Hi,
I am trying to create a closed loop alignment for a track. Previously i have included a small gap between two alignments to get around the problem when a housing plot is created (please see the attached dicument) when a closed alignment is created, Is there any way of getting rid of this?Or am i doing something wrong.
P.S i am still beginner at using autocad civil 3d
@Anonymous.woodward wrote:
Is there any way of getting rid of this?
I'm not quite sure what you are asking about. Also, please don't post DOC files, many people won't open them due to possibility of embedded virus. Instead, just attach the image direct.
Apologies. Here is the attached Jpeg.
Basically, the issue is that i do not want to create a parcel or plot. I have got a cirucit track , which a a closed loop and designed using alignment. But whenever the end chainage is conencted to 0 chaiange it creates a parcel from which creating a corridor is not possible (well this is what i think) if there is any way of resolving this issue it would be much apreicated.
I you open C3D and get the issue to display on screen, hit the Print Screen button. Open Microsoft Paint and paste the screen cap into Paint. Save it as a png and post that file.
John Mayo
I think C3D is going to create the parcel no matter what you do since it is closing. You can change the parcel to a no-display style though.
I'm not sure waht ADesk recommends with closed alignments. Personally I get the heebie-jeebies jsut thinking about them. Anyone else use closed alignments?
John Mayo
I created it successfully, closed, WITHOUT it creating a parcel.
a siteless alignment would not be able to create a parcel since a parcel requires a site.
Change the alignment to siteless.
Agreed!
Do you folks use closed alignments often? Is the fear all in my head? 🙂
John Mayo
I did try this option as well but the problem arises when you start building a corridor. The assembly acts as if it is created of the area created inside the lopp for some reason. Any suggestions on this.
Like i said before i always leave a small gap in my straights to overcome this issue before but this may be a wrong method of doing this.
P.s Thanks for your replies.
Karen,
given the geometry of the alignment, i would suggest splitting the alignment into two alignments which share endpoints on either end. This should clear up the problem nicely.
My earlier response was only to prevent the program from assigning the parcel style to the area inside the alignment.
As others have said, it's primarily a site issue (not the corridor, the parcel being created). I wrote up a blog post about this that might help: http://civil3dplus.wordpress.com/2010/09/06/when-a-site-isnt-a-site/
Brain,
Thanks for this i did use this option as well before but like you said on your blog there is no interaction between the two alingments. I have resolved this issues with following
1) As dan suggested use two alignments but with a breakline in the straights very minute distance which may be ignored and use the featureline to close the loop
2) Create a surface from half the alignment and use this as the new existing surface.
Will have to see if there is any another way. The problem is for people designing new closed loop raodway/tracks. :(.
I thought you said you didn't want the alignments to interact with each other. The ONLY thing that putting an alignment in a site does for you is it allows that alignment to be used as a parcel segment. Nothing else. Zip. Zero. Nada. If you want them to define parcels, put them in a site. If you don't want them to define parcels, don't put them in a site.
Oh, and sorry about the image, I just heard the Guns-n-Roses song on the radio the other day and that quote has been stuck in my head.