First of all I want to wish all our readers the best for 2013. I hope you all have a fantastic year!!
I received many requests for my Tunnel Subassembly that I have been using during the Bridge/Tunnel Webinar in December last year.
Here it is…
The Tunnel subassembly can be downloaded at the bottom of this post but before you can start using it, I need to explain how it is to be used.
The geometry of the tunnel subassembly contains different parts for the floor, walls and roof of the tunnel. I also have added leveling concrete (to fill gaps caused by the superelevation of the road model) and barriers on each side.
This becomes handy if you need to define separate volumes for each part of the tunnel model.
The subassembly is designed to be used in an undivided crowned road model, which means that it has only one slope value for the right side and one slope value for the left side of the centerline. Medians are not supported.
Since the road that goes through the tunnel can have a varying slope (Supperelevation is applied) and width (Widening is applied) I built in targets for both offset and elevation for the left and right lane. The target lines are the Edge of Pavement lines for the lanes.
The width of the tunnel depends on the offset targets. In Layout view, it will have a fixed width of 20 meter.
Besides the targets, I have added some input variables to support as many situations as possible.
Road Slope is the default slope of the road when no superelevation is applied. This is mainly done for representation in the subassembly view or when no targets are defined.
Road depth is the depth of the road model, which is the depth prom the centerline to the bottom/datum of the road package, this value indicates where the leveling concrete needs to begin.
All other values are tunnel size parameters.