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rkmcswain
2011-07-19, 04:39 PM
We have a basic pavement section with constant cross slope.
On the low side, a ditch has already been designed - meaning that the horizontal and vertical locations are set.

See image below.

We can get the front and back slopes of the ditch to work, but not without having the front slope tie back to edge of pavement, which of course changes the slope because the center of ditch is not a constant distance from edge of pavement.

So I think the dilemma is ---- what subassembly can be used to define the yellow segment -and let *that* point vary based on where the two slopes intersect...?

TIA

Jeff_M
2011-07-20, 04:15 AM
Hopefully this pic explains it. It's done in 2012, so I could share the drawing if you are also using 2012.

bruce.klug
2011-07-20, 04:33 AM
Wow, that's scary. I did it exactly the same way!

rkmcswain
2011-07-20, 12:51 PM
Makes sense.... but I still don't get how to actually assemble it....

Starting with the lane.....Jeff you say to add the MarkPoint point *before* the LinkSlopesBetweenPoints --- if you do that, how did the MarkPoint end up on the other end of the LinkOffsetAndSlope? :Oops:

Jeff_M
2011-07-20, 01:36 PM
1. Add new Assembly
2. Add the 2 lanes, left & right
3. Add LinkOffsetAndSlope to the left lane, using any negative offset/slope as this is for layout mode only. The End of this link will be what you will be setting the ditch alignment & profile to target and will control the actual location.
4. Add the Link to surface or simple daylight for the outside ditch slope to the end of the LinkOffsetAndSlope.
5. Add a Marked Point to the end of the LinkOffsetAndSlope, give this a PointName of "Ditch"
6. Add the LinkSlopesBetweenPoints to the end of the left lane. Set these properties as follows....Marked Point Name = Ditch, Slope 1 = desired slope from edge of road, Slope 2 = desired ditch foreslope, Ditch width = 0.
7. Edit the LinkOffsetAndSLope sub to OmitLink.

Add the Assembly to the corridor region, set the Targets for the ditch alignment & profile and the Surface for daylight.

jtshumpert
2011-07-20, 01:46 PM
If there is anyway you could supply the drawing that would be great.
Thanks

Jeff_M
2011-07-20, 01:59 PM
Makes sense.... but I still don't get how to actually assemble it....

Starting with the lane.....Jeff you say to add the MarkPoint point *before* the LinkSlopesBetweenPoints --- if you do that, how did the MarkPoint end up on the other end of the LinkOffsetAndSlope? :Oops:
Note that *before* refers to the the Order in which you actually add the subs to the assembly, so that in the Assembly properties the Marked Point is shown 'above' the LinkSlopeBetweenPoints sub. If the Marked point is added after you add the LinkSlopeBetweenPoints, then it won't find the Marked point during calculations, since the Marked Point hasn't been calculated yet.

Jeff_M
2011-07-20, 02:04 PM
Here's the C3D2012 drawing demonstrating what I did.

jtshumpert
2011-07-20, 03:47 PM
PERFECT!:) Thanks

rkmcswain
2011-07-20, 05:59 PM
Jeff, I have not had time to get back on this problem, but I trust your steps will work....
I'll report back when the dust settles....

Thank you many times over! :beer:

SBOON
2011-07-21, 04:31 AM
It looks like Jeff solved this one before I even saw it.

Thanks.