draw a corridor in civil 3d
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Leveraging Corridors and Feature Lines Within Civil 3D
Over the by few releases of AutoCAD Civil 3D there has been a lot of emphasis on Corridor modeling, corridor modeling techniques and avant-garde modeling workflows. Much of this is considering of Department of Transportation's getting deeper into Civil 3D workflows and larger companies pushing for things to comport a sure way. But even for those doing "elementary" site plans and subdivision roads, Ceremonious 3D has a bully manner to increase your productivity and help streamline your workflows.
This article helps y'all walk through a couple scenarios of when you lot could perhaps utilise feature lines in your corridor modeling. If yous would similar the data used for this article, delight email me and I volition send the files.
NEW IN Civil 3D 2021
In addition to alignments and profiles, feature lines now can be used as corridor baselines. This alter was fabricated in 2018, I believe. Characteristic lines can also exist selected when creating the corridor and when adding baselines.
A parking lot is a adept case of where to apply this new workflow. When I pattern a parking lot, I typically design the border of pavement in order to see true slopes of cobblestone. I then use the stepped offset command to requite me menses line and/or back of curb elevations, and sometimes I may use grading objects to go on some level of dynamics. But now you lot tin can add together the feature line to a corridor along with a curb & gutter associates and have a much more dynamic and accurate surface.
An intersection is also a great example of using feature lines within your corridor model. Many people apply feature lines for intersections, but up until now information technology was more than of a manual process and not very dynamic. Extracting and targeting these characteristic lines is very simple and easy to use in corridor modeling.
The functionality of extracting feature lines, and keeping them dynamic, has been in Civil 3D for as long as I can call back. Yet, this functionality has now been enhanced with many new options. The options for selecting which feature lines to excerpt include:
- Extract all feature lines at once
- Select them i by 1
- Define Station Range
- Select a subset based on a corridor region or a simple polyline
By selecting a polyline, you will then be given the option on which characteristic lines to include/exclude for the extraction procedure. Select the settings pick to choose whether or not to dynamically link them to the corridor. You can choose to add them to a site, or now utilize the "Siteless" feature line options.
THE Associates
Nosotros will need to create an assembly for our adjourn & gutter. We will use this associates for both examples. This volition typically exist a elementary assembly and can even be a copy/modification of your corridors total assembly. Below is a screenshot of what I will exist using:
INTERSECTION WORKFLOW
Yes, nosotros could employ the intersection tool to create this, but sometimes that just does not accomplish what we want it to do. Sometimes you need but a flake more control, and characteristic lines volition allow you to exercise and so.
Let'south have a iv-fashion intersection for example. I showtime get-go with extracting the centerline feature lines as a dynamic link to either my contour or corridor. In this case I chose to use my FG profile as the feature to excerpt a feature line f rom (Nosotros will keep both crowns maintained).
ane. From the Habitation tab > Create Design panel > Feature Line drop-down > Create Feature Lines f rom Alignment
2. Select your alignment, then select the profile you wish to dynamically link to. You will then accept a dynamic feature line, therefore when your Alignment and/or Contour changes, your characteristic line does also.
iii. Create your feature lines along the Lip of Gutter (Edge of Asphalt) using either a polyline and create f rom objects control, or manually draw in your characteristic line.
4. Fix the grades as you lot would like along that characteristic line. For this example, I will assume you know how to do then.
The instance I am using would look something like this. The corridor has already been started, with gaps for the intersection area to be modeled.
Once we have our assembly created and our feature lines in place, nosotros are ready to begin modeling the intersection.
5. Select the Corridor, become into your Corridor Properties and select the Parameters tab.
6. From the Parameters tab, select ADD BASELINE. The Create Corridor Baseline dialog box will appear, select Characteristic LINE from the Baseline type.
7. Use the icon next to the Feature Line dropdown to select your feature line from the screen.Once selected, you may exist prompted to name the feature line, I chose to name mine NW Quad INT 1. Select OK.
8. The Baseline is at present added to your corridor and nosotros need to add the region and select the assembly.
9. Right click on the new baseline and select ADD REGION.
10. Choose your associates and select OK. Rebuild corridor if needed.
This will no put in the assembly along that characteristic line. And no need to do a stepped kickoff!! Pretty good so far, correct? Let's finish up the intersection quadrant by targeting our centerline feature lines for width and elevation. I utilize the contextual ribbon for some very useful shortcuts. Use these to really speed up your corridor modeling workflows!
11. Select your corridor from the screen.
12. From the contextual ribbon for said corridor, select EDIT TARGETS from the Alter Region panel.
13. Select within the region for the intersection.The Target Mapping dialog box volition appear.
14. We first will select the targets to set up our Width.Select NONE next to Width Target for the cobblestone portion.
xv. Set the object type to Characteristic LINES, SURVEY FIGURES AND POLYLINES.Then select both centerline feature lines from the screen.
16. Select OK.
17. Nosotros now need to select the same feature lines for the Outside Elevation Target. Select NONE next to Outside Height Target and follow the same steps as outlined nigh for setting width targets.
xviii. Select OK to exit the Target Mapping dialog box and Select OK to consummate the Corridor edits.
Echo all the about for each intersection. Remember to use your contextual ribbon to assist. In that location is a Friction match PARAMETERS command that is very helpful in this case. This will let you lot to fix similar targets without going through all the same steps.
Your resulting intersection should await something like this. You may need to reverse feature lines from fourth dimension to time as well, keep that in mind.
SITE/PARKING LOT WORKFLOW
This is a question I probably get at least in one case a month... "Should I apply corridors for parking lots?". Earlier now, in lodge to corridor a parking lot, y'all would end up with numerous alignments, profiles, assemblies, etc. And it merely was not worth the hassle of managing all that data, and a lot of times resulted in a lot of re-piece of work.
At present, for parking lots of any shape and size, y'all tin simply add together each feature line to the corridor as a baseline (not split up corridors) and apply the correct associates. You too get the extended data a corridor offers with dissimilar materials and surface, something that cannot easily be washed with only characteristic lines and stepped offsets. The workflows are practically the same as I outlined within the intersection example, so I volition not repeat everything, but a quick outline of this new workflow is below:
1. Add together features lines to corridor every bit a baseline and utilize the assembly.
2. Echo every bit needed for all curbing.
3. Subsequently the outset couple are in identify, create a surface f rom your corridor model for the finished grade.
4. Equally you add boosted baselines, you can see your parking lot take shape! You tin can allow the surface to tin f rom island to isle, or even target using an asphalt subassembly.
5. If the surface/corridor seems to be upside downwardly, you merely need to select the feature line and use the reverse tool f rom the contextual ribbon.
6. One common issue in corridor modeling is within and outside corners. Fugitive "bowties" and "non-mitered" issues have always been painful. Inspect some of the isle and parking areas to see how Civil 3D has now stock-still the majority of those issues!
Effort this on your next site design to really see the benefit of using corridors in this situation. I would love to see your concluding product!
CONCLUSION
In that location are many ways to model a corridor and corridor intersection. Some similar to create alignments and profiles, some like to use the intersection tool and modify f rom there and some only ignore the intersection (I have time to time). It was my endeavour to display a workflow that you may endeavour and meet if it fits your needs. So hopefully this gives y'all a little management to at least give the characteristic line as baseline a shot within your Corridor Modeling workflows.
Every bit ever, I am interested to hear what you call up and run into how we can improve upon this topic.
Good luck and Happy Modeling!!
Shawn has been a part of the blueprint engineering customs for roughly fifteen years in all aspects of blueprint, construction, and software implementations. He has implemented and trained companies across the Country on Civil 3D and other inf rastructure tools and their best exercise workflows. Shawn tin can be reached for comments or questions at sherring@prosoftnet.com.
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