Riddle me this, riddle me that: How’d you get it to look like that?

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How laser survey solved a geometric nightmare.


What do you call a project involving a steam chamber, a web of structural steel, confined spaces, and zero time? Some might say that’s a nightmare; we call it an opportunity to implement new solutions.

Luckett & Farley’s structural engineers were approached by its “raw-materials-producer” client to assist with installing new platforms and ladders for maintenance workers to better access equipment within a large steam chamber. The catch: there’s no opportunity for the contractor to verify and measure existing conditions or obstructions – and there are a lot of them! Additionally, how can we provide a design that works without running into conflicts in the field? How can we get a contractor to bid from realistic drawings that convey all of the constraints and scope of the project, to avoid paying premiums for  ”ambiguity” ?

Laser technology & 3D modeling

Our client quickly jumped on the idea of performing a “reality capture” survey (i.e. 3D laser scan) that Luckett & Farley could use  to constuct a Building Information Model (BIM) for the project. A series of scans in and around the chamber, by our consultant, helped generate millions and millions of data points. The collective of points creates a Point Cloud file, which Revit 2013 recognizes and can be sliced, diced, and manipulated to see what is happening in the chamber. Below is a series of photos showing the design progression from “the cloud” to construction documents.

A series of 3D laser scans creates a ghostly blob that is, “the Point Cloud”
The existing conditions
Point Cloud used to create demolition drawings
Final product: new platform configuration model
Construction documents

The Revit model generated from the scanning and modeling process has now been used on two additional projects. Our client regularly hangs 30″x42″ renderings on the wall for reference in conversation (I think they do it because it looks cool). Watch for future blog updates describing the reality capture and modeling process…

Hope you get a kick out of it, just as much we did modeling it.

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About The Author

Greg Buccola, SE, LEED AP BD+C

Greg Buccola, SE, LEED AP BD+C

Greg is a licensed structural engineer with Luckett & Farley, having recently relocated from Los Angeles, where he worked for a nationwide structural engineering firm. He holds a master's degree (MSCE) from UCLA with an emphasis in earthquake engineering and has worked with numerous architects on the West Coast.



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  • Chris Flynn

    What was the cost of the capture process as a % of the overall cost of the project? What was the anticipated cost of the traditional data capture technique (tape measure & sketches), maybe also as a % V’s what was finally done. This would help sell this technique to the bean counters.

    • Greg Buccola

      Chris,

      A great point, which certainly appealed to our client…The cost of the laser survey was 2 men, for 1.5 days and 0.5 days of data post-processing, so you can do the math at typical hourly rates. They were able to capture much more data with the scan than 2 people using “traditional survey” methods could have EVER captured in the same amount of time, nevermind factoring in precision. Particularly given all of the confined spaces, number of pipes, machinery, etc. present in the space.

      The cost of modeling the existing components once the point cloud was imported, was about 3-4 days of work for our engineer (she is also awesome at using Revit) to create. At the end of the day, they have a living snapshot of the structure that was a bargain to ascertain, that can be used on any future projects they might have.

      Thanks for the note and all the best,
      Greg

  • Guest

    Late to see this. That’s a really nice translation from cloud to geometry. I’ve found that its really challenging with scans to decide what level of abstraction to draw to. You always know the laser scan is going to have a lot more info, but when nothing is a straight line, how do you know when to cut out data?

    • Greg Buccola

      Thanks for commenting–it’s important to note that the modeling process (i.e. transforming points into intelligent objects) is done with the help of field photographs, 360 deg. photographs taken during each scan, as-built construction documents, and multiple section cuts/view of the component being modeled. Modeling without the aid of these tools would be very difficult and runs the risk of the model not being accurate.

      Even more important, is knowing what the PURPOSE of the model is, and what it IS NOT required. The project shown here, for example, we modeled only steel and piping that was appurtenant and relevant to the new platforms being constructed—everything else is “noise” and should be mentally filtered.

      Having the proper tools and knowledge of how the model will be used, will help to focus and expedite the process of constructing your model.