Learn how to build a corridor in Civil 3D using the assemblies that have been created, by navigating to the corridor dropdown in the home tab of the ribbon bar. This step-by-step guide demonstrates how to choose a name and layout, select alignments and profiles, and set baselines and region parameters for a corridor.
Key Insights
- Corridors in Civil 3D are created using assemblies, and the process starts by selecting the 'corridor' option in the home tab of the ribbon bar.
- Once the corridor is named and the layout defined, the next step is to choose the alignment and profile to work with. The available profiles change based on the selected alignment, as Civil 3D associates specific profiles with specific alignments.
- After setting the baseline and region parameters, Civil 3D allows you to set frequencies and targets. This process includes selecting the sides you want to target, and then deciding whether to mark the corridor as out of date or to rebuild it.
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Now that we have our assemblies created, we're going to go ahead and use those to create a corridor. So in order to do that, we're going to go ahead and navigate up to the corridor drop down in the home tab of the ribbon bar.
I'm going to go ahead and select corridor. And then from here, I'm going to go ahead and choose a name. The first one I'm going to be doing is my dev main alignment.
So I'm going to go ahead and type it in dev dash main. I'm not going to put it into description. I'm going to go ahead and leave my corridor style as basic and the C road core as my corridor layer.
My baseline type is going to be an alignment and profile because that's what we have created for this. We haven't discussed feature lines, but you can create corridors from feature lines. We're not going to do that in this class.
We're going to move down into here and choose which alignment we want to be working with. We want to be working with our dev main alignment. Then from there, we have our profile that we want to use.
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We're going to be going ahead and using our dev main profile because this Civ 202 surface profile is the profile along the surface for our alignment. So as you'll notice, if I change my alignment, the profiles available to me change. And that's because Civil 3D knows that certain profiles are associated with certain alignments.
So that's why we don't get a whole list of all the different profiles in the drawing. It's only the profiles that are associated with this specific alignment. So dev main, dev main prof. Then the assembly, I'm going to go ahead and choose dev because we're dealing with our development assemblies.
And then my target surface, I can set my target surface now, which Civil 3D will go ahead and target the surface for our cut and fill slopes. I'm going to go ahead and actually set it to none so that we can show how to set those targets. So I'm going to go ahead and then set my baseline and region parameters.
I'm going to go ahead and leave that as checked and click. Okay. Now that I've done that, Civil 3D opens up this baseline and region parameters window.
And so what I can do here is I can add baselines. So what baselines are is it's basically the zones that you're creating corridors inside of, then you can set frequencies. So how often you place an assembly to build that corridor off of, then you have the options for setting targets.
So what I'm going to go ahead and do is I'm going to click set targets. So inside of here, I have options for all the targets that are associated with the assembly that I've selected. So the assembly that I selected only had a cut and fill slope, a sub-assembly that had targets associated with it.
And that is the surface targets. If I had selected to choose my surface, when I created the corridor, this would autofill with whatever surface I had selected. But because I didn't do that, I have to come in here and click and select the surface I would like to use, and then click on the target surface, click on the surface I'd like to use.
So what I'm doing here is I am picking the sides that I want to target on. So the right-hand side will target this surface, the left-hand side will target this surface. So this is important, not necessarily for the surfaces, more so when we're dealing with width and slope, because on the right-hand side, you may have an alignment that you're trying to target that isn't present on the left-hand side, and you have a different alignment on the left-hand side that you're trying to target.
And so that's why you want to have a left and right target available to you. We're going to go ahead and click OK. I'm going to click Apply, and then Civil 3D asks you always, whenever you make a change to your corridor, whether or not you want to mark the corridor as out of date or whether or not you want to rebuild the corridor.
I'm going to go ahead and rebuild the corridor, and Civil 3D now places in my corridor in the drawing. I'm going to go ahead and click OK, and I'm going to zoom in and look at this. So what we can see here is that all of these lines that are crossing across our alignment, those are our assemblies being placed in to mimic this alignment.
Now, you'll see the corners don't look as great as you would expect them to look. They're kind of chunky. They're not doing a great job of approximating what this curve actually looks like, because what's happening here is that you're putting an alignment in, or an assembly in, and then drawing a line between the next assembly, and then drawing a line between the next assembly, drawing a line to the next assembly.
So every time it places assembly crossing this roadway, it's basically creating a shape in between those different pieces. So what this is going to do is if I go to this corridor, so if I navigate down to Corridors, go to DevMain, right-click, and select Properties. I can go to Parameters, which was the same parameters that we looked at for Baseline, Frequency, and Targets.
What I can go to is I can go to the region that we have, which is the only, we only have one region in this currently, and I'm going to go ahead and go to Frequencies and click on the ellipses. So inside of here, we have all of the different frequencies available to us. I'm going to go ahead and change my Horizontal Baseline Curve Increment to something like 5 feet, and hit OK, and hit Apply.
I'm going to rebuild the corridor, and then I'm going to hit OK again. And now you can see in these curves, because I'm placing them every 5 feet rather than every 25 feet, I'm getting a much better approximation of this curve. We're going to quickly walk through doing it again on the dev branch right now.
So I'm going to go ahead and go up to Corridor, select Corridor. I'm going to go ahead and change this Main to Branch. I'm going to leave all of this information the same.
I am going to change to Dev Branch. I'm going to go ahead and choose Dev Branch here. I am going to choose Assembly as Dev, and then I am going to set my Surface as Civ 202, but then I'm going to set Baseline and Regional Parameters and leave it checked.
Click OK. I'm going to go up into this Frequency here. I'm going to change my Curve Increment to 5. I'm going to go ahead and click OK, click Apply, click Rebuild, click OK, and now we have a corridor leading into here and a corridor leading along here.
Now, I'm going to save this drawing, and then I'll meet you in the next video where we'll deal with grip editing for these corridors.
