There is a common misconception that BIM means 3D design. In fact, it's much more. BIM is a process for creating and managing all of the information on a project - before, during and after construction. The output of this process is the Building Information Model, the digital description of every aspect of the built asset.
No matter which delivery approach is chosen, the general contractor or the construction manager can use BIM. Construction managers or general contractors can use BIM to extract quantities of work to prepare cost estimates. Furthermore, they can provide powerful 3D renderings. Moreover, schedule integrated BIM known as 4D BIM can be used for animations, safety analysis, and to prepare site logistic plans. Construction managers can use BIM to coordinate work with subcontractors. They can also update schedule and costs with BIM. Lastly, they can turn over an as-built building information model to the owner's maintenance team.
Clash detection Benefits are obvious, you have the ability to see potential issues prior to them becoming real issues. There is literally hundreds of documents on line detailing the benefits of clash detection, below is an example found in an auto desk white paper.
Founded in 1873, the Gilbane Building Company (Gilbane) is the 19th largest contractor and the 6th largest construction manager in the United States,
Compared to traditionally managed construction, BIM projects generate 50 to 70 percent fewer RFIs, which also means fewer change orders," he reports. "We've shortened project schedules by as much as 10 percent. And the cost impact is just as dramatic. On the financial institution project alone, we esti- mate that the client saved more than $1 million. At every stage of the construction process, BIM helps us improve the way we manage projects and deliver value to clients.
Safety analysis, site logistic planning and construction sequencing for complex construction projects that require the site to be operational through the construction period, this if prevent through hospital refurbishments.
When the Superintendent walks the jobsite, s/he can mark the percent complete of all the tasks on the "control chart." With these charts, the on-site team can quickly adjust to real-world conditions. When crew progress fluctuates, it is very easy to see the slope of the line tilting to the left (too slow) or to the right (too fast). If the on-site team does not address this change of pace, it is very easy to track where a collision will occur. Two crews in the same location is a pile-up that can be avoided well in advance with flowline simply by adjusting the crew size and make sure that crews can work unimpeded in unique locations.
Now the onsite team has the information they need to adjust the variables to keep the project on schedule. The team has the Baseline Schedule (the plan); the Actual (from data collected in the Control Chart); and the New Forecast (the look-ahead schedule recalculated from the baseline and the actual). This constant updating alerts the team to any possible conflicts and keeps everyone focused on milestones and due dates.
BIM can assist on any construction site with just utilising these three process you will be able to control most situations on a project allowing you to move from crisis management to managing a potential crisis. About the thing you won't be able to control is the weather.
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John Coglan
15 March 2016
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