Learn how to rectify discrepancies in elevation between cul-de-sacs and other alignments using inquiry tool and profile modifications. This article will guide you step-by-step on how to use the inquiry tool, make necessary modifications to your profiles, and ensure smooth transition between different points.
Key Insights
- The inquiry tool is crucial in fixing elevation discrepancies between cul-de-sacs and other corridors. It assists in determining the alignment station and offset point, which are necessary for further modifications.
- Profile modifications are often necessary after using the inquiry tool. The modifications include changing the grid view values to match the calculated elevations for the main and branch alignments.
- After making the necessary modifications, it's essential to rebuild the dev branch end and dev main end for the changes to take effect. This ensures a smooth transition between different points, eliminating unnecessary steps or anomalies.
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So in this video, we're going to take care of that little elevation bust that we saw between our cul-de-sac and our alignment or our other corridor. So to do that, what we're going to need to do is we're going to need to be using the inquiry tool, and then we're going to make some modifications to our profiles for the cul-de-sacs.
So what we're going to do here is I'm going to grab this corridor and I'm going to slide it back so that I can expose my alignment and so that I can access that inquiry tool on the ribbon bar. This is just the way that I like to do it. There's probably a different way that you could access the inquiry tool, but I'm going to go ahead and do it this way.
So the first thing I'm going to do is select my main alignment. I'm going to go ahead and go to the inquiry tool, and then I am going to drop down, make sure I have alignment station and offset point selected, and I'm going to get my dev main alignment. I'm going to go ahead and click okay.
Then I am going to snap to the beginning of my cul-de-sac. So I'm going to click there, and I'm going to make note that my station is 8 plus 54.4. I'm going to type this into a window off to the side so that I have it here. 8 plus 54.4. So I'm going to go ahead and move on and go to my other alignment.
So I'm going to go ahead and go to alignment station and offset point. I'm going to choose my dev branch and click okay. I'm going to navigate over to the dev branch.
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I'm going to snap to the beginning of my cul-de-sac, and I'm going to find out that it is 9 plus 36.31. I'm going to make note of it over on a separate window for 9 plus 36,9 plus 36.31. And now I'm going to go ahead and drop down and go to my profile. I'm going to select profile station and elevation at point. I'm going to choose the profile that I want to find out an elevation for, which is my dev main profile.
I'm going to go ahead and click okay. I'm going to scroll down here. I'm going to go into the station and I am going to type in my 8. Now if you're typing this in, you don't type in the plus because it'll do a math function for you.
So you're going to type in 854.4 and when you hit ENTER civil 3D will convert it to 8 plus 54.4. We're going to find out that that elevation is 194.428. So I'm going to make note of it over here as 194.428. And then I'm going to drop down and do the same thing again, profile station and elevation at point. I'm going to choose my dev branch proof. I'm going to go ahead and click okay.
I'm going to scroll down. I'm going to select my station and I am going to type in my 936.31. I'm going to hit ENTER civil 3D will convert it to 9 plus 36.31. And I have an elevation of 184.532. And so I'm going to make note of that over here in this window. And so the elevation differential that we're trying to calculate here is that we have an elevation here.
We need to translate it to a profile elevation here. I know that this is 17 feet from my alignment to this point here at a negative 2% slope. So I am going to calculate it as a negative 0.34. And so I've calculated these elevations for the main, I'm going to be aiming for 194.088. And for the branch alignment, I'm going to be aiming for 184.192. So what I'm going to go ahead and do is zoom out, navigate myself over to the profiles that I have for my end alignments.
I'm going to go to my dev main end profile. I'm going to go ahead and select my design profile. I'm going to go to my geometry editor, and I'm going to go to grid view.
So this 194.629 needs to get changed to 194.088. So I'm going to go 194.088. And then same thing here, 194.569 is going to change to 194.088. And then I'm going to make sure that I change this grade out to 2%. And then the grade in will be about 2%. So I'm going to go ahead and close this out, hit escape, close this out.
And I'm going to go up to this profile here, select it, I'm going to go to geometry editor, I'm going to go to grid view. And I'm going to change this 185.013 to 184.192. And I'm going to go ahead and change this 185.013 to 184.192. And then I'm going to go ahead and change this 3.15 to 2. And so now I've got 2 and negative 1.97. So I'm okay with that. I'm going to go ahead and close this out, close this out, escape away.
And so now when I zoom in here, these haven't been updated yet, I have to navigate over to tool space, go to prospector, open up corridors, and you're going to notice dev branch end and dev main end need to be updated. So I'm going to go ahead and click on dev branch end, right click, select rebuild, dev main end, right click, select rebuild. And so both of these have now been rebuilt.
I'm going to go ahead and take this corridor, stretch it back to the point where I want to be at, which is at the beginning of this corridor. And you'll notice now I have a nice clean transition between this point here and this point here. There's no more stepping out.
And if I was to view this in object viewer, you would see that they would mesh very well. So same thing here. I'm going to go ahead and click here, grab this grip, bring it to this point here.
And you'll notice that my grading now matches up perfectly. So I'm going to go ahead and zoom out, center this up, click save, and then I'll meet you in the next video.
