extend the gradient between two feature lines at some offset from reference feature line?
Mark Green
Working on Civil 3D in Canada
Thanks for the reply,
Yes the two features lines are roughly parallel at a distance of 7m. I like to create a new feature line at an offset of 10m from the first line and at the same grade as between them.Just to clarify more I have attached the PDF showing the problem in drawing. The existing grade G shown in the pdf is not constant instead varying.
Thanks
You can also select the feature line and go to the ribbon. Make sure the Edit Geometry panel is displayed and select the button for Stepped Offset. Provide the horiszontal offset and the %Grade,Slope,ElvDifferenece or elevation you require.
John Mayo
Mark Green
Working on Civil 3D in Canada
Mark Green
Working on Civil 3D in Canada
Yep. Didn't read the first post agian. Doing this manually as you said is the only way I see to extend the existing gradiant.
John Mayo
This can easily be done with a simple corridor and two generic links, by passing the link slope from the first link to the second link, then extract the corridor feature line.
How do you run a corridor down a featureline?
Maybe...
Create alignment from entity.
Project object to profile view.
Trace the featureline in profile view with a profile.
Few steps involved, but probably less work than my method, depending on the number of vertices involved. Also has the advantage of being dynamic (to the second featureline at least).
Mark Green
Working on Civil 3D in Canada
You don't need to. They can all just be Targets.
Thanks all for your genuine and prompt responses.Some of them are really good advises and will use in future for sure.
For the current project lengh of the road is quiet big and time is severly less so I took help from other road design software MX to design the grade extend line and then import it in to C3D which works quiet well.
Thanks again
"...so I took help from other road design software..'
Ouch!....just like running to the arms of another man..
hi everyone,
in case you are still interested
there are 2 subassemblies that could do the job (the official way)
check them out
OverlayWidenMatchSlope1
This subassembly overlays one side of an existing road, and adds one or more travel lanes to the edge while matching the existing lane slopes.
& OverlayWidenMatchSlope2
This subassembly overlays an existing uncrowned road, and adds one or more travel lanes to the left and right edges while matching the existing lane slope.
"The elevations of the Left and Right Insert Points on the Existing Surface are determined, and the slope is calculated between the two points"
This is what the OverlayWidem Subassembly does. you can set the overlay depth to 0 and only get the widen
Joe Bouza
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