topic Re: Intersection with different radius turnouts in Civil 3D Forum

Intersection with different radius turnouts

JD.Borgeson — Mon, 22 Aug 2022 15:57:21 GMT

Still green to Civil 3D. I've been asked to design a drive with turnouts of different radii, and I am wonder what the easiest way to do this would be in my case.

See photo: the east-west drive is existing; the new drive goes north from the existing drive, then turns west.

The goal with using Civil 3D for this is to get accurate cut and fill quantities. Am I better off trying to get this to work using assemblies and intersections? or just creating grading from feature lines?

Any resources on this would be appreciated. Thanks!

Re: Intersection with different radius turnouts

rpagan9L27H — Mon, 22 Aug 2022 19:06:57 GMT

Hello JD, I think a great benefit to using assemblies/corridors for earthwork is that you can eventually end up with a top and a datum surface. If you set the assemblies with the right thicknesses for the base, asphalt, etc., you can easily calculate cut/fill volumes discarding the road materials. If you create a surface with feature lines, you will need to manually calculate those quantities and subtract from the volume surface... I guess it all depends how accurate you need to be.

Re: Intersection with different radius turnouts

JD.Borgeson — Mon, 22 Aug 2022 19:27:21 GMT

I am not against using assemblies, but I do not currently know how to set turnouts with varying radii. I assume it is possible. But I haven't been successful in finding a tutorial or instructions.

Re: Intersection with different radius turnouts

rpagan9L27H — Mon, 22 Aug 2022 19:30:33 GMT

This is probably the best video on how to do this. Jeff Bartels for the win. https://youtu.be/EWT_SyzjUEA