i have asked this in the past, but in my company it is a re occuring situation that i haven't been able to work out to everyones satisfaction. so i am asking for thoughts on this situation. for the record, i am using c3d 12. what i do is alot of road reahab. we have to match the width of the existing road because of all the driveways, which are anything from concrete aprons to very expensive paver installations. the other problem we have is the road itself does not have more than 1-2 ft difference in elevation. so, due to the elevation issue, we are currently doing plan and profile, by that, i have left and right edge of pavements and a centerline profile, all on one sheet so we can actually see the grades at the driveways for puddling issues. all that work so far is not too big a deal. what is, is when we have a curve. the problem i have is that if i have 3 alignments going into the cuve, the inner curve alignment and outer curve alignment is different because of the curve lengths. to fix this, i have been using the super imposed profile into copied centerline profile view and adjusting all the information so that it is using the correct surface.
what i would like to know is if anyone else is doing the rehab and using multiple profiles? and if so, what is their proceedure. or if anyone else is doing something similar with the profiles. i am hoping someone would be kind enough that if they do rehab work, they could post me a couple pdfs of what they look like? i really need to show what others are doing regarding this kind of work.
California and some other jurisdictions have a standard for a "three line profie" which sounds like what you need. Essentially you have a centerline profile in the middle of the page with existing and design elevations, a left side profile at the top of the sheet and a right side at the bottom. There is an old post here talking about them. A Google search might find more info, or someone else may be able to post an example of what they look like.
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Well you are likely controlling your project from a baseline, most commonly a centerline. That is industry standard. If you need to incorporate vertical curves in your profiles, you don't want them to be applied at the edges of the roadway because that would require different curve lengths for inside vs. outside edges of the road through curves due to the difference in lengths to the tangent points.
I would agree that you need to translate those tangent point elevations to the centerline.
I do alot of work like this too and have come to designing my edges as their own alignments and profiles and add expressionsions that reference the baseline stationing.
thats exactly what i have been doing. my process was to create alignments along the edge of pavement and creating a profile. so i have 3, alignments and profiles. then off to the side, i would copy the profile view from the centerline and super impose the edge of pavement information in that profile view. correct the bands to represent the correct profile information. the problem lies iwth the curves, and being radial to the centerline for stationing. what i need is to be able to exagerate the lengths of the grid lines to make them longer or shorter.
i have even gone on some jobs with making multile alignments. starting at the begining to the pc. then starting the algnments for the curves, then new alignments at the pt's for the rest of the lines and have tme match the centerline pt stationing so they match. i make sure to put my matchlines for the sheets so the curve is by itself an the tangents are on their own sheets. when i do the curves, i have the stationing for the centerline, but hte bands stationing are removed for the edge of pavemednts so that there is no mistake. it is an aweful lot of work.
how do you get around the issue of the curves though? or are most of your roads fairly straight? i have done it multiple ways as i said in previous posts and i can not seem to please everyone.
I think you'll have to consider the standards for 3 line profiles in your area. What is common there?
i have not seen anyone else doing this in our area, thats the problem. as someone posted above, i guess arizona and california require it. i looked for sample plans to see if some thing is shown but i couldnt find anythng. joe is correct, as he stated its compressed or expanded, but the program wont allow that as far a i know. thats why i was asking if anyone else does this and for a sample on how to draft it.