Corridor - Offset to surface

1

All,

Is it possible to set an offset and have it daylight at a surface? For example, I want a corridor instruction to be 2’ and I want the elevation to be the existing ground surface elevation. I have used side slope to attach to a surface if I know the slope, but what if I don’t care about the slope?

Thanks,

Dave

2

The only way I know is a roundabout way.

You need to create a node that is 2’ offset and at the elevation of existing ground.

  1. Add Existing Ground surface as reference surface in the corridor
  2. Create a 2’ horizontal offset using any instruction from the Node in your question; elevation does not matter (do not select any material layers)
  3. Create a surface instruction with Left Limit at 0 offset and Right limit at Node to Node with First node at CL and Second Node at Node created in Step 2 (No materials selected here either) using the Existing Ground surface.
  4. Connect From the Node in your question to the Right node created in step 3
3

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4

I have never really dabbled with the surface instructions, so I am not sure exactly what I did, but this absolutely created the results I was looking for. Thank you for your help. I will likely try to find more information on the surface instructions.

5

Are you able to just draw a line 2’ or wherever you want the daylight to? Then you can use the Change Elevation command to use surface elevation.

6

Use an Offset/Slope out 2’ at 0%, then Side Slope with ‘up’ or ‘down’ to create a node on the surface, but don’t select a material - this way it’s a node in space at the surface elevation, but not part of a design surface. Then use Connect instruction to connect the dots with a variable slope.

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7

This has been my way of doing it. I just felt there might be a better way.

8

Just trying to think….Some way to use the merge or combine surface maybe be another way. Still need that 2’ gap between them to join.

OR. use the Create Surface Edge BreakLine to create a quick perimeter of the corridor surface and then offset that line 2’ and elevate to daylight.