Sweep problem

I know this problem is all over this discussion board but I have not had any luck with some of the solutions.

I have a tunnel profile that I need to sweep around a path. This path is a 3D Polyline but it has arcs and slope associated with it. The sweep command has this automatic banking or twisting to it that just screws everything up. The profile needs to stay perpendicular to the path and the floor of this tunnel needs to remain flat.

I have attached the actual working drawing. It has the profile (which is a simple typical tunnel) and the path all situated if any of you can figure it out I  would greatly appreciate it!!

I'm working in AutoCAD 2012 if that really matters.

Thanks,

Dave

AutoCAD® 2013 Certified Professional

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