This is an issue I have been struggling with for a while. It is a bit difficult to explain, so I will do my best.
I need to add missing pieces of sidewalk on a milling and resurfacing project. I want to place the proposed sidewalk as close to the existing ground as possible .
I have my chain CLCONST that basically consists of a tangent a curve and another tangent.
I have my chain PR_BSW that is on the right side of the road (outside part of the curve). The offset distance between the CLCONST and PR_BSW is not the same throughout the entire length as we need to jog the SW around obstructions and connect to existing portions of sidewalk.
When I store the chain for PR_BSW, I begin the chain at the same station as CLCONST. Because of the jogs and the curve, the stationing does not remain the same. Below is an example. This was taken after the curve. You can see that the PR_BSW is now about 2.5 stations ahead of the CLCONST due to the jogs and increased distance around the curve.
I need to cut an existing ground along the PR_BSW and then create a profile for the back of sidewalk. If I do this using the stationing of PR_BSW, I am going to run into issue when I try to plot the SW in my XS.
I really need Geopak to cut my existing ground based on CLCONST while referencing the PR_BSW for the offset. Then I would be fine creating the proposed sidewalk profile along that existing ground. I basically want to do this:
The offset box must be a number, so I am out of luck there.
This is really my first project where I have had to add new sidewalk on a milling job of this scale. Perhaps I am going at this wrong, but any help in the matter would be greatly appreciated.
Thank you.
First a question... Are you running your cross sections using the FDOT criteria?
If so, in the situation as you've described, create an existing ground profile using the proposed sidewalk alignment. On the BSW line in the plan view, modify the adhocs Sidewalk Back Profile and Sidewalk PGL Chain to reflect the proposed sidewalk profile and alignment. The criteria will calculate the station of the proposed sidewalk alignment where it crosses the pattern line and use the correct stationing to get the elevation from the sidewalk profile. Does this make sense? If not, please feel free to contact me directly.
If you are not using our criteria and using Corridor Modeling, I will get someone else to answer your question on the best way to approach this situation.