Hello Everyone,
I just want to start by saying I have been extremely impressed with the speed and effectiveness of finding Civil 3D solutions through this forum. However I do not think there is a way to solve the problem below without making a custom sub assembly.
There is a common problem that I run into when modelling earthworks on airfields. All Taxiways and Runways will have sepirate areas that determine the slope of earthworks in that area. As an example I will explain my problem for a Runway.
Any ruwnay will have a Strip area (150m offset from its centreline) and a Clear and Graded area (105m offset from its centreline). Therefore any earthwork slopes between the runway pavement edge and 105m offset from the centreline will be determined by the requirements within the Clear and Graded Area. Likewise any earthwork slopes between 105m and 150m offsets from the centreline will be determined by the requirements of the Strip area.
My problem is that when overlaying a runway, the new earthworks required may extend beyond the clear and graded area (and into the strip) at some points but not in others.
Therefore I would like a sub assembly that does earthworks at a set slope unless it passes the clear and graded line where it would then continue the earthworks using a different slope. It should be pointed out that the clear and graded line will be present along the entire length of the runway and the earthworks may or may not extend beyond it.
Just for the sake of clarity, when I say earthworks, I mean the subassembly within autocad that will "Cut or Fill" at a set slope until it reaches a chosen surface level. Similarly the "clear and graded line" and "strip line" are 2D and mearly delineate the areas in plan.
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So that is my problem and a solution to it would help me save time and make my model more dynamic. As it stands I have been getting around this problem by modelling the earthworks at the initial slope (clear and graded area) and then manually amending the corridor to use a different assembly where the earthworks extend beyond the clear and graded line.
Thank you in advance for any time and consideration you spend on helping me out with this problem and I look forward to hearing about any solutions that you have!
Many thanks and Good Luck!
Ross
You could use conditional Cut/Fill assemblies to test whether you would be at a cut or fill at the Clear and Graded offset, at the 1% projection.
Then have the two subassembly scenarios branches to choose from, straight 1% daylight if in cut at the test point, or the 1% with the 2% break if in fill at the test point.
In theory there would be no cut or fill at that point because the earthworks tie in before it reaches there.
You are executing a 1% projection all the way out to the Clear and Graded offset, and testing if that is above or below ground.
Apologies for the lack of clarity in my sketch.
Section A-A is to show the earthworks projecting out at 1% until it reaches the existing ground which in this case happens to be before the clear and graded offest.
Section B-B is to be the situation when that 1% projection takes the earthworks upto and beyond the clear and graded offset.
Apologies for the lack of clarity in my sketch.
None needed. It very clearly poses the problem.
Would your solution function in both situations or would I need sepirate assemblies?
You would need to apply the opposite logic to the 1% projection test at the Clear and Grade offset.
You still need only one assembly. you would add a Conditonal, upstream, at the end of the Overlay for proper branching.
It would tie in at 1% (if you want 1% in cut also), and you would have cut material as defined for the area below EG and above FG.
Yes, if you are also possibly considering subcontracting with Ernst, I would definitely be interested in this work.