Civil 3D intersection

[MShoesmith]

Hello all

We have created an assembly which is a concrete trapezoidal shaped channel.

It has a flat base with a 1:2 slopes and a toe/berm.

We have created a corridor of this assembly on 2 alignments.

One of the alignments (the minor) merges with the major alignment.

The minor merges with a curve onto the major which is a tangent.

We need to create a intersection here.

We have used the intersection wizard but are struggling.

The wizard intersection is for road intersections but can it be used for our type of assembly at non-road junctions?

Is there an alternative?

Currently, we have split the corridor and removed regions around the intersection.

We have copied featurelines from the corridors and used these to create a surface around the intersection.

Not ideal but only way we can progress.

Any advice is appreciated.

Best regards

Shoey

[mathewkol]

Which subassembly(ies) are you using to define the channel?

[Neilw_05]

You say you are struggling with the wizard. What is the problem you are having?

It should be possible to use the wizard if the side ditch has radii where it meets the main ditch. Perhaps a screen capture showing your geometry would help.

[sboon]

Do the inside corners of the intersection meet with curves, or miters?

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[sboon]

OK I think I have a solution that works for both types of corners.  I started out with a standard intersection, using offset and curb return alignments.  I then edited the parameters for one of the curb returns to a chamfer type with very small lengths so that it acts like a simple PI.

I rebuilt the corridor region so that I could see where the daylights crossed and then drew a featureline from the bottom intersection to the top.  I modified the assembly for the curb returns to add conditional subs.  If the featureline is located then the corridor targets that horizontally and vertically.  If the FL is not found then it daylights normally.

The results.

[MShoesmith]

All

Many thanks for your replies. Appreciate your time.

Attached is snapshot of the scenario.

The left viewport shows the paln where the triangualted surface are the corridor regions.

The top right viewport is the assembly using the basic 'Shape trapezoidal' assembly fo the base, slopes and top.

Daylight General has been used for the daylight.

Bottom viewport shows the intersection in a 3D view.

I have only started to use C3D very recently so just cutting my teeth!

Regards

Shoey

[Neilw_05]

That mitered corner is a problem for the wizard and for corridors in general. I think you'll need to use something like Steve's idea.

[sboon]

Your scenario is more complex than mine because you'll have to deal with the miter joint across multiple subassemblies.  You'll need a curb assembly that has only the trench sidewall on the right for the section where that is the miter, then another one that includes the top of the berm, and a third one for with the daylight sub.  One advantage for you is that the first two assemblies are only used in locations where the featureline exists, so you don't need a conditional test for them.

Where I only had one corridor region for the mitered corner you are going to have five of them:

• Miter joint at the daylight sub.
• Miter joint at the berm top
• Miter at the trench sidewall, from both sides
• Miter at the berm top from the other leg of the intersection.
• Miter at the daylight.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[MShoesmith]

Thanks for your replies.

Steve - Can i please clarify with your goodself.

I need to create 5 assemblys as you suggest and apply these using the intersection wizard?

Or do you mean create 5 regions for the corridor in the area of the intersection and not use the intersection wizard?

Thanks

Shoey

[sboon]

Three assemblies and five regions.  The intersection wizard is not going to be able to deal with this one, so you're editing the corridor manually.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate