An Overview of Civil 3D Subassemblies 2023


Civil 3D corridors are essentially a section (assembly) that is extruded along a 3D path. This path is composed of the combination of an alignment (XY) and a profile (Z).

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The assembly is composed of elements called subassemblies. It is not only important where to get a hold of the subassemblies, but also some of their composition, as it informs not only assembly instructions, but also how surfaces are created. The surfaces are in turn used to create quantity takeoffs. When you first view the subassemblies on the tool palette, it can be daunting to understand how each one is used. There are multiple tabs, and each tab has various subassemblies that can be used in assemblies. The trick is the right mouse click (RMC) on the subassembly and then to open the help page. I have chosen one of the more complex subassemblies as an example. Many real-world examples of roads are composed of just such multilayer subassemblies.

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You will find a detailed description of how the subassembly is supposed to be used.

Autodesk, Micrographics, Civil 3D 2023, Subassemblies

The coding of the subassembly is important, especially the points and links.

Autodesk, Micrographics, Civil 3D 2023, Subassemblies

I recommend you use the help menu to inspect every available subassembly to understand which ones you need to connect. If you are feeling adventurous, you may even try your hand at the subassembly composer, or just create a subassembly from a polyline. Get to know the subassemblies so that you can build better corridors for transport corridors.

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