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
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.
@Anonymous 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?
Joe Bouza
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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
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
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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.
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.
I agree with @Neilw_05.
Regardless of anything Autodesk might tells us, the Corridor Workflow is only intended for designing roadways with gentle curves. After all these are high speed roadways.
Any use beyond roadway design is outside the anticipated work flow and will require workarounds and compromises.
As suggested, I have used fillets as small as 0.001 ft. This means that using the fillet radius point is still accurate enough for construction layout. Working from outside in might help. Bowtie cleanup does not work variable width (targeted) subassemblies, so you may need to use multiple baselines.
Corridors are smarter than and a much more complete grading solutions than Feature Line grading and Grading Objects. Corridors can create a model with multiple materials, datum, surfaces etc. that can be used for quantity calculations. (This is as close as Civil 3D comes to BIM.)
Feature line grading and grading objects only provide simple surfaces.
Feature Line grading is tedious not dynamic.
Grading objects are dynamic, but seem to have a limited lifetime. (Blink and they are gone) Experienced users suggest detaching grading group surfaces and/or exploding grading objects and using the remaining feature line, before the grading objects corrupt the drawing and become unstable. Grading Objects are not a Civil 3D Point of Pride.
State Department of Transportation (DOT) adoption of Civil 3D seems to be major desire of Autodesk. This may bode well for those of us interested in Corridor improvement. Unfortunately, the DOTs work pretty much exclusively with roadways and gentle curves; DOTs are unlikely to drive the enhancements we want ,but we can always hope.
Christopher Stevens
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The sharp corners should be possible by treating each corner as an intersection, with the horizontal target being a line bisecting the corner. Vertical targeting shouldn't be needed.
@Anonymous, you might want to look at @sboons comment.
Adding an arc and single section at the center of the arc may be the first step to your solution.
As @sboon says you then need to edit the properties of that section. Your subassembly needs to have input parameters Berm-Inside-Slope, Berm-Top and Daylight-Slope. For a 90 degree corner, the bisector is at 45 degrees. Lengths along the bisector are 1.414 (See note 1.) times lengths perpendicular to the berm.
If the normal Berm-Inside-Slope is 2:1, edit the bisector section Berm-Inside-Slope to be 2.828:1
If the normal Berm-Top is 10 ft, edit the bisector section Berm-Top to be 14.14 ft
If the normal Daylight-Slope is 4:1, edit the bisector section Daylight-Slope to be 5.636:1
Editing the bisector section eliminates the chamfer. The edited parameters force the computed points to fall on the desired miter. Since there is only one section in the curve, the "arc" is tessellates as 2 straight lines. (See note 2.)
Notes:
Christopher Stevens
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@Anonymous, thanks for the very prompt reply! I will look this over later today.
Christopher Stevens
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I find the amount of work required to model mitered corners with corridors is excessive. Imagine doing this on a site with perhaps 100 corners!
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