AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Valued Contributor
jnjhuz
Posts: 76
Registered: ‎04-03-2013
Message 1 of 6 (191 Views)
Accepted Solution

Raising pipe inverts

191 Views, 5 Replies
01-07-2014 08:48 AM

I'm drawing existing SD pipes and trying to put in rim and inverts of the existing structures. Sometimes it won't let me raise an invert to where it really is. It only let's me raise it so far. It may be a rule but it doesn't seem to be a rule I can change. What can I do?

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dgordon
Posts: 1,472
Registered: ‎12-14-2006
Message 2 of 6 (188 Views)

Re: Raising pipe inverts

01-07-2014 08:50 AM in reply to: jnjhuz
when this happens to us it is a problem with the height of the cover that is part of the structure.
Dan

Civil 3D 2013
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Valued Contributor
jnjhuz
Posts: 76
Registered: ‎04-03-2013
Message 3 of 6 (186 Views)

Re: Raising pipe inverts

01-07-2014 08:54 AM in reply to: dgordon
What can I do? I can 't change the ground.
Distinguished Contributor
areese9779
Posts: 146
Registered: ‎08-25-2004
Message 4 of 6 (179 Views)

Re: Raising pipe inverts

01-07-2014 09:14 AM in reply to: jnjhuz

The issue could be that whatever part you are using won't work in your situation, and you need to select a different part.  For example, a typical manhole with a cone section can only be used to a point, at which point you need to switch to a flat-top.  Perhaps the part you are using has a restriction that is affecting the invert?

 

Andy

Andy Reese
C3D 2014, SP1
Dell Precision T3500, Windows 7 64-bit
Valued Contributor
jnjhuz
Posts: 76
Registered: ‎04-03-2013
Message 5 of 6 (176 Views)

Re: Raising pipe inverts

01-07-2014 09:17 AM in reply to: areese9779
OK. I'll try another part. Thanks.
Contributor
aneal
Posts: 13
Registered: ‎03-01-2012
Message 6 of 6 (81 Views)

Re: Raising pipe inverts

05-20-2014 04:10 AM in reply to: jnjhuz

At first I found this an annoyance, but this is actually good to keep pople cognizant of what is going on.  We ended up creating three types of junction parts - those with riser cones (which work when pipe cover is >4') those with cones for an expansion to oversize pipes, those with a slab top (for minimum cover pipes) and those with a slab for the expansion (oversize pipes with little cover).  Think about it - you can't (shouldn't) be putting a pipe into the conical section, so when you use this kind of part, it will create limitations. 

 

Fact is, we usually have not had to consider this - we just spec the standard.  When working in a congested area, if you go through the steps above it can help you model what structure you need for each situation and verify you have clearance, but if all you need is a structure to spec, constraints are not that tight for the work you do, go for the less  intuitive slab cylindrical or square top structure instead of the cone, and you can get down to minimum cover just below the ground. 

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