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Change the way we design roads

Change the way we design roads

I think that its time to change the way that we design roads.
The way of applying a typical cross section has many limitations.
I thing that the feature is to use components witch will controlled by horizontal and vertical alignments.
Road islands, Bridges , box culvers, Walls, Tunnels require more than the cross section way of design.
Infraworks 360 go in this way.
The profile design must drawing in a separate window. Its not a part of the model just a control of the model. The same with superelevation design and cross section views.
All the components will be solid with full mass properties and with interference check option.


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Hello nikoue, I can subscribe your post. We use AutoCAD Civil 3D for road projects and terrainmodeling in Rotterdam. To build an urban road with T- and X-junctions with the junctiontool is a big puzzle. The urban roads and sqaures in Rotterdam are a complex network with a different variety of sidewalks, bikelanes, flowerbeds, tram networks and waterplaces. All these 'urban objects' are build from a large range of materials. Also the roads and squares are build up from many materials. All the widths of the roads are changing at many points. The 2D and 3D targets are perfect to solve this problem. Another big problem is the variety in subassemblies that we need to build an urban road. It's hard work and a big puzzle to build a model, based on subassemblies with all the pave-, base- and subbase layers. Also its impossible to build an urban road model with only subassemblies. This 'cross section method' failed inside the city. Use Google maps and streetview to view the roads and sqaures in Rotterdam (or other cities!). At this time we build in Civil 3D a 'reference crossfall model'. In this model we use very simple subassemblies (only the 'top layer'). For the crossfalls we use the Superelevation option, in place directly under the profiles. So we build up a corridor with all the alignments, assemblies and subassemblies an a 'reference model surface, used in de profiles and sections. All the 3D lines that we need from the Digital Terrain Model come as breaklines into the reference model surface. So that we can check the new road heights. Water must be getting off over the sidewalk before the (old) houses to the drainage network. The next step is to build a corridor with the curbstones. This will be draped over the reference surface and so we create a full road design. For the height measurement drawings we used fully dynamic 'Rotterdam styled' height labels. Also the Civil 3D model can be used on the construction site. I think over a new feature line, the 'feature data line'. This line can be a 2D or 3D featureline, dynamically follows a linkpoint inside the subassembly (eg. pointcode 'datapoint'). Is the feature data line open, it uses projectdata as m1. Is the feature data line closed, it uses projectdata as m2. Several types of (project)data can be joined to this feature (eg. material, depth of material, manufacuter of this material, the base- and sublayers as data, the material's price etc). We need no longer complex subassemblies but data to build a cross section or profile. The 3D model becomes lighter in file size and using data makes BIM easier in the overall proces. (Design and Build).
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Below you'll see a (new) part of the Rochussenstraat in the center of Rotterdam, near the Erasmus Medical Center. The corridor is build up of several road- and bikelane alignments, a 'light set' of assemblies and subassemblies. The corridor contains the 'reference crossfall model'. A 3D model from subway station Dijkzigt (with a new entrance in front of the highschool) is used in this drawing and projected in the profiles and sections. This Civil 3D model uses many 2D and 3D targets (very powerfull for city projects!) and Superelevation plus breaklines from the Digital Terrain Model.



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