B2: Chapter 6 BIM For Contractors

This chapter dives into how building information modeling (BIM) technology can be utilized for contractors both on and off the field. Although BIM has mainly been used for design and engineers it can pose many advantages for construction. It can allow for more coordination between subcontractors and create an Integrated Project Delivery (IPD) when working or bidding for contracts. When the design phase is transferred to the construction phases most of the time information and analysis is lost that can be regained with the use of BIM. Although there is a learning curve from 2D drawings to a 4D building information model, the level of detail is more immense that can resolve everything from more accurately cost estimating to being able to see the construction phases in real time. If the knowledge of how to use BIM technology is there, it can become very beneficial in more accurately assessing cost, planning, fabrication, and clash detection. This chapter goes into detail how it can affect each of these factors.

From large to small contracting companies the value of BIM has started to move from only quantity and material estimates to actual project team collaboration. This can create a relationship between architects where models can be provided earlier to contractors for different procurement and time dependent phases. A computer generated model on site can provide more information on the actual design rather than interpreting 2D CAD drawings. Implementation of this technology poses a challenge in how to approach the construction process with this newfound technology. We can look at some sample integration flow charts below:

Figure 1: Project implementation flow chart using 3D/BIM modeling

In one flow chart we can see the use of BIM modeling for just quantity takeoffs by making a model off a 2D cad model, while in the other the BIM model is used throughout the process. Where architects develop a BIM model and this shared BIM model between clients, consultants, architects, and contractors can facilitate with trade coordination, planning, and visualizations. 

Adding onto the integration of a construction process, BIM can also be beneficial for construction planning and scheduling. While nowadays schedulers find the critical path method of a project using Primavera or P3. Scheduling can now become more detailed with location-based scheduling that can create more detailed schedules. This new form of scheduling also captures the spacial component of different activities. In the future, I believe BIM will have a significant impact on how we schedule to develop more specific schedules. For construction planning, BIM also has a possible impact on planning with the ability to look at snapshots of the project in real time and the ability to predict construction activities. At my last co-op for LF Driscoll I saw the use of BIM modeling used on the new CHOP Schuykill Building where project managers would utilize the 4D model to time when to place pilings and time out other activities properly based on spacial recognition. Usually as also described in the book, in these building models links are attached to different systems so one could look at for instance when the system was installed or when the system is to be installed. This can be very beneficial in error resolution in a large collision of construction activities. 

This chapter gave me much more insight into what exactly BIM can contribute to. I've always thought these instances but the detailed description gave me a bigger picture of how BIM can influence construction projects moving forward.


Response 1: Lauren Kujawa


Lauren, in my post for chapter 6 i didn't emphasize how the learning curve would impact not only the contracting company but also the project in general. I thought it was good point that enough individuals on a site would need to know how to use the model in order for it to be efficient. This could pose problems when trying to explain with all the subcontractors the BIM model in order for a location-based schedule to function.

Response 2: Issac Quelly

Issac, I thought it was interesting to see the analogy you used for contractors-engineers with the education system. Although I agree there is a disconnect I think its also important to understand that with more understanding comes more responsibility and a want for higher pay. This could lead to even more problems, but in the end a team effort between contractors and engineers could boast projects that are immensely efficient and state of the art.

Response 3:

Marino, from your post I was able to gain a good grasp of your chapter dealing with facility managers. With BIM I think a point you made clear was how it could influence the continued performance of building. And that it doesn't have to stop with construction and it can be used by improving equipment and efficiency throughout a building.

Citation:

Eastman, Chuck. BIM Handbook: A Guide to Building Information Modeling for Owners, Managers, Designers, Engineers and Contractors. John Wiley & Sons, 2015.