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Transitioning Question - maintain a grade

5 REPLIES 5
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Message 1 of 6
Anonymous
170 Views, 5 Replies

Transitioning Question - maintain a grade

I have a corridor, basically it is a simple road, on each side of the road
is a ditch- 3m over 1m down, then a flow line of 1m width.

On one side of this road, I want the flowline of the ditch to be a constant
grade of 1%.

What I've done.

I have my CL alignment
I have my FG CL profile
I have two assemblies, one standard with a ditch on each side that will
follow the road grade, the other has a ditch on the right that follows the
road grade, and then the ditch on the left, which will run at 1%. For lack
of better subassemblies, I used transition lane to get down to the default
3m left, 1m down position.

I created a ditchbottom profile (on the CL alignment) to define the flowline
of this 1m ditch.
I created 3 regions, the middle region will be the 1% section.
for that middle region, I attached the ditchbottom profile for my
transition.
the subassembly is set to "hold grade, change offset" my assumption by using
this, is that it will maintain my 1:3 slope and change how far offset it is
from the centerline based upon the bottomditch profile.

All this is not working.

Do I need to create another alignment for the 1% flowline? Any help would
be appreciated.


--
----
Sorry, nothing snappy here to say.
5 REPLIES 5
Message 2 of 6
Anonymous
in reply to: Anonymous

a picture is worth a thousand words, so a screen capture might help me here,
but my gut feeling is yes, you would need an alignment for your 1%



--
Dana Breig Probert, E.I.T.
Engineered Efficiency, Inc.
www.civil3d.com
www.eng-eff.com
----------------------------------
Civil 3D 2007 SP2
AMD Athlon 64 X2 Dual Core 2.01 GHz
2GB RAM, 256 MB ATI FireGL V5200
-------------------------------------------
"Ron Mills" wrote in message
news:5341202@discussion.autodesk.com...
I have a corridor, basically it is a simple road, on each side of the road
is a ditch- 3m over 1m down, then a flow line of 1m width.

On one side of this road, I want the flowline of the ditch to be a constant
grade of 1%.

What I've done.

I have my CL alignment
I have my FG CL profile
I have two assemblies, one standard with a ditch on each side that will
follow the road grade, the other has a ditch on the right that follows the
road grade, and then the ditch on the left, which will run at 1%. For lack
of better subassemblies, I used transition lane to get down to the default
3m left, 1m down position.

I created a ditchbottom profile (on the CL alignment) to define the flowline
of this 1m ditch.
I created 3 regions, the middle region will be the 1% section.
for that middle region, I attached the ditchbottom profile for my
transition.
the subassembly is set to "hold grade, change offset" my assumption by using
this, is that it will maintain my 1:3 slope and change how far offset it is
from the centerline based upon the bottomditch profile.

All this is not working.

Do I need to create another alignment for the 1% flowline? Any help would
be appreciated.


--
----
Sorry, nothing snappy here to say.
Message 3 of 6
Anonymous
in reply to: Anonymous

I did end up creating an alignment. I just think it's wierd, that you can't
define a profile off the main alignment, and have the transition follow on
grade to the secondary elevation. Now you have to design the secondary
ditch alignment, instead of letting C3D do it for you. It would actually be
very simple.

--
----
Sorry, nothing snappy here to say.
"Dana Breig Probert" wrote in message
news:5343544@discussion.autodesk.com...
a picture is worth a thousand words, so a screen capture might help me here,
but my gut feeling is yes, you would need an alignment for your 1%



--
Dana Breig Probert, E.I.T.
Engineered Efficiency, Inc.
www.civil3d.com
www.eng-eff.com
----------------------------------
Civil 3D 2007 SP2
AMD Athlon 64 X2 Dual Core 2.01 GHz
2GB RAM, 256 MB ATI FireGL V5200
-------------------------------------------
"Ron Mills" wrote in message
news:5341202@discussion.autodesk.com...
I have a corridor, basically it is a simple road, on each side of the road
is a ditch- 3m over 1m down, then a flow line of 1m width.

On one side of this road, I want the flowline of the ditch to be a constant
grade of 1%.

What I've done.

I have my CL alignment
I have my FG CL profile
I have two assemblies, one standard with a ditch on each side that will
follow the road grade, the other has a ditch on the right that follows the
road grade, and then the ditch on the left, which will run at 1%. For lack
of better subassemblies, I used transition lane to get down to the default
3m left, 1m down position.

I created a ditchbottom profile (on the CL alignment) to define the flowline
of this 1m ditch.
I created 3 regions, the middle region will be the 1% section.
for that middle region, I attached the ditchbottom profile for my
transition.
the subassembly is set to "hold grade, change offset" my assumption by using
this, is that it will maintain my 1:3 slope and change how far offset it is
from the centerline based upon the bottomditch profile.

All this is not working.

Do I need to create another alignment for the 1% flowline? Any help would
be appreciated.


--
----
Sorry, nothing snappy here to say.
Message 4 of 6
kcobabe
in reply to: Anonymous

Why don't you just create a feature line where you want the 1% flowline then grade off of that to the surface.

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Message 5 of 6
Anonymous
in reply to: Anonymous

But that's the whole point. I didn't want to have to figure that. C3D I
would have thought, would have been to carry a slope out to an elevation as
defined as a secondary profile in the main alignment. But, yes, you could
do it your way, or figure the alignment (or feature line) manually as was
done.

--
----
Sorry, nothing snappy here to say.
wrote in message news:5343938@discussion.autodesk.com...
Why don't you just create a feature line where you want the 1% flowline then
grade off of that to the surface.
Message 6 of 6
Civil3DReminders_com
in reply to: Anonymous

Use the LinkSlopeToElevation in your Assembly for the downslope of your ditch. In the corridors make the target profile for the subassembly the flowline. It should work.
Civil Reminders
http://blog.civil3dreminders.com/
http://www.CivilReminders.com/
Alumni

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