AutoCAD Civil 3D

[#1]

Hi

I have a Corridor issue - does anyone know how to fix the inside / outside corners of right angle corridor?

Im doing a embankment lift and the client wants the corners neatly and not curved or champers.

We often get a problem like, so help would be very nice! Also the outside corner should not curve. I can do it with gradings or futurelines, but if there is a design change i have to redo everything.

See the assembly - this is only the first lift.

Thanks

Riaan

[#2]

feature lines is the best way to do it atm, sorry it's not more dynamic.

[#3]

Assuming that your alignment is at the inside of the berm the solution here is to add a very small radius curve at the corner, then add a single corridor section at the midpoint of that curve.  You will have to use the corridor section view/editor to adjust the assembly parameters for this new section.

[#4]

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riaangroen wrote:

Hi

I have a Corridor issue - does anyone know how to fix the inside / outside corners of right angle corridor?

Im doing a embankment lift and the client wants the corners neatly and not curved or champers.

We often get a problem like, so help would be very nice! Also the outside corner should not curve. I can do it with gradings or futurelines, but if there is a design change i have to redo everything.

See the assembly - this is only the first lift.

Thanks

Riaan

---

So what kind of corner do you want?

[#5]

I think Riann wants the corners to be sharp corners with no chamfers or roundings.

As steve said, a very small arc with a frequency station at the centre.

Here is a step by step post

http://andrewscivil3dstuff.blogspot.com.au/2011/06/create-corridor-with-90-degree-bend.html

[#6]

hi Andrew

thanks for the blog - iv tried that before but does not quite work. It works well when the surface is close to the ground, but the higher you go, the more complicated it gets.

Iv attached two more pics, second try at the corridor.

The client wants a sharp outside / inside corner. I've tried the small radius, but as the lifts / raises progress, the bigger the arc gets on the outside.

The alignment starts fro the inside going outwards, I've also tried going from the outside going in, but then I end up with a bowtie effect.

This would be easier with offset polylines or gradings but there must be solution for this issue.

I still need to go up 10 lifts / raise, so the arc is going to be massive at the end.

Thanks

Riaan

Civil 3D

Intel(R) Xeon(R) CPU

X5675 @3.07GHz

64-bit

24GB RAM

[#7]

You will need to have an alignment to target for the outside that does not have an arc in it.

Offset your base alignment outward using the standard autocad offset command and then fillet the corner/s of the polyline with zero radius to remove the arcs. Create an alignment from polyline and use that as your outside target.

[#8]

You have encounted a fundamental weakness in Civil 3D: it cannot dynamically model projected mitered corners. You can't do it with with corridors, offset alignments or gradings. The best you can do is minimize the fillet or chamfer by getting as close as you can to the final solution with featurelines or alignments and using them as corridor targets or for gradings.