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high wages Case studies have shown that early subcontractor involvement in design allows the construction knowledge to be included in the design process4 With VDC tools, this knowledge can be captured in a virtual 3D model With all that being said, experience has proved that using VDC tools in a collaborative coordination effort up front allows a team to gain greater value during construction The Camino MOB project reported an ROI of 2 to 3 times the original investment in VDC within 6 to 9 months Savings accrued through greater prefabrication, elimination of conflicts among the various systems, reduction in change orders, and an increase in productivity of installation without crews struggling with other trades for the same space to install their components The ROI is therefore accrued from the time design is completed to the time all rough-in activities for the MEP/FP systems are completed The owner, as the stakeholder with the money and final risk as well as the expectation of gaining the greatest value, must be willing to make the initial investment As the investor, the owner should make sure that the construction contracts allow for the recapture of the cost of work savings to provide ROI For example, the contracts for all the MEP/FP subcontractors were guaranteed maximum price (GMP) contracts on one of the projects The team used VDC tools to eliminate the risk of missed coordination and was able to achieve higher productivity Subcontractors also were able to return the savings to the owner s incentive sharing plan On projects using VDC in a collaborative effort, the owner should gain the benefit of anticipated higher productivity when the project GMP is set On the health care project for Sutter Health, the approach of GMP with shared savings and an incentive plan worked; however, there are other approaches, such as partnering and self-assembled teams, that could also work just as effectively Role of the General Contractor and Specialty Contractors in the Coordination Process The use of VDC tools requires the team to evaluate what role each member should play in the project delivery process Each party brings a unique skill set to the table, and the use of VDC tools maximizes the benefits The following are the roles that each party can play in the coordination process General Contractor The GC enables the VDC process by acting as facilitator rather than author of the drawings The GC enables and coordinates the handoff of information from the architects and engineers (A/Es) to the subcontractors as well as the modeling and coordination work itself The GC s role in initial modeling and coordination is much the same as that on the project as a whole: to develop a workable detailing schedule together with the A/Es and subcontractors to support the construction schedule Once the schedule is established, the GC s project engineer assigned to MEP coordination works together with the detailers to achieve signoff milestones using the Last Planner System1
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Specialty Contractor The specialty contractors are responsible for modeling their portion of work using 3D tools On the Camino MOB project that used the VDC tools for MEP coordination, the HVAC contractor took a lead role in the coordination process The HVAC equipment, including VAV boxes, fire smoke dampers, duct shafts, and lowand medium-pressure ducts, takes up the most space in the above-ceiling space, and the detailers of other trades (plumbing, electrical, and fire sprinklers) would much rather know in advance how the HVAC equipment and duct shafts andmain ducts are routed since that has the greatest impact on how they will route their utilities The HVAC contractor, therefore, should model at least the main medium-pressure and low-pressure duct lines and shafts so that other trades can coordinate and route their utilities around these duct lines The specialty contractors are also involved early in the process so they can provide input into the constructability and operations issues to the design team Some contracting methods that allow for early involvement of specialty contractors include the design-assist and design-build contracting methods In both methods, the specialty contractors are brought in early (somewhere between the conceptual and schematic design phases) In the designbuild method, the specialty contractor is also the engineer of record for the MEP systems; in the design-assist method, this responsibility may rest with an independent or third-party engineering and design firm Both models work well for the coordination process Use of 3D MEP/FP Models for Prefabrication Efforts On the Camino MOB project, tremendous benefits of prefabrication have been attributed directly to the use of VDC in the MEP/FP coordination process The HVAC contractor alone saved 33 percent of field labor hours by creating parametric and fully coordinated 3D models and then prefabricating the medium-pressure duct and low-pressure ducts Fully coordinated and clash-free, parametric 3D models of MEP/FP systems are a prerequisite for extensive prefabrication The GC and subcontractors should set up an explicit target for prefabricating assemblies off-site at the beginning of the project This provides a goal to track to and also motivates the entire team to use the VDC tools to create clash-free models of MEP/FP systems The fabrication shops can then use these models for prefabrication, knowing with greater certainty that the assemblies they are putting together will fit in the field What to Model One of the questions that most teams have when starting the 3D modeling effort is, What should we model in 3D This question should be answered by the whole team involved in the 3D coordination effort The goals set out by the team for the coordination effort will play a big role in determining what to model On most projects ME/FP coordination can be divided into two distinct efforts:
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Underground coordination of utilities such as plumbing and electrical Above-ceiling coordination of all the MEP/FP utilities
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If the teams decide to do both underground and above-ceiling coordination using 3D tools, then elements such as foundations and framing are required for the coordination effort
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