Author Topic: Vertical cross section of a Tunnel pipe problem  (Read 6228 times)

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mjfarrell

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Re: Vertical cross section of a Tunnel pipe problem
« Reply #15 on: January 28, 2015, 07:40:23 AM »
I think you are 'over' thinking it....a 4 meter bore is still a 4 meter bore irrespective of the incline the boring machine is working at.

Also consider that no sharp changes in deflection either horizontal or vertical are going to happen.
This both so the boring machine can negotiate the turn AND the train cars.  Otherwise every subway in the world would be plugged up with stuck trains right now.
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Michael Farrell
http://primeservicesglobal.com/

mjfarrell

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Re: Vertical cross section of a Tunnel pipe problem
« Reply #16 on: January 28, 2015, 09:55:20 AM »
OK, I now see the issue. Much more clearly...

The cross section is projected perpendicular to the alignments with the controlling alignment being the Horizontal NOT the vertical alignment...and yes this distorts the

tunnel section. 

Good luck on any change to that coming from Autodesk.

Also I don't see any easy fix for this....However As stated earlier, on could resort to standard 3d solids EXTRUDE, or SWEEP command to model the tunnel and other features.

OR...and I have not tried this....Rotate the UCS and model this thing on it's side.....it may take a left and right version.
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Michael Farrell
http://primeservicesglobal.com/

ekoneo

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Re: Vertical cross section of a Tunnel pipe problem
« Reply #17 on: January 28, 2015, 10:24:09 AM »
Thanks mjfarrell.
It seems difficult :)
As a result of my internet researches, i read a little tip from autodesk forum.
http://forums.autodesk.com/t5/autocad-civil-3d-general/tunnel-corridor-becomes-shrink-on-very-high-vertical-slope/m-p/5485676#M266618

As BrianHailey said In SAC, there is a way to set the profile slope value to a parameter.
If it is possible to distort the subassemblies depending on that parameter, I can get correct result.
Unfortunatelly it seems complicated for me  :|
« Last Edit: January 28, 2015, 10:29:51 AM by ekoneo »

mjfarrell

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Re: Vertical cross section of a Tunnel pipe problem
« Reply #18 on: January 28, 2015, 10:49:15 AM »
one could do a similar thing by setting a target profile for the top of tunnel to follow...without SAC.
Be your Best


Michael Farrell
http://primeservicesglobal.com/