The dwg files are also useful to examine accesibility, temporary works methodology and safety aspects in a 3D environment. The faces are much easier to deal with and they reflect the design intent. This is because to get any sort of accuracy with contours they need to be extracted at a very close spacing ( we have had 50mm in the past) and the number of vertices becomes an issue. I suppose this could be likened to a COBIE data exchange.įor the record we are fully aware of what to do with a file of 3D faces (in a dwg format obviously) and if we were supplied with a file of contours we would reject it and ask for the 3D faces. By supplying schedules etc in a usable ( generally not pdf but usually csv) format they can be uploaded to an instrument for setting out purposes. We take the view that once data is in a digital format it will never be retyped to be input into another piece of software. If we get a finished surface and a cad file with the various areas shown with the construction depths we can use a differential TIN method to derive the formation.įurthermore, the model can be uploaded to machine control systems and GPS survey kit to control the earthworks more efficiently. This model would typically be an XML of the finished (or formation) surface because, as you correctly say, the way the model is built up can be challenging for a third party to decipher. If the contract is based on remeasurable quantities then there is little risk for the contractor but most of the projects we undertake are fixed price lump sum with the quantities as our risk hence we require a 3D model. I would guess our companies have never worked together.!!!! What format do you issue civil 3d exports and can they read it ok?Īs a contractor, I'm not sure if I should be offended by this or not. On the few occasions were a contractor has insisted contractually to receive a 3d file I have either provided a data shortcut of a triangulation file, 3d faces or 3d contours and they have been lost in what to do with it.they demand a 3d file but have absolutely no way of reading or understanding it. The civil 3d model will never be issued to a contractor, they would never understand how it is built, the work rounds used etc. Whilst we do a cut & fill analysis to understand how the site is balancing and to try and provide an optimised cost efficient design for the client, this is normally based on a top soil strip versus average formation level, the quantifications are the responsibility of the QS to measure and quantify our design for contractors. That's a very different approach to how we do things, our model is our design tool, not a quantification tool. We take the fundamental approach that our contractual drawings are the pdf files issued. I also don't understand why they also ask for details in dwg. I take the approach of not issuing dwgs to contractors but members of the design team can have them no problem for design co-ordination etc, but these are heavily caveated (not live design files, subject to change etc.).Ĭontractors complain that they need manhole schedules, road long sections, cross sections, setting out co-ordinates etc all for setting out and then they ask for dwgs, its our responsibility as civil engineers to provide all the setting out information and if we do then there should be no need to provide them. Not just model a final surface.Ĭivil 3d / revit is so far away from being able to bring civils into BIM its 10+years away. We will need road constructions to be identifiable as permeable paving etcīefore civil 3d will ever be BIM compliant it needs to fundimetally change how we do things, we need to be able to model every piece of civil infrastructure such as roads, kerbs, manholes, pipes, manhole covers etc. If eventually revit can bring in the civil 3d information such as pipe sizes and flow control references then it still won't be BIM compliant as civil 3d cannot model things such as attenuation tanks.įor civil 3d to be BIM compliant we need for revit or what ever file that will contain all the information to be able to bring in our kerbs identifications, road constructions etc. they should be able to zoom in on a pipe or attenuation tank below a building and see who made it, what the model is, when is maintenance due etcĪs civil 3d information cannot be included within the same file as revit information and still contain this type of information, civil 3d it is not BIM compatible.Īll we can do is export to 3d autocad and bring the surface in as a bad triangulation or the pipes / manholes as a 3d object with no live information The whole aim of BIM is to put all the information into one file for building owners / managers that they can use. Yea i agree its building information modelling, that was me just defining the term.
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