Create a corridor

00:06

In this drawing, we are going to create our first basic corridor.

00:09

While we are creating our first basic corridor, we are going to discuss baselines and regions that are associated with our corridor.

00:15

We are also going to discuss how to add additional regions, split regions, and merge regions together.

00:22

So to start with creating our corridor,

00:25

we're going to navigate to the Home tab of the ribbon bar and go to the Create Design area and dropdown in Corridors.

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We're going to select Corridor and when we select Corridor, Civil 3D is going to prompt us to specify the information for our new corridor.

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So I am going to call this corridor Dev-Cor.

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And I'm going to not describe it, I'm going to leave it as a basic corridor style.

00:48

If you wanted to define your style for your corridor, you can create a new one or edit them.

00:53

It's the same as all of the other styles that we've discussed inside of Civil 3D.

00:59

We can move on to our baseline type.

01:02

So our baseline type is either what we're used to expecting, which is an alignment and profile,

01:07

and we would specify the alignment that we want associated with our corridor and the profile we want associated with our corridor.

01:15

Or you can create a corridor without having an alignment and profile, you can just create a corridor based off of a feature line.

01:23

Because the feature line has horizontal and vertical data inside of it, you only have to use a single line.

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So if you wanted to create a corridor off of a feature line, you could select the Feature Line button, then you would dropdown,

01:36

select the site that your feature line is inside of, I know we have some feature lines inside of Grading.

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And then inside of your group that you've selected, inside of the site you've selected,

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you could dropdown and select the feature line you want to build a corridor off of.

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This would be a simple way to create a easy corridor, something that maybe had a straight grade and not very many vertical curves.

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But anytime you get into complex vertical curves, horizontal curvature and the like,

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you're probably going to want to go ahead and go with an alignment and profile.

02:09

It's much more robust design method than using feature lines.

02:14

So I'm going to jump back to alignment and profile, I'm going to choose Dev-Align and Dev-Prof,

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and I'm going to go ahead and go to my assemblies and choose Dev-No Target.

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Then I am going to go ahead and leave my set baseline and region parameters.

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We're going to talk about targets later, so I am not going to target anything, I'm not going to target any surfaces.

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And I'm going to go ahead and click "OK".

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So inside of this baseline and region parameters for our Dev-Cor, we can set baseline information,

02:44

we can set frequencies for how often we're going to place these corridor assemblies, and then we can set our targets inside of here.

02:53

We're just going to right now deal with baselines and we're going to have a single baseline and then multiple regions.

02:60

So what Civil 3D does is it categorizes these options inside of our baseline and region parameters as a hierarchical tree,

03:09

where we have baselines at the top and regions categorized underneath each individual baseline.

03:14

So what a baseline does is it specifies what horizontal alignment you're going to be on and what vertical profile you're going to be on.

03:24

And then everything underneath that is specified based on that information.

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Each region has its own specified assembly and so you can have multiple assemblies inside of one single baseline.

03:37

So inside of here, you can add additional baselines, you can set your frequencies, and you can set your targets.

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We're going to talk about baselines and adding regions to them now.

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So to add a region to a baseline, you can right click on the Baseline and select Add Region,

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and it will add a region down below inside of this baseline.

03:57

So it will choose a region name, you can choose the assembly you want to use.

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So if I want to use Dev-Target or Dev-No target, I could choose Dev-No Target and click "OK".

04:07

And then what you'll see here is that now I have two regions, I have a region going from 0 to 9+96.69', then I have a 9+96.69' to 9+96.69'.

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So what I would need to do is modify my baselines for creating a region that went from 0 to somewhere in the middle of my alignment,

04:26

and then from that same location at the end station of this region to the end of my alignment.

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Or you can also have a hole inside of your corridor for an additional baseline or an additional region that would use a different assembly.

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So what we're going to do now is I'm going to actually right click on this and remove region.

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And I'm going to hit "Apply" and build our first basic corridor.

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And so when I hit "Apply", Civil 3D is going to tell me to rebuild by corridor.

04:59

So I'm going to rebuild that corridor and I'm going to get some errors, and the errors I'm getting are because we haven't specified our targets yet.

05:05

So I'm going to go ahead and click "OK" and then check off on this window here.

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And what you'll see is we've created this new corridor.

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And if I go into Object Viewer, inside of my Object Viewer, you'll see that we have this roadway,

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and it does drop off because we probably went too far out and we don't have an elevation specified here.

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So what we can do is we can now use grip edits and slide this in.

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So I'm going to go ahead and slide this in here to this location right there.

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And then I am going to move my corridor up inside of my alignment back up into here.

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And the reason I'm doing this is because, like we could do in the baseline window,

05:54

we can also add and split and modify regions from this creation window up here from our regular CAD drafting window.

06:04

So if we have our corridor selected, we can go up into the modified region and we can split regions, add regions, and merge regions.

06:12

So what I'm going to go ahead and do is I am going to add a region.

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And Civil 3D is going to say, specify the region start station or fill.

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So if I start a region in this location here and I go all the way down to my end point for my alignment,

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and then I choose my Dev-No Target assembly and click "OK",

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what Civil 3D is going to do is it's going to kind of ask me if I want to start doing my target mapping.

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I'm going to just go ahead and click "OK'.

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I'll still get an error that I don't have my target set and I now have a hole.

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So what I could do now is Civil 3D is still prompting me to add additional regions.

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What I could do is, instead of a start station, I could specify a fill.

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And so if I hit "f" and hit "Enter", I can now fill in this hole that's here.

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And then I can set a different assembly type that I want to use or I can select my Dev-No Target again.

07:05

So If I go and select Dev-No Target and then I go in, it's going to ask me to set my targets for my surface.

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And I'm going to go ahead and not set that yet, and then we will go ahead and look at, now we have three regions,

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and if you are using the same information for all of your three regions, it's probably best to merge them.

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So If I wanted to merge all three of these regions together, I would choose merge regions and then it says select a region to merge into.

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So I'm going to merge into this region here and as I select a region to merge, I'm going to pick this region here and this region here,

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and Civil 3D is going to take all three of those regions and merge it into one single region.

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If for some reason I didn't want to have all those merged and I needed to have another gap,

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what I could do is I could also choose split region and I could split my regions again,

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and I could specify a region to split, and then I can specify my location to split the region at.

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And then what Civil 3D will do is now I have two regions split at the location I have defined.